Very early implementation for HTMLMediaElement / Web Audio API integration

content/renderer/media/audio_device.h

 // Copyright (c) 2011 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.
 //
 // Low-latency audio rendering unit utilizing audio output stream provided
 // by browser process through IPC.
 //
 // Relationship of classes.
 //
 //  AudioOutputController                AudioDevice
@@ skipping 36 matching lines @@
 #define CONTENT_RENDERER_MEDIA_AUDIO_DEVICE_H_
 #pragma once
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/shared_memory.h"
 #include "base/threading/simple_thread.h"
 #include "content/renderer/media/audio_message_filter.h"
+#include "media/filters/audio_renderer_sink.h"
 
 struct AudioParameters;
 
 class AudioDevice
     : public AudioMessageFilter::Delegate,
       public base::DelegateSimpleThread::Delegate,
-      public base::RefCountedThreadSafe<AudioDevice> {
+      public media::AudioRendererSink {
  public:
-  class RenderCallback {
-   public:
-    virtual void Render(const std::vector<float*>& audio_data,
-                        size_t number_of_frames,
-                        size_t audio_delay_milliseconds) = 0;
-   protected:
-    virtual ~RenderCallback() {}
-  };
 
   // Methods called on main render thread -------------------------------------
   AudioDevice(size_t buffer_size,
               int channels,
               double sample_rate,
               RenderCallback* callback);
   virtual ~AudioDevice();
 
   // Starts audio playback. Returns |true| on success.
-  bool Start();
+  virtual bool Start();
 
   // Stops audio playback. Returns |true| on success.
-  bool Stop();
+  virtual bool Stop();
 
   // Sets the playback volume, with range [0.0, 1.0] inclusive.
   // Returns |true| on success.
-  bool SetVolume(double volume);
+  virtual bool SetVolume(double volume);
 
   // Gets the playback volume, with range [0.0, 1.0] inclusive.
   // Returns |true| on success.
   bool GetVolume(double* volume);
 
   double sample_rate() const { return sample_rate_; }
   size_t buffer_size() const { return buffer_size_; }
 
   static double GetAudioHardwareSampleRate();
 
@@ skipping 62 matching lines @@
 
   // Data transfer between browser and render process uses a combination
   // of sync sockets and shared memory to provide lowest possible latency.
   scoped_ptr<base::SharedMemory> shared_memory_;
   scoped_ptr<base::SyncSocket> socket_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(AudioDevice);
 };
 
 #endif  // CONTENT_RENDERER_MEDIA_AUDIO_DEVICE_H_