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include/rtc/description.hpp
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275
include/rtc/description.hpp
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/**
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* Copyright (c) 2019-2020 Paul-Louis Ageneau
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* Copyright (c) 2020 Staz Modrzynski
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef RTC_DESCRIPTION_H
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#define RTC_DESCRIPTION_H
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#include "candidate.hpp"
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#include "common.hpp"
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#include <iostream>
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#include <map>
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#include <vector>
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namespace rtc {
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const string DEFAULT_OPUS_AUDIO_PROFILE =
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"minptime=10;maxaveragebitrate=96000;stereo=1;sprop-stereo=1;useinbandfec=1";
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// Use Constrained Baseline profile Level 4.2 (necessary for Firefox)
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// https://developer.mozilla.org/en-US/docs/Web/Media/Formats/WebRTC_codecs#Supported_video_codecs
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// TODO: Should be 42E0 but 42C0 appears to be more compatible. Investigate this.
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const string DEFAULT_H264_VIDEO_PROFILE =
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"profile-level-id=42e01f;packetization-mode=1;level-asymmetry-allowed=1";
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class RTC_CPP_EXPORT Description {
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public:
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enum class Type { Unspec, Offer, Answer, Pranswer, Rollback };
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enum class Role { ActPass, Passive, Active };
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enum class Direction {
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SendOnly = RTC_DIRECTION_SENDONLY,
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RecvOnly = RTC_DIRECTION_RECVONLY,
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SendRecv = RTC_DIRECTION_SENDRECV,
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Inactive = RTC_DIRECTION_INACTIVE,
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Unknown = RTC_DIRECTION_UNKNOWN
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};
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Description(const string &sdp, Type type = Type::Unspec, Role role = Role::ActPass);
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Description(const string &sdp, string typeString);
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Type type() const;
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string typeString() const;
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Role role() const;
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string bundleMid() const;
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optional<string> iceUfrag() const;
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optional<string> icePwd() const;
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optional<string> fingerprint() const;
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bool ended() const;
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void hintType(Type type);
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void setFingerprint(string fingerprint);
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bool hasCandidate(const Candidate &candidate) const;
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void addCandidate(Candidate candidate);
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void addCandidates(std::vector<Candidate> candidates);
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void endCandidates();
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std::vector<Candidate> extractCandidates();
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operator string() const;
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string generateSdp(string_view eol) const;
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string generateApplicationSdp(string_view eol) const;
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class RTC_CPP_EXPORT Entry {
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public:
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virtual ~Entry() = default;
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virtual string type() const { return mType; }
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virtual string description() const { return mDescription; }
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virtual string mid() const { return mMid; }
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Direction direction() const { return mDirection; }
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void setDirection(Direction dir);
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operator string() const;
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string generateSdp(string_view eol, string_view addr, string_view port) const;
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virtual void parseSdpLine(string_view line);
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std::vector<string>::iterator beginAttributes();
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std::vector<string>::iterator endAttributes();
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std::vector<string>::iterator removeAttribute(std::vector<string>::iterator iterator);
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protected:
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Entry(const string &mline, string mid, Direction dir = Direction::Unknown);
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virtual string generateSdpLines(string_view eol) const;
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std::vector<string> mAttributes;
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private:
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string mType;
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string mDescription;
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string mMid;
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Direction mDirection;
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};
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struct RTC_CPP_EXPORT Application : public Entry {
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public:
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Application(string mid = "data");
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virtual ~Application() = default;
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string description() const override;
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Application reciprocate() const;
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void setSctpPort(uint16_t port) { mSctpPort = port; }
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void hintSctpPort(uint16_t port) { mSctpPort = mSctpPort.value_or(port); }
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void setMaxMessageSize(size_t size) { mMaxMessageSize = size; }
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optional<uint16_t> sctpPort() const { return mSctpPort; }
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optional<size_t> maxMessageSize() const { return mMaxMessageSize; }
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virtual void parseSdpLine(string_view line) override;
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private:
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virtual string generateSdpLines(string_view eol) const override;
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optional<uint16_t> mSctpPort;
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optional<size_t> mMaxMessageSize;
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};
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// Media (non-data)
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class RTC_CPP_EXPORT Media : public Entry {
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public:
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Media(const string &sdp);
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Media(const string &mline, string mid, Direction dir = Direction::SendOnly);
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virtual ~Media() = default;
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string description() const override;
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Media reciprocate() const;
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void removeFormat(const string &fmt);
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void addSSRC(uint32_t ssrc, optional<string> name, optional<string> msid = nullopt,
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optional<string> trackID = nullopt);
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void removeSSRC(uint32_t oldSSRC);
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void replaceSSRC(uint32_t oldSSRC, uint32_t ssrc, optional<string> name,
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optional<string> msid = nullopt, optional<string> trackID = nullopt);
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bool hasSSRC(uint32_t ssrc);
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std::vector<uint32_t> getSSRCs();
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std::optional<std::string> getCNameForSsrc(uint32_t ssrc);
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void setBitrate(int bitrate);
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int getBitrate() const;
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bool hasPayloadType(int payloadType) const;
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void addRTXCodec(unsigned int payloadType, unsigned int originalPayloadType,
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unsigned int clockRate);
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virtual void parseSdpLine(string_view line) override;
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struct RTPMap {
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RTPMap(string_view mline);
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RTPMap() {}
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void removeFB(const string &string);
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void addFB(const string &string);
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void addAttribute(string attr) { fmtps.emplace_back(std::move(attr)); }
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int pt;
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string format;
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int clockRate;
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string encParams;
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std::vector<string> rtcpFbs;
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std::vector<string> fmtps;
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static int parsePT(string_view view);
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void setMLine(string_view view);
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};
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void addRTPMap(const RTPMap &map);
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std::map<int, RTPMap>::iterator beginMaps();
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std::map<int, RTPMap>::iterator endMaps();
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std::map<int, RTPMap>::iterator removeMap(std::map<int, RTPMap>::iterator iterator);
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private:
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virtual string generateSdpLines(string_view eol) const override;
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int mBas = -1;
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Media::RTPMap &getFormat(int fmt);
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Media::RTPMap &getFormat(const string &fmt);
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std::map<int, RTPMap> mRtpMap;
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std::vector<uint32_t> mSsrcs;
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std::map<uint32_t, string> mCNameMap;
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};
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class RTC_CPP_EXPORT Audio : public Media {
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public:
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Audio(string mid = "audio", Direction dir = Direction::SendOnly);
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void addAudioCodec(int payloadType, string codec, optional<string> profile = std::nullopt);
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void addOpusCodec(int payloadType, optional<string> profile = DEFAULT_OPUS_AUDIO_PROFILE);
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};
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class RTC_CPP_EXPORT Video : public Media {
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public:
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Video(string mid = "video", Direction dir = Direction::SendOnly);
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void addVideoCodec(int payloadType, string codec, optional<string> profile = std::nullopt);
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void addH264Codec(int payloadType, optional<string> profile = DEFAULT_H264_VIDEO_PROFILE);
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void addVP8Codec(int payloadType);
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void addVP9Codec(int payloadType);
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};
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bool hasApplication() const;
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bool hasAudioOrVideo() const;
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bool hasMid(string_view mid) const;
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int addMedia(Media media);
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int addMedia(Application application);
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int addApplication(string mid = "data");
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int addVideo(string mid = "video", Direction dir = Direction::SendOnly);
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int addAudio(string mid = "audio", Direction dir = Direction::SendOnly);
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void clearMedia();
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variant<Media *, Application *> media(unsigned int index);
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variant<const Media *, const Application *> media(unsigned int index) const;
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unsigned int mediaCount() const;
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const Application *application() const;
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Application *application();
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static Type stringToType(const string &typeString);
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static string typeToString(Type type);
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private:
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optional<Candidate> defaultCandidate() const;
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shared_ptr<Entry> createEntry(string mline, string mid, Direction dir);
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void removeApplication();
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Type mType;
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// Session-level attributes
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Role mRole;
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string mUsername;
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string mSessionId;
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optional<string> mIceUfrag, mIcePwd;
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optional<string> mFingerprint;
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// Entries
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std::vector<shared_ptr<Entry>> mEntries;
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shared_ptr<Application> mApplication;
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// Candidates
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std::vector<Candidate> mCandidates;
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bool mEnded = false;
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};
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} // namespace rtc
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RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, const rtc::Description &description);
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RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, rtc::Description::Type type);
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RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, rtc::Description::Role role);
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#endif
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