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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(WEB_CODECS)
#include "ActiveDOMObject.h"
#include "EventTarget.h"
#include "WebCodecsCodecState.h"
#include <wtf/Deque.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/ThreadSafeWeakPtr.h>
namespace WebCore {
class WebCodecsControlMessage;
// WebCodecsBase implements the "Control Message Queue"
// as per https://w3c.github.io/webcodecs/#control-message-queue-slot
// And handle "Codec Saturation"
// as per https://w3c.github.io/webcodecs/#saturated
class WebCodecsBase
: public ThreadSafeRefCountedAndCanMakeThreadSafeWeakPtr<WebCodecsBase>
, public ActiveDOMObject
, public EventTarget {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED(WebCodecsBase);
public:
virtual ~WebCodecsBase();
WebCodecsCodecState state() const { return m_state; }
// ActiveDOMObject.
void ref() const final { ThreadSafeRefCountedAndCanMakeThreadSafeWeakPtr::ref(); }
void deref() const final { ThreadSafeRefCountedAndCanMakeThreadSafeWeakPtr::deref(); }
bool virtualHasPendingActivity() const final;
protected:
WebCodecsBase(ScriptExecutionContext&);
ScriptExecutionContext* scriptExecutionContext() const final { return ActiveDOMObject::scriptExecutionContext(); }
void setState(WebCodecsCodecState state) { m_state = state; }
size_t codecQueueSize() const { return m_codecControlMessagesPending; }
void queueControlMessageAndProcess(WebCodecsControlMessage&&);
void queueCodecControlMessageAndProcess(WebCodecsControlMessage&&);
void processControlMessageQueue();
void clearControlMessageQueue();
void clearControlMessageQueueAndMaybeScheduleDequeueEvent();
void blockControlMessageQueue();
void unblockControlMessageQueue();
virtual size_t maximumCodecOperationsEnqueued() const { return 1; }
void incrementCodecOperationCount() { m_codecOperationsPending++; };
void decrementCodecOperationCountAndMaybeProcessControlMessageQueue();
private:
// EventTarget
void refEventTarget() final { ref(); }
void derefEventTarget() final { deref(); }
// Equivalent to spec's "Increment [[encodeQueueSize]]." or "Increment [[decodeQueueSize]]"
void incrementCodecQueueSize();
// Equivalent to spec's "Decrement [[encodeQueueSize]] or "Decrement [[decodeQueueSize]]" and run the Schedule Dequeue Event algorithm"
void decrementCodecQueueSizeAndScheduleDequeueEvent();
bool isCodecSaturated() const { return m_codecOperationsPending >= maximumCodecOperationsEnqueued(); }
void scheduleDequeueEvent();
bool m_isMessageQueueBlocked { false };
size_t m_codecControlMessagesPending { 0 };
size_t m_codecOperationsPending { 0 };
bool m_dequeueEventScheduled { false };
Deque<WebCodecsControlMessage> m_controlMessageQueue;
WebCodecsCodecState m_state { WebCodecsCodecState::Unconfigured };
};
} // namespace WebCore
#endif // ENABLE(WEB_CODECS)
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