No video track visible on browser side in webrtc-internals when libdatachannel as answere with sending data and browser as offere with receive only data. #1477
Replies: 1 comment 2 replies
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If you want to send a predefined media stream, you should offer from sender. If you really want to answer from sender, you have to look into the media description to find a suitable format among what's offered. In particular, you must send a media format matching offered payload types. Do not match tracks according to If you want to send raw frames instead of RTP packets, simply add a packetizer in std::shared_ptr<rtc::Track> videoTrack;
int payloadType = -1;
uint32_t ssrc = 42; // your sent SSRC
[...]
void WebrtcManager::OnTrack(std::shared_ptr<rtc::Track> track) {
auto desc = track->description();
std::cout << "Track description: " << std::string(desc) << endl;
if (desc.direction() == rtc::Description::Direction::RecvOnly) // recvonly appears as sendonly on this side
return;
// Find a format we can send
for(int pt : desc.payloadTypes()) {
auto rtpMap = desc.rtpMap(pt);
if (rtpMap.format == "H264") { // for instance
// If you want to send this format, you must use payload type pt
payloadType = pt;
desc.addSSRC(ssrc, "mycname"); // Add sent SSRC
track->setDescription(std::move(desc));
// You could also add a packetizer to the track here if you want to send raw frames instead of RTP packets
// track->chainMediaHandler(packetizer);
std::atomic_store(&videoTrack, track);
break;
}
}
});
[...]
// Once the track is open you must send with payloadType and ssrc
// Assume buffer contains an RTP packet of length len
auto track = std::atomic_load(videoTrack);
if (track && len >= sizeof(rtc::RtpHeader)) {
auto rtp = reinterpret_cast<rtc::RtpHeader *>(buffer);
rtp->setPayloadType(static_cast<uint8_t>(payloadType));
rtp->setSsrc(ssrc);
track->send(reinterpret_cast<const std::byte *>(buffer), len);
} |
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@paullouisageneau I have tried as you suggested as per below function void WebrtcManager::OnTrack(std::shared_ptr<rtc::Track> track) {
std::cerr << "[Receiver][MediaChannel] OnTrack triggered!" << std::endl;
std::cerr << "[Receiver][MediaChannel] Track MID: " << track->mid() << std::endl;
//videoTrack_ = track;
auto desc = track->description();
std::cout << "Track description: " << std::string(desc) << endl;
if (desc.direction() == rtc::Description::Direction::RecvOnly) // recvonly appears as sendonly on this side
return;
std::cout << "Going inside the loop" << endl;
// Find a format we can send
for(int pt : desc.payloadTypes()) {
auto rtpMap = desc.rtpMap(pt);
if (rtpMap->format == "H264") { // for instance
// If you want to send this format, you must use payload type pt
video_payload_type_ = pt;
desc.addSSRC(video_ssrc_, "stream1"); // Add sent SSRC
track->setDescription(std::move(desc));
auto rtpConfig = std::make_shared<rtc::RtpPacketizationConfig>(video_ssrc_, "stream1", video_payload_type_, 90000);
auto separator = rtc::H264RtpPacketizer::Separator::StartSequence;
h264_packetizer_ = std::make_shared<rtc::H264RtpPacketizer>(separator, rtpConfig, (std::size_t)max_rtp_payload_size_);
// You could also add a packetizer to the track here if you want to send raw frames instead of RTP packets
std::cout << "chaining handler" << endl;
track->chainMediaHandler(h264_packetizer_);
std::atomic_store(&videoTrack_, track);
break;
}
}
}but everytime it crashed std::atomic_store(&videoTrack_, track); <---- here . In Both Case not working as mentioned in 1st message. Can you quick check and let me know is anything I am doing wrong? sender working as answrer. you help make removal blocker for us, thank you. |
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If it crashes you have to debug your code. The fact that it doesn't crash when removing the packetizer means the problem is probably not about assigning |
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I have created code in c++ with libdatachannel. On Browser Side used below client.js code block for track adding
On Server Side I am checking On Track Callback and used that videotrack pointer for sending the RTP packet. RTP packet generating manually with fix SSRC and payload type received from Offer.
after that I am sending packet using send function. data sending log visible. but no Video or tracks stats visible on browser side or in chrome:/wbertc-internal page.
Can you help me to identify any error in usage of libdatachannel. can I use RTPpacketizer on sender side with answerer. Can you please provide me code snippet that I can use of.
OFFER FROM BROWSER SIDE
(IP masked) Please reveiew and update
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