Associate audio streams with their source/destination RenderView.

content/renderer/media/audio_renderer_mixer_manager.h

 // 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.
 
 #ifndef CONTENT_RENDERER_MEDIA_AUDIO_RENDERER_MIXER_MANAGER_H_
 #define CONTENT_RENDERER_MEDIA_AUDIO_RENDERER_MIXER_MANAGER_H_
 
 #include <map>
 
 #include "base/synchronization/lock.h"
 #include "content/common/content_export.h"
 #include "media/audio/audio_parameters.h"
+#include "media/base/audio_renderer_sink.h"
 
 namespace media {
 class AudioRendererMixer;
 class AudioRendererMixerInput;
 }
 
 namespace content {
 
 // Manages sharing of an AudioRendererMixer among AudioRendererMixerInputs based
 // on their AudioParameters configuration.  Inputs with the same AudioParameters
 // configuration will share a mixer while a new AudioRendererMixer will be
 // lazily created if one with the exact AudioParameters does not exist.
 //
 // There should only be one instance of AudioRendererMixerManager per render
 // thread.
 //
 // TODO(dalecurtis): Right now we require AudioParameters to be an exact match
 // when we should be able to ignore bits per channel since we're only dealing
 // with floats.  However, bits per channel is currently used to interleave the
 // audio data by AudioOutputDevice::AudioThreadCallback::Process for consumption
 // via the shared memory.  See http://crbug.com/114700.
 class CONTENT_EXPORT AudioRendererMixerManager {
  public:
   // Construct an instance using the given audio hardware configuration.
   AudioRendererMixerManager(int hardware_sample_rate, int hardware_buffer_size);
-  ~AudioRendererMixerManager();
+  virtual ~AudioRendererMixerManager();

[scherkus (not reviewing), 2012/11/27 22:55:26]

sadness.

why not add a SetAudioRendererSinkForTesting() or something similar?

[miu, 2012/11/28 07:26:20]

Done.

 
   // Creates an AudioRendererMixerInput with the proper callbacks necessary to
   // retrieve an AudioRendererMixer instance from AudioRendererMixerManager.
   // Caller must ensure AudioRendererMixerManager outlives the returned input.
   media::AudioRendererMixerInput* CreateInput();
 
  private:
   friend class AudioRendererMixerManagerTest;
 
+  // Returns a new instance connected to the underlying audio implementation.
+  // This method is overridden for unit testing.
+  virtual media::AudioRendererSink* CreateAudioRendererSink();
+
   // Returns a mixer instance based on AudioParameters; an existing one if one
   // with the provided AudioParameters exists or a new one if not.
   media::AudioRendererMixer* GetMixer(const media::AudioParameters& params);
 
   // Remove a mixer instance given a mixer if the only other reference is held
   // by AudioRendererMixerManager.  Every AudioRendererMixer owner must call
   // this method when it's done with a mixer.
   void RemoveMixer(const media::AudioParameters& params);
 
   // Map of AudioParameters to <AudioRendererMixer, Count>.  Count allows
@@ skipping 12 matching lines @@
   // each AudioRendererMixer instance.
   int hardware_sample_rate_;
   int hardware_buffer_size_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererMixerManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_AUDIO_RENDERER_MIXER_MANAGER_H_