Use VoiceChannel/VideoChannel directly from RtpSender/RtpReceiver.

webrtc/media/base/fakemediaengine.h

 /*
  *  Copyright (c) 2004 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 321 matching lines @@
       return false;
     }
     if (!RtpHelper<VoiceMediaChannel>::MuteStream(ssrc, !enable)) {
       return false;
     }
     if (enable && options) {
       return SetOptions(*options);
     }
     return true;
   }
+
+  bool HasSource(uint32_t ssrc) const {
+    return local_sinks_.find(ssrc) != local_sinks_.end();
+  }
+
   virtual bool AddRecvStream(const StreamParams& sp) {
     if (!RtpHelper<VoiceMediaChannel>::AddRecvStream(sp))
       return false;
     output_scalings_[sp.first_ssrc()] = 1.0;
     return true;
   }
   virtual bool RemoveRecvStream(uint32_t ssrc) {
     if (!RtpHelper<VoiceMediaChannel>::RemoveRecvStream(ssrc))
       return false;
     output_scalings_.erase(ssrc);
@@ skipping 186 matching lines @@
   bool SetSink(uint32_t ssrc,
                rtc::VideoSinkInterface<cricket::VideoFrame>* sink) override {
     if (ssrc != 0 && sinks_.find(ssrc) == sinks_.end()) {
       return false;
     }
     if (ssrc != 0) {
       sinks_[ssrc] = sink;
     }
     return true;
   }
+  bool HasSink(uint32_t ssrc) const {
+    return sinks_.find(ssrc) != sinks_.end() && sinks_.at(ssrc) != nullptr;
+  }
 
   bool SetSend(bool send) override { return set_sending(send); }
   bool SetVideoSend(
       uint32_t ssrc,
       bool enable,
       const VideoOptions* options,
       rtc::VideoSourceInterface<cricket::VideoFrame>* source) override {
     if (!RtpHelper<VideoMediaChannel>::MuteStream(ssrc, !enable)) {
       return false;
     }
     if (enable && options) {
-      return SetOptions(*options);
+      if (!SetOptions(*options)) {
+        return false;
+      }
     }
     sources_[ssrc] = source;
     return true;
   }
 
   bool HasSource(uint32_t ssrc) const {
-    return sources_.find(ssrc) != sources_.end();
+    return sources_.find(ssrc) != sources_.end() &&
+           sources_.at(ssrc) != nullptr;
   }
   bool AddRecvStream(const StreamParams& sp) override {
     if (!RtpHelper<VideoMediaChannel>::AddRecvStream(sp))
       return false;
     sinks_[sp.first_ssrc()] = NULL;
     return true;
   }
   bool RemoveRecvStream(uint32_t ssrc) override {
     if (!RtpHelper<VideoMediaChannel>::RemoveRecvStream(ssrc))
       return false;
@@ skipping 374 matching lines @@
 
  private:
   std::vector<FakeDataMediaChannel*> channels_;
   std::vector<DataCodec> data_codecs_;
   DataChannelType last_channel_type_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_BASE_FAKEMEDIAENGINE_H_