Support for remote audio into tracks

talk/media/webrtc/webrtcvoiceengine.cc

Index: talk/media/webrtc/webrtcvoiceengine.cc
diff --git a/talk/media/webrtc/webrtcvoiceengine.cc b/talk/media/webrtc/webrtcvoiceengine.cc
index 0b5bed1623753545b2087a6c61f595ea52fcf7f4..726bc1578f1249cf720d536e4de1a42ff03f6f28 100644
--- a/talk/media/webrtc/webrtcvoiceengine.cc
+++ b/talk/media/webrtc/webrtcvoiceengine.cc
@@ -1248,6 +1248,11 @@ class WebRtcVoiceMediaChannel::WebRtcAudioReceiveStream {
     return config_.voe_channel_id;
   }
 
+  void SetRawAudioSink(rtc::scoped_ptr<webrtc::AudioSink> sink) {
+    RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
+    stream_->SetSink(std::move(sink));
+  }
+
  private:
   void RecreateAudioReceiveStream(bool use_combined_bwe,
       const std::vector<webrtc::RtpExtension>& extensions) {
@@ -2032,6 +2037,7 @@ bool WebRtcVoiceMediaChannel::RemoveRecvStream(uint32_t ssrc) {
   // Clean up and delete the receive stream+channel.
   LOG(LS_INFO) << "Removing audio receive stream " << ssrc
                << " with VoiceEngine channel #" << channel << ".";
+  it->second->SetRawAudioSink(nullptr);
   delete it->second;
   recv_streams_.erase(it);
   return DeleteVoEChannel(channel);
@@ -2408,6 +2414,18 @@ bool WebRtcVoiceMediaChannel::GetStats(VoiceMediaInfo* info) {
   return true;
 }
 
+void WebRtcVoiceMediaChannel::SetRawAudioSink(
+    uint32_t ssrc,
+    rtc::scoped_ptr<webrtc::AudioSink> sink) {
+  RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
+  const auto it = recv_streams_.find(ssrc);
+  if (it == recv_streams_.end()) {
+    LOG(LS_WARNING) << "SetRawAudioSink: no recv stream" << ssrc;
+    return;
+  }
+  it->second->SetRawAudioSink(std::move(sink));
+}
+
 int WebRtcVoiceMediaChannel::GetOutputLevel(int channel) {
   unsigned int ulevel = 0;
   int ret = engine()->voe()->volume()->GetSpeechOutputLevel(channel, ulevel);