media/filters/audio_renderer_impl.h

   1 // Copyright (c) 2011 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 MEDIA_FILTERS_AUDIO_RENDERER_IMPL_H_
   6 #define MEDIA_FILTERS_AUDIO_RENDERER_IMPL_H_
   7
   8 // This is the default implementation of AudioRenderer, which uses the audio
   9 // interfaces to open an audio device.  Although it cannot be used in the
  10 // sandbox, it serves as a reference implementation and can be used in other
  11 // applications such as the test player.
  12 //
  13 // Note: THIS IS NOT THE AUDIO RENDERER USED IN CHROME.
  14 //
  15 // See src/chrome/renderer/media/audio_renderer_impl.h for chrome's
  16 // implementation.
  17
  18 #include <deque>
  19
  20 #include "media/audio/audio_io.h"
  21 #include "media/base/buffers.h"
  22 #include "media/base/filters.h"
  23 #include "media/filters/audio_renderer_base.h"
  24
  25 namespace media {
  26
  27 class AudioRendererImpl
  28     : public AudioRendererBase,
  29       public AudioOutputStream::AudioSourceCallback {
  30  public:
  31   AudioRendererImpl();
  32   virtual ~AudioRendererImpl();
  33
  34   // Filter implementation.
  35   virtual void SetPlaybackRate(float playback_rate);
  36
  37   // AudioRenderer implementation.
  38   virtual void SetVolume(float volume);
  39
  40   // AudioSourceCallback implementation.
  41   virtual uint32 OnMoreData(AudioOutputStream* stream, uint8* dest,
  42                             uint32 len, AudioBuffersState buffers_state);
  43   virtual void OnClose(AudioOutputStream* stream);
  44   virtual void OnError(AudioOutputStream* stream, int code);
  45
  46  protected:
  47   // AudioRendererBase implementation.
  48   virtual bool OnInitialize(const AudioDecoderConfig& config);
  49   virtual void OnStop();
  50
  51  private:
  52   // Audio output stream device.
  53   AudioOutputStream* stream_;
  54   int bytes_per_second_;
  55
  56   DISALLOW_COPY_AND_ASSIGN(AudioRendererImpl);
  57 };
  58
  59 }  // namespace media
  60
  61 #endif  // MEDIA_FILTERS_AUDIO_RENDERER_IMPL_H_