audiosourceprovider_impl.h

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
//

#ifndef CHROMIUM_MEDIA_LIB_AUDIOSOURCE_PROVIDER_IMPL_H_
#define CHROMIUM_MEDIA_LIB_AUDIOSOURCE_PROVIDER_IMPL_H_

#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/synchronization/lock.h"
#include "media/base/audio_renderer_sink.h"

namespace media {

class MediaLog;

class MEDIA_EXPORT AudioSourceProviderImpl
    : public SwitchableAudioRendererSink {
 public:
  using CopyAudioCB = base::Callback<void(std::unique_ptr<AudioBus>,
                                          uint32_t frames_delayed,
                                          int sample_rate)>;
  AudioSourceProviderImpl(scoped_refptr<SwitchableAudioRendererSink> sink,
                          MediaLog* media_log);

  // RestartableAudioRendererSink implementation.
  void Initialize(const AudioParameters& params,
                  RenderCallback* callback) override;
  void Start() override;
  void Stop() override;
  void Play() override;
  void Pause() override;
  bool SetVolume(double volume) override;
  OutputDeviceInfo GetOutputDeviceInfo() override;
  bool IsOptimizedForHardwareParameters() override;
  bool CurrentThreadIsRenderingThread() override;
  void SwitchOutputDevice(const std::string& device_id,
                          const url::Origin& security_origin,
                          const OutputDeviceStatusCB& callback) override;

 protected:
  scoped_refptr<SwitchableAudioRendererSink> CreateFallbackSink();
  ~AudioSourceProviderImpl() override;

 private:
  double volume_;
  base::Lock sink_lock_;
  scoped_refptr<SwitchableAudioRendererSink> sink_;

  class TeeFilter;
  const std::unique_ptr<TeeFilter> tee_filter_;

  MediaLog* const media_log_;

  // NOTE: Weak pointers must be invalidated before all other member variables.
  base::WeakPtrFactory<AudioSourceProviderImpl> weak_factory_;

  DISALLOW_IMPLICIT_CONSTRUCTORS(AudioSourceProviderImpl);
};
}

#endif  // CHROMIUM_MEDIA_LIB_AUDIOSOURCE_PROVIDER_IMPL_H_