chromium/media/base/silent_sink_suspender.h

// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_BASE_SILENT_SINK_SUSPENDER_H_
#define MEDIA_BASE_SILENT_SINK_SUSPENDER_H_

#include <stdint.h>

#include "base/cancelable_callback.h"
#include "base/compiler_specific.h"
#include "base/containers/circular_deque.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/synchronization/lock.h"
#include "base/thread_annotations.h"
#include "base/time/time.h"
#include "media/base/audio_parameters.h"
#include "media/base/audio_renderer_sink.h"
#include "media/base/fake_audio_worker.h"
#include "media/base/media_export.h"

namespace base {
class SingleThreadTaskRunner;
}

namespace media {

// Helper class for suspending AudioRenderSink instances after silence has been
// detected for some time. When this is detected, the provided |sink_| is paused
// and a fake sink is injected to black hole the silent audio data and avoid
// physical hardware usage. Note: The transition from real to fake audio output
// and vice versa may result in some irregular Render() callbacks.
class MEDIA_EXPORT SilentSinkSuspender
    : public AudioRendererSink::RenderCallback { … };

}  // namespace media

#endif  // MEDIA_BASE_SILENT_SINK_SUSPENDER_H_