media/audio/null_audio_sink.h

   1 // Copyright (c) 2012 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_NULL_AUDIO_SINK_H_
   6 #define MEDIA_AUDIO_NULL_AUDIO_SINK_H_
   7
   8 #include <string>
   9
  10 #include "base/memory/scoped_ptr.h"
  11 #include "media/base/audio_renderer_sink.h"
  12
  13 namespace base {
  14 class SingleThreadTaskRunner;
  15 }
  16
  17 namespace media {
  18 class AudioBus;
  19 class AudioHash;
  20 class FakeAudioWorker;
  21 class OutputDevice;
  22
  23 class MEDIA_EXPORT NullAudioSink
  24     : NON_EXPORTED_BASE(public AudioRendererSink) {
  25  public:
  26   NullAudioSink(const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
  27
  28   // AudioRendererSink implementation.
  29   void Initialize(const AudioParameters& params,
  30                   RenderCallback* callback) override;
  31   void Start() override;
  32   void Stop() override;
  33   void Pause() override;
  34   void Play() override;
  35   bool SetVolume(double volume) override;
  36   OutputDevice* GetOutputDevice() override;
  37
  38   // Enables audio frame hashing.  Must be called prior to Initialize().
  39   void StartAudioHashForTesting();
  40
  41   // Returns the hash of all audio frames seen since construction.
  42   std::string GetAudioHashForTesting();
  43
  44  protected:
  45   ~NullAudioSink() override;
  46
  47  private:
  48   // Task that periodically calls Render() to consume audio data.
  49   void CallRender();
  50
  51   bool initialized_;
  52   bool playing_;
  53   RenderCallback* callback_;
  54
  55   // Controls whether or not a running hash is computed for audio frames.
  56   scoped_ptr<AudioHash> audio_hash_;
  57
  58   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
  59   scoped_ptr<FakeAudioWorker> fake_worker_;
  60   scoped_ptr<AudioBus> audio_bus_;
  61
  62   DISALLOW_COPY_AND_ASSIGN(NullAudioSink);
  63 };
  64
  65 }  // namespace media
  66
  67 #endif  // MEDIA_AUDIO_NULL_AUDIO_SINK_H_