commit 81c3a0300486f49ca5dae5c0a7f50ae858dd78fa
author zhihuang <zhihuang@webrtc.org> Thu Nov 17 12:06:24 2016 -0800
committer Commit bot <commit-bot@chromium.org> Thu Nov 17 20:06:37 2016 +0000
tree 369d95d20730bbc36517daffb0670b6fb90ea814
parent 5b93db2a5334d7b0d6fff22655679864e6c187f6

Added a callback function OnAddTrack to PeerConnectionObserver

Added the callback in native c++ API.
The callback function is called when a track is added and a new RtpReceiver is created.
The application can tell when tracks are added to the streams by listening to this callback.

BUG=webrtc:6112

Review-Url: https://codereview.webrtc.org/2505173002
Cr-Commit-Position: refs/heads/master@{#15142}

webrtc/api/peerconnection.cc

diff --git a/webrtc/api/peerconnection.cc b/webrtc/api/peerconnection.cc
index a1ce6ab..46bdec5 100644
--- a/webrtc/api/peerconnection.cc
+++ b/webrtc/api/peerconnection.cc
@@ -1426,20 +1426,29 @@
 void PeerConnection::CreateAudioReceiver(MediaStreamInterface* stream,
                                          const std::string& track_id,
                                          uint32_t ssrc) {
-  receivers_.push_back(
-      RtpReceiverProxyWithInternal<RtpReceiverInternal>::Create(
+  rtc::scoped_refptr<RtpReceiverProxyWithInternal<RtpReceiverInternal>>
+      receiver = RtpReceiverProxyWithInternal<RtpReceiverInternal>::Create(
           signaling_thread(), new AudioRtpReceiver(stream, track_id, ssrc,
-                                                   session_->voice_channel())));
+                                                   session_->voice_channel()));
+
+  receivers_.push_back(receiver);
+  std::vector<rtc::scoped_refptr<MediaStreamInterface>> streams;
+  streams.push_back(rtc::scoped_refptr<MediaStreamInterface>(stream));
+  observer_->OnAddTrack(receiver, streams);
 }
 
 void PeerConnection::CreateVideoReceiver(MediaStreamInterface* stream,
                                          const std::string& track_id,
                                          uint32_t ssrc) {
-  receivers_.push_back(
-      RtpReceiverProxyWithInternal<RtpReceiverInternal>::Create(
+  rtc::scoped_refptr<RtpReceiverProxyWithInternal<RtpReceiverInternal>>
+      receiver = RtpReceiverProxyWithInternal<RtpReceiverInternal>::Create(
           signaling_thread(),
           new VideoRtpReceiver(stream, track_id, factory_->worker_thread(),
-                               ssrc, session_->video_channel())));
+                               ssrc, session_->video_channel()));
+  receivers_.push_back(receiver);
+  std::vector<rtc::scoped_refptr<MediaStreamInterface>> streams;
+  streams.push_back(rtc::scoped_refptr<MediaStreamInterface>(stream));
+  observer_->OnAddTrack(receiver, streams);
 }
 
 // TODO(deadbeef): Keep RtpReceivers around even if track goes away in remote