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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// 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_PLATFORM_MEDIASTREAM_WEBAUDIO_MEDIA_STREAM_SOURCE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEDIASTREAM_WEBAUDIO_MEDIA_STREAM_SOURCE_H_
#include <memory>
#include "base/time/time.h"
#include "media/base/audio_bus.h"
#include "media/base/audio_push_fifo.h"
#include "third_party/blink/public/platform/web_media_stream_source.h"
#include "third_party/blink/public/platform/web_vector.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_audio_source.h"
#include "third_party/blink/renderer/platform/mediastream/webaudio_destination_consumer.h"
#include "third_party/blink/renderer/platform/platform_export.h"
namespace blink {
// Implements the WebAudioDestinationConsumer interface to provide a source of
// audio data (i.e., the output from a graph of WebAudio nodes) to one or more
// MediaStreamAudioTracks. Audio data is transported directly to the tracks in
// 10 ms chunks.
class PLATFORM_EXPORT WebAudioMediaStreamSource final
: public MediaStreamAudioSource,
public WebAudioDestinationConsumer {
public:
WebAudioMediaStreamSource(
WebMediaStreamSource* blink_source,
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
~WebAudioMediaStreamSource() override;
private:
// WebAudioDestinationConsumer implementation.
//
// Note: Blink ensures setFormat() and consumeAudio() are not called
// concurrently across threads, but these methods could be called on any
// thread.
void SetFormat(size_t number_of_channels, float sample_rate) override;
void ConsumeAudio(const Vector<const float*>& audio_data,
size_t number_of_frames) override;
// Called by AudioPushFifo zero or more times during the call to
// consumeAudio(). Delivers audio data with the required buffer size to the
// tracks.
void DeliverRebufferedAudio(const media::AudioBus& audio_bus,
int frame_delay);
// MediaStreamAudioSource implementation.
bool EnsureSourceIsStarted() final;
void EnsureSourceIsStopped() final;
// In debug builds, check that all methods that could cause object graph
// or data flow changes are being called on the main thread.
THREAD_CHECKER(thread_checker_);
// True while this WebAudioMediaStreamSource is registered with
// |blink_source_| and is consuming audio.
bool is_registered_consumer_;
// A wrapper used for providing audio to |fifo_|.
std::unique_ptr<media::AudioBus> wrapper_bus_;
// Takes in the audio data passed to consumeAudio() and re-buffers it into 10
// ms chunks for the tracks. This ensures each chunk of audio delivered to
// the tracks has the required buffer size, regardless of the amount of audio
// provided via each consumeAudio() call.
media::AudioPushFifo fifo_;
// Used to pass the reference timestamp between DeliverDecodedAudio() and
// DeliverRebufferedAudio().
base::TimeTicks current_reference_time_;
// This object registers with a WebMediaStreamSource. We keep track of
// that in order to be able to deregister before stopping this source.
WebMediaStreamSource blink_source_;
DISALLOW_COPY_AND_ASSIGN(WebAudioMediaStreamSource);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEDIASTREAM_WEBAUDIO_MEDIA_STREAM_SOURCE_H_
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