Bumped version to 0.10.4

Change default data mid

.github/workflows/build-gnutls.yml

@@ -12,11 +12,11 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: install packages
-      run: sudo apt update && sudo apt install libgnutls28-dev nettle-dev
+      run: sudo apt update && sudo apt install libgnutls28-dev nettle-dev libsrtp2-dev
     - name: submodules
       run: git submodule update --init --recursive
     - name: cmake
-      run: cmake -B build -DUSE_GNUTLS=1 -DWARNINGS_AS_ERRORS=1
+      run: cmake -B build -DUSE_GNUTLS=1 -DUSE_SYSTEM_SRTP=1 -DWARNINGS_AS_ERRORS=1
     - name: make
       run: (cd build; make -j2)
     - name: test
@@ -30,7 +30,7 @@ jobs:
     - name: submodules
       run: git submodule update --init --recursive
     - name: cmake
-      run: cmake -B build -DUSE_GNUTLS=1 -DWARNINGS_AS_ERRORS=1
+      run: cmake -B build -DUSE_GNUTLS=1 -DWARNINGS_AS_ERRORS=1 -DENABLE_LOCAL_ADDRESS_TRANSLATION=1
     - name: make
       run: (cd build; make -j2)
     - name: test

.github/workflows/build-nice.yml

@@ -7,7 +7,7 @@ on:
     branches:
     - master
 jobs:
-  build-linux:
+  build-media:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
@@ -21,4 +21,18 @@ jobs:
       run: (cd build; make -j2)
     - name: test
       run: ./build/tests
+  build-no-media:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: install packages
+      run: sudo apt update && sudo apt install libgnutls28-dev libnice-dev
+    - name: submodules
+      run: git submodule update --init --recursive
+    - name: cmake
+      run: cmake -B build -DUSE_GNUTLS=1 -DUSE_NICE=1 -DNO_MEDIA=1 -DWARNINGS_AS_ERRORS=1
+    - name: make
+      run: (cd build; make -j2)
+    - name: test
+      run: ./build/tests
 

.github/workflows/build-openssl.yml

@@ -12,11 +12,11 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: install packages
-      run: sudo apt update && sudo apt install libssl-dev
+      run: sudo apt update && sudo apt install libssl-dev libsrtp2-dev
     - name: submodules
       run: git submodule update --init --recursive
     - name: cmake
-      run: cmake -B build -DUSE_GNUTLS=0 -DWARNINGS_AS_ERRORS=1
+      run: cmake -B build -DUSE_GNUTLS=0 -DUSE_SYSTEM_SRTP=1 -DWARNINGS_AS_ERRORS=1
     - name: make
       run: (cd build; make -j2)
     - name: test
@@ -30,7 +30,7 @@ jobs:
     - name: submodules
       run: git submodule update --init --recursive
     - name: cmake
-      run: cmake -B build -DUSE_GNUTLS=0 -WARNINGS_AS_ERRORS=1
+      run: cmake -B build -DUSE_GNUTLS=0 -WARNINGS_AS_ERRORS=1 -DENABLE_LOCAL_ADDRESS_TRANSLATION=1
       env:
         OPENSSL_ROOT_DIR: /usr/local/opt/openssl
         OPENSSL_LIBRARIES: /usr/local/opt/openssl/lib
@@ -52,6 +52,7 @@ jobs:
     - name: nmake
       run: |
         cd build
+        set CL=/MP
         nmake
     - name: test
       run: build/tests.exe

.gitmodules

@@ -10,3 +10,6 @@
 [submodule "deps/json"]
 	path = deps/json
 	url = https://github.com/nlohmann/json.git
+[submodule "deps/libsrtp"]
+	path = deps/libsrtp
+	url = https://github.com/cisco/libsrtp.git

CMakeLists.txt

@@ -1,16 +1,20 @@
 cmake_minimum_required(VERSION 3.7)
 project(libdatachannel
-	DESCRIPTION "WebRTC Data Channels Library"
-	VERSION 0.9.3
+	VERSION 0.10.4
 	LANGUAGES CXX)
+set(PROJECT_DESCRIPTION "WebRTC Data Channels Library")
 
 # Options
 option(USE_GNUTLS "Use GnuTLS instead of OpenSSL" OFF)
 option(USE_NICE "Use libnice instead of libjuice" OFF)
+option(USE_SYSTEM_SRTP "Use system libSRTP" OFF)
 option(NO_WEBSOCKET "Disable WebSocket support" OFF)
+option(NO_MEDIA "Disable media transport support" OFF)
 option(NO_EXAMPLES "Disable examples" OFF)
 option(NO_TESTS "Disable tests build" OFF)
 option(WARNINGS_AS_ERRORS "Treat warnings as errors" OFF)
+option(RSA_KEY_BITS_2048 "Use 2048-bit RSA key instead of 3072-bit" OFF)
+option(CAPI_STDCALL "Set calling convention of C API callbacks stdcall" OFF)
 
 if(USE_NICE)
 	option(USE_JUICE "Use libjuice" OFF)
@@ -19,9 +23,12 @@ else()
 endif()
 
 if(USE_GNUTLS)
-	option(USE_NETTLE "Use Nettle instead of OpenSSL in libjuice" ON)
+	option(USE_NETTLE "Use Nettle in libjuice" ON)
 else()
-	option(USE_NETTLE "Use Nettle instead of OpenSSL in libjuice" OFF)
+	option(USE_NETTLE "Use Nettle in libjuice" OFF)
+	if(NOT USE_SYSTEM_SRTP)
+		option(ENABLE_OPENSSL "Enable OpenSSL crypto engine for SRTP" ON)
+	endif()
 endif()
 
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
@@ -29,7 +36,7 @@ set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/Modules)
 
 if(WIN32)
 	add_definitions(-DWIN32_LEAN_AND_MEAN)
-	if (MSVC)
+	if(MSVC)
 		add_definitions(-DNOMINMAX)
 		add_definitions(-D_CRT_SECURE_NO_WARNINGS)
 		add_definitions(-D_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING)
@@ -85,6 +92,7 @@ set(LIBDATACHANNEL_HEADERS
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/reliability.hpp
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/rtc.h
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/rtc.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/rtp.hpp
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/track.hpp
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/websocket.hpp
 )
@@ -107,17 +115,15 @@ set(CMAKE_POLICY_DEFAULT_CMP0048 NEW)
 add_subdirectory(deps/plog)
 
 option(sctp_build_programs 0)
+option(sctp_build_shared_lib 0)
 add_subdirectory(deps/usrsctp EXCLUDE_FROM_ALL)
 if (MSYS OR MINGW)
 	target_compile_definitions(usrsctp PUBLIC -DSCTP_STDINT_INCLUDE=<stdint.h>)
-	target_compile_definitions(usrsctp-static PUBLIC -DSCTP_STDINT_INCLUDE=<stdint.h>)
 endif()
 if (CMAKE_CXX_COMPILER_ID MATCHES "GNU")
     target_compile_options(usrsctp PRIVATE -Wno-error=format-truncation)
-	target_compile_options(usrsctp-static PRIVATE -Wno-error=format-truncation)
 endif()
 add_library(Usrsctp::Usrsctp ALIAS usrsctp)
-add_library(Usrsctp::UsrsctpStatic ALIAS usrsctp-static)
 
 if (NO_WEBSOCKET)
 	add_library(datachannel SHARED
@@ -148,37 +154,45 @@ target_include_directories(datachannel PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/includ
 target_include_directories(datachannel PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include/rtc)
 target_include_directories(datachannel PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
 target_link_libraries(datachannel PUBLIC Threads::Threads plog::plog)
-target_link_libraries(datachannel PRIVATE Usrsctp::UsrsctpStatic)
+target_link_libraries(datachannel PRIVATE Usrsctp::Usrsctp)
 
 target_include_directories(datachannel-static PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
 target_include_directories(datachannel-static PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include/rtc)
 target_include_directories(datachannel-static PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
 target_link_libraries(datachannel-static PUBLIC Threads::Threads plog::plog)
-target_link_libraries(datachannel-static PRIVATE Usrsctp::UsrsctpStatic)
+target_link_libraries(datachannel-static PRIVATE Usrsctp::Usrsctp)
 
 if(WIN32)
-	target_link_libraries(datachannel PRIVATE wsock32 ws2_32) # winsock2
-	target_link_libraries(datachannel-static PRIVATE wsock32 ws2_32) # winsock2
+	target_link_libraries(datachannel PUBLIC ws2_32) # winsock2
+	target_link_libraries(datachannel-static PUBLIC ws2_32) # winsock2
 endif()
 
-find_package(SRTP)
-if(SRTP_FOUND)
-	if(NOT TARGET SRTP::SRTP)
-		add_library(SRTP::SRTP UNKNOWN IMPORTED)
-		set_target_properties(SRTP::SRTP PROPERTIES
-			INTERFACE_INCLUDE_DIRECTORIES ${SRTP_INCLUDE_DIRS}
-			IMPORTED_LINK_INTERFACE_LANGUAGES C
-			IMPORTED_LOCATION ${SRTP_LIBRARIES})
-	endif()
-	message(STATUS "LibSRTP found, compiling with media transport")
-	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_MEDIA=1)
-	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_MEDIA=1)
-	target_link_libraries(datachannel PRIVATE SRTP::SRTP)
-	target_link_libraries(datachannel-static PRIVATE SRTP::SRTP)
-else()
-	message(STATUS "LibSRTP NOT found, compiling WITHOUT media transport")
+if(NO_MEDIA)
 	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_MEDIA=0)
 	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_MEDIA=0)
+else()
+	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_MEDIA=1)
+	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_MEDIA=1)
+	if(USE_SYSTEM_SRTP)
+		find_package(SRTP REQUIRED)
+		if(NOT TARGET SRTP::SRTP)
+			add_library(SRTP::SRTP UNKNOWN IMPORTED)
+			set_target_properties(SRTP::SRTP PROPERTIES
+				INTERFACE_INCLUDE_DIRECTORIES ${SRTP_INCLUDE_DIRS}
+				IMPORTED_LINK_INTERFACE_LANGUAGES C
+				IMPORTED_LOCATION ${SRTP_LIBRARIES})
+		endif()
+		target_compile_definitions(datachannel PRIVATE RTC_SYSTEM_SRTP=1)
+		target_compile_definitions(datachannel-static PRIVATE RTC_SYSTEM_SRTP=1)
+		target_link_libraries(datachannel PRIVATE SRTP::SRTP)
+		target_link_libraries(datachannel-static PRIVATE SRTP::SRTP)
+	else()
+		add_subdirectory(deps/libsrtp EXCLUDE_FROM_ALL)
+		target_compile_definitions(datachannel PRIVATE RTC_SYSTEM_SRTP=0)
+		target_compile_definitions(datachannel-static PRIVATE RTC_SYSTEM_SRTP=0)
+		target_link_libraries(datachannel PRIVATE srtp2)
+		target_link_libraries(datachannel-static PRIVATE srtp2)
+	endif()
 endif()
 
 if (USE_GNUTLS)
@@ -217,6 +231,16 @@ else()
 	target_link_libraries(datachannel-static PRIVATE LibJuice::LibJuiceStatic)
 endif()
 
+if(RSA_KEY_BITS_2048)
+	target_compile_definitions(datachannel PUBLIC RSA_KEY_BITS_2048)
+	target_compile_definitions(datachannel-static PUBLIC RSA_KEY_BITS_2048)
+endif()
+
+if(CAPI_STDCALL)
+	target_compile_definitions(datachannel PUBLIC CAPI_STDCALL)
+	target_compile_definitions(datachannel-static PUBLIC CAPI_STDCALL)
+endif()
+
 add_library(LibDataChannel::LibDataChannel ALIAS datachannel)
 add_library(LibDataChannel::LibDataChannelStatic ALIAS datachannel-static)
 
@@ -244,35 +268,32 @@ if(NOT NO_TESTS)
 	set_target_properties(datachannel-tests PROPERTIES
 		VERSION ${PROJECT_VERSION}
 		CXX_STANDARD 17)
-	set_target_properties(datachannel-tests PROPERTIES OUTPUT_NAME tests)
-	target_include_directories(datachannel-tests PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
-	if(WIN32)
-		target_link_libraries(datachannel-tests datachannel-static) # DLL exports only the C API
-	else()
-		target_link_libraries(datachannel-tests datachannel)
+	if(NOT CMAKE_SYSTEM_NAME STREQUAL "WindowsStore") # Prevent a bug in manifest generation for UWP
+		set_target_properties(datachannel-tests PROPERTIES OUTPUT_NAME tests)
 	endif()
+	target_include_directories(datachannel-tests PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
+	target_link_libraries(datachannel-tests datachannel)
 
 	# Benchmark
 	add_executable(datachannel-benchmark test/benchmark.cpp)
 	set_target_properties(datachannel-benchmark PROPERTIES
 		VERSION ${PROJECT_VERSION}
 		CXX_STANDARD 17)
-	set_target_properties(datachannel-benchmark PROPERTIES OUTPUT_NAME benchmark)
+	if(NOT CMAKE_SYSTEM_NAME STREQUAL "WindowsStore") # Prevent a bug in manifest generation for UWP
+		set_target_properties(datachannel-benchmark PROPERTIES OUTPUT_NAME benchmark)
+	endif()
 	target_compile_definitions(datachannel-benchmark PRIVATE BENCHMARK_MAIN=1)
 	target_include_directories(datachannel-benchmark PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
-	if(WIN32)
-		target_link_libraries(datachannel-benchmark datachannel-static) # DLL exports only the C API
-	else()
-		target_link_libraries(datachannel-benchmark datachannel)
-	endif()
+	target_link_libraries(datachannel-benchmark datachannel)
 endif()
 
 # Examples
-if(NOT NO_EXAMPLES)
+if(NOT NO_EXAMPLES AND NOT CMAKE_SYSTEM_NAME STREQUAL "WindowsStore")
 	set(JSON_BuildTests OFF CACHE INTERNAL "")
 	add_subdirectory(deps/json)
 	add_subdirectory(examples/client)
 	add_subdirectory(examples/media)
+	add_subdirectory(examples/sfu-media)
 	add_subdirectory(examples/copy-paste)
 	add_subdirectory(examples/copy-paste-capi)
 endif()

README.md

@@ -19,7 +19,7 @@ The WebRTC stack has been tested to be compatible with Firefox and Chromium.
 
 Protocol stack:
 - SCTP-based Data Channels ([draft-ietf-rtcweb-data-channel-13](https://tools.ietf.org/html/draft-ietf-rtcweb-data-channel-13))
-- SRTP-based Media Transport ([draft-ietf-rtcweb-rtp-usage-26](https://tools.ietf.org/html/draft-ietf-rtcweb-rtp-usage-26)) with [libSRTP](https://github.com/cisco/libsrtp)
+- SRTP-based Media Transport ([draft-ietf-rtcweb-rtp-usage-26](https://tools.ietf.org/html/draft-ietf-rtcweb-rtp-usage-26))
 - DTLS/UDP ([RFC7350](https://tools.ietf.org/html/rfc7350) and [RFC8261](https://tools.ietf.org/html/rfc8261))
 - ICE ([RFC8445](https://tools.ietf.org/html/rfc8445)) with STUN ([RFC5389](https://tools.ietf.org/html/rfc5389))
 
@@ -27,8 +27,9 @@ Features:
 - Full IPv6 support
 - Trickle ICE ([draft-ietf-ice-trickle-21](https://tools.ietf.org/html/draft-ietf-ice-trickle-21))
 - JSEP compatible ([draft-ietf-rtcweb-jsep-26](https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-26))
-- SRTP and SRTCP key derivation from DTLS ([RFC5764](https://tools.ietf.org/html/rfc5764))
 - Multicast DNS candidates ([draft-ietf-rtcweb-mdns-ice-candidates-04](https://tools.ietf.org/html/draft-ietf-rtcweb-mdns-ice-candidates-04))
+- SRTP and SRTCP key derivation from DTLS ([RFC5764](https://tools.ietf.org/html/rfc5764))
+- Differentiated Services QoS ([draft-ietf-tsvwg-rtcweb-qos-18](https://tools.ietf.org/html/draft-ietf-tsvwg-rtcweb-qos-18))
 - TURN relaying ([RFC5766](https://tools.ietf.org/html/rfc5766)) with [libnice](https://github.com/libnice/libnice) as ICE backend
 
 Note only SDP BUNDLE mode is supported for media multiplexing ([draft-ietf-mmusic-sdp-bundle-negotiation-54](https://tools.ietf.org/html/draft-ietf-mmusic-sdp-bundle-negotiation-54)). The behavior is equivalent to the JSEP bundle-only policy: the library always negociates one unique network component, where SRTP media streams are multiplexed with SRTCP control packets ([RFC5761](https://tools.ietf.org/html/rfc5761)) and SCTP/DTLS data traffic ([RFC5764](https://tools.ietf.org/html/rfc5764)).
@@ -53,10 +54,11 @@ Dependencies:
 Submodules:
 - libjuice: https://github.com/paullouisageneau/libjuice
 - usrsctp: https://github.com/sctplab/usrsctp
+- libsrtp: https://github.com/cisco/libsrtp
 
 Optional dependencies:
-- libnice: https://nice.freedesktop.org/ (only if selected as ICE backend instead of libjuice)
-- libSRTP: https://github.com/cisco/libsrtp (only necessary for supporting media transport)
+- libnice: https://nice.freedesktop.org/ (if selected as ICE backend instead of libjuice)
+- libsrtp: https://github.com/cisco/libsrtp (if selected instead of the submodule)
 
 ## Building
 
@@ -81,6 +83,29 @@ $ cd build
 $ make -j2
 ```
 
+#### Apple macOS with XCode project
+
+```bash
+$ cmake -B "$BUILD_DIR" -DUSE_GNUTLS=0 -DUSE_NICE=0 -G Xcode
+```
+
+Xcode project is generated in *build/* directory.
+
+##### Solving **Could NOT find OpenSSL** error
+
+You need to add OpenSSL root directory if your build fails with the following message:
+
+```
+Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the
+system variable OPENSSL_ROOT_DIR (missing: OPENSSL_CRYPTO_LIBRARY
+OPENSSL_INCLUDE_DIR)
+```
+
+for example:
+```bash
+$ cmake -B build -DUSE_GNUTLS=0 -DUSE_NICE=0 -G Xcode -DOPENSSL_ROOT_DIR=/usr/local/Cellar/openssl\@1.1/1.1.1h/
+```
+
 #### Microsoft Windows with MinGW cross-compilation
 ```bash
 $ cmake -B build -DCMAKE_TOOLCHAIN_FILE=/usr/share/mingw/toolchain-x86_64-w64-mingw32.cmake # replace with your toolchain file
@@ -202,5 +227,6 @@ ws->open("wss://my.websocket/service");
 ## External resources
 - Rust wrapper for libdatachannel: [datachannel-rs](https://github.com/lerouxrgd/datachannel-rs)
 - Node.js wrapper for libdatachannel: [node-datachannel](https://github.com/murat-dogan/node-datachannel)
+- Unity wrapper for Windows 10 and Hololens: [datachannel-unity](https://github.com/hanseuljun/datachannel-unity)
 - WebAssembly wrapper compatible with libdatachannel: [datachannel-wasm](https://github.com/paullouisageneau/datachannel-wasm)
 

examples/client/CMakeLists.txt

@@ -9,14 +9,9 @@ target_compile_definitions(datachannel-client PUBLIC STATIC_GETOPT)
 else()
 add_executable(datachannel-client main.cpp parse_cl.cpp parse_cl.h)
 endif()
+
 set_target_properties(datachannel-client PROPERTIES
 	CXX_STANDARD 17
 	OUTPUT_NAME client)
-
-if(WIN32)
-	target_link_libraries(datachannel-client datachannel-static) # DLL exports only the C API
-else()
-	target_link_libraries(datachannel-client datachannel)
-endif()
 target_link_libraries(datachannel-client datachannel nlohmann_json)
 

examples/client/getopt.cpp

@@ -21,6 +21,7 @@ Revisions:
 08/01/2012 - Ludvik Jerabek - Created separate functions for char and wchar_t characters so single dll can do both unicode and ansi
 10/15/2012 - Ludvik Jerabek - Modified to match latest GNU features
 06/19/2015 - Ludvik Jerabek - Fixed maximum option limitation caused by option_a (255) and option_w (65535) structure val variable
+24/10/2020 - Paul-Louis Ageneau - Removed Unicode version
 
 **DISCLAIMER**
 THIS MATERIAL IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
@@ -35,7 +36,11 @@ PROFITS, BUSINESS INTERRUPTION, LOSS OF PROGRAMS OR OTHER DATA ON
 YOUR INFORMATION HANDLING SYSTEM OR OTHERWISE, EVEN If WE ARE
 EXPRESSLY ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 */
+
+#ifndef _CRT_SECURE_NO_WARNINGS
 #define _CRT_SECURE_NO_WARNINGS
+#endif
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <malloc.h>
@@ -52,12 +57,6 @@ int opterr = 1;
 int optopt = '?';
 enum ENUM_ORDERING { REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER };
 
-//
-//
-//		Ansi structures and functions follow
-// 
-//
-
 static struct _getopt_data_a
 {
 	int optind;
@@ -512,462 +511,3 @@ int _getopt_long_only_r_a (int argc, char *const *argv, const char *options, con
 	return _getopt_internal_r_a (argc, argv, options, long_options, opt_index, 1, d, 0);
 }
 
-//
-//
-//	Unicode Structures and Functions
-// 
-//
-
-static struct _getopt_data_w
-{
-	int optind;
-	int opterr;
-	int optopt;
-	wchar_t *optarg;
-	int __initialized;
-	wchar_t *__nextchar;
-	enum ENUM_ORDERING __ordering;
-	int __posixly_correct;
-	int __first_nonopt;
-	int __last_nonopt;
-} getopt_data_w;
-wchar_t *optarg_w;
-
-static void exchange_w(wchar_t **argv, struct _getopt_data_w *d)
-{
-	int bottom = d->__first_nonopt;
-	int middle = d->__last_nonopt;
-	int top = d->optind;
-	wchar_t *tem;
-	while (top > middle && middle > bottom)
-	{
-		if (top - middle > middle - bottom)
-		{
-			int len = middle - bottom;
-			int i;
-			for (i = 0; i < len; i++)
-			{
-				tem = argv[bottom + i];
-				argv[bottom + i] = argv[top - (middle - bottom) + i];
-				argv[top - (middle - bottom) + i] = tem;
-			}
-			top -= len;
-		}
-		else
-		{
-			int len = top - middle;
-			int i;
-			for (i = 0; i < len; i++)
-			{
-				tem = argv[bottom + i];
-				argv[bottom + i] = argv[middle + i];
-				argv[middle + i] = tem;
-			}
-			bottom += len;
-		}
-	}
-	d->__first_nonopt += (d->optind - d->__last_nonopt);
-	d->__last_nonopt = d->optind;
-}
-static const wchar_t *_getopt_initialize_w (const wchar_t *optstring, struct _getopt_data_w *d, int posixly_correct)
-{
-	d->__first_nonopt = d->__last_nonopt = d->optind;
-	d->__nextchar = NULL;
-	d->__posixly_correct = posixly_correct | !!_wgetenv(L"POSIXLY_CORRECT");
-	if (optstring[0] == L'-')
-	{
-		d->__ordering = RETURN_IN_ORDER;
-		++optstring;
-	}
-	else if (optstring[0] == L'+')
-	{
-		d->__ordering = REQUIRE_ORDER;
-		++optstring;
-	}
-	else if (d->__posixly_correct)
-		d->__ordering = REQUIRE_ORDER;
-	else
-		d->__ordering = PERMUTE;
-	return optstring;
-}
-int _getopt_internal_r_w (int argc, wchar_t *const *argv, const wchar_t *optstring, const struct option_w *longopts, int *longind, int long_only, struct _getopt_data_w *d, int posixly_correct)
-{
-	int print_errors = d->opterr;
-	if (argc < 1)
-		return -1;
-	d->optarg = NULL;
-	if (d->optind == 0 || !d->__initialized)
-	{
-		if (d->optind == 0)
-			d->optind = 1;
-		optstring = _getopt_initialize_w (optstring, d, posixly_correct);
-		d->__initialized = 1;
-	}
-	else if (optstring[0] == L'-' || optstring[0] == L'+')
-		optstring++;
-	if (optstring[0] == L':')
-		print_errors = 0;
-	if (d->__nextchar == NULL || *d->__nextchar == L'\0')
-	{
-		if (d->__last_nonopt > d->optind)
-			d->__last_nonopt = d->optind;
-		if (d->__first_nonopt > d->optind)
-			d->__first_nonopt = d->optind;
-		if (d->__ordering == PERMUTE)
-		{
-			if (d->__first_nonopt != d->__last_nonopt && d->__last_nonopt != d->optind)
-				exchange_w((wchar_t **) argv, d);
-			else if (d->__last_nonopt != d->optind)
-				d->__first_nonopt = d->optind;
-			while (d->optind < argc && (argv[d->optind][0] != L'-' || argv[d->optind][1] == L'\0'))
-				d->optind++;
-			d->__last_nonopt = d->optind;
-		}
-		if (d->optind != argc && !wcscmp(argv[d->optind], L"--"))
-		{
-			d->optind++;
-			if (d->__first_nonopt != d->__last_nonopt && d->__last_nonopt != d->optind)
-				exchange_w((wchar_t **) argv, d);
-			else if (d->__first_nonopt == d->__last_nonopt)
-				d->__first_nonopt = d->optind;
-			d->__last_nonopt = argc;
-			d->optind = argc;
-		}
-		if (d->optind == argc)
-		{
-			if (d->__first_nonopt != d->__last_nonopt)
-				d->optind = d->__first_nonopt;
-			return -1;
-		}
-		if ((argv[d->optind][0] != L'-' || argv[d->optind][1] == L'\0'))
-		{
-			if (d->__ordering == REQUIRE_ORDER)
-				return -1;
-			d->optarg = argv[d->optind++];
-			return 1;
-		}
-		d->__nextchar = (argv[d->optind] + 1 + (longopts != NULL && argv[d->optind][1] == L'-'));
-	}
-	if (longopts != NULL && (argv[d->optind][1] == L'-' || (long_only && (argv[d->optind][2] || !wcschr(optstring, argv[d->optind][1])))))
-	{
-		wchar_t *nameend;
-		unsigned int namelen;
-		const struct option_w *p;
-		const struct option_w *pfound = NULL;
-		struct option_list
-		{
-			const struct option_w *p;
-			struct option_list *next;
-		} *ambig_list = NULL;
-		int exact = 0;
-		int indfound = -1;
-		int option_index;
-		for (nameend = d->__nextchar; *nameend && *nameend != L'='; nameend++);
-		namelen = (unsigned int)(nameend - d->__nextchar);
-		for (p = longopts, option_index = 0; p->name; p++, option_index++)
-			if (!wcsncmp(p->name, d->__nextchar, namelen))
-			{
-				if (namelen == (unsigned int)wcslen(p->name))
-				{
-					pfound = p;
-					indfound = option_index;
-					exact = 1;
-					break;
-				}
-				else if (pfound == NULL)
-				{
-					pfound = p;
-					indfound = option_index;
-				}
-				else if (long_only || pfound->has_arg != p->has_arg || pfound->flag != p->flag || pfound->val != p->val)
-				{
-					struct option_list *newp = (struct option_list*)alloca(sizeof(*newp));
-					newp->p = p;
-					newp->next = ambig_list;
-					ambig_list = newp;
-				}
-			}
-			if (ambig_list != NULL && !exact)
-			{
-				if (print_errors)
-				{						
-					struct option_list first;
-					first.p = pfound;
-					first.next = ambig_list;
-					ambig_list = &first;
-					fwprintf(stderr, L"%s: option '%s' is ambiguous; possibilities:", argv[0], argv[d->optind]);
-					do
-					{
-						fwprintf (stderr, L" '--%s'", ambig_list->p->name);
-						ambig_list = ambig_list->next;
-					}
-					while (ambig_list != NULL);
-					fputwc (L'\n', stderr);
-				}
-				d->__nextchar += wcslen(d->__nextchar);
-				d->optind++;
-				d->optopt = 0;
-				return L'?';
-			}
-			if (pfound != NULL)
-			{
-				option_index = indfound;
-				d->optind++;
-				if (*nameend)
-				{
-					if (pfound->has_arg)
-						d->optarg = nameend + 1;
-					else
-					{
-						if (print_errors)
-						{
-							if (argv[d->optind - 1][1] == L'-')
-							{
-								fwprintf(stderr, L"%s: option '--%s' doesn't allow an argument\n",argv[0], pfound->name);
-							}
-							else
-							{
-								fwprintf(stderr, L"%s: option '%c%s' doesn't allow an argument\n",argv[0], argv[d->optind - 1][0],pfound->name);
-							}
-						}
-						d->__nextchar += wcslen(d->__nextchar);
-						d->optopt = pfound->val;
-						return L'?';
-					}
-				}
-				else if (pfound->has_arg == 1)
-				{
-					if (d->optind < argc)
-						d->optarg = argv[d->optind++];
-					else
-					{
-						if (print_errors)
-						{
-							fwprintf(stderr,L"%s: option '--%s' requires an argument\n",argv[0], pfound->name);
-						}
-						d->__nextchar += wcslen(d->__nextchar);
-						d->optopt = pfound->val;
-						return optstring[0] == L':' ? L':' : L'?';
-					}
-				}
-				d->__nextchar += wcslen(d->__nextchar);
-				if (longind != NULL)
-					*longind = option_index;
-				if (pfound->flag)
-				{
-					*(pfound->flag) = pfound->val;
-					return 0;
-				}
-				return pfound->val;
-			}
-			if (!long_only || argv[d->optind][1] == L'-' || wcschr(optstring, *d->__nextchar) == NULL)
-			{
-				if (print_errors)
-				{
-					if (argv[d->optind][1] == L'-')
-					{
-						fwprintf(stderr, L"%s: unrecognized option '--%s'\n",argv[0], d->__nextchar);
-					}
-					else
-					{
-						fwprintf(stderr, L"%s: unrecognized option '%c%s'\n",argv[0], argv[d->optind][0], d->__nextchar);
-					}
-				}
-				d->__nextchar = (wchar_t *)L"";
-				d->optind++;
-				d->optopt = 0;
-				return L'?';
-			}
-	}
-	{
-		wchar_t c = *d->__nextchar++;
-		wchar_t *temp = (wchar_t*)wcschr(optstring, c);
-		if (*d->__nextchar == L'\0')
-			++d->optind;
-		if (temp == NULL || c == L':' || c == L';')
-		{
-			if (print_errors)
-			{
-				fwprintf(stderr, L"%s: invalid option -- '%c'\n", argv[0], c);
-			}
-			d->optopt = c;
-			return L'?';
-		}
-		if (temp[0] == L'W' && temp[1] == L';')
-		{
-			wchar_t *nameend;
-			const struct option_w *p;
-			const struct option_w *pfound = NULL;
-			int exact = 0;
-			int ambig = 0;
-			int indfound = 0;
-			int option_index;
-			if (longopts == NULL)
-				goto no_longs;
-			if (*d->__nextchar != L'\0')
-			{
-				d->optarg = d->__nextchar;
-				d->optind++;
-			}
-			else if (d->optind == argc)
-			{
-				if (print_errors)
-				{
-					fwprintf(stderr,L"%s: option requires an argument -- '%c'\n",argv[0], c);
-				}
-				d->optopt = c;
-				if (optstring[0] == L':')
-					c = L':';
-				else
-					c = L'?';
-				return c;
-			}
-			else
-				d->optarg = argv[d->optind++];
-			for (d->__nextchar = nameend = d->optarg; *nameend && *nameend != L'='; nameend++);
-			for (p = longopts, option_index = 0; p->name; p++, option_index++)
-				if (!wcsncmp(p->name, d->__nextchar, nameend - d->__nextchar))
-				{
-					if ((unsigned int) (nameend - d->__nextchar) == wcslen(p->name))
-					{
-						pfound = p;
-						indfound = option_index;
-						exact = 1;
-						break;
-					}
-					else if (pfound == NULL)
-					{
-						pfound = p;
-						indfound = option_index;
-					}
-					else if (long_only || pfound->has_arg != p->has_arg || pfound->flag != p->flag || pfound->val != p->val)
-						ambig = 1;
-				}
-				if (ambig && !exact)
-				{
-					if (print_errors)
-					{
-						fwprintf(stderr, L"%s: option '-W %s' is ambiguous\n",argv[0], d->optarg);
-					}
-					d->__nextchar += wcslen(d->__nextchar);
-					d->optind++;
-					return L'?';
-				}
-				if (pfound != NULL)
-				{
-					option_index = indfound;
-					if (*nameend)
-					{
-						if (pfound->has_arg)
-							d->optarg = nameend + 1;
-						else
-						{
-							if (print_errors)
-							{
-								fwprintf(stderr, L"%s: option '-W %s' doesn't allow an argument\n",argv[0], pfound->name);
-							}
-							d->__nextchar += wcslen(d->__nextchar);
-							return L'?';
-						}
-					}
-					else if (pfound->has_arg == 1)
-					{
-						if (d->optind < argc)
-							d->optarg = argv[d->optind++];
-						else
-						{
-							if (print_errors)
-							{
-								fwprintf(stderr, L"%s: option '-W %s' requires an argument\n",argv[0], pfound->name);
-							}
-							d->__nextchar += wcslen(d->__nextchar);
-							return optstring[0] == L':' ? L':' : L'?';
-						}
-					}
-					else
-						d->optarg = NULL;
-					d->__nextchar += wcslen(d->__nextchar);
-					if (longind != NULL)
-						*longind = option_index;
-					if (pfound->flag)
-					{
-						*(pfound->flag) = pfound->val;
-						return 0;
-					}
-					return pfound->val;
-				}
-no_longs:
-				d->__nextchar = NULL;
-				return L'W';
-		}
-		if (temp[1] == L':')
-		{
-			if (temp[2] == L':')
-			{
-				if (*d->__nextchar != L'\0')
-				{
-					d->optarg = d->__nextchar;
-					d->optind++;
-				}
-				else
-					d->optarg = NULL;
-				d->__nextchar = NULL;
-			}
-			else
-			{
-				if (*d->__nextchar != L'\0')
-				{
-					d->optarg = d->__nextchar;
-					d->optind++;
-				}
-				else if (d->optind == argc)
-				{
-					if (print_errors)
-					{
-						fwprintf(stderr,L"%s: option requires an argument -- '%c'\n",argv[0], c);
-					}
-					d->optopt = c;
-					if (optstring[0] == L':')
-						c = L':';
-					else
-						c = L'?';
-				}
-				else
-					d->optarg = argv[d->optind++];
-				d->__nextchar = NULL;
-			}
-		}
-		return c;
-	}
-}
-int _getopt_internal_w (int argc, wchar_t *const *argv, const wchar_t *optstring, const struct option_w *longopts, int *longind, int long_only, int posixly_correct)
-{
-	int result;
-	getopt_data_w.optind = optind;
-	getopt_data_w.opterr = opterr;
-	result = _getopt_internal_r_w (argc, argv, optstring, longopts,longind, long_only, &getopt_data_w,posixly_correct);
-	optind = getopt_data_w.optind;
-	optarg_w = getopt_data_w.optarg;
-	optopt = getopt_data_w.optopt;
-	return result;
-}
-int getopt_w (int argc, wchar_t *const *argv, const wchar_t *optstring) _GETOPT_THROW
-{
-	return _getopt_internal_w (argc, argv, optstring, (const struct option_w *) 0, (int *) 0, 0, 0);
-}
-int getopt_long_w (int argc, wchar_t *const *argv, const wchar_t *options, const struct option_w *long_options, int *opt_index) _GETOPT_THROW
-{
-	return _getopt_internal_w (argc, argv, options, long_options, opt_index, 0, 0);
-}
-int getopt_long_only_w (int argc, wchar_t *const *argv, const wchar_t *options, const struct option_w *long_options, int *opt_index) _GETOPT_THROW
-{
-	return _getopt_internal_w (argc, argv, options, long_options, opt_index, 1, 0);
-}
-int _getopt_long_r_w (int argc, wchar_t *const *argv, const wchar_t *options, const struct option_w *long_options, int *opt_index, struct _getopt_data_w *d)
-{
-	return _getopt_internal_r_w (argc, argv, options, long_options, opt_index,0, d, 0);
-}
-int _getopt_long_only_r_w (int argc, wchar_t *const *argv, const wchar_t *options, const struct option_w *long_options, int *opt_index, struct _getopt_data_w *d)
-{
-	return _getopt_internal_r_w (argc, argv, options, long_options, opt_index, 1, d, 0);
-}

examples/client/getopt.h

@@ -21,6 +21,7 @@ Revisions:
 08/01/2012 - Ludvik Jerabek - Created separate functions for char and wchar_t characters so single dll can do both unicode and ansi
 10/15/2012 - Ludvik Jerabek - Modified to match latest GNU features
 06/19/2015 - Ludvik Jerabek - Fixed maximum option limitation caused by option_a (255) and option_w (65535) structure val variable
+24/10/2020 - Paul-Louis Ageneau - Removed Unicode version
 
 **DISCLAIMER**
 THIS MATERIAL IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
@@ -79,7 +80,6 @@ EXPRESSLY ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 	#define ARG_OPT		2	/*Argument Optional*/
 
 	#include <string.h>
-	#include <wchar.h>
 
 _BEGIN_EXTERN_C
 
@@ -87,7 +87,6 @@ _BEGIN_EXTERN_C
 	extern _GETOPT_API int opterr;
 	extern _GETOPT_API int optopt;
 
-	// Ansi
 	struct option_a
 	{
 		const char* name;
@@ -100,19 +99,6 @@ _BEGIN_EXTERN_C
 	extern _GETOPT_API int getopt_long_a(int argc, char *const *argv, const char *options, const struct option_a *long_options, int *opt_index) _GETOPT_THROW;
 	extern _GETOPT_API int getopt_long_only_a(int argc, char *const *argv, const char *options, const struct option_a *long_options, int *opt_index) _GETOPT_THROW;
 
-	// Unicode
-	struct option_w
-	{
-		const wchar_t* name;
-		int has_arg;
-		int *flag;
-		int val;
-	};
-	extern _GETOPT_API wchar_t *optarg_w;
-	extern _GETOPT_API int getopt_w(int argc, wchar_t *const *argv, const wchar_t *optstring) _GETOPT_THROW;
-	extern _GETOPT_API int getopt_long_w(int argc, wchar_t *const *argv, const wchar_t *options, const struct option_w *long_options, int *opt_index) _GETOPT_THROW;
-	extern _GETOPT_API int getopt_long_only_w(int argc, wchar_t *const *argv, const wchar_t *options, const struct option_w *long_options, int *opt_index) _GETOPT_THROW;	
-	
 _END_EXTERN_C
 
 	#undef _BEGIN_EXTERN_C
@@ -120,17 +106,10 @@ _END_EXTERN_C
 	#undef _GETOPT_THROW
 	#undef _GETOPT_API
 
-	#ifdef _UNICODE
-		#define getopt getopt_w
-		#define getopt_long getopt_long_w
-		#define getopt_long_only getopt_long_only_w
-		#define option option_w
-		#define optarg optarg_w
-	#else
-		#define getopt getopt_a
-		#define getopt_long getopt_long_a
-		#define getopt_long_only getopt_long_only_a
-		#define option option_a
-		#define optarg optarg_a
-	#endif
+	#define getopt getopt_a
+	#define getopt_long getopt_long_a
+	#define getopt_long_only getopt_long_only_a
+	#define option option_a
+	#define optarg optarg_a
+
 #endif  // __GETOPT_H_

examples/client/main.cpp

@@ -23,15 +23,18 @@
 
 #include "rtc/rtc.hpp"
 
+#include "parse_cl.h"
+
 #include <nlohmann/json.hpp>
 
 #include <algorithm>
+#include <future>
 #include <iostream>
 #include <memory>
 #include <random>
+#include <stdexcept>
 #include <thread>
 #include <unordered_map>
-#include "parse_cl.h"
 
 using namespace rtc;
 using namespace std;
@@ -45,31 +48,23 @@ unordered_map<string, shared_ptr<PeerConnection>> peerConnectionMap;
 unordered_map<string, shared_ptr<DataChannel>> dataChannelMap;
 
 string localId;
-bool echoDataChannelMessages = false;
 
 shared_ptr<PeerConnection> createPeerConnection(const Configuration &config,
                                                 weak_ptr<WebSocket> wws, string id);
-void confirmOnStdout(bool echoed, string id, string type, size_t length);
 string randomId(size_t length);
 
-int main(int argc, char **argv) {
-	Cmdline *params = nullptr;
-	try {
-		params = new Cmdline(argc, argv);
-	} catch (const std::range_error&e) {
-		std::cout<< e.what() << '\n';
-		delete params;
-		return -1;
-	}
+int main(int argc, char **argv) try {
+	auto params = std::make_unique<Cmdline>(argc, argv);
 
-	rtc::InitLogger(LogLevel::Debug);
+	rtc::InitLogger(LogLevel::Info);
 
 	Configuration config;
 	string stunServer = "";
 	if (params->noStun()) {
-		cout << "No stun server is configured.  Only local hosts and public IP addresses suported." << endl;
+		cout << "No STUN server is configured. Only local hosts and public IP addresses supported."
+		     << endl;
 	} else {
-		if (params->stunServer().substr(0,5).compare("stun:") != 0) {
+		if (params->stunServer().substr(0, 5).compare("stun:") != 0) {
 			stunServer = "stun:";
 		}
 		stunServer += params->stunServer() + ":" + to_string(params->stunPort());
@@ -80,18 +75,23 @@ int main(int argc, char **argv) {
 	localId = randomId(4);
 	cout << "The local ID is: " << localId << endl;
 
-	echoDataChannelMessages = params->echoDataChannelMessages();
-	cout << "Received data channel messages will be "
-	     << (echoDataChannelMessages ? "echoed back to sender" : "printed to stdout") << endl;
-
 	auto ws = make_shared<WebSocket>();
 
-	ws->onOpen([]() { cout << "WebSocket connected, signaling ready" << endl; });
+	std::promise<void> wsPromise;
+	auto wsFuture = wsPromise.get_future();
+
+	ws->onOpen([&wsPromise]() {
+		cout << "WebSocket connected, signaling ready" << endl;
+		wsPromise.set_value();
+	});
+
+	ws->onError([&wsPromise](string s) {
+		cout << "WebSocket error" << endl;
+		wsPromise.set_exception(std::make_exception_ptr(std::runtime_error(s)));
+	});
 
 	ws->onClosed([]() { cout << "WebSocket closed" << endl; });
 
-	ws->onError([](const string &error) { cout << "WebSocket failed: " << error << endl; });
-
 	ws->onMessage([&](variant<binary, string> data) {
 		if (!holds_alternative<string>(data))
 			return;
@@ -129,20 +129,16 @@ int main(int argc, char **argv) {
 	});
 
 	string wsPrefix = "";
-	if (params->webSocketServer().substr(0,5).compare("ws://") != 0) {
+	if (params->webSocketServer().substr(0, 5).compare("ws://") != 0) {
 		wsPrefix = "ws://";
 	}
 	const string url = wsPrefix + params->webSocketServer() + ":" +
-		to_string(params->webSocketPort()) + "/" + localId;
+	                   to_string(params->webSocketPort()) + "/" + localId;
 	cout << "Url is " << url << endl;
 	ws->open(url);
 
 	cout << "Waiting for signaling to be connected..." << endl;
-	while (!ws->isOpen()) {
-		if (ws->isClosed())
-			return 1;
-		this_thread::sleep_for(100ms);
-	}
+	wsFuture.get();
 
 	while (true) {
 		string id;
@@ -170,33 +166,28 @@ int main(int argc, char **argv) {
 
 		dc->onClosed([id]() { cout << "DataChannel from " << id << " closed" << endl; });
 
-		dc->onMessage([id, wdc = make_weak_ptr(dc)](const variant<binary, string> &message) {
-			static bool firstMessage = true;
-			if (holds_alternative<string>(message) && (!echoDataChannelMessages || firstMessage)) {
-				cout << "Message from " << id << " received: " << get<string>(message) << endl;
-				firstMessage = false;
-			} else if (echoDataChannelMessages) {
-				bool echoed = false;
-				if (auto dc = wdc.lock()) {
-					dc->send(message);
-					echoed = true;
-				}
-				confirmOnStdout(echoed, id, (holds_alternative<string>(message) ? "text" : "binary"),
-						get<string>(message).length());
-			}
+		dc->onMessage([id, wdc = make_weak_ptr(dc)](variant<binary, string> data) {
+			if (holds_alternative<string>(data))
+				cout << "Message from " << id << " received: " << get<string>(data) << endl;
+			else
+				cout << "Binary message from " << id
+				     << " received, size=" << get<binary>(data).size() << endl;
 		});
 
 		dataChannelMap.emplace(id, dc);
-
-		this_thread::sleep_for(1s);
 	}
 
 	cout << "Cleaning up..." << endl;
 
 	dataChannelMap.clear();
 	peerConnectionMap.clear();
-	delete params;
 	return 0;
+
+} catch (const std::exception &e) {
+	std::cout << "Error: " << e.what() << std::endl;
+	dataChannelMap.clear();
+	peerConnectionMap.clear();
+	return -1;
 }
 
 // Create and setup a PeerConnection
@@ -233,20 +224,12 @@ shared_ptr<PeerConnection> createPeerConnection(const Configuration &config,
 
 		dc->onClosed([id]() { cout << "DataChannel from " << id << " closed" << endl; });
 
-		dc->onMessage([id, wdc = make_weak_ptr(dc)](const variant<binary, string> &message) {
-			static bool firstMessage = true;
-			if (holds_alternative<string>(message) && (!echoDataChannelMessages || firstMessage)) {
-				cout << "Message from " << id << " received: " << get<string>(message) << endl;
-				firstMessage = false;
-			} else if (echoDataChannelMessages) {
-				bool echoed = false;
-				if (auto dc = wdc.lock()) {
-					dc->send(message);
-					echoed = true;
-				}
-				confirmOnStdout(echoed, id, (holds_alternative<string>(message) ? "text" : "binary"),
-						get<string>(message).length());
-			}
+		dc->onMessage([id, wdc = make_weak_ptr(dc)](variant<binary, string> data) {
+			if (holds_alternative<string>(data))
+				cout << "Message from " << id << " received: " << get<string>(data) << endl;
+			else
+				cout << "Binary message from " << id
+				     << " received, size=" << get<binary>(data).size() << endl;
 		});
 
 		dc->send("Hello from " + localId);
@@ -258,19 +241,6 @@ shared_ptr<PeerConnection> createPeerConnection(const Configuration &config,
 	return pc;
 };
 
-void confirmOnStdout(bool echoed, string id, string type, size_t length) {
-	static long count = 0;
-	static long freq = 100;
-	if (!(++count%freq)) {
-		cout << "Received " << count << " pings in total from host " << id << ", most recent of type "
-		     << type << " and " << (echoed ? "" : "un") << "successfully echoed most recent ping of size "
-		     << length << " back to " << id << endl;
-		if (count >= (freq * 10) && freq < 1000000) {
-			freq *= 10;
-		}
-	}
-}
-
 // Helper function to generate a random ID
 string randomId(size_t length) {
 	static const string characters(

examples/client/parse_cl.cpp

@@ -43,47 +43,39 @@ Cmdline::Cmdline (int argc, char *argv[]) // ISO C++17 not allowed: throw (std::
 
   static struct option long_options[] =
   {
-    {"echo", no_argument, NULL, 'e'},
     {"noStun", no_argument, NULL, 'n'},
     {"stunServer", required_argument, NULL, 's'},
     {"stunPort", required_argument, NULL, 't'},
     {"webSocketServer", required_argument, NULL, 'w'},
     {"webSocketPort", required_argument, NULL, 'x'},
     {"help", no_argument, NULL, 'h'},
-    {"version", no_argument, NULL, 'v'},
     {NULL, 0, NULL, 0}
   };
 
   _program_name += argv[0];
 
   /* default values */
-  _e = false;
   _n = false;
   _s = "stun.l.google.com";
   _t = 19302;
   _w = "localhost";
   _x = 8000;
   _h = false;
-  _v = false;
 
   optind = 0;
   while ((c = getopt_long (argc, argv, "s:t:w:x:enhv", long_options, &optind)) != - 1)
     {
       switch (c)
         {
-        case 'e': 
-          _e = true;
-          break;
-
-        case 'n': 
+        case 'n':
           _n = true;
           break;
 
-        case 's': 
+        case 's':
           _s = optarg;
           break;
 
-        case 't': 
+        case 't':
           _t = atoi (optarg);
           if (_t < 0)
             {
@@ -99,11 +91,11 @@ Cmdline::Cmdline (int argc, char *argv[]) // ISO C++17 not allowed: throw (std::
             }
           break;
 
-        case 'w': 
+        case 'w':
           _w = optarg;
           break;
 
-        case 'x': 
+        case 'x':
           _x = atoi (optarg);
           if (_x < 0)
             {
@@ -119,16 +111,11 @@ Cmdline::Cmdline (int argc, char *argv[]) // ISO C++17 not allowed: throw (std::
             }
           break;
 
-        case 'h': 
+        case 'h':
           _h = true;
           this->usage (EXIT_SUCCESS);
           break;
 
-        case 'v': 
-          _v = true;
-          this->version (EXIT_SUCCESS);
-          break;
-
         default:
           this->usage (EXIT_FAILURE);
 
@@ -155,8 +142,6 @@ void Cmdline::usage (int status)
       std::cout << "\
 usage: " << _program_name << " [ -enstwxhv ] \n\
 libdatachannel client implementing WebRTC Data Channels with WebSocket signaling\n\
-   [ -e ] [ --echo ] (type=FLAG)\n\
-          Echo data channel messages back to sender rather than putting to stdout.\n\
    [ -n ] [ --noStun ] (type=FLAG)\n\
           Do NOT use a stun server (overrides -s and -t).\n\
    [ -s ] [ --stunServer ] (type=STRING, default=stun.l.google.com)\n\
@@ -168,15 +153,8 @@ libdatachannel client implementing WebRTC Data Channels with WebSocket signaling
    [ -x ] [ --webSocketPort ] (type=INTEGER, range=0...65535, default=8000)\n\
           Web socket server port.\n\
    [ -h ] [ --help ] (type=FLAG)\n\
-          Display this help and exit.\n\
-   [ -v ] [ --version ] (type=FLAG)\n\
-          Output version information and exit.\n";
+          Display this help and exit.\n";
     }
   exit (status);
 }
 
-void Cmdline::version (int status)
-{
-  std::cout << _program_name << " v0.5\n";
-  exit (status);
-}

examples/client/parse_cl.h

@@ -34,14 +34,12 @@ class Cmdline
 {
 private:
   /* parameters */
-  bool _e;
   bool _n;
   std::string _s;
   int _t;
   std::string _w;
   int _x;
   bool _h;
-  bool _v;
 
   /* other stuff to keep track of */
   std::string _program_name;
@@ -55,20 +53,15 @@ public:
   /* usage function */
   void usage (int status);
 
-  /* version function */
-  void version (int status);
-
   /* return next (non-option) parameter */
   int next_param () { return _optind; }
 
-  bool echoDataChannelMessages () const { return _e; }
   bool noStun () const { return _n; }
   std::string stunServer () const { return _s; }
   int stunPort () const { return _t; }
   std::string webSocketServer () const { return _w; }
   int webSocketPort () const { return _x; }
   bool h () const { return _h; }
-  bool v () const { return _v; }
 };
 
 #endif

examples/copy-paste-capi/answerer.c

@@ -34,23 +34,23 @@ static void sleep(unsigned int secs) { Sleep(secs * 1000); }
 #endif
 
 typedef struct {
-        rtcState state;
-        rtcGatheringState gatheringState;
-        int pc;
-        int dc;
-        bool connected;
+	rtcState state;
+	rtcGatheringState gatheringState;
+	int pc;
+	int dc;
+	bool connected;
 } Peer;
 
-static void dataChannelCallback(int dc, void *ptr);
-static void descriptionCallback(const char *sdp, const char *type, void *ptr);
-static void candidateCallback(const char *cand, const char *mid, void *ptr);
-static void stateChangeCallback(rtcState state, void *ptr);
-static void gatheringStateCallback(rtcGatheringState state, void *ptr);
-static void closedCallback(void *ptr);
-static void messageCallback(const char *message, int size, void *ptr);
+static void RTC_API dataChannelCallback(int pc, int dc, void *ptr);
+static void RTC_API descriptionCallback(int pc, const char *sdp, const char *type, void *ptr);
+static void RTC_API candidateCallback(int pc, const char *cand, const char *mid, void *ptr);
+static void RTC_API stateChangeCallback(int pc, rtcState state, void *ptr);
+static void RTC_API gatheringStateCallback(int pc, rtcGatheringState state, void *ptr);
+static void RTC_API closedCallback(int id, void *ptr);
+static void RTC_API messageCallback(int id, const char *message, int size, void *ptr);
 static void deletePeer(Peer *peer);
 
-char* state_print(rtcState state);
+char *state_print(rtcState state);
 char *rtcGatheringState_print(rtcGatheringState state);
 
 int all_space(const char *str);
@@ -66,189 +66,185 @@ int main(int argc, char **argv) {
 	if (!peer) {
 		fprintf(stderr, "Error allocating memory for peer\n");
 		return -1;
-	    }
-        memset(peer, 0, sizeof(Peer));
+	}
+	memset(peer, 0, sizeof(Peer));
 
-        printf("Peer created\n");
+	printf("Peer created\n");
 
-        // Create peer connection
-        peer->pc = rtcCreatePeerConnection(&config);
+	// Create peer connection
+	peer->pc = rtcCreatePeerConnection(&config);
 
-        rtcSetUserPointer(peer->pc, peer);
-        rtcSetLocalDescriptionCallback(peer->pc, descriptionCallback);
-        rtcSetLocalCandidateCallback(peer->pc, candidateCallback);
-        rtcSetStateChangeCallback(peer->pc, stateChangeCallback);
-        rtcSetGatheringStateChangeCallback(peer->pc, gatheringStateCallback);
+	rtcSetUserPointer(peer->pc, peer);
+	rtcSetLocalDescriptionCallback(peer->pc, descriptionCallback);
+	rtcSetLocalCandidateCallback(peer->pc, candidateCallback);
+	rtcSetStateChangeCallback(peer->pc, stateChangeCallback);
+	rtcSetGatheringStateChangeCallback(peer->pc, gatheringStateCallback);
 
-        rtcSetUserPointer(peer->dc, NULL);
-        rtcSetDataChannelCallback(peer->pc, dataChannelCallback);
+	rtcSetUserPointer(peer->dc, NULL);
+	rtcSetDataChannelCallback(peer->pc, dataChannelCallback);
 
-	    sleep(1);
+	sleep(1);
 
-	    bool exit = false;
-        while (!exit) {
-                printf("\n");
-                printf("***************************************************************************************\n");
-                printf("* 0: Exit /"
-                       " 1: Enter remote description /"
-                       " 2: Enter remote candidate /"
-                       " 3: Send message /"
-                       " 4: Print Connection Info *\n"
-                       "[Command]: ");
+	bool exit = false;
+	while (!exit) {
+		printf("\n");
+		printf("***********************************************************************************"
+		       "****\n");
+		printf("* 0: Exit /"
+		       " 1: Enter remote description /"
+		       " 2: Enter remote candidate /"
+		       " 3: Send message /"
+		       " 4: Print Connection Info *\n"
+		       "[Command]: ");
 
-                int command = -1;
-                int c;
+		int command = -1;
+		int c;
 
-		        if (!scanf("%d", &command)) {
-			        break;
-		        }
+		if (!scanf("%d", &command)) {
+			break;
+		}
 
-		        while ((c = getchar()) != '\n' && c != EOF) {
-		        }
-		        fflush(stdin);
+		while ((c = getchar()) != '\n' && c != EOF) {
+		}
+		fflush(stdin);
 
-		        switch (command) {
-                case 0: {
-                        exit = true;
-                        break;
-                }
-                case 1: {
-                        // Parse Description
-                        printf("[Description]: ");
-                        char *line = NULL;
-                        size_t len = 0;
-                        size_t read = 0;
-                        char *sdp = (char*) malloc(sizeof(char));
-                        while ((read = getline(&line, &len, stdin)) != -1 && !all_space(line)) {
-                                sdp = (char*) realloc (sdp,(strlen(sdp)+1) +strlen(line)+1);
-                                strcat(sdp, line);
+		switch (command) {
+		case 0: {
+			exit = true;
+			break;
+		}
+		case 1: {
+			// Parse Description
+			printf("[Description]: ");
+			char *line = NULL;
+			size_t len = 0;
+			size_t read = 0;
+			char *sdp = (char *)malloc(sizeof(char));
+			while ((read = getline(&line, &len, stdin)) != -1 && !all_space(line)) {
+				sdp = (char *)realloc(sdp, (strlen(sdp) + 1) + strlen(line) + 1);
+				strcat(sdp, line);
+			}
+			printf("%s\n", sdp);
+			rtcSetRemoteDescription(peer->pc, sdp, "offer");
+			free(sdp);
+			free(line);
+			break;
+		}
+		case 2: {
+			// Parse Candidate
+			printf("[Candidate]: ");
+			char *candidate = NULL;
+			size_t candidate_size = 0;
 
-                        }
-                        printf("%s\n",sdp);
-                        rtcSetRemoteDescription(peer->pc, sdp, "offer");
-                        free(sdp);
-                        free(line);
-                        break;
+			if (getline(&candidate, &candidate_size, stdin)) {
+				rtcAddRemoteCandidate(peer->pc, candidate, NULL);
+				free(candidate);
 
-                }
-                case 2: {
-                        // Parse Candidate
-                        printf("[Candidate]: ");
-                        char* candidate = NULL;
-                        size_t candidate_size = 0;
+			} else {
+				printf("Error reading line\n");
+				break;
+			}
 
-                        if(getline(&candidate, &candidate_size, stdin)) {
-                                rtcAddRemoteCandidate(peer->pc, candidate, "0");
-                                free(candidate);
+			break;
+		}
+		case 3: {
+			// Send Message
+			if (!peer->connected) {
+				printf("** Channel is not Open **");
+				break;
+			}
+			printf("[Message]: ");
+			char *message = NULL;
+			size_t message_size = 0;
 
-			            } else {
-				            printf("Error reading line\n");
-				            break;
-			            }
+			if (getline(&message, &message_size, stdin)) {
+				rtcSendMessage(peer->dc, message, -1);
+				free(message);
+			} else {
+				printf("Error reading line\n");
+				break;
+			}
+			break;
+		}
+		case 4: {
+			// Connection Info
+			if (!peer->connected) {
+				printf("** Channel is not Open **");
+				break;
+			}
+			char buffer[256];
+			if (rtcGetLocalAddress(peer->pc, buffer, 256) >= 0)
+				printf("Local address 1:  %s\n", buffer);
+			if (rtcGetRemoteAddress(peer->pc, buffer, 256) >= 0)
+				printf("Remote address 1: %s\n", buffer);
 
-			            break;
-                }
-                case 3: {
-                        // Send Message
-                        if(!peer->connected) {
-                                printf("** Channel is not Open **");
-                                break;
-                        }
-                        printf("[Message]: ");
-                        char* message = NULL;
-                        size_t message_size = 0;
+			else
+				printf("Could not get Candidate Pair Info\n");
+			break;
+		}
+		default: {
+			printf("** Invalid Command **");
+			break;
+		}
+		}
+	}
 
-                        if(getline(&message, &message_size, stdin)) {
-                                rtcSendMessage(peer->dc, message, -1);
-                                free(message);
-			            } else {
-				            printf("Error reading line\n");
-				            break;
-			            }
-			            break;
-                }
-                case 4: {
-                        // Connection Info
-                        if(!peer->connected) {
-                                printf("** Channel is not Open **");
-                                break;
-                        }
-                        char buffer[256];
-                        if (rtcGetLocalAddress(peer->pc, buffer, 256) >= 0)
-                                printf("Local address 1:  %s\n", buffer);
-                        if (rtcGetRemoteAddress(peer->pc, buffer, 256) >= 0)
-                                printf("Remote address 1: %s\n", buffer);
-
-                        else
-                                printf("Could not get Candidate Pair Info\n");
-                        break;
-                }
-                default: {
-                        printf("** Invalid Command **");
-                        break;
-                }
-                }
-        }
-
-        deletePeer(peer);
-        return 0;
+	deletePeer(peer);
+	return 0;
 }
 
-static void descriptionCallback(const char *sdp, const char *type, void *ptr) {
-        // Peer *peer = (Peer *)ptr;
-        printf("Description %s:\n%s\n", "answerer", sdp);
+static void RTC_API descriptionCallback(int pc, const char *sdp, const char *type, void *ptr) {
+	printf("Description %s:\n%s\n", "answerer", sdp);
 }
 
-static void candidateCallback(const char *cand, const char *mid, void *ptr) {
-        // Peer *peer = (Peer *)ptr;
-        printf("Candidate %s: %s\n", "answerer", cand);
-
+static void RTC_API candidateCallback(int pc, const char *cand, const char *mid, void *ptr) {
+	printf("Candidate %s: %s\n", "answerer", cand);
 }
 
-static void stateChangeCallback(rtcState state, void *ptr) {
-        Peer *peer = (Peer *)ptr;
-        peer->state = state;
-        printf("State %s: %s\n", "answerer", state_print(state));
+static void RTC_API stateChangeCallback(int pc, rtcState state, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->state = state;
+	printf("State %s: %s\n", "answerer", state_print(state));
 }
 
-static void gatheringStateCallback(rtcGatheringState state, void *ptr) {
-        Peer *peer = (Peer *)ptr;
-        peer->gatheringState = state;
-        printf("Gathering state %s: %s\n", "answerer", rtcGatheringState_print(state));
+static void RTC_API gatheringStateCallback(int pc, rtcGatheringState state, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->gatheringState = state;
+	printf("Gathering state %s: %s\n", "answerer", rtcGatheringState_print(state));
 }
 
-static void closedCallback(void *ptr) {
-        Peer *peer = (Peer *)ptr;
-        peer->connected = false;
+static void RTC_API closedCallback(int id, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->connected = false;
 }
 
-static void messageCallback(const char *message, int size, void *ptr) {
-        if (size < 0) { // negative size indicates a null-terminated string
-                printf("Message %s: %s\n", "answerer", message);
-        } else {
-                printf("Message %s: [binary of size %d]\n", "answerer", size);
-        }
+static void RTC_API messageCallback(int id, const char *message, int size, void *ptr) {
+	if (size < 0) { // negative size indicates a null-terminated string
+		printf("Message %s: %s\n", "answerer", message);
+	} else {
+		printf("Message %s: [binary of size %d]\n", "answerer", size);
+	}
+}
+
+static void RTC_API dataChannelCallback(int pc, int dc, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->dc = dc;
+	peer->connected = true;
+	rtcSetClosedCallback(dc, closedCallback);
+	rtcSetMessageCallback(dc, messageCallback);
+	char buffer[256];
+	if (rtcGetDataChannelLabel(dc, buffer, 256) >= 0)
+		printf("DataChannel %s: Received with label \"%s\"\n", "answerer", buffer);
 }
 
 static void deletePeer(Peer *peer) {
-        if (peer) {
-                if (peer->dc)
-                        rtcDeleteDataChannel(peer->dc);
-                if (peer->pc)
-                        rtcDeletePeerConnection(peer->pc);
-                free(peer);
-        }
-}
-
-static void dataChannelCallback(int dc, void *ptr) {
-        Peer *peer = (Peer *)ptr;
-        peer->dc = dc;
-        peer->connected = true;
-        rtcSetClosedCallback(dc, closedCallback);
-        rtcSetMessageCallback(dc, messageCallback);
-        char buffer[256];
-        if (rtcGetDataChannelLabel(dc, buffer, 256) >= 0)
-                printf("DataChannel %s: Received with label \"%s\"\n", "answerer", buffer);
+	if (peer) {
+		if (peer->dc)
+			rtcDeleteDataChannel(peer->dc);
+		if (peer->pc)
+			rtcDeletePeerConnection(peer->pc);
+		free(peer);
+	}
 }
 
 char *state_print(rtcState state) {

examples/copy-paste-capi/offerer.c

@@ -34,20 +34,20 @@ static void sleep(unsigned int secs) { Sleep(secs * 1000); }
 #endif
 
 typedef struct {
-        rtcState state;
-        rtcGatheringState gatheringState;
-        int pc;
-        int dc;
-        bool connected;
+	rtcState state;
+	rtcGatheringState gatheringState;
+	int pc;
+	int dc;
+	bool connected;
 } Peer;
 
-static void descriptionCallback(const char *sdp, const char *type, void *ptr);
-static void candidateCallback(const char *cand, const char *mid, void *ptr);
-static void stateChangeCallback(rtcState state, void *ptr);
-static void gatheringStateCallback(rtcGatheringState state, void *ptr);
-static void openCallback(void *ptr);
-static void closedCallback(void *ptr);
-static void messageCallback(const char *message, int size, void *ptr);
+static void RTC_API descriptionCallback(int pc, const char *sdp, const char *type, void *ptr);
+static void RTC_API candidateCallback(int pc, const char *cand, const char *mid, void *ptr);
+static void RTC_API stateChangeCallback(int pc, rtcState state, void *ptr);
+static void RTC_API gatheringStateCallback(int pc, rtcGatheringState state, void *ptr);
+static void RTC_API openCallback(int id, void *ptr);
+static void RTC_API closedCallback(int id, void *ptr);
+static void RTC_API messageCallback(int id, const char *message, int size, void *ptr);
 static void deletePeer(Peer *peer);
 
 char *state_print(rtcState state);
@@ -55,7 +55,7 @@ char *rtcGatheringState_print(rtcGatheringState state);
 
 int all_space(const char *str);
 
-int main(int argc, char **argv){
+int main(int argc, char **argv) {
 	rtcInitLogger(RTC_LOG_DEBUG, NULL);
 
 	// Create peer
@@ -66,192 +66,185 @@ int main(int argc, char **argv){
 	if (!peer) {
 		fprintf(stderr, "Error allocating memory for peer\n");
 		return -1;
-	    }
-	    memset(peer, 0, sizeof(Peer));
+	}
+	memset(peer, 0, sizeof(Peer));
 
-        printf("Peer created\n");
+	printf("Peer created\n");
 
-        // Create peer connection
-        peer->pc = rtcCreatePeerConnection(&config);
-        rtcSetUserPointer(peer->pc, peer);
-        rtcSetLocalDescriptionCallback(peer->pc, descriptionCallback);
-        rtcSetLocalCandidateCallback(peer->pc, candidateCallback);
-        rtcSetStateChangeCallback(peer->pc, stateChangeCallback);
-        rtcSetGatheringStateChangeCallback(peer->pc, gatheringStateCallback);
+	// Create peer connection
+	peer->pc = rtcCreatePeerConnection(&config);
+	rtcSetUserPointer(peer->pc, peer);
+	rtcSetLocalDescriptionCallback(peer->pc, descriptionCallback);
+	rtcSetLocalCandidateCallback(peer->pc, candidateCallback);
+	rtcSetStateChangeCallback(peer->pc, stateChangeCallback);
+	rtcSetGatheringStateChangeCallback(peer->pc, gatheringStateCallback);
 
-        // Since this is the offere, we will create a datachannel
-        peer->dc = rtcCreateDataChannel(peer->pc, "test");
-        rtcSetOpenCallback(peer->dc, openCallback);
-        rtcSetClosedCallback(peer->dc, closedCallback);
-        rtcSetMessageCallback(peer->dc, messageCallback);
+	// Since we are the offerer, we will create a datachannel
+	peer->dc = rtcCreateDataChannel(peer->pc, "test");
+	rtcSetOpenCallback(peer->dc, openCallback);
+	rtcSetClosedCallback(peer->dc, closedCallback);
+	rtcSetMessageCallback(peer->dc, messageCallback);
 
-	    sleep(1);
+	sleep(1);
 
-	    bool exit = false;
-        while (!exit) {
+	bool exit = false;
+	while (!exit) {
 
-                printf("\n");
-                printf("***************************************************************************************\n");
-                printf("* 0: Exit /"
-                       " 1: Enter remote description /"
-                       " 2: Enter remote candidate /"
-                       " 3: Send message /"
-                       " 4: Print Connection Info *\n"
-                       "[Command]: ");
+		printf("\n");
+		printf("***********************************************************************************"
+		       "****\n");
+		printf("* 0: Exit /"
+		       " 1: Enter remote description /"
+		       " 2: Enter remote candidate /"
+		       " 3: Send message /"
+		       " 4: Print Connection Info *\n"
+		       "[Command]: ");
 
-                int command = -1;
-                int c;
+		int command = -1;
+		int c;
 
-		        if (!scanf("%d", &command)) {
-			        break;
-		        }
+		if (!scanf("%d", &command)) {
+			break;
+		}
 
-		        while ((c = getchar()) != '\n' && c != EOF) {
-		        }
-		        fflush(stdin);
+		while ((c = getchar()) != '\n' && c != EOF) {
+		}
+		fflush(stdin);
 
-                switch (command) {
-                case 0: {
-                        exit = true;
-                        break;
-                }
-                case 1: {
-                        // Parse Description
-                        printf("[Description]: ");
+		switch (command) {
+		case 0: {
+			exit = true;
+			break;
+		}
+		case 1: {
+			// Parse Description
+			printf("[Description]: ");
 
+			char *line = NULL;
+			size_t len = 0;
+			size_t read = 0;
+			char *sdp = (char *)malloc(sizeof(char));
+			while ((read = getline(&line, &len, stdin)) != -1 && !all_space(line)) {
+				sdp = (char *)realloc(sdp, (strlen(sdp) + 1) + strlen(line) + 1);
+				strcat(sdp, line);
+			}
+			printf("%s\n", sdp);
+			rtcSetRemoteDescription(peer->pc, sdp, "answer");
+			free(sdp);
+			free(line);
+			break;
+		}
+		case 2: {
+			// Parse Candidate
+			printf("[Candidate]: ");
+			char *candidate = NULL;
+			size_t candidate_size = 0;
+			if (getline(&candidate, &candidate_size, stdin)) {
+				rtcAddRemoteCandidate(peer->pc, candidate, NULL);
+				free(candidate);
 
-                        char *line = NULL;
-                        size_t len = 0;
-                        size_t read = 0;
-                        char *sdp = (char*) malloc(sizeof(char));
-                        while ((read = getline(&line, &len, stdin)) != -1 && !all_space(line)) {
-                                sdp = (char*) realloc (sdp,(strlen(sdp)+1) +strlen(line)+1);
-                                strcat(sdp, line);
+			} else {
+				printf("Error reading line\n");
+				break;
+			}
 
-                        }
-                        printf("%s\n",sdp);
-                        rtcSetRemoteDescription(peer->pc, sdp, "answer");
-                        free(sdp);
-                        free(line);
-                        break;
+			break;
+		}
+		case 3: {
+			// Send Message
+			if (!peer->connected) {
+				printf("** Channel is not Open **");
+				break;
+			}
+			printf("[Message]: ");
+			char *message = NULL;
+			size_t message_size = 0;
+			if (getline(&message, &message_size, stdin)) {
+				rtcSendMessage(peer->dc, message, -1);
+				free(message);
+			} else {
+				printf("Error reading line\n");
+				break;
+			}
 
-                }
-                case 2: {
-                        // Parse Candidate
-                        printf("[Candidate]: ");
-                        char* candidate = NULL;
-                        size_t candidate_size = 0;
-                        if(getline(&candidate, &candidate_size, stdin)) {
-                                rtcAddRemoteCandidate(peer->pc, candidate, "0");
-                                free(candidate);
+			break;
+		}
+		case 4: {
+			// Connection Info
+			if (!peer->connected) {
+				printf("** Channel is not Open **");
+				break;
+			}
+			char buffer[256];
+			if (rtcGetLocalAddress(peer->pc, buffer, 256) >= 0)
+				printf("Local address 1:  %s\n", buffer);
+			if (rtcGetRemoteAddress(peer->pc, buffer, 256) >= 0)
+				printf("Remote address 1: %s\n", buffer);
 
-                        }else {
-                                printf("Error reading line\n");
-                                break;
-                        }
+			else
+				printf("Could not get Candidate Pair Info\n");
+			break;
+		}
+		default: {
+			printf("** Invalid Command **");
+			break;
+		}
+		}
+	}
 
-
-                        break;
-                }
-                case 3: {
-                        // Send Message
-                        if(!peer->connected) {
-                                printf("** Channel is not Open **");
-                                break;
-                        }
-                        printf("[Message]: ");
-                        char* message = NULL;
-                        size_t message_size = 0;
-                        if(getline(&message, &message_size, stdin)) {
-                                rtcSendMessage(peer->dc, message, -1);
-                                free(message);
-                        }else {
-                                printf("Error reading line\n");
-                                break;
-                        }
-
-                        break;
-                }
-                case 4: {
-                        // Connection Info
-                        if(!peer->connected) {
-                                printf("** Channel is not Open **");
-                                break;
-                        }
-                        char buffer[256];
-                        if (rtcGetLocalAddress(peer->pc, buffer, 256) >= 0)
-                                printf("Local address 1:  %s\n", buffer);
-                        if (rtcGetRemoteAddress(peer->pc, buffer, 256) >= 0)
-                                printf("Remote address 1: %s\n", buffer);
-
-                        else
-                                printf("Could not get Candidate Pair Info\n");
-                        break;
-                }
-                default: {
-                        printf("** Invalid Command **");
-                        break;
-                }
-                }
-        }
-
-        deletePeer(peer);
-        return 0;
+	deletePeer(peer);
+	return 0;
 }
 
-static void descriptionCallback(const char *sdp, const char *type, void *ptr) {
-        // Peer *peer = (Peer *)ptr;
-        printf("Description %s:\n%s\n", "offerer", sdp);
+static void RTC_API descriptionCallback(int pc, const char *sdp, const char *type, void *ptr) {
+	printf("Description %s:\n%s\n", "offerer", sdp);
 }
 
-static void candidateCallback(const char *cand, const char *mid, void *ptr) {
-        // Peer *peer = (Peer *)ptr;
-        printf("Candidate %s: %s\n", "offerer", cand);
-
+static void RTC_API candidateCallback(int pc, const char *cand, const char *mid, void *ptr) {
+	printf("Candidate %s: %s\n", "offerer", cand);
 }
 
-static void stateChangeCallback(rtcState state, void *ptr) {
-        Peer *peer = (Peer *)ptr;
-        peer->state = state;
-        printf("State %s: %s\n", "offerer", state_print(state));
+static void RTC_API stateChangeCallback(int pc, rtcState state, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->state = state;
+	printf("State %s: %s\n", "offerer", state_print(state));
 }
 
-static void gatheringStateCallback(rtcGatheringState state, void *ptr) {
-        Peer *peer = (Peer *)ptr;
-        peer->gatheringState = state;
-        printf("Gathering state %s: %s\n", "offerer", rtcGatheringState_print(state));
+static void RTC_API gatheringStateCallback(int pc, rtcGatheringState state, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->gatheringState = state;
+	printf("Gathering state %s: %s\n", "offerer", rtcGatheringState_print(state));
 }
 
-static void openCallback(void *ptr) {
-        Peer *peer = (Peer *)ptr;
-        peer->connected = true;
-        char buffer[256];
-        if (rtcGetDataChannelLabel(peer->dc, buffer, 256) >= 0)
-                printf("DataChannel %s: Received with label \"%s\"\n","offerer", buffer);
+static void RTC_API openCallback(int id, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->connected = true;
+	char buffer[256];
+	if (rtcGetDataChannelLabel(peer->dc, buffer, 256) >= 0)
+		printf("DataChannel %s: Received with label \"%s\"\n", "offerer", buffer);
 }
 
-static void closedCallback(void *ptr) {
-        Peer *peer = (Peer *)ptr;
-        peer->connected = false;
+static void RTC_API closedCallback(int id, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->connected = false;
 }
 
-static void messageCallback(const char *message, int size, void *ptr) {
-        // Peer *peer = (Peer *)ptr;
-        if (size < 0) { // negative size indicates a null-terminated string
-                printf("Message %s: %s\n", "offerer", message);
-        } else {
-                printf("Message %s: [binary of size %d]\n", "offerer", size);
-        }
+static void RTC_API messageCallback(int id, const char *message, int size, void *ptr) {
+	if (size < 0) { // negative size indicates a null-terminated string
+		printf("Message %s: %s\n", "offerer", message);
+	} else {
+		printf("Message %s: [binary of size %d]\n", "offerer", size);
+	}
 }
 
 static void deletePeer(Peer *peer) {
-        if (peer) {
-                if (peer->dc)
-                        rtcDeleteDataChannel(peer->dc);
-                if (peer->pc)
-                        rtcDeletePeerConnection(peer->pc);
-                free(peer);
-        }
+	if (peer) {
+		if (peer->dc)
+			rtcDeleteDataChannel(peer->dc);
+		if (peer->pc)
+			rtcDeletePeerConnection(peer->pc);
+		free(peer);
+	}
 }
 
 char *state_print(rtcState state) {

examples/copy-paste/CMakeLists.txt

@@ -4,19 +4,11 @@ add_executable(datachannel-copy-paste-offerer offerer.cpp)
 set_target_properties(datachannel-copy-paste-offerer PROPERTIES
 	CXX_STANDARD 17
 	OUTPUT_NAME offerer)
-if(WIN32)
-	target_link_libraries(datachannel-copy-paste-offerer datachannel-static) # DLL exports only the C API
-else()
-	target_link_libraries(datachannel-copy-paste-offerer datachannel)
-endif()
+target_link_libraries(datachannel-copy-paste-offerer datachannel)
 
 add_executable(datachannel-copy-paste-answerer answerer.cpp)
 set_target_properties(datachannel-copy-paste-answerer PROPERTIES
 	CXX_STANDARD 17
 	OUTPUT_NAME answerer)
-if(WIN32)
-	target_link_libraries(datachannel-copy-paste-answerer datachannel-static) # DLL exports only the C API
-else()
-	target_link_libraries(datachannel-copy-paste-answerer datachannel)
-endif()
+target_link_libraries(datachannel-copy-paste-answerer datachannel)
 

examples/copy-paste/answerer.cpp

@@ -127,13 +127,11 @@ int main(int argc, char **argv) {
 				cout << "** Channel is not Open ** ";
 				break;
 			}
-			CandidateInfo local, remote;
+			Candidate local, remote;
 			std::optional<std::chrono::milliseconds> rtt = pc->rtt();
 			if (pc->getSelectedCandidatePair(&local, &remote)) {
-				cout << "Local: " << local.address << ":" << local.port << " " << local.type << " "
-				     << local.transportType << endl;
-				cout << "Remote: " << remote.address << ":" << remote.port << " " << remote.type
-				     << " " << remote.transportType << endl;
+				cout << "Local: " << local << endl;
+				cout << "Remote: " << remote << endl;
 				cout << "Bytes Sent:" << pc->bytesSent()
 				     << " / Bytes Received:" << pc->bytesReceived() << " / Round-Trip Time:";
 				if (rtt.has_value())

examples/copy-paste/offerer.cpp

@@ -127,13 +127,11 @@ int main(int argc, char **argv) {
 				cout << "** Channel is not Open ** ";
 				break;
 			}
-			CandidateInfo local, remote;
+			Candidate local, remote;
 			std::optional<std::chrono::milliseconds> rtt = pc->rtt();
 			if (pc->getSelectedCandidatePair(&local, &remote)) {
-				cout << "Local: " << local.address << ":" << local.port << " " << local.type << " "
-				     << local.transportType << endl;
-				cout << "Remote: " << remote.address << ":" << remote.port << " " << remote.type
-				     << " " << remote.transportType << endl;
+				cout << "Local: " << local << endl;
+				cout << "Remote: " << remote << endl;
 				cout << "Bytes Sent:" << pc->bytesSent()
 				     << " / Bytes Received:" << pc->bytesReceived() << " / Round-Trip Time:";
 				if (rtt.has_value())

examples/media/CMakeLists.txt

@@ -4,11 +4,5 @@ add_executable(datachannel-media main.cpp)
 set_target_properties(datachannel-media PROPERTIES
         CXX_STANDARD 17
         OUTPUT_NAME media)
+target_link_libraries(datachannel-media datachannel nlohmann_json)
 
-if(WIN32)
-    target_link_libraries(datachannel-media datachannel-static) # DLL exports only the C API
-else()
-    target_link_libraries(datachannel-media datachannel)
-endif()
-
-target_link_libraries(datachannel-media datachannel nlohmann_json)

examples/media/main.cpp

@@ -1,6 +1,6 @@
 /*
  * libdatachannel client example
- * Copyright (c) 2020 Staz M
+ * Copyright (c) 2020 Staz Modrzynski
  * Copyright (c) 2020 Paul-Louis Ageneau
  *
  * This program is free software; you can redistribute it and/or
@@ -67,7 +67,7 @@ int main() {
 
 		auto track = pc->addTrack(media);
 
-		auto session = std::make_shared<rtc::RtcpSession>();
+		auto session = std::make_shared<rtc::RtcpReceivingSession>();
 		track->setRtcpHandler(session);
 
 		track->onMessage(

examples/sfu-media/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.7)
+
+add_executable(datachannel-sfu-media main.cpp)
+set_target_properties(datachannel-sfu-media PROPERTIES
+		CXX_STANDARD 17
+		OUTPUT_NAME sfu-media)
+target_link_libraries(datachannel-sfu-media datachannel nlohmann_json)
+

examples/sfu-media/main.cpp

@@ -0,0 +1,134 @@
+/*
+ * libdatachannel client example
+ * Copyright (c) 2020 Staz Modrzynski
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define _WINSOCK_DEPRECATED_NO_WARNINGS
+
+#include "rtc/rtc.hpp"
+
+#include <iostream>
+#include <memory>
+
+#include <nlohmann/json.hpp>
+
+using nlohmann::json;
+
+struct Receiver {
+	std::shared_ptr<rtc::PeerConnection> conn;
+	std::shared_ptr<rtc::Track> track;
+};
+int main() {
+	std::vector<std::shared_ptr<Receiver>> receivers;
+
+	try {
+		rtc::InitLogger(rtc::LogLevel::Info);
+
+		auto pc = std::make_shared<rtc::PeerConnection>();
+		pc->onStateChange(
+		    [](rtc::PeerConnection::State state) { std::cout << "State: " << state << std::endl; });
+		pc->onGatheringStateChange([pc](rtc::PeerConnection::GatheringState state) {
+			std::cout << "Gathering State: " << state << std::endl;
+			if (state == rtc::PeerConnection::GatheringState::Complete) {
+				auto description = pc->localDescription();
+				json message = {{"type", description->typeString()},
+				                {"sdp", std::string(description.value())}};
+				std::cout << "Please copy/paste this offer to the SENDER: " << message << std::endl;
+			}
+		});
+
+		rtc::Description::Video media("video", rtc::Description::Direction::RecvOnly);
+		media.addH264Codec(96);
+		media.setBitrate(
+		    3000); // Request 3Mbps (Browsers do not encode more than 2.5MBps from a webcam)
+
+		auto track = pc->addTrack(media);
+		pc->setLocalDescription();
+
+		auto session = std::make_shared<rtc::RtcpReceivingSession>();
+		track->setRtcpHandler(session);
+
+		const rtc::SSRC targetSSRC = 4;
+
+		track->onMessage(
+		    [&receivers, targetSSRC](rtc::binary message) {
+			    // This is an RTP packet
+			    auto rtp = (rtc::RTP *)message.data();
+			    rtp->setSsrc(targetSSRC);
+			    for (auto pc : receivers) {
+				    if (pc->track != nullptr && pc->track->isOpen()) {
+					    pc->track->send(message);
+				    }
+			    }
+		    },
+		    nullptr);
+
+		// Set the SENDERS Answer
+		{
+			std::cout << "Please copy/paste the answer provided by the SENDER: " << std::endl;
+			std::string sdp;
+			std::getline(std::cin, sdp);
+			std::cout << "Got answer" << sdp << std::endl;
+			json j = json::parse(sdp);
+			rtc::Description answer(j["sdp"].get<std::string>(), j["type"].get<std::string>());
+			pc->setRemoteDescription(answer);
+		}
+
+		// For each receiver
+		while (true) {
+			auto pc = std::make_shared<Receiver>();
+			pc->conn = std::make_shared<rtc::PeerConnection>();
+			pc->conn->onStateChange([](rtc::PeerConnection::State state) {
+				std::cout << "State: " << state << std::endl;
+			});
+			pc->conn->onGatheringStateChange([pc](rtc::PeerConnection::GatheringState state) {
+				std::cout << "Gathering State: " << state << std::endl;
+				if (state == rtc::PeerConnection::GatheringState::Complete) {
+					auto description = pc->conn->localDescription();
+					json message = {{"type", description->typeString()},
+					                {"sdp", std::string(description.value())}};
+					std::cout << "Please copy/paste this offer to the RECEIVER: " << message
+					          << std::endl;
+				}
+			});
+			rtc::Description::Video media("video", rtc::Description::Direction::SendOnly);
+			media.addH264Codec(96);
+			media.setBitrate(
+			    3000); // Request 3Mbps (Browsers do not encode more than 2.5MBps from a webcam)
+
+			media.addSSRC(targetSSRC, "video-send");
+
+			pc->track = pc->conn->addTrack(media);
+			pc->conn->setLocalDescription();
+
+			pc->track->onMessage([](rtc::binary var) {}, nullptr);
+
+			std::cout << "Please copy/paste the answer provided by the RECEIVER: " << std::endl;
+			std::string sdp;
+			std::getline(std::cin, sdp);
+			std::cout << "Got answer" << sdp << std::endl;
+			json j = json::parse(sdp);
+			rtc::Description answer(j["sdp"].get<std::string>(), j["type"].get<std::string>());
+			pc->conn->setRemoteDescription(answer);
+
+			receivers.push_back(pc);
+		}
+
+	} catch (const std::exception &e) {
+		std::cerr << "Error: " << e.what() << std::endl;
+	}
+}

examples/sfu-media/main.html

@@ -0,0 +1,87 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>libdatachannel media example</title>
+</head>
+<body>
+
+<div style="display:inline-block; width:40%;">
+    <h1>SENDER</h1>
+    <p id="send-help">Please enter the offer provided to you by the application: </p>
+    <textarea style="width:100%;" id=send-text rows="50"></textarea>
+    <button id=send-btn>Submit</button>
+</div>
+<div style="display:inline-block; width:40%;">
+    <h1>RECEIVER</h1>
+    <p id="recv-help">Please enter the offer provided to you by the application: </p>
+    <textarea id=recv-text style="width:100%;" rows="50"></textarea>
+    <button id=recv-btn>Submit</button>
+</div>
+<div id="videos">
+
+</div>
+<script>
+    document.querySelector('#send-btn').addEventListener('click',  async () => {
+        let offer = JSON.parse(document.querySelector('#send-text').value);
+        rtc = new RTCPeerConnection({
+            // Recommended for libdatachannel
+            bundlePolicy: "max-bundle",
+        });
+
+        rtc.onicegatheringstatechange = (state) => {
+            if (rtc.iceGatheringState === 'complete') {
+                // We only want to provide an answer once all of our candidates have been added to the SDP.
+                let answer = rtc.localDescription;
+                document.querySelector('#send-text').value = JSON.stringify({"type": answer.type, sdp: answer.sdp});
+                document.querySelector('#send-help').value = 'Please paste the answer in the application.';
+                alert('Please paste the answer in the application.');
+            }
+        }
+        await rtc.setRemoteDescription(offer);
+
+        let media = await navigator.mediaDevices.getUserMedia({
+            video: {
+                width: 1280,
+                height: 720
+            }
+        });
+        media.getTracks().forEach(track => rtc.addTrack(track, media));
+        let answer = await rtc.createAnswer();
+        await rtc.setLocalDescription(answer);
+    });
+
+    document.querySelector('#recv-btn').addEventListener('click',  async () => {
+        let offer = JSON.parse(document.querySelector('#recv-text').value);
+        rtc = new RTCPeerConnection({
+            // Recommended for libdatachannel
+            bundlePolicy: "max-bundle",
+        });
+
+        rtc.onicegatheringstatechange = (state) => {
+            if (rtc.iceGatheringState === 'complete') {
+                // We only want to provide an answer once all of our candidates have been added to the SDP.
+                let answer = rtc.localDescription;
+                document.querySelector('#recv-text').value = JSON.stringify({"type": answer.type, sdp: answer.sdp});
+                document.querySelector('#recv-help').value = 'Please paste the answer in the application.';
+                alert('Please paste the answer in the application.');
+            }
+        }
+        let trackCount = 0;
+        rtc.ontrack = (ev) => {
+            let thisID = trackCount++;
+
+            document.querySelector("#videos").innerHTML += "<video width=100% height=100% id='video-" + thisID + "'></video>";
+            let tracks = [];
+            rtc.getReceivers().forEach(recv => tracks.push(recv.track));
+            document.querySelector("#video-" + thisID).srcObject = new MediaStream(tracks);
+            document.querySelector("#video-" + thisID).play();
+        };
+        await rtc.setRemoteDescription(offer);
+        let answer = await rtc.createAnswer();
+        await rtc.setLocalDescription(answer);
+    });
+</script>
+
+</body>
+</html>

examples/web/script.js

@@ -55,10 +55,11 @@ function openSignaling(url) {
     const ws = new WebSocket(url);
     ws.onopen = () => resolve(ws);
     ws.onerror = () => reject(new Error('WebSocket error'));
-    ws.onclosed = () => console.error('WebSocket disconnected');
+    ws.onclose = () => console.error('WebSocket disconnected');
     ws.onmessage = (e) => {
       if(typeof(e.data) != 'string') return;
       const message = JSON.parse(e.data);
+      console.log(message);
       const { id, type } = message;
 
       let pc = peerConnectionMap[id];

include/rtc/candidate.hpp

@@ -25,38 +25,59 @@
 
 namespace rtc {
 
-enum class CandidateType { Host = 0, ServerReflexive, PeerReflexive, Relayed };
-enum class CandidateTransportType { Udp = 0, TcpActive, TcpPassive, TcpSo };
-struct CandidateInfo {
-	string address;
-	int port;
-	CandidateType type;
-	CandidateTransportType transportType;
-};
-
-class Candidate {
+class RTC_CPP_EXPORT Candidate {
 public:
-	Candidate(string candidate, string mid = "");
+	enum class Family { Unresolved, Ipv4, Ipv6 };
+	enum class Type { Unknown, Host, ServerReflexive, PeerReflexive, Relayed };
+	enum class TransportType { Unknown, Udp, TcpActive, TcpPassive, TcpSo, TcpUnknown };
+
+	Candidate();
+	Candidate(string candidate);
+	Candidate(string candidate, string mid);
+
+	void hintMid(string mid);
 
 	enum class ResolveMode { Simple, Lookup };
 	bool resolve(ResolveMode mode = ResolveMode::Simple);
-	bool isResolved() const;
 
+	Type type() const;
+	TransportType transportType() const;
+	uint32_t priority() const;
 	string candidate() const;
 	string mid() const;
 	operator string() const;
 
+	bool operator==(const Candidate &other) const;
+	bool operator!=(const Candidate &other) const;
+
+	bool isResolved() const;
+	Family family() const;
+	std::optional<string> address() const;
+	std::optional<uint16_t> port() const;
+
 private:
-	string mCandidate;
-	string mMid;
-	bool mIsResolved;
+	void parse(string candidate);
+
+	string mFoundation;
+	uint32_t mComponent, mPriority;
+	string mTypeString, mTransportString;
+	Type mType;
+	TransportType mTransportType;
+	string mNode, mService;
+	string mTail;
+
+	std::optional<string> mMid;
+
+	// Extracted on resolution
+	Family mFamily;
+	string mAddress;
+	uint16_t mPort;
 };
 
 } // namespace rtc
 
-std::ostream &operator<<(std::ostream &out, const rtc::Candidate &candidate);
-std::ostream &operator<<(std::ostream &out, const rtc::CandidateType &type);
-std::ostream &operator<<(std::ostream &out, const rtc::CandidateTransportType &transportType);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, const rtc::Candidate &candidate);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, const rtc::Candidate::Type &type);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, const rtc::Candidate::TransportType &transportType);
 
 #endif
-

include/rtc/channel.hpp

@@ -28,13 +28,14 @@
 
 namespace rtc {
 
-class Channel {
+class RTC_CPP_EXPORT Channel {
 public:
 	Channel() = default;
 	virtual ~Channel() = default;
 
 	virtual void close() = 0;
 	virtual bool send(message_variant data) = 0; // returns false if buffered
+	virtual bool send(const byte *data, size_t size) = 0;
 
 	virtual bool isOpen() const = 0;
 	virtual bool isClosed() const = 0;
@@ -54,7 +55,8 @@ public:
 
 	// Extended API
 	virtual std::optional<message_variant> receive() = 0; // only if onMessage unset
-	virtual size_t availableAmount() const; // total size available to receive
+	virtual std::optional<message_variant> peek() = 0;    // only if onMessage unset
+	virtual size_t availableAmount() const;               // total size available to receive
 	void onAvailable(std::function<void()> callback);
 
 protected:
@@ -81,4 +83,3 @@ private:
 } // namespace rtc
 
 #endif // RTC_CHANNEL_H
-

include/rtc/configuration.hpp

@@ -26,7 +26,7 @@
 
 namespace rtc {
 
-struct IceServer {
+struct RTC_CPP_EXPORT IceServer {
 	enum class Type { Stun, Turn };
 	enum class RelayType { TurnUdp, TurnTcp, TurnTls };
 
@@ -51,7 +51,7 @@ struct IceServer {
 	RelayType relayType;
 };
 
-struct ProxyServer {
+struct RTC_CPP_EXPORT ProxyServer {
 	enum class Type { None = 0, Socks5, Http, Last = Http };
 
 	ProxyServer(Type type_, string ip_, uint16_t port_, string username_ = "",
@@ -64,7 +64,7 @@ struct ProxyServer {
 	string password;
 };
 
-struct Configuration {
+struct RTC_CPP_EXPORT Configuration {
 	std::vector<IceServer> iceServers;
 	std::optional<ProxyServer> proxyServer;
 	bool enableIceTcp = false;

include/rtc/datachannel.hpp

@@ -36,22 +36,21 @@ namespace rtc {
 class SctpTransport;
 class PeerConnection;
 
-class DataChannel final : public std::enable_shared_from_this<DataChannel>, public Channel {
+class RTC_CPP_EXPORT DataChannel : public std::enable_shared_from_this<DataChannel>, public Channel {
 public:
-	DataChannel(std::weak_ptr<PeerConnection> pc, unsigned int stream, string label,
-	            string protocol, Reliability reliability);
-	DataChannel(std::weak_ptr<PeerConnection> pc, std::weak_ptr<SctpTransport> transport,
-	            unsigned int stream);
-	~DataChannel();
+	DataChannel(std::weak_ptr<PeerConnection> pc, uint16_t stream, string label, string protocol,
+	            Reliability reliability);
+	virtual ~DataChannel();
 
-	unsigned int stream() const;
+	uint16_t stream() const;
+	uint16_t id() const;
 	string label() const;
 	string protocol() const;
 	Reliability reliability() const;
 
 	void close(void) override;
 	bool send(message_variant data) override;
-	bool send(const byte *data, size_t size);
+	bool send(const byte *data, size_t size) override;
 	template <typename Buffer> bool sendBuffer(const Buffer &buf);
 	template <typename Iterator> bool sendBuffer(Iterator first, Iterator last);
 
@@ -62,18 +61,19 @@ public:
 	// Extended API
 	size_t availableAmount() const override;
 	std::optional<message_variant> receive() override;
+	std::optional<message_variant> peek() override;
 
-private:
+protected:
+	virtual void open(std::shared_ptr<SctpTransport> transport);
+	virtual void processOpenMessage(message_ptr message);
 	void remoteClose();
-	void open(std::shared_ptr<SctpTransport> transport);
 	bool outgoing(message_ptr message);
 	void incoming(message_ptr message);
-	void processOpenMessage(message_ptr message);
 
 	const std::weak_ptr<PeerConnection> mPeerConnection;
 	std::weak_ptr<SctpTransport> mSctpTransport;
 
-	unsigned int mStream;
+	uint16_t mStream;
 	string mLabel;
 	string mProtocol;
 	std::shared_ptr<Reliability> mReliability;
@@ -81,11 +81,27 @@ private:
 	std::atomic<bool> mIsOpen = false;
 	std::atomic<bool> mIsClosed = false;
 
+private:
 	Queue<message_ptr> mRecvQueue;
 
 	friend class PeerConnection;
 };
 
+class RTC_CPP_EXPORT NegociatedDataChannel final : public DataChannel {
+public:
+	NegociatedDataChannel(std::weak_ptr<PeerConnection> pc, uint16_t stream, string label,
+	                      string protocol, Reliability reliability);
+	NegociatedDataChannel(std::weak_ptr<PeerConnection> pc, std::weak_ptr<SctpTransport> transport,
+	                      uint16_t stream);
+	~NegociatedDataChannel();
+
+private:
+	void open(std::shared_ptr<SctpTransport> transport) override;
+	void processOpenMessage(message_ptr message) override;
+
+	friend class PeerConnection;
+};
+
 template <typename Buffer> std::pair<const byte *, size_t> to_bytes(const Buffer &buf) {
 	using T = typename std::remove_pointer<decltype(buf.data())>::type;
 	using E = typename std::conditional<std::is_void<T>::value, byte, T>::type;

include/rtc/description.hpp

@@ -1,6 +1,6 @@
 /**
  * Copyright (c) 2019-2020 Paul-Louis Ageneau
- * Copyright (c) 2020 Staz M
+ * Copyright (c) 2020 Staz Modrzynski
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -32,30 +32,39 @@
 
 namespace rtc {
 
-class Description {
+const string DEFAULT_AUDIO_PROFILE =
+    "minptime=10;maxaveragebitrate=96000;stereo=1;sprop-stereo=1;useinbandfec=1";
+
+// Use Constrained Baseline profile Level 4.2 (necessary for Firefox)
+// https://developer.mozilla.org/en-US/docs/Web/Media/Formats/WebRTC_codecs#Supported_video_codecs
+// TODO: Should be 42E0 but 42C0 appears to be more compatible. Investigate this.
+const string DEFAULT_VIDEO_PROFILE =
+    "profile-level-id=42e01f;packetization-mode=1;level-asymmetry-allowed=1";
+
+class RTC_CPP_EXPORT Description {
 public:
-	enum class Type { Unspec = 0, Offer = 1, Answer = 2 };
-	enum class Role { ActPass = 0, Passive = 1, Active = 2 };
+	enum class Type { Unspec, Offer, Answer, Pranswer, Rollback };
+	enum class Role { ActPass, Passive, Active };
 	enum class Direction { SendOnly, RecvOnly, SendRecv, Inactive, Unknown };
 
-	Description(const string &sdp, const string &typeString = "");
-	Description(const string &sdp, Type type);
-	Description(const string &sdp, Type type, Role role);
+	Description(const string &sdp, Type type = Type::Unspec, Role role = Role::ActPass);
+	Description(const string &sdp, string typeString);
 
 	Type type() const;
 	string typeString() const;
 	Role role() const;
-	string roleString() const;
 	string bundleMid() const;
-	string iceUfrag() const;
-	string icePwd() const;
+	std::optional<string> iceUfrag() const;
+	std::optional<string> icePwd() const;
 	std::optional<string> fingerprint() const;
 	bool ended() const;
 
 	void hintType(Type type);
 	void setFingerprint(string fingerprint);
 
+	bool hasCandidate(const Candidate &candidate) const;
 	void addCandidate(Candidate candidate);
+	void addCandidates(std::vector<Candidate> candidates);
 	void endCandidates();
 	std::vector<Candidate> extractCandidates();
 
@@ -63,7 +72,7 @@ public:
 	string generateSdp(string_view eol) const;
 	string generateApplicationSdp(string_view eol) const;
 
-	class Entry {
+	class RTC_CPP_EXPORT Entry {
 	public:
 		virtual ~Entry() = default;
 
@@ -74,10 +83,14 @@ public:
 		void setDirection(Direction dir);
 
 		operator string() const;
-		string generateSdp(string_view eol) const;
+		string generateSdp(string_view eol, string_view addr, string_view port) const;
 
 		virtual void parseSdpLine(string_view line);
 
+		std::vector<string>::iterator beginAttributes();
+		std::vector<string>::iterator endAttributes();
+		std::vector<string>::iterator removeAttribute(std::vector<string>::iterator iterator);
+
 	protected:
 		Entry(const string &mline, string mid, Direction dir = Direction::Unknown);
 		virtual string generateSdpLines(string_view eol) const;
@@ -91,11 +104,10 @@ public:
 		Direction mDirection;
 	};
 
-	struct Application : public Entry {
+	struct RTC_CPP_EXPORT Application : public Entry {
 	public:
 		Application(string mid = "data");
-		Application(const Application &other) = default;
-		Application(Application &&other) = default;
+		virtual ~Application() = default;
 
 		string description() const override;
 		Application reciprocate() const;
@@ -117,12 +129,10 @@ public:
 	};
 
 	// Media (non-data)
-	class Media : public Entry {
+	class RTC_CPP_EXPORT Media : public Entry {
 	public:
 		Media(const string &sdp);
 		Media(const string &mline, string mid, Direction dir = Direction::SendOnly);
-		Media(const Media &other) = default;
-		Media(Media &&other) = default;
 		virtual ~Media() = default;
 
 		string description() const override;
@@ -130,28 +140,30 @@ public:
 
 		void removeFormat(const string &fmt);
 
-		void addVideoCodec(int payloadType, const string &codec);
-		void addH264Codec(int payloadType);
-		void addVP8Codec(int payloadType);
-		void addVP9Codec(int payloadType);
+		void addSSRC(uint32_t ssrc, std::optional<string> name,
+		             std::optional<string> msid = nullopt);
+		void replaceSSRC(uint32_t oldSSRC, uint32_t ssrc, std::optional<string> name,
+		                 std::optional<string> msid = nullopt);
+		bool hasSSRC(uint32_t ssrc);
+		std::vector<uint32_t> getSSRCs();
 
 		void setBitrate(int bitrate);
 		int getBitrate() const;
 
 		bool hasPayloadType(int payloadType) const;
 
+		void addRTXCodec(unsigned int payloadType, unsigned int originalPayloadType,
+		                 unsigned int clockRate);
+
 		virtual void parseSdpLine(string_view line) override;
 
-	private:
-		virtual string generateSdpLines(string_view eol) const override;
-
-		int mBas = -1;
-
 		struct RTPMap {
 			RTPMap(string_view mline);
+			RTPMap() {}
 
 			void removeFB(const string &string);
 			void addFB(const string &string);
+			void addAttribute(string attr) { fmtps.emplace_back(std::move(attr)); }
 
 			int pt;
 			string format;
@@ -160,26 +172,57 @@ public:
 
 			std::vector<string> rtcpFbs;
 			std::vector<string> fmtps;
+
+			static int parsePT(string_view view);
+			void setMLine(string_view view);
 		};
 
+		std::map<int, RTPMap>::iterator beginMaps();
+		std::map<int, RTPMap>::iterator endMaps();
+		std::map<int, RTPMap>::iterator removeMap(std::map<int, RTPMap>::iterator iterator);
+
+	private:
+		virtual string generateSdpLines(string_view eol) const override;
+
+		int mBas = -1;
+
 		Media::RTPMap &getFormat(int fmt);
 		Media::RTPMap &getFormat(const string &fmt);
 
 		std::map<int, RTPMap> mRtpMap;
+		std::vector<uint32_t> mSsrcs;
+
+	public:
+		void addRTPMap(const RTPMap &map);
+
+		void removeSSRC(uint32_t oldSSRC);
 	};
 
-	class Audio : public Media {
+	class RTC_CPP_EXPORT Audio : public Media {
 	public:
 		Audio(string mid = "audio", Direction dir = Direction::SendOnly);
+
+		void addAudioCodec(int payloadType, string codec,
+		                   std::optional<string> profile = DEFAULT_AUDIO_PROFILE);
+
+		void addOpusCodec(int payloadType);
 	};
 
-	class Video : public Media {
+	class RTC_CPP_EXPORT Video : public Media {
 	public:
 		Video(string mid = "video", Direction dir = Direction::SendOnly);
+
+		void addVideoCodec(int payloadType, string codec,
+		                   std::optional<string> profile = DEFAULT_VIDEO_PROFILE);
+
+		void addH264Codec(int payloadType);
+		void addVP8Codec(int payloadType);
+		void addVP9Codec(int payloadType);
 	};
 
 	bool hasApplication() const;
 	bool hasAudioOrVideo() const;
+	bool hasMid(string_view mid) const;
 
 	int addMedia(Media media);
 	int addMedia(Application application);
@@ -187,13 +230,17 @@ public:
 	int addVideo(string mid = "video", Direction dir = Direction::SendOnly);
 	int addAudio(string mid = "audio", Direction dir = Direction::SendOnly);
 
-	std::variant<Media *, Application *> media(int index);
-	std::variant<const Media *, const Application *> media(int index) const;
-	int mediaCount() const;
+	std::variant<Media *, Application *> media(unsigned int index);
+	std::variant<const Media *, const Application *> media(unsigned int index) const;
+	unsigned int mediaCount() const;
 
 	Application *application();
 
+	static Type stringToType(const string &typeString);
+	static string typeToString(Type type);
+
 private:
+	std::optional<Candidate> defaultCandidate() const;
 	std::shared_ptr<Entry> createEntry(string mline, string mid, Direction dir);
 	void removeApplication();
 
@@ -201,8 +248,9 @@ private:
 
 	// Session-level attributes
 	Role mRole;
+	string mUsername;
 	string mSessionId;
-	string mIceUfrag, mIcePwd;
+	std::optional<string> mIceUfrag, mIcePwd;
 	std::optional<string> mFingerprint;
 
 	// Entries
@@ -212,14 +260,12 @@ private:
 	// Candidates
 	std::vector<Candidate> mCandidates;
 	bool mEnded = false;
-
-	static Type stringToType(const string &typeString);
-	static string typeToString(Type type);
-	static string roleToString(Role role);
 };
 
 } // namespace rtc
 
-std::ostream &operator<<(std::ostream &out, const rtc::Description &description);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, const rtc::Description &description);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, rtc::Description::Type type);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, rtc::Description::Role role);
 
 #endif

include/rtc/include.hpp

@@ -28,9 +28,15 @@
 #endif
 
 #ifdef _WIN32
+#define RTC_CPP_EXPORT __declspec(dllexport)
 #ifndef _WIN32_WINNT
-#define _WIN32_WINNT 0x0602
+#define _WIN32_WINNT 0x0602 // Windows 8
 #endif
+#ifdef _MSC_VER
+#pragma warning(disable:4251) // disable "X needs to have dll-interface..."
+#endif
+#else
+#define RTC_CPP_EXPORT
 #endif
 
 #include "log.hpp"
@@ -62,7 +68,7 @@ using std::uint8_t;
 const size_t MAX_NUMERICNODE_LEN = 48; // Max IPv6 string representation length
 const size_t MAX_NUMERICSERV_LEN = 6;  // Max port string representation length
 
-const uint16_t DEFAULT_SCTP_PORT = 5000; // SCTP port to use by default
+const uint16_t DEFAULT_SCTP_PORT = 5000;          // SCTP port to use by default
 const size_t DEFAULT_MAX_MESSAGE_SIZE = 65536;    // Remote max message size if not specified in SDP
 const size_t LOCAL_MAX_MESSAGE_SIZE = 256 * 1024; // Local max message size
 
@@ -72,7 +78,7 @@ const int THREADPOOL_SIZE = 4; // Number of threads in the global thread pool
 
 // overloaded helper
 template <class... Ts> struct overloaded : Ts... { using Ts::operator()...; };
-template <class... Ts> overloaded(Ts...)->overloaded<Ts...>;
+template <class... Ts> overloaded(Ts...) -> overloaded<Ts...>;
 
 // weak_ptr bind helper
 template <typename F, typename T, typename... Args> auto weak_bind(F &&f, T *t, Args &&... _args) {
@@ -85,12 +91,29 @@ template <typename F, typename T, typename... Args> auto weak_bind(F &&f, T *t,
 	};
 }
 
-template <typename... P> class synchronized_callback {
+// scope_guard helper
+class scope_guard {
+public:
+	scope_guard(std::function<void()> func) : function(std::move(func)) {}
+	scope_guard(scope_guard &&other) = delete;
+	scope_guard(const scope_guard &) = delete;
+	void operator=(const scope_guard &) = delete;
+
+	~scope_guard() {
+		if (function)
+			function();
+	}
+
+private:
+	std::function<void()> function;
+};
+
+template <typename... Args> class synchronized_callback {
 public:
 	synchronized_callback() = default;
 	synchronized_callback(synchronized_callback &&cb) { *this = std::move(cb); }
 	synchronized_callback(const synchronized_callback &cb) { *this = cb; }
-	synchronized_callback(std::function<void(P...)> func) { *this = std::move(func); }
+	synchronized_callback(std::function<void(Args...)> func) { *this = std::move(func); }
 	~synchronized_callback() { *this = nullptr; }
 
 	synchronized_callback &operator=(synchronized_callback &&cb) {
@@ -106,16 +129,16 @@ public:
 		return *this;
 	}
 
-	synchronized_callback &operator=(std::function<void(P...)> func) {
+	synchronized_callback &operator=(std::function<void(Args...)> func) {
 		std::lock_guard lock(mutex);
 		callback = std::move(func);
 		return *this;
 	}
 
-	void operator()(P... args) const {
+	void operator()(Args... args) const {
 		std::lock_guard lock(mutex);
 		if (callback)
-			callback(args...);
+			callback(std::move(args)...);
 	}
 
 	operator bool() const {
@@ -123,10 +146,14 @@ public:
 		return callback ? true : false;
 	}
 
+	std::function<void(Args...)> wrap() const {
+		return [this](Args... args) { (*this)(std::move(args)...); };
+	}
+
 private:
-	std::function<void(P...)> callback;
+	std::function<void(Args...)> callback;
 	mutable std::recursive_mutex mutex;
 };
-}
+} // namespace rtc
 
 #endif

include/rtc/init.hpp

@@ -27,7 +27,7 @@ namespace rtc {
 
 using init_token = std::shared_ptr<void>;
 
-class Init {
+class RTC_CPP_EXPORT Init {
 public:
 	static init_token Token();
 	static void Preload();

include/rtc/log.hpp

@@ -35,6 +35,8 @@
 #pragma warning(pop)
 #endif
 
+#include "include.hpp"
+
 namespace rtc {
 
 enum class LogLevel { // Don't change, it must match plog severity
@@ -47,8 +49,8 @@ enum class LogLevel { // Don't change, it must match plog severity
 	Verbose = 6
 };
 
-void InitLogger(LogLevel level);
-void InitLogger(plog::Severity severity, plog::IAppender *appender = nullptr);
-}
+RTC_CPP_EXPORT void InitLogger(LogLevel level);
+RTC_CPP_EXPORT void InitLogger(plog::Severity severity, plog::IAppender *appender = nullptr);
+} // namespace rtc
 
 #endif

include/rtc/message.hpp

@@ -29,7 +29,7 @@
 
 namespace rtc {
 
-struct Message : binary {
+struct RTC_CPP_EXPORT Message : binary {
 	enum Type { Binary, String, Control, Reset };
 
 	Message(const Message &message) = default;
@@ -42,7 +42,8 @@ struct Message : binary {
 	Message(binary &&data, Type type_ = Binary) : binary(std::move(data)), type(type_) {}
 
 	Type type;
-	unsigned int stream = 0;
+	unsigned int stream = 0; // Stream id (SCTP stream or SSRC)
+	unsigned int dscp = 0;   // Differentiated Services Code Point
 	std::shared_ptr<Reliability> reliability;
 };
 

include/rtc/peerconnection.hpp

@@ -50,7 +50,14 @@ class SctpTransport;
 using certificate_ptr = std::shared_ptr<Certificate>;
 using future_certificate_ptr = std::shared_future<certificate_ptr>;
 
-class PeerConnection final : public std::enable_shared_from_this<PeerConnection> {
+struct RTC_CPP_EXPORT DataChannelInit {
+	Reliability reliability = {};
+	bool negotiated = false;
+	std::optional<uint16_t> id = nullopt;
+	string protocol = "";
+};
+
+class RTC_CPP_EXPORT PeerConnection final : public std::enable_shared_from_this<PeerConnection> {
 public:
 	enum class State : int {
 		New = RTC_NEW,
@@ -67,7 +74,15 @@ public:
 		Complete = RTC_GATHERING_COMPLETE
 	};
 
-	PeerConnection(void);
+	enum class SignalingState : int {
+		Stable = RTC_SIGNALING_STABLE,
+		HaveLocalOffer = RTC_SIGNALING_HAVE_LOCAL_OFFER,
+		HaveRemoteOffer = RTC_SIGNALING_HAVE_REMOTE_OFFER,
+		HaveLocalPranswer = RTC_SIGNALING_HAVE_LOCAL_PRANSWER,
+		HaveRemotePranswer = RTC_SIGNALING_HAVE_REMOTE_PRANSWER,
+	} rtcSignalingState;
+
+	PeerConnection();
 	PeerConnection(const Configuration &config);
 	~PeerConnection();
 
@@ -76,6 +91,7 @@ public:
 	const Configuration *config() const;
 	State state() const;
 	GatheringState gatheringState() const;
+	SignalingState signalingState() const;
 	bool hasLocalDescription() const;
 	bool hasRemoteDescription() const;
 	bool hasMedia() const;
@@ -83,23 +99,24 @@ public:
 	std::optional<Description> remoteDescription() const;
 	std::optional<string> localAddress() const;
 	std::optional<string> remoteAddress() const;
+	bool getSelectedCandidatePair(Candidate *local, Candidate *remote);
+
+	void setLocalDescription(Description::Type type = Description::Type::Unspec);
 
-	void setLocalDescription();
 	void setRemoteDescription(Description description);
 	void addRemoteCandidate(Candidate candidate);
 
-	std::shared_ptr<DataChannel> addDataChannel(string label, string protocol = "",
-	                                            Reliability reliability = {});
+	std::shared_ptr<DataChannel> addDataChannel(string label, DataChannelInit init = {});
 
 	// Equivalent to calling addDataChannel() and setLocalDescription()
-	std::shared_ptr<DataChannel> createDataChannel(string label, string protocol = "",
-	                                               Reliability reliability = {});
+	std::shared_ptr<DataChannel> createDataChannel(string label, DataChannelInit init = {});
 
 	void onDataChannel(std::function<void(std::shared_ptr<DataChannel> dataChannel)> callback);
 	void onLocalDescription(std::function<void(Description description)> callback);
 	void onLocalCandidate(std::function<void(Candidate candidate)> callback);
 	void onStateChange(std::function<void(State state)> callback);
 	void onGatheringStateChange(std::function<void(GatheringState state)> callback);
+	void onSignalingStateChange(std::function<void(SignalingState state)> callback);
 
 	// Stats
 	void clearStats();
@@ -111,11 +128,8 @@ public:
 	std::shared_ptr<Track> addTrack(Description::Media description);
 	void onTrack(std::function<void(std::shared_ptr<Track> track)> callback);
 
-	// libnice only
-	bool getSelectedCandidatePair(CandidateInfo *local, CandidateInfo *remote);
-
 private:
-	std::shared_ptr<IceTransport> initIceTransport(Description::Role role);
+	std::shared_ptr<IceTransport> initIceTransport();
 	std::shared_ptr<DtlsTransport> initDtlsTransport();
 	std::shared_ptr<SctpTransport> initSctpTransport();
 	void closeTransports();
@@ -125,9 +139,10 @@ private:
 	void forwardMessage(message_ptr message);
 	void forwardMedia(message_ptr message);
 	void forwardBufferedAmount(uint16_t stream, size_t amount);
+	std::optional<std::string> getMidFromSsrc(uint32_t ssrc);
 
 	std::shared_ptr<DataChannel> emplaceDataChannel(Description::Role role, string label,
-	                                                string protocol, Reliability reliability);
+	                                                DataChannelInit init);
 	std::shared_ptr<DataChannel> findDataChannel(uint16_t stream);
 	void iterateDataChannels(std::function<void(std::shared_ptr<DataChannel> channel)> func);
 	void openDataChannels();
@@ -137,12 +152,18 @@ private:
 	void incomingTrack(Description::Media description);
 	void openTracks();
 
+	void validateRemoteDescription(const Description &description);
 	void processLocalDescription(Description description);
 	void processLocalCandidate(Candidate candidate);
+	void processRemoteDescription(Description description);
+	void processRemoteCandidate(Candidate candidate);
+	string localBundleMid() const;
+
 	void triggerDataChannel(std::weak_ptr<DataChannel> weakDataChannel);
 	void triggerTrack(std::shared_ptr<Track> track);
 	bool changeState(State state);
 	bool changeGatheringState(GatheringState state);
+	bool changeSignalingState(SignalingState state);
 
 	void resetCallbacks();
 
@@ -154,32 +175,38 @@ private:
 	const std::unique_ptr<Processor> mProcessor;
 
 	std::optional<Description> mLocalDescription, mRemoteDescription;
+	std::optional<Description> mCurrentLocalDescription;
 	mutable std::mutex mLocalDescriptionMutex, mRemoteDescriptionMutex;
 
 	std::shared_ptr<IceTransport> mIceTransport;
 	std::shared_ptr<DtlsTransport> mDtlsTransport;
 	std::shared_ptr<SctpTransport> mSctpTransport;
 
-	std::unordered_map<unsigned int, std::weak_ptr<DataChannel>> mDataChannels; // by stream ID
-	std::unordered_map<string, std::weak_ptr<Track>> mTracks;                   // by mid
+	std::unordered_map<uint16_t, std::weak_ptr<DataChannel>> mDataChannels; // by stream ID
+	std::unordered_map<string, std::weak_ptr<Track>> mTracks;               // by mid
+	std::vector<std::weak_ptr<Track>> mTrackLines;                          // by SDP order
 	std::shared_mutex mDataChannelsMutex, mTracksMutex;
 
-	std::unordered_map<unsigned int, string> mMidFromPayloadType; // cache
+	std::unordered_map<uint32_t, string> mMidFromSsrc; // cache
 
 	std::atomic<State> mState;
 	std::atomic<GatheringState> mGatheringState;
+	std::atomic<SignalingState> mSignalingState;
+	std::atomic<bool> mNegotiationNeeded;
 
 	synchronized_callback<std::shared_ptr<DataChannel>> mDataChannelCallback;
 	synchronized_callback<Description> mLocalDescriptionCallback;
 	synchronized_callback<Candidate> mLocalCandidateCallback;
 	synchronized_callback<State> mStateChangeCallback;
 	synchronized_callback<GatheringState> mGatheringStateChangeCallback;
+	synchronized_callback<SignalingState> mSignalingStateChangeCallback;
 	synchronized_callback<std::shared_ptr<Track>> mTrackCallback;
 };
 
 } // namespace rtc
 
-std::ostream &operator<<(std::ostream &out, const rtc::PeerConnection::State &state);
-std::ostream &operator<<(std::ostream &out, const rtc::PeerConnection::GatheringState &state);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, rtc::PeerConnection::State state);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, rtc::PeerConnection::GatheringState state);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, rtc::PeerConnection::SignalingState state);
 
 #endif

include/rtc/queue.hpp

@@ -170,4 +170,3 @@ template <typename T> std::optional<T> Queue<T>::popImpl() {
 } // namespace rtc
 
 #endif
-

include/rtc/reliability.hpp

@@ -37,4 +37,3 @@ struct Reliability {
 } // namespace rtc
 
 #endif
-

include/rtc/rtc.h

@@ -25,8 +25,14 @@ extern "C" {
 
 #ifdef _WIN32
 #define RTC_EXPORT __declspec(dllexport)
+#ifdef CAPI_STDCALL
+#define RTC_API __stdcall
 #else
+#define RTC_API
+#endif
+#else // not WIN32
 #define RTC_EXPORT
+#define RTC_API
 #endif
 
 #ifndef RTC_ENABLE_WEBSOCKET
@@ -53,6 +59,14 @@ typedef enum {
 	RTC_GATHERING_COMPLETE = 2
 } rtcGatheringState;
 
+typedef enum {
+	RTC_SIGNALING_STABLE = 0,
+	RTC_SIGNALING_HAVE_LOCAL_OFFER = 1,
+	RTC_SIGNALING_HAVE_REMOTE_OFFER = 2,
+	RTC_SIGNALING_HAVE_LOCAL_PRANSWER = 3,
+	RTC_SIGNALING_HAVE_REMOTE_PRANSWER = 4,
+} rtcSignalingState;
+
 typedef enum { // Don't change, it must match plog severity
 	RTC_LOG_NONE = 0,
 	RTC_LOG_FATAL = 1,
@@ -64,8 +78,10 @@ typedef enum { // Don't change, it must match plog severity
 } rtcLogLevel;
 
 #define RTC_ERR_SUCCESS 0
-#define RTC_ERR_INVALID -1 // invalid argument
-#define RTC_ERR_FAILURE -2 // runtime error
+#define RTC_ERR_INVALID -1   // invalid argument
+#define RTC_ERR_FAILURE -2   // runtime error
+#define RTC_ERR_NOT_AVAIL -3 // element not available
+#define RTC_ERR_TOO_SMALL -4 // buffer too small
 
 typedef struct {
 	const char **iceServers;
@@ -81,22 +97,34 @@ typedef struct {
 	unsigned int maxRetransmits;    // ignored if reliable
 } rtcReliability;
 
-typedef void (*rtcLogCallbackFunc)(rtcLogLevel level, const char *message);
-typedef void (*rtcDescriptionCallbackFunc)(const char *sdp, const char *type, void *ptr);
-typedef void (*rtcCandidateCallbackFunc)(const char *cand, const char *mid, void *ptr);
-typedef void (*rtcStateChangeCallbackFunc)(rtcState state, void *ptr);
-typedef void (*rtcGatheringStateCallbackFunc)(rtcGatheringState state, void *ptr);
-typedef void (*rtcDataChannelCallbackFunc)(int dc, void *ptr);
-typedef void (*rtcTrackCallbackFunc)(int tr, void *ptr);
-typedef void (*rtcOpenCallbackFunc)(void *ptr);
-typedef void (*rtcClosedCallbackFunc)(void *ptr);
-typedef void (*rtcErrorCallbackFunc)(const char *error, void *ptr);
-typedef void (*rtcMessageCallbackFunc)(const char *message, int size, void *ptr);
-typedef void (*rtcBufferedAmountLowCallbackFunc)(void *ptr);
-typedef void (*rtcAvailableCallbackFunc)(void *ptr);
+typedef struct {
+	rtcReliability reliability;
+	const char *protocol; // empty string if NULL
+	bool negotiated;
+	bool manualStream;
+	uint16_t stream; // numeric ID 0-65534, ignored if manualStream is false
+} rtcDataChannelInit;
+
+typedef void(RTC_API *rtcLogCallbackFunc)(rtcLogLevel level, const char *message);
+typedef void(RTC_API *rtcDescriptionCallbackFunc)(int pc, const char *sdp, const char *type,
+                                                  void *ptr);
+typedef void(RTC_API *rtcCandidateCallbackFunc)(int pc, const char *cand, const char *mid,
+                                                void *ptr);
+typedef void(RTC_API *rtcStateChangeCallbackFunc)(int pc, rtcState state, void *ptr);
+typedef void(RTC_API *rtcGatheringStateCallbackFunc)(int pc, rtcGatheringState state, void *ptr);
+typedef void(RTC_API *rtcSignalingStateCallbackFunc)(int pc, rtcSignalingState state, void *ptr);
+typedef void(RTC_API *rtcDataChannelCallbackFunc)(int pc, int dc, void *ptr);
+typedef void(RTC_API *rtcTrackCallbackFunc)(int pc, int tr, void *ptr);
+typedef void(RTC_API *rtcOpenCallbackFunc)(int id, void *ptr);
+typedef void(RTC_API *rtcClosedCallbackFunc)(int id, void *ptr);
+typedef void(RTC_API *rtcErrorCallbackFunc)(int id, const char *error, void *ptr);
+typedef void(RTC_API *rtcMessageCallbackFunc)(int id, const char *message, int size, void *ptr);
+typedef void(RTC_API *rtcBufferedAmountLowCallbackFunc)(int id, void *ptr);
+typedef void(RTC_API *rtcAvailableCallbackFunc)(int id, void *ptr);
 
 // Log
-RTC_EXPORT void rtcInitLogger(rtcLogLevel level, rtcLogCallbackFunc cb); // NULL cb to log to stdout
+// NULL cb on the first call will log to stdout
+RTC_EXPORT void rtcInitLogger(rtcLogLevel level, rtcLogCallbackFunc cb);
 
 // User pointer
 RTC_EXPORT void rtcSetUserPointer(int id, void *ptr);
@@ -109,25 +137,33 @@ RTC_EXPORT int rtcSetLocalDescriptionCallback(int pc, rtcDescriptionCallbackFunc
 RTC_EXPORT int rtcSetLocalCandidateCallback(int pc, rtcCandidateCallbackFunc cb);
 RTC_EXPORT int rtcSetStateChangeCallback(int pc, rtcStateChangeCallbackFunc cb);
 RTC_EXPORT int rtcSetGatheringStateChangeCallback(int pc, rtcGatheringStateCallbackFunc cb);
+RTC_EXPORT int rtcSetSignalingStateChangeCallback(int pc, rtcSignalingStateCallbackFunc cb);
 
-RTC_EXPORT int rtcSetLocalDescription(int pc);
+RTC_EXPORT int rtcSetLocalDescription(int pc, const char *type);
 RTC_EXPORT int rtcSetRemoteDescription(int pc, const char *sdp, const char *type);
 RTC_EXPORT int rtcAddRemoteCandidate(int pc, const char *cand, const char *mid);
 
+RTC_EXPORT int rtcGetLocalDescription(int pc, char *buffer, int size);
+RTC_EXPORT int rtcGetRemoteDescription(int pc, char *buffer, int size);
+
 RTC_EXPORT int rtcGetLocalAddress(int pc, char *buffer, int size);
 RTC_EXPORT int rtcGetRemoteAddress(int pc, char *buffer, int size);
 
+RTC_EXPORT int rtcGetSelectedCandidatePair(int pc, char *local, int localSize, char *remote,
+                                           int remoteSize);
+
 // DataChannel
 RTC_EXPORT int rtcSetDataChannelCallback(int pc, rtcDataChannelCallbackFunc cb);
 RTC_EXPORT int rtcAddDataChannel(int pc, const char *label); // returns dc id
-RTC_EXPORT int rtcAddDataChannelExt(int pc, const char *label, const char *protocol,
-                                    const rtcReliability *reliability); // returns dc id
+RTC_EXPORT int rtcAddDataChannelEx(int pc, const char *label,
+                                   const rtcDataChannelInit *init); // returns dc id
 // Equivalent to calling rtcAddDataChannel() and rtcSetLocalDescription()
 RTC_EXPORT int rtcCreateDataChannel(int pc, const char *label); // returns dc id
-RTC_EXPORT int rtcCreateDataChannelExt(int pc, const char *label, const char *protocol,
-                                       const rtcReliability *reliability); // returns dc id
+RTC_EXPORT int rtcCreateDataChannelEx(int pc, const char *label,
+                                      const rtcDataChannelInit *init); // returns dc id
 RTC_EXPORT int rtcDeleteDataChannel(int dc);
 
+RTC_EXPORT int rtcGetDataChannelStream(int dc);
 RTC_EXPORT int rtcGetDataChannelLabel(int dc, char *buffer, int size);
 RTC_EXPORT int rtcGetDataChannelProtocol(int dc, char *buffer, int size);
 RTC_EXPORT int rtcGetDataChannelReliability(int dc, rtcReliability *reliability);

include/rtc/rtc.hpp

@@ -27,4 +27,3 @@
 
 // C API
 #include "rtc.h"
-

include/rtc/rtcp.hpp

@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2020 Staz M
+ * Copyright (c) 2020 Staz Modrzynski
  * Copyright (c) 2020 Paul-Louis Ageneau
  *
  * This library is free software; you can redistribute it and/or
@@ -20,35 +20,67 @@
 #ifndef RTC_RTCP_H
 #define RTC_RTCP_H
 
+#include <utility>
+
 #include "include.hpp"
 #include "log.hpp"
 #include "message.hpp"
+#include "rtp.hpp"
 
 namespace rtc {
 
-typedef uint32_t SSRC;
+class RTC_CPP_EXPORT RtcpHandler {
+protected:
+	/**
+	 * Use this callback when trying to send custom data (such as RTCP) to the client.
+	 */
+	synchronized_callback<rtc::message_ptr> outgoingCallback;
 
-class RtcpHandler {
 public:
-	virtual void onOutgoing(std::function<void(rtc::message_ptr)> cb) = 0;
-	virtual std::optional<rtc::message_ptr> incoming(rtc::message_ptr ptr) = 0;
+	/**
+	 * Called when there is traffic coming from the peer
+	 * @param ptr
+	 * @return
+	 */
+	virtual rtc::message_ptr incoming(rtc::message_ptr ptr) = 0;
+
+	/**
+	 * Called when there is traffic that needs to be sent to the peer
+	 * @param ptr
+	 * @return
+	 */
+	virtual rtc::message_ptr outgoing(rtc::message_ptr ptr) = 0;
+
+	/**
+	 * This callback is used to send traffic back to the peer.
+	 * This callback skips calling the track's methods.
+	 * @param cb
+	 */
+	void onOutgoing(const std::function<void(rtc::message_ptr)> &cb);
+
+	virtual bool requestKeyframe() { return false; }
 };
 
-// An RtcpSession can be plugged into a Track to handle the whole RTCP session
-class RtcpSession : public RtcpHandler {
-public:
-	void onOutgoing(std::function<void(rtc::message_ptr)> cb) override;
+class Track;
+
+// An RtcpSession can be plugged into a Track to handle the whole RTCP session
+class RTC_CPP_EXPORT RtcpReceivingSession : public RtcpHandler {
+public:
+	rtc::message_ptr incoming(rtc::message_ptr ptr) override;
+	rtc::message_ptr outgoing(rtc::message_ptr ptr) override;
+	bool send(rtc::message_ptr ptr);
 
-	std::optional<rtc::message_ptr> incoming(rtc::message_ptr ptr) override;
 	void requestBitrate(unsigned int newBitrate);
 
-private:
+	bool requestKeyframe() override;
+
+protected:
 	void pushREMB(unsigned int bitrate);
 	void pushRR(unsigned int lastSR_delay);
-	void tx(message_ptr msg);
+
+	void pushPLI();
 
 	unsigned int mRequestedBitrate = 0;
-	synchronized_callback<rtc::message_ptr> mTxCallback;
 	SSRC mSsrc = 0;
 	uint32_t mGreatestSeqNo = 0;
 	uint64_t mSyncRTPTS, mSyncNTPTS;

include/rtc/rtp.hpp

@@ -0,0 +1,517 @@
+/**
+ * Copyright (c) 2020 Staz Modrzynski
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_RTP_HPP
+#define RTC_RTP_HPP
+
+#include "log.hpp"
+
+#include <cmath>
+
+#ifdef _WIN32
+#include <winsock2.h>
+#else
+#include <arpa/inet.h>
+#endif
+
+#ifndef htonll
+#define htonll(x)                                                                                  \
+	((uint64_t)htonl(((uint64_t)(x)&0xFFFFFFFF) << 32) | (uint64_t)htonl((uint64_t)(x) >> 32))
+#endif
+#ifndef ntohll
+#define ntohll(x) htonll(x)
+#endif
+
+namespace rtc {
+
+typedef uint32_t SSRC;
+
+#pragma pack(push, 1)
+
+struct RTP {
+private:
+	uint8_t _first;
+	uint8_t _payloadType;
+	uint16_t _seqNumber;
+	uint32_t _timestamp;
+	SSRC _ssrc;
+
+public:
+	SSRC csrc[16];
+
+	inline uint8_t version() const { return _first >> 6; }
+	inline bool padding() const { return (_first >> 5) & 0x01; }
+	inline bool extension() const { return (_first >> 4) & 0x01; }
+	inline uint8_t csrcCount() const { return _first & 0x0F; }
+	inline uint8_t marker() const { return _payloadType & 0b10000000; }
+	inline uint8_t payloadType() const { return _payloadType & 0b01111111; }
+	inline uint16_t seqNumber() const { return ntohs(_seqNumber); }
+	inline uint32_t timestamp() const { return ntohl(_timestamp); }
+	inline uint32_t ssrc() const { return ntohl(_ssrc); }
+
+	inline size_t getSize() const {
+		return reinterpret_cast<const char *>(&csrc) - reinterpret_cast<const char *>(this) +
+		       sizeof(SSRC) * csrcCount();
+	}
+
+	[[nodiscard]] char *getBody() {
+		return reinterpret_cast<char *>(&csrc) + sizeof(SSRC) * csrcCount();
+	}
+
+	[[nodiscard]] const char *getBody() const {
+		return reinterpret_cast<const char *>(&csrc) + sizeof(SSRC) * csrcCount();
+	}
+
+	inline void setSeqNumber(uint16_t newSeqNo) { _seqNumber = htons(newSeqNo); }
+	inline void setPayloadType(uint8_t newPayloadType) {
+		_payloadType = (_payloadType & 0b10000000u) | (0b01111111u & newPayloadType);
+	}
+	inline void setSsrc(uint32_t in_ssrc) { _ssrc = htonl(in_ssrc); }
+
+	void setTimestamp(uint32_t i) { _timestamp = htonl(i); }
+
+	void log() {
+		PLOG_VERBOSE << "RTP V: " << (int)version() << " P: " << (padding() ? "P" : " ")
+		             << " X: " << (extension() ? "X" : " ") << " CC: " << (int)csrcCount()
+		             << " M: " << (marker() ? "M" : " ") << " PT: " << (int)payloadType()
+		             << " SEQNO: " << seqNumber() << " TS: " << timestamp();
+	}
+};
+
+struct RTCP_ReportBlock {
+	SSRC ssrc;
+
+private:
+	uint32_t _fractionLostAndPacketsLost; // fraction lost is 8-bit, packets lost is 24-bit
+	uint16_t _seqNoCycles;
+	uint16_t _highestSeqNo;
+	uint32_t _jitter;
+	uint32_t _lastReport;
+	uint32_t _delaySinceLastReport;
+
+public:
+	inline void preparePacket(SSRC in_ssrc, [[maybe_unused]] unsigned int packetsLost,
+	                          [[maybe_unused]] unsigned int totalPackets, uint16_t highestSeqNo,
+	                          uint16_t seqNoCycles, uint32_t jitter, uint64_t lastSR_NTP,
+	                          uint64_t lastSR_DELAY) {
+		setSeqNo(highestSeqNo, seqNoCycles);
+		setJitter(jitter);
+		setSSRC(in_ssrc);
+
+		// Middle 32 bits of NTP Timestamp
+		//		  this->lastReport = lastSR_NTP >> 16u;
+		setNTPOfSR(uint64_t(lastSR_NTP));
+		setDelaySinceSR(uint32_t(lastSR_DELAY));
+
+		// The delay, expressed in units of 1/65536 seconds
+		// this->delaySinceLastReport = lastSR_DELAY;
+	}
+
+	inline void setSSRC(SSRC in_ssrc) { this->ssrc = htonl(in_ssrc); }
+	[[nodiscard]] inline SSRC getSSRC() const { return ntohl(ssrc); }
+
+	inline void setPacketsLost([[maybe_unused]] unsigned int packetsLost,
+	                           [[maybe_unused]] unsigned int totalPackets) {
+		// TODO Implement loss percentages.
+		_fractionLostAndPacketsLost = 0;
+	}
+
+	[[nodiscard]] inline unsigned int getLossPercentage() const {
+		// TODO Implement loss percentages.
+		return 0;
+	}
+	[[nodiscard]] inline unsigned int getPacketLostCount() const {
+		// TODO Implement total packets lost.
+		return 0;
+	}
+
+	inline uint16_t seqNoCycles() const { return ntohs(_seqNoCycles); }
+	inline uint16_t highestSeqNo() const { return ntohs(_highestSeqNo); }
+	inline uint32_t jitter() const { return ntohl(_jitter); }
+
+	inline void setSeqNo(uint16_t highestSeqNo, uint16_t seqNoCycles) {
+		_highestSeqNo = htons(highestSeqNo);
+		_seqNoCycles = htons(seqNoCycles);
+	}
+
+	inline void setJitter(uint32_t jitter) { _jitter = htonl(jitter); }
+
+	inline void setNTPOfSR(uint64_t ntp) { _lastReport = htonll(ntp >> 16u); }
+	[[nodiscard]] inline uint32_t getNTPOfSR() const { return ntohl(_lastReport) << 16u; }
+
+	inline void setDelaySinceSR(uint32_t sr) {
+		// The delay, expressed in units of 1/65536 seconds
+		_delaySinceLastReport = htonl(sr);
+	}
+	[[nodiscard]] inline uint32_t getDelaySinceSR() const { return ntohl(_delaySinceLastReport); }
+
+	inline void log() const {
+		PLOG_VERBOSE << "RTCP report block: "
+		             << "ssrc="
+		             << ntohl(ssrc)
+		             // TODO: Implement these reports
+		             //	<< ", fractionLost=" << fractionLost
+		             //	<< ", packetsLost=" << packetsLost
+		             << ", highestSeqNo=" << highestSeqNo() << ", seqNoCycles=" << seqNoCycles()
+		             << ", jitter=" << jitter() << ", lastSR=" << getNTPOfSR()
+		             << ", lastSRDelay=" << getDelaySinceSR();
+	}
+};
+
+struct RTCP_HEADER {
+private:
+	uint8_t _first;
+	uint8_t _payloadType;
+	uint16_t _length;
+
+public:
+	inline uint8_t version() const { return _first >> 6; }
+	inline bool padding() const { return (_first >> 5) & 0x01; }
+	inline uint8_t reportCount() const { return _first & 0x0F; }
+	inline uint8_t payloadType() const { return _payloadType; }
+	inline uint16_t length() const { return ntohs(_length); }
+	inline size_t lengthInBytes() const { return (1 + length()) * 4; }
+
+	inline void setPayloadType(uint8_t type) { _payloadType = type; }
+	inline void setReportCount(uint8_t count) {
+		_first = (_first & 0b11100000u) | (count & 0b00011111u);
+	}
+	inline void setLength(uint16_t length) { _length = htons(length); }
+
+	inline void prepareHeader(uint8_t payloadType, uint8_t reportCount, uint16_t length) {
+		_first = 0b10000000; // version 2, no padding
+		setReportCount(reportCount);
+		setPayloadType(payloadType);
+		setLength(length);
+	}
+
+	inline void log() const {
+		PLOG_VERBOSE << "RTCP header: "
+		             << "version=" << unsigned(version()) << ", padding=" << padding()
+		             << ", reportCount=" << unsigned(reportCount())
+		             << ", payloadType=" << unsigned(payloadType()) << ", length=" << length();
+	}
+};
+
+struct RTCP_FB_HEADER {
+	RTCP_HEADER header;
+	SSRC packetSender;
+	SSRC mediaSource;
+
+	[[nodiscard]] SSRC getPacketSenderSSRC() const { return ntohl(packetSender); }
+
+	[[nodiscard]] SSRC getMediaSourceSSRC() const { return ntohl(mediaSource); }
+
+	void setPacketSenderSSRC(SSRC ssrc) { this->packetSender = htonl(ssrc); }
+
+	void setMediaSourceSSRC(SSRC ssrc) { this->mediaSource = htonl(ssrc); }
+
+	void log() {
+		header.log();
+		PLOG_VERBOSE << "FB: "
+		             << " packet sender: " << getPacketSenderSSRC()
+		             << " media source: " << getMediaSourceSSRC();
+	}
+};
+
+struct RTCP_SR {
+	RTCP_HEADER header;
+	SSRC _senderSSRC;
+
+private:
+	uint64_t _ntpTimestamp;
+	uint32_t _rtpTimestamp;
+	uint32_t _packetCount;
+	uint32_t _octetCount;
+
+	RTCP_ReportBlock _reportBlocks;
+
+public:
+	inline void preparePacket(SSRC senderSSRC, uint8_t reportCount) {
+		unsigned int length =
+		    ((sizeof(header) + 24 + reportCount * sizeof(RTCP_ReportBlock)) / 4) - 1;
+		header.prepareHeader(200, reportCount, uint16_t(length));
+		this->_senderSSRC = htonl(senderSSRC);
+	}
+
+	[[nodiscard]] inline RTCP_ReportBlock *getReportBlock(int num) { return &_reportBlocks + num; }
+	[[nodiscard]] inline const RTCP_ReportBlock *getReportBlock(int num) const {
+		return &_reportBlocks + num;
+	}
+
+	[[nodiscard]] inline size_t getSize() const {
+		// "length" in packet is one less than the number of 32 bit words in the packet.
+		return sizeof(uint32_t) * (1 + size_t(header.length()));
+	}
+
+	inline uint64_t ntpTimestamp() const { return ntohll(_ntpTimestamp); }
+	inline uint32_t rtpTimestamp() const { return ntohl(_rtpTimestamp); }
+	inline uint32_t packetCount() const { return ntohl(_packetCount); }
+	inline uint32_t octetCount() const { return ntohl(_octetCount); }
+	inline uint32_t senderSSRC() const { return ntohl(_senderSSRC); }
+
+	inline void setNtpTimestamp(uint32_t ts) { _ntpTimestamp = htonll(ts); }
+	inline void setRtpTimestamp(uint32_t ts) { _rtpTimestamp = htonl(ts); }
+
+	inline void log() const {
+		header.log();
+		PLOG_VERBOSE << "RTCP SR: "
+		             << " SSRC=" << senderSSRC() << ", NTP_TS=" << ntpTimestamp()
+		             << ", RTP_TS=" << rtpTimestamp() << ", packetCount=" << packetCount()
+		             << ", octetCount=" << octetCount();
+
+		for (unsigned i = 0; i < unsigned(header.reportCount()); i++) {
+			getReportBlock(i)->log();
+		}
+	}
+};
+
+struct RTCP_RR {
+	RTCP_HEADER header;
+	SSRC _senderSSRC;
+
+private:
+	RTCP_ReportBlock _reportBlocks;
+
+public:
+	[[nodiscard]] inline RTCP_ReportBlock *getReportBlock(int num) { return &_reportBlocks + num; }
+	[[nodiscard]] inline const RTCP_ReportBlock *getReportBlock(int num) const {
+		return &_reportBlocks + num;
+	}
+
+	inline SSRC senderSSRC() const { return ntohl(_senderSSRC); }
+	inline void setSenderSSRC(SSRC ssrc) { this->_senderSSRC = htonl(ssrc); }
+
+	[[nodiscard]] inline size_t getSize() const {
+		// "length" in packet is one less than the number of 32 bit words in the packet.
+		return sizeof(uint32_t) * (1 + size_t(header.length()));
+	}
+
+	inline void preparePacket(SSRC senderSSRC, uint8_t reportCount) {
+		// "length" in packet is one less than the number of 32 bit words in the packet.
+		size_t length = (sizeWithReportBlocks(reportCount) / 4) - 1;
+		header.prepareHeader(201, reportCount, uint16_t(length));
+		this->_senderSSRC = htonl(senderSSRC);
+	}
+
+	inline static size_t sizeWithReportBlocks(uint8_t reportCount) {
+		return sizeof(header) + 4 + size_t(reportCount) * sizeof(RTCP_ReportBlock);
+	}
+
+	inline bool isSenderReport() { return header.payloadType() == 200; }
+
+	inline bool isReceiverReport() { return header.payloadType() == 201; }
+
+	inline void log() const {
+		header.log();
+		PLOG_VERBOSE << "RTCP RR: "
+		             << " SSRC=" << ntohl(_senderSSRC);
+
+		for (unsigned i = 0; i < unsigned(header.reportCount()); i++) {
+			getReportBlock(i)->log();
+		}
+	}
+};
+
+struct RTCP_REMB {
+	RTCP_FB_HEADER header;
+
+	/*! \brief Unique identifier ('R' 'E' 'M' 'B') */
+	char id[4];
+
+	/*! \brief Num SSRC, Br Exp, Br Mantissa (bit mask) */
+	uint32_t bitrate;
+
+	SSRC ssrc[1];
+
+	[[nodiscard]] unsigned int getSize() const {
+		// "length" in packet is one less than the number of 32 bit words in the packet.
+		return sizeof(uint32_t) * (1 + header.header.length());
+	}
+
+	void preparePacket(SSRC senderSSRC, unsigned int numSSRC, unsigned int in_bitrate) {
+
+		// Report Count becomes the format here.
+		header.header.prepareHeader(206, 15, 0);
+
+		// Always zero.
+		header.setMediaSourceSSRC(0);
+
+		header.setPacketSenderSSRC(senderSSRC);
+
+		id[0] = 'R';
+		id[1] = 'E';
+		id[2] = 'M';
+		id[3] = 'B';
+
+		setBitrate(numSSRC, in_bitrate);
+	}
+
+	void setBitrate(unsigned int numSSRC, unsigned int in_bitrate) {
+		unsigned int exp = 0;
+		while (in_bitrate > pow(2, 18) - 1) {
+			exp++;
+			in_bitrate /= 2;
+		}
+
+		// "length" in packet is one less than the number of 32 bit words in the packet.
+		header.header.setLength(
+		    uint16_t((offsetof(RTCP_REMB, ssrc) / sizeof(uint32_t)) - 1 + numSSRC));
+
+		this->bitrate = htonl((numSSRC << (32u - 8u)) | (exp << (32u - 8u - 6u)) | in_bitrate);
+	}
+
+	void setSsrc(int iterator, SSRC newSssrc) { ssrc[iterator] = htonl(newSssrc); }
+
+	size_t static inline sizeWithSSRCs(int count) {
+		return sizeof(RTCP_REMB) + (count - 1) * sizeof(SSRC);
+	}
+};
+
+struct RTCP_PLI {
+	RTCP_FB_HEADER header;
+
+	void preparePacket(SSRC messageSSRC) {
+		header.header.prepareHeader(206, 1, 2);
+		header.setPacketSenderSSRC(messageSSRC);
+		header.setMediaSourceSSRC(messageSSRC);
+	}
+
+	void print() { header.log(); }
+
+	[[nodiscard]] static unsigned int size() { return sizeof(RTCP_FB_HEADER); }
+};
+
+struct RTCP_FIR_PART {
+	uint32_t ssrc;
+	uint8_t seqNo;
+	uint8_t dummy1;
+	uint16_t dummy2;
+};
+
+struct RTCP_FIR {
+	RTCP_FB_HEADER header;
+	RTCP_FIR_PART parts[1];
+
+	void preparePacket(SSRC messageSSRC, uint8_t seqNo) {
+		header.header.prepareHeader(206, 4, 2 + 2 * 1);
+		header.setPacketSenderSSRC(messageSSRC);
+		header.setMediaSourceSSRC(messageSSRC);
+		parts[0].ssrc = htonl(messageSSRC);
+		parts[0].seqNo = seqNo;
+	}
+
+	void print() { header.log(); }
+
+	[[nodiscard]] static unsigned int size() {
+		return sizeof(RTCP_FB_HEADER) + sizeof(RTCP_FIR_PART);
+	}
+};
+
+struct RTCP_NACK_PART {
+	uint16_t pid;
+	uint16_t blp;
+};
+
+class RTCP_NACK {
+public:
+	RTCP_FB_HEADER header;
+	RTCP_NACK_PART parts[1];
+
+public:
+	void preparePacket(SSRC ssrc, unsigned int discreteSeqNoCount) {
+		header.header.prepareHeader(205, 1, 2 + uint16_t(discreteSeqNoCount));
+		header.setMediaSourceSSRC(ssrc);
+		header.setPacketSenderSSRC(ssrc);
+	}
+
+	/**
+	 * Add a packet to the list of missing packets.
+	 * @param fciCount The number of FCI fields that are present in this packet.
+	 *                  Let the number start at zero and let this function grow the number.
+	 * @param fciPID The seq no of the active FCI. It will be initialized automatically, and will
+	 * change automatically.
+	 * @param missingPacket The seq no of the missing packet. This will be added to the queue.
+	 * @return true if the packet has grown, false otherwise.
+	 */
+	bool addMissingPacket(unsigned int *fciCount, uint16_t *fciPID, const uint16_t &missingPacket) {
+		if (*fciCount == 0 || missingPacket < *fciPID || missingPacket > (*fciPID + 16)) {
+			parts[*fciCount].pid = htons(missingPacket);
+			parts[*fciCount].blp = 0;
+			*fciPID = missingPacket;
+			(*fciCount)++;
+			return true;
+		} else {
+			// TODO SPEEED!
+			parts[(*fciCount) - 1].blp = htons(ntohs(parts[(*fciCount) - 1].blp) |
+			                                   (1u << (unsigned int)(missingPacket - *fciPID)));
+			return false;
+		}
+	}
+
+	[[nodiscard]] static unsigned int getSize(unsigned int discreteSeqNoCount) {
+		return offsetof(RTCP_NACK, parts) + sizeof(RTCP_NACK_PART) * discreteSeqNoCount;
+	}
+
+	[[nodiscard]] unsigned int getSeqNoCount() { return header.header.length() - 2; }
+};
+
+class RTP_RTX {
+private:
+	RTP header;
+
+public:
+	size_t copyTo(RTP *dest, size_t totalSize, uint8_t originalPayloadType) {
+		memmove((char *)dest, (char *)this, header.getSize());
+		dest->setSeqNumber(getOriginalSeqNo());
+		dest->setPayloadType(originalPayloadType);
+		memmove(dest->getBody(), getBody(), getBodySize(totalSize));
+		return totalSize;
+	}
+
+	[[nodiscard]] uint16_t getOriginalSeqNo() const {
+		return ntohs(*(uint16_t *)(header.getBody()));
+	}
+
+	[[nodiscard]] char *getBody() { return header.getBody() + sizeof(uint16_t); }
+
+	[[nodiscard]] const char *getBody() const { return header.getBody() + sizeof(uint16_t); }
+
+	[[nodiscard]] size_t getBodySize(size_t totalSize) {
+		return totalSize - (getBody() - reinterpret_cast<char *>(this));
+	}
+
+	[[nodiscard]] RTP &getHeader() { return header; }
+
+	size_t normalizePacket(size_t totalSize, SSRC originalSSRC, uint8_t originalPayloadType) {
+		header.setSeqNumber(getOriginalSeqNo());
+		header.setSsrc(originalSSRC);
+		header.setPayloadType(originalPayloadType);
+		// TODO, the -12 is the size of the header (which is variable!)
+		memmove(header.getBody(), header.getBody() + sizeof(uint16_t),
+		        totalSize - 12 - sizeof(uint16_t));
+		return totalSize - sizeof(uint16_t);
+	}
+};
+
+#pragma pack(pop)
+
+}; // namespace rtc
+
+#endif

include/rtc/track.hpp

@@ -35,7 +35,7 @@ namespace rtc {
 class DtlsSrtpTransport;
 #endif
 
-class Track final : public std::enable_shared_from_this<Track>, public Channel {
+class RTC_CPP_EXPORT Track final : public std::enable_shared_from_this<Track>, public Channel {
 public:
 	Track(Description::Media description);
 	~Track() = default;
@@ -43,9 +43,11 @@ public:
 	string mid() const;
 	Description::Media description() const;
 
+	void setDescription(Description::Media description);
+
 	void close(void) override;
 	bool send(message_variant data) override;
-	bool send(const byte *data, size_t size);
+	bool send(const byte *data, size_t size) override;
 
 	bool isOpen(void) const override;
 	bool isClosed(void) const override;
@@ -54,9 +56,13 @@ public:
 	// Extended API
 	size_t availableAmount() const override;
 	std::optional<message_variant> receive() override;
+	std::optional<message_variant> peek() override;
+
+	bool requestKeyframe();
 
 	// RTCP handler
 	void setRtcpHandler(std::shared_ptr<RtcpHandler> handler);
+	std::shared_ptr<RtcpHandler> getRtcpHandler();
 
 private:
 #if RTC_ENABLE_MEDIA
@@ -64,8 +70,8 @@ private:
 	std::weak_ptr<DtlsSrtpTransport> mDtlsSrtpTransport;
 #endif
 
-	bool outgoing(message_ptr message);
 	void incoming(message_ptr message);
+	bool outgoing(message_ptr message);
 
 	Description::Media mMediaDescription;
 	std::atomic<bool> mIsClosed = false;
@@ -79,4 +85,3 @@ private:
 } // namespace rtc
 
 #endif
-

include/rtc/websocket.hpp

@@ -38,7 +38,7 @@ class TcpTransport;
 class TlsTransport;
 class WsTransport;
 
-class WebSocket final : public Channel, public std::enable_shared_from_this<WebSocket> {
+class RTC_CPP_EXPORT WebSocket final : public Channel, public std::enable_shared_from_this<WebSocket> {
 public:
 	enum class State : int {
 		Connecting = 0,
@@ -49,6 +49,7 @@ public:
 
 	struct Configuration {
 		bool disableTlsVerification = false; // if true, don't verify the TLS certificate
+		std::vector<string> protocols;
 	};
 
 	WebSocket(std::optional<Configuration> config = nullopt);
@@ -59,6 +60,7 @@ public:
 	void open(const string &url);
 	void close() override;
 	bool send(const message_variant data) override;
+	bool send(const byte *data, size_t size) override;
 
 	bool isOpen() const override;
 	bool isClosed() const override;
@@ -66,6 +68,7 @@ public:
 
 	// Extended API
 	std::optional<message_variant> receive() override;
+	std::optional<message_variant> peek() override;
 	size_t availableAmount() const override; // total size available to receive
 
 private:

src/base64.cpp

@@ -25,8 +25,7 @@ namespace rtc {
 using std::to_integer;
 
 string to_base64(const binary &data) {
-	static const char tab[] =
-	    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+	static const char tab[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 
 	string out;
 	out.reserve(3 * ((data.size() + 3) / 4));

src/candidate.cpp

@@ -20,15 +20,17 @@
 
 #include <algorithm>
 #include <array>
+#include <cctype>
 #include <sstream>
+#include <unordered_map>
 
 #ifdef _WIN32
 #include <winsock2.h>
 #include <ws2tcpip.h>
 #else
 #include <netdb.h>
-#include <sys/socket.h>
 #include <netinet/in.h>
+#include <sys/socket.h>
 #endif
 
 #include <sys/types.h>
@@ -38,95 +40,174 @@ using std::string;
 
 namespace {
 
-inline bool hasprefix(const string &str, const string &prefix) {
+inline bool match_prefix(const string &str, const string &prefix) {
 	return str.size() >= prefix.size() &&
 	       std::mismatch(prefix.begin(), prefix.end(), str.begin()).first == prefix.end();
 }
 
+inline void trim_begin(string &str) {
+	str.erase(str.begin(),
+	          std::find_if(str.begin(), str.end(), [](char c) { return !std::isspace(c); }));
+}
+
+inline void trim_end(string &str) {
+	str.erase(
+	    std::find_if(str.rbegin(), str.rend(), [](char c) { return !std::isspace(c); }).base(),
+	    str.end());
+}
+
 } // namespace
 
 namespace rtc {
 
-Candidate::Candidate(string candidate, string mid) : mIsResolved(false) {
+Candidate::Candidate()
+    : mFoundation("none"), mComponent(0), mPriority(0), mTypeString("unknown"),
+      mTransportString("unknown"), mType(Type::Unknown), mTransportType(TransportType::Unknown),
+      mNode("0.0.0.0"), mService("9"), mFamily(Family::Unresolved), mPort(0) {}
+
+Candidate::Candidate(string candidate) : Candidate() {
+	if (!candidate.empty())
+		parse(std::move(candidate));
+}
+
+Candidate::Candidate(string candidate, string mid) : Candidate() {
+	if (!candidate.empty())
+		parse(std::move(candidate));
+	if (!mid.empty())
+		mMid.emplace(std::move(mid));
+}
+
+void Candidate::parse(string candidate) {
+	using TypeMap_t = std::unordered_map<string, Type>;
+	using TcpTypeMap_t = std::unordered_map<string, TransportType>;
+
+	static const TypeMap_t TypeMap = {{"host", Type::Host},
+	                                  {"srflx", Type::ServerReflexive},
+	                                  {"prflx", Type::PeerReflexive},
+	                                  {"relay", Type::Relayed}};
+
+	static const TcpTypeMap_t TcpTypeMap = {{"active", TransportType::TcpActive},
+	                                        {"passive", TransportType::TcpPassive},
+	                                        {"so", TransportType::TcpSo}};
+
 	const std::array prefixes{"a=", "candidate:"};
 	for (const string &prefix : prefixes)
-		if (hasprefix(candidate, prefix))
+		if (match_prefix(candidate, prefix))
 			candidate.erase(0, prefix.size());
 
-	mCandidate = std::move(candidate);
-	mMid = std::move(mid);
+	PLOG_VERBOSE << "Parsing candidate: " << candidate;
+
+	// See RFC 8445 for format
+	std::istringstream iss(candidate);
+	string transport, typ_, type;
+	if (!(iss >> mFoundation >> mComponent >> mTransportString >> mPriority &&
+	      iss >> mNode >> mService >> typ_ >> mTypeString && typ_ == "typ"))
+		throw std::invalid_argument("Invalid candidate format");
+
+	std::getline(iss, mTail);
+	trim_begin(mTail);
+	trim_end(mTail);
+
+	if (auto it = TypeMap.find(type); it != TypeMap.end())
+		mType = it->second;
+	else
+		mType = Type::Unknown;
+
+	if (transport == "UDP" || transport == "udp") {
+		mTransportType = TransportType::Udp;
+	} else if (transport == "TCP" || transport == "tcp") {
+		// Peek tail to find TCP type
+		std::istringstream iss(mTail);
+		string tcptype_, tcptype;
+		if (iss >> tcptype_ >> tcptype && tcptype_ == "tcptype") {
+			if (auto it = TcpTypeMap.find(tcptype); it != TcpTypeMap.end())
+				mTransportType = it->second;
+			else
+				mTransportType = TransportType::TcpUnknown;
+
+		} else {
+			mTransportType = TransportType::TcpUnknown;
+		}
+	} else {
+		mTransportType = TransportType::Unknown;
+	}
+}
+
+void Candidate::hintMid(string mid) {
+	if (!mMid)
+		mMid.emplace(std::move(mid));
 }
 
 bool Candidate::resolve(ResolveMode mode) {
-	if (mIsResolved)
-		return true;
-
 	PLOG_VERBOSE << "Resolving candidate (mode="
-				 << (mode == ResolveMode::Simple ? "simple" : "lookup")
-				 << "): " << mCandidate;
+	             << (mode == ResolveMode::Simple ? "simple" : "lookup") << "): " << mNode << ' '
+	             << mService;
 
-	// See RFC 8445 for format
-	std::istringstream iss(mCandidate);
-	int component{0}, priority{0};
-	string foundation, transport, node, service, typ_, type;
-	if (iss >> foundation >> component >> transport >> priority &&
-	    iss >> node >> service >> typ_ >> type && typ_ == "typ") {
-
-		string left;
-		std::getline(iss, left);
-
-		// Try to resolve the node
-		struct addrinfo hints = {};
-		hints.ai_family = AF_UNSPEC;
-		hints.ai_flags = AI_ADDRCONFIG;
-		if (transport == "UDP" || transport == "udp") {
-			hints.ai_socktype = SOCK_DGRAM;
-			hints.ai_protocol = IPPROTO_UDP;
-		}
-
-		if (transport == "TCP" || transport == "tcp") {
-			hints.ai_socktype = SOCK_STREAM;
-			hints.ai_protocol = IPPROTO_TCP;
-		}
-
-		if (mode == ResolveMode::Simple)
-			hints.ai_flags |= AI_NUMERICHOST;
-
-		struct addrinfo *result = nullptr;
-		if (getaddrinfo(node.c_str(), service.c_str(), &hints, &result) == 0) {
-			for (auto p = result; p; p = p->ai_next) {
-				if (p->ai_family == AF_INET || p->ai_family == AF_INET6) {
-					// Rewrite the candidate
-					char nodebuffer[MAX_NUMERICNODE_LEN];
-					char servbuffer[MAX_NUMERICSERV_LEN];
-					if (getnameinfo(p->ai_addr, socklen_t(p->ai_addrlen), nodebuffer,
-					                MAX_NUMERICNODE_LEN, servbuffer, MAX_NUMERICSERV_LEN,
-					                NI_NUMERICHOST | NI_NUMERICSERV) == 0) {
-						const char sp{' '};
-						std::ostringstream oss;
-						oss << foundation << sp << component << sp << transport << sp << priority;
-						oss << sp << nodebuffer << sp << servbuffer << sp << "typ" << sp << type;
-						oss << left;
-						mCandidate = oss.str();
-						mIsResolved = true;
-						PLOG_VERBOSE << "Resolved candidate: " << mCandidate;
-						break;
-					}
-				}
-			}
-
-			freeaddrinfo(result);
-		}
+	// Try to resolve the node and service
+	struct addrinfo hints = {};
+	hints.ai_family = AF_UNSPEC;
+	hints.ai_flags = AI_ADDRCONFIG;
+	if (mTransportType == TransportType::Udp) {
+		hints.ai_socktype = SOCK_DGRAM;
+		hints.ai_protocol = IPPROTO_UDP;
+	} else if (mTransportType != TransportType::Unknown) {
+		hints.ai_socktype = SOCK_STREAM;
+		hints.ai_protocol = IPPROTO_TCP;
 	}
 
-	return mIsResolved;
+	if (mode == ResolveMode::Simple)
+		hints.ai_flags |= AI_NUMERICHOST;
+
+	struct addrinfo *result = nullptr;
+	if (getaddrinfo(mNode.c_str(), mService.c_str(), &hints, &result) == 0) {
+		for (auto p = result; p; p = p->ai_next) {
+			if (p->ai_family == AF_INET || p->ai_family == AF_INET6) {
+				char nodebuffer[MAX_NUMERICNODE_LEN];
+				char servbuffer[MAX_NUMERICSERV_LEN];
+				if (getnameinfo(p->ai_addr, socklen_t(p->ai_addrlen), nodebuffer,
+				                MAX_NUMERICNODE_LEN, servbuffer, MAX_NUMERICSERV_LEN,
+				                NI_NUMERICHOST | NI_NUMERICSERV) == 0) {
+
+					mAddress = nodebuffer;
+					mPort = uint16_t(std::stoul(servbuffer));
+					mFamily = p->ai_family == AF_INET6 ? Family::Ipv6 : Family::Ipv4;
+					PLOG_VERBOSE << "Resolved candidate: " << mAddress << ' ' << mPort;
+					break;
+				}
+			}
+		}
+
+		freeaddrinfo(result);
+	}
+
+	return mFamily != Family::Unresolved;
 }
 
-bool Candidate::isResolved() const { return mIsResolved; }
+Candidate::Type Candidate::type() const { return mType; }
 
-string Candidate::candidate() const { return "candidate:" + mCandidate; }
+Candidate::TransportType Candidate::transportType() const { return mTransportType; }
 
-string Candidate::mid() const { return mMid; }
+uint32_t Candidate::priority() const { return mPriority; }
+
+string Candidate::candidate() const {
+	const char sp{' '};
+	std::ostringstream oss;
+	oss << "candidate:";
+	oss << mFoundation << sp << mComponent << sp << mTransportString << sp << mPriority << sp;
+	if (isResolved())
+		oss << mAddress << sp << mPort;
+	else
+		oss << mNode << sp << mService;
+
+	oss << sp << "typ" << sp << mTypeString;
+
+	if (!mTail.empty())
+		oss << sp << mTail;
+
+	return oss.str();
+}
+
+string Candidate::mid() const { return mMid.value_or("0"); }
 
 Candidate::operator string() const {
 	std::ostringstream line;
@@ -134,38 +215,60 @@ Candidate::operator string() const {
 	return line.str();
 }
 
+bool Candidate::operator==(const Candidate &other) const {
+	return mFoundation == other.mFoundation;
+}
+
+bool Candidate::operator!=(const Candidate &other) const {
+	return mFoundation != other.mFoundation;
+}
+
+bool Candidate::isResolved() const { return mFamily != Family::Unresolved; }
+
+Candidate::Family Candidate::family() const { return mFamily; }
+
+std::optional<string> Candidate::address() const {
+	return isResolved() ? std::make_optional(mAddress) : nullopt;
+}
+
+std::optional<uint16_t> Candidate::port() const {
+	return isResolved() ? std::make_optional(mPort) : nullopt;
+}
+
 } // namespace rtc
 
 std::ostream &operator<<(std::ostream &out, const rtc::Candidate &candidate) {
 	return out << std::string(candidate);
 }
 
-std::ostream &operator<<(std::ostream &out, const rtc::CandidateType &type) {
+std::ostream &operator<<(std::ostream &out, const rtc::Candidate::Type &type) {
 	switch (type) {
-	case rtc::CandidateType::Host:
-		return out << "Host";
-	case rtc::CandidateType::PeerReflexive:
-		return out << "PeerReflexive";
-	case rtc::CandidateType::Relayed:
-		return out << "Relayed";
-	case rtc::CandidateType::ServerReflexive:
-		return out << "ServerReflexive";
+	case rtc::Candidate::Type::Host:
+		return out << "host";
+	case rtc::Candidate::Type::PeerReflexive:
+		return out << "prflx";
+	case rtc::Candidate::Type::ServerReflexive:
+		return out << "srflx";
+	case rtc::Candidate::Type::Relayed:
+		return out << "relay";
 	default:
-		return out << "Unknown";
+		return out << "unknown";
 	}
 }
 
-std::ostream &operator<<(std::ostream &out, const rtc::CandidateTransportType &transportType) {
+std::ostream &operator<<(std::ostream &out, const rtc::Candidate::TransportType &transportType) {
 	switch (transportType) {
-	case rtc::CandidateTransportType::TcpActive:
-		return out << "TcpActive";
-	case rtc::CandidateTransportType::TcpPassive:
-		return out << "TcpPassive";
-	case rtc::CandidateTransportType::TcpSo:
-		return out << "TcpSo";
-	case rtc::CandidateTransportType::Udp:
-		return out << "Udp";
+	case rtc::Candidate::TransportType::Udp:
+		return out << "UDP";
+	case rtc::Candidate::TransportType::TcpActive:
+		return out << "TCP_active";
+	case rtc::Candidate::TransportType::TcpPassive:
+		return out << "TCP_passive";
+	case rtc::Candidate::TransportType::TcpSo:
+		return out << "TCP_so";
+	case rtc::Candidate::TransportType::TcpUnknown:
+		return out << "TCP_unknown";
 	default:
-		return out << "Unknown";
+		return out << "unknown";
 	}
 }

src/capi.cpp

@@ -195,12 +195,42 @@ template <typename F> int wrap(F func) {
 		return RTC_ERR_SUCCESS;                                                                    \
 	})
 
-class plog_appender : public plog::IAppender {
-public:
-	plog_appender(rtcLogCallbackFunc cb = nullptr) { set_callback(cb); }
+int copyAndReturn(string s, char *buffer, int size) {
+	if (!buffer)
+		return int(s.size() + 1);
 
-	void set_callback(rtcLogCallbackFunc cb) {
-		std::lock_guard lock(mutex);
+	if (size < int(s.size()))
+		return RTC_ERR_TOO_SMALL;
+
+	std::copy(s.begin(), s.end(), buffer);
+	buffer[s.size()] = '\0';
+	return int(s.size() + 1);
+}
+
+int copyAndReturn(binary b, char *buffer, int size) {
+	if (!buffer)
+		return int(b.size());
+
+	if (size < int(b.size()))
+		return RTC_ERR_TOO_SMALL;
+
+	auto data = reinterpret_cast<const char *>(b.data());
+	std::copy(data, data + b.size(), buffer);
+	buffer[b.size()] = '\0';
+	return int(b.size());
+}
+
+class plogAppender : public plog::IAppender {
+public:
+	plogAppender(rtcLogCallbackFunc cb = nullptr) { setCallback(cb); }
+
+	plogAppender(plogAppender &&appender) : callback(nullptr) {
+		std::lock_guard lock(appender.callbackMutex);
+		std::swap(appender.callback, callback);
+	}
+
+	void setCallback(rtcLogCallbackFunc cb) {
+		std::lock_guard lock(callbackMutex);
 		callback = cb;
 	}
 
@@ -215,7 +245,7 @@ public:
 #else
 		std::string str = formatted;
 #endif
-		std::lock_guard lock(mutex);
+		std::lock_guard lock(callbackMutex);
 		if (callback)
 			callback(static_cast<rtcLogLevel>(record.getSeverity()), str.c_str());
 		else
@@ -224,18 +254,24 @@ public:
 
 private:
 	rtcLogCallbackFunc callback;
+	std::mutex callbackMutex;
 };
 
 } // namespace
 
 void rtcInitLogger(rtcLogLevel level, rtcLogCallbackFunc cb) {
-	static std::optional<plog_appender> appender;
-	if (appender)
-		appender->set_callback(cb);
-	else if (cb)
-		appender.emplace(plog_appender(cb));
-
-	InitLogger(static_cast<plog::Severity>(level), appender ? &appender.value() : nullptr);
+	static std::optional<plogAppender> appender;
+	const auto severity = static_cast<plog::Severity>(level);
+	std::lock_guard lock(mutex);
+	if (appender) {
+		appender->setCallback(cb);
+		InitLogger(severity, nullptr); // change the severity
+	} else if (cb) {
+		appender.emplace(plogAppender(cb));
+		InitLogger(severity, &appender.value());
+	} else {
+		InitLogger(severity, nullptr); // log to stdout
+	}
 }
 
 void rtcSetUserPointer(int i, void *ptr) { setUserPointer(i, ptr); }
@@ -268,45 +304,49 @@ int rtcDeletePeerConnection(int pc) {
 	});
 }
 
-int rtcAddDataChannel(int pc, const char *label) {
-	return rtcAddDataChannelExt(pc, label, nullptr, nullptr);
-}
+int rtcAddDataChannel(int pc, const char *label) { return rtcAddDataChannelEx(pc, label, nullptr); }
 
-int rtcAddDataChannelExt(int pc, const char *label, const char *protocol,
-                         const rtcReliability *reliability) {
+int rtcAddDataChannelEx(int pc, const char *label, const rtcDataChannelInit *init) {
 	return WRAP({
-		Reliability r = {};
-		if (reliability) {
-			r.unordered = reliability->unordered;
+		DataChannelInit dci = {};
+		if (init) {
+			auto *reliability = &init->reliability;
+			dci.reliability.unordered = reliability->unordered;
 			if (reliability->unreliable) {
 				if (reliability->maxPacketLifeTime > 0) {
-					r.type = Reliability::Type::Timed;
-					r.rexmit = milliseconds(reliability->maxPacketLifeTime);
+					dci.reliability.type = Reliability::Type::Timed;
+					dci.reliability.rexmit = milliseconds(reliability->maxPacketLifeTime);
 				} else {
-					r.type = Reliability::Type::Rexmit;
-					r.rexmit = int(reliability->maxRetransmits);
+					dci.reliability.type = Reliability::Type::Rexmit;
+					dci.reliability.rexmit = int(reliability->maxRetransmits);
 				}
 			} else {
-				r.type = Reliability::Type::Reliable;
+				dci.reliability.type = Reliability::Type::Reliable;
 			}
+
+			dci.negotiated = init->negotiated;
+			dci.id = init->manualStream ? std::make_optional(init->stream) : nullopt;
+			dci.protocol = init->protocol ? init->protocol : "";
 		}
+
 		auto peerConnection = getPeerConnection(pc);
-		int dc = emplaceDataChannel(peerConnection->addDataChannel(
-		    string(label ? label : ""), string(protocol ? protocol : ""), r));
+		int dc = emplaceDataChannel(
+		    peerConnection->addDataChannel(string(label ? label : ""), std::move(dci)));
+
 		if (auto ptr = getUserPointer(pc))
 			rtcSetUserPointer(dc, *ptr);
+
 		return dc;
 	});
 }
 
 int rtcCreateDataChannel(int pc, const char *label) {
-	return rtcCreateDataChannelExt(pc, label, nullptr, nullptr);
+	return rtcCreateDataChannelEx(pc, label, nullptr);
 }
 
-int rtcCreateDataChannelExt(int pc, const char *label, const char *protocol,
-                            const rtcReliability *reliability) {
-	int dc = rtcAddDataChannelExt(pc, label, protocol, reliability);
-	rtcSetLocalDescription(pc);
+int rtcCreateDataChannelEx(int pc, const char *label, const rtcDataChannelInit *init) {
+	int dc = rtcAddDataChannelEx(pc, label, init);
+	rtcSetLocalDescription(pc, NULL);
 	return dc;
 }
 
@@ -334,6 +374,7 @@ int rtcAddTrack(int pc, const char *mediaDescriptionSdp) {
 		int tr = emplaceTrack(peerConnection->addTrack(std::move(media)));
 		if (auto ptr = getUserPointer(pc))
 			rtcSetUserPointer(tr, *ptr);
+
 		return tr;
 	});
 }
@@ -355,19 +396,7 @@ int rtcDeleteTrack(int tr) {
 int rtcGetTrackDescription(int tr, char *buffer, int size) {
 	return WRAP({
 		auto track = getTrack(tr);
-
-		if (size <= 0)
-			return 0;
-
-		if (!buffer)
-			throw std::invalid_argument("Unexpected null pointer for buffer");
-
-		string description(track->description());
-		const char *data = description.data();
-		size = std::min(size - 1, int(description.size()));
-		std::copy(data, data + size, buffer);
-		buffer[size] = '\0';
-		return int(size + 1);
+		return copyAndReturn(track->description(), buffer, size);
 	});
 }
 
@@ -411,7 +440,7 @@ int rtcSetLocalDescriptionCallback(int pc, rtcDescriptionCallbackFunc cb) {
 		if (cb)
 			peerConnection->onLocalDescription([pc, cb](Description desc) {
 				if (auto ptr = getUserPointer(pc))
-					cb(string(desc).c_str(), desc.typeString().c_str(), *ptr);
+					cb(pc, string(desc).c_str(), desc.typeString().c_str(), *ptr);
 			});
 		else
 			peerConnection->onLocalDescription(nullptr);
@@ -424,7 +453,7 @@ int rtcSetLocalCandidateCallback(int pc, rtcCandidateCallbackFunc cb) {
 		if (cb)
 			peerConnection->onLocalCandidate([pc, cb](Candidate cand) {
 				if (auto ptr = getUserPointer(pc))
-					cb(cand.candidate().c_str(), cand.mid().c_str(), *ptr);
+					cb(pc, cand.candidate().c_str(), cand.mid().c_str(), *ptr);
 			});
 		else
 			peerConnection->onLocalCandidate(nullptr);
@@ -437,7 +466,7 @@ int rtcSetStateChangeCallback(int pc, rtcStateChangeCallbackFunc cb) {
 		if (cb)
 			peerConnection->onStateChange([pc, cb](PeerConnection::State state) {
 				if (auto ptr = getUserPointer(pc))
-					cb(static_cast<rtcState>(state), *ptr);
+					cb(pc, static_cast<rtcState>(state), *ptr);
 			});
 		else
 			peerConnection->onStateChange(nullptr);
@@ -450,7 +479,20 @@ int rtcSetGatheringStateChangeCallback(int pc, rtcGatheringStateCallbackFunc cb)
 		if (cb)
 			peerConnection->onGatheringStateChange([pc, cb](PeerConnection::GatheringState state) {
 				if (auto ptr = getUserPointer(pc))
-					cb(static_cast<rtcGatheringState>(state), *ptr);
+					cb(pc, static_cast<rtcGatheringState>(state), *ptr);
+			});
+		else
+			peerConnection->onGatheringStateChange(nullptr);
+	});
+}
+
+int rtcSetSignalingStateChangeCallback(int pc, rtcSignalingStateCallbackFunc cb) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+		if (cb)
+			peerConnection->onSignalingStateChange([pc, cb](PeerConnection::SignalingState state) {
+				if (auto ptr = getUserPointer(pc))
+					cb(pc, static_cast<rtcSignalingState>(state), *ptr);
 			});
 		else
 			peerConnection->onGatheringStateChange(nullptr);
@@ -465,7 +507,7 @@ int rtcSetDataChannelCallback(int pc, rtcDataChannelCallbackFunc cb) {
 				int dc = emplaceDataChannel(dataChannel);
 				if (auto ptr = getUserPointer(pc)) {
 					rtcSetUserPointer(dc, *ptr);
-					cb(dc, *ptr);
+					cb(pc, dc, *ptr);
 				}
 			});
 		else
@@ -481,7 +523,7 @@ int rtcSetTrackCallback(int pc, rtcTrackCallbackFunc cb) {
 				int tr = emplaceTrack(track);
 				if (auto ptr = getUserPointer(pc)) {
 					rtcSetUserPointer(tr, *ptr);
-					cb(tr, *ptr);
+					cb(pc, tr, *ptr);
 				}
 			});
 		else
@@ -489,10 +531,11 @@ int rtcSetTrackCallback(int pc, rtcTrackCallbackFunc cb) {
 	});
 }
 
-int rtcSetLocalDescription(int pc) {
+int rtcSetLocalDescription(int pc, const char *type) {
 	return WRAP({
 		auto peerConnection = getPeerConnection(pc);
-		peerConnection->setLocalDescription();
+		peerConnection->setLocalDescription(type ? Description::stringToType(type)
+		                                         : Description::Type::Unspec);
 	});
 }
 
@@ -518,23 +561,36 @@ int rtcAddRemoteCandidate(int pc, const char *cand, const char *mid) {
 	});
 }
 
+int rtcGetLocalDescription(int pc, char *buffer, int size) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+
+		if (auto desc = peerConnection->localDescription())
+			return copyAndReturn(string(*desc), buffer, size);
+		else
+			return RTC_ERR_NOT_AVAIL;
+	});
+}
+
+int rtcGetRemoteDescription(int pc, char *buffer, int size) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+
+		if (auto desc = peerConnection->remoteDescription())
+			return copyAndReturn(string(*desc), buffer, size);
+		else
+			return RTC_ERR_NOT_AVAIL;
+	});
+}
+
 int rtcGetLocalAddress(int pc, char *buffer, int size) {
 	return WRAP({
 		auto peerConnection = getPeerConnection(pc);
 
-		if (size <= 0)
-			return 0;
-
-		if (!buffer)
-			throw std::invalid_argument("Unexpected null pointer for buffer");
-
-		if (auto addr = peerConnection->localAddress()) {
-			const char *data = addr->data();
-			size = std::min(size - 1, int(addr->size()));
-			std::copy(data, data + size, buffer);
-			buffer[size] = '\0';
-			return size + 1;
-		}
+		if (auto addr = peerConnection->localAddress())
+			return copyAndReturn(std::move(*addr), buffer, size);
+		else
+			return RTC_ERR_NOT_AVAIL;
 	});
 }
 
@@ -542,57 +598,52 @@ int rtcGetRemoteAddress(int pc, char *buffer, int size) {
 	return WRAP({
 		auto peerConnection = getPeerConnection(pc);
 
-		if (size <= 0)
-			return 0;
+		if (auto addr = peerConnection->remoteAddress())
+			return copyAndReturn(std::move(*addr), buffer, size);
+		else
+			return RTC_ERR_NOT_AVAIL;
+	});
+}
 
-		if (!buffer)
-			throw std::invalid_argument("Unexpected null pointer for buffer");
+int rtcGetSelectedCandidatePair(int pc, char *local, int localSize, char *remote, int remoteSize) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
 
-		if (auto addr = peerConnection->remoteAddress()) {
-			const char *data = addr->data();
-			size = std::min(size - 1, int(addr->size()));
-			std::copy(data, data + size, buffer);
-			buffer[size] = '\0';
-			return int(size + 1);
-		}
+		Candidate localCand;
+		Candidate remoteCand;
+		if (!peerConnection->getSelectedCandidatePair(&localCand, &remoteCand))
+			return RTC_ERR_NOT_AVAIL;
+
+		int localRet = copyAndReturn(string(localCand), local, localSize);
+		if (localRet < 0)
+			return localRet;
+
+		int remoteRet = copyAndReturn(string(remoteCand), remote, remoteSize);
+		if (remoteRet < 0)
+			return remoteRet;
+
+		return std::max(localRet, remoteRet);
+	});
+}
+
+int rtcGetDataChannelStream(int dc) {
+	return WRAP({
+		auto dataChannel = getDataChannel(dc);
+		return int(dataChannel->id());
 	});
 }
 
 int rtcGetDataChannelLabel(int dc, char *buffer, int size) {
 	return WRAP({
 		auto dataChannel = getDataChannel(dc);
-
-		if (size <= 0)
-			return 0;
-
-		if (!buffer)
-			throw std::invalid_argument("Unexpected null pointer for buffer");
-
-		string label = dataChannel->label();
-		const char *data = label.data();
-		size = std::min(size - 1, int(label.size()));
-		std::copy(data, data + size, buffer);
-		buffer[size] = '\0';
-		return int(size + 1);
+		return copyAndReturn(dataChannel->label(), buffer, size);
 	});
 }
 
 int rtcGetDataChannelProtocol(int dc, char *buffer, int size) {
 	return WRAP({
 		auto dataChannel = getDataChannel(dc);
-
-		if (size <= 0)
-			return 0;
-
-		if (!buffer)
-			throw std::invalid_argument("Unexpected null pointer for buffer");
-
-		string protocol = dataChannel->protocol();
-		const char *data = protocol.data();
-		size = std::min(size - 1, int(protocol.size()));
-		std::copy(data, data + size, buffer);
-		buffer[size] = '\0';
-		return int(size + 1);
+		return copyAndReturn(dataChannel->protocol(), buffer, size);
 	});
 }
 
@@ -603,19 +654,19 @@ int rtcGetDataChannelReliability(int dc, rtcReliability *reliability) {
 		if (!reliability)
 			throw std::invalid_argument("Unexpected null pointer for reliability");
 
-		Reliability r = dataChannel->reliability();
+		Reliability dcr = dataChannel->reliability();
 		std::memset(reliability, 0, sizeof(*reliability));
-		reliability->unordered = r.unordered;
-		if (r.type == Reliability::Type::Timed) {
+		reliability->unordered = dcr.unordered;
+		if (dcr.type == Reliability::Type::Timed) {
 			reliability->unreliable = true;
-			reliability->maxPacketLifeTime = unsigned(std::get<milliseconds>(r.rexmit).count());
-		} else if (r.type == Reliability::Type::Rexmit) {
+			reliability->maxPacketLifeTime = unsigned(std::get<milliseconds>(dcr.rexmit).count());
+		} else if (dcr.type == Reliability::Type::Rexmit) {
 			reliability->unreliable = true;
-			reliability->maxRetransmits = unsigned(std::get<int>(r.rexmit));
+			reliability->maxRetransmits = unsigned(std::get<int>(dcr.rexmit));
 		} else {
 			reliability->unreliable = false;
 		}
-		return 0;
+		return RTC_ERR_SUCCESS;
 	});
 }
 
@@ -625,7 +676,7 @@ int rtcSetOpenCallback(int id, rtcOpenCallbackFunc cb) {
 		if (cb)
 			channel->onOpen([id, cb]() {
 				if (auto ptr = getUserPointer(id))
-					cb(*ptr);
+					cb(id, *ptr);
 			});
 		else
 			channel->onOpen(nullptr);
@@ -638,7 +689,7 @@ int rtcSetClosedCallback(int id, rtcClosedCallbackFunc cb) {
 		if (cb)
 			channel->onClosed([id, cb]() {
 				if (auto ptr = getUserPointer(id))
-					cb(*ptr);
+					cb(id, *ptr);
 			});
 		else
 			channel->onClosed(nullptr);
@@ -651,7 +702,7 @@ int rtcSetErrorCallback(int id, rtcErrorCallbackFunc cb) {
 		if (cb)
 			channel->onError([id, cb](string error) {
 				if (auto ptr = getUserPointer(id))
-					cb(error.c_str(), *ptr);
+					cb(id, error.c_str(), *ptr);
 			});
 		else
 			channel->onError(nullptr);
@@ -665,11 +716,11 @@ int rtcSetMessageCallback(int id, rtcMessageCallbackFunc cb) {
 			channel->onMessage(
 			    [id, cb](binary b) {
 				    if (auto ptr = getUserPointer(id))
-					    cb(reinterpret_cast<const char *>(b.data()), int(b.size()), *ptr);
+					    cb(id, reinterpret_cast<const char *>(b.data()), int(b.size()), *ptr);
 			    },
 			    [id, cb](string s) {
 				    if (auto ptr = getUserPointer(id))
-					    cb(s.c_str(), -int(s.size() + 1), *ptr);
+					    cb(id, s.c_str(), -int(s.size() + 1), *ptr);
 			    });
 		else
 			channel->onMessage(nullptr);
@@ -716,7 +767,7 @@ int rtcSetBufferedAmountLowCallback(int id, rtcBufferedAmountLowCallbackFunc cb)
 		if (cb)
 			channel->onBufferedAmountLow([id, cb]() {
 				if (auto ptr = getUserPointer(id))
-					cb(*ptr);
+					cb(id, *ptr);
 			});
 		else
 			channel->onBufferedAmountLow(nullptr);
@@ -731,12 +782,12 @@ int rtcSetAvailableCallback(int id, rtcAvailableCallbackFunc cb) {
 	return WRAP({
 		auto channel = getChannel(id);
 		if (cb)
-			channel->onOpen([id, cb]() {
+			channel->onAvailable([id, cb]() {
 				if (auto ptr = getUserPointer(id))
-					cb(*ptr);
+					cb(id, *ptr);
 			});
 		else
-			channel->onOpen(nullptr);
+			channel->onAvailable(nullptr);
 	});
 }
 
@@ -747,34 +798,38 @@ int rtcReceiveMessage(int id, char *buffer, int *size) {
 		if (!size)
 			throw std::invalid_argument("Unexpected null pointer for size");
 
-		if (!buffer && *size != 0)
-			throw std::invalid_argument("Unexpected null pointer for buffer");
+		*size = std::abs(*size);
 
-		if (auto message = channel->receive())
-			return std::visit( //
-			    overloaded{    //
-			               [&](binary b) {
-				               if (*size > 0) {
-					               *size = std::min(*size, int(b.size()));
-					               auto data = reinterpret_cast<const char *>(b.data());
-					               std::copy(data, data + *size, buffer);
-				               }
-				               return 1;
-			               },
-			               [&](string s) {
-				               if (*size > 0) {
-					               int len = std::min(*size - 1, int(s.size()));
-					               if (len >= 0) {
-						               std::copy(s.data(), s.data() + len, buffer);
-						               buffer[len] = '\0';
-					               }
-					               *size = -(len + 1);
-				               }
-				               return 1;
-			               }},
-			    *message);
-		else
-			return 0;
+		auto message = channel->peek();
+		if (!message)
+			return RTC_ERR_NOT_AVAIL;
+
+		return std::visit( //
+		    overloaded{
+		        [&](binary b) {
+			        int ret = copyAndReturn(std::move(b), buffer, *size);
+			        if (ret >= 0) {
+				        channel->receive(); // discard
+				        *size = ret;
+				        return RTC_ERR_SUCCESS;
+			        } else {
+				        *size = int(b.size());
+				        return ret;
+			        }
+		        },
+		        [&](string s) {
+			        int ret = copyAndReturn(std::move(s), buffer, *size);
+			        if (ret >= 0) {
+				        channel->receive(); // discard
+				        *size = -ret;
+				        return RTC_ERR_SUCCESS;
+			        } else {
+				        *size = -int(s.size() + 1);
+				        return ret;
+			        }
+		        },
+		    },
+		    *message);
 	});
 }
 

src/certificate.cpp

@@ -99,7 +99,11 @@ certificate_ptr make_certificate_impl(string commonName) {
 	unique_ptr<gnutls_x509_crt_t, decltype(&free_crt)> crt(new_crt(), free_crt);
 	unique_ptr<gnutls_x509_privkey_t, decltype(&free_privkey)> privkey(new_privkey(), free_privkey);
 
+#ifdef RSA_KEY_BITS_2048
+	const unsigned int bits = 2048;
+#else
 	const unsigned int bits = gnutls_sec_param_to_pk_bits(GNUTLS_PK_RSA, GNUTLS_SEC_PARAM_HIGH);
+#endif
 	gnutls::check(gnutls_x509_privkey_generate(*privkey, GNUTLS_PK_RSA, bits, 0),
 	              "Unable to generate key pair");
 
@@ -149,22 +153,23 @@ Certificate::Certificate(string crt_pem, string key_pem) {
 	mFingerprint = make_fingerprint(mX509.get());
 }
 
-Certificate::Certificate(shared_ptr<X509> x509, shared_ptr<EVP_PKEY> pkey) :
-	mX509(std::move(x509)), mPKey(std::move(pkey))
-{
+Certificate::Certificate(shared_ptr<X509> x509, shared_ptr<EVP_PKEY> pkey)
+    : mX509(std::move(x509)), mPKey(std::move(pkey)) {
 	mFingerprint = make_fingerprint(mX509.get());
 }
 
 string Certificate::fingerprint() const { return mFingerprint; }
 
-std::tuple<X509 *, EVP_PKEY *> Certificate::credentials() const { return {mX509.get(), mPKey.get()}; }
+std::tuple<X509 *, EVP_PKEY *> Certificate::credentials() const {
+	return {mX509.get(), mPKey.get()};
+}
 
 string make_fingerprint(X509 *x509) {
 	const size_t size = 32;
-    unsigned char buffer[size];
-    unsigned int len = size;
-    if (!X509_digest(x509, EVP_sha256(), buffer, &len))
-      throw std::runtime_error("X509 fingerprint error");
+	unsigned char buffer[size];
+	unsigned int len = size;
+	if (!X509_digest(x509, EVP_sha256(), buffer, &len))
+		throw std::runtime_error("X509 fingerprint error");
 
 	std::ostringstream oss;
 	oss << std::hex << std::uppercase << std::setfill('0');
@@ -182,15 +187,19 @@ certificate_ptr make_certificate_impl(string commonName) {
 	shared_ptr<X509> x509(X509_new(), X509_free);
 	shared_ptr<EVP_PKEY> pkey(EVP_PKEY_new(), EVP_PKEY_free);
 
-    unique_ptr<RSA, decltype(&RSA_free)> rsa(RSA_new(), RSA_free);
+	unique_ptr<RSA, decltype(&RSA_free)> rsa(RSA_new(), RSA_free);
 	unique_ptr<BIGNUM, decltype(&BN_free)> exponent(BN_new(), BN_free);
 	unique_ptr<BIGNUM, decltype(&BN_free)> serial_number(BN_new(), BN_free);
-    unique_ptr<X509_NAME, decltype(&X509_NAME_free)> name(X509_NAME_new(), X509_NAME_free);
+	unique_ptr<X509_NAME, decltype(&X509_NAME_free)> name(X509_NAME_new(), X509_NAME_free);
 
 	if (!x509 || !pkey || !rsa || !exponent || !serial_number || !name)
 		throw std::runtime_error("Unable allocate structures for certificate generation");
 
-	const int bits = 4096;
+#ifdef RSA_KEY_BITS_2048
+	const int bits = 2048;
+#else
+	const int bits = 3072;
+#endif
 	const unsigned int e = 65537; // 2^16 + 1
 
 	if (!pkey || !rsa || !exponent || !BN_set_word(exponent.get(), e) ||

src/channel.cpp

@@ -26,13 +26,9 @@ size_t Channel::bufferedAmount() const { return mBufferedAmount; }
 
 size_t Channel::availableAmount() const { return 0; }
 
-void Channel::onOpen(std::function<void()> callback) {
-	mOpenCallback = callback;
-}
+void Channel::onOpen(std::function<void()> callback) { mOpenCallback = callback; }
 
-void Channel::onClosed(std::function<void()> callback) {
-	mClosedCallback = callback;
-}
+void Channel::onClosed(std::function<void()> callback) { mClosedCallback = callback; }
 
 void Channel::onError(std::function<void(string error)> callback) { mErrorCallback = callback; }
 
@@ -57,9 +53,7 @@ void Channel::onBufferedAmountLow(std::function<void()> callback) {
 
 void Channel::setBufferedAmountLowThreshold(size_t amount) { mBufferedAmountLowThreshold = amount; }
 
-void Channel::onAvailable(std::function<void()> callback) {
-	mAvailableCallback = callback;
-}
+void Channel::onAvailable(std::function<void()> callback) { mAvailableCallback = callback; }
 
 void Channel::triggerOpen() { mOpenCallback(); }
 
@@ -96,4 +90,3 @@ void Channel::resetCallbacks() {
 }
 
 } // namespace rtc
-

src/datachannel.cpp

@@ -72,24 +72,18 @@ struct CloseMessage {
 };
 #pragma pack(pop)
 
-DataChannel::DataChannel(weak_ptr<PeerConnection> pc, unsigned int stream, string label,
+DataChannel::DataChannel(weak_ptr<PeerConnection> pc, uint16_t stream, string label,
                          string protocol, Reliability reliability)
     : mPeerConnection(pc), mStream(stream), mLabel(std::move(label)),
       mProtocol(std::move(protocol)),
       mReliability(std::make_shared<Reliability>(std::move(reliability))),
       mRecvQueue(RECV_QUEUE_LIMIT, message_size_func) {}
 
-DataChannel::DataChannel(weak_ptr<PeerConnection> pc, weak_ptr<SctpTransport> transport,
-                         unsigned int stream)
-    : mPeerConnection(pc), mSctpTransport(transport), mStream(stream),
-      mReliability(std::make_shared<Reliability>()),
-      mRecvQueue(RECV_QUEUE_LIMIT, message_size_func) {}
+DataChannel::~DataChannel() { close(); }
 
-DataChannel::~DataChannel() {
-	close();
-}
+uint16_t DataChannel::stream() const { return mStream; }
 
-unsigned int DataChannel::stream() const { return mStream; }
+uint16_t DataChannel::id() const { return uint16_t(mStream); }
 
 string DataChannel::label() const { return mLabel; }
 
@@ -123,14 +117,29 @@ bool DataChannel::send(const byte *data, size_t size) {
 
 std::optional<message_variant> DataChannel::receive() {
 	while (auto next = mRecvQueue.tryPop()) {
-		message_ptr message = std::move(*next);
-		if (message->type == Message::Control) {
-			auto raw = reinterpret_cast<const uint8_t *>(message->data());
-			if (!message->empty() && raw[0] == MESSAGE_CLOSE)
-				remoteClose();
-		} else {
+		message_ptr message = *next;
+		if (message->type != Message::Control)
 			return to_variant(std::move(*message));
-		}
+
+		auto raw = reinterpret_cast<const uint8_t *>(message->data());
+		if (!message->empty() && raw[0] == MESSAGE_CLOSE)
+			remoteClose();
+	}
+
+	return nullopt;
+}
+
+std::optional<message_variant> DataChannel::peek() {
+	while (auto next = mRecvQueue.peek()) {
+		message_ptr message = *next;
+		if (message->type != Message::Control)
+			return to_variant(std::move(*message));
+
+		auto raw = reinterpret_cast<const uint8_t *>(message->data());
+		if (!message->empty() && raw[0] == MESSAGE_CLOSE)
+			remoteClose();
+
+		mRecvQueue.tryPop();
 	}
 
 	return nullopt;
@@ -156,43 +165,12 @@ size_t DataChannel::availableAmount() const { return mRecvQueue.amount(); }
 void DataChannel::open(shared_ptr<SctpTransport> transport) {
 	mSctpTransport = transport;
 
-	uint8_t channelType;
-	uint32_t reliabilityParameter;
-	switch (mReliability->type) {
-	case Reliability::Type::Rexmit:
-		channelType = CHANNEL_PARTIAL_RELIABLE_REXMIT;
-		reliabilityParameter = uint32_t(std::get<int>(mReliability->rexmit));
-		break;
+	if (!mIsOpen.exchange(true))
+		triggerOpen();
+}
 
-	case Reliability::Type::Timed:
-		channelType = CHANNEL_PARTIAL_RELIABLE_TIMED;
-		reliabilityParameter = uint32_t(std::get<milliseconds>(mReliability->rexmit).count());
-		break;
-
-	default:
-		channelType = CHANNEL_RELIABLE;
-		reliabilityParameter = 0;
-		break;
-	}
-
-	if (mReliability->unordered)
-		channelType |= 0x80;
-
-	const size_t len = sizeof(OpenMessage) + mLabel.size() + mProtocol.size();
-	binary buffer(len, byte(0));
-	auto &open = *reinterpret_cast<OpenMessage *>(buffer.data());
-	open.type = MESSAGE_OPEN;
-	open.channelType = channelType;
-	open.priority = htons(0);
-	open.reliabilityParameter = htonl(reliabilityParameter);
-	open.labelLength = htons(uint16_t(mLabel.size()));
-	open.protocolLength = htons(uint16_t(mProtocol.size()));
-
-	auto end = reinterpret_cast<char *>(buffer.data() + sizeof(OpenMessage));
-	std::copy(mLabel.begin(), mLabel.end(), end);
-	std::copy(mProtocol.begin(), mProtocol.end(), end + mLabel.size());
-
-	transport->send(make_message(buffer.begin(), buffer.end(), Message::Control, mStream));
+void DataChannel::processOpenMessage(message_ptr) {
+	PLOG_WARNING << "Received an open message for a user-negotiated DataChannel, ignoring";
 }
 
 bool DataChannel::outgoing(message_ptr message) {
@@ -252,7 +230,62 @@ void DataChannel::incoming(message_ptr message) {
 	}
 }
 
-void DataChannel::processOpenMessage(message_ptr message) {
+NegociatedDataChannel::NegociatedDataChannel(std::weak_ptr<PeerConnection> pc, uint16_t stream,
+                                             string label, string protocol, Reliability reliability)
+    : DataChannel(pc, stream, std::move(label), std::move(protocol), std::move(reliability)) {}
+
+NegociatedDataChannel::NegociatedDataChannel(std::weak_ptr<PeerConnection> pc,
+                                             std::weak_ptr<SctpTransport> transport,
+                                             uint16_t stream)
+    : DataChannel(pc, stream, "", "", {}) {
+	mSctpTransport = transport;
+}
+
+NegociatedDataChannel::~NegociatedDataChannel() {}
+
+void NegociatedDataChannel::open(shared_ptr<SctpTransport> transport) {
+	mSctpTransport = transport;
+
+	uint8_t channelType;
+	uint32_t reliabilityParameter;
+	switch (mReliability->type) {
+	case Reliability::Type::Rexmit:
+		channelType = CHANNEL_PARTIAL_RELIABLE_REXMIT;
+		reliabilityParameter = uint32_t(std::get<int>(mReliability->rexmit));
+		break;
+
+	case Reliability::Type::Timed:
+		channelType = CHANNEL_PARTIAL_RELIABLE_TIMED;
+		reliabilityParameter = uint32_t(std::get<milliseconds>(mReliability->rexmit).count());
+		break;
+
+	default:
+		channelType = CHANNEL_RELIABLE;
+		reliabilityParameter = 0;
+		break;
+	}
+
+	if (mReliability->unordered)
+		channelType |= 0x80;
+
+	const size_t len = sizeof(OpenMessage) + mLabel.size() + mProtocol.size();
+	binary buffer(len, byte(0));
+	auto &open = *reinterpret_cast<OpenMessage *>(buffer.data());
+	open.type = MESSAGE_OPEN;
+	open.channelType = channelType;
+	open.priority = htons(0);
+	open.reliabilityParameter = htonl(reliabilityParameter);
+	open.labelLength = htons(uint16_t(mLabel.size()));
+	open.protocolLength = htons(uint16_t(mProtocol.size()));
+
+	auto end = reinterpret_cast<char *>(buffer.data() + sizeof(OpenMessage));
+	std::copy(mLabel.begin(), mLabel.end(), end);
+	std::copy(mProtocol.begin(), mProtocol.end(), end + mLabel.size());
+
+	transport->send(make_message(buffer.begin(), buffer.end(), Message::Control, mStream));
+}
+
+void NegociatedDataChannel::processOpenMessage(message_ptr message) {
 	auto transport = mSctpTransport.lock();
 	if (!transport)
 		throw std::runtime_error("DataChannel has no transport");
@@ -273,7 +306,7 @@ void DataChannel::processOpenMessage(message_ptr message) {
 	mLabel.assign(end, open.labelLength);
 	mProtocol.assign(end + open.labelLength, open.protocolLength);
 
-	mReliability->unordered = (open.reliabilityParameter & 0x80) != 0;
+	mReliability->unordered = (open.channelType & 0x80) != 0;
 	switch (open.channelType & 0x7F) {
 	case CHANNEL_PARTIAL_RELIABLE_REXMIT:
 		mReliability->type = Reliability::Type::Rexmit;
@@ -294,8 +327,8 @@ void DataChannel::processOpenMessage(message_ptr message) {
 
 	transport->send(make_message(buffer.begin(), buffer.end(), Message::Control, mStream));
 
-	mIsOpen = true;
-	triggerOpen();
+	if (!mIsOpen.exchange(true))
+		triggerOpen();
 }
 
 } // namespace rtc

src/description.cpp

@@ -1,6 +1,6 @@
 /**
  * Copyright (c) 2019-2020 Paul-Louis Ageneau
- * Copyright (c) 2020 Staz M
+ * Copyright (c) 2020 Staz Modrzynski
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -26,15 +26,16 @@
 #include <iostream>
 #include <random>
 #include <sstream>
+#include <unordered_map>
 
 using std::shared_ptr;
-using std::size_t;
-using std::string;
-using std::string_view;
 using std::chrono::system_clock;
 
 namespace {
 
+using std::string;
+using std::string_view;
+
 inline bool match_prefix(string_view str, string_view prefix) {
 	return str.size() >= prefix.size() &&
 	       std::mismatch(prefix.begin(), prefix.end(), str.begin()).first == prefix.end();
@@ -65,20 +66,10 @@ template <typename T> T to_integer(string_view s) {
 
 namespace rtc {
 
-Description::Description(const string &sdp, const string &typeString)
-    : Description(sdp, stringToType(typeString)) {}
-
-Description::Description(const string &sdp, Type type) : Description(sdp, type, Role::ActPass) {}
-
 Description::Description(const string &sdp, Type type, Role role)
     : mType(Type::Unspec), mRole(role) {
 	hintType(type);
 
-	auto seed = static_cast<unsigned int>(system_clock::now().time_since_epoch().count());
-	std::default_random_engine generator(seed);
-	std::uniform_int_distribution<uint32_t> uniform;
-	mSessionId = std::to_string(uniform(generator));
-
 	int index = -1;
 	std::shared_ptr<Entry> current;
 	std::istringstream ss(sdp);
@@ -89,14 +80,14 @@ Description::Description(const string &sdp, Type type, Role role)
 		if (line.empty())
 			continue;
 
-		// Media description line (aka m-line)
-		if (match_prefix(line, "m=")) {
-			++index;
-			string mline = line.substr(2);
-			current = createEntry(std::move(mline), std::to_string(index), Direction::Unknown);
+		if (match_prefix(line, "m=")) { // Media description line (aka m-line)
+			current = createEntry(line.substr(2), std::to_string(++index), Direction::Unknown);
 
-			// Attribute line
-		} else if (match_prefix(line, "a=")) {
+		} else if (match_prefix(line, "o=")) { // Origin line
+			std::istringstream origin(line.substr(2));
+			origin >> mUsername >> mSessionId;
+
+		} else if (match_prefix(line, "a=")) { // Attribute line
 			string attr = line.substr(2);
 			auto [key, value] = parse_pair(attr);
 
@@ -115,7 +106,7 @@ Description::Description(const string &sdp, Type type, Role role)
 					               mFingerprint->begin(),
 					               [](char c) { return char(std::toupper(c)); });
 				} else {
-					PLOG_WARNING << "Unknown SDP fingerprint type: " << value;
+					PLOG_WARNING << "Unknown SDP fingerprint format: " << value;
 				}
 			} else if (key == "ice-ufrag") {
 				mIceUfrag = value;
@@ -134,29 +125,35 @@ Description::Description(const string &sdp, Type type, Role role)
 		}
 	}
 
-	if (mIceUfrag.empty())
-		throw std::invalid_argument("Missing ice-ufrag parameter in SDP description");
+	if (mUsername.empty())
+		mUsername = "rtc";
 
-	if (mIcePwd.empty())
-		throw std::invalid_argument("Missing ice-pwd parameter in SDP description");
+	if (mSessionId.empty()) {
+		auto seed = static_cast<unsigned int>(system_clock::now().time_since_epoch().count());
+		std::default_random_engine generator(seed);
+		std::uniform_int_distribution<uint32_t> uniform;
+		mSessionId = std::to_string(uniform(generator));
+	}
 }
 
+Description::Description(const string &sdp, string typeString)
+    : Description(sdp, !typeString.empty() ? stringToType(typeString) : Type::Unspec,
+                  Role::ActPass) {}
+
 Description::Type Description::type() const { return mType; }
 
 string Description::typeString() const { return typeToString(mType); }
 
 Description::Role Description::role() const { return mRole; }
 
-string Description::roleString() const { return roleToString(mRole); }
-
 string Description::bundleMid() const {
 	// Get the mid of the first media
 	return !mEntries.empty() ? mEntries[0]->mid() : "0";
 }
 
-string Description::iceUfrag() const { return mIceUfrag; }
+std::optional<string> Description::iceUfrag() const { return mIceUfrag; }
 
-string Description::icePwd() const { return mIcePwd; }
+std::optional<string> Description::icePwd() const { return mIcePwd; }
 
 std::optional<string> Description::fingerprint() const { return mFingerprint; }
 
@@ -174,10 +171,29 @@ void Description::setFingerprint(string fingerprint) {
 	mFingerprint.emplace(std::move(fingerprint));
 }
 
+bool Description::hasCandidate(const Candidate &candidate) const {
+	for (const Candidate &other : mCandidates)
+		if (candidate == other)
+			return true;
+
+	return false;
+}
+
 void Description::addCandidate(Candidate candidate) {
+	candidate.hintMid(bundleMid());
+
+	for (const Candidate &other : mCandidates)
+		if (candidate == other)
+			return;
+
 	mCandidates.emplace_back(std::move(candidate));
 }
 
+void Description::addCandidates(std::vector<Candidate> candidates) {
+	for (Candidate candidate : candidates)
+		addCandidate(std::move(candidate));
+}
+
 void Description::endCandidates() { mEnded = true; }
 
 std::vector<Candidate> Description::extractCandidates() {
@@ -194,7 +210,7 @@ string Description::generateSdp(string_view eol) const {
 
 	// Header
 	sdp << "v=0" << eol;
-	sdp << "o=- " << mSessionId << " 0 IN IP4 127.0.0.1" << eol;
+	sdp << "o=" << mUsername << " " << mSessionId << " 0 IN IP4 127.0.0.1" << eol;
 	sdp << "s=-" << eol;
 	sdp << "t=0 0" << eol;
 
@@ -217,20 +233,29 @@ string Description::generateSdp(string_view eol) const {
 
 	// Session-level attributes
 	sdp << "a=msid-semantic:WMS *" << eol;
-	sdp << "a=setup:" << roleToString(mRole) << eol;
-	sdp << "a=ice-ufrag:" << mIceUfrag << eol;
-	sdp << "a=ice-pwd:" << mIcePwd << eol;
+	sdp << "a=setup:" << mRole << eol;
 
+	if (mIceUfrag)
+		sdp << "a=ice-ufrag:" << *mIceUfrag << eol;
+	if (mIcePwd)
+		sdp << "a=ice-pwd:" << *mIcePwd << eol;
 	if (!mEnded)
 		sdp << "a=ice-options:trickle" << eol;
-
 	if (mFingerprint)
 		sdp << "a=fingerprint:sha-256 " << *mFingerprint << eol;
 
+	auto cand = defaultCandidate();
+	const string addr = cand && cand->isResolved()
+	                        ? (string(cand->family() == Candidate::Family::Ipv6 ? "IP6" : "IP4") +
+	                           " " + *cand->address())
+	                        : "IP4 0.0.0.0";
+	const string port = std::to_string(
+	    cand && cand->isResolved() ? *cand->port() : 9); // Port 9 is the discard protocol
+
 	// Entries
 	bool first = true;
 	for (const auto &entry : mEntries) {
-		sdp << entry->generateSdp(eol);
+		sdp << entry->generateSdp(eol, addr, port);
 
 		if (std::exchange(first, false)) {
 			// Candidates
@@ -250,23 +275,32 @@ string Description::generateApplicationSdp(string_view eol) const {
 
 	// Header
 	sdp << "v=0" << eol;
-	sdp << "o=- " << mSessionId << " 0 IN IP4 127.0.0.1" << eol;
+	sdp << "o=" << mUsername << " " << mSessionId << " 0 IN IP4 127.0.0.1" << eol;
 	sdp << "s=-" << eol;
 	sdp << "t=0 0" << eol;
 
+	auto cand = defaultCandidate();
+	const string addr = cand && cand->isResolved()
+	                        ? (string(cand->family() == Candidate::Family::Ipv6 ? "IP6" : "IP4") +
+	                           " " + *cand->address())
+	                        : "IP4 0.0.0.0";
+	const string port = std::to_string(
+	    cand && cand->isResolved() ? *cand->port() : 9); // Port 9 is the discard protocol
+
 	// Application
 	auto app = mApplication ? mApplication : std::make_shared<Application>();
-	sdp << app->generateSdp(eol);
+	sdp << app->generateSdp(eol, addr, port);
 
 	// Session-level attributes
 	sdp << "a=msid-semantic:WMS *" << eol;
-	sdp << "a=setup:" << roleToString(mRole) << eol;
-	sdp << "a=ice-ufrag:" << mIceUfrag << eol;
-	sdp << "a=ice-pwd:" << mIcePwd << eol;
+	sdp << "a=setup:" << mRole << eol;
 
+	if (mIceUfrag)
+		sdp << "a=ice-ufrag:" << *mIceUfrag << eol;
+	if (mIcePwd)
+		sdp << "a=ice-pwd:" << *mIcePwd << eol;
 	if (!mEnded)
 		sdp << "a=ice-options:trickle" << eol;
-
 	if (mFingerprint)
 		sdp << "a=fingerprint:sha-256 " << *mFingerprint << eol;
 
@@ -280,6 +314,21 @@ string Description::generateApplicationSdp(string_view eol) const {
 	return sdp.str();
 }
 
+std::optional<Candidate> Description::defaultCandidate() const {
+	// Return the first host candidate with highest priority, favoring IPv4
+	std::optional<Candidate> result;
+	for (const auto &c : mCandidates) {
+		if (c.type() == Candidate::Type::Host) {
+			if (!result ||
+			    (result->family() == Candidate::Family::Ipv6 &&
+			     c.family() == Candidate::Family::Ipv4) ||
+			    (result->family() == c.family() && result->priority() < c.priority()))
+				result.emplace(c);
+		}
+	}
+	return result;
+}
+
 shared_ptr<Description::Entry> Description::createEntry(string mline, string mid, Direction dir) {
 	string type = mline.substr(0, mline.find(' '));
 	if (type == "application") {
@@ -315,6 +364,14 @@ bool Description::hasAudioOrVideo() const {
 	return false;
 }
 
+bool Description::hasMid(string_view mid) const {
+	for (const auto &entry : mEntries)
+		if (entry->mid() == mid)
+			return true;
+
+	return false;
+}
+
 int Description::addMedia(Media media) {
 	mEntries.emplace_back(std::make_shared<Media>(std::move(media)));
 	return int(mEntries.size()) - 1;
@@ -339,8 +396,9 @@ int Description::addAudio(string mid, Direction dir) {
 	return addMedia(Audio(std::move(mid), dir));
 }
 
-std::variant<Description::Media *, Description::Application *> Description::media(int index) {
-	if (index < 0 || index >= int(mEntries.size()))
+std::variant<Description::Media *, Description::Application *>
+Description::media(unsigned int index) {
+	if (index >= mEntries.size())
 		throw std::out_of_range("Media index out of range");
 
 	const auto &entry = mEntries[index];
@@ -358,8 +416,8 @@ std::variant<Description::Media *, Description::Application *> Description::medi
 }
 
 std::variant<const Description::Media *, const Description::Application *>
-Description::media(int index) const {
-	if (index < 0 || index >= int(mEntries.size()))
+Description::media(unsigned int index) const {
+	if (index >= mEntries.size())
 		throw std::out_of_range("Media index out of range");
 
 	const auto &entry = mEntries[index];
@@ -376,7 +434,7 @@ Description::media(int index) const {
 	}
 }
 
-int Description::mediaCount() const { return int(mEntries.size()); }
+unsigned int Description::mediaCount() const { return unsigned(mEntries.size()); }
 
 Description::Entry::Entry(const string &mline, string mid, Direction dir)
     : mMid(std::move(mid)), mDirection(dir) {
@@ -390,13 +448,12 @@ Description::Entry::Entry(const string &mline, string mid, Direction dir)
 
 void Description::Entry::setDirection(Direction dir) { mDirection = dir; }
 
-Description::Entry::operator string() const { return generateSdp("\r\n"); }
+Description::Entry::operator string() const { return generateSdp("\r\n", "IP4 0.0.0.0", "9"); }
 
-string Description::Entry::generateSdp(string_view eol) const {
+string Description::Entry::generateSdp(string_view eol, string_view addr, string_view port) const {
 	std::ostringstream sdp;
-	// Port 9 is the discard protocol
-	sdp << "m=" << type() << ' ' << 9 << ' ' << description() << eol;
-	sdp << "c=IN IP4 0.0.0.0" << eol;
+	sdp << "m=" << type() << ' ' << port << ' ' << description() << eol;
+	sdp << "c=IN " << addr << eol;
 	sdp << generateSdpLines(eol);
 
 	return sdp.str();
@@ -425,8 +482,10 @@ string Description::Entry::generateSdpLines(string_view eol) const {
 		break;
 	}
 
-	for (const auto &attr : mAttributes)
-		sdp << "a=" << attr << eol;
+	for (const auto &attr : mAttributes) {
+		if (attr.find("extmap") == string::npos && attr.find("rtcp-rsize") == string::npos)
+			sdp << "a=" << attr << eol;
+	}
 
 	return sdp.str();
 }
@@ -452,6 +511,51 @@ void Description::Entry::parseSdpLine(string_view line) {
 			mAttributes.emplace_back(line.substr(2));
 	}
 }
+std::vector<string>::iterator Description::Entry::beginAttributes() { return mAttributes.begin(); }
+std::vector<string>::iterator Description::Entry::endAttributes() { return mAttributes.end(); }
+std::vector<string>::iterator
+Description::Entry::removeAttribute(std::vector<string>::iterator it) {
+	return mAttributes.erase(it);
+}
+
+void Description::Media::addSSRC(uint32_t ssrc, std::optional<string> name,
+                                 std::optional<string> msid) {
+	if (name)
+		mAttributes.emplace_back("ssrc:" + std::to_string(ssrc) + " cname:" + *name);
+	else
+		mAttributes.emplace_back("ssrc:" + std::to_string(ssrc));
+
+	if (msid)
+		mAttributes.emplace_back("ssrc:" + std::to_string(ssrc) + " msid:" + *msid + " " + *msid);
+
+	mSsrcs.emplace_back(ssrc);
+}
+
+void Description::Media::replaceSSRC(uint32_t oldSSRC, uint32_t ssrc, std::optional<string> name,
+                                     std::optional<string> msid) {
+	auto it = mAttributes.begin();
+	while (it != mAttributes.end()) {
+		if (it->find("ssrc:" + std::to_string(oldSSRC)) == 0) {
+			it = mAttributes.erase(it);
+		} else
+			it++;
+	}
+	addSSRC(ssrc, std::move(name), std::move(msid));
+}
+
+void Description::Media::removeSSRC(uint32_t oldSSRC) {
+	auto it = mAttributes.begin();
+	while (it != mAttributes.end()) {
+		if (it->find("ssrc:" + std::to_string(oldSSRC)) == 0) {
+			it = mAttributes.erase(it);
+		} else
+			it++;
+	}
+}
+
+bool Description::Media::hasSSRC(uint32_t ssrc) {
+	return std::find(mSsrcs.begin(), mSsrcs.end(), ssrc) != mSsrcs.end();
+}
 
 Description::Application::Application(string mid)
     : Entry("application 9 UDP/DTLS/SCTP", std::move(mid), Direction::SendRecv) {}
@@ -515,8 +619,7 @@ Description::Media::Media(const string &sdp) : Entry(sdp, "", Direction::Unknown
 }
 
 Description::Media::Media(const string &mline, string mid, Direction dir)
-    : Entry(mline, std::move(mid), dir) {
-}
+    : Entry(mline, std::move(mid), dir) {}
 
 string Description::Media::description() const {
 	std::ostringstream desc;
@@ -600,24 +703,52 @@ void Description::Media::removeFormat(const string &fmt) {
 	}
 }
 
-void Description::Media::addVideoCodec(int payloadType, const string &codec) {
+void Description::Video::addVideoCodec(int payloadType, string codec,
+                                       std::optional<string> profile) {
 	RTPMap map(std::to_string(payloadType) + ' ' + codec + "/90000");
 	map.addFB("nack");
+	map.addFB("nack pli");
+	//    map.addFB("ccm fir");
 	map.addFB("goog-remb");
-	if (codec == "H264") {
-		// Use Constrained Baseline profile Level 4.2 (necessary for Firefox)
-		// https://developer.mozilla.org/en-US/docs/Web/Media/Formats/WebRTC_codecs#Supported_video_codecs
-		// TODO: Should be 42E0 but 42C0 appears to be more compatible. Investigate this.
-		map.fmtps.emplace_back("profile-level-id=42E02A;level-asymmetry-allowed=1");
-	}
-	mRtpMap.emplace(map.pt, map);
+	if (profile)
+		map.fmtps.emplace_back(*profile);
+	addRTPMap(map);
+
+	/* TODO
+	 *  TIL that Firefox does not properly support the negotiation of RTX! It works, but doesn't
+	 * negotiate the SSRC so we have no idea what SSRC is RTX going to be. Three solutions: One) we
+	 * don't negotitate it and (maybe) break RTX support with Edge. Two) we do negotiate it and
+	 * rebuild the original packet before we send it distribute it to each track. Three) we complain
+	 * to mozilla. This one probably won't do much.
+	 */
+	// RTX Packets
+	// RTPMap rtx(std::to_string(payloadType+1) + " rtx/90000");
+	// // TODO rtx-time is how long can a request be stashed for before needing to resend it.
+	// Needs to be parameterized rtx.addAttribute("apt=" + std::to_string(payloadType) +
+	// ";rtx-time=3000"); addRTPMap(rtx);
 }
 
-void Description::Media::addH264Codec(int pt) { addVideoCodec(pt, "H264"); }
+void Description::Audio::addAudioCodec(int payloadType, string codec,
+                                       std::optional<string> profile) {
+	// TODO This 48000/2 should be parameterized
+	RTPMap map(std::to_string(payloadType) + ' ' + codec + "/48000/2");
+	if (profile)
+		map.fmtps.emplace_back(*profile);
+	addRTPMap(map);
+}
 
-void Description::Media::addVP8Codec(int payloadType) { addVideoCodec(payloadType, "VP8"); }
+void Description::Media::addRTXCodec(unsigned int payloadType, unsigned int originalPayloadType,
+                                     unsigned int clockRate) {
+	RTPMap map(std::to_string(payloadType) + " RTX/" + std::to_string(clockRate));
+	map.fmtps.emplace_back("apt=" + std::to_string(originalPayloadType));
+	addRTPMap(map);
+}
 
-void Description::Media::addVP9Codec(int payloadType) { addVideoCodec(payloadType, "VP9"); }
+void Description::Video::addH264Codec(int pt) { addVideoCodec(pt, "H264"); }
+
+void Description::Video::addVP8Codec(int payloadType) { addVideoCodec(payloadType, "VP8", nullopt); }
+
+void Description::Video::addVP9Codec(int payloadType) { addVideoCodec(payloadType, "VP9", nullopt); }
 
 void Description::Media::setBitrate(int bitrate) { mBas = bitrate; }
 
@@ -644,8 +775,10 @@ string Description::Media::generateSdpLines(string_view eol) const {
 			sdp << '/' << map.encParams;
 		sdp << eol;
 
-		for (const auto &val : map.rtcpFbs)
-			sdp << "a=rtcp-fb:" << map.pt << ' ' << val << eol;
+		for (const auto &val : map.rtcpFbs) {
+			if (val != "transport-cc")
+				sdp << "a=rtcp-fb:" << map.pt << ' ' << val << eol;
+		}
 		for (const auto &val : map.fmtps)
 			sdp << "a=fmtp:" << map.pt << ' ' << val << eol;
 	}
@@ -659,29 +792,32 @@ void Description::Media::parseSdpLine(string_view line) {
 		auto [key, value] = parse_pair(attr);
 
 		if (key == "rtpmap") {
-			Description::Media::RTPMap map(value);
-			int pt = map.pt;
-			mRtpMap.emplace(pt, std::move(map));
+			auto pt = Description::Media::RTPMap::parsePT(value);
+			auto it = mRtpMap.find(pt);
+			if (it == mRtpMap.end()) {
+				it = mRtpMap.insert(std::make_pair(pt, Description::Media::RTPMap(value))).first;
+			} else {
+				it->second.setMLine(value);
+			}
 		} else if (key == "rtcp-fb") {
 			size_t p = value.find(' ');
 			int pt = to_integer<int>(value.substr(0, p));
 			auto it = mRtpMap.find(pt);
 			if (it == mRtpMap.end()) {
-				PLOG_WARNING << "rtcp-fb applied before the corresponding rtpmap, ignoring";
-			} else {
-				it->second.rtcpFbs.emplace_back(value.substr(p + 1));
+				it = mRtpMap.insert(std::make_pair(pt, Description::Media::RTPMap())).first;
 			}
+			it->second.rtcpFbs.emplace_back(value.substr(p + 1));
 		} else if (key == "fmtp") {
 			size_t p = value.find(' ');
 			int pt = to_integer<int>(value.substr(0, p));
 			auto it = mRtpMap.find(pt);
-			if (it == mRtpMap.end()) {
-				PLOG_WARNING << "fmtp applied before the corresponding rtpmap, ignoring";
-			} else {
-				it->second.fmtps.emplace_back(value.substr(p + 1));
-			}
+			if (it == mRtpMap.end())
+				it = mRtpMap.insert(std::make_pair(pt, Description::Media::RTPMap())).first;
+			it->second.fmtps.emplace_back(value.substr(p + 1));
 		} else if (key == "rtcp-mux") {
 			// always added
+		} else if (key == "ssrc") {
+			mSsrcs.emplace_back(std::stoul(string(value)));
 		} else {
 			Entry::parseSdpLine(line);
 		}
@@ -692,7 +828,55 @@ void Description::Media::parseSdpLine(string_view line) {
 	}
 }
 
-Description::Media::RTPMap::RTPMap(string_view mline) {
+void Description::Media::addRTPMap(const Description::Media::RTPMap &map) {
+	mRtpMap.emplace(map.pt, map);
+}
+
+std::vector<uint32_t> Description::Media::getSSRCs() {
+	std::vector<uint32_t> vec;
+	for (auto &val : mAttributes) {
+		PLOG_DEBUG << val;
+		if (val.find("ssrc:") == 0) {
+			vec.emplace_back(std::stoul(string(val.substr(5, val.find(" ")))));
+		}
+	}
+	return vec;
+}
+
+std::map<int, Description::Media::RTPMap>::iterator Description::Media::beginMaps() {
+	return mRtpMap.begin();
+}
+
+std::map<int, Description::Media::RTPMap>::iterator Description::Media::endMaps() {
+	return mRtpMap.end();
+}
+
+std::map<int, Description::Media::RTPMap>::iterator
+Description::Media::removeMap(std::map<int, Description::Media::RTPMap>::iterator iterator) {
+	return mRtpMap.erase(iterator);
+}
+
+Description::Media::RTPMap::RTPMap(string_view mline) { setMLine(mline); }
+
+void Description::Media::RTPMap::removeFB(const string &str) {
+	auto it = rtcpFbs.begin();
+	while (it != rtcpFbs.end()) {
+		if (it->find(str) != string::npos) {
+			it = rtcpFbs.erase(it);
+		} else
+			it++;
+	}
+}
+
+void Description::Media::RTPMap::addFB(const string &str) { rtcpFbs.emplace_back(str); }
+
+int Description::Media::RTPMap::parsePT(string_view view) {
+	size_t p = view.find(' ');
+
+	return to_integer<int>(view.substr(0, p));
+}
+
+void Description::Media::RTPMap::setMLine(string_view mline) {
 	size_t p = mline.find(' ');
 
 	this->pt = to_integer<int>(mline.substr(0, p));
@@ -710,56 +894,43 @@ Description::Media::RTPMap::RTPMap(string_view mline) {
 		this->clockRate = to_integer<int>(line);
 	else {
 		this->clockRate = to_integer<int>(line.substr(0, spl));
-		this->encParams = line.substr(spl);
+		this->encParams = line.substr(spl + 1);
 	}
 }
 
-void Description::Media::RTPMap::removeFB(const string &str) {
-	auto it = rtcpFbs.begin();
-	while (it != rtcpFbs.end()) {
-		if (it->find(str) != std::string::npos) {
-			it = rtcpFbs.erase(it);
-		} else
-			it++;
-	}
-}
-
-void Description::Media::RTPMap::addFB(const string &str) { rtcpFbs.emplace_back(str); }
-
 Description::Audio::Audio(string mid, Direction dir)
     : Media("audio 9 UDP/TLS/RTP/SAVPF", std::move(mid), dir) {}
 
+void Description::Audio::addOpusCodec(int payloadType) { addAudioCodec(payloadType, "OPUS"); }
+
 Description::Video::Video(string mid, Direction dir)
     : Media("video 9 UDP/TLS/RTP/SAVPF", std::move(mid), dir) {}
 
 Description::Type Description::stringToType(const string &typeString) {
-	if (typeString == "offer")
-		return Type::Offer;
-	else if (typeString == "answer")
-		return Type::Answer;
-	else
-		return Type::Unspec;
+	using TypeMap_t = std::unordered_map<string, Type>;
+	static const TypeMap_t TypeMap = {{"unspec", Type::Unspec},
+	                                  {"offer", Type::Offer},
+	                                  {"answer", Type::Answer},
+	                                  {"pranswer", Type::Pranswer},
+	                                  {"rollback", Type::Rollback}};
+	auto it = TypeMap.find(typeString);
+	return it != TypeMap.end() ? it->second : Type::Unspec;
 }
 
 string Description::typeToString(Type type) {
 	switch (type) {
+	case Type::Unspec:
+		return "unspec";
 	case Type::Offer:
 		return "offer";
 	case Type::Answer:
 		return "answer";
+	case Type::Pranswer:
+		return "pranswer";
+	case Type::Rollback:
+		return "rollback";
 	default:
-		return "";
-	}
-}
-
-string Description::roleToString(Role role) {
-	switch (role) {
-	case Role::Active:
-		return "active";
-	case Role::Passive:
-		return "passive";
-	default:
-		return "actpass";
+		return "unknown";
 	}
 }
 
@@ -768,3 +939,25 @@ string Description::roleToString(Role role) {
 std::ostream &operator<<(std::ostream &out, const rtc::Description &description) {
 	return out << std::string(description);
 }
+
+std::ostream &operator<<(std::ostream &out, rtc::Description::Type type) {
+	return out << rtc::Description::typeToString(type);
+}
+
+std::ostream &operator<<(std::ostream &out, rtc::Description::Role role) {
+	using Role = rtc::Description::Role;
+	const char *str;
+	// Used for SDP generation, do not change
+	switch (role) {
+	case Role::Active:
+		str = "active";
+		break;
+	case Role::Passive:
+		str = "passive";
+		break;
+	default:
+		str = "actpass";
+		break;
+	}
+	return out << str;
+}

src/dtlssrtptransport.cpp

@@ -82,7 +82,7 @@ bool DtlsSrtpTransport::sendMedia(message_ptr message) {
 		return false;
 	}
 
-	int size = message->size();
+	int size = int(message->size());
 	PLOG_VERBOSE << "Send size=" << size;
 
 	// The RTP header has a minimum size of 12 bytes
@@ -109,16 +109,31 @@ bool DtlsSrtpTransport::sendMedia(message_ptr message) {
 		if (srtp_err_status_t err = srtp_protect_rtcp(mSrtpOut, message->data(), &size)) {
 			if (err == srtp_err_status_replay_fail)
 				throw std::runtime_error("SRTCP packet is a replay");
-			else
+			else if (err == srtp_err_status_no_ctx) {
+				auto ssrc = reinterpret_cast<RTCP_SR *>(message->data())->senderSSRC();
+				PLOG_INFO << "Adding SSRC to SRTCP: " << ssrc;
+				addSSRC(ssrc);
+				if ((err = srtp_protect_rtcp(mSrtpOut, message->data(), &size)))
+					throw std::runtime_error("SRTCP protect error, status=" +
+					                         to_string(static_cast<int>(err)));
+			} else {
 				throw std::runtime_error("SRTCP protect error, status=" +
 				                         to_string(static_cast<int>(err)));
+			}
 		}
 		PLOG_VERBOSE << "Protected SRTCP packet, size=" << size;
 	} else {
 		if (srtp_err_status_t err = srtp_protect(mSrtpOut, message->data(), &size)) {
 			if (err == srtp_err_status_replay_fail)
-				throw std::runtime_error("SRTP packet is a replay");
-			else
+				throw std::runtime_error("Outgoing SRTP packet is a replay");
+			else if (err == srtp_err_status_no_ctx) {
+				auto ssrc = reinterpret_cast<RTP *>(message->data())->ssrc();
+				PLOG_INFO << "Adding SSRC to RTP: " << ssrc;
+				addSSRC(ssrc);
+				if ((err = srtp_protect(mSrtpOut, message->data(), &size)))
+					throw std::runtime_error("SRTP protect error, status=" +
+					                         to_string(static_cast<int>(err)));
+			} else
 				throw std::runtime_error("SRTP protect error, status=" +
 				                         to_string(static_cast<int>(err)));
 		}
@@ -126,8 +141,14 @@ bool DtlsSrtpTransport::sendMedia(message_ptr message) {
 	}
 
 	message->resize(size);
-	return outgoing(message);
-//	return DtlsTransport::send(message);
+
+	if (message->dscp == 0) { // Track might override the value
+		// Set recommended medium-priority DSCP value
+		// See https://tools.ietf.org/html/draft-ietf-tsvwg-rtcweb-qos-18
+		message->dscp = 36; // AF42: Assured Forwarding class 4, medium drop probability
+	}
+
+	return Transport::outgoing(message); // bypass DTLS DSCP marking
 }
 
 void DtlsSrtpTransport::incoming(message_ptr message) {
@@ -137,7 +158,7 @@ void DtlsSrtpTransport::incoming(message_ptr message) {
 		return;
 	}
 
-	int size = message->size();
+	int size = int(message->size());
 	if (size == 0)
 		return;
 
@@ -174,13 +195,22 @@ void DtlsSrtpTransport::incoming(message_ptr message) {
 					PLOG_WARNING << "Incoming SRTCP packet is a replay";
 				else if (err == srtp_err_status_auth_fail)
 					PLOG_WARNING << "Incoming SRTCP packet failed authentication check";
-				else
-					PLOG_WARNING << "SRTCP unprotect error, status=" << err;
+				else if (err == srtp_err_status_no_ctx) {
+					auto ssrc = reinterpret_cast<RTCP_SR *>(message->data())->senderSSRC();
+					PLOG_INFO << "Adding SSRC to RTCP: " << ssrc;
+					addSSRC(ssrc);
+					if ((err = srtp_unprotect_rtcp(mSrtpIn, message->data(), &size)))
+						throw std::runtime_error("SRTCP unprotect error, status=" +
+						                         to_string(static_cast<int>(err)));
+				} else {
+					PLOG_WARNING << "SRTCP unprotect error, status=" << err
+					             << " SSRC=" << ((RTCP_SR *)message->data())->senderSSRC();
+				}
 				return;
 			}
 			PLOG_VERBOSE << "Unprotected SRTCP packet, size=" << size;
 			message->type = Message::Type::Control;
-			message->stream = to_integer<uint8_t>(*(message->begin() + 1)); // Payload Type
+			message->stream = reinterpret_cast<RTCP_SR *>(message->data())->senderSSRC();
 		} else {
 			PLOG_VERBOSE << "Incoming SRTP packet, size=" << size;
 			if (srtp_err_status_t err = srtp_unprotect(mSrtpIn, message->data(), &size)) {
@@ -188,13 +218,21 @@ void DtlsSrtpTransport::incoming(message_ptr message) {
 					PLOG_WARNING << "Incoming SRTP packet is a replay";
 				else if (err == srtp_err_status_auth_fail)
 					PLOG_WARNING << "Incoming SRTP packet failed authentication check";
-				else
-					PLOG_WARNING << "SRTP unprotect error, status=" << err;
+				else if (err == srtp_err_status_no_ctx) {
+					auto ssrc = reinterpret_cast<RTP *>(message->data())->ssrc();
+					PLOG_INFO << "Adding SSRC to RTP: " << ssrc;
+					addSSRC(ssrc);
+					if ((err = srtp_unprotect(mSrtpIn, message->data(), &size)))
+						throw std::runtime_error("SRTP unprotect error, status=" +
+						                         to_string(static_cast<int>(err)));
+				} else
+					PLOG_WARNING << "SRTP unprotect error, status=" << err
+					             << " SSRC=" << reinterpret_cast<RTP *>(message->data())->ssrc();
 				return;
 			}
 			PLOG_VERBOSE << "Unprotected SRTP packet, size=" << size;
 			message->type = Message::Type::Binary;
-			message->stream = value2; // Payload Type
+			message->stream = reinterpret_cast<RTP *>(message->data())->ssrc();
 		}
 
 		message->resize(size);
@@ -209,6 +247,8 @@ void DtlsSrtpTransport::postHandshake() {
 	if (mInitDone)
 		return;
 
+	static_assert(SRTP_AES_ICM_128_KEY_LEN_WSALT == SRTP_AES_128_KEY_LEN + SRTP_SALT_LEN);
+
 	const size_t materialLen = SRTP_AES_ICM_128_KEY_LEN_WSALT * 2;
 	unsigned char material[materialLen];
 	const unsigned char *clientKey, *clientSalt, *serverKey, *serverSalt;
@@ -257,21 +297,41 @@ void DtlsSrtpTransport::postHandshake() {
 	serverSalt = clientSalt + SRTP_SALT_LEN;
 #endif
 
-	unsigned char clientSessionKey[SRTP_AES_ICM_128_KEY_LEN_WSALT];
-	std::memcpy(clientSessionKey, clientKey, SRTP_AES_128_KEY_LEN);
-	std::memcpy(clientSessionKey + SRTP_AES_128_KEY_LEN, clientSalt, SRTP_SALT_LEN);
+	std::memcpy(mClientSessionKey, clientKey, SRTP_AES_128_KEY_LEN);
+	std::memcpy(mClientSessionKey + SRTP_AES_128_KEY_LEN, clientSalt, SRTP_SALT_LEN);
 
-	unsigned char serverSessionKey[SRTP_AES_ICM_128_KEY_LEN_WSALT];
-	std::memcpy(serverSessionKey, serverKey, SRTP_AES_128_KEY_LEN);
-	std::memcpy(serverSessionKey + SRTP_AES_128_KEY_LEN, serverSalt, SRTP_SALT_LEN);
+	std::memcpy(mServerSessionKey, serverKey, SRTP_AES_128_KEY_LEN);
+	std::memcpy(mServerSessionKey + SRTP_AES_128_KEY_LEN, serverSalt, SRTP_SALT_LEN);
+
+	// Add SSRC=1 as an inbound because that is what Chrome does.
+	srtp_policy_t inbound = {};
+	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&inbound.rtp);
+	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&inbound.rtcp);
+	inbound.ssrc.type = ssrc_specific;
+	inbound.ssrc.value = 1;
+	inbound.key = mIsClient ? mServerSessionKey : mClientSessionKey;
+	inbound.next = nullptr;
+
+	if (srtp_err_status_t err = srtp_add_stream(mSrtpIn, &inbound)) {
+		throw std::runtime_error("SRTP add inbound stream failed, status=" +
+		                         to_string(static_cast<int>(err)));
+	}
+
+	mInitDone = true;
+}
+
+void DtlsSrtpTransport::addSSRC(uint32_t ssrc) {
+	if (!mInitDone)
+		throw std::logic_error("Attempted to add SSRC before SRTP keying material is derived");
 
 	srtp_policy_t inbound = {};
 	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&inbound.rtp);
 	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&inbound.rtcp);
-	inbound.ssrc.type = ssrc_any_inbound;
-	inbound.ssrc.value = 0;
-	inbound.key = mIsClient ? serverSessionKey : clientSessionKey;
+	inbound.ssrc.type = ssrc_specific;
+	inbound.ssrc.value = ssrc;
+	inbound.key = mIsClient ? mServerSessionKey : mClientSessionKey;
 	inbound.next = nullptr;
+	inbound.allow_repeat_tx = true;
 
 	if (srtp_err_status_t err = srtp_add_stream(mSrtpIn, &inbound))
 		throw std::runtime_error("SRTP add inbound stream failed, status=" +
@@ -280,16 +340,15 @@ void DtlsSrtpTransport::postHandshake() {
 	srtp_policy_t outbound = {};
 	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&outbound.rtp);
 	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&outbound.rtcp);
-	outbound.ssrc.type = ssrc_any_outbound;
-	outbound.ssrc.value = 0;
-	outbound.key = mIsClient ? clientSessionKey : serverSessionKey;
+	outbound.ssrc.type = ssrc_specific;
+	outbound.ssrc.value = ssrc;
+	outbound.key = mIsClient ? mClientSessionKey : mServerSessionKey;
 	outbound.next = nullptr;
+	outbound.allow_repeat_tx = true;
 
 	if (srtp_err_status_t err = srtp_add_stream(mSrtpOut, &outbound))
 		throw std::runtime_error("SRTP add outbound stream failed, status=" +
 		                         to_string(static_cast<int>(err)));
-
-	mInitDone = true;
 }
 
 } // namespace rtc

src/dtlssrtptransport.hpp

@@ -24,7 +24,13 @@
 
 #if RTC_ENABLE_MEDIA
 
+#if RTC_SYSTEM_SRTP
 #include <srtp2/srtp.h>
+#else
+#include "srtp.h"
+#endif
+
+#include <atomic>
 
 namespace rtc {
 
@@ -39,6 +45,7 @@ public:
 	~DtlsSrtpTransport();
 
 	bool sendMedia(message_ptr message);
+	void addSSRC(uint32_t ssrc);
 
 private:
 	void incoming(message_ptr message) override;
@@ -47,7 +54,10 @@ private:
 	message_callback mSrtpRecvCallback;
 
 	srtp_t mSrtpIn, mSrtpOut;
-	bool mInitDone = false;
+
+	std::atomic<bool> mInitDone = false;
+	unsigned char mClientSessionKey[SRTP_AES_ICM_128_KEY_LEN_WSALT];
+	unsigned char mServerSessionKey[SRTP_AES_ICM_128_KEY_LEN_WSALT];
 };
 
 } // namespace rtc

src/dtlstransport.cpp

@@ -53,7 +53,7 @@ DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, certificate_ptr cer
                              verifier_callback verifierCallback, state_callback stateChangeCallback)
     : Transport(lower, std::move(stateChangeCallback)), mCertificate(certificate),
       mVerifierCallback(std::move(verifierCallback)),
-      mIsClient(lower->role() == Description::Role::Active) {
+      mIsClient(lower->role() == Description::Role::Active), mCurrentDscp(0) {
 
 	PLOG_DEBUG << "Initializing DTLS transport (GnuTLS)";
 
@@ -122,6 +122,7 @@ bool DtlsTransport::send(message_ptr message) {
 
 	PLOG_VERBOSE << "Send size=" << message->size();
 
+	mCurrentDscp = message->dscp;
 	ssize_t ret;
 	do {
 		ret = gnutls_record_send(mSession, message->data(), message->size());
@@ -143,6 +144,13 @@ void DtlsTransport::incoming(message_ptr message) {
 	mIncomingQueue.push(message);
 }
 
+bool DtlsTransport::outgoing(message_ptr message) {
+	if (message->dscp == 0)
+		message->dscp = mCurrentDscp;
+
+	return Transport::outgoing(std::move(message));
+}
+
 void DtlsTransport::postHandshake() {
 	// Dummy
 }
@@ -177,8 +185,8 @@ void DtlsTransport::runRecvLoop() {
 	// Receive loop
 	try {
 		PLOG_INFO << "DTLS handshake finished";
-		changeState(State::Connected);
 		postHandshake();
+		changeState(State::Connected);
 
 		const size_t bufferSize = maxMtu;
 		char buffer[bufferSize];
@@ -309,7 +317,7 @@ DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, shared_ptr<Certific
                              verifier_callback verifierCallback, state_callback stateChangeCallback)
     : Transport(lower, std::move(stateChangeCallback)), mCertificate(certificate),
       mVerifierCallback(std::move(verifierCallback)),
-      mIsClient(lower->role() == Description::Role::Active) {
+      mIsClient(lower->role() == Description::Role::Active), mCurrentDscp(0) {
 	PLOG_DEBUG << "Initializing DTLS transport (OpenSSL)";
 
 	try {
@@ -405,6 +413,7 @@ bool DtlsTransport::send(message_ptr message) {
 
 	PLOG_VERBOSE << "Send size=" << message->size();
 
+	mCurrentDscp = message->dscp;
 	int ret = SSL_write(mSsl, message->data(), int(message->size()));
 	return openssl::check(mSsl, ret);
 }
@@ -419,6 +428,13 @@ void DtlsTransport::incoming(message_ptr message) {
 	mIncomingQueue.push(message);
 }
 
+bool DtlsTransport::outgoing(message_ptr message) {
+	if (message->dscp == 0)
+		message->dscp = mCurrentDscp;
+
+	return Transport::outgoing(std::move(message));
+}
+
 void DtlsTransport::postHandshake() {
 	// Dummy
 }
@@ -453,8 +469,8 @@ void DtlsTransport::runRecvLoop() {
 						SSL_set_mtu(mSsl, maxMtu + 1);
 
 						PLOG_INFO << "DTLS handshake finished";
-						changeState(State::Connected);
 						postHandshake();
+						changeState(State::Connected);
 					}
 				} else {
 					ret = SSL_read(mSsl, buffer, bufferSize);
@@ -575,4 +591,3 @@ long DtlsTransport::BioMethodCtrl(BIO * /*bio*/, int cmd, long /*num*/, void * /
 #endif
 
 } // namespace rtc
-

src/dtlstransport.hpp

@@ -53,6 +53,7 @@ public:
 
 protected:
 	virtual void incoming(message_ptr message) override;
+	virtual bool outgoing(message_ptr message) override;
 	virtual void postHandshake();
 	void runRecvLoop();
 
@@ -62,6 +63,7 @@ protected:
 
 	Queue<message_ptr> mIncomingQueue;
 	std::thread mRecvThread;
+	std::atomic<unsigned int> mCurrentDscp;
 
 #if USE_GNUTLS
 	gnutls_session_t mSession;
@@ -92,4 +94,3 @@ protected:
 } // namespace rtc
 
 #endif
-

src/icetransport.cpp

@@ -46,11 +46,12 @@ using std::chrono::system_clock;
 
 namespace rtc {
 
-IceTransport::IceTransport(const Configuration &config, Description::Role role,
-                           candidate_callback candidateCallback, state_callback stateChangeCallback,
+IceTransport::IceTransport(const Configuration &config, candidate_callback candidateCallback,
+                           state_callback stateChangeCallback,
                            gathering_state_callback gatheringStateChangeCallback)
-    : Transport(nullptr, std::move(stateChangeCallback)), mRole(role), mMid("0"),
-      mGatheringState(GatheringState::New), mCandidateCallback(std::move(candidateCallback)),
+    : Transport(nullptr, std::move(stateChangeCallback)), mRole(Description::Role::ActPass),
+      mMid("0"), mGatheringState(GatheringState::New),
+      mCandidateCallback(std::move(candidateCallback)),
       mGatheringStateChangeCallback(std::move(gatheringStateChangeCallback)),
       mAgent(nullptr, nullptr) {
 
@@ -60,7 +61,8 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 	}
 
 	juice_log_level_t level;
-	switch (plog::get()->getMaxSeverity()) {
+	auto logger = plog::get();
+	switch (logger ? logger->getMaxSeverity() : plog::none) {
 	case plog::none:
 		level = JUICE_LOG_LEVEL_NONE;
 		break;
@@ -129,9 +131,7 @@ IceTransport::~IceTransport() {
 	mAgent.reset();
 }
 
-bool IceTransport::stop() {
-	return Transport::stop();
-}
+bool IceTransport::stop() { return Transport::stop(); }
 
 Description::Role IceTransport::role() const { return mRole; }
 
@@ -140,12 +140,20 @@ Description IceTransport::getLocalDescription(Description::Type type) const {
 	if (juice_get_local_description(mAgent.get(), sdp, JUICE_MAX_SDP_STRING_LEN) < 0)
 		throw std::runtime_error("Failed to generate local SDP");
 
-	return Description(string(sdp), type, mRole);
+	// RFC 5763: The endpoint that is the offerer MUST use the setup attribute value of
+	// setup:actpass.
+	// See https://tools.ietf.org/html/rfc5763#section-5
+	return Description(string(sdp), type,
+	                   type == Description::Type::Offer ? Description::Role::ActPass : mRole);
 }
 
 void IceTransport::setRemoteDescription(const Description &description) {
-	mRole = description.role() == Description::Role::Active ? Description::Role::Passive
-	                                                        : Description::Role::Active;
+	if (mRole == Description::Role::ActPass)
+		mRole = description.role() == Description::Role::Active ? Description::Role::Passive
+		                                                        : Description::Role::Active;
+	if (mRole == description.role())
+		throw std::logic_error("Incompatible roles with remote description");
+
 	mMid = description.bundleMid();
 	if (juice_set_remote_description(mAgent.get(),
 	                                 description.generateApplicationSdp("\r\n").c_str()) < 0)
@@ -160,7 +168,9 @@ bool IceTransport::addRemoteCandidate(const Candidate &candidate) {
 	return juice_add_remote_candidate(mAgent.get(), string(candidate).c_str()) >= 0;
 }
 
-void IceTransport::gatherLocalCandidates() {
+void IceTransport::gatherLocalCandidates(string mid) {
+	mMid = std::move(mid);
+
 	// Change state now as candidates calls can be synchronous
 	changeGatheringState(GatheringState::InProgress);
 
@@ -186,6 +196,24 @@ std::optional<string> IceTransport::getRemoteAddress() const {
 	return nullopt;
 }
 
+bool IceTransport::getSelectedCandidatePair(Candidate *local, Candidate *remote) {
+	char sdpLocal[JUICE_MAX_CANDIDATE_SDP_STRING_LEN];
+	char sdpRemote[JUICE_MAX_CANDIDATE_SDP_STRING_LEN];
+	if (juice_get_selected_candidates(mAgent.get(), sdpLocal, JUICE_MAX_CANDIDATE_SDP_STRING_LEN,
+	                                  sdpRemote, JUICE_MAX_CANDIDATE_SDP_STRING_LEN) == 0) {
+		if (local) {
+			*local = Candidate(sdpLocal, mMid);
+			local->resolve(Candidate::ResolveMode::Simple);
+		}
+		if (remote) {
+			*remote = Candidate(sdpRemote, mMid);
+			remote->resolve(Candidate::ResolveMode::Simple);
+		}
+		return true;
+	}
+	return false;
+}
+
 bool IceTransport::send(message_ptr message) {
 	auto s = state();
 	if (!message || (s != State::Connected && s != State::Completed))
@@ -196,8 +224,10 @@ bool IceTransport::send(message_ptr message) {
 }
 
 bool IceTransport::outgoing(message_ptr message) {
-	return juice_send(mAgent.get(), reinterpret_cast<const char *>(message->data()),
-	                  message->size()) >= 0;
+	// Explicit Congestion Notification takes the least-significant 2 bits of the DS field
+	int ds = int(message->dscp << 2);
+	return juice_send_diffserv(mAgent.get(), reinterpret_cast<const char *>(message->data()),
+	                           message->size(), ds) >= 0;
 }
 
 void IceTransport::changeGatheringState(GatheringState state) {
@@ -297,13 +327,14 @@ void IceTransport::LogCallback(juice_log_level_t level, const char *message) {
 
 namespace rtc {
 
-IceTransport::IceTransport(const Configuration &config, Description::Role role,
-                           candidate_callback candidateCallback, state_callback stateChangeCallback,
+IceTransport::IceTransport(const Configuration &config, candidate_callback candidateCallback,
+                           state_callback stateChangeCallback,
                            gathering_state_callback gatheringStateChangeCallback)
-    : Transport(nullptr, std::move(stateChangeCallback)), mRole(role), mMid("0"),
-      mGatheringState(GatheringState::New), mCandidateCallback(std::move(candidateCallback)),
+    : Transport(nullptr, std::move(stateChangeCallback)), mRole(Description::Role::ActPass),
+      mMid("0"), mGatheringState(GatheringState::New),
+      mCandidateCallback(std::move(candidateCallback)),
       mGatheringStateChangeCallback(std::move(gatheringStateChangeCallback)),
-      mNiceAgent(nullptr, nullptr), mMainLoop(nullptr, nullptr) {
+      mNiceAgent(nullptr, nullptr), mMainLoop(nullptr, nullptr), mOutgoingDscp(0) {
 
 	PLOG_DEBUG << "Initializing ICE transport (libnice)";
 
@@ -507,12 +538,21 @@ Description IceTransport::getLocalDescription(Description::Type type) const {
 
 	std::unique_ptr<gchar[], void (*)(void *)> sdp(nice_agent_generate_local_sdp(mNiceAgent.get()),
 	                                               g_free);
-	return Description(string(sdp.get()), type, mRole);
+
+	// RFC 5763: The endpoint that is the offerer MUST use the setup attribute value of
+	// setup:actpass.
+	// See https://tools.ietf.org/html/rfc5763#section-5
+	return Description(string(sdp.get()), type,
+	                   type == Description::Type::Offer ? Description::Role::ActPass : mRole);
 }
 
 void IceTransport::setRemoteDescription(const Description &description) {
-	mRole = description.role() == Description::Role::Active ? Description::Role::Passive
-	                                                        : Description::Role::Active;
+	if (mRole == Description::Role::ActPass)
+		mRole = description.role() == Description::Role::Active ? Description::Role::Passive
+		                                                        : Description::Role::Active;
+	if (mRole == description.role())
+		throw std::logic_error("Incompatible roles with remote description");
+
 	mMid = description.bundleMid();
 	mTrickleTimeout = !description.ended() ? 30s : 0s;
 
@@ -528,12 +568,14 @@ bool IceTransport::addRemoteCandidate(const Candidate &candidate) {
 		return false;
 
 	// Warning: the candidate string must start with "a=candidate:" and it must not end with a
-	// newline, else libnice will reject it.
+	// newline or whitespace, else libnice will reject it.
 	string sdp(candidate);
 	NiceCandidate *cand =
 	    nice_agent_parse_remote_candidate_sdp(mNiceAgent.get(), mStreamId, sdp.c_str());
-	if (!cand)
+	if (!cand) {
+		PLOG_WARNING << "Rejected ICE candidate: " << sdp;
 		return false;
+	}
 
 	GSList *list = g_slist_append(nullptr, cand);
 	int ret = nice_agent_set_remote_candidates(mNiceAgent.get(), mStreamId, 1, list);
@@ -542,7 +584,9 @@ bool IceTransport::addRemoteCandidate(const Candidate &candidate) {
 	return ret > 0;
 }
 
-void IceTransport::gatherLocalCandidates() {
+void IceTransport::gatherLocalCandidates(string mid) {
+	mMid = std::move(mid);
+
 	// Change state now as candidates calls can be synchronous
 	changeGatheringState(GatheringState::InProgress);
 
@@ -579,6 +623,13 @@ bool IceTransport::send(message_ptr message) {
 }
 
 bool IceTransport::outgoing(message_ptr message) {
+	std::lock_guard lock(mOutgoingMutex);
+	if (mOutgoingDscp != message->dscp) {
+		mOutgoingDscp = message->dscp;
+		// Explicit Congestion Notification takes the least-significant 2 bits of the DS field
+		int ds = int(message->dscp << 2);
+		nice_agent_set_stream_tos(mNiceAgent.get(), mStreamId, ds); // ToS is the legacy name for DS
+	}
 	return nice_agent_send(mNiceAgent.get(), mStreamId, 1, message->size(),
 	                       reinterpret_cast<const char *>(message->data())) >= 0;
 }
@@ -715,58 +766,28 @@ void IceTransport::LogCallback(const gchar * /*logDomain*/, GLogLevelFlags logLe
 	PLOG(severity) << "nice: " << message;
 }
 
-bool IceTransport::getSelectedCandidatePair(CandidateInfo *localInfo, CandidateInfo *remoteInfo) {
-	NiceCandidate *local, *remote;
-	gboolean result = nice_agent_get_selected_pair(mNiceAgent.get(), mStreamId, 1, &local, &remote);
-
-	if (!result)
+bool IceTransport::getSelectedCandidatePair(Candidate *local, Candidate *remote) {
+	NiceCandidate *niceLocal, *niceRemote;
+	if (!nice_agent_get_selected_pair(mNiceAgent.get(), mStreamId, 1, &niceLocal, &niceRemote))
 		return false;
 
-	char ipaddr[INET6_ADDRSTRLEN];
-	nice_address_to_string(&local->addr, ipaddr);
-	localInfo->address = std::string(ipaddr);
-	localInfo->port = nice_address_get_port(&local->addr);
-	localInfo->type = IceTransport::NiceTypeToCandidateType(local->type);
-	localInfo->transportType =
-	    IceTransport::NiceTransportTypeToCandidateTransportType(local->transport);
+	gchar *sdpLocal = nice_agent_generate_local_candidate_sdp(mNiceAgent.get(), niceLocal);
+	if (local)
+		*local = Candidate(sdpLocal, mMid);
+	g_free(sdpLocal);
 
-	nice_address_to_string(&remote->addr, ipaddr);
-	remoteInfo->address = std::string(ipaddr);
-	remoteInfo->port = nice_address_get_port(&remote->addr);
-	remoteInfo->type = IceTransport::NiceTypeToCandidateType(remote->type);
-	remoteInfo->transportType =
-	    IceTransport::NiceTransportTypeToCandidateTransportType(remote->transport);
+	gchar *sdpRemote = nice_agent_generate_local_candidate_sdp(mNiceAgent.get(), niceRemote);
+	if (remote)
+		*remote = Candidate(sdpRemote, mMid);
+	g_free(sdpRemote);
 
+	if (local)
+		local->resolve(Candidate::ResolveMode::Simple);
+	if (remote)
+		remote->resolve(Candidate::ResolveMode::Simple);
 	return true;
 }
 
-CandidateType IceTransport::NiceTypeToCandidateType(NiceCandidateType type) {
-	switch (type) {
-	case NiceCandidateType::NICE_CANDIDATE_TYPE_PEER_REFLEXIVE:
-		return CandidateType::PeerReflexive;
-	case NiceCandidateType::NICE_CANDIDATE_TYPE_RELAYED:
-		return CandidateType::Relayed;
-	case NiceCandidateType::NICE_CANDIDATE_TYPE_SERVER_REFLEXIVE:
-		return CandidateType::ServerReflexive;
-	default:
-		return CandidateType::Host;
-	}
-}
-
-CandidateTransportType
-IceTransport::NiceTransportTypeToCandidateTransportType(NiceCandidateTransport type) {
-	switch (type) {
-	case NiceCandidateTransport::NICE_CANDIDATE_TRANSPORT_TCP_ACTIVE:
-		return CandidateTransportType::TcpActive;
-	case NiceCandidateTransport::NICE_CANDIDATE_TRANSPORT_TCP_PASSIVE:
-		return CandidateTransportType::TcpPassive;
-	case NiceCandidateTransport::NICE_CANDIDATE_TRANSPORT_TCP_SO:
-		return CandidateTransportType::TcpSo;
-	default:
-		return CandidateTransportType::Udp;
-	}
-}
-
 } // namespace rtc
 
 #endif

src/icetransport.hpp

@@ -20,8 +20,8 @@
 #define RTC_ICE_TRANSPORT_H
 
 #include "candidate.hpp"
-#include "description.hpp"
 #include "configuration.hpp"
+#include "description.hpp"
 #include "include.hpp"
 #include "peerconnection.hpp"
 #include "transport.hpp"
@@ -35,6 +35,7 @@
 #include <atomic>
 #include <chrono>
 #include <thread>
+#include <mutex>
 
 namespace rtc {
 
@@ -45,8 +46,8 @@ public:
 	using candidate_callback = std::function<void(const Candidate &candidate)>;
 	using gathering_state_callback = std::function<void(GatheringState state)>;
 
-	IceTransport(const Configuration &config, Description::Role role,
-	             candidate_callback candidateCallback, state_callback stateChangeCallback,
+	IceTransport(const Configuration &config, candidate_callback candidateCallback,
+	             state_callback stateChangeCallback,
 	             gathering_state_callback gatheringStateChangeCallback);
 	~IceTransport();
 
@@ -55,7 +56,7 @@ public:
 	Description getLocalDescription(Description::Type type) const;
 	void setRemoteDescription(const Description &description);
 	bool addRemoteCandidate(const Candidate &candidate);
-	void gatherLocalCandidates();
+	void gatherLocalCandidates(string mid);
 
 	std::optional<string> getLocalAddress() const;
 	std::optional<string> getRemoteAddress() const;
@@ -63,9 +64,7 @@ public:
 	bool stop() override;
 	bool send(message_ptr message) override; // false if dropped
 
-#if USE_NICE
-	bool getSelectedCandidatePair(CandidateInfo *local, CandidateInfo *remote);
-#endif
+	bool getSelectedCandidatePair(Candidate *local, Candidate *remote);
 
 private:
 	bool outgoing(message_ptr message) override;
@@ -101,6 +100,8 @@ private:
 	std::unique_ptr<GMainLoop, void (*)(GMainLoop *)> mMainLoop;
 	std::thread mMainLoopThread;
 	guint mTimeoutId = 0;
+	std::mutex mOutgoingMutex;
+	unsigned int mOutgoingDscp;
 
 	static string AddressToString(const NiceAddress &addr);
 
@@ -113,9 +114,6 @@ private:
 	static gboolean TimeoutCallback(gpointer userData);
 	static void LogCallback(const gchar *log_domain, GLogLevelFlags log_level, const gchar *message,
 	                        gpointer user_data);
-	static CandidateType NiceTypeToCandidateType(NiceCandidateType type);
-	static CandidateTransportType
-	NiceTransportTypeToCandidateTransportType(NiceCandidateTransport type);
 #endif
 };
 

src/init.cpp

@@ -142,4 +142,3 @@ Init::~Init() {
 }
 
 } // namespace rtc
-

src/log.cpp

@@ -24,6 +24,8 @@
 #include "plog/Log.h"
 #include "plog/Logger.h"
 
+#include <mutex>
+
 namespace rtc {
 
 void InitLogger(LogLevel level) { InitLogger(static_cast<plog::Severity>(level)); }
@@ -31,6 +33,8 @@ void InitLogger(LogLevel level) { InitLogger(static_cast<plog::Severity>(level))
 void InitLogger(plog::Severity severity, plog::IAppender *appender) {
 	static plog::ColorConsoleAppender<plog::TxtFormatter> consoleAppender;
 	static plog::Logger<0> *logger = nullptr;
+	static std::mutex mutex;
+	std::lock_guard lock(mutex);
 	if (!logger) {
 		logger = &plog::init(severity, appender ? appender : &consoleAppender);
 		PLOG_DEBUG << "Logger initialized";
@@ -40,5 +44,4 @@ void InitLogger(plog::Severity severity, plog::IAppender *appender) {
 			logger->addAppender(appender);
 	}
 }
-}
-
+} // namespace rtc

src/processor.cpp

@@ -20,6 +20,8 @@
 
 namespace rtc {
 
+Processor::Processor(size_t limit) : mTasks(limit) {}
+
 Processor::~Processor() { join(); }
 
 void Processor::join() {
@@ -29,16 +31,13 @@ void Processor::join() {
 
 void Processor::schedule() {
 	std::unique_lock lock(mMutex);
-	if (mTasks.empty()) {
+	if (auto next = mTasks.tryPop()) {
+		ThreadPool::Instance().enqueue(std::move(*next));
+	} else {
 		// No more tasks
 		mPending = false;
 		mCondition.notify_all();
-		return;
 	}
-
-	ThreadPool::Instance().enqueue(std::move(mTasks.front()));
-	mTasks.pop();
 }
 
 } // namespace rtc
-

src/processor.hpp

@@ -22,6 +22,7 @@
 #include "include.hpp"
 #include "init.hpp"
 #include "threadpool.hpp"
+#include "queue.hpp"
 
 #include <condition_variable>
 #include <future>
@@ -34,7 +35,7 @@ namespace rtc {
 // Processed tasks in order by delegating them to the thread pool
 class Processor final {
 public:
-	Processor() = default;
+	Processor(size_t limit = 0);
 	~Processor();
 
 	Processor(const Processor &) = delete;
@@ -44,8 +45,7 @@ public:
 
 	void join();
 
-	template <class F, class... Args>
-	auto enqueue(F &&f, Args &&... args) -> invoke_future_t<F, Args...>;
+	template <class F, class... Args> void enqueue(F &&f, Args &&... args);
 
 protected:
 	void schedule();
@@ -53,38 +53,27 @@ protected:
 	// Keep an init token
 	const init_token mInitToken = Init::Token();
 
-	std::queue<std::function<void()>> mTasks;
+	Queue<std::function<void()>> mTasks;
 	bool mPending = false; // true iff a task is pending in the thread pool
 
 	mutable std::mutex mMutex;
 	std::condition_variable mCondition;
 };
 
-template <class F, class... Args>
-auto Processor::enqueue(F &&f, Args &&... args) -> invoke_future_t<F, Args...> {
+template <class F, class... Args> void Processor::enqueue(F &&f, Args &&... args) {
 	std::unique_lock lock(mMutex);
-	using R = std::invoke_result_t<std::decay_t<F>, std::decay_t<Args>...>;
-	auto task = std::make_shared<std::packaged_task<R()>>(
-	    std::bind(std::forward<F>(f), std::forward<Args>(args)...));
-	std::future<R> result = task->get_future();
-
-	auto bundle = [this, task = std::move(task)]() {
-		try {
-			(*task)();
-		} catch (const std::exception &e) {
-			PLOG_WARNING << "Unhandled exception in task: " << e.what();
-		}
-		schedule(); // chain the next task
+	auto bound = std::bind(std::forward<F>(f), std::forward<Args>(args)...);
+	auto task = [this, bound = std::move(bound)]() mutable {
+		scope_guard guard(std::bind(&Processor::schedule, this)); // chain the next task
+		return bound();
 	};
 
 	if (!mPending) {
-		ThreadPool::Instance().enqueue(std::move(bundle));
+		ThreadPool::Instance().enqueue(std::move(task));
 		mPending = true;
 	} else {
-		mTasks.emplace(std::move(bundle));
+		mTasks.push(std::move(task));
 	}
-
-	return result;
 }
 
 } // namespace rtc

src/rtcp.cpp

@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2020 Staz M
+ * Copyright (c) 2020 Staz Modrzynski
  * Copyright (c) 2020 Paul-Louis Ageneau
  *
  * This library is free software; you can redistribute it and/or
@@ -19,6 +19,7 @@
 
 #include "rtcp.hpp"
 
+#include "track.hpp"
 #include <cmath>
 #include <utility>
 
@@ -28,310 +29,11 @@
 #include <arpa/inet.h>
 #endif
 
-#ifndef htonll
-#define htonll(x)                                                                                  \
-	((uint64_t)htonl(((uint64_t)(x)&0xFFFFFFFF) << 32) | (uint64_t)htonl((uint64_t)(x) >> 32))
-#endif
-#ifndef ntohll
-#define ntohll(x) htonll(x)
-#endif
-
 namespace rtc {
 
-#pragma pack(push, 1)
+rtc::message_ptr RtcpReceivingSession::outgoing(rtc::message_ptr ptr) { return ptr; }
 
-struct RTP {
-private:
-	uint8_t _first;
-	uint8_t _payloadType;
-	uint16_t _seqNumber;
-	uint32_t _timestamp;
-
-public:
-	SSRC ssrc;
-	SSRC csrc[16];
-
-	inline uint8_t version() const { return _first >> 6; }
-	inline bool padding() const { return (_first >> 5) & 0x01; }
-	inline uint8_t csrcCount() const { return _first & 0x0F; }
-	inline uint8_t payloadType() const { return _payloadType; }
-	inline uint16_t seqNumber() const { return ntohs(_seqNumber); }
-	inline uint32_t timestamp() const { return ntohl(_timestamp); }
-};
-
-struct RTCP_ReportBlock {
-	SSRC ssrc;
-
-private:
-	uint32_t _fractionLostAndPacketsLost; // fraction lost is 8-bit, packets lost is 24-bit
-	uint16_t _seqNoCycles;
-	uint16_t _highestSeqNo;
-	uint32_t _jitter;
-	uint32_t _lastReport;
-	uint32_t _delaySinceLastReport;
-
-public:
-	inline void preparePacket(SSRC ssrc_, [[maybe_unused]] unsigned int packetsLost,
-	                          [[maybe_unused]] unsigned int totalPackets, uint16_t highestSeqNo,
-	                          uint16_t seqNoCycles, uint32_t jitter, uint64_t lastSR_NTP,
-	                          uint64_t lastSR_DELAY) {
-		setSeqNo(highestSeqNo, seqNoCycles);
-		setJitter(jitter);
-		setSSRC(ssrc_);
-
-		// Middle 32 bits of NTP Timestamp
-		// _lastReport = lastSR_NTP >> 16u;
-		setNTPOfSR(uint32_t(lastSR_NTP));
-		setDelaySinceSR(uint32_t(lastSR_DELAY));
-
-		// The delay, expressed in units of 1/65536 seconds
-		// _delaySinceLastReport = lastSR_DELAY;
-	}
-
-	inline void setSSRC(SSRC ssrc_) { ssrc = htonl(ssrc_); }
-	inline SSRC getSSRC() const { return ntohl(ssrc); }
-
-	inline void setPacketsLost([[maybe_unused]] unsigned int packetsLost,
-	                           [[maybe_unused]] unsigned int totalPackets) {
-		// TODO Implement loss percentages.
-		_fractionLostAndPacketsLost = 0;
-	}
-	inline unsigned int getLossPercentage() const {
-		// TODO Implement loss percentages.
-		return 0;
-	}
-	inline unsigned int getPacketLostCount() const {
-		// TODO Implement total packets lost.
-		return 0;
-	}
-
-	inline uint16_t seqNoCycles() const { return ntohs(_seqNoCycles); }
-	inline uint16_t highestSeqNo() const { return ntohs(_highestSeqNo); }
-	inline uint32_t jitter() const { return ntohl(_jitter); }
-
-	inline void setSeqNo(uint16_t highestSeqNo, uint16_t seqNoCycles) {
-		_highestSeqNo = htons(highestSeqNo);
-		_seqNoCycles = htons(seqNoCycles);
-	}
-
-	inline void setJitter(uint32_t jitter) { _jitter = htonl(jitter); }
-
-	inline void setNTPOfSR(uint32_t ntp) { _lastReport = htonl(ntp >> 16u); }
-	inline uint32_t getNTPOfSR() const { return ntohl(_lastReport) << 16u; }
-
-	inline void setDelaySinceSR(uint32_t sr) {
-		// The delay, expressed in units of 1/65536 seconds
-		_delaySinceLastReport = htonl(sr);
-	}
-	inline uint32_t getDelaySinceSR() const { return ntohl(_delaySinceLastReport); }
-
-	inline void log() const {
-		PLOG_DEBUG << "RTCP report block: "
-		           << "ssrc="
-		           << ntohl(ssrc)
-		           // TODO: Implement these reports
-		           //	<< ", fractionLost=" << fractionLost
-		           //	<< ", packetsLost=" << packetsLost
-		           << ", highestSeqNo=" << highestSeqNo() << ", seqNoCycles=" << seqNoCycles()
-		           << ", jitter=" << jitter() << ", lastSR=" << getNTPOfSR()
-		           << ", lastSRDelay=" << getDelaySinceSR();
-	}
-};
-
-struct RTCP_HEADER {
-private:
-	uint8_t _first;
-	uint8_t _payloadType;
-	uint16_t _length;
-
-public:
-	inline uint8_t version() const { return _first >> 6; }
-	inline bool padding() const { return (_first >> 5) & 0x01; }
-	inline uint8_t reportCount() const { return _first & 0x0F; }
-	inline uint8_t payloadType() const { return _payloadType; }
-	inline uint16_t length() const { return ntohs(_length); }
-
-	inline void setPayloadType(uint8_t type) { _payloadType = type; }
-	inline void setReportCount(uint8_t count) { _first = (_first & 0xF0) | (count & 0x0F); }
-	inline void setLength(uint16_t length) { _length = htons(length); }
-
-	inline void prepareHeader(uint8_t payloadType, uint8_t reportCount, uint16_t length) {
-		_first = 0x02 << 6; // version 2, no padding
-		setReportCount(reportCount);
-		setPayloadType(payloadType);
-		setLength(length);
-	}
-
-	inline void log() const {
-		PLOG_DEBUG << "RTCP header: "
-		           << "version=" << unsigned(version()) << ", padding=" << padding()
-		           << ", reportCount=" << unsigned(reportCount())
-		           << ", payloadType=" << unsigned(payloadType()) << ", length=" << length();
-	}
-};
-
-struct RTCP_SR {
-	RTCP_HEADER header;
-	SSRC senderSsrc;
-
-private:
-	uint64_t _ntpTimestamp;
-	uint32_t _rtpTimestamp;
-	uint32_t _packetCount;
-	uint32_t _octetCount;
-
-	RTCP_ReportBlock _reportBlocks;
-
-public:
-	inline void preparePacket(SSRC senderSsrc_, uint8_t reportCount) {
-		unsigned int length =
-		    ((sizeof(header) + 24 + reportCount * sizeof(RTCP_ReportBlock)) / 4) - 1;
-		header.prepareHeader(200, reportCount, uint16_t(length));
-		senderSsrc = htonl(senderSsrc_);
-	}
-
-	inline RTCP_ReportBlock *getReportBlock(int num) { return &_reportBlocks + num; }
-	inline const RTCP_ReportBlock *getReportBlock(int num) const { return &_reportBlocks + num; }
-
-	[[nodiscard]] inline size_t getSize() const {
-		// "length" in packet is one less than the number of 32 bit words in the packet.
-		return sizeof(uint32_t) * (1 + size_t(header.length()));
-	}
-
-	inline uint32_t ntpTimestamp() const { return ntohll(_ntpTimestamp); }
-	inline uint32_t rtpTimestamp() const { return ntohl(_rtpTimestamp); }
-	inline uint32_t packetCount() const { return ntohl(_packetCount); }
-	inline uint32_t octetCount() const { return ntohl(_octetCount); }
-
-	inline void setNtpTimestamp(uint32_t ts) { _ntpTimestamp = htonll(ts); }
-	inline void setRtpTimestamp(uint32_t ts) { _rtpTimestamp = htonl(ts); }
-
-	inline void log() const {
-		header.log();
-		PLOG_DEBUG << "RTCP SR: "
-		           << " SSRC=" << ntohl(senderSsrc) << ", NTP_TS=" << ntpTimestamp()
-		           << ", RTP_TS=" << rtpTimestamp() << ", packetCount=" << packetCount()
-		           << ", octetCount=" << octetCount();
-
-		for (unsigned i = 0; i < unsigned(header.reportCount()); i++) {
-			getReportBlock(i)->log();
-		}
-	}
-};
-
-struct RTCP_RR {
-	RTCP_HEADER header;
-	SSRC senderSsrc;
-
-private:
-	RTCP_ReportBlock _reportBlocks;
-
-public:
-	inline RTCP_ReportBlock *getReportBlock(int num) { return &_reportBlocks + num; }
-	inline const RTCP_ReportBlock *getReportBlock(int num) const { return &_reportBlocks + num; }
-
-	inline SSRC getSenderSSRC() const { return ntohl(senderSsrc); }
-	inline void setSenderSSRC(SSRC ssrc) { senderSsrc = htonl(ssrc); }
-
-	[[nodiscard]] inline size_t getSize() const {
-		// "length" in packet is one less than the number of 32 bit words in the packet.
-		return sizeof(uint32_t) * (1 + size_t(header.length()));
-	}
-
-	inline void preparePacket(SSRC ssrc, uint8_t reportCount) {
-		// "length" in packet is one less than the number of 32 bit words in the packet.
-		size_t length = (sizeWithReportBlocks(reportCount) / 4) - 1;
-		header.prepareHeader(201, reportCount, uint16_t(length));
-		senderSsrc = htonl(ssrc);
-	}
-
-	inline static size_t sizeWithReportBlocks(uint8_t reportCount) {
-		return sizeof(header) + 4 + size_t(reportCount) * sizeof(RTCP_ReportBlock);
-	}
-
-	inline void log() const {
-		header.log();
-		PLOG_DEBUG << "RTCP RR: "
-		           << " SSRC=" << ntohl(senderSsrc);
-
-		for (unsigned i = 0; i < unsigned(header.reportCount()); i++) {
-			getReportBlock(i)->log();
-		}
-	}
-};
-
-struct RTCP_REMB {
-	RTCP_HEADER header;
-	SSRC senderSsrc;
-	SSRC mediaSourceSSRC;
-
-	// Unique identifier
-	const char id[4] = {'R', 'E', 'M', 'B'};
-
-	// Num SSRC, Br Exp, Br Mantissa (bit mask)
-	uint32_t bitrate;
-
-	SSRC ssrc[1];
-
-	[[nodiscard]] inline size_t getSize() const {
-		// "length" in packet is one less than the number of 32 bit words in the packet.
-		return sizeof(uint32_t) * (1 + size_t(header.length()));
-	}
-
-	inline void preparePacket(SSRC senderSsrc_, unsigned int numSSRC, unsigned int br) {
-		// Report Count becomes the format here.
-		header.prepareHeader(206, 15, 0);
-
-		// Always zero.
-		mediaSourceSSRC = 0;
-
-		senderSsrc = htonl(senderSsrc_);
-		setBitrate(numSSRC, br);
-	}
-
-	inline void setBitrate(unsigned int numSSRC, unsigned int br) {
-		unsigned int exp = 0;
-		while (br > pow(2, 18) - 1) {
-			exp++;
-			br /= 2;
-		}
-
-		// "length" in packet is one less than the number of 32 bit words in the packet.
-		header.setLength(uint16_t(((sizeof(header) + 4 * 2 + 4 + 4) / 4) - 1 + numSSRC));
-
-		bitrate = htonl((numSSRC << (32u - 8u)) | (exp << (32u - 8u - 6u)) | br);
-	}
-
-	// TODO Make this work
-	//	  uint64_t getBitrate() const{
-	//		  uint32_t ntohed = ntohl(bitrate);
-	//		  uint64_t bitrate = ntohed & (unsigned int)(pow(2, 18)-1);
-	//		  unsigned int exp = ntohed & ((unsigned int)( (pow(2, 6)-1)) << (32u-8u-6u));
-	//		  return bitrate * pow(2,exp);
-	//	  }
-	//
-	//	  uint8_t getNumSSRCS() const {
-	//		  return ntohl(bitrate) & (((unsigned int) pow(2,8)-1) << (32u-8u));
-	//	  }
-
-	inline void setSSRC(uint8_t iterator, SSRC ssrc_) { ssrc[iterator] = htonl(ssrc_); }
-
-	inline void log() const {
-		header.log();
-		PLOG_DEBUG << "RTCP REMB: "
-		           << " SSRC=" << ntohl(senderSsrc);
-	}
-
-	static unsigned int sizeWithSSRCs(int numSSRC) {
-		return (sizeof(header) + 4 * 2 + 4 + 4) + sizeof(SSRC) * numSSRC;
-	}
-};
-
-#pragma pack(pop)
-
-void RtcpSession::onOutgoing(std::function<void(rtc::message_ptr)> cb) { mTxCallback = cb; }
-
-std::optional<rtc::message_ptr> RtcpSession::incoming(rtc::message_ptr ptr) {
+rtc::message_ptr RtcpReceivingSession::incoming(rtc::message_ptr ptr) {
 	if (ptr->type == rtc::Message::Type::Binary) {
 		auto rtp = reinterpret_cast<const RTP *>(ptr->data());
 
@@ -339,12 +41,12 @@ std::optional<rtc::message_ptr> RtcpSession::incoming(rtc::message_ptr ptr) {
 		if (rtp->version() != 2) {
 			PLOG_WARNING << "RTP packet is not version 2";
 
-			return std::nullopt;
+			return nullptr;
 		}
 		if (rtp->payloadType() == 201 || rtp->payloadType() == 200) {
 			PLOG_WARNING << "RTP packet has a payload type indicating RR/SR";
 
-			return std::nullopt;
+			return nullptr;
 		}
 
 		// TODO Implement the padding bit
@@ -352,13 +54,7 @@ std::optional<rtc::message_ptr> RtcpSession::incoming(rtc::message_ptr ptr) {
 			PLOG_WARNING << "Padding processing not implemented";
 		}
 
-		mSsrc = ntohl(rtp->ssrc);
-
-		uint32_t seqNo = rtp->seqNumber();
-		// uint32_t rtpTS = rtp->getTS();
-
-		if (mGreatestSeqNo < seqNo)
-			mGreatestSeqNo = seqNo;
+		mSsrc = rtp->ssrc();
 
 		return ptr;
 	}
@@ -367,11 +63,11 @@ std::optional<rtc::message_ptr> RtcpSession::incoming(rtc::message_ptr ptr) {
 	auto rr = reinterpret_cast<const RTCP_RR *>(ptr->data());
 	if (rr->header.payloadType() == 201) {
 		// RR
-		mSsrc = rr->getSenderSSRC();
+		mSsrc = rr->senderSSRC();
 		rr->log();
 	} else if (rr->header.payloadType() == 200) {
 		// SR
-		mSsrc = rr->getSenderSSRC();
+		mSsrc = rr->senderSSRC();
 		auto sr = reinterpret_cast<const RTCP_SR *>(ptr->data());
 		mSyncRTPTS = sr->rtpTimestamp();
 		mSyncNTPTS = sr->ntpTimestamp();
@@ -382,28 +78,27 @@ std::optional<rtc::message_ptr> RtcpSession::incoming(rtc::message_ptr ptr) {
 		if (mRequestedBitrate > 0)
 			pushREMB(mRequestedBitrate);
 	}
-	return std::nullopt;
+	return nullptr;
 }
 
-void RtcpSession::requestBitrate(unsigned int newBitrate) {
+void RtcpReceivingSession::requestBitrate(unsigned int newBitrate) {
 	mRequestedBitrate = newBitrate;
 
 	PLOG_DEBUG << "[GOOG-REMB] Requesting bitrate: " << newBitrate << std::endl;
 	pushREMB(newBitrate);
 }
 
-void RtcpSession::pushREMB(unsigned int bitrate) {
+void RtcpReceivingSession::pushREMB(unsigned int bitrate) {
 	rtc::message_ptr msg =
 	    rtc::make_message(RTCP_REMB::sizeWithSSRCs(1), rtc::Message::Type::Control);
 	auto remb = reinterpret_cast<RTCP_REMB *>(msg->data());
 	remb->preparePacket(mSsrc, 1, bitrate);
-	remb->setSSRC(0, mSsrc);
-	remb->log();
+	remb->setSsrc(0, mSsrc);
 
-	tx(msg);
+	send(msg);
 }
 
-void RtcpSession::pushRR(unsigned int lastSR_delay) {
+void RtcpReceivingSession::pushRR(unsigned int lastSR_delay) {
 	auto msg = rtc::make_message(RTCP_RR::sizeWithReportBlocks(1), rtc::Message::Type::Control);
 	auto rr = reinterpret_cast<RTCP_RR *>(msg->data());
 	rr->preparePacket(mSsrc, 1);
@@ -411,16 +106,32 @@ void RtcpSession::pushRR(unsigned int lastSR_delay) {
 	                                     lastSR_delay);
 	rr->log();
 
-	tx(msg);
+	send(msg);
 }
 
-void RtcpSession::tx(message_ptr msg) {
+bool RtcpReceivingSession::send(message_ptr msg) {
 	try {
-		mTxCallback(msg);
+		outgoingCallback(std::move(msg));
+		return true;
 	} catch (const std::exception &e) {
 		LOG_DEBUG << "RTCP tx failed: " << e.what();
 	}
+	return false;
 }
 
-} // namespace rtc
+bool RtcpReceivingSession::requestKeyframe() {
+	pushPLI();
+	return true; // TODO Make this false when it is impossible (i.e. Opus).
+}
 
+void RtcpReceivingSession::pushPLI() {
+	auto msg = rtc::make_message(rtc::RTCP_PLI::size(), rtc::Message::Type::Control);
+	auto *pli = reinterpret_cast<rtc::RTCP_PLI *>(msg->data());
+	pli->preparePacket(mSsrc);
+	send(msg);
+}
+
+void RtcpHandler::onOutgoing(const std::function<void(rtc::message_ptr)> &cb) {
+	this->outgoingCallback = synchronized_callback<rtc::message_ptr>(cb);
+}
+} // namespace rtc

src/sctptransport.cpp

@@ -88,7 +88,7 @@ void SctpTransport::Cleanup() {
 SctpTransport::SctpTransport(std::shared_ptr<Transport> lower, uint16_t port,
                              message_callback recvCallback, amount_callback bufferedAmountCallback,
                              state_callback stateChangeCallback)
-    : Transport(lower, std::move(stateChangeCallback)), mPort(port),
+    : Transport(lower, std::move(stateChangeCallback)), mPort(port), mPendingRecvCount(0),
       mSendQueue(0, message_size_func), mBufferedAmountCallback(std::move(bufferedAmountCallback)) {
 	onRecv(recvCallback);
 
@@ -100,11 +100,12 @@ SctpTransport::SctpTransport(std::shared_ptr<Transport> lower, uint16_t port,
 		Instances.insert(this);
 	}
 
-	mSock = usrsctp_socket(AF_CONN, SOCK_STREAM, IPPROTO_SCTP, &SctpTransport::RecvCallback,
-	                       &SctpTransport::SendCallback, 0, this);
+	mSock = usrsctp_socket(AF_CONN, SOCK_STREAM, IPPROTO_SCTP, nullptr, nullptr, 0, nullptr);
 	if (!mSock)
 		throw std::runtime_error("Could not create SCTP socket, errno=" + std::to_string(errno));
 
+	usrsctp_set_upcall(mSock, &SctpTransport::UpcallCallback, this);
+
 	if (usrsctp_set_non_blocking(mSock, 1))
 		throw std::runtime_error("Unable to set non-blocking mode, errno=" + std::to_string(errno));
 
@@ -122,6 +123,10 @@ SctpTransport::SctpTransport(std::shared_ptr<Transport> lower, uint16_t port,
 	if (usrsctp_setsockopt(mSock, IPPROTO_SCTP, SCTP_ENABLE_STREAM_RESET, &av, sizeof(av)))
 		throw std::runtime_error("Could not set socket option SCTP_ENABLE_STREAM_RESET, errno=" +
 		                         std::to_string(errno));
+	int on = 1;
+	if (usrsctp_setsockopt(mSock, IPPROTO_SCTP, SCTP_RECVRCVINFO, &on, sizeof(on)))
+		throw std::runtime_error("Could set socket option SCTP_RECVRCVINFO, errno=" +
+		                         std::to_string(errno));
 
 	struct sctp_event se = {};
 	se.se_assoc_id = SCTP_ALL_ASSOC;
@@ -148,7 +153,7 @@ SctpTransport::SctpTransport(std::shared_ptr<Transport> lower, uint16_t port,
 
 	struct sctp_paddrparams spp = {};
 #if USE_PMTUD
-	// Enabled SCTP path MTU discovery
+	// Enable SCTP path MTU discovery
 	spp.spp_flags = SPP_PMTUD_ENABLE;
 #else
 	// Fall back to a safe MTU value.
@@ -225,6 +230,7 @@ bool SctpTransport::stop() {
 
 void SctpTransport::close() {
 	if (mSock) {
+		mProcessor.join();
 		usrsctp_close(mSock);
 		mSock = nullptr;
 	}
@@ -232,7 +238,7 @@ void SctpTransport::close() {
 
 void SctpTransport::connect() {
 	if (!mSock)
-		return;
+		throw std::logic_error("Attempted SCTP connect with closed socket");
 
 	PLOG_DEBUG << "SCTP connecting";
 	changeState(State::Connecting);
@@ -305,7 +311,7 @@ void SctpTransport::incoming(message_ptr message) {
 	// to be sent on our side (i.e. the local INIT) before proceeding.
 	if (!mWrittenOnce) { // test the atomic boolean is not set first to prevent a lock contention
 		std::unique_lock lock(mWriteMutex);
-		mWrittenCondition.wait(lock, [&]() { return mWrittenOnce || state() != State::Connected; });
+		mWrittenCondition.wait(lock, [&]() { return mWrittenOnce.load(); });
 	}
 
 	if (!message) {
@@ -319,6 +325,67 @@ void SctpTransport::incoming(message_ptr message) {
 	usrsctp_conninput(this, message->data(), message->size(), 0);
 }
 
+bool SctpTransport::outgoing(message_ptr message) {
+	// Set recommended medium-priority DSCP value
+	// See https://tools.ietf.org/html/draft-ietf-tsvwg-rtcweb-qos-18
+	message->dscp = 10; // AF11: Assured Forwarding class 1, low drop probability
+	return Transport::outgoing(std::move(message));
+}
+
+void SctpTransport::doRecv() {
+	std::lock_guard lock(mRecvMutex);
+	--mPendingRecvCount;
+	try {
+		while (true) {
+			const size_t bufferSize = 65536;
+			byte buffer[bufferSize];
+			socklen_t fromlen = 0;
+			struct sctp_rcvinfo info = {};
+			socklen_t infolen = sizeof(info);
+			unsigned int infotype = 0;
+			int flags = 0;
+			ssize_t len = usrsctp_recvv(mSock, buffer, bufferSize, nullptr, &fromlen, &info,
+			                            &infolen, &infotype, &flags);
+			if (len < 0) {
+				if (errno == EWOULDBLOCK || errno == EAGAIN || errno == ECONNRESET)
+					break;
+				else
+					throw std::runtime_error("SCTP recv failed, errno=" + std::to_string(errno));
+			}
+
+			PLOG_VERBOSE << "SCTP recv, len=" << len;
+
+			// SCTP_FRAGMENT_INTERLEAVE does not seem to work as expected for messages > 64KB,
+			// therefore partial notifications and messages need to be handled separately.
+			if (flags & MSG_NOTIFICATION) {
+				// SCTP event notification
+				mPartialNotification.insert(mPartialNotification.end(), buffer, buffer + len);
+				if (flags & MSG_EOR) {
+					// Notification is complete, process it
+					auto notification =
+					    reinterpret_cast<union sctp_notification *>(mPartialNotification.data());
+					processNotification(notification, mPartialNotification.size());
+					mPartialNotification.clear();
+				}
+			} else {
+				// SCTP message
+				mPartialMessage.insert(mPartialMessage.end(), buffer, buffer + len);
+				if (flags & MSG_EOR) {
+					// Message is complete, process it
+					if (infotype != SCTP_RECVV_RCVINFO)
+						throw std::runtime_error("Missing SCTP recv info");
+
+					processData(std::move(mPartialMessage), info.rcv_sid,
+					            PayloadId(ntohl(info.rcv_ppid)));
+					mPartialMessage.clear();
+				}
+			}
+		}
+	} catch (const std::exception &e) {
+		PLOG_WARNING << e.what();
+	}
+}
+
 bool SctpTransport::trySendQueue() {
 	// Requires mSendMutex to be locked
 	while (auto next = mSendQueue.peek()) {
@@ -472,44 +539,21 @@ bool SctpTransport::safeFlush() {
 	}
 }
 
-int SctpTransport::handleRecv(struct socket * /*sock*/, union sctp_sockstore /*addr*/,
-                              const byte *data, size_t len, struct sctp_rcvinfo info, int flags) {
-	try {
-		PLOG_VERBOSE << "Handle recv, len=" << len;
+void SctpTransport::handleUpcall() {
+	if (!mSock)
+		return;
 
-		// SCTP_FRAGMENT_INTERLEAVE does not seem to work as expected for messages > 64KB,
-		// therefore partial notifications and messages need to be handled separately.
-		if (flags & MSG_NOTIFICATION) {
-			// SCTP event notification
-			mPartialNotification.insert(mPartialNotification.end(), data, data + len);
-			if (flags & MSG_EOR) {
-				// Notification is complete, process it
-				processNotification(
-				    reinterpret_cast<const union sctp_notification *>(mPartialNotification.data()),
-				    mPartialNotification.size());
-				mPartialNotification.clear();
-			}
-		} else {
-			// SCTP message
-			mPartialMessage.insert(mPartialMessage.end(), data, data + len);
-			if (flags & MSG_EOR) {
-				// Message is complete, process it
-				processData(std::move(mPartialMessage), info.rcv_sid,
-				            PayloadId(ntohl(info.rcv_ppid)));
-				mPartialMessage.clear();
-			}
-		}
+	PLOG_VERBOSE << "Handle upcall";
 
-	} catch (const std::exception &e) {
-		PLOG_ERROR << "SCTP recv: " << e.what();
-		return -1;
+	int events = usrsctp_get_events(mSock);
+
+	if (events & SCTP_EVENT_READ && mPendingRecvCount == 0) {
+		++mPendingRecvCount;
+		mProcessor.enqueue(&SctpTransport::doRecv, this);
 	}
-	return 0; // success
-}
 
-int SctpTransport::handleSend(size_t free) {
-	PLOG_VERBOSE << "Handle send, free=" << free;
-	return safeFlush() ? 0 : -1;
+	if (events & SCTP_EVENT_WRITE)
+		mProcessor.enqueue(&SctpTransport::safeFlush, this);
 }
 
 int SctpTransport::handleWrite(byte *data, size_t len, uint8_t /*tos*/, uint8_t /*set_df*/) {
@@ -517,6 +561,7 @@ int SctpTransport::handleWrite(byte *data, size_t len, uint8_t /*tos*/, uint8_t
 		std::unique_lock lock(mWriteMutex);
 		PLOG_VERBOSE << "Handle write, len=" << len;
 
+		auto message = make_message(data, data + len);
 		if (!outgoing(make_message(data, data + len)))
 			return -1;
 
@@ -699,31 +744,14 @@ std::optional<milliseconds> SctpTransport::rtt() {
 	return milliseconds(status.sstat_primary.spinfo_srtt);
 }
 
-int SctpTransport::RecvCallback(struct socket *sock, union sctp_sockstore addr, void *data,
-                                size_t len, struct sctp_rcvinfo recv_info, int flags,
-                                void *ulp_info) {
-	auto *transport = static_cast<SctpTransport *>(ulp_info);
-
-	std::shared_lock lock(InstancesMutex);
-	if (Instances.find(transport) == Instances.end()) {
-		free(data);
-		return -1;
-	}
-
-	int ret =
-	    transport->handleRecv(sock, addr, static_cast<const byte *>(data), len, recv_info, flags);
-	free(data);
-	return ret;
-}
-
-int SctpTransport::SendCallback(struct socket *, uint32_t sb_free, void *ulp_info) {
-	auto *transport = static_cast<SctpTransport *>(ulp_info);
+void SctpTransport::UpcallCallback(struct socket *, void *arg, int /* flags */) {
+	auto *transport = static_cast<SctpTransport *>(arg);
 
 	std::shared_lock lock(InstancesMutex);
 	if (Instances.find(transport) == Instances.end())
-		return -1;
+		return;
 
-	return transport->handleSend(size_t(sb_free));
+	transport->handleUpcall();
 }
 
 int SctpTransport::WriteCallback(void *ptr, void *data, size_t len, uint8_t tos, uint8_t set_df) {

src/sctptransport.hpp

@@ -21,8 +21,10 @@
 
 #include "include.hpp"
 #include "peerconnection.hpp"
+#include "processor.hpp"
 #include "queue.hpp"
 #include "transport.hpp"
+#include "processor.hpp"
 
 #include <condition_variable>
 #include <functional>
@@ -35,7 +37,7 @@
 
 namespace rtc {
 
-class SctpTransport : public Transport {
+class SctpTransport final : public Transport {
 public:
 	static void Init();
 	static void Cleanup();
@@ -75,16 +77,16 @@ private:
 	void shutdown();
 	void close();
 	void incoming(message_ptr message) override;
+	bool outgoing(message_ptr message) override;
 
+	void doRecv();
 	bool trySendQueue();
 	bool trySendMessage(message_ptr message);
 	void updateBufferedAmount(uint16_t streamId, long delta);
 	void sendReset(uint16_t streamId);
 	bool safeFlush();
 
-	int handleRecv(struct socket *sock, union sctp_sockstore addr, const byte *data, size_t len,
-	               struct sctp_rcvinfo recv_info, int flags);
-	int handleSend(size_t free);
+	void handleUpcall();
 	int handleWrite(byte *data, size_t len, uint8_t tos, uint8_t set_df);
 
 	void processData(binary &&data, uint16_t streamId, PayloadId ppid);
@@ -93,14 +95,16 @@ private:
 	const uint16_t mPort;
 	struct socket *mSock;
 
-	std::mutex mSendMutex;
+	Processor mProcessor;
+	std::atomic<int> mPendingRecvCount;
+	std::mutex mRecvMutex, mSendMutex;
 	Queue<message_ptr> mSendQueue;
 	std::map<uint16_t, size_t> mBufferedAmount;
 	amount_callback mBufferedAmountCallback;
 
 	std::mutex mWriteMutex;
 	std::condition_variable mWrittenCondition;
-	std::atomic<bool> mWritten = false; // written outside lock
+	std::atomic<bool> mWritten = false;     // written outside lock
 	std::atomic<bool> mWrittenOnce = false; // same
 
 	binary mPartialMessage, mPartialNotification;
@@ -109,9 +113,7 @@ private:
 	// Stats
 	std::atomic<size_t> mBytesSent = 0, mBytesReceived = 0;
 
-	static int RecvCallback(struct socket *sock, union sctp_sockstore addr, void *data, size_t len,
-	                        struct sctp_rcvinfo recv_info, int flags, void *ulp_info);
-	static int SendCallback(struct socket *sock, uint32_t sb_free, void *ulp_info);
+	static void UpcallCallback(struct socket *sock, void *arg, int flags);
 	static int WriteCallback(void *sctp_ptr, void *data, size_t len, uint8_t tos, uint8_t set_df);
 
 	static std::unordered_set<SctpTransport *> Instances;

src/threadpool.cpp

@@ -58,11 +58,7 @@ void ThreadPool::run() {
 
 bool ThreadPool::runOne() {
 	if (auto task = dequeue()) {
-		try {
-			task();
-		} catch (const std::exception &e) {
-			PLOG_WARNING << "Unhandled exception in task: " << e.what();
-		}
+		task();
 		return true;
 	}
 	return false;
@@ -79,4 +75,3 @@ std::function<void()> ThreadPool::dequeue() {
 }
 
 } // namespace rtc
-

src/threadpool.hpp

@@ -73,8 +73,15 @@ template <class F, class... Args>
 auto ThreadPool::enqueue(F &&f, Args &&... args) -> invoke_future_t<F, Args...> {
 	std::unique_lock lock(mMutex);
 	using R = std::invoke_result_t<std::decay_t<F>, std::decay_t<Args>...>;
-	auto task = std::make_shared<std::packaged_task<R()>>(
-	    std::bind(std::forward<F>(f), std::forward<Args>(args)...));
+	auto bound = std::bind(std::forward<F>(f), std::forward<Args>(args)...);
+	auto task = std::make_shared<std::packaged_task<R()>>([bound = std::move(bound)]() mutable {
+		try {
+			return bound();
+		} catch (const std::exception &e) {
+			PLOG_WARNING << e.what();
+			throw;
+		}
+	});
 	std::future<R> result = task->get_future();
 
 	mTasks.emplace([task = std::move(task), token = Init::Token()]() { return (*task)(); });

src/tls.cpp

@@ -127,4 +127,3 @@ bool check(SSL *ssl, int ret, const string &message) {
 } // namespace rtc::openssl
 
 #endif
-

src/tls.hpp

@@ -56,12 +56,12 @@ gnutls_datum_t make_datum(char *data, size_t size);
 #include <openssl/ssl.h>
 
 #include <openssl/bio.h>
+#include <openssl/bn.h>
 #include <openssl/ec.h>
 #include <openssl/err.h>
 #include <openssl/pem.h>
-#include <openssl/x509.h>
 #include <openssl/rsa.h>
-#include <openssl/bn.h>
+#include <openssl/x509.h>
 
 #ifndef BIO_EOF
 #define BIO_EOF -1

src/tlstransport.cpp

@@ -62,10 +62,10 @@ TlsTransport::TlsTransport(shared_ptr<TcpTransport> lower, string host, state_ca
 		gnutls::check(gnutls_priority_set_direct(mSession, priorities, &err_pos),
 		              "Failed to set TLS priorities");
 
-       	PLOG_VERBOSE << "Server Name Indication: " << mHost;
+		PLOG_VERBOSE << "Server Name Indication: " << mHost;
 		gnutls_server_name_set(mSession, GNUTLS_NAME_DNS, mHost.data(), mHost.size());
 
- 		gnutls_session_set_ptr(mSession, this);
+		gnutls_session_set_ptr(mSession, this);
 		gnutls_transport_set_ptr(mSession, this);
 		gnutls_transport_set_push_function(mSession, WriteCallback);
 		gnutls_transport_set_pull_function(mSession, ReadCallback);
@@ -110,7 +110,7 @@ bool TlsTransport::send(message_ptr message) {
 
 	PLOG_VERBOSE << "Send size=" << message->size();
 
-	if(message->size() == 0)
+	if (message->size() == 0)
 		return true;
 
 	ssize_t ret;
@@ -207,10 +207,10 @@ ssize_t TlsTransport::ReadCallback(gnutls_transport_ptr_t ptr, void *data, size_
 	message_ptr &message = t->mIncomingMessage;
 	size_t &position = t->mIncomingMessagePosition;
 
-	if(message && position >= message->size())
+	if (message && position >= message->size())
 		message.reset();
 
-	if(!message) {
+	if (!message) {
 		position = 0;
 		while (auto next = t->mIncomingQueue.pop()) {
 			message = *next;
@@ -221,15 +221,14 @@ ssize_t TlsTransport::ReadCallback(gnutls_transport_ptr_t ptr, void *data, size_
 		}
 	}
 
-	if(message) {
+	if (message) {
 		size_t available = message->size() - position;
 		ssize_t len = std::min(maxlen, available);
 		std::memcpy(data, message->data() + position, len);
-		position+= len;
+		position += len;
 		gnutls_transport_set_errno(t->mSession, 0);
 		return len;
-	}
-	else {
+	} else {
 		// Closed
 		gnutls_transport_set_errno(t->mSession, 0);
 		return 0;

src/track.cpp

@@ -32,18 +32,43 @@ string Track::mid() const { return mMediaDescription.mid(); }
 
 Description::Media Track::description() const { return mMediaDescription; }
 
+void Track::setDescription(Description::Media description) {
+	if (description.mid() != mMediaDescription.mid())
+		throw std::logic_error("Media description mid does not match track mid");
+
+	mMediaDescription = std::move(description);
+}
+
 void Track::close() {
 	mIsClosed = true;
 	resetCallbacks();
 	setRtcpHandler(nullptr);
 }
 
-bool Track::send(message_variant data) { return outgoing(make_message(std::move(data))); }
+bool Track::send(message_variant data) {
+	if (mIsClosed)
+		throw std::runtime_error("Track is closed");
 
-bool Track::send(const byte *data, size_t size) {
-	return outgoing(std::make_shared<Message>(data, data + size, Message::Binary));
+	auto direction = mMediaDescription.direction();
+	if ((direction == Description::Direction::RecvOnly ||
+	     direction == Description::Direction::Inactive)) {
+		PLOG_WARNING << "Track media direction does not allow transmission, dropping";
+		return false;
+	}
+
+	auto message = make_message(std::move(data));
+
+	if (mRtcpHandler) {
+		message = mRtcpHandler->outgoing(message);
+		if (!message)
+			return false;
+	}
+
+	return outgoing(std::move(message));
 }
 
+bool Track::send(const byte *data, size_t size) { return send(binary(data, data + size)); }
+
 std::optional<message_variant> Track::receive() {
 	if (auto next = mRecvQueue.tryPop())
 		return to_variant(std::move(**next));
@@ -51,6 +76,13 @@ std::optional<message_variant> Track::receive() {
 	return nullopt;
 }
 
+std::optional<message_variant> Track::peek() {
+	if (auto next = mRecvQueue.peek())
+		return to_variant(std::move(**next));
+
+	return nullopt;
+}
+
 bool Track::isOpen(void) const {
 #if RTC_ENABLE_MEDIA
 	return !mIsClosed && mDtlsSrtpTransport.lock();
@@ -65,9 +97,7 @@ size_t Track::maxMessageSize() const {
 	return 65535 - 12 - 4; // SRTP/UDP
 }
 
-size_t Track::availableAmount() const {
-	return mRecvQueue.amount();
-}
+size_t Track::availableAmount() const { return mRecvQueue.amount(); }
 
 #if RTC_ENABLE_MEDIA
 void Track::open(shared_ptr<DtlsSrtpTransport> transport) {
@@ -76,73 +106,66 @@ void Track::open(shared_ptr<DtlsSrtpTransport> transport) {
 }
 #endif
 
-bool Track::outgoing(message_ptr message) {
-	auto direction = mMediaDescription.direction();
-	if (direction == Description::Direction::RecvOnly ||
-	    direction == Description::Direction::Inactive)
-		throw std::runtime_error("Track media direction does not allow sending");
-
-	if (mIsClosed)
-		throw std::runtime_error("Track is closed");
-
-	if (message->size() > maxMessageSize())
-		throw std::runtime_error("Message size exceeds limit");
-
-#if RTC_ENABLE_MEDIA
-	auto transport = mDtlsSrtpTransport.lock();
-	if (!transport)
-		throw std::runtime_error("Track transport is not open");
-
-	return transport->sendMedia(message);
-#else
-	PLOG_WARNING << "Ignoring track send (not compiled with SRTP support)";
-	return false;
-#endif
-}
-
 void Track::incoming(message_ptr message) {
 	if (!message)
 		return;
 
-	if (mRtcpHandler) {
-		auto opt = mRtcpHandler->incoming(message);
-		if (!opt)
-			return;
-
-		message = *opt;
-	}
-
 	auto direction = mMediaDescription.direction();
 	if ((direction == Description::Direction::SendOnly ||
 	     direction == Description::Direction::Inactive) &&
 	    message->type != Message::Control) {
 		PLOG_WARNING << "Track media direction does not allow reception, dropping";
+		return;
+	}
+
+	if (mRtcpHandler) {
+		message = mRtcpHandler->incoming(message);
+		if (!message)
+			return;
 	}
 
 	// Tail drop if queue is full
-	if (mRecvQueue.full())
+	if (mRecvQueue.full()) {
+		PLOG_WARNING << "Track incoming queue is full, dropping";
 		return;
+	}
 
 	mRecvQueue.push(message);
 	triggerAvailable(mRecvQueue.size());
 }
 
-void Track::setRtcpHandler(std::shared_ptr<RtcpHandler> handler) {
-	if (mRtcpHandler)
-		mRtcpHandler->onOutgoing(nullptr);
-
-	mRtcpHandler = std::move(handler);
-	if (mRtcpHandler) {
-		mRtcpHandler->onOutgoing([&]([[maybe_unused]] message_ptr message) {
+bool Track::outgoing([[maybe_unused]] message_ptr message) {
 #if RTC_ENABLE_MEDIA
-			if (auto transport = mDtlsSrtpTransport.lock())
-				transport->sendMedia(message);
+	auto transport = mDtlsSrtpTransport.lock();
+	if (!transport)
+		throw std::runtime_error("Track transport is not open");
+
+	// Set recommended medium-priority DSCP value
+	// See https://tools.ietf.org/html/draft-ietf-tsvwg-rtcweb-qos-18
+	if (mMediaDescription.type() == "audio")
+		message->dscp = 46; // EF: Expedited Forwarding
+	else
+		message->dscp = 36; // AF42: Assured Forwarding class 4, medium drop probability
+
+	return transport->sendMedia(message);
 #else
-			PLOG_WARNING << "Ignoring RTCP send (not compiled with SRTP support)";
+	PLOG_WARNING << "Ignoring track send (not compiled with media support)";
+	return false;
 #endif
-		});
-	}
 }
 
-} // namespace rtc
+void Track::setRtcpHandler(std::shared_ptr<RtcpHandler> handler) {
+	mRtcpHandler = std::move(handler);
+	if (mRtcpHandler)
+		mRtcpHandler->onOutgoing(std::bind(&Track::outgoing, this, std::placeholders::_1));
+}
 
+bool Track::requestKeyframe() {
+	if (mRtcpHandler)
+		return mRtcpHandler->requestKeyframe();
+	return false;
+}
+
+std::shared_ptr<RtcpHandler> Track::getRtcpHandler() { return mRtcpHandler; }
+
+} // namespace rtc

src/transport.hpp

@@ -28,16 +28,13 @@
 
 namespace rtc {
 
-using namespace std::placeholders;
-
 class Transport {
 public:
 	enum class State { Disconnected, Connecting, Connected, Completed, Failed };
 	using state_callback = std::function<void(State state)>;
 
 	Transport(std::shared_ptr<Transport> lower = nullptr, state_callback callback = nullptr)
-	    : mLower(std::move(lower)), mStateChangeCallback(std::move(callback)) {
-	}
+	    : mLower(std::move(lower)), mStateChangeCallback(std::move(callback)) {}
 
 	virtual ~Transport() { stop(); }
 
@@ -48,15 +45,18 @@ public:
 			return false;
 
 		// We don't want incoming() to be called by the lower layer anymore
-		if (mLower)
+		if (mLower) {
+			PLOG_VERBOSE << "Unregistering incoming callback";
 			mLower->onRecv(nullptr);
-
+		}
 		return true;
 	}
 
 	void registerIncoming() {
-		if (mLower)
-			mLower->onRecv(std::bind(&Transport::incoming, this, _1));
+		if (mLower) {
+			PLOG_VERBOSE << "Registering incoming callback";
+			mLower->onRecv(std::bind(&Transport::incoming, this, std::placeholders::_1));
+		}
 	}
 
 	void onRecv(message_callback callback) { mRecvCallback = std::move(callback); }

src/verifiedtlstransport.cpp

@@ -28,7 +28,6 @@ using std::weak_ptr;
 
 namespace rtc {
 
-
 VerifiedTlsTransport::VerifiedTlsTransport(shared_ptr<TcpTransport> lower, string host,
                                            state_callback callback)
     : TlsTransport(std::move(lower), std::move(host), std::move(callback)) {
@@ -48,4 +47,3 @@ VerifiedTlsTransport::~VerifiedTlsTransport() {}
 } // namespace rtc
 
 #endif
-

src/websocket.cpp

@@ -36,6 +36,7 @@
 namespace rtc {
 
 using std::shared_ptr;
+using namespace std::placeholders;
 
 WebSocket::WebSocket(std::optional<Configuration> config)
     : mConfig(config ? std::move(*config) : Configuration()),
@@ -51,31 +52,45 @@ WebSocket::~WebSocket() {
 WebSocket::State WebSocket::readyState() const { return mState; }
 
 void WebSocket::open(const string &url) {
+	PLOG_VERBOSE << "Opening WebSocket to URL: " << url;
+
 	if (mState != State::Closed)
-		throw std::runtime_error("WebSocket must be closed before opening");
+		throw std::logic_error("WebSocket must be closed before opening");
 
-	static const char *rs = R"(^(([^:\/?#]+):)?(//([^\/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?)";
-	static std::regex regex(rs, std::regex::extended);
+	// Modified regex from RFC 3986, see https://tools.ietf.org/html/rfc3986#appendix-B
+	static const char *rs =
+	    R"(^(([^:.@/?#]+):)?(/{0,2}((([^:@]*)(:([^@]*))?)@)?(([^:/?#]*)(:([^/?#]*))?))?([^?#]*)(\?([^#]*))?(#(.*))?)";
 
-	std::smatch match;
-	if (!std::regex_match(url, match, regex))
-		throw std::invalid_argument("Malformed WebSocket URL: " + url);
+	static const std::regex r(rs, std::regex::extended);
 
-	mScheme = match[2];
-	if (mScheme != "ws" && mScheme != "wss")
+	std::smatch m;
+	if (!std::regex_match(url, m, r) || m[10].length() == 0)
+		throw std::invalid_argument("Invalid WebSocket URL: " + url);
+
+	mScheme = m[2];
+	if (mScheme.empty())
+		mScheme = "ws";
+	else if (mScheme != "ws" && mScheme != "wss")
 		throw std::invalid_argument("Invalid WebSocket scheme: " + mScheme);
 
-	mHost = match[4];
-	if (auto pos = mHost.find(':'); pos != string::npos) {
-		mHostname = mHost.substr(0, pos);
-		mService = mHost.substr(pos + 1);
-	} else {
-		mHostname = mHost;
+	mHostname = m[10];
+	mService = m[12];
+	if (mService.empty()) {
 		mService = mScheme == "ws" ? "80" : "443";
+		mHost = mHostname;
+	} else {
+		mHost = mHostname + ':' + mService;
 	}
 
-	mPath = match[5];
-	if (string query = match[7]; !query.empty())
+	while (!mHostname.empty() && mHostname.front() == '[')
+		mHostname.erase(mHostname.begin());
+	while (!mHostname.empty() && mHostname.back() == ']')
+		mHostname.pop_back();
+
+	mPath = m[13];
+	if (mPath.empty())
+		mPath += '/';
+	if (string query = m[15]; !query.empty())
 		mPath += "?" + query;
 
 	changeState(State::Connecting);
@@ -103,6 +118,10 @@ void WebSocket::remoteClose() {
 
 bool WebSocket::send(message_variant data) { return outgoing(make_message(std::move(data))); }
 
+bool WebSocket::send(const byte *data, size_t size) {
+	return outgoing(make_message(data, data + size));
+}
+
 bool WebSocket::isOpen() const { return mState == State::Open; }
 
 bool WebSocket::isClosed() const { return mState == State::Closed; }
@@ -111,13 +130,24 @@ size_t WebSocket::maxMessageSize() const { return DEFAULT_MAX_MESSAGE_SIZE; }
 
 std::optional<message_variant> WebSocket::receive() {
 	while (auto next = mRecvQueue.tryPop()) {
-		message_ptr message = std::move(*next);
+		message_ptr message = *next;
 		if (message->type != Message::Control)
 			return to_variant(std::move(*message));
 	}
 	return nullopt;
 }
 
+std::optional<message_variant> WebSocket::peek() {
+	while (auto next = mRecvQueue.peek()) {
+		message_ptr message = *next;
+		if (message->type != Message::Control)
+			return to_variant(std::move(*message));
+
+		mRecvQueue.tryPop();
+	}
+	return nullopt;
+}
+
 size_t WebSocket::availableAmount() const { return mRecvQueue.amount(); }
 
 bool WebSocket::changeState(State state) { return mState.exchange(state) != state; }
@@ -145,6 +175,7 @@ void WebSocket::incoming(message_ptr message) {
 }
 
 shared_ptr<TcpTransport> WebSocket::initTcpTransport() {
+	PLOG_VERBOSE << "Starting TCP transport";
 	using State = TcpTransport::State;
 	try {
 		std::lock_guard lock(mInitMutex);
@@ -191,6 +222,7 @@ shared_ptr<TcpTransport> WebSocket::initTcpTransport() {
 }
 
 shared_ptr<TlsTransport> WebSocket::initTlsTransport() {
+	PLOG_VERBOSE << "Starting TLS transport";
 	using State = TlsTransport::State;
 	try {
 		std::lock_guard lock(mInitMutex);
@@ -224,12 +256,13 @@ shared_ptr<TlsTransport> WebSocket::initTlsTransport() {
 		if (!mConfig.disableTlsVerification) {
 			PLOG_WARNING << "TLS certificate verification with root CA is not supported on Windows";
 		}
-		transport = std::make_shared<TlsTransport>(lower, mHost, stateChangeCallback);
+		transport = std::make_shared<TlsTransport>(lower, mHostname, stateChangeCallback);
 #else
 		if (mConfig.disableTlsVerification)
-			transport = std::make_shared<TlsTransport>(lower, mHost, stateChangeCallback);
+			transport = std::make_shared<TlsTransport>(lower, mHostname, stateChangeCallback);
 		else
-			transport = std::make_shared<VerifiedTlsTransport>(lower, mHost, stateChangeCallback);
+			transport =
+			    std::make_shared<VerifiedTlsTransport>(lower, mHostname, stateChangeCallback);
 #endif
 
 		std::atomic_store(&mTlsTransport, transport);
@@ -248,6 +281,7 @@ shared_ptr<TlsTransport> WebSocket::initTlsTransport() {
 }
 
 shared_ptr<WsTransport> WebSocket::initWsTransport() {
+	PLOG_VERBOSE << "Starting WebSocket transport";
 	using State = WsTransport::State;
 	try {
 		std::lock_guard lock(mInitMutex);
@@ -257,8 +291,14 @@ shared_ptr<WsTransport> WebSocket::initWsTransport() {
 		shared_ptr<Transport> lower = std::atomic_load(&mTlsTransport);
 		if (!lower)
 			lower = std::atomic_load(&mTcpTransport);
+
+		WsTransport::Configuration wsConfig = {};
+		wsConfig.host = mHost;
+		wsConfig.path = mPath;
+		wsConfig.protocols = mConfig.protocols;
+
 		auto transport = std::make_shared<WsTransport>(
-		    lower, mHost, mPath, weak_bind(&WebSocket::incoming, this, _1),
+			lower, wsConfig, weak_bind(&WebSocket::incoming, this, _1),
 		    [this, weak_this = weak_from_this()](State state) {
 			    auto shared_this = weak_this.lock();
 			    if (!shared_this)
@@ -326,6 +366,6 @@ void WebSocket::closeTransports() {
 	});
 }
 
-	} // namespace rtc
+} // namespace rtc
 
 #endif

src/wstransport.cpp

@@ -17,15 +17,17 @@
  */
 
 #include "wstransport.hpp"
+#include "base64.hpp"
 #include "tcptransport.hpp"
 #include "tlstransport.hpp"
-#include "base64.hpp"
 
 #if RTC_ENABLE_WEBSOCKET
 
 #include <chrono>
+#include <iterator>
 #include <list>
 #include <map>
+#include <numeric>
 #include <random>
 #include <regex>
 
@@ -52,12 +54,18 @@ using std::to_string;
 using random_bytes_engine =
     std::independent_bits_engine<std::default_random_engine, CHAR_BIT, unsigned short>;
 
-WsTransport::WsTransport(std::shared_ptr<Transport> lower, string host, string path,
+WsTransport::WsTransport(std::shared_ptr<Transport> lower, Configuration config,
                          message_callback recvCallback, state_callback stateCallback)
-    : Transport(lower, std::move(stateCallback)), mHost(std::move(host)), mPath(std::move(path)) {
+    : Transport(lower, std::move(stateCallback)), mConfig(std::move(config)) {
 	onRecv(recvCallback);
 
 	PLOG_DEBUG << "Initializing WebSocket transport";
+
+	if (mConfig.host.empty())
+		throw std::invalid_argument("WebSocket HTTP host cannot be empty");
+
+	if (mConfig.path.empty())
+		throw std::invalid_argument("WebSocket HTTP path cannot be empty");
 }
 
 WsTransport::~WsTransport() { stop(); }
@@ -147,7 +155,7 @@ void WsTransport::close() {
 }
 
 bool WsTransport::sendHttpRequest() {
-	PLOG_DEBUG << "Sending WebSocket HTTP request";
+	PLOG_DEBUG << "Sending WebSocket HTTP request for path " << mConfig.path;
 	changeState(State::Connecting);
 
 	auto seed = static_cast<unsigned int>(system_clock::now().time_since_epoch().count());
@@ -157,18 +165,27 @@ bool WsTransport::sendHttpRequest() {
 	auto k = reinterpret_cast<uint8_t *>(key.data());
 	std::generate(k, k + key.size(), [&]() { return uint8_t(generator()); });
 
-	const string request = "GET " + mPath +
+	string appendHeader = "";
+	if (mConfig.protocols.size() > 0) {
+		appendHeader +=
+		    "Sec-WebSocket-Protocol: " +
+		    std::accumulate(mConfig.protocols.begin(), mConfig.protocols.end(), string(),
+		                    [](const string &a, const string &b) -> string {
+			                    return a + (a.length() > 0 ? "," : "") + b;
+		                    }) +
+		    "\r\n";
+	}
+
+	const string request = "GET " + mConfig.path +
 	                       " HTTP/1.1\r\n"
 	                       "Host: " +
-	                       mHost +
+	                       mConfig.host +
 	                       "\r\n"
 	                       "Connection: Upgrade\r\n"
 	                       "Upgrade: websocket\r\n"
 	                       "Sec-WebSocket-Version: 13\r\n"
 	                       "Sec-WebSocket-Key: " +
-	                       to_base64(key) +
-	                       "\r\n"
-	                       "\r\n";
+	                       to_base64(key) + "\r\n" + std::move(appendHeader) + "\r\n";
 
 	auto data = reinterpret_cast<const byte *>(request.data());
 	auto size = request.size();
@@ -221,8 +238,14 @@ size_t WsTransport::readHttpResponse(const byte *buffer, size_t size) {
 	}
 
 	auto h = headers.find("upgrade");
-	if (h == headers.end() || h->second != "websocket")
-		throw std::runtime_error("WebSocket update header missing or mismatching");
+	if (h == headers.end())
+		throw std::runtime_error("WebSocket update header missing");
+
+	string upgrade;
+	std::transform(h->second.begin(), h->second.end(), std::back_inserter(upgrade),
+	               [](char c) { return std::tolower(c); });
+	if (upgrade != "websocket")
+		throw std::runtime_error("WebSocket update header mismatching: " + h->second);
 
 	h = headers.find("sec-websocket-accept");
 	if (h == headers.end())

src/wstransport.hpp

@@ -31,7 +31,13 @@ class TlsTransport;
 
 class WsTransport : public Transport {
 public:
-	WsTransport(std::shared_ptr<Transport> lower, string host, string path,
+	struct Configuration {
+		string host;
+		string path = "/";
+		std::vector<string> protocols;
+	};
+
+	WsTransport(std::shared_ptr<Transport> lower, Configuration config,
 	            message_callback recvCallback, state_callback stateCallback);
 	~WsTransport();
 
@@ -68,12 +74,12 @@ private:
 	void recvFrame(const Frame &frame);
 	bool sendFrame(const Frame &frame);
 
-	const string mHost;
-	const string mPath;
+	const Configuration mConfig;
 
 	binary mBuffer;
 	binary mPartial;
 	Opcode mPartialOpcode;
+
 };
 
 } // namespace rtc

test/benchmark.cpp

@@ -169,9 +169,9 @@ size_t benchmark(milliseconds duration) {
 
 	pc1->close();
 	pc2->close();
-	this_thread::sleep_for(1s);
 
 	rtc::Cleanup();
+	this_thread::sleep_for(1s);
 	return goodput;
 }
 

test/capi_connectivity.cpp

@@ -29,9 +29,12 @@ static void sleep(unsigned int secs) { Sleep(secs * 1000); }
 #include <unistd.h> // for sleep
 #endif
 
+#define BUFFER_SIZE 4096
+
 typedef struct {
 	rtcState state;
 	rtcGatheringState gatheringState;
+	rtcSignalingState signalingState;
 	int pc;
 	int dc;
 	bool connected;
@@ -40,33 +43,39 @@ typedef struct {
 static Peer *peer1 = NULL;
 static Peer *peer2 = NULL;
 
-static void descriptionCallback(const char *sdp, const char *type, void *ptr) {
+static void RTC_API descriptionCallback(int pc, const char *sdp, const char *type, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	printf("Description %d:\n%s\n", peer == peer1 ? 1 : 2, sdp);
 	Peer *other = peer == peer1 ? peer2 : peer1;
 	rtcSetRemoteDescription(other->pc, sdp, type);
 }
 
-static void candidateCallback(const char *cand, const char *mid, void *ptr) {
+static void RTC_API candidateCallback(int pc, const char *cand, const char *mid, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	printf("Candidate %d: %s\n", peer == peer1 ? 1 : 2, cand);
 	Peer *other = peer == peer1 ? peer2 : peer1;
 	rtcAddRemoteCandidate(other->pc, cand, mid);
 }
 
-static void stateChangeCallback(rtcState state, void *ptr) {
+static void RTC_API stateChangeCallback(int pc, rtcState state, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	peer->state = state;
 	printf("State %d: %d\n", peer == peer1 ? 1 : 2, (int)state);
 }
 
-static void gatheringStateCallback(rtcGatheringState state, void *ptr) {
+static void RTC_API gatheringStateCallback(int pc, rtcGatheringState state, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	peer->gatheringState = state;
 	printf("Gathering state %d: %d\n", peer == peer1 ? 1 : 2, (int)state);
 }
 
-static void openCallback(void *ptr) {
+static void RTC_API signalingStateCallback(int pc, rtcSignalingState state, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->signalingState = state;
+	printf("Signaling state %d: %d\n", peer == peer1 ? 1 : 2, (int)state);
+}
+
+static void RTC_API openCallback(int id, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	peer->connected = true;
 	printf("DataChannel %d: Open\n", peer == peer1 ? 1 : 2);
@@ -75,12 +84,12 @@ static void openCallback(void *ptr) {
 	rtcSendMessage(peer->dc, message, -1); // negative size indicates a null-terminated string
 }
 
-static void closedCallback(void *ptr) {
+static void RTC_API closedCallback(int id, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	peer->connected = false;
 }
 
-static void messageCallback(const char *message, int size, void *ptr) {
+static void RTC_API messageCallback(int id, const char *message, int size, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	if (size < 0) { // negative size indicates a null-terminated string
 		printf("Message %d: %s\n", peer == peer1 ? 1 : 2, message);
@@ -89,16 +98,50 @@ static void messageCallback(const char *message, int size, void *ptr) {
 	}
 }
 
-static void dataChannelCallback(int dc, void *ptr) {
+static void RTC_API dataChannelCallback(int pc, int dc, void *ptr) {
 	Peer *peer = (Peer *)ptr;
-	peer->dc = dc;
-	peer->connected = true;
+
+	char label[256];
+	if (rtcGetDataChannelLabel(dc, label, 256) < 0) {
+		fprintf(stderr, "rtcGetDataChannelLabel failed\n");
+		return;
+	}
+
+	char protocol[256];
+	if (rtcGetDataChannelProtocol(dc, protocol, 256) < 0) {
+		fprintf(stderr, "rtcGetDataChannelProtocol failed\n");
+		return;
+	}
+
+	rtcReliability reliability;
+	if (rtcGetDataChannelReliability(dc, &reliability) < 0) {
+		fprintf(stderr, "rtcGetDataChannelReliability failed\n");
+		return;
+	}
+
+	printf("DataChannel %d: Received with label \"%s\" and protocol \"%s\"\n",
+	       peer == peer1 ? 1 : 2, label, protocol);
+
+	if (strcmp(label, "test") != 0) {
+		fprintf(stderr, "Wrong DataChannel label\n");
+		return;
+	}
+
+	if (strcmp(protocol, "protocol") != 0) {
+		fprintf(stderr, "Wrong DataChannel protocol\n");
+		return;
+	}
+
+	if (reliability.unordered == false) {
+		fprintf(stderr, "Wrong DataChannel reliability\n");
+		return;
+	}
+
 	rtcSetClosedCallback(dc, closedCallback);
 	rtcSetMessageCallback(dc, messageCallback);
 
-	char buffer[256];
-	if (rtcGetDataChannelLabel(dc, buffer, 256) >= 0)
-		printf("DataChannel %d: Received with label \"%s\"\n", peer == peer1 ? 1 : 2, buffer);
+	peer->dc = dc;
+	peer->connected = true;
 
 	const char *message = peer == peer1 ? "Hello from 1" : "Hello from 2";
 	rtcSendMessage(peer->dc, message, -1); // negative size indicates a null-terminated string
@@ -118,6 +161,7 @@ static Peer *createPeer(const rtcConfiguration *config) {
 	rtcSetLocalCandidateCallback(peer->pc, candidateCallback);
 	rtcSetStateChangeCallback(peer->pc, stateChangeCallback);
 	rtcSetGatheringStateChangeCallback(peer->pc, gatheringStateCallback);
+	rtcSetSignalingStateChangeCallback(peer->pc, signalingStateCallback);
 
 	return peer;
 }
@@ -164,7 +208,12 @@ int test_capi_connectivity_main() {
 		goto error;
 
 	// Peer 1: Create data channel
-	peer1->dc = rtcCreateDataChannel(peer1->pc, "test");
+	rtcDataChannelInit init;
+	memset(&init, 0, sizeof(init));
+	init.protocol = "protocol";
+	init.reliability.unordered = true;
+
+	peer1->dc = rtcCreateDataChannelEx(peer1->pc, "test", &init);
 	rtcSetOpenCallback(peer1->dc, openCallback);
 	rtcSetClosedCallback(peer1->dc, closedCallback);
 	rtcSetMessageCallback(peer1->dc, messageCallback);
@@ -183,15 +232,70 @@ int test_capi_connectivity_main() {
 		goto error;
 	}
 
-	char buffer[256];
-	if (rtcGetLocalAddress(peer1->pc, buffer, 256) >= 0)
-		printf("Local address 1:  %s\n", buffer);
-	if (rtcGetRemoteAddress(peer1->pc, buffer, 256) >= 0)
-		printf("Remote address 1: %s\n", buffer);
-	if (rtcGetLocalAddress(peer2->pc, buffer, 256) >= 0)
-		printf("Local address 2:  %s\n", buffer);
-	if (rtcGetRemoteAddress(peer2->pc, buffer, 256) >= 0)
-		printf("Remote address 2: %s\n", buffer);
+	char buffer[BUFFER_SIZE];
+	char buffer2[BUFFER_SIZE];
+
+	if (rtcGetLocalDescription(peer1->pc, buffer, BUFFER_SIZE) < 0) {
+		fprintf(stderr, "rtcGetLocalDescription failed\n");
+		goto error;
+	}
+	printf("Local description 1:  %s\n", buffer);
+
+	if (rtcGetRemoteDescription(peer1->pc, buffer, BUFFER_SIZE) < 0) {
+		fprintf(stderr, "rtcGetRemoteDescription failed\n");
+		goto error;
+	}
+	printf("Remote description 1:  %s\n", buffer);
+
+	if (rtcGetLocalDescription(peer2->pc, buffer, BUFFER_SIZE) < 0) {
+		fprintf(stderr, "rtcGetLocalDescription failed\n");
+		goto error;
+	}
+	printf("Local description 2:  %s\n", buffer);
+
+	if (rtcGetRemoteDescription(peer2->pc, buffer, BUFFER_SIZE) < 0) {
+		fprintf(stderr, "rtcGetRemoteDescription failed\n");
+		goto error;
+	}
+	printf("Remote description 2:  %s\n", buffer);
+
+	if (rtcGetLocalAddress(peer1->pc, buffer, BUFFER_SIZE) < 0) {
+		fprintf(stderr, "rtcGetLocalAddress failed\n");
+		goto error;
+	}
+	printf("Local address 1:  %s\n", buffer);
+
+	if (rtcGetRemoteAddress(peer1->pc, buffer, BUFFER_SIZE) < 0) {
+		fprintf(stderr, "rtcGetRemoteAddress failed\n");
+		goto error;
+	}
+	printf("Remote address 1: %s\n", buffer);
+
+	if (rtcGetLocalAddress(peer2->pc, buffer, BUFFER_SIZE) < 0) {
+		fprintf(stderr, "rtcGetLocalAddress failed\n");
+		goto error;
+	}
+	printf("Local address 2:  %s\n", buffer);
+
+	if (rtcGetRemoteAddress(peer2->pc, buffer, BUFFER_SIZE) < 0) {
+		fprintf(stderr, "rtcGetRemoteAddress failed\n");
+		goto error;
+	}
+	printf("Remote address 2: %s\n", buffer);
+
+	if (rtcGetSelectedCandidatePair(peer1->pc, buffer, BUFFER_SIZE, buffer2, BUFFER_SIZE) < 0) {
+		fprintf(stderr, "rtcGetSelectedCandidatePair failed\n");
+		goto error;
+	}
+	printf("Local candidate 1:  %s\n", buffer);
+	printf("Remote candidate 1: %s\n", buffer2);
+
+	if (rtcGetSelectedCandidatePair(peer2->pc, buffer, BUFFER_SIZE, buffer2, BUFFER_SIZE) < 0) {
+		fprintf(stderr, "rtcGetSelectedCandidatePair failed\n");
+		goto error;
+	}
+	printf("Local candidate 2:  %s\n", buffer);
+	printf("Remote candidate 2: %s\n", buffer2);
 
 	deletePeer(peer1);
 	sleep(1);
@@ -200,7 +304,7 @@ int test_capi_connectivity_main() {
 
 	// You may call rtcCleanup() when finished to free static resources
 	rtcCleanup();
-	sleep(2);
+	sleep(1);
 
 	printf("Success\n");
 	return 0;

test/capi_track.cpp

@@ -43,44 +43,44 @@ static Peer *peer2 = NULL;
 static const char *mediaDescription = "video 9 UDP/TLS/RTP/SAVPF\r\n"
                                       "a=mid:video\r\n";
 
-static void descriptionCallback(const char *sdp, const char *type, void *ptr) {
+static void RTC_API descriptionCallback(int pc, const char *sdp, const char *type, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	printf("Description %d:\n%s\n", peer == peer1 ? 1 : 2, sdp);
 	Peer *other = peer == peer1 ? peer2 : peer1;
 	rtcSetRemoteDescription(other->pc, sdp, type);
 }
 
-static void candidateCallback(const char *cand, const char *mid, void *ptr) {
+static void RTC_API candidateCallback(int pc, const char *cand, const char *mid, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	printf("Candidate %d: %s\n", peer == peer1 ? 1 : 2, cand);
 	Peer *other = peer == peer1 ? peer2 : peer1;
 	rtcAddRemoteCandidate(other->pc, cand, mid);
 }
 
-static void stateChangeCallback(rtcState state, void *ptr) {
+static void RTC_API stateChangeCallback(int pc, rtcState state, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	peer->state = state;
 	printf("State %d: %d\n", peer == peer1 ? 1 : 2, (int)state);
 }
 
-static void gatheringStateCallback(rtcGatheringState state, void *ptr) {
+static void RTC_API gatheringStateCallback(int pc, rtcGatheringState state, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	peer->gatheringState = state;
 	printf("Gathering state %d: %d\n", peer == peer1 ? 1 : 2, (int)state);
 }
 
-static void openCallback(void *ptr) {
+static void RTC_API openCallback(int id, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	peer->connected = true;
 	printf("Track %d: Open\n", peer == peer1 ? 1 : 2);
 }
 
-static void closedCallback(void *ptr) {
+static void RTC_API closedCallback(int id, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	peer->connected = false;
 }
 
-static void trackCallback(int tr, void *ptr) {
+static void RTC_API trackCallback(int pc, int tr, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	peer->tr = tr;
 	peer->connected = true;
@@ -156,7 +156,7 @@ int test_capi_track_main() {
 	rtcSetClosedCallback(peer1->tr, closedCallback);
 
 	// Initiate the handshake
-	rtcSetLocalDescription(peer1->pc);
+	rtcSetLocalDescription(peer1->pc, NULL);
 
 	attempts = 10;
 	while ((!peer2->connected || !peer1->connected) && attempts--)
@@ -179,7 +179,7 @@ int test_capi_track_main() {
 
 	// You may call rtcCleanup() when finished to free static resources
 	rtcCleanup();
-	sleep(2);
+	sleep(1);
 
 	printf("Success\n");
 	return 0;

test/connectivity.cpp

@@ -69,6 +69,10 @@ void test_connectivity() {
 		cout << "Gathering state 1: " << state << endl;
 	});
 
+	pc1->onSignalingStateChange([](PeerConnection::SignalingState state) {
+		cout << "Signaling state 1: " << state << endl;
+	});
+
 	pc2->onLocalDescription([wpc1 = make_weak_ptr(pc1)](Description sdp) {
 		auto pc1 = wpc1.lock();
 		if (!pc1)
@@ -91,6 +95,10 @@ void test_connectivity() {
 		cout << "Gathering state 2: " << state << endl;
 	});
 
+	pc2->onSignalingStateChange([](PeerConnection::SignalingState state) {
+		cout << "Signaling state 2: " << state << endl;
+	});
+
 	shared_ptr<DataChannel> dc2;
 	pc2->onDataChannel([&dc2](shared_ptr<DataChannel> dc) {
 		cout << "DataChannel 2: Received with label \"" << dc->label() << "\"" << endl;
@@ -147,6 +155,16 @@ void test_connectivity() {
 	if (auto addr = pc2->remoteAddress())
 		cout << "Remote address 2: " << *addr << endl;
 
+	Candidate local, remote;
+	if (pc1->getSelectedCandidatePair(&local, &remote)) {
+		cout << "Local candidate 1:  " << local << endl;
+		cout << "Remote candidate 1: " << remote << endl;
+	}
+	if (pc2->getSelectedCandidatePair(&local, &remote)) {
+		cout << "Local candidate 2:  " << local << endl;
+		cout << "Remote candidate 2: " << remote << endl;
+	}
+
 	// Try to open a second data channel with another label
 	shared_ptr<DataChannel> second2;
 	pc2->onDataChannel([&second2](shared_ptr<DataChannel> dc) {
@@ -190,6 +208,37 @@ void test_connectivity() {
 	    attempts--)
 		this_thread::sleep_for(1s);
 
+	if (!asecond2 || !asecond2->isOpen() || !second1->isOpen())
+		throw runtime_error("Second DataChannel is not open");
+
+	// Try to open a negotiated channel
+	DataChannelInit init;
+	init.negotiated = true;
+	init.id = 42;
+	auto negotiated1 = pc1->createDataChannel("negotiated", init);
+	auto negotiated2 = pc2->createDataChannel("negoctated", init);
+
+	if (!negotiated1->isOpen() || !negotiated2->isOpen())
+		throw runtime_error("Negociated DataChannel is not open");
+
+	std::atomic<bool> received = false;
+	negotiated2->onMessage([&received](const variant<binary, string> &message) {
+		if (holds_alternative<string>(message)) {
+			cout << "Second Message 2: " << get<string>(message) << endl;
+			received = true;
+		}
+	});
+
+	negotiated1->send("Hello from negotiated channel");
+
+	// Wait a bit
+	attempts = 5;
+	while (!received && attempts--)
+		this_thread::sleep_for(1s);
+
+	if (!received)
+		throw runtime_error("Negociated DataChannel failed");
+
 	// Delay close of peer 2 to check closing works properly
 	pc1->close();
 	this_thread::sleep_for(1s);
@@ -198,7 +247,7 @@ void test_connectivity() {
 
 	// You may call rtc::Cleanup() when finished to free static resources
 	rtc::Cleanup();
-	this_thread::sleep_for(2s);
+	this_thread::sleep_for(1s);
 
 	cout << "Success" << endl;
 }

test/main.cpp

@@ -50,6 +50,7 @@ int main(int argc, char **argv) {
 		cerr << "WebRTC connectivity test failed: " << e.what() << endl;
 		return -1;
 	}
+	this_thread::sleep_for(1s);
 	try {
 		cout << endl << "*** Running WebRTC C API connectivity test..." << endl;
 		test_capi_connectivity();
@@ -59,6 +60,7 @@ int main(int argc, char **argv) {
 		return -1;
 	}
 #if RTC_ENABLE_MEDIA
+	this_thread::sleep_for(1s);
 	try {
 		cout << endl << "*** Running WebRTC Track test..." << endl;
 		test_track();
@@ -77,6 +79,7 @@ int main(int argc, char **argv) {
 	}
 #endif
 #if RTC_ENABLE_WEBSOCKET
+	this_thread::sleep_for(1s);
 	try {
 		cout << endl << "*** Running WebSocket test..." << endl;
 		test_websocket();
@@ -86,6 +89,7 @@ int main(int argc, char **argv) {
 		return -1;
 	}
 #endif
+	this_thread::sleep_for(1s);
 	try {
 		cout << endl << "*** Running WebRTC benchmark..." << endl;
 		test_benchmark();

test/track.cpp

@@ -92,9 +92,10 @@ void test_track() {
 	});
 
 	shared_ptr<Track> t2;
-	pc2->onTrack([&t2](shared_ptr<Track> t) {
+	string newTrackMid;
+	pc2->onTrack([&t2, &newTrackMid](shared_ptr<Track> t) {
 		cout << "Track 2: Received with mid \"" << t->mid() << "\"" << endl;
-		if (t->mid() != "test") {
+		if (t->mid() != newTrackMid) {
 			cerr << "Wrong track mid" << endl;
 			return;
 		}
@@ -102,7 +103,9 @@ void test_track() {
 		std::atomic_store(&t2, t);
 	});
 
-	auto t1 = pc1->addTrack(Description::Video("test"));
+	// Test opening a track
+	newTrackMid = "test";
+	auto t1 = pc1->addTrack(Description::Video(newTrackMid));
 
 	pc1->setLocalDescription();
 
@@ -118,6 +121,20 @@ void test_track() {
 	if (!at2 || !at2->isOpen() || !t1->isOpen())
 		throw runtime_error("Track is not open");
 
+	// Test renegotiation
+	newTrackMid = "added";
+	t1 = pc1->addTrack(Description::Video(newTrackMid));
+
+	pc1->setLocalDescription();
+
+	attempts = 10;
+	t2.reset();
+	while ((!(at2 = std::atomic_load(&t2)) || !at2->isOpen() || !t1->isOpen()) && attempts--)
+		this_thread::sleep_for(1s);
+
+	if (!at2 || !at2->isOpen() || !t1->isOpen())
+		throw runtime_error("Renegotiated track is not open");
+
 	// TODO: Test sending RTP packets in track
 
 	// Delay close of peer 2 to check closing works properly
@@ -128,7 +145,7 @@ void test_track() {
 
 	// You may call rtc::Cleanup() when finished to free static resources
 	rtc::Cleanup();
-	this_thread::sleep_for(2s);
+	this_thread::sleep_for(1s);
 
 	cout << "Success" << endl;
 }

test/websocket.cpp

@@ -20,11 +20,11 @@
 
 #if RTC_ENABLE_WEBSOCKET
 
+#include <atomic>
 #include <chrono>
 #include <iostream>
 #include <memory>
 #include <thread>
-#include <atomic>
 
 using namespace rtc;
 using namespace std;
@@ -56,14 +56,14 @@ void test_websocket() {
 	ws->onMessage([&received, &myMessage](variant<binary, string> message) {
 		if (holds_alternative<string>(message)) {
 			string str = std::move(get<string>(message));
-			if((received = (str == myMessage)))
+			if ((received = (str == myMessage)))
 				cout << "WebSocket: Received expected message" << endl;
 			else
 				cout << "WebSocket: Received UNEXPECTED message" << endl;
 		}
 	});
 
-	ws->open("wss://echo.websocket.org/");
+	ws->open("wss://echo.websocket.org:443/");
 
 	int attempts = 10;
 	while ((!ws->isOpen() || !received) && attempts--)
@@ -72,11 +72,11 @@ void test_websocket() {
 	if (!ws->isOpen())
 		throw runtime_error("WebSocket is not open");
 
-	if(!received)
+	if (!received)
 		throw runtime_error("Expected message not received");
 
 	ws->close();
-	this_thread::sleep_for(2s);
+	this_thread::sleep_for(1s);
 
 	// You may call rtc::Cleanup() when finished to free static resources
 	rtc::Cleanup();
@@ -86,4 +86,3 @@ void test_websocket() {
 }
 
 #endif
-