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/*
* Copyright (C) 2024 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(MEDIA_STREAM) && ENABLE(WEB_CODECS)
#include "ExceptionOr.h"
#include "MediaStreamTrack.h"
#include "ReadableStreamSource.h"
#include "RealtimeMediaSource.h"
#include "WebCodecsVideoFrame.h"
#include <wtf/TZoneMalloc.h>
namespace JSC {
class JSGlobaObject;
}
namespace WebCore {
class ReadableStream;
class ScriptExecutionContext;
class WebCodecsVideoFrame;
class MediaStreamTrackProcessor
: public RefCounted<MediaStreamTrackProcessor>
, public CanMakeWeakPtr<MediaStreamTrackProcessor>
, private ContextDestructionObserver {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED(MediaStreamTrackProcessor);
public:
struct Init {
RefPtr<MediaStreamTrack> track;
unsigned short maxBufferSize { 1 };
};
static ExceptionOr<Ref<MediaStreamTrackProcessor>> create(ScriptExecutionContext&, Init&&);
~MediaStreamTrackProcessor();
ExceptionOr<Ref<ReadableStream>> readable(JSC::JSGlobalObject&);
// Lives in ScriptExecutionContext only.
class Source final
: public ReadableStreamSource
, public MediaStreamTrackPrivateObserver {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED(Source);
public:
Source(Ref<MediaStreamTrackPrivate>&&, MediaStreamTrackProcessor&);
~Source();
bool isWaiting() const { return m_isWaiting; }
bool isCancelled() const { return m_isCancelled; }
void close();
void enqueue(WebCodecsVideoFrame&, ScriptExecutionContext&);
void ref() const final { m_processor->ref(); };
void deref() const final { m_processor->deref(); };
void setAsCancelled() { m_isCancelled = true; }
private:
// MediaStreamTrackPrivateObserver
void trackEnded(MediaStreamTrackPrivate&) final;
void trackMutedChanged(MediaStreamTrackPrivate&) final { }
void trackSettingsChanged(MediaStreamTrackPrivate&) final { }
void trackEnabledChanged(MediaStreamTrackPrivate&) final { }
// ReadableStreamSource
void setActive() { };
void setInactive() { };
void doStart() final;
void doPull() final;
void doCancel() final;
bool m_isWaiting { false };
bool m_isCancelled { false };
const Ref<MediaStreamTrackPrivate> m_privateTrack;
const WeakRef<MediaStreamTrackProcessor> m_processor;
};
using MediaStreamTrackProcessorSource = MediaStreamTrackProcessor::Source;
private:
MediaStreamTrackProcessor(ScriptExecutionContext&, Ref<MediaStreamTrack>&&, unsigned short maxVideoFramesCount);
// ContextDestructionObserver
void contextDestroyed() final;
void stopVideoFrameObserver();
void tryEnqueueingVideoFrame();
class VideoFrameObserver final : private RealtimeMediaSource::VideoFrameObserver {
WTF_MAKE_TZONE_ALLOCATED(VideoFrameObserver);
public:
explicit VideoFrameObserver(ScriptExecutionContextIdentifier, WeakPtr<MediaStreamTrackProcessor>&&, Ref<RealtimeMediaSource>&&, unsigned short maxVideoFramesCount);
~VideoFrameObserver();
void start();
RefPtr<WebCodecsVideoFrame> takeVideoFrame(ScriptExecutionContext&);
bool isContextThread() const { return ScriptExecutionContext::isContextThread(m_contextIdentifier); }
private:
// RealtimeMediaSource::VideoFrameObserver
void videoFrameAvailable(VideoFrame&, VideoFrameTimeMetadata) final;
bool m_isStarted WTF_GUARDED_BY_CAPABILITY(mainThread) { false };
RefPtr<RealtimeMediaSource> m_realtimeVideoSource WTF_GUARDED_BY_CAPABILITY(mainThread);
// Accessed on either thread
const ScriptExecutionContextIdentifier m_contextIdentifier;
const WeakPtr<MediaStreamTrackProcessor> m_processor;
Lock m_videoFramesLock;
Deque<Ref<VideoFrame>> m_videoFrames WTF_GUARDED_BY_LOCK(m_videoFramesLock);
const unsigned short m_maxVideoFramesCount { 1 };
};
class VideoFrameObserverWrapper : public ThreadSafeRefCounted<VideoFrameObserverWrapper, WTF::DestructionThread::Main> {
public:
static Ref<VideoFrameObserverWrapper> create(ScriptExecutionContextIdentifier, MediaStreamTrackProcessor&, Ref<RealtimeMediaSource>&&, unsigned short maxVideoFramesCount);
void start();
RefPtr<WebCodecsVideoFrame> takeVideoFrame(ScriptExecutionContext& context) { return m_observer->takeVideoFrame(context); }
private:
VideoFrameObserverWrapper(ScriptExecutionContextIdentifier, MediaStreamTrackProcessor&, Ref<RealtimeMediaSource>&&, unsigned short maxVideoFramesCount);
const UniqueRef<VideoFrameObserver> m_observer;
};
RefPtr<ReadableStream> m_readable;
std::unique_ptr<Source> m_readableStreamSource;
RefPtr<VideoFrameObserverWrapper> m_videoFrameObserverWrapper;
const Ref<MediaStreamTrack> m_track;
};
} // namespace WebCore
#endif // ENABLE(MEDIA_STREAM) && ENABLE(WEB_CODECS)
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