How to use StartRTPDump() function in WebRTC correctly? - c++

Question

I am sending an audio stream from my browser (Chrome) to the "peerconnection_client" sample application (trunk\talk\examples\peerconnection) and trying to dump it into a file using StartRTPDump:
int StartRTPDump(int channel, const char fileNameUTF8[1024], RTPDirections direction = kRtpIncoming);
Here is my test code:
void Conductor::OnPeerConnected(int id, const std::string& name) {
LOG(INFO) << __FUNCTION__;
// Refresh the list if we're showing it.
if (main_wnd_->current_ui() == MainWindow::LIST_PEERS)
main_wnd_->SwitchToPeerList(client_->peers());
// My test code
{
voe_ = webrtc::VoiceEngine::Create();
webrtc::VoEBase* voeBase = webrtc::VoEBase::GetInterface(voe_);
rtp_rtcp_ = webrtc::VoERTP_RTCP::GetInterface(voe_);
voeBase->Init();
channelId_ = voeBase->CreateChannel();
bool isActive = rtp_rtcp_->RTPDumpIsActive(channelId_); // "isActive" is false
int ret = rtp_rtcp_->StartRTPDump(channelId_, "AudioStreamFromRemotePeer.rtp"); // "ret" is 0
isActive = rtp_rtcp_->RTPDumpIsActive(channelId_); // "isActive" is true
}
}
void Conductor::OnPeerDisconnected(int id) {
LOG(INFO) << __FUNCTION__;
if (id == peer_id_) {
LOG(INFO) << "Our peer disconnected";
main_wnd_->QueueUIThreadCallback(PEER_CONNECTION_CLOSED, NULL);
} else {
// Refresh the list if we're showing it.
if (main_wnd_->current_ui() == MainWindow::LIST_PEERS)
main_wnd_->SwitchToPeerList(client_->peers());
}
// My test code
{
bool isActive = rtp_rtcp_->RTPDumpIsActive(channelId_); // "isActive" is true
int ret = rtp_rtcp_->StopRTPDump(channelId_); // "ret" is 0
isActive = rtp_rtcp_->RTPDumpIsActive(channelId_); // "isActive" is false
rtp_rtcp_->Release();
webrtc::VoiceEngine::Delete(voe_);
}
}
When I set a breakpoint inside the following function after calling OnPeerConnected() but before OnPeerDisconnected():
int32_t Channel::ReceivedRTPPacket(const int8_t* data, int32_t length, const PacketTime& packet_time)
{
WEBRTC_TRACE(kTraceStream, kTraceVoice, VoEId(_instanceId,_channelId), "Channel::ReceivedRTPPacket()"); // "_channelId" here matches to "channelId_" above
....
}
I can see incoming data.
But the generated .rtp file after calling OnPeerDisconnected() looks like:
Why am I not getting any data in my .rtp file?