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61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef PlayingRefChangeHandler_h__
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#define PlayingRefChangeHandler_h__
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#include "nsThreadUtils.h"
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#include "AudioNodeStream.h"
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namespace mozilla {
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namespace dom {
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template<class NodeType>
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class PlayingRefChangeHandler : public nsRunnable
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{
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public:
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enum ChangeType { ADDREF, RELEASE };
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PlayingRefChangeHandler(AudioNodeStream* aStream, ChangeType aChange)
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: mLastProcessedGraphUpdateIndex(aStream->GetProcessingGraphUpdateIndex())
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, mStream(aStream)
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, mChange(aChange)
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{
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}
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NS_IMETHOD Run()
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{
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nsRefPtr<NodeType> node;
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{
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// No need to keep holding the lock for the whole duration of this
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// function, since we're holding a strong reference to it, so if
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// we can obtain the reference, we will hold the node alive in
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// this function.
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MutexAutoLock lock(mStream->Engine()->NodeMutex());
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node = static_cast<NodeType*>(mStream->Engine()->Node());
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}
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if (node) {
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if (mChange == ADDREF) {
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node->mPlayingRef.Take(node);
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} else if (mChange == RELEASE &&
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node->AcceptPlayingRefRelease(mLastProcessedGraphUpdateIndex)) {
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node->mPlayingRef.Drop(node);
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}
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}
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return NS_OK;
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}
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private:
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int64_t mLastProcessedGraphUpdateIndex;
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nsRefPtr<AudioNodeStream> mStream;
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ChangeType mChange;
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};
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}
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}
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#endif
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