132 lines
4.6 KiB
C++
132 lines
4.6 KiB
C++
/*
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* Copyright (C) 2010, Google Inc. All rights reserved.
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* Copyright (C) 2020-2021, Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#if ENABLE(WEB_AUDIO)
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#include "AudioDestinationNode.h"
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#include "AudioBus.h"
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#include "AudioContext.h"
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#include "AudioIOCallback.h"
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#include "AudioNodeInput.h"
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#include "AudioNodeOutput.h"
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#include "AudioUtilities.h"
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#include "AudioWorklet.h"
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#include "AudioWorkletGlobalScope.h"
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#include "AudioWorkletMessagingProxy.h"
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#include "AudioWorkletThread.h"
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#include "DenormalDisabler.h"
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#include <wtf/IsoMallocInlines.h>
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namespace WebCore {
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WTF_MAKE_ISO_ALLOCATED_IMPL(AudioDestinationNode);
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AudioDestinationNode::AudioDestinationNode(BaseAudioContext& context, float sampleRate)
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: AudioNode(context, NodeTypeDestination)
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, m_sampleRate(sampleRate)
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{
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addInput();
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}
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AudioDestinationNode::~AudioDestinationNode()
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{
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uninitialize();
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}
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void AudioDestinationNode::renderQuantum(AudioBus* destinationBus, size_t numberOfFrames, const AudioIOPosition& outputPosition)
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{
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// We don't want denormals slowing down any of the audio processing
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// since they can very seriously hurt performance.
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// This will take care of all AudioNodes because they all process within this scope.
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DenormalDisabler denormalDisabler;
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context().setAudioThread(Thread::current());
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// For performance reasons, we forbid heap allocations while doing rendering on the audio thread.
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// Heap allocations that cannot be avoided or have not been fixed yet can be allowed using
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// DisableMallocRestrictionsForCurrentThreadScope scope variables.
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ForbidMallocUseForCurrentThreadScope forbidMallocUse;
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if (!context().isInitialized()) {
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destinationBus->zero();
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return;
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}
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ASSERT(numberOfFrames);
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if (!numberOfFrames) {
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destinationBus->zero();
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return;
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}
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// Let the context take care of any business at the start of each render quantum.
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context().handlePreRenderTasks(outputPosition);
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RefPtr<AudioWorkletGlobalScope> workletGlobalScope;
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if (auto* audioWorkletProxy = context().audioWorklet().proxy())
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workletGlobalScope = audioWorkletProxy->workletThread().globalScope();
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if (workletGlobalScope)
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workletGlobalScope->handlePreRenderTasks();
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// This will cause the node(s) connected to us to process, which in turn will pull on their input(s),
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// all the way backwards through the rendering graph.
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AudioBus* renderedBus = input(0)->pull(destinationBus, numberOfFrames);
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if (!renderedBus)
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destinationBus->zero();
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else if (renderedBus != destinationBus) {
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// in-place processing was not possible - so copy
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destinationBus->copyFrom(*renderedBus);
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}
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// Process nodes which need a little extra help because they are not connected to anything, but still need to process.
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context().processAutomaticPullNodes(numberOfFrames);
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// Let the context take care of any business at the end of each render quantum.
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context().handlePostRenderTasks();
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// Advance current sample-frame.
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m_currentSampleFrame += numberOfFrames;
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if (workletGlobalScope)
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workletGlobalScope->handlePostRenderTasks(m_currentSampleFrame);
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}
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void AudioDestinationNode::ref()
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{
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context().ref();
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}
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void AudioDestinationNode::deref()
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{
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context().deref();
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}
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} // namespace WebCore
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#endif // ENABLE(WEB_AUDIO)
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