chromium/third_party/blink/renderer/modules/mediastream/webaudio_media_stream_audio_sink.h

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASTREAM_WEBAUDIO_MEDIA_STREAM_AUDIO_SINK_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASTREAM_WEBAUDIO_MEDIA_STREAM_AUDIO_SINK_H_

#include <stddef.h>

#include <memory>

#include "base/synchronization/lock.h"
#include "base/time/time.h"
#include "media/base/audio_converter.h"
#include "media/base/reentrancy_checker.h"
#include "third_party/blink/public/platform/modules/mediastream/web_media_stream_audio_sink.h"
#include "third_party/blink/public/platform/web_audio_source_provider.h"
#include "third_party/blink/public/platform/web_vector.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_component.h"

namespace media {
class AudioBus;
class AudioConverter;
class AudioFifo;
class AudioParameters;
}  // namespace media

namespace blink {

class WebAudioSourceProviderClient;

// WebAudioMediaStreamAudioSink provides a bridge between classes:
//     MediaStreamAudioTrack ---> WebAudioSourceProvider
//
// WebAudioMediaStreamAudioSink works as a sink to the MediaStreamAudioTrack
// and stores the capture data to a FIFO. When the media stream is connected to
// WebAudio MediaStreamAudioSourceNode as a source provider,
// MediaStreamAudioSourceNode will periodically call provideInput() to get the
// data from the FIFO.
//
// Most calls are protected by a lock.
class MODULES_EXPORT WebAudioMediaStreamAudioSink
    : public WebAudioSourceProvider,
      public media::AudioConverter::InputCallback,
      public WebMediaStreamAudioSink { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASTREAM_WEBAUDIO_MEDIA_STREAM_AUDIO_SINK_H_