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/*
* Copyright (C) 2017 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)
#include "CanvasBase.h"
#include "CanvasObserver.h"
#include "MediaStreamTrack.h"
#include "Timer.h"
#include <wtf/TypeCasts.h>
#include <wtf/WeakPtr.h>
namespace WebCore {
class Document;
class HTMLCanvasElement;
class Image;
class CanvasCaptureMediaStreamTrack final : public MediaStreamTrack {
WTF_MAKE_ISO_ALLOCATED(CanvasCaptureMediaStreamTrack);
public:
static Ref<CanvasCaptureMediaStreamTrack> create(Document&, Ref<HTMLCanvasElement>&&, std::optional<double>&& frameRequestRate);
HTMLCanvasElement& canvas() { return m_canvas.get(); }
void requestFrame() { static_cast<Source&>(source()).requestFrame(); }
RefPtr<MediaStreamTrack> clone() final;
private:
const char* activeDOMObjectName() const override;
class Source final : public RealtimeMediaSource, private CanvasObserver, private CanvasDisplayBufferObserver, public ThreadSafeRefCountedAndCanMakeThreadSafeWeakPtr<Source, WTF::DestructionThread::MainRunLoop> {
public:
static Ref<Source> create(HTMLCanvasElement&, std::optional<double>&& frameRequestRate);
void requestFrame() { m_shouldEmitFrame = true; }
std::optional<double> frameRequestRate() const { return m_frameRequestRate; }
void ref() const final { ThreadSafeRefCountedAndCanMakeThreadSafeWeakPtr<Source, WTF::DestructionThread::MainRunLoop>::ref(); }
void deref() const final { ThreadSafeRefCountedAndCanMakeThreadSafeWeakPtr<Source, WTF::DestructionThread::MainRunLoop>::deref(); }
ThreadSafeWeakPtrControlBlock& controlBlock() const final { return ThreadSafeRefCountedAndCanMakeThreadSafeWeakPtr<Source, WTF::DestructionThread::MainRunLoop>::controlBlock(); }
private:
Source(HTMLCanvasElement&, std::optional<double>&&);
// CanvasObserver overrides.
void canvasChanged(CanvasBase&, const std::optional<FloatRect>&) final;
void canvasResized(CanvasBase&) final;
void canvasDestroyed(CanvasBase&) final;
// CanvasDisplayBufferObserver overrides.
void canvasDisplayBufferPrepared(CanvasBase&) final;
// RealtimeMediaSource overrides.
void startProducingData() final;
void stopProducingData() final;
const RealtimeMediaSourceCapabilities& capabilities() final { return RealtimeMediaSourceCapabilities::emptyCapabilities(); }
const RealtimeMediaSourceSettings& settings() final;
void settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag>) final;
void scheduleCaptureCanvas();
void captureCanvas();
void requestFrameTimerFired();
bool m_shouldEmitFrame { true };
std::optional<double> m_frameRequestRate;
Timer m_requestFrameTimer;
Timer m_captureCanvasTimer;
std::optional<RealtimeMediaSourceSettings> m_currentSettings;
HTMLCanvasElement* m_canvas;
RefPtr<Image> m_currentImage;
};
CanvasCaptureMediaStreamTrack(Document&, Ref<HTMLCanvasElement>&&, Ref<Source>&&);
CanvasCaptureMediaStreamTrack(Document&, Ref<HTMLCanvasElement>&&, Ref<MediaStreamTrackPrivate>&&);
bool isCanvas() const final { return true; }
Ref<HTMLCanvasElement> m_canvas;
};
}
SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::CanvasCaptureMediaStreamTrack)
static bool isType(const WebCore::MediaStreamTrack& track) { return track.isCanvas(); }
SPECIALIZE_TYPE_TRAITS_END()
#endif // ENABLE(MEDIA_STREAM)
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