Merge AudioRendererImpl and AudioRendererBase; add NullAudioSink

content/renderer/media/render_audiosourceprovider.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/render_audiosourceprovider.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebAudioSourceProviderClient.h"
 
@@ skipping 39 matching lines @@
   is_running_ = true;
 }
 
 void RenderAudioSourceProvider::Pause(bool flush) {
   base::AutoLock auto_lock(sink_lock_);
   if (!client_)
     default_sink_->Pause(flush);
   is_running_ = false;
 }
 
+void RenderAudioSourceProvider::SetPlaybackRate(float rate) {
+  base::AutoLock auto_lock(sink_lock_);
+  if (!client_)
+    default_sink_->SetPlaybackRate(rate);
+}
+
 bool RenderAudioSourceProvider::SetVolume(double volume) {
   base::AutoLock auto_lock(sink_lock_);
   if (!client_)
     default_sink_->SetVolume(volume);
   volume_ = volume;
   return true;
 }
 
 void RenderAudioSourceProvider::GetVolume(double* volume) {
   if (!client_)
@@ skipping 62 matching lines @@
 
     // TODO(crogers): figure out if we should volume scale here or in common
     // WebAudio code.  In any case we need to take care of volume.
     renderer_->Render(v, number_of_frames, 0);
   } else {
     // Provide silence if the source is not running.
     for (size_t i = 0; i < audio_data.size(); ++i)
       memset(audio_data[i], 0, sizeof(float) * number_of_frames);
   }
 }