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webrtc rtp扩展(extmap)支持方向设定

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This commit is contained in:
ziyue 2021-10-14 16:18:01 +08:00
parent aaecd74080
commit b2bec61932
2 changed files with 53 additions and 51 deletions
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102
webrtc/Sdp.cpp
View File

@ -1435,7 +1435,7 @@ void RtcConfigure::RtcTrackConfigure::enableTWCC(bool enable){
extmap.erase(RtpExtType::transport_cc);
} else {
rtcp_fb.emplace(SdpConst::kTWCCRtcpFb);
extmap.emplace(RtpExtType::transport_cc);
extmap.emplace(RtpExtType::transport_cc, RtpDirection::sendrecv);
}
}
@ -1445,7 +1445,7 @@ void RtcConfigure::RtcTrackConfigure::enableREMB(bool enable){
extmap.erase(RtpExtType::abs_send_time);
} else {
rtcp_fb.emplace(SdpConst::kRembRtcpFb);
extmap.emplace(RtpExtType::abs_send_time);
extmap.emplace(RtpExtType::abs_send_time, RtpDirection::sendrecv);
}
}
@ -1465,14 +1465,14 @@ void RtcConfigure::RtcTrackConfigure::setDefaultSetting(TrackType type){
preferred_codec = {CodecAAC, CodecG711U, CodecG711A, CodecOpus};
rtcp_fb = {SdpConst::kTWCCRtcpFb, SdpConst::kRembRtcpFb};
extmap = {
RtpExtType::ssrc_audio_level,
RtpExtType::csrc_audio_level,
RtpExtType::abs_send_time,
RtpExtType::transport_cc,
{RtpExtType::ssrc_audio_level, RtpDirection::sendrecv},
{RtpExtType::csrc_audio_level, RtpDirection::sendrecv},
{RtpExtType::abs_send_time, RtpDirection::sendrecv},
{RtpExtType::transport_cc, RtpDirection::sendrecv},
//rtx重传rtp时，忽略sdes_mid类型的rtp ext,实测发现Firefox在接收rtx时，如果存在sdes_mid的ext,将导致无法播放
//RtpExtType::sdes_mid,
RtpExtType::sdes_rtp_stream_id,
RtpExtType::sdes_repaired_rtp_stream_id
//{RtpExtType::sdes_mid,RtpDirection::sendrecv},
{RtpExtType::sdes_rtp_stream_id, RtpDirection::sendrecv},
{RtpExtType::sdes_repaired_rtp_stream_id, RtpDirection::sendrecv}
};
break;
}
@ -1481,19 +1481,19 @@ void RtcConfigure::RtcTrackConfigure::setDefaultSetting(TrackType type){
preferred_codec = {CodecH264, CodecH265, CodecAV1};
rtcp_fb = {SdpConst::kTWCCRtcpFb, SdpConst::kRembRtcpFb, "nack", "ccm fir", "nack pli"};
extmap = {
RtpExtType::abs_send_time,
RtpExtType::transport_cc,
{RtpExtType::abs_send_time, RtpDirection::sendrecv},
{RtpExtType::transport_cc, RtpDirection::sendrecv},
//rtx重传rtp时，忽略sdes_mid类型的rtp ext,实测发现Firefox在接收rtx时，如果存在sdes_mid的ext,将导致无法播放
//RtpExtType::sdes_mid,
RtpExtType::sdes_rtp_stream_id,
RtpExtType::sdes_repaired_rtp_stream_id,
RtpExtType::video_timing,
RtpExtType::color_space,
RtpExtType::video_content_type,
RtpExtType::playout_delay,
RtpExtType::video_orientation,
RtpExtType::toffset,
RtpExtType::framemarking
//{RtpExtType::sdes_mid,RtpDirection::sendrecv},
{RtpExtType::sdes_rtp_stream_id, RtpDirection::sendrecv},
{RtpExtType::sdes_repaired_rtp_stream_id, RtpDirection::sendrecv},
{RtpExtType::video_timing, RtpDirection::sendrecv},
{RtpExtType::color_space, RtpDirection::sendrecv},
{RtpExtType::video_content_type, RtpDirection::sendrecv},
{RtpExtType::playout_delay, RtpDirection::sendrecv},
{RtpExtType::video_orientation, RtpDirection::sendrecv},
{RtpExtType::toffset, RtpDirection::sendrecv},
{RtpExtType::framemarking, RtpDirection::sendrecv}
};
break;
}
@ -1616,6 +1616,31 @@ shared_ptr<RtcSession> RtcConfigure::createAnswer(const RtcSession &offer){
return ret;
}
static RtpDirection matchDirection(RtpDirection offer_direction, RtpDirection supported){
switch (offer_direction) {
case RtpDirection::sendonly : {
if (supported != RtpDirection::recvonly && supported != RtpDirection::sendrecv) {
//我们不支持接收
return RtpDirection::inactive;
}
return RtpDirection::recvonly;
}
case RtpDirection::recvonly : {
if (supported != RtpDirection::sendonly && supported != RtpDirection::sendrecv) {
//我们不支持发送
return RtpDirection::inactive;
}
return RtpDirection::sendonly;
}
//对方支持发送接收，那么最终能力根据配置来决定
case RtpDirection::sendrecv : return (supported == RtpDirection::invalid ? RtpDirection::inactive : supported);
case RtpDirection::inactive : return RtpDirection::inactive;
default: return RtpDirection::invalid;
}
}
void RtcConfigure::matchMedia(shared_ptr<RtcSession> &ret, TrackType type, const vector<RtcMedia> &medias, const RtcTrackConfigure &configure){
bool check_profile = true;
bool check_codec = true;
@ -1682,34 +1707,9 @@ RETRY:
default: continue;
}
switch (offer_media.direction) {
case RtpDirection::sendonly : {
if (configure.direction != RtpDirection::recvonly &&
configure.direction != RtpDirection::sendrecv) {
//我们不支持接收
answer_media.direction = RtpDirection::inactive;
break;
}
answer_media.direction = RtpDirection::recvonly;
break;
}
case RtpDirection::recvonly : {
if (configure.direction != RtpDirection::sendonly &&
configure.direction != RtpDirection::sendrecv) {
//我们不支持发送
answer_media.direction = RtpDirection::inactive;
break;
}
answer_media.direction = RtpDirection::sendonly;
break;
}
case RtpDirection::sendrecv : {
//对方支持发送接收，那么最终能力根据配置来决定
answer_media.direction = (configure.direction == RtpDirection::invalid ? RtpDirection::inactive
: configure.direction);
break;
}
default: continue;
answer_media.direction = matchDirection(offer_media.direction, configure.direction);
if (answer_media.direction == RtpDirection::invalid) {
continue;
}
//添加媒体plan
@ -1747,8 +1747,10 @@ RETRY:
//对方和我方都支持的扩展，那么我们才支持
for (auto &ext : offer_media.extmap) {
if (configure.extmap.find(RtpExt::getExtType(ext.ext)) != configure.extmap.end()) {
auto it = configure.extmap.find(RtpExt::getExtType(ext.ext));
if (it != configure.extmap.end()) {
answer_media.extmap.emplace_back(ext);
answer_media.extmap.back().direction = matchDirection(ext.direction, it->second);
}
}

2
webrtc/Sdp.h
View File

@ -703,7 +703,7 @@ public:
SdpAttrFingerprint fingerprint;
set<string> rtcp_fb;
set<RtpExtType> extmap;
map<RtpExtType, RtpDirection> extmap;
vector<CodecId> preferred_codec;
vector<SdpAttrCandidate> candidate;