Prevent a voice channel from sending data before a renderer is set.

webrtc/api/webrtcsession.h

 /*
  *  Copyright 2012 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 214 matching lines @@
 
   // Get the id used as a media stream track's "id" field from ssrc.
   virtual bool GetLocalTrackIdBySsrc(uint32_t ssrc, std::string* track_id);
   virtual bool GetRemoteTrackIdBySsrc(uint32_t ssrc, std::string* track_id);
 
   // AudioMediaProviderInterface implementation.
   void SetAudioPlayout(uint32_t ssrc, bool enable) override;
   void SetAudioSend(uint32_t ssrc,
                     bool enable,
                     const cricket::AudioOptions& options,
-                    cricket::AudioRenderer* renderer) override;
+                    cricket::AudioSource* source) override;
   void SetAudioPlayoutVolume(uint32_t ssrc, double volume) override;
   void SetRawAudioSink(uint32_t ssrc,
                        rtc::scoped_ptr<AudioSinkInterface> sink) override;
 
   // Implements VideoMediaProviderInterface.
   bool SetCaptureDevice(uint32_t ssrc, cricket::VideoCapturer* camera) override;
   void SetVideoPlayout(
       uint32_t ssrc,
       bool enable,
       rtc::VideoSinkInterface<cricket::VideoFrame>* sink) override;
@@ skipping 249 matching lines @@
   PeerConnectionInterface::BundlePolicy bundle_policy_;
 
   // Declares the RTCP mux policy for the WebRTCSession.
   PeerConnectionInterface::RtcpMuxPolicy rtcp_mux_policy_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(WebRtcSession);
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_WEBRTCSESSION_H_