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修复未开启sctp时，webrtc datachannel sdp交换相关bug (#2791)

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主要优化如下：
1、通过设置port为0 声明不支持datachannel(而不是inactive)。
2、设置正确的ice用户名和密码，防止ice建联失败。
3、group attribute移除datachannel的mid。
3、datachannel 相关sdp移除rtcp相关描述。
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Dw9 2023-08-29 11:22:30 +08:00 committed by GitHub
parent 0844f09e24
commit 81966f2c48
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2 changed files with 12 additions and 7 deletions
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13
webrtc/Sdp.cpp
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@ -1555,7 +1555,10 @@ shared_ptr<RtcSession> RtcConfigure::createAnswer(const RtcSession &offer) const
//设置音视频端口复用
if (!offer.group.mids.empty()) {
for (auto &m : ret->media) {
ret->group.mids.emplace_back(m.mid);
//The remote end has rejected (port 0) the m-section, so it should not be putting its mid in the group attribute.
if (m.port) {
ret->group.mids.emplace_back(m.mid);
}
}
}
return ret;
@ -1613,15 +1616,15 @@ RETRY:
if (offer_media.type == TrackApplication) {
RtcMedia answer_media = offer_media;
answer_media.role = mathDtlsRole(offer_media.role);
#ifdef ENABLE_SCTP
answer_media.direction = matchDirection(offer_media.direction, configure.direction);
answer_media.candidate = configure.candidate;
answer_media.ice_ufrag = configure.ice_ufrag;
answer_media.ice_pwd = configure.ice_pwd;
answer_media.fingerprint = configure.fingerprint;
answer_media.ice_lite = configure.ice_lite;
#ifdef ENABLE_SCTP
answer_media.candidate = configure.candidate;
#else
answer_media.direction = RtpDirection::inactive;
answer_media.port = 0;
WarnL << "answer sdp忽略application mline, 请安装usrsctp后再测试datachannel功能";
#endif
ret->media.emplace_back(answer_media);
return;

6
webrtc/WebRtcTransport.cpp
View File

@ -564,8 +564,10 @@ void WebRtcTransportImp::onCheckAnswer(RtcSession &sdp) {
GET_CONFIG(uint16_t, udp_port, Rtc::kPort);
GET_CONFIG(uint16_t, tcp_port, Rtc::kTcpPort);
m.rtcp_addr.port = udp_port ? udp_port : tcp_port;
m.port = m.rtcp_addr.port;
m.port = m.port ? (udp_port ? udp_port : tcp_port) : 0;
if (m.type != TrackApplication) {
m.rtcp_addr.port = m.port;
}
sdp.origin.address = m.addr.address;
}