Add a 'remote' property to MediaSourceInterface. Also adding an implementation to the relevant sour…

talk/app/webrtc/rtpsender.cc

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
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  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 166 matching lines @@
     if (stats_) {
       stats_->RemoveLocalAudioTrack(track_.get(), ssrc_);
     }
   }
   stopped_ = true;
 }
 
 void AudioRtpSender::SetAudioSend() {
   RTC_DCHECK(!stopped_ && can_send_track());
   cricket::AudioOptions options;
-  if (track_->enabled() && track_->GetSource()) {
+  if (track_->enabled() && track_->GetSource() &&
+      !track_->GetSource()->remote()) {
     // TODO(xians): Remove this static_cast since we should be able to connect

[perkj_webrtc, 2015/12/15 10:15:31]

Should we rephrase this todo to say that we should look into handling
cricket::AudioOptions options from remote audio sources (whatever that means in
the end. With a little luck there will not be any constraints/AudioOptions
needed in a track/source that a PeerConnection must care about.

[tommi, 2015/12/15 11:00:54]

I'd like to keep the TODO untouched for now so that it's easy to get to the CL
that added it from the blamelist and see the context.  Right now I think that
this isn't needed at all and is from a time when the APM was inside
PeerConnection and not on a local track.  With a little luck I'll delete this in
the next few days.

     // a remote audio track to a peer connection.
     options = static_cast<LocalAudioSource*>(track_->GetSource())->options();
   }
 
   // Use the renderer if the audio track has one, otherwise use the sink
   // adapter owned by this class.
   cricket::AudioRenderer* renderer =
       track_->GetRenderer() ? track_->GetRenderer() : sink_adapter_.get();
   ASSERT(renderer != nullptr);
   provider_->SetAudioSend(ssrc_, track_->enabled(), options, renderer);
@@ skipping 111 matching lines @@
   RTC_DCHECK(!stopped_ && can_send_track());
   const cricket::VideoOptions* options = nullptr;
   VideoSourceInterface* source = track_->GetSource();
   if (track_->enabled() && source) {
     options = source->options();
   }
   provider_->SetVideoSend(ssrc_, track_->enabled(), options);
 }
 
 }  // namespace webrtc