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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_RENDERER_WEBAUDIODEVICE_IMPL_H_
      6 #define CONTENT_RENDERER_MEDIA_MEDIA_RENDERER_WEBAUDIODEVICE_IMPL_H_
      7 
      8 #include "base/memory/ref_counted.h"
      9 #include "base/threading/thread_checker.h"
     10 #include "media/audio/audio_parameters.h"
     11 #include "media/base/audio_renderer_sink.h"
     12 #include "third_party/WebKit/public/platform/WebAudioDevice.h"
     13 #include "third_party/WebKit/public/platform/WebVector.h"
     14 
     15 namespace media {
     16 class AudioOutputDevice;
     17 }
     18 
     19 namespace content {
     20 
     21 class RendererWebAudioDeviceImpl
     22     : public blink::WebAudioDevice,
     23       public media::AudioRendererSink::RenderCallback {
     24  public:
     25   RendererWebAudioDeviceImpl(const media::AudioParameters& params,
     26                              blink::WebAudioDevice::RenderCallback* callback,
     27                              int session_id);
     28   virtual ~RendererWebAudioDeviceImpl();
     29 
     30   // blink::WebAudioDevice implementation.
     31   virtual void start();
     32   virtual void stop();
     33   virtual double sampleRate();
     34 
     35   // AudioRendererSink::RenderCallback implementation.
     36   virtual int Render(media::AudioBus* dest,
     37                      int audio_delay_milliseconds) OVERRIDE;
     38 
     39   virtual void OnRenderError() OVERRIDE;
     40 
     41  private:
     42   const media::AudioParameters params_;
     43 
     44   // Weak reference to the callback into WebKit code.
     45   blink::WebAudioDevice::RenderCallback* const client_callback_;
     46 
     47   // To avoid the need for locking, ensure the control methods of the
     48   // blink::WebAudioDevice implementation are called on the same thread.
     49   base::ThreadChecker thread_checker_;
     50 
     51   // When non-NULL, we are started.  When NULL, we are stopped.
     52   scoped_refptr<media::AudioOutputDevice> output_device_;
     53 
     54   // ID to allow browser to select the correct input device for unified IO.
     55   int session_id_;
     56 
     57   DISALLOW_COPY_AND_ASSIGN(RendererWebAudioDeviceImpl);
     58 };
     59 
     60 }  // namespace content
     61 
     62 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_RENDERER_WEBAUDIODEVICE_IMPL_H_
     63