media/audio/clockless_audio_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_AUDIO_CLOCKLESS_AUDIO_SINK_H_
   6 #define MEDIA_AUDIO_CLOCKLESS_AUDIO_SINK_H_
   7
   8 #include <string>
   9
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/time/time.h"
  12 #include "media/base/audio_renderer_sink.h"
  13
  14 namespace base {
  15 class SingleThreadTaskRunner;
  16 }
  17
  18 namespace media {
  19 class AudioBus;
  20 class ClocklessAudioSinkThread;
  21 class OutputDevice;
  22
  23 // Implementation of an AudioRendererSink that consumes the audio as fast as
  24 // possible. This class does not support multiple Play()/Pause() events.
  25 class MEDIA_EXPORT ClocklessAudioSink
  26     : NON_EXPORTED_BASE(public AudioRendererSink) {
  27  public:
  28   ClocklessAudioSink();
  29
  30   // AudioRendererSink implementation.
  31   void Initialize(const AudioParameters& params,
  32                   RenderCallback* callback) override;
  33   void Start() override;
  34   void Stop() override;
  35   void Pause() override;
  36   void Play() override;
  37   bool SetVolume(double volume) override;
  38   OutputDevice* GetOutputDevice() override;
  39
  40   // Returns the time taken to consume all the audio.
  41   base::TimeDelta render_time() { return playback_time_; }
  42
  43   // Enables audio frame hashing.  Must be called prior to Initialize().
  44   void StartAudioHashForTesting();
  45
  46   // Returns the hash of all audio frames seen since construction.
  47   std::string GetAudioHashForTesting();
  48
  49  protected:
  50   ~ClocklessAudioSink() override;
  51
  52  private:
  53   scoped_ptr<ClocklessAudioSinkThread> thread_;
  54   bool initialized_;
  55   bool playing_;
  56   bool hashing_;
  57
  58   // Time taken in last set of Render() calls.
  59   base::TimeDelta playback_time_;
  60
  61   DISALLOW_COPY_AND_ASSIGN(ClocklessAudioSink);
  62 };
  63
  64 }  // namespace media
  65
  66 #endif  // MEDIA_AUDIO_CLOCKLESS_AUDIO_SINK_H_