Set audio format before adding pepper sink to audio track.

content/renderer/media/webrtc_local_audio_track.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/webrtc_local_audio_track.h"
 
 #include <limits>
 
 #include "content/public/renderer/media_stream_audio_sink.h"
 #include "content/renderer/media/media_stream_audio_level_calculator.h"
@@ skipping 22 matching lines @@
   DVLOG(1) << "WebRtcLocalAudioTrack::WebRtcLocalAudioTrack()";
 }
 
 WebRtcLocalAudioTrack::~WebRtcLocalAudioTrack() {
   DCHECK(main_render_thread_checker_.CalledOnValidThread());
   DVLOG(1) << "WebRtcLocalAudioTrack::~WebRtcLocalAudioTrack()";
   // Users might not call Stop() on the track.
   Stop();
 }
 
+media::AudioParameters WebRtcLocalAudioTrack::GetOutputFormat() const {
+  DCHECK(main_render_thread_checker_.CalledOnValidThread());
+  if (webaudio_source_.get()) {
+    return media::AudioParameters();
+  } else {
+    return capturer_->GetOutputFormat();
+  }
+}
+
 void WebRtcLocalAudioTrack::Capture(const media::AudioBus& audio_bus,
                                     base::TimeTicks estimated_capture_time,
                                     bool force_report_nonzero_energy) {
   DCHECK(capture_thread_checker_.CalledOnValidThread());
   DCHECK(!estimated_capture_time.is_null());
 
   // Calculate the signal level regardless of whether the track is disabled or
   // enabled.  If |force_report_nonzero_energy| is true, |audio_bus| contains
   // post-processed data that may be all zeros even though the signal contained
   // energy before the processing.  In this case, report nonzero energy even if
@@ skipping 168 matching lines @@
     (*it)->Reset();
   }
 }
 
 webrtc::AudioTrackInterface* WebRtcLocalAudioTrack::GetAudioAdapter() {
   DCHECK(thread_checker_.CalledOnValidThread());
   return adapter_.get();
 }
 
 }  // namespace content