media/base/fake_audio_renderer_sink.h

   1 // Copyright 2013 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_BASE_FAKE_AUDIO_RENDERER_SINK_H_
   6 #define MEDIA_BASE_FAKE_AUDIO_RENDERER_SINK_H_
   7
   8 #include <string>
   9
  10 #include "media/audio/audio_parameters.h"
  11 #include "media/base/audio_renderer_sink.h"
  12
  13 namespace media {
  14
  15 class FakeOutputDevice;
  16
  17 class FakeAudioRendererSink : public AudioRendererSink {
  18  public:
  19   enum State {
  20     kUninitialized,
  21     kInitialized,
  22     kStarted,
  23     kPaused,
  24     kPlaying,
  25     kStopped
  26   };
  27
  28   FakeAudioRendererSink();
  29
  30   void Initialize(const AudioParameters& params,
  31                   RenderCallback* callback) override;
  32   void Start() override;
  33   void Stop() override;
  34   void Pause() override;
  35   void Play() override;
  36   bool SetVolume(double volume) override;
  37   OutputDevice* GetOutputDevice() override;
  38
  39   // Attempts to call Render() on the callback provided to
  40   // Initialize() with |dest| and |audio_delay_milliseconds|.
  41   // Returns true and sets |frames_written| to the return value of the
  42   // Render() call.
  43   // Returns false if this object is in a state where calling Render()
  44   // should not occur. (i.e., in the kPaused or kStopped state.) The
  45   // value of |frames_written| is undefined if false is returned.
  46   bool Render(AudioBus* dest, int audio_delay_milliseconds,
  47               int* frames_written);
  48   void OnRenderError();
  49
  50   State state() const { return state_; }
  51
  52  protected:
  53   ~FakeAudioRendererSink() override;
  54
  55  private:
  56   void ChangeState(State new_state);
  57
  58   State state_;
  59   RenderCallback* callback_;
  60   scoped_ptr<FakeOutputDevice> output_device_;
  61
  62   DISALLOW_COPY_AND_ASSIGN(FakeAudioRendererSink);
  63 };
  64
  65 }  // namespace media
  66
  67 #endif  // MEDIA_BASE_FAKE_AUDIO_RENDERER_SINK_H_