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