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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
#ifndef _JSEPCODECDESCRIPTION_H_
#define _JSEPCODECDESCRIPTION_H_
#include <cmath>
#include <string>
#include "sdp/SdpMediaSection.h"
#include "sdp/SdpHelper.h"
#include "nsCRT.h"
#include "nsString.h"
#include "mozilla/net/DataChannelProtocol.h"
#include "mozilla/Preferences.h"
namespace mozilla {
#define JSEP_CODEC_CLONE(T) \
virtual JsepCodecDescription* Clone() const override { return new T(*this); }
// A single entry in our list of known codecs.
class JsepCodecDescription {
public:
JsepCodecDescription(const std::string& defaultPt, const std::string& name,
uint32_t clock, uint32_t channels, bool enabled)
: mDefaultPt(defaultPt),
mName(name),
mClock(clock),
mChannels(channels),
mEnabled(enabled),
mStronglyPreferred(false),
mDirection(sdp::kSend) {}
virtual ~JsepCodecDescription() {}
virtual SdpMediaSection::MediaType Type() const = 0;
virtual JsepCodecDescription* Clone() const = 0;
bool GetPtAsInt(uint16_t* ptOutparam) const {
return SdpHelper::GetPtAsInt(mDefaultPt, ptOutparam);
}
// The id used for codec stats, to uniquely identify this codec configuration
// within a transport.
const nsString& StatsId() const {
if (!mStatsId) {
mStatsId.emplace();
mStatsId->AppendPrintf(
"_%s_%s/%s_%u_%u_%s", mDefaultPt.c_str(),
Type() == SdpMediaSection::kVideo ? "video" : "audio", mName.c_str(),
mClock, mChannels, mSdpFmtpLine ? mSdpFmtpLine->c_str() : "nothing");
}
return *mStatsId;
}
virtual bool Matches(const std::string& fmt,
const SdpMediaSection& remoteMsection) const {
// note: fmt here is remote fmt (to go with remoteMsection)
if (Type() != remoteMsection.GetMediaType()) {
return false;
}
const SdpRtpmapAttributeList::Rtpmap* entry(remoteMsection.FindRtpmap(fmt));
if (entry) {
if (!nsCRT::strcasecmp(mName.c_str(), entry->name.c_str()) &&
(mClock == entry->clock) && (mChannels == entry->channels)) {
return ParametersMatch(fmt, remoteMsection);
}
} else if (!fmt.compare("9") && mName == "G722") {
return true;
} else if (!fmt.compare("0") && mName == "PCMU") {
return true;
} else if (!fmt.compare("8") && mName == "PCMA") {
return true;
}
return false;
}
virtual bool ParametersMatch(const std::string& fmt,
const SdpMediaSection& remoteMsection) const {
return true;
}
Maybe<std::string> GetMatchingFormat(
const SdpMediaSection& remoteMsection) const {
for (const auto& fmt : remoteMsection.GetFormats()) {
if (Matches(fmt, remoteMsection)) {
return Some(fmt);
}
}
return Nothing();
}
virtual bool Negotiate(const std::string& pt,
const SdpMediaSection& remoteMsection,
bool remoteIsOffer,
Maybe<const SdpMediaSection&> localMsection) {
// Configuration might change. Invalidate the stats id.
mStatsId = Nothing();
if (mDirection == sdp::kSend || remoteIsOffer) {
mDefaultPt = pt;
}
if (localMsection) {
// Offer/answer is concluding. Update the sdpFmtpLine.
MOZ_ASSERT(mDirection == sdp::kSend || mDirection == sdp::kRecv);
const SdpMediaSection& msection =
mDirection == sdp::kSend ? remoteMsection : *localMsection;
UpdateSdpFmtpLine(ToMaybeRef(msection.FindFmtp(mDefaultPt)));
}
return true;
}
virtual void ApplyConfigToFmtp(
UniquePtr<SdpFmtpAttributeList::Parameters>& aFmtp) const = 0;
virtual void AddToMediaSection(SdpMediaSection& msection) const {
if (mEnabled && msection.GetMediaType() == Type()) {
if (mDirection == sdp::kRecv) {
msection.AddCodec(mDefaultPt, mName, mClock, mChannels);
}
AddParametersToMSection(msection);
}
}
virtual void AddParametersToMSection(SdpMediaSection& msection) const {}
virtual void EnsureNoDuplicatePayloadTypes(std::set<std::string>& aUsedPts) {
mEnabled = EnsurePayloadTypeNotDuplicate(aUsedPts, mDefaultPt);
}
bool EnsurePayloadTypeNotDuplicate(std::set<std::string>& aUsedPts,
std::string& aPtToCheck) {
if (!mEnabled) {
return false;
}
if (!aUsedPts.count(aPtToCheck)) {
aUsedPts.insert(aPtToCheck);
return true;
}
// |codec| cannot use its current payload type. Try to find another.
for (uint16_t freePt = 96; freePt <= 127; ++freePt) {
// Not super efficient, but readability is probably more important.
std::ostringstream os;
os << freePt;
std::string freePtAsString = os.str();
if (!aUsedPts.count(freePtAsString)) {
aUsedPts.insert(freePtAsString);
aPtToCheck = freePtAsString;
return true;
}
}
return false;
}
// of fmtp parameters that have to be (re-)serialized.
void UpdateSdpFmtpLine(
const Maybe<const SdpFmtpAttributeList::Parameters&> aParams) {
mSdpFmtpLine = aParams.map([](const auto& aFmtp) {
std::stringstream ss;
aFmtp.Serialize(ss);
return ss.str();
});
}
std::string mDefaultPt;
std::string mName;
Maybe<std::string> mSdpFmtpLine;
mutable Maybe<nsString> mStatsId;
uint32_t mClock;
uint32_t mChannels;
bool mEnabled;
bool mStronglyPreferred;
sdp::Direction mDirection;
// Will hold constraints from both fmtp and rid
EncodingConstraints mConstraints;
};
class JsepAudioCodecDescription : public JsepCodecDescription {
public:
JsepAudioCodecDescription(const std::string& defaultPt,
const std::string& name, uint32_t clock,
uint32_t channels, bool enabled = true)
: JsepCodecDescription(defaultPt, name, clock, channels, enabled),
mMaxPlaybackRate(0),
mForceMono(false),
mFECEnabled(false),
mDtmfEnabled(false),
mMaxAverageBitrate(0),
mDTXEnabled(false),
mFrameSizeMs(0),
mMinFrameSizeMs(0),
mMaxFrameSizeMs(0),
mCbrEnabled(false) {}
static constexpr SdpMediaSection::MediaType type = SdpMediaSection::kAudio;
SdpMediaSection::MediaType Type() const override { return type; }
JSEP_CODEC_CLONE(JsepAudioCodecDescription)
static UniquePtr<JsepAudioCodecDescription> CreateDefaultOpus() {
// Per jmspeex on IRC:
// For 32KHz sampling, 28 is ok, 32 is good, 40 should be really good
// quality. Note that 1-2Kbps will be wasted on a stereo Opus channel
// with mono input compared to configuring it for mono.
// If we reduce bitrate enough Opus will low-pass us; 16000 will kill a
// 9KHz tone. This should be adaptive when we're at the low-end of video
// bandwidth (say <100Kbps), and if we're audio-only, down to 8 or
// 12Kbps.
return MakeUnique<JsepAudioCodecDescription>("109", "opus", 48000, 2);
}
static UniquePtr<JsepAudioCodecDescription> CreateDefaultG722() {
return MakeUnique<JsepAudioCodecDescription>("9", "G722", 8000, 1);
}
static UniquePtr<JsepAudioCodecDescription> CreateDefaultPCMU() {
return MakeUnique<JsepAudioCodecDescription>("0", "PCMU", 8000, 1);
}
static UniquePtr<JsepAudioCodecDescription> CreateDefaultPCMA() {
return MakeUnique<JsepAudioCodecDescription>("8", "PCMA", 8000, 1);
}
static UniquePtr<JsepAudioCodecDescription> CreateDefaultTelephoneEvent() {
return MakeUnique<JsepAudioCodecDescription>("101", "telephone-event", 8000,
1);
}
SdpFmtpAttributeList::OpusParameters GetOpusParameters(
const std::string& pt, const SdpMediaSection& msection) const {
// Will contain defaults if nothing else
SdpFmtpAttributeList::OpusParameters result;
auto* params = msection.FindFmtp(pt);
if (params && params->codec_type == SdpRtpmapAttributeList::kOpus) {
result =
static_cast<const SdpFmtpAttributeList::OpusParameters&>(*params);
}
return result;
}
SdpFmtpAttributeList::TelephoneEventParameters GetTelephoneEventParameters(
const std::string& pt, const SdpMediaSection& msection) const {
// Will contain defaults if nothing else
SdpFmtpAttributeList::TelephoneEventParameters result;
auto* params = msection.FindFmtp(pt);
if (params &&
params->codec_type == SdpRtpmapAttributeList::kTelephoneEvent) {
result =
static_cast<const SdpFmtpAttributeList::TelephoneEventParameters&>(
*params);
}
return result;
}
void AddParametersToMSection(SdpMediaSection& msection) const override {
if (mDirection == sdp::kSend) {
return;
}
if (mName == "opus") {
UniquePtr<SdpFmtpAttributeList::Parameters> opusParams =
MakeUnique<SdpFmtpAttributeList::OpusParameters>(
GetOpusParameters(mDefaultPt, msection));
ApplyConfigToFmtp(opusParams);
msection.SetFmtp(SdpFmtpAttributeList::Fmtp(mDefaultPt, *opusParams));
} else if (mName == "telephone-event") {
// add the default dtmf tones
SdpFmtpAttributeList::TelephoneEventParameters teParams(
GetTelephoneEventParameters(mDefaultPt, msection));
msection.SetFmtp(SdpFmtpAttributeList::Fmtp(mDefaultPt, teParams));
}
}
bool Negotiate(const std::string& pt, const SdpMediaSection& remoteMsection,
bool remoteIsOffer,
Maybe<const SdpMediaSection&> localMsection) override {
JsepCodecDescription::Negotiate(pt, remoteMsection, remoteIsOffer,
localMsection);
if (mName == "opus" && mDirection == sdp::kSend) {
SdpFmtpAttributeList::OpusParameters opusParams(
GetOpusParameters(mDefaultPt, remoteMsection));
mMaxPlaybackRate = opusParams.maxplaybackrate;
mForceMono = !opusParams.stereo;
// draft-ietf-rtcweb-fec-03.txt section 4.2 says support for FEC
// at the received side is declarative and can be negotiated
// separately for either media direction.
mFECEnabled = opusParams.useInBandFec;
if ((opusParams.maxAverageBitrate >= 6000) &&
(opusParams.maxAverageBitrate <= 510000)) {
mMaxAverageBitrate = opusParams.maxAverageBitrate;
}
mDTXEnabled = opusParams.useDTX;
if (remoteMsection.GetAttributeList().HasAttribute(
SdpAttribute::kPtimeAttribute)) {
mFrameSizeMs = remoteMsection.GetAttributeList().GetPtime();
} else {
mFrameSizeMs = opusParams.frameSizeMs;
}
mMinFrameSizeMs = opusParams.minFrameSizeMs;
if (remoteMsection.GetAttributeList().HasAttribute(
SdpAttribute::kMaxptimeAttribute)) {
mMaxFrameSizeMs = remoteMsection.GetAttributeList().GetMaxptime();
} else {
mMaxFrameSizeMs = opusParams.maxFrameSizeMs;
}
mCbrEnabled = opusParams.useCbr;
}
return true;
}
void ApplyConfigToFmtp(
UniquePtr<SdpFmtpAttributeList::Parameters>& aFmtp) const override {
if (mName == "opus") {
SdpFmtpAttributeList::OpusParameters opusParams;
if (aFmtp) {
MOZ_RELEASE_ASSERT(aFmtp->codec_type == SdpRtpmapAttributeList::kOpus);
opusParams =
static_cast<const SdpFmtpAttributeList::OpusParameters&>(*aFmtp);
opusParams.useInBandFec = mFECEnabled ? 1 : 0;
} else {
// If we weren't passed a fmtp to use then show we can do in band FEC
// for getCapabilities queries.
opusParams.useInBandFec = 1;
}
if (mMaxPlaybackRate) {
opusParams.maxplaybackrate = mMaxPlaybackRate;
}
opusParams.maxAverageBitrate = mMaxAverageBitrate;
if (mChannels == 2 &&
!Preferences::GetBool("media.peerconnection.sdp.disable_stereo_fmtp",
false) &&
!mForceMono) {
// We prefer to receive stereo, if available.
opusParams.stereo = 1;
}
opusParams.useDTX = mDTXEnabled;
opusParams.frameSizeMs = mFrameSizeMs;
opusParams.minFrameSizeMs = mMinFrameSizeMs;
opusParams.maxFrameSizeMs = mMaxFrameSizeMs;
opusParams.useCbr = mCbrEnabled;
aFmtp.reset(opusParams.Clone());
}
};
uint32_t mMaxPlaybackRate;
bool mForceMono;
bool mFECEnabled;
bool mDtmfEnabled;
uint32_t mMaxAverageBitrate;
bool mDTXEnabled;
uint32_t mFrameSizeMs;
uint32_t mMinFrameSizeMs;
uint32_t mMaxFrameSizeMs;
bool mCbrEnabled;
};
class JsepVideoCodecDescription : public JsepCodecDescription {
public:
JsepVideoCodecDescription(const std::string& defaultPt,
const std::string& name, uint32_t clock,
bool enabled = true)
: JsepCodecDescription(defaultPt, name, clock, 0, enabled),
mTmmbrEnabled(false),
mRembEnabled(false),
mFECEnabled(false),
mTransportCCEnabled(false),
mRtxEnabled(false),
mProfileLevelId(0),
mPacketizationMode(0) {
// Add supported rtcp-fb types
mNackFbTypes.push_back("");
mNackFbTypes.push_back(SdpRtcpFbAttributeList::pli);
mCcmFbTypes.push_back(SdpRtcpFbAttributeList::fir);
}
static constexpr SdpMediaSection::MediaType type = SdpMediaSection::kVideo;
SdpMediaSection::MediaType Type() const override { return type; }
static UniquePtr<JsepVideoCodecDescription> CreateDefaultVP8(bool aUseRtx) {
auto codec = MakeUnique<JsepVideoCodecDescription>("120", "VP8", 90000);
// Defaults for mandatory params
codec->mConstraints.maxFs = 12288; // Enough for 2048x1536
codec->mConstraints.maxFps = Some(60);
if (aUseRtx) {
codec->EnableRtx("124");
}
return codec;
}
static UniquePtr<JsepVideoCodecDescription> CreateDefaultVP9(bool aUseRtx) {
auto codec = MakeUnique<JsepVideoCodecDescription>("121", "VP9", 90000);
// Defaults for mandatory params
codec->mConstraints.maxFs = 12288; // Enough for 2048x1536
codec->mConstraints.maxFps = Some(60);
if (aUseRtx) {
codec->EnableRtx("125");
}
return codec;
}
static UniquePtr<JsepVideoCodecDescription> CreateDefaultH264_0(
bool aUseRtx) {
auto codec = MakeUnique<JsepVideoCodecDescription>("97", "H264", 90000);
codec->mPacketizationMode = 0;
// Defaults for mandatory params
codec->mProfileLevelId = 0x42E01F;
if (aUseRtx) {
codec->EnableRtx("98");
}
return codec;
}
static UniquePtr<JsepVideoCodecDescription> CreateDefaultH264_1(
bool aUseRtx) {
auto codec = MakeUnique<JsepVideoCodecDescription>("126", "H264", 90000);
codec->mPacketizationMode = 1;
// Defaults for mandatory params
codec->mProfileLevelId = 0x42E01F;
if (aUseRtx) {
codec->EnableRtx("127");
}
return codec;
}
static UniquePtr<JsepVideoCodecDescription> CreateDefaultUlpFec() {
return MakeUnique<JsepVideoCodecDescription>(
"123", // payload type
"ulpfec", // codec name
90000 // clock rate (match other video codecs)
);
}
static UniquePtr<JsepVideoCodecDescription> CreateDefaultRed() {
auto codec = MakeUnique<JsepVideoCodecDescription>(
"122", // payload type
"red", // codec name
90000 // clock rate (match other video codecs)
);
codec->EnableRtx("119");
return codec;
}
void ApplyConfigToFmtp(
UniquePtr<SdpFmtpAttributeList::Parameters>& aFmtp) const override {
if (mName == "H264") {
SdpFmtpAttributeList::H264Parameters h264Params;
if (aFmtp) {
MOZ_RELEASE_ASSERT(aFmtp->codec_type == SdpRtpmapAttributeList::kH264);
h264Params =
static_cast<const SdpFmtpAttributeList::H264Parameters&>(*aFmtp);
}
if (mDirection == sdp::kSend) {
if (!h264Params.level_asymmetry_allowed) {
// First time the fmtp has been set; set just in case this is for a
// sendonly m-line, since even though we aren't receiving the level
// negotiation still needs to happen (sigh).
h264Params.profile_level_id = mProfileLevelId;
}
} else {
// Parameters that only apply to what we receive
h264Params.max_mbps = mConstraints.maxMbps;
h264Params.max_fs = mConstraints.maxFs;
h264Params.max_cpb = mConstraints.maxCpb;
h264Params.max_dpb = mConstraints.maxDpb;
h264Params.max_br = mConstraints.maxBr;
strncpy(h264Params.sprop_parameter_sets, mSpropParameterSets.c_str(),
sizeof(h264Params.sprop_parameter_sets) - 1);
h264Params.profile_level_id = mProfileLevelId;
}
// Parameters that apply to both the send and recv directions
h264Params.packetization_mode = mPacketizationMode;
// Hard-coded, may need to change someday?
h264Params.level_asymmetry_allowed = true;
// Parameters that apply to both the send and recv directions
h264Params.packetization_mode = mPacketizationMode;
// Hard-coded, may need to change someday?
h264Params.level_asymmetry_allowed = true;
aFmtp.reset(h264Params.Clone());
} else if (mName == "VP8" || mName == "VP9") {
SdpRtpmapAttributeList::CodecType type =
mName == "VP8" ? SdpRtpmapAttributeList::CodecType::kVP8
: SdpRtpmapAttributeList::CodecType::kVP9;
auto vp8Params = SdpFmtpAttributeList::VP8Parameters(type);
if (aFmtp) {
MOZ_RELEASE_ASSERT(aFmtp->codec_type == type);
vp8Params =
static_cast<const SdpFmtpAttributeList::VP8Parameters&>(*aFmtp);
}
// VP8 and VP9 share the same SDP parameters thus far
vp8Params.max_fs = mConstraints.maxFs;
if (mConstraints.maxFps.isSome()) {
vp8Params.max_fr =
static_cast<unsigned int>(std::round(*mConstraints.maxFps));
} else {
vp8Params.max_fr = 60;
}
aFmtp.reset(vp8Params.Clone());
}
}
virtual void EnableTmmbr() {
// EnableTmmbr can be called multiple times due to multiple calls to
// PeerConnectionImpl::ConfigureJsepSessionCodecs
if (!mTmmbrEnabled) {
mTmmbrEnabled = true;
mCcmFbTypes.push_back(SdpRtcpFbAttributeList::tmmbr);
}
}
virtual void EnableRemb() {
// EnableRemb can be called multiple times due to multiple calls to
// PeerConnectionImpl::ConfigureJsepSessionCodecs
if (!mRembEnabled) {
mRembEnabled = true;
mOtherFbTypes.push_back({"", SdpRtcpFbAttributeList::kRemb, "", ""});
}
}
virtual void EnableFec(std::string redPayloadType,
std::string ulpfecPayloadType,
std::string redRtxPayloadType) {
// Enabling FEC for video works a little differently than enabling
// REMB or TMMBR. Support for FEC is indicated by the presence of
// particular codes (red and ulpfec) instead of using rtcpfb
// attributes on a given codec. There is no rtcpfb to push for FEC
// as can be seen above when REMB or TMMBR are enabled.
// Ensure we have valid payload types. This returns zero on failure, which
// is a valid payload type.
uint16_t redPt, ulpfecPt, redRtxPt;
if (!SdpHelper::GetPtAsInt(redPayloadType, &redPt) ||
!SdpHelper::GetPtAsInt(ulpfecPayloadType, &ulpfecPt) ||
!SdpHelper::GetPtAsInt(redRtxPayloadType, &redRtxPt)) {
return;
}
mFECEnabled = true;
mREDPayloadType = redPayloadType;
mULPFECPayloadType = ulpfecPayloadType;
mREDRTXPayloadType = redRtxPayloadType;
}
virtual void EnableTransportCC() {
if (!mTransportCCEnabled) {
mTransportCCEnabled = true;
mOtherFbTypes.push_back(
{"", SdpRtcpFbAttributeList::kTransportCC, "", ""});
}
}
void EnableRtx(const std::string& rtxPayloadType) {
mRtxEnabled = true;
mRtxPayloadType = rtxPayloadType;
}
void AddParametersToMSection(SdpMediaSection& msection) const override {
AddFmtpsToMSection(msection);
AddRtcpFbsToMSection(msection);
}
void AddFmtpsToMSection(SdpMediaSection& msection) const {
if (mName == "H264") {
UniquePtr<SdpFmtpAttributeList::Parameters> h264Params =
MakeUnique<SdpFmtpAttributeList::H264Parameters>(
GetH264Parameters(mDefaultPt, msection));
ApplyConfigToFmtp(h264Params);
msection.SetFmtp(SdpFmtpAttributeList::Fmtp(mDefaultPt, *h264Params));
} else if (mName == "VP8" || mName == "VP9") {
if (mDirection == sdp::kRecv) {
// VP8 and VP9 share the same SDP parameters thus far
UniquePtr<SdpFmtpAttributeList::Parameters> vp8Params =
MakeUnique<SdpFmtpAttributeList::VP8Parameters>(
GetVP8Parameters(mDefaultPt, msection));
ApplyConfigToFmtp(vp8Params);
msection.SetFmtp(SdpFmtpAttributeList::Fmtp(mDefaultPt, *vp8Params));
}
}
if (mRtxEnabled && mDirection == sdp::kRecv) {
SdpFmtpAttributeList::RtxParameters params(
GetRtxParameters(mDefaultPt, msection));
uint16_t apt;
if (SdpHelper::GetPtAsInt(mDefaultPt, &apt)) {
if (apt <= 127) {
msection.AddCodec(mRtxPayloadType, "rtx", mClock, mChannels);
params.apt = apt;
msection.SetFmtp(SdpFmtpAttributeList::Fmtp(mRtxPayloadType, params));
}
}
}
}
void AddRtcpFbsToMSection(SdpMediaSection& msection) const {
SdpRtcpFbAttributeList rtcpfbs(msection.GetRtcpFbs());
for (const auto& rtcpfb : rtcpfbs.mFeedbacks) {
if (rtcpfb.pt == mDefaultPt) {
// Already set by the codec for the other direction.
return;
}
}
for (const std::string& type : mAckFbTypes) {
rtcpfbs.PushEntry(mDefaultPt, SdpRtcpFbAttributeList::kAck, type);
}
for (const std::string& type : mNackFbTypes) {
rtcpfbs.PushEntry(mDefaultPt, SdpRtcpFbAttributeList::kNack, type);
}
for (const std::string& type : mCcmFbTypes) {
rtcpfbs.PushEntry(mDefaultPt, SdpRtcpFbAttributeList::kCcm, type);
}
for (const auto& fb : mOtherFbTypes) {
rtcpfbs.PushEntry(mDefaultPt, fb.type, fb.parameter, fb.extra);
}
msection.SetRtcpFbs(rtcpfbs);
}
SdpFmtpAttributeList::H264Parameters GetH264Parameters(
const std::string& pt, const SdpMediaSection& msection) const {
// Will contain defaults if nothing else
SdpFmtpAttributeList::H264Parameters result;
auto* params = msection.FindFmtp(pt);
if (params && params->codec_type == SdpRtpmapAttributeList::kH264) {
result =
static_cast<const SdpFmtpAttributeList::H264Parameters&>(*params);
}
return result;
}
SdpFmtpAttributeList::RedParameters GetRedParameters(
const std::string& pt, const SdpMediaSection& msection) const {
SdpFmtpAttributeList::RedParameters result;
auto* params = msection.FindFmtp(pt);
if (params && params->codec_type == SdpRtpmapAttributeList::kRed) {
result = static_cast<const SdpFmtpAttributeList::RedParameters&>(*params);
}
return result;
}
SdpFmtpAttributeList::RtxParameters GetRtxParameters(
const std::string& pt, const SdpMediaSection& msection) const {
SdpFmtpAttributeList::RtxParameters result;
const auto* params = msection.FindFmtp(pt);
if (params && params->codec_type == SdpRtpmapAttributeList::kRtx) {
result = static_cast<const SdpFmtpAttributeList::RtxParameters&>(*params);
}
return result;
}
Maybe<std::string> GetRtxPtByApt(const std::string& apt,
const SdpMediaSection& msection) const {
Maybe<std::string> result;
uint16_t aptAsInt;
if (!SdpHelper::GetPtAsInt(apt, &aptAsInt)) {
return result;
}
const SdpAttributeList& attrs = msection.GetAttributeList();
if (attrs.HasAttribute(SdpAttribute::kFmtpAttribute)) {
for (const auto& fmtpAttr : attrs.GetFmtp().mFmtps) {
if (fmtpAttr.parameters) {
auto* params = fmtpAttr.parameters.get();
if (params && params->codec_type == SdpRtpmapAttributeList::kRtx) {
const SdpFmtpAttributeList::RtxParameters* rtxParams =
static_cast<const SdpFmtpAttributeList::RtxParameters*>(params);
if (rtxParams->apt == aptAsInt) {
result = Some(fmtpAttr.format);
break;
}
}
}
}
}
return result;
}
SdpFmtpAttributeList::VP8Parameters GetVP8Parameters(
const std::string& pt, const SdpMediaSection& msection) const {
SdpRtpmapAttributeList::CodecType expectedType(
mName == "VP8" ? SdpRtpmapAttributeList::kVP8
: SdpRtpmapAttributeList::kVP9);
// Will contain defaults if nothing else
SdpFmtpAttributeList::VP8Parameters result(expectedType);
auto* params = msection.FindFmtp(pt);
if (params && params->codec_type == expectedType) {
result = static_cast<const SdpFmtpAttributeList::VP8Parameters&>(*params);
}
return result;
}
void NegotiateRtcpFb(const SdpMediaSection& remoteMsection,
SdpRtcpFbAttributeList::Type type,
std::vector<std::string>* supportedTypes) {
Maybe<std::string> remoteFmt = GetMatchingFormat(remoteMsection);
if (!remoteFmt) {
return;
}
std::vector<std::string> temp;
for (auto& subType : *supportedTypes) {
if (remoteMsection.HasRtcpFb(*remoteFmt, type, subType)) {
temp.push_back(subType);
}
}
*supportedTypes = temp;
}
void NegotiateRtcpFb(
const SdpMediaSection& remoteMsection,
std::vector<SdpRtcpFbAttributeList::Feedback>* supportedFbs) {
Maybe<std::string> remoteFmt = GetMatchingFormat(remoteMsection);
if (!remoteFmt) {
return;
}
std::vector<SdpRtcpFbAttributeList::Feedback> temp;
for (auto& fb : *supportedFbs) {
if (remoteMsection.HasRtcpFb(*remoteFmt, fb.type, fb.parameter)) {
temp.push_back(fb);
}
}
*supportedFbs = temp;
}
void NegotiateRtcpFb(const SdpMediaSection& remote) {
// Removes rtcp-fb types that the other side doesn't support
NegotiateRtcpFb(remote, SdpRtcpFbAttributeList::kAck, &mAckFbTypes);
NegotiateRtcpFb(remote, SdpRtcpFbAttributeList::kNack, &mNackFbTypes);
NegotiateRtcpFb(remote, SdpRtcpFbAttributeList::kCcm, &mCcmFbTypes);
NegotiateRtcpFb(remote, &mOtherFbTypes);
}
virtual bool Negotiate(const std::string& pt,
const SdpMediaSection& remoteMsection,
bool remoteIsOffer,
Maybe<const SdpMediaSection&> localMsection) override {
JsepCodecDescription::Negotiate(pt, remoteMsection, remoteIsOffer,
localMsection);
if (mName == "H264") {
SdpFmtpAttributeList::H264Parameters h264Params(
GetH264Parameters(mDefaultPt, remoteMsection));
// Level is negotiated symmetrically if level asymmetry is disallowed
if (!h264Params.level_asymmetry_allowed) {
SetSaneH264Level(std::min(GetSaneH264Level(h264Params.profile_level_id),
GetSaneH264Level(mProfileLevelId)),
&mProfileLevelId);
}
if (mDirection == sdp::kSend) {
// Remote values of these apply only to the send codec.
mConstraints.maxFs = h264Params.max_fs;
mConstraints.maxMbps = h264Params.max_mbps;
mConstraints.maxCpb = h264Params.max_cpb;
mConstraints.maxDpb = h264Params.max_dpb;
mConstraints.maxBr = h264Params.max_br;
mSpropParameterSets = h264Params.sprop_parameter_sets;
// Only do this if we didn't symmetrically negotiate above
if (h264Params.level_asymmetry_allowed) {
SetSaneH264Level(GetSaneH264Level(h264Params.profile_level_id),
&mProfileLevelId);
}
} else {
}
} else if (mName == "VP8" || mName == "VP9") {
if (mDirection == sdp::kSend) {
SdpFmtpAttributeList::VP8Parameters vp8Params(
GetVP8Parameters(mDefaultPt, remoteMsection));
mConstraints.maxFs = vp8Params.max_fs;
// Right now, we treat max-fr=0 (or the absence of max-fr) as no limit.
if (vp8Params.max_fr) {
mConstraints.maxFps = Some(vp8Params.max_fr);
}
}
}
if (mRtxEnabled && (mDirection == sdp::kSend || remoteIsOffer)) {
Maybe<std::string> rtxPt = GetRtxPtByApt(mDefaultPt, remoteMsection);
if (rtxPt.isSome()) {
EnableRtx(*rtxPt);
} else {
mRtxEnabled = false;
mRtxPayloadType = "";
}
}
NegotiateRtcpFb(remoteMsection);
return true;
}
// Maps the not-so-sane encoding of H264 level into something that is
// ordered in the way one would expect
// 1b is 0xAB, everything else is the level left-shifted one half-byte
// (eg; 1.0 is 0xA0, 1.1 is 0xB0, 3.1 is 0x1F0)
static uint32_t GetSaneH264Level(uint32_t profileLevelId) {
uint32_t profileIdc = (profileLevelId >> 16);
if (profileIdc == 0x42 || profileIdc == 0x4D || profileIdc == 0x58) {
if ((profileLevelId & 0x10FF) == 0x100B) {
// Level 1b
return 0xAB;
}
}
uint32_t level = profileLevelId & 0xFF;
if (level == 0x09) {
// Another way to encode level 1b
return 0xAB;
}
return level << 4;
}
static void SetSaneH264Level(uint32_t level, uint32_t* profileLevelId) {
uint32_t profileIdc = (*profileLevelId >> 16);
uint32_t levelMask = 0xFF;
if (profileIdc == 0x42 || profileIdc == 0x4d || profileIdc == 0x58) {
levelMask = 0x10FF;
if (level == 0xAB) {
// Level 1b
level = 0x100B;
} else {
// Not 1b, just shift
level = level >> 4;
}
} else if (level == 0xAB) {
// Another way to encode 1b
level = 0x09;
} else {
// Not 1b, just shift
level = level >> 4;
}
*profileLevelId = (*profileLevelId & ~levelMask) | level;
}
enum Subprofile {
kH264ConstrainedBaseline,
kH264Baseline,
kH264Main,
kH264Extended,
kH264High,
kH264High10,
kH264High42,
kH264High44,
kH264High10I,
kH264High42I,
kH264High44I,
kH264CALVC44,
kH264UnknownSubprofile
};
static Subprofile GetSubprofile(uint32_t profileLevelId) {
// Based on Table 5 from RFC 6184:
// Profile profile_idc profile-iop
// (hexadecimal) (binary)
// CB 42 (B) x1xx0000
// same as: 4D (M) 1xxx0000
// same as: 58 (E) 11xx0000
// B 42 (B) x0xx0000
// same as: 58 (E) 10xx0000
// M 4D (M) 0x0x0000
// E 58 00xx0000
// H 64 00000000
// H10 6E 00000000
// H42 7A 00000000
// H44 F4 00000000
// H10I 6E 00010000
// H42I 7A 00010000
// H44I F4 00010000
// C44I 2C 00010000
if ((profileLevelId & 0xFF4F00) == 0x424000) {
// 01001111 (mask, 0x4F)
// x1xx0000 (from table)
// 01000000 (expected value, 0x40)
return kH264ConstrainedBaseline;
}
if ((profileLevelId & 0xFF8F00) == 0x4D8000) {
// 10001111 (mask, 0x8F)
// 1xxx0000 (from table)
// 10000000 (expected value, 0x80)
return kH264ConstrainedBaseline;
}
if ((profileLevelId & 0xFFCF00) == 0x58C000) {
// 11001111 (mask, 0xCF)
// 11xx0000 (from table)
// 11000000 (expected value, 0xC0)
return kH264ConstrainedBaseline;
}
if ((profileLevelId & 0xFF4F00) == 0x420000) {
// 01001111 (mask, 0x4F)
// x0xx0000 (from table)
// 00000000 (expected value)
return kH264Baseline;
}
if ((profileLevelId & 0xFFCF00) == 0x588000) {
// 11001111 (mask, 0xCF)
// 10xx0000 (from table)
// 10000000 (expected value, 0x80)
return kH264Baseline;
}
if ((profileLevelId & 0xFFAF00) == 0x4D0000) {
// 10101111 (mask, 0xAF)
// 0x0x0000 (from table)
// 00000000 (expected value)
return kH264Main;
}
if ((profileLevelId & 0xFF0000) == 0x580000) {
// 11001111 (mask, 0xCF)
// 00xx0000 (from table)
// 00000000 (expected value)
return kH264Extended;
}
if ((profileLevelId & 0xFFFF00) == 0x640000) {
return kH264High;
}
if ((profileLevelId & 0xFFFF00) == 0x6E0000) {
return kH264High10;
}
if ((profileLevelId & 0xFFFF00) == 0x7A0000) {
return kH264High42;
}
if ((profileLevelId & 0xFFFF00) == 0xF40000) {
return kH264High44;
}
if ((profileLevelId & 0xFFFF00) == 0x6E1000) {
return kH264High10I;
}
if ((profileLevelId & 0xFFFF00) == 0x7A1000) {
return kH264High42I;
}
if ((profileLevelId & 0xFFFF00) == 0xF41000) {
return kH264High44I;
}
if ((profileLevelId & 0xFFFF00) == 0x2C1000) {
return kH264CALVC44;
}
return kH264UnknownSubprofile;
}
virtual bool ParametersMatch(
const std::string& fmt,
const SdpMediaSection& remoteMsection) const override {
if (mName == "H264") {
SdpFmtpAttributeList::H264Parameters h264Params(
GetH264Parameters(fmt, remoteMsection));
if (h264Params.packetization_mode != mPacketizationMode) {
return false;
}
if (GetSubprofile(h264Params.profile_level_id) !=
GetSubprofile(mProfileLevelId)) {
return false;
}
}
return true;
}
virtual bool RtcpFbRembIsSet() const {
for (const auto& fb : mOtherFbTypes) {
if (fb.type == SdpRtcpFbAttributeList::kRemb) {
return true;
}
}
return false;
}
virtual bool RtcpFbTransportCCIsSet() const {
for (const auto& fb : mOtherFbTypes) {
if (fb.type == SdpRtcpFbAttributeList::kTransportCC) {
return true;
}
}
return false;
}
void EnsureNoDuplicatePayloadTypes(std::set<std::string>& aUsedPts) override {
JsepCodecDescription::EnsureNoDuplicatePayloadTypes(aUsedPts);
if (mFECEnabled) {
mFECEnabled = EnsurePayloadTypeNotDuplicate(aUsedPts, mREDPayloadType) &&
EnsurePayloadTypeNotDuplicate(aUsedPts, mULPFECPayloadType);
}
if (mRtxEnabled) {
mRtxEnabled = EnsurePayloadTypeNotDuplicate(aUsedPts, mRtxPayloadType);
}
}
JSEP_CODEC_CLONE(JsepVideoCodecDescription)
std::vector<std::string> mAckFbTypes;
std::vector<std::string> mNackFbTypes;
std::vector<std::string> mCcmFbTypes;
std::vector<SdpRtcpFbAttributeList::Feedback> mOtherFbTypes;
bool mTmmbrEnabled;
bool mRembEnabled;
bool mFECEnabled;
bool mTransportCCEnabled;
bool mRtxEnabled;
std::string mREDPayloadType;
std::string mREDRTXPayloadType;
std::string mULPFECPayloadType;
std::string mRtxPayloadType;
// H264-specific stuff
uint32_t mProfileLevelId;
uint32_t mPacketizationMode;
std::string mSpropParameterSets;
};
class JsepApplicationCodecDescription : public JsepCodecDescription {
// This is the new draft-21 implementation
public:
JsepApplicationCodecDescription(const std::string& name, uint16_t channels,
uint16_t localPort,
uint32_t localMaxMessageSize,
bool enabled = true)
: JsepCodecDescription("", name, 0, channels, enabled),
mLocalPort(localPort),
mLocalMaxMessageSize(localMaxMessageSize),
mRemotePort(0),
mRemoteMaxMessageSize(0),
mRemoteMMSSet(false) {}
static constexpr SdpMediaSection::MediaType type =
SdpMediaSection::kApplication;
SdpMediaSection::MediaType Type() const override { return type; }
JSEP_CODEC_CLONE(JsepApplicationCodecDescription)
static UniquePtr<JsepApplicationCodecDescription> CreateDefault() {
return MakeUnique<JsepApplicationCodecDescription>(
"webrtc-datachannel", WEBRTC_DATACHANNEL_STREAMS_DEFAULT,
WEBRTC_DATACHANNEL_PORT_DEFAULT,
WEBRTC_DATACHANNEL_MAX_MESSAGE_SIZE_LOCAL);
}
// Override, uses sctpport or sctpmap instead of rtpmap
virtual bool Matches(const std::string& fmt,
const SdpMediaSection& remoteMsection) const override {
if (type != remoteMsection.GetMediaType()) {
return false;
}
int sctp_port = remoteMsection.GetSctpPort();
bool fmt_matches =
nsCRT::strcasecmp(mName.c_str(),
remoteMsection.GetFormats()[0].c_str()) == 0;
if (sctp_port && fmt_matches) {
// New sctp draft 21 format
return true;
}
const SdpSctpmapAttributeList::Sctpmap* sctp_map(
remoteMsection.GetSctpmap());
if (sctp_map) {
// Old sctp draft 05 format
return nsCRT::strcasecmp(mName.c_str(), sctp_map->name.c_str()) == 0;
}
return false;
}
virtual void AddToMediaSection(SdpMediaSection& msection) const override {
if (mEnabled && msection.GetMediaType() == type) {
if (mDirection == sdp::kRecv) {
msection.AddDataChannel(mName, mLocalPort, mChannels,
mLocalMaxMessageSize);
}
AddParametersToMSection(msection);
}
}
bool Negotiate(const std::string& pt, const SdpMediaSection& remoteMsection,
bool remoteIsOffer,
Maybe<const SdpMediaSection&> localMsection) override {
JsepCodecDescription::Negotiate(pt, remoteMsection, remoteIsOffer,
localMsection);
uint32_t message_size;
mRemoteMMSSet = remoteMsection.GetMaxMessageSize(&message_size);
if (mRemoteMMSSet) {
mRemoteMaxMessageSize = message_size;
} else {
mRemoteMaxMessageSize =
WEBRTC_DATACHANNEL_MAX_MESSAGE_SIZE_REMOTE_DEFAULT;
}
int sctp_port = remoteMsection.GetSctpPort();
if (sctp_port) {
mRemotePort = sctp_port;
return true;
}
const SdpSctpmapAttributeList::Sctpmap* sctp_map(
remoteMsection.GetSctpmap());
if (sctp_map) {
mRemotePort = std::stoi(sctp_map->pt);
return true;
}
return false;
}
// We only support one datachannel per m-section
void EnsureNoDuplicatePayloadTypes(std::set<std::string>& aUsedPts) override {
}
void ApplyConfigToFmtp(
UniquePtr<SdpFmtpAttributeList::Parameters>& aFmtp) const override{};
uint16_t mLocalPort;
uint32_t mLocalMaxMessageSize;
uint16_t mRemotePort;
uint32_t mRemoteMaxMessageSize;
bool mRemoteMMSSet;
};
} // namespace mozilla
#endif