Bumped version to 0.11.4

Update usrsctp and mitigate possible data race

.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

.gitignore

@@ -5,6 +5,7 @@ node_modules/
 *.a
 *.so
 compile_commands.json
-tests
+/tests
 .DS_Store
+.idea
 

.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 0.9.2
+	VERSION 0.11.4
 	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)
@@ -19,13 +23,17 @@ 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)
 set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/Modules)
+set(BUILD_SHARED_LIBS OFF) # to force usrsctp to be built static
 
 if(WIN32)
 	add_definitions(-DWIN32_LEAN_AND_MEAN)
@@ -50,13 +58,39 @@ set(LIBDATACHANNEL_SOURCES
 	${CMAKE_CURRENT_SOURCE_DIR}/src/log.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/message.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/peerconnection.cpp
-	${CMAKE_CURRENT_SOURCE_DIR}/src/rtcp.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/logcounter.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/rtcpreceivingsession.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/sctptransport.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/threadpool.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/tls.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/track.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/processor.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/capi.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/rtppacketizationconfig.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/rtcpsrreporter.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/rtppacketizer.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/opusrtppacketizer.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/opuspacketizationhandler.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/h264rtppacketizer.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/nalunit.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/h264packetizationhandler.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/mediachainablehandler.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/mediahandlerelement.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/mediahandlerrootelement.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/rtcpnackresponder.cpp
+)
+
+set(LIBDATACHANNEL_PRIVATE_HEADERS
+	${CMAKE_CURRENT_SOURCE_DIR}/src/certificate.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/dtlssrtptransport.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/dtlstransport.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/icetransport.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/logcounter.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/sctptransport.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/threadpool.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/tls.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/processor.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/transport.hpp
 )
 
 set(LIBDATACHANNEL_WEBSOCKET_SOURCES
@@ -68,6 +102,14 @@ set(LIBDATACHANNEL_WEBSOCKET_SOURCES
 	${CMAKE_CURRENT_SOURCE_DIR}/src/wstransport.cpp
 )
 
+set(LIBDATACHANNEL_WEBSOCKET_PRIVATE_HEADERS
+	${CMAKE_CURRENT_SOURCE_DIR}/src/base64.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/tcptransport.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/tlstransport.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/verifiedtlstransport.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/wstransport.hpp
+)
+
 set(LIBDATACHANNEL_HEADERS
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/candidate.hpp
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/channel.hpp
@@ -75,7 +117,8 @@ set(LIBDATACHANNEL_HEADERS
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/configuration.hpp
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/datachannel.hpp
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/description.hpp
-	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/rtcp.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/mediahandler.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/rtcpreceivingsession.hpp
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/include.hpp
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/init.hpp
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/log.hpp
@@ -85,13 +128,27 @@ 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
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/rtppacketizationconfig.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/rtcpsrreporter.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/rtppacketizer.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/opusrtppacketizer.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/opuspacketizationhandler.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/h264rtppacketizer.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/nalunit.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/h264packetizationhandler.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/mediachainablehandler.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/mediahandlerelement.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/mediahandlerrootelement.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/rtcpnackresponder.hpp
 )
 
 set(TESTS_SOURCES
     ${CMAKE_CURRENT_SOURCE_DIR}/test/main.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/test/connectivity.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/test/turn_connectivity.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/test/track.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/test/capi_connectivity.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/test/capi_track.cpp
@@ -99,6 +156,24 @@ set(TESTS_SOURCES
     ${CMAKE_CURRENT_SOURCE_DIR}/test/benchmark.cpp
 )
 
+set(TESTS_UWP_RESOURCES
+	${CMAKE_CURRENT_SOURCE_DIR}/test/uwp/tests/Logo.png
+	${CMAKE_CURRENT_SOURCE_DIR}/test/uwp/tests/package.appxManifest
+	${CMAKE_CURRENT_SOURCE_DIR}/test/uwp/tests/SmallLogo.png
+	${CMAKE_CURRENT_SOURCE_DIR}/test/uwp/tests/SmallLogo44x44.png
+	${CMAKE_CURRENT_SOURCE_DIR}/test/uwp/tests/SplashScreen.png
+	${CMAKE_CURRENT_SOURCE_DIR}/test/uwp/tests/StoreLogo.png
+	${CMAKE_CURRENT_SOURCE_DIR}/test/uwp/tests/Windows_TemporaryKey.pfx)
+
+set(BENCHMARK_UWP_RESOURCES
+	${CMAKE_CURRENT_SOURCE_DIR}/test/uwp/benchmark/Logo.png
+	${CMAKE_CURRENT_SOURCE_DIR}/test/uwp/benchmark/package.appxManifest
+	${CMAKE_CURRENT_SOURCE_DIR}/test/uwp/benchmark/SmallLogo.png
+	${CMAKE_CURRENT_SOURCE_DIR}/test/uwp/benchmark/SmallLogo44x44.png
+	${CMAKE_CURRENT_SOURCE_DIR}/test/uwp/benchmark/SplashScreen.png
+	${CMAKE_CURRENT_SOURCE_DIR}/test/uwp/benchmark/StoreLogo.png
+	${CMAKE_CURRENT_SOURCE_DIR}/test/uwp/benchmark/Windows_TemporaryKey.pfx)
+
 set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
 set(THREADS_PREFER_PTHREAD_FLAG TRUE)
 find_package(Threads REQUIRED)
@@ -107,32 +182,40 @@ 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
-		${LIBDATACHANNEL_SOURCES})
+		${LIBDATACHANNEL_SOURCES}
+		${LIBDATACHANNEL_PRIVATE_HEADERS}
+		${LIBDATACHANNEL_HEADERS})
 	add_library(datachannel-static STATIC EXCLUDE_FROM_ALL
-		${LIBDATACHANNEL_SOURCES})
+		${LIBDATACHANNEL_SOURCES}
+		${LIBDATACHANNEL_PRIVATE_HEADERS}
+		${LIBDATACHANNEL_HEADERS})
 	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_WEBSOCKET=0)
 	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_WEBSOCKET=0)
 else()
 	add_library(datachannel SHARED
 		${LIBDATACHANNEL_SOURCES}
-		${LIBDATACHANNEL_WEBSOCKET_SOURCES})
+		${LIBDATACHANNEL_PRIVATE_HEADERS}
+		${LIBDATACHANNEL_WEBSOCKET_SOURCES}
+		${LIBDATACHANNEL_WEBSOCKET_PRIVATE_HEADERS}
+		${LIBDATACHANNEL_HEADERS})
 	add_library(datachannel-static STATIC EXCLUDE_FROM_ALL
 		${LIBDATACHANNEL_SOURCES}
-		${LIBDATACHANNEL_WEBSOCKET_SOURCES})
+		${LIBDATACHANNEL_PRIVATE_HEADERS}
+		${LIBDATACHANNEL_WEBSOCKET_SOURCES}
+		${LIBDATACHANNEL_WEBSOCKET_PRIVATE_HEADERS}
+		${LIBDATACHANNEL_HEADERS})
 	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_WEBSOCKET=1)
 	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_WEBSOCKET=1)
 endif()
@@ -148,21 +231,27 @@ 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(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
@@ -170,15 +259,17 @@ if(SRTP_FOUND)
 				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_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()
-	message(STATUS "LibSRTP NOT found, compiling WITHOUT media transport")
-	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_MEDIA=0)
-	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_MEDIA=0)
+		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 +308,16 @@ 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)
 
@@ -240,39 +341,45 @@ endif()
 
 # Tests
 if(NOT NO_TESTS)
+	if(CMAKE_SYSTEM_NAME STREQUAL "WindowsStore")
+		# Add resource files needed for UWP apps.
+		add_executable(datachannel-tests ${TESTS_SOURCES} ${TESTS_UWP_RESOURCES})
+	else()
 		add_executable(datachannel-tests ${TESTS_SOURCES})
+	endif()
 	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)
-	endif()
 
 	# Benchmark
+	if(CMAKE_SYSTEM_NAME STREQUAL "WindowsStore")
+		# Add resource files needed for UWP apps.
+		add_executable(datachannel-benchmark test/benchmark.cpp ${BENCHMARK_UWP_RESOURCES})
+	else()
 		add_executable(datachannel-benchmark test/benchmark.cpp)
+	endif()
 	set_target_properties(datachannel-benchmark PROPERTIES
 		VERSION ${PROJECT_VERSION}
 		CXX_STANDARD 17)
 	set_target_properties(datachannel-benchmark PROPERTIES OUTPUT_NAME benchmark)
 	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()
-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)
+if(NOT NO_MEDIA)
 	add_subdirectory(examples/media)
+	add_subdirectory(examples/sfu-media)
+    add_subdirectory(examples/streamer)
+endif()
 	add_subdirectory(examples/copy-paste)
 	add_subdirectory(examples/copy-paste-capi)
 endif()

Jamfile

@@ -15,9 +15,9 @@ lib libdatachannel
 	: # requirements
 	<cxxstd>17
 	<include>./include/rtc
-	<define>USE_NICE=0
 	<define>RTC_ENABLE_MEDIA=0
 	<define>RTC_ENABLE_WEBSOCKET=0
+	<define>USE_NICE=0
 	<toolset>msvc:<define>WIN32_LEAN_AND_MEAN
 	<toolset>msvc:<define>NOMINMAX
 	<toolset>msvc:<define>_CRT_SECURE_NO_WARNINGS
@@ -32,6 +32,8 @@ lib libdatachannel
 	<link>static
 	: # usage requirements
 	<include>./include
+	<define>RTC_ENABLE_MEDIA=0
+	<define>RTC_ENABLE_WEBSOCKET=0
 	<library>/libdatachannel//plog
 	<toolset>gcc:<cxxflags>"-pthread -Wno-pedantic -Wno-unused-parameter -Wno-unused-variable"
 	<toolset>clang:<cxxflags>"-pthread -Wno-pedantic -Wno-unused-parameter -Wno-unused-variable"
@@ -94,7 +96,7 @@ rule make_libusrsctp ( targets * : sources * : properties * )
 }
 actions make_libusrsctp
 {
-    (cd $(CWD)/deps/usrsctp && mkdir -p $(BUILD_DIR) && cd $(BUILD_DIR) && cmake -DCMAKE_BUILD_TYPE=$(VARIANT) -DCMAKE_C_FLAGS="-fPIC -Wno-unknown-warning-option -Wno-format-truncation" .. && make -j2 usrsctp-static)
+    (cd $(CWD)/deps/usrsctp && mkdir -p $(BUILD_DIR) && cd $(BUILD_DIR) && cmake -DCMAKE_BUILD_TYPE=$(VARIANT) -DCMAKE_C_FLAGS="-fPIC -Wno-unknown-warning-option -Wno-format-truncation" -Dsctp_build_shared_lib=0 -Dsctp_build_programs=0 .. && make -j2 usrsctp)
     cp $(CWD)/deps/usrsctp/$(BUILD_DIR)/usrsctplib/libusrsctp.a $(<)
 }
 rule make_libusrsctp_msvc ( targets * : sources * : properties * )
@@ -109,7 +111,7 @@ actions make_libusrsctp_msvc
     cd $(CWD)/deps/usrsctp
     mkdir $(BUILD_DIR)
     cd $(BUILD_DIR)
-    cmake -G "Visual Studio 16 2019" ..
+    cmake -G "Visual Studio 16 2019" -Dsctp_build_shared_lib=0 -Dsctp_build_programs=0 ..
     msbuild usrsctplib.sln /property:Configuration=$(VARIANT)
     cd %OLDD%
     cp $(CWD)/deps/usrsctp/$(BUILD_DIR)/usrsctplib/Release/usrsctp.lib $(<)

Makefile

@@ -10,6 +10,7 @@ LDFLAGS=-pthread
 LIBS=
 LOCALLIBS=libusrsctp.a
 USRSCTP_DIR=deps/usrsctp
+SRTP_DIR=deps/libsrtp
 JUICE_DIR=deps/libjuice
 PLOG_DIR=deps/plog
 
@@ -38,15 +39,22 @@ ifneq ($(USE_GNUTLS), 0)
 endif
 endif
 
-USE_SRTP ?= 0
-ifneq ($(USE_SRTP), 0)
+NO_MEDIA ?= 0
+USE_SYSTEM_SRTP ?= 0
+ifeq ($(NO_MEDIA), 0)
         CPPFLAGS+=-DRTC_ENABLE_MEDIA=1
+ifneq ($(USE_SYSTEM_SRTP), 0)
+        CPPFLAGS+=-DRTC_SYSTEM_SRTP=1
         LIBS+=srtp
+else
+        CPPFLAGS+=-DRTC_SYSTEM_SRTP=0
+		INCLUDES+=-I$(SRTP_DIR)/include
+        LOCALLIBS+=libsrtp2.a
+endif
 else
         CPPFLAGS+=-DRTC_ENABLE_MEDIA=0
 endif
 
-
 NO_WEBSOCKET ?= 0
 ifeq ($(NO_WEBSOCKET), 0)
         CPPFLAGS+=-DRTC_ENABLE_WEBSOCKET=1
@@ -54,8 +62,8 @@ else
         CPPFLAGS+=-DRTC_ENABLE_WEBSOCKET=0
 endif
 
-INCLUDES+=$(shell pkg-config --cflags $(LIBS))
-LDLIBS+=$(LOCALLIBS) $(shell pkg-config --libs $(LIBS))
+INCLUDES+=$(if $(LIBS),$(shell pkg-config --cflags $(LIBS)),)
+LDLIBS+=$(LOCALLIBS) $(if $(LIBS),$(shell pkg-config --libs $(LIBS)),)
 
 SRCS=$(shell printf "%s " src/*.cpp)
 OBJS=$(subst .cpp,.o,$(SRCS))
@@ -73,7 +81,7 @@ test/%.o: test/%.cpp
 
 -include $(subst .cpp,.d,$(SRCS))
 
-$(NAME).a: $(OBJS)
+$(NAME).a: $(LOCALLIBS) $(OBJS)
 	$(AR) crf $@ $(OBJS)
 
 $(NAME).so: $(LOCALLIBS) $(OBJS)
@@ -97,15 +105,22 @@ dist-clean: clean
 	-$(RM) src/*~
 	-$(RM) test/*~
 	-cd $(USRSCTP_DIR) && make clean
+	-cd $(SRTP_DIR) && make clean
 	-cd $(JUICE_DIR) && make clean
 
 libusrsctp.a:
 	cd $(USRSCTP_DIR) && \
 		./bootstrap && \
-		./configure --enable-static --disable-debug CFLAGS="$(CPPFLAGS) -Wno-error=format-truncation" && \
+		./configure --enable-static --disable-debug CFLAGS="-fPIC" && \
 		make
 	cp $(USRSCTP_DIR)/usrsctplib/.libs/libusrsctp.a .
 
+libsrtp2.a:
+	cd $(SRTP_DIR) && \
+		./configure && \
+		make
+	cp $(SRTP_DIR)/libsrtp2.a .
+
 libjuice.a:
 ifneq ($(USE_GNUTLS), 0)
 	cd $(JUICE_DIR) && make USE_NETTLE=1

README.md

@@ -19,17 +19,17 @@ 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))
+- ICE ([RFC8445](https://tools.ietf.org/html/rfc8445)) with STUN ([RFC8489](https://tools.ietf.org/html/rfc8489)) and its extension TURN ([RFC8656](https://tools.ietf.org/html/rfc8656))
 
 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))
-- TURN relaying ([RFC5766](https://tools.ietf.org/html/rfc5766)) with [libnice](https://github.com/libnice/libnice) as ICE backend
+- 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))
 
 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 +53,11 @@ 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
 
@@ -72,7 +73,7 @@ $ git submodule update --init --recursive
 
 The CMake library targets `libdatachannel` and `libdatachannel-static` respectively correspond to the shared and static libraries. The default target will build tests and examples. The option `USE_GNUTLS` allows to switch between OpenSSL (default) and GnuTLS, and the option `USE_NICE` allows to switch between libjuice as submodule (default) and libnice.
 
-On Windows, the DLL resulting from the shared library build only exposes the C API, use the static library for the C++ API.
+If you only need Data Channels, the option `NO_MEDIA` allows to make the library lighter by removing media support. Similarly, `NO_WEBSOCKET` removes WebSocket support.
 
 #### POSIX-compliant operating systems (including Linux and Apple macOS)
 ```bash
@@ -81,6 +82,29 @@ $ 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
@@ -99,6 +123,8 @@ $ nmake
 
 The option `USE_GNUTLS` allows to switch between OpenSSL (default) and GnuTLS, and the option `USE_NICE` allows to switch between libjuice as submodule (default) and libnice.
 
+If you only need Data Channels, the option `NO_MEDIA` removes media support. Similarly, `NO_WEBSOCKET` removes WebSocket support.
+
 ```bash
 $ make USE_GNUTLS=1 USE_NICE=0
 ```
@@ -202,5 +228,6 @@ 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/README.md

@@ -8,6 +8,7 @@ This directory contains different WebRTC clients and compatible WebSocket + JSON
 - [signaling-server-rust](signaling-server-rust) contains a similar signaling server in Rust (see [lerouxrgd/datachannel-rs](https://github.com/lerouxrgd/datachannel-rs) for Rust wrappers)
 
 - [media](media) is a copy/paste demo to send the webcam from your browser into gstreamer.
+- [streamer](streamer) streams h264 and opus samples to web browsers (signaling-server-python is required).
 
 Additionally, it contains two debugging tools for libdatachannel with copy-pasting as signaling:
 - [copy-paste](copy-paste) using the C++ API

examples/client/CMakeLists.txt

@@ -9,14 +9,16 @@ 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)
 
+if(WIN32)
+	add_custom_command(TARGET datachannel-client POST_BUILD
+		COMMAND ${CMAKE_COMMAND} -E copy_if_different
+		"$<TARGET_FILE_DIR:datachannel>/datachannel.dll"
+		$<TARGET_FILE_DIR:datachannel-client>
+	)
+endif()

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
+
 #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;
@@ -45,29 +48,21 @@ 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) {
 			stunServer = "stun:";
@@ -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;
@@ -138,11 +138,7 @@ int main(int argc, char **argv) {
 	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

@@ -43,38 +43,30 @@ 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':
           _n = true;
           break;
@@ -124,11 +116,6 @@ Cmdline::Cmdline (int argc, char *argv[]) // ISO C++17 not allowed: throw (std::
           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/CMakeLists.txt

@@ -13,3 +13,15 @@ set_target_properties(datachannel-copy-paste-capi-answerer PROPERTIES
 	OUTPUT_NAME answerer)
 target_link_libraries(datachannel-copy-paste-capi-answerer datachannel)
 
+if(WIN32)
+	add_custom_command(TARGET datachannel-copy-paste-capi-offerer POST_BUILD
+		COMMAND ${CMAKE_COMMAND} -E copy_if_different
+		"$<TARGET_FILE_DIR:datachannel>/datachannel.dll"
+		$<TARGET_FILE_DIR:datachannel-copy-paste-capi-offerer>
+	)
+	add_custom_command(TARGET datachannel-copy-paste-capi-answerer POST_BUILD
+		COMMAND ${CMAKE_COMMAND} -E copy_if_different
+		"$<TARGET_FILE_DIR:datachannel>/datachannel.dll"
+		$<TARGET_FILE_DIR:datachannel-copy-paste-capi-answerer>
+	)
+endif()

examples/copy-paste-capi/answerer.c

@@ -41,13 +41,13 @@ typedef struct {
 	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);
@@ -88,7 +88,8 @@ int main(int argc, char **argv) {
 	bool exit = false;
 	while (!exit) {
 		printf("\n");
-                printf("***************************************************************************************\n");
+		printf("***********************************************************************************"
+		       "****\n");
 		printf("* 0: Exit /"
 		       " 1: Enter remote description /"
 		       " 2: Enter remote candidate /"
@@ -122,14 +123,12 @@ int main(int argc, char **argv) {
 			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
@@ -138,7 +137,7 @@ int main(int argc, char **argv) {
 			size_t candidate_size = 0;
 
 			if (getline(&candidate, &candidate_size, stdin)) {
-                                rtcAddRemoteCandidate(peer->pc, candidate, "0");
+				rtcAddRemoteCandidate(peer->pc, candidate, NULL);
 				free(candidate);
 
 			} else {
@@ -194,35 +193,32 @@ int main(int argc, char **argv) {
 	return 0;
 }
 
-static void descriptionCallback(const char *sdp, const char *type, void *ptr) {
-        // Peer *peer = (Peer *)ptr;
+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;
+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) {
+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) {
+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) {
+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) {
 	if (size < 0) { // negative size indicates a null-terminated string
 		printf("Message %s: %s\n", "answerer", message);
 	} else {
@@ -230,6 +226,17 @@ static void messageCallback(const char *message, int size, void *ptr) {
 	}
 }
 
+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)
@@ -240,17 +247,6 @@ static void deletePeer(Peer *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);
-}
-
 char *state_print(rtcState state) {
 	char *str = NULL;
 	switch (state) {

examples/copy-paste-capi/offerer.c

@@ -41,13 +41,13 @@ typedef struct {
 	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);
@@ -79,7 +79,7 @@ int main(int argc, char **argv){
 	rtcSetStateChangeCallback(peer->pc, stateChangeCallback);
 	rtcSetGatheringStateChangeCallback(peer->pc, gatheringStateCallback);
 
-        // Since this is the offere, we will create a datachannel
+	// Since we are the offerer, we will create a datachannel
 	peer->dc = rtcCreateDataChannel(peer->pc, "test");
 	rtcSetOpenCallback(peer->dc, openCallback);
 	rtcSetClosedCallback(peer->dc, closedCallback);
@@ -91,7 +91,8 @@ int main(int argc, char **argv){
 	while (!exit) {
 
 		printf("\n");
-                printf("***************************************************************************************\n");
+		printf("***********************************************************************************"
+		       "****\n");
 		printf("* 0: Exit /"
 		       " 1: Enter remote description /"
 		       " 2: Enter remote candidate /"
@@ -119,7 +120,6 @@ int main(int argc, char **argv){
 			// Parse Description
 			printf("[Description]: ");
 
-
 			char *line = NULL;
 			size_t len = 0;
 			size_t read = 0;
@@ -127,14 +127,12 @@ int main(int argc, char **argv){
 			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
@@ -142,7 +140,7 @@ int main(int argc, char **argv){
 			char *candidate = NULL;
 			size_t candidate_size = 0;
 			if (getline(&candidate, &candidate_size, stdin)) {
-                                rtcAddRemoteCandidate(peer->pc, candidate, "0");
+				rtcAddRemoteCandidate(peer->pc, candidate, NULL);
 				free(candidate);
 
 			} else {
@@ -150,7 +148,6 @@ int main(int argc, char **argv){
 				break;
 			}
 
-
 			break;
 		}
 		case 3: {
@@ -199,30 +196,27 @@ int main(int argc, char **argv){
 	return 0;
 }
 
-static void descriptionCallback(const char *sdp, const char *type, void *ptr) {
-        // Peer *peer = (Peer *)ptr;
+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;
+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) {
+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) {
+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) {
+static void RTC_API openCallback(int id, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	peer->connected = true;
 	char buffer[256];
@@ -230,13 +224,12 @@ static void openCallback(void *ptr) {
 		printf("DataChannel %s: Received with label \"%s\"\n", "offerer", buffer);
 }
 
-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) {
-        // Peer *peer = (Peer *)ptr;
+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 {

examples/copy-paste/CMakeLists.txt

@@ -4,19 +4,23 @@ 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()
 
 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()
 
+if(WIN32)
+	add_custom_command(TARGET datachannel-copy-paste-offerer POST_BUILD
+		COMMAND ${CMAKE_COMMAND} -E copy_if_different
+		"$<TARGET_FILE_DIR:datachannel>/datachannel.dll"
+		$<TARGET_FILE_DIR:datachannel-copy-paste-offerer>
+	)
+	add_custom_command(TARGET datachannel-copy-paste-answerer POST_BUILD
+		COMMAND ${CMAKE_COMMAND} -E copy_if_different
+		"$<TARGET_FILE_DIR:datachannel>/datachannel.dll"
+		$<TARGET_FILE_DIR:datachannel-copy-paste-answerer>
+	)
+endif()

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 +4,12 @@ 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)
+	add_custom_command(TARGET datachannel-media POST_BUILD
+		COMMAND ${CMAKE_COMMAND} -E copy_if_different
+		"$<TARGET_FILE_DIR:datachannel>/datachannel.dll"
+		$<TARGET_FILE_DIR:datachannel-media>
+	)
 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 +1,15 @@
+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)
+
+if(WIN32)
+	add_custom_command(TARGET datachannel-sfu-media POST_BUILD
+		COMMAND ${CMAKE_COMMAND} -E copy_if_different
+		"$<TARGET_FILE_DIR:datachannel>/datachannel.dll"
+		$<TARGET_FILE_DIR:datachannel-sfu-media>
+	)
+endif()

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/streamer/ArgParser.cpp

@@ -0,0 +1,75 @@
+/*
+ * libdatachannel streamer example
+ * Copyright (c) 2020 Filip Klembara (in2core)
+ *
+ * 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/>.
+ */
+
+#include "ArgParser.hpp"
+#include <iostream>
+
+ArgParser::ArgParser(std::vector<std::pair<std::string, std::string>> options, std::vector<std::pair<std::string, std::string>> flags) {
+    for(auto option: options) {
+        this->options.insert(option.first);
+        this->options.insert(option.second);
+        shortToLongMap.emplace(option.first, option.second);
+        shortToLongMap.emplace(option.second, option.second);
+    }
+    for(auto flag: flags) {
+        this->flags.insert(flag.first);
+        this->flags.insert(flag.second);
+        shortToLongMap.emplace(flag.first, flag.second);
+        shortToLongMap.emplace(flag.second, flag.second);
+    }
+}
+
+std::optional<std::string> ArgParser::toKey(std::string prefixedKey) {
+    if (prefixedKey.find("--") == 0) {
+        return prefixedKey.substr(2, prefixedKey.length());
+    } else if (prefixedKey.find("-") == 0) {
+        return prefixedKey.substr(1, prefixedKey.length());
+    } else {
+        return std::nullopt;
+    }
+}
+
+bool ArgParser::parse(int argc, char **argv, std::function<bool (std::string, std::string)> onOption, std::function<bool (std::string)> onFlag) {
+    std::optional<std::string> currentOption = std::nullopt;
+    for(int i = 1; i < argc; i++) {
+        std::string current = argv[i];
+        auto optKey = toKey(current);
+        if (!currentOption.has_value() && optKey.has_value() && flags.find(optKey.value()) != flags.end()) {
+            auto check = onFlag(shortToLongMap.at(optKey.value()));
+            if (!check) {
+                return false;
+            }
+        } else if (!currentOption.has_value() && optKey.has_value() && options.find(optKey.value()) != options.end()) {
+            currentOption = optKey.value();
+        } else if (currentOption.has_value()) {
+            auto check = onOption(shortToLongMap.at(currentOption.value()), current);
+            if (!check) {
+                return false;
+            }
+            currentOption = std::nullopt;
+        } else {
+            std::cerr << "Unrecognized option " << current << std::endl;
+            return false;
+        }
+    }
+    if (currentOption.has_value()) {
+        std::cerr << "Missing value for " << currentOption.value() << std::endl;
+        return false;
+    }
+    return true;
+}

examples/streamer/ArgParser.hpp

@@ -0,0 +1,41 @@
+/*
+ * libdatachannel streamer example
+ * Copyright (c) 2020 Filip Klembara (in2core)
+ *
+ * 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/>.
+ */
+
+#ifndef ArgParser_hpp
+#define ArgParser_hpp
+
+#include <functional>
+#include <vector>
+#include <utility>
+#include <string>
+#include <set>
+#include <unordered_map>
+#include <optional>
+
+struct ArgParser {
+private:
+    std::set<std::string> options{};
+    std::set<std::string> flags{};
+    std::unordered_map<std::string, std::string> shortToLongMap{};
+public:
+    ArgParser(std::vector<std::pair<std::string, std::string>> options, std::vector<std::pair<std::string, std::string>> flags);
+    std::optional<std::string> toKey(std::string prefixedKey);
+    bool parse(int argc, char **argv, std::function<bool (std::string, std::string)> onOption, std::function<bool (std::string)> onFlag);
+};
+
+#endif /* ArgParser_hpp */

examples/streamer/CMakeLists.txt

@@ -0,0 +1,40 @@
+cmake_minimum_required(VERSION 3.7)
+if(POLICY CMP0079)
+	cmake_policy(SET CMP0079 NEW)
+endif()
+
+add_executable(streamer
+	main.cpp
+	dispatchqueue.cpp
+	dispatchqueue.hpp
+	h264fileparser.cpp
+	h264fileparser.hpp
+	helpers.cpp
+	helpers.hpp
+	opusfileparser.cpp
+	opusfileparser.hpp
+	fileparser.cpp
+	fileparser.hpp
+	stream.cpp
+	stream.hpp
+	ArgParser.cpp
+	ArgParser.hpp
+)
+
+if(WIN32)
+	target_compile_definitions(streamer PUBLIC STATIC_GETOPT)
+endif()
+
+set_target_properties(streamer PROPERTIES
+	CXX_STANDARD 17
+	OUTPUT_NAME streamer)
+
+target_link_libraries(streamer datachannel nlohmann_json)
+
+if(WIN32)
+	add_custom_command(TARGET streamer POST_BUILD
+		COMMAND ${CMAKE_COMMAND} -E copy_if_different
+		"$<TARGET_FILE_DIR:datachannel>/datachannel.dll"
+		$<TARGET_FILE_DIR:streamer>
+	)
+endif()

examples/streamer/README.md

@@ -0,0 +1,32 @@
+# Streaming H264 and opus
+
+This example streams H264 and opus<sup id="a1">[1](#f1)</sup> samples to the connected browser client.
+
+## Starting signaling server
+
+```sh
+$ python3 ../signaling-server-python/signaling-server.py
+```
+
+## Starting php
+
+```sh
+$ php -S 127.0.0.1:8080
+```
+
+Now you can open demo at [127.0.0.1:8080](127.0.0.1:8080).
+
+## Arguments
+
+- `-a` Directory with OPUS samples (default: *../../../../examples/streamer/samples/opus/*).
+- `-b` Directory with H264 samples (default: *../../../../examples/streamer/samples/h264/*).
+- `-d` Signaling server IP address (default: 127.0.0.1).
+- `-p` Signaling server port (default: 8000).
+- `-v` Enable debug logs.
+- `-h` Print this help and exit.
+
+## Generating H264 and Opus samples
+
+You can generate H264 and Opus sample with *samples/generate_h264.py* and *samples/generate_opus.py* respectively. This require ffmpeg, python3 and kaitaistruct library to be installed. Use `-h`/`--help` to learn more about arguments.
+
+<b id="f1">1</b> Opus samples are generated from music downloaded at [bensound](https://www.bensound.com). [↩](#a1)

examples/streamer/client.js

@@ -0,0 +1,207 @@
+/** @type {RTCPeerConnection} */
+let rtc;
+const iceConnectionLog = document.getElementById('ice-connection-state'),
+    iceGatheringLog = document.getElementById('ice-gathering-state'),
+    signalingLog = document.getElementById('signaling-state'),
+    dataChannelLog = document.getElementById('data-channel');
+
+function randomString(len) {
+    const charSet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+    let randomString = '';
+    for (let i = 0; i < len; i++) {
+        const randomPoz = Math.floor(Math.random() * charSet.length);
+        randomString += charSet.substring(randomPoz, randomPoz + 1);
+    }
+    return randomString;
+}
+
+const receiveID = randomString(10);
+const websocket = new WebSocket('ws://127.0.0.1:8000/' + receiveID);
+websocket.onopen = function () {
+    document.getElementById('start').disabled = false;
+}
+
+// data channel
+let dc = null, dcTimeout = null;
+
+function createPeerConnection() {
+    const config = {
+        sdpSemantics: 'unified-plan',
+        bundlePolicy: "max-bundle",
+    };
+
+    if (document.getElementById('use-stun').checked) {
+        config.iceServers = [{urls: ['stun:stun.l.google.com:19302']}];
+    }
+
+    let pc = new RTCPeerConnection(config);
+
+    // register some listeners to help debugging
+    pc.addEventListener('icegatheringstatechange', function () {
+        iceGatheringLog.textContent += ' -> ' + pc.iceGatheringState;
+    }, false);
+    iceGatheringLog.textContent = pc.iceGatheringState;
+
+    pc.addEventListener('iceconnectionstatechange', function () {
+        iceConnectionLog.textContent += ' -> ' + pc.iceConnectionState;
+    }, false);
+    iceConnectionLog.textContent = pc.iceConnectionState;
+
+    pc.addEventListener('signalingstatechange', function () {
+        signalingLog.textContent += ' -> ' + pc.signalingState;
+    }, false);
+    signalingLog.textContent = pc.signalingState;
+
+    // connect audio / video
+    pc.addEventListener('track', function (evt) {
+        document.getElementById('media').style.display = 'block';
+        const videoTag = document.getElementById('video');
+        videoTag.srcObject = evt.streams[0];
+        videoTag.play();
+    });
+
+    let time_start = null;
+
+    function current_stamp() {
+        if (time_start === null) {
+            time_start = new Date().getTime();
+            return 0;
+        } else {
+            return new Date().getTime() - time_start;
+        }
+    }
+
+    pc.ondatachannel = function (event) {
+        dc = event.channel;
+        dc.onopen = function () {
+            dataChannelLog.textContent += '- open\n';
+            dataChannelLog.scrollTop = dataChannelLog.scrollHeight;
+        };
+        dc.onmessage = function (evt) {
+
+            dataChannelLog.textContent += '< ' + evt.data + '\n';
+            dataChannelLog.scrollTop = dataChannelLog.scrollHeight;
+
+            dcTimeout = setTimeout(function () {
+                if (dc == null && dcTimeout != null) {
+                    dcTimeout = null;
+                    return
+                }
+                const message = 'Pong ' + current_stamp();
+                dataChannelLog.textContent += '> ' + message + '\n';
+                dataChannelLog.scrollTop = dataChannelLog.scrollHeight;
+                dc.send(message);
+            }, 1000);
+        }
+        dc.onclose = function () {
+            clearTimeout(dcTimeout);
+            dcTimeout = null;
+            dataChannelLog.textContent += '- close\n';
+            dataChannelLog.scrollTop = dataChannelLog.scrollHeight;
+        };
+    }
+
+    return pc;
+}
+
+function sendAnswer(pc) {
+    return pc.createAnswer()
+        .then((answer) => rtc.setLocalDescription(answer))
+        .then(function () {
+            // wait for ICE gathering to complete
+            return new Promise(function (resolve) {
+                if (pc.iceGatheringState === 'complete') {
+                    resolve();
+                } else {
+                    function checkState() {
+                        if (pc.iceGatheringState === 'complete') {
+                            pc.removeEventListener('icegatheringstatechange', checkState);
+                            resolve();
+                        }
+                    }
+
+                    pc.addEventListener('icegatheringstatechange', checkState);
+                }
+            });
+        }).then(function () {
+            const answer = pc.localDescription;
+
+            document.getElementById('answer-sdp').textContent = answer.sdp;
+
+            return websocket.send(JSON.stringify(
+                {
+                    id: "server",
+                    type: answer.type,
+                    sdp: answer.sdp,
+                }));
+        }).catch(function (e) {
+            alert(e);
+        });
+}
+
+function handleOffer(offer) {
+    rtc = createPeerConnection();
+    return rtc.setRemoteDescription(offer)
+        .then(() => sendAnswer(rtc));
+}
+
+function sendStreamRequest() {
+    websocket.send(JSON.stringify(
+        {
+            id: "server",
+            type: "streamRequest",
+            receiver: receiveID,
+        }));
+}
+
+async function start() {
+    document.getElementById('start').style.display = 'none';
+    document.getElementById('stop').style.display = 'inline-block';
+    document.getElementById('media').style.display = 'block';
+    sendStreamRequest();
+}
+
+function stop() {
+    document.getElementById('stop').style.display = 'none';
+    document.getElementById('media').style.display = 'none';
+    document.getElementById('start').style.display = 'inline-block';
+
+    // close data channel
+    if (dc) {
+        dc.close();
+        dc = null;
+    }
+
+    // close transceivers
+    if (rtc.getTransceivers) {
+        rtc.getTransceivers().forEach(function (transceiver) {
+            if (transceiver.stop) {
+                transceiver.stop();
+            }
+        });
+    }
+
+    // close local audio / video
+    rtc.getSenders().forEach(function (sender) {
+        const track = sender.track;
+        if (track !== null) {
+            sender.track.stop();
+        }
+    });
+
+    // close peer connection
+    setTimeout(function () {
+        rtc.close();
+        rtc = null;
+    }, 500);
+}
+
+
+websocket.onmessage = async function (evt) {
+    const received_msg = evt.data;
+    const object = JSON.parse(received_msg);
+    if (object.type == "offer") {
+        document.getElementById('offer-sdp').textContent = object.sdp;
+        await handleOffer(object)
+    }
+}

examples/streamer/dispatchqueue.cpp

@@ -0,0 +1,94 @@
+/*
+ * libdatachannel streamer example
+ * Copyright (c) 2020 Filip Klembara (in2core)
+ *
+ * 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/>.
+ */
+
+
+#include "dispatchqueue.hpp"
+
+DispatchQueue::DispatchQueue(std::string name, size_t threadCount) :
+    name{std::move(name)}, threads(threadCount) {
+    for(size_t i = 0; i < threads.size(); i++)
+    {
+        threads[i] = std::thread(&DispatchQueue::dispatchThreadHandler, this);
+    }
+}
+
+DispatchQueue::~DispatchQueue() {
+    // Signal to dispatch threads that it's time to wrap up
+    std::unique_lock<std::mutex> lock(lockMutex);
+    quit = true;
+    lock.unlock();
+    condition.notify_all();
+
+    // Wait for threads to finish before we exit
+    for(size_t i = 0; i < threads.size(); i++)
+    {
+        if(threads[i].joinable())
+        {
+            threads[i].join();
+        }
+    }
+}
+
+void DispatchQueue::removePending() {
+    std::unique_lock<std::mutex> lock(lockMutex);
+    queue = {};
+}
+
+void DispatchQueue::dispatch(const fp_t& op) {
+    std::unique_lock<std::mutex> lock(lockMutex);
+    queue.push(op);
+
+    // Manual unlocking is done before notifying, to avoid waking up
+    // the waiting thread only to block again (see notify_one for details)
+    lock.unlock();
+    condition.notify_one();
+}
+
+void DispatchQueue::dispatch(fp_t&& op) {
+    std::unique_lock<std::mutex> lock(lockMutex);
+    queue.push(std::move(op));
+
+    // Manual unlocking is done before notifying, to avoid waking up
+    // the waiting thread only to block again (see notify_one for details)
+    lock.unlock();
+    condition.notify_one();
+}
+
+void DispatchQueue::dispatchThreadHandler(void) {
+    std::unique_lock<std::mutex> lock(lockMutex);
+    do {
+        //Wait until we have data or a quit signal
+        condition.wait(lock, [this]{
+            return (queue.size() || quit);
+        });
+
+        //after wait, we own the lock
+        if(!quit && queue.size())
+        {
+            auto op = std::move(queue.front());
+            queue.pop();
+
+            //unlock now that we're done messing with the queue
+            lock.unlock();
+
+            op();
+
+            lock.lock();
+        }
+    } while (!quit);
+}

examples/streamer/dispatchqueue.hpp

@@ -0,0 +1,59 @@
+/*
+ * libdatachannel streamer example
+ * Copyright (c) 2020 Filip Klembara (in2core)
+ *
+ * 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/>.
+ */
+
+#ifndef dispatchqueue_hpp
+#define dispatchqueue_hpp
+
+#include <thread>
+#include <mutex>
+#include <condition_variable>
+#include <queue>
+#include <functional>
+
+class DispatchQueue {
+    typedef std::function<void(void)> fp_t;
+
+public:
+    DispatchQueue(std::string name, size_t threadCount = 1);
+    ~DispatchQueue();
+
+    // dispatch and copy
+    void dispatch(const fp_t& op);
+    // dispatch and move
+    void dispatch(fp_t&& op);
+
+    void removePending();
+
+    // Deleted operations
+    DispatchQueue(const DispatchQueue& rhs) = delete;
+    DispatchQueue& operator=(const DispatchQueue& rhs) = delete;
+    DispatchQueue(DispatchQueue&& rhs) = delete;
+    DispatchQueue& operator=(DispatchQueue&& rhs) = delete;
+
+private:
+    std::string name;
+    std::mutex lockMutex;
+    std::vector<std::thread> threads;
+    std::queue<fp_t> queue;
+    std::condition_variable condition;
+    bool quit = false;
+
+    void dispatchThreadHandler(void);
+};
+
+#endif /* dispatchqueue_hpp */

examples/streamer/fileparser.cpp

@@ -0,0 +1,59 @@
+/*
+ * libdatachannel streamer example
+ * Copyright (c) 2020 Filip Klembara (in2core)
+ *
+ * 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/>.
+ */
+
+#include "fileparser.hpp"
+#include <fstream>
+
+using namespace std;
+
+FileParser::FileParser(string directory, string extension, uint32_t samplesPerSecond, bool loop): sampleDuration_us(1000 * 1000 / samplesPerSecond), StreamSource() {
+    this->directory = directory;
+    this->extension = extension;
+    this->loop = loop;
+}
+
+void FileParser::start() {
+    sampleTime_us = -sampleDuration_us;
+    loadNextSample();
+}
+
+void FileParser::stop() {
+    StreamSource::stop();
+    counter = -1;
+}
+
+void FileParser::loadNextSample() {
+    string frame_id = to_string(++counter);
+
+    string url = directory + "/sample-" + frame_id + extension;
+    ifstream source(url, ios_base::binary);
+    if (!source) {
+        if (loop && counter > 0) {
+            loopTimestampOffset = sampleTime_us;
+            counter = -1;
+            loadNextSample();
+            return;
+        }
+        sample = {};
+        return;
+    }
+
+    vector<uint8_t> fileContents((std::istreambuf_iterator<char>(source)), std::istreambuf_iterator<char>());
+    sample = *reinterpret_cast<vector<byte> *>(&fileContents);
+    sampleTime_us += sampleDuration_us;
+}

examples/streamer/fileparser.hpp

@@ -0,0 +1,40 @@
+/*
+ * libdatachannel streamer example
+ * Copyright (c) 2020 Filip Klembara (in2core)
+ *
+ * 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/>.
+ */
+
+#ifndef fileparser_hpp
+#define fileparser_hpp
+
+#include <string>
+#include <vector>
+#include "stream.hpp"
+
+class FileParser: public StreamSource {
+    std::string directory;
+    std::string extension;
+    uint32_t counter = -1;
+    bool loop;
+    uint64_t loopTimestampOffset = 0;
+public:
+    const uint64_t sampleDuration_us;
+    virtual void start();
+    virtual void stop();
+    FileParser(std::string directory, std::string extension, uint32_t samplesPerSecond, bool loop);
+    virtual void loadNextSample();
+};
+
+#endif /* fileparser_hpp */

examples/streamer/h264fileparser.cpp

@@ -0,0 +1,70 @@
+/*
+ * libdatachannel streamer example
+ * Copyright (c) 2020 Filip Klembara (in2core)
+ *
+ * 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/>.
+ */
+
+#include "h264fileparser.hpp"
+#include <fstream>
+#include "rtc/rtc.hpp"
+
+using namespace std;
+
+H264FileParser::H264FileParser(string directory, uint32_t fps, bool loop): FileParser(directory, ".h264", fps, loop) { }
+
+void H264FileParser::loadNextSample() {
+    FileParser::loadNextSample();
+
+    unsigned long long i = 0;
+    while (i < sample.size()) {
+        assert(i + 4 < sample.size());
+        auto lengthPtr = (uint32_t *) (sample.data() + i);
+        uint32_t length = ntohl(*lengthPtr);
+        auto naluStartIndex = i + 4;
+        auto naluEndIndex = naluStartIndex + length;
+        assert(naluEndIndex <= sample.size());
+        auto header = reinterpret_cast<rtc::NalUnitHeader *>(sample.data() + naluStartIndex);
+        auto type = header->unitType();
+        switch (type) {
+            case 7:
+                previousUnitType7 = {sample.begin() + i, sample.begin() + naluEndIndex};
+                break;
+            case 8:
+                previousUnitType8 = {sample.begin() + i, sample.begin() + naluEndIndex};;
+                break;
+            case 5:
+                previousUnitType5 = {sample.begin() + i, sample.begin() + naluEndIndex};;
+                break;
+        }
+        i = naluEndIndex;
+    }
+}
+
+vector<byte> H264FileParser::initialNALUS() {
+    vector<byte> units{};
+    if (previousUnitType7.has_value()) {
+        auto nalu = previousUnitType7.value();
+        units.insert(units.end(), nalu.begin(), nalu.end());
+    }
+    if (previousUnitType8.has_value()) {
+        auto nalu = previousUnitType8.value();
+        units.insert(units.end(), nalu.begin(), nalu.end());
+    }
+    if (previousUnitType5.has_value()) {
+        auto nalu = previousUnitType5.value();
+        units.insert(units.end(), nalu.begin(), nalu.end());
+    }
+    return units;
+}

examples/streamer/h264fileparser.hpp

@@ -0,0 +1,36 @@
+/*
+ * libdatachannel streamer example
+ * Copyright (c) 2020 Filip Klembara (in2core)
+ *
+ * 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/>.
+ */
+
+#ifndef h264fileparser_hpp
+#define h264fileparser_hpp
+
+#include "fileparser.hpp"
+#include <optional>
+
+class H264FileParser: public FileParser {
+    std::optional<std::vector<std::byte>> previousUnitType5 = std::nullopt;
+    std::optional<std::vector<std::byte>> previousUnitType7 = std::nullopt;
+    std::optional<std::vector<std::byte>> previousUnitType8 = std::nullopt;
+
+public:
+    H264FileParser(std::string directory, uint32_t fps, bool loop);
+    void loadNextSample() override;
+    std::vector<std::byte> initialNALUS();
+};
+
+#endif /* h264fileparser_hpp */

examples/streamer/helpers.cpp

@@ -0,0 +1,87 @@
+/*
+ * libdatachannel streamer example
+ * Copyright (c) 2020 Filip Klembara (in2core)
+ *
+ * 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/>.
+ */
+
+#include "helpers.hpp"
+#include <ctime>
+
+#if _WIN32
+// taken from https://stackoverflow.com/questions/10905892/equivalent-of-gettimeday-for-windows
+
+#include <Windows.h>
+
+struct timezone {
+    int tz_minuteswest;
+    int tz_dsttime;
+};
+int gettimeofday(struct timeval *tv, struct timezone *tz)
+{
+    if (tv) {
+        FILETIME               filetime; /* 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601 00:00 UTC */
+        ULARGE_INTEGER         x;
+        ULONGLONG              usec;
+        static const ULONGLONG epoch_offset_us = 11644473600000000ULL; /* microseconds betweeen Jan 1,1601 and Jan 1,1970 */
+
+#if _WIN32_WINNT >= _WIN32_WINNT_WIN8
+        GetSystemTimePreciseAsFileTime(&filetime);
+#else
+        GetSystemTimeAsFileTime(&filetime);
+#endif
+        x.LowPart =  filetime.dwLowDateTime;
+        x.HighPart = filetime.dwHighDateTime;
+        usec = x.QuadPart / 10  -  epoch_offset_us;
+        tv->tv_sec  = (time_t)(usec / 1000000ULL);
+        tv->tv_usec = (long)(usec % 1000000ULL);
+    }
+    if (tz) {
+        TIME_ZONE_INFORMATION timezone;
+        GetTimeZoneInformation(&timezone);
+        tz->tz_minuteswest = timezone.Bias;
+        tz->tz_dsttime = 0;
+    }
+    return 0;
+}
+#endif
+
+using namespace std;
+using namespace rtc;
+
+ClientTrackData::ClientTrackData(shared_ptr<Track> track, shared_ptr<RtcpSrReporter> sender) {
+    this->track = track;
+    this->sender = sender;
+}
+
+void Client::setState(State state) {
+    std::unique_lock lock(_mutex);
+    this->state = state;
+}
+
+Client::State Client::getState() {
+    std::shared_lock lock(_mutex);
+    return state;
+}
+
+ClientTrack::ClientTrack(string id, shared_ptr<ClientTrackData> trackData) {
+    this->id = id;
+    this->trackData = trackData;
+}
+
+uint64_t currentTimeInMicroSeconds() {
+    struct timeval time;
+    gettimeofday(&time, NULL);
+    return uint64_t(time.tv_sec) * 1000 * 1000 + time.tv_usec;
+}

examples/streamer/helpers.hpp

@@ -0,0 +1,63 @@
+/*
+ * libdatachannel streamer example
+ * Copyright (c) 2020 Filip Klembara (in2core)
+ *
+ * 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/>.
+ */
+
+#ifndef helpers_hpp
+#define helpers_hpp
+
+#include "rtc/rtc.hpp"
+
+struct ClientTrackData {
+    std::shared_ptr<rtc::Track> track;
+	std::shared_ptr<rtc::RtcpSrReporter> sender;
+
+	ClientTrackData(std::shared_ptr<rtc::Track> track, std::shared_ptr<rtc::RtcpSrReporter> sender);
+};
+
+struct Client {
+    enum class State {
+        Waiting,
+        WaitingForVideo,
+        WaitingForAudio,
+        Ready
+    };
+    const std::shared_ptr<rtc::PeerConnection> & peerConnection = _peerConnection;
+    Client(std::shared_ptr<rtc::PeerConnection> pc) {
+        _peerConnection = pc;
+    }
+    std::optional<std::shared_ptr<ClientTrackData>> video;
+    std::optional<std::shared_ptr<ClientTrackData>> audio;
+    std::optional<std::shared_ptr<rtc::DataChannel>> dataChannel{};
+    void setState(State state);
+    State getState();
+
+private:
+    std::shared_mutex _mutex;
+    State state = State::Waiting;
+    std::string id;
+    std::shared_ptr<rtc::PeerConnection> _peerConnection;
+};
+
+struct ClientTrack {
+    std::string id;
+    std::shared_ptr<ClientTrackData> trackData;
+    ClientTrack(std::string id, std::shared_ptr<ClientTrackData> trackData);
+};
+
+uint64_t currentTimeInMicroSeconds();
+
+#endif /* helpers_hpp */

examples/streamer/index.html

@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>libdatachannel media example</title>
+    <style>
+        button {
+            padding: 8px 16px;
+        }
+
+        pre {
+            overflow-x: hidden;
+            overflow-y: auto;
+        }
+
+        video {
+            width: 100%;
+        }
+
+        .option {
+            margin-bottom: 8px;
+        }
+
+        #media {
+            max-width: 1280px;
+        }
+    </style>
+</head>
+<body>
+<script src="https://webrtc.github.io/adapter/adapter-latest.js"></script>
+
+<h2>Options</h2>
+
+<div class="option">
+    <input id="use-stun" type="checkbox"/>
+    <label for="use-stun">Use STUN server</label>
+</div>
+
+<button id="start" onclick="start()" disabled>Start</button>
+<button id="stop" style="display: none" onclick="stop()">Stop</button>
+
+<h2>State</h2>
+<p>
+    ICE gathering state: <span id="ice-gathering-state"></span>
+</p>
+<p>
+    ICE connection state: <span id="ice-connection-state"></span>
+</p>
+<p>
+    Signaling state: <span id="signaling-state"></span>
+</p>
+
+<div id="media" style="display: none">
+    <h2>Media</h2>
+    <video id="video" autoplay playsinline></video>
+</div>
+
+<h2>Data channel</h2>
+<pre id="data-channel" style="height: 200px;"></pre>
+
+<h2>SDP</h2>
+
+<h3>Offer</h3>
+<pre id="offer-sdp"></pre>
+
+<h3>Answer</h3>
+<pre id="answer-sdp"></pre>
+
+<script src="client.js"></script>
+
+</body>
+</html>

examples/streamer/main.cpp

@@ -0,0 +1,480 @@
+/*
+ * libdatachannel client example
+ * Copyright (c) 2019-2020 Paul-Louis Ageneau
+ * Copyright (c) 2019 Murat Dogan
+ * Copyright (c) 2020 Will Munn
+ * Copyright (c) 2020 Nico Chatzi
+ * Copyright (c) 2020 Lara Mackey
+ * Copyright (c) 2020 Erik Cota-Robles
+ * Copyright (c) 2020 Filip Klembara (in2core)
+ *
+ * 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/>.
+ */
+
+#include "nlohmann/json.hpp"
+
+#include "h264fileparser.hpp"
+#include "opusfileparser.hpp"
+#include "helpers.hpp"
+#include "ArgParser.hpp"
+
+using namespace rtc;
+using namespace std;
+using namespace std::chrono_literals;
+
+using json = nlohmann::json;
+
+template <class T> weak_ptr<T> make_weak_ptr(shared_ptr<T> ptr) { return ptr; }
+
+/// all connected clients
+unordered_map<string, shared_ptr<Client>> clients{};
+
+/// Creates peer connection and client representation
+/// @param config Configuration
+/// @param wws Websocket for signaling
+/// @param id Client ID
+/// @returns Client
+shared_ptr<Client> createPeerConnection(const Configuration &config,
+                                        weak_ptr<WebSocket> wws,
+                                        string id);
+
+/// Creates stream
+/// @param h264Samples Directory with H264 samples
+/// @param fps Video FPS
+/// @param opusSamples Directory with opus samples
+/// @returns Stream object
+shared_ptr<Stream> createStream(const string h264Samples, const unsigned fps, const string opusSamples);
+
+/// Add client to stream
+/// @param client Client
+/// @param adding_video True if adding video
+void addToStream(shared_ptr<Client> client, bool isAddingVideo);
+
+/// Start stream
+void startStream();
+
+/// Main dispatch queue
+DispatchQueue MainThread("Main");
+
+/// Audio and video stream
+optional<shared_ptr<Stream>> avStream = nullopt;
+
+const string defaultRootDirectory = "../../../../examples/streamer/samples/";
+const string defaultH264SamplesDirectory = defaultRootDirectory + "h264/";
+string h264SamplesDirectory = defaultH264SamplesDirectory;
+const string defaultOpusSamplesDirectory = defaultRootDirectory + "opus/";
+string opusSamplesDirectory = defaultOpusSamplesDirectory;
+const string defaultIPAddress = "127.0.0.1";
+const uint16_t defaultPort = 8000;
+string ip_address = defaultIPAddress;
+uint16_t port = defaultPort;
+
+/// Incomming message handler for websocket
+/// @param message Incommint message
+/// @param config Configuration
+/// @param ws Websocket
+void wsOnMessage(json message, Configuration config, shared_ptr<WebSocket> ws) {
+    auto it = message.find("id");
+    if (it == message.end())
+        return;
+    string id = it->get<string>();
+    it = message.find("type");
+    if (it == message.end())
+        return;
+    string type = it->get<string>();
+
+    if (type == "streamRequest") {
+        shared_ptr<Client> c = createPeerConnection(config, make_weak_ptr(ws), id);
+        clients.emplace(id, c);
+    } else if (type == "answer") {
+        shared_ptr<Client> c;
+        if (auto jt = clients.find(id); jt != clients.end()) {
+            auto pc = clients.at(id)->peerConnection;
+            auto sdp = message["sdp"].get<string>();
+            auto description = Description(sdp, type);
+            pc->setRemoteDescription(description);
+        }
+    }
+}
+
+int main(int argc, char **argv) try {
+    bool enableDebugLogs = false;
+    bool printHelp = false;
+    int c = 0;
+    auto parser = ArgParser({{"a", "audio"}, {"b", "video"}, {"d", "ip"}, {"p","port"}}, {{"h", "help"}, {"v", "verbose"}});
+    auto parsingResult = parser.parse(argc, argv, [](string key, string value) {
+        if (key == "audio") {
+            opusSamplesDirectory = value + "/";
+        } else if (key == "video") {
+            h264SamplesDirectory = value + "/";
+        } else if (key == "ip") {
+            ip_address = value;
+        } else if (key == "port") {
+            port = atoi(value.data());
+        } else {
+            cerr << "Invalid option --" << key << " with value " << value << endl;
+            return false;
+        }
+        return true;
+    }, [&enableDebugLogs, &printHelp](string flag){
+        if (flag == "verbose") {
+            enableDebugLogs = true;
+        } else if (flag == "help") {
+            printHelp = true;
+        } else {
+            cerr << "Invalid flag --" << flag << endl;
+            return false;
+        }
+        return true;
+    });
+    if (!parsingResult) {
+        return 1;
+    }
+
+    if (printHelp) {
+        cout << "usage: stream-h264 [-a opus_samples_folder] [-b h264_samples_folder] [-d ip_address] [-p port] [-v] [-h]" << endl
+        << "Arguments:" << endl
+        << "\t -a " << "Directory with opus samples (default: " << defaultOpusSamplesDirectory << ")." << endl
+        << "\t -b " << "Directory with H264 samples (default: " << defaultH264SamplesDirectory << ")." << endl
+        << "\t -d " << "Signaling server IP address (default: " << defaultIPAddress << ")." << endl
+        << "\t -p " << "Signaling server port (default: " << defaultPort << ")." << endl
+        << "\t -v " << "Enable debug logs." << endl
+        << "\t -h " << "Print this help and exit." << endl;
+        return 0;
+    }
+    if (enableDebugLogs) {
+        InitLogger(LogLevel::Debug);
+    }
+
+    Configuration config;
+    string stunServer = "stun:stun.l.google.com:19302";
+    cout << "Stun server is " << stunServer << endl;
+    config.iceServers.emplace_back(stunServer);
+
+
+    string localId = "server";
+    cout << "The local ID is: " << localId << endl;
+
+    auto ws = make_shared<WebSocket>();
+    ws->onOpen([]() { cout << "WebSocket connected, signaling ready" << endl; });
+
+    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;
+
+        json message = json::parse(get<string>(data));
+        MainThread.dispatch([message, config, ws]() {
+            wsOnMessage(message, config, ws);
+        });
+    });
+
+    const string url = "ws://" + ip_address + ":" + to_string(port) + "/" + 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);
+    }
+
+    while (true) {
+        string id;
+        cout << "Enter to exit" << endl;
+        cin >> id;
+        cin.ignore();
+        cout << "exiting" << endl;
+        break;
+    }
+
+    cout << "Cleaning up..." << endl;
+    return 0;
+
+} catch (const std::exception &e) {
+    std::cout << "Error: " << e.what() << std::endl;
+    return -1;
+}
+
+shared_ptr<ClientTrackData> addVideo(const shared_ptr<PeerConnection> pc, const uint8_t payloadType, const uint32_t ssrc, const string cname, const string msid, const function<void (void)> onOpen) {
+    auto video = Description::Video(cname);
+    video.addH264Codec(payloadType);
+    video.addSSRC(ssrc, cname, msid, cname);
+    auto track = pc->addTrack(video);
+    // create RTP configuration
+    auto rtpConfig = shared_ptr<RtpPacketizationConfig>(new RtpPacketizationConfig(ssrc, cname, payloadType, H264RtpPacketizer::defaultClockRate));
+    // create packetizer
+	auto packetizer = shared_ptr<H264RtpPacketizer>(new H264RtpPacketizer(H264RtpPacketizer::Separator::Length, rtpConfig));
+	// create H264 handler
+	shared_ptr<H264PacketizationHandler> h264Handler(new H264PacketizationHandler(packetizer));
+	// add RTCP SR handler
+	auto srReporter = make_shared<RtcpSrReporter>(rtpConfig);
+	h264Handler->addToChain(srReporter);
+	// add RTCP NACK handler
+	auto nackResponder = make_shared<RtcpNackResponder>();
+	h264Handler->addToChain(nackResponder);
+    // set handler
+    track->setRtcpHandler(h264Handler);
+    track->onOpen(onOpen);
+    auto trackData = make_shared<ClientTrackData>(track, srReporter);
+    return trackData;
+}
+
+shared_ptr<ClientTrackData> addAudio(const shared_ptr<PeerConnection> pc, const uint8_t payloadType, const uint32_t ssrc, const string cname, const string msid, const function<void (void)> onOpen) {
+    auto audio = Description::Audio(cname);
+    audio.addOpusCodec(payloadType);
+    audio.addSSRC(ssrc, cname, msid, cname);
+    auto track = pc->addTrack(audio);
+    // create RTP configuration
+    auto rtpConfig = shared_ptr<RtpPacketizationConfig>(new RtpPacketizationConfig(ssrc, cname, payloadType, OpusRtpPacketizer::defaultClockRate));
+    // create packetizer
+    auto packetizer = make_shared<OpusRtpPacketizer>(rtpConfig);
+	// create opus handler
+    auto opusHandler = make_shared<OpusPacketizationHandler>(packetizer);
+	// add RTCP SR handler
+	auto srReporter = make_shared<RtcpSrReporter>(rtpConfig);
+	opusHandler->addToChain(srReporter);
+	// add RTCP NACK handler
+	auto nackResponder = make_shared<RtcpNackResponder>();
+	opusHandler->addToChain(nackResponder);
+    // set handler
+    track->setRtcpHandler(opusHandler);
+    track->onOpen(onOpen);
+    auto trackData = make_shared<ClientTrackData>(track, srReporter);
+    return trackData;
+}
+
+// Create and setup a PeerConnection
+shared_ptr<Client> createPeerConnection(const Configuration &config,
+                                                weak_ptr<WebSocket> wws,
+                                                string id) {
+
+    auto pc = make_shared<PeerConnection>(config);
+    shared_ptr<Client> client(new Client(pc));
+
+    pc->onStateChange([id](PeerConnection::State state) {
+        cout << "State: " << state << endl;
+        if (state == PeerConnection::State::Disconnected ||
+            state == PeerConnection::State::Failed ||
+            state == PeerConnection::State::Closed) {
+            // remove disconnected client
+            MainThread.dispatch([id]() {
+                clients.erase(id);
+            });
+        }
+    });
+
+    pc->onGatheringStateChange(
+        [wpc = make_weak_ptr(pc), id, wws](PeerConnection::GatheringState state) {
+        cout << "Gathering State: " << state << endl;
+        if (state == PeerConnection::GatheringState::Complete) {
+            if(auto pc = wpc.lock()) {
+                auto description = pc->localDescription();
+                json message = {
+                    {"id", id},
+                    {"type", description->typeString()},
+                    {"sdp", string(description.value())}
+                };
+                // Gathering complete, send answer
+                if (auto ws = wws.lock()) {
+                    ws->send(message.dump());
+                }
+            }
+        }
+    });
+
+    client->video = addVideo(pc, 102, 1, "video-stream", "stream1", [id, wc = make_weak_ptr(client)]() {
+        MainThread.dispatch([wc]() {
+            if (auto c = wc.lock()) {
+                addToStream(c, true);
+            }
+        });
+        cout << "Video from " << id << " opened" << endl;
+    });
+
+    client->audio = addAudio(pc, 111, 2, "audio-stream", "stream1", [id, wc = make_weak_ptr(client)]() {
+        MainThread.dispatch([wc]() {
+            if (auto c = wc.lock()) {
+                addToStream(c, false);
+            }
+        });
+        cout << "Audio from " << id << " opened" << endl;
+    });
+
+    auto dc = pc->addDataChannel("ping-pong");
+    dc->onOpen([id, wdc = make_weak_ptr(dc)]() {
+        if (auto dc = wdc.lock()) {
+            dc->send("Ping");
+        }
+    });
+
+    dc->onMessage(nullptr, [id, wdc = make_weak_ptr(dc)](string msg) {
+        cout << "Message from " << id << " received: " << msg << endl;
+        if (auto dc = wdc.lock()) {
+            dc->send("Ping");
+        }
+    });
+    client->dataChannel = dc;
+
+    pc->setLocalDescription();
+    return client;
+};
+
+/// Create stream
+shared_ptr<Stream> createStream(const string h264Samples, const unsigned fps, const string opusSamples) {
+    // video source
+    auto video = make_shared<H264FileParser>(h264Samples, fps, true);
+    // audio source
+    auto audio = make_shared<OPUSFileParser>(opusSamples, true);
+
+    auto stream = make_shared<Stream>(video, audio);
+    // set callback responsible for sample sending
+    stream->onSample([ws = make_weak_ptr(stream)](Stream::StreamSourceType type, uint64_t sampleTime, rtc::binary sample) {
+        vector<ClientTrack> tracks{};
+        string streamType = type == Stream::StreamSourceType::Video ? "video" : "audio";
+        // get track for given type
+        function<optional<shared_ptr<ClientTrackData>> (shared_ptr<Client>)> getTrackData = [type](shared_ptr<Client> client) {
+            return type == Stream::StreamSourceType::Video ? client->video : client->audio;
+        };
+        // get all clients with Ready state
+        for(auto id_client: clients) {
+            auto id = id_client.first;
+            auto client = id_client.second;
+            auto optTrackData = getTrackData(client);
+            if (client->getState() == Client::State::Ready && optTrackData.has_value()) {
+                auto trackData = optTrackData.value();
+                tracks.push_back(ClientTrack(id, trackData));
+            }
+        }
+        if (!tracks.empty()) {
+            auto message = make_message(move(sample));
+            for (auto clientTrack: tracks) {
+                auto client = clientTrack.id;
+                auto trackData = clientTrack.trackData;
+                // sample time is in us, we need to convert it to seconds
+                auto elapsedSeconds = double(sampleTime) / (1000 * 1000);
+                auto rtpConfig = trackData->sender->rtpConfig;
+                // get elapsed time in clock rate
+                uint32_t elapsedTimestamp = rtpConfig->secondsToTimestamp(elapsedSeconds);
+
+                // set new timestamp
+                rtpConfig->timestamp = rtpConfig->startTimestamp + elapsedTimestamp;
+
+                // get elapsed time in clock rate from last RTCP sender report
+                auto reportElapsedTimestamp = rtpConfig->timestamp - trackData->sender->previousReportedTimestamp;
+                // check if last report was at least 1 second ago
+                if (rtpConfig->timestampToSeconds(reportElapsedTimestamp) > 1) {
+                    trackData->sender->setNeedsToReport();
+                }
+                cout << "Sending " << streamType << " sample with size: " << to_string(message->size()) << " to " << client << endl;
+                bool send = false;
+                try {
+                    // send sample
+                    send = trackData->track->send(*message);
+                } catch (...) {
+                    send = false;
+                }
+                if (!send) {
+                    cerr << "Unable to send "<< streamType << " packet" << endl;
+                    break;
+                }
+            }
+        }
+        MainThread.dispatch([ws]() {
+            if (clients.empty()) {
+                // we have no clients, stop the stream
+                if (auto stream = ws.lock()) {
+                    stream->stop();
+                }
+            }
+        });
+    });
+    return stream;
+}
+
+/// Start stream
+void startStream() {
+    shared_ptr<Stream> stream;
+    if (avStream.has_value()) {
+        stream = avStream.value();
+        if (stream->isRunning) {
+            // stream is already running
+            return;
+        }
+    } else {
+        stream = createStream(h264SamplesDirectory, 30, opusSamplesDirectory);
+        avStream = stream;
+    }
+    stream->start();
+}
+
+/// Send previous key frame so browser can show something to user
+/// @param stream Stream
+/// @param video Video track data
+void sendInitialNalus(shared_ptr<Stream> stream, shared_ptr<ClientTrackData> video) {
+    auto h264 = dynamic_cast<H264FileParser *>(stream->video.get());
+    auto initialNalus = h264->initialNALUS();
+
+    // send previous NALU key frame so users don't have to wait to see stream works
+    if (!initialNalus.empty()) {
+        const double frameDuration_s = double(h264->sampleDuration_us) / (1000 * 1000);
+        const uint32_t frameTimestampDuration = video->sender->rtpConfig->secondsToTimestamp(frameDuration_s);
+        video->sender->rtpConfig->timestamp = video->sender->rtpConfig->startTimestamp - frameTimestampDuration * 2;
+        video->track->send(initialNalus);
+        video->sender->rtpConfig->timestamp += frameTimestampDuration;
+        // Send initial NAL units again to start stream in firefox browser
+        video->track->send(initialNalus);
+    }
+}
+
+/// Add client to stream
+/// @param client Client
+/// @param adding_video True if adding video
+void addToStream(shared_ptr<Client> client, bool isAddingVideo) {
+    if (client->getState() == Client::State::Waiting) {
+        client->setState(isAddingVideo ? Client::State::WaitingForAudio : Client::State::WaitingForVideo);
+    } else if ((client->getState() == Client::State::WaitingForAudio && !isAddingVideo)
+               || (client->getState() == Client::State::WaitingForVideo && isAddingVideo)) {
+
+        // Audio and video tracks are collected now
+        assert(client->video.has_value() && client->audio.has_value());
+
+        auto video = client->video.value();
+        auto audio = client->audio.value();
+
+        auto currentTime_us = double(currentTimeInMicroSeconds());
+        auto currentTime_s = currentTime_us / (1000 * 1000);
+
+        // set start time of stream
+        video->sender->rtpConfig->setStartTime(currentTime_s, RtpPacketizationConfig::EpochStart::T1970);
+        audio->sender->rtpConfig->setStartTime(currentTime_s, RtpPacketizationConfig::EpochStart::T1970);
+
+        // start stat recording of RTCP SR
+        video->sender->startRecording();
+        audio->sender->startRecording();
+
+        if (avStream.has_value()) {
+            sendInitialNalus(avStream.value(), video);
+        }
+
+        client->setState(Client::State::Ready);
+    }
+    if (client->getState() == Client::State::Ready) {
+        startStream();
+    }
+}

examples/streamer/opusfileparser.cpp

@@ -0,0 +1,23 @@
+/*
+ * libdatachannel streamer example
+ * Copyright (c) 2020 Filip Klembara (in2core)
+ *
+ * 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/>.
+ */
+
+#include "opusfileparser.hpp"
+
+using namespace std;
+
+OPUSFileParser::OPUSFileParser(string directory, bool loop, uint32_t samplesPerSecond): FileParser(directory, ".opus", samplesPerSecond, loop) { }

examples/streamer/opusfileparser.hpp

@@ -0,0 +1,32 @@
+/*
+ * libdatachannel streamer example
+ * Copyright (c) 2020 Filip Klembara (in2core)
+ *
+ * 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/>.
+ */
+
+#ifndef opusfileparser_hpp
+#define opusfileparser_hpp
+
+#include "fileparser.hpp"
+
+class OPUSFileParser: public FileParser {
+    static const uint32_t defaultSamplesPerSecond = 50;
+
+public:
+    OPUSFileParser(std::string directory, bool loop, uint32_t samplesPerSecond = OPUSFileParser::defaultSamplesPerSecond);
+};
+
+
+#endif /* opusfileparser_hpp */

examples/streamer/samples/generate_h264.py

@@ -0,0 +1,115 @@
+#!/usr/bin/env python3
+
+import os
+import getopt
+import sys
+import glob
+from functools import reduce
+from typing import Optional, List
+
+
+class H264ByteStream:
+    @staticmethod
+    def nalu_type(nalu: bytes) -> int:
+        return nalu[0] & 0x1F
+
+    @staticmethod
+    def merge_sample(sample: List[bytes]) -> bytes:
+        result = bytes()
+        for nalu in sample:
+            result += len(nalu).to_bytes(4, byteorder='big') + nalu
+        return result
+
+    @staticmethod
+    def reduce_nalus_to_samples(samples: List[List[bytes]], current: bytes) -> List[List[bytes]]:
+        last_nalus = samples[-1]
+        samples[-1] = last_nalus + [current]
+        if H264ByteStream.nalu_type(current) in [1, 5]:
+            samples.append([])
+        return samples
+
+    def __init__(self, file_name: str):
+        with open(file_name, "rb") as file:
+            byte_stream = file.read()
+            long_split = byte_stream.split(b"\x00\x00\x00\x01")
+            splits = reduce(lambda acc, x: acc + x.split(b"\x00\x00\x01"), long_split, [])
+            nalus = filter(lambda x: len(x) > 0, splits)
+            self.samples = list(
+                filter(lambda x: len(x) > 0, reduce(H264ByteStream.reduce_nalus_to_samples, nalus, [[]])))
+
+
+def generate(input_file: str, output_dir: str, max_samples: Optional[int], fps: Optional[int]):
+    if output_dir[-1] != "/":
+        output_dir += "/"
+    if os.path.isdir(output_dir):
+        files_to_delete = glob.glob(output_dir + "*.h264")
+        if len(files_to_delete) > 0:
+            print("Remove following files?")
+            for file in files_to_delete:
+                print(file)
+            response = input("Remove files? [y/n] ").lower()
+            if response != "y" and response != "yes":
+                print("Cancelling...")
+                return
+            print("Removing files")
+            for file in files_to_delete:
+                os.remove(file)
+    else:
+        os.makedirs(output_dir, exist_ok=True)
+    video_stream_file = "_video_stream.h264"
+    if os.path.isfile(video_stream_file):
+        os.remove(video_stream_file)
+
+    fps_line = "" if fps is None else "-filter:v fps=fps={} ".format(fps)
+    command = 'ffmpeg -i {} -an -vcodec libx264 -preset slow -profile baseline {}{}'.format(input_file, fps_line,
+                                                                                            video_stream_file)
+    os.system(command)
+
+    data = H264ByteStream(video_stream_file)
+    index = 0
+    for sample in data.samples[:max_samples]:
+        name = "{}sample-{}.h264".format(output_dir, index)
+        index += 1
+        with open(name, 'wb') as file:
+            merged_sample = H264ByteStream.merge_sample(sample)
+            file.write(merged_sample)
+    os.remove(video_stream_file)
+
+
+def main(argv):
+    input_file = None
+    default_output_dir = "h264/"
+    output_dir = default_output_dir
+    max_samples = None
+    fps = None
+    try:
+        opts, args = getopt.getopt(argv, "hi:o:m:f:", ["help", "ifile=", "odir=", "max=", "fps"])
+    except getopt.GetoptError:
+        print('generate_h264.py -i <input_files> [-o <output_files>] [-m <max_samples>] [-f <fps>] [-h]')
+        sys.exit(2)
+    for opt, arg in opts:
+        if opt in ("-h", "--help"):
+            print("Usage: generate_h264.py -i <input_files> [-o <output_files>] [-m <max_samples>] [-f <fps>] [-h]")
+            print("Arguments:")
+            print("\t-i,--ifile: Input file")
+            print("\t-o,--odir: Output directory (default: " + default_output_dir + ")")
+            print("\t-m,--max: Maximum generated samples")
+            print("\t-f,--fps: Output fps")
+            print("\t-h,--help: Print this help and exit")
+            sys.exit()
+        elif opt in ("-i", "--ifile"):
+            input_file = arg
+        elif opt in ("-o", "--ofile"):
+            output_dir = arg
+        elif opt in ("-m", "--max"):
+            max_samples = int(arg)
+        elif opt in ("-f", "--fps"):
+            fps = int(arg)
+    if input_file is None:
+        print("Missing argument -i")
+        sys.exit(2)
+    generate(input_file, output_dir, max_samples, fps)
+
+
+if __name__ == "__main__":
+    main(sys.argv[1:])

examples/streamer/samples/generate_opus.py

@@ -0,0 +1,142 @@
+#!/usr/bin/env python3
+
+from kaitaistruct import KaitaiStruct, ValidationNotEqualError
+import os
+import getopt
+import sys
+import glob
+from functools import reduce
+
+
+class Ogg(KaitaiStruct):
+    """Ogg is a popular media container format, which provides basic
+    streaming / buffering mechanisms and is content-agnostic. Most
+    popular codecs that are used within Ogg streams are Vorbis (thus
+    making Ogg/Vorbis streams) and Theora (Ogg/Theora).
+
+    Ogg stream is a sequence Ogg pages. They can be read sequentially,
+    or one can jump into arbitrary stream location and scan for "OggS"
+    sync code to find the beginning of a new Ogg page and continue
+    decoding the stream contents from that one.
+    """
+
+    def __init__(self, _io, _parent=None, _root=None):
+        KaitaiStruct.__init__(self, _io)
+        self._parent = _parent
+        self._root = _root if _root else self
+        self._read()
+
+    def _read(self):
+        self.pages = []
+        i = 0
+        while not self._io.is_eof():
+            self.pages.append(Ogg.Page(self._io, self, self._root))
+            i += 1
+
+    class Page(KaitaiStruct):
+        """Ogg page is a basic unit of data in an Ogg bitstream, usually
+        it's around 4-8 KB, with a maximum size of 65307 bytes.
+        """
+
+        def __init__(self, _io, _parent=None, _root=None):
+            KaitaiStruct.__init__(self, _io)
+            self._parent = _parent
+            self._root = _root if _root else self
+            self._read()
+
+        def _read(self):
+            self.sync_code = self._io.read_bytes(4)
+            if not self.sync_code == b"\x4F\x67\x67\x53":
+                raise ValidationNotEqualError(b"\x4F\x67\x67\x53", self.sync_code, self._io,
+                                              u"/types/page/seq/0")
+            self.version = self._io.read_bytes(1)
+            if not self.version == b"\x00":
+                raise ValidationNotEqualError(b"\x00", self.version, self._io, u"/types/page/seq/1")
+            self.reserved1 = self._io.read_bits_int_be(5)
+            self.is_end_of_stream = self._io.read_bits_int_be(1) != 0
+            self.is_beginning_of_stream = self._io.read_bits_int_be(1) != 0
+            self.is_continuation = self._io.read_bits_int_be(1) != 0
+            self._io.align_to_byte()
+            self.granule_pos = self._io.read_u8le()
+            self.bitstream_serial = self._io.read_u4le()
+            self.page_seq_num = self._io.read_u4le()
+            self.crc32 = self._io.read_u4le()
+            self.num_segments = self._io.read_u1()
+            self.len_segments = [None] * self.num_segments
+            for i in range(self.num_segments):
+                self.len_segments[i] = self._io.read_u1()
+
+            self.segments = [None] * self.num_segments
+            for i in range(self.num_segments):
+                self.segments[i] = self._io.read_bytes(self.len_segments[i])
+
+
+def generate(input_file: str, output_dir: str, max_samples: int):
+    if output_dir[-1] != "/":
+        output_dir += "/"
+    if os.path.isdir(output_dir):
+        files_to_delete = glob.glob(output_dir + "*.opus")
+        if len(files_to_delete) > 0:
+            print("Remove following files?")
+            for file in files_to_delete:
+                print(file)
+            response = input("Remove files? [y/n] ").lower()
+            if response != "y" and response != "yes":
+                print("Cancelling...")
+                return
+            print("Removing files")
+            for file in files_to_delete:
+                os.remove(file)
+    else:
+        os.makedirs(output_dir, exist_ok=True)
+    audio_stream_file = "_audio_stream.ogg"
+    if os.path.isfile(audio_stream_file):
+        os.remove(audio_stream_file)
+    os.system('ffmpeg -i {} -vn -ar 48000 -ac 2 -vbr off -acodec libopus -ab 64k {}'.format(input_file, audio_stream_file))
+
+    data = Ogg.from_file(audio_stream_file)
+    index = 0
+    valid_pages = data.pages[2:]
+    segments = list(reduce(lambda x, y: x + y.segments, valid_pages, []))[:max_samples]
+    for segment in segments:
+        name = "{}sample-{}.opus".format(output_dir, index)
+        index += 1
+        with open(name, 'wb') as file:
+            assert len(list(segment)) == 160
+            file.write(segment)
+    os.remove(audio_stream_file)
+
+
+def main(argv):
+    input_file = None
+    default_output_dir = "opus/"
+    output_dir = default_output_dir
+    max_samples = None
+    try:
+        opts, args = getopt.getopt(argv, "hi:o:m:", ["help", "ifile=", "odir=", "max="])
+    except getopt.GetoptError:
+        print('generate_opus.py -i <input_files> [-o <output_files>] [-m <max_samples>] [-h]')
+        sys.exit(2)
+    for opt, arg in opts:
+        if opt in ("-h", "--help"):
+            print("Usage: generate_opus.py -i <input_files> [-o <output_files>] [-m <max_samples>] [-h]")
+            print("Arguments:")
+            print("\t-i,--ifile: Input file")
+            print("\t-o,--odir: Output directory (default: " + default_output_dir + ")")
+            print("\t-m,--max: Maximum generated samples")
+            print("\t-h,--help: Print this help and exit")
+            sys.exit()
+        elif opt in ("-i", "--ifile"):
+            input_file = arg
+        elif opt in ("-o", "--ofile"):
+            output_dir = arg
+        elif opt in ("-m", "--max"):
+            max_samples = int(arg)
+    if input_file is None:
+        print("Missing argument -i")
+        sys.exit(2)
+    generate(input_file, output_dir, max_samples)
+
+
+if __name__ == "__main__":
+    main(sys.argv[1:])