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      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_
     62