252 lines
7.2 KiB
C++
252 lines
7.2 KiB
C++
/*
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* Copyright (C) 2010, Google 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 "AudioNodeOutput.h"
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#include "AudioBus.h"
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#include "AudioContext.h"
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#include "AudioNodeInput.h"
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#include "AudioParam.h"
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#include "AudioUtilities.h"
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#include <wtf/Threading.h>
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namespace WebCore {
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AudioNodeOutput::AudioNodeOutput(AudioNode* node, unsigned numberOfChannels)
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: m_node(node)
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, m_numberOfChannels(numberOfChannels)
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, m_desiredNumberOfChannels(numberOfChannels)
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{
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ASSERT(numberOfChannels <= AudioContext::maxNumberOfChannels);
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m_internalBus = AudioBus::create(numberOfChannels, AudioUtilities::renderQuantumSize);
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}
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void AudioNodeOutput::setNumberOfChannels(unsigned numberOfChannels)
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{
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ASSERT(numberOfChannels <= AudioContext::maxNumberOfChannels);
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ASSERT(context().isGraphOwner());
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m_desiredNumberOfChannels = numberOfChannels;
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if (context().isAudioThread()) {
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// If we're in the audio thread then we can take care of it right away (we should be at the very start or end of a rendering quantum).
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updateNumberOfChannels();
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} else {
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// Let the context take care of it in the audio thread in the pre and post render tasks.
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context().markAudioNodeOutputDirty(this);
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}
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}
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void AudioNodeOutput::updateInternalBus()
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{
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if (numberOfChannels() == m_internalBus->numberOfChannels())
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return;
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// Heap allocations are forbidden on the audio thread for performance reasons so we need to
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// explicitly allow the following allocation(s).
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DisableMallocRestrictionsForCurrentThreadScope disableMallocRestrictions;
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m_internalBus = AudioBus::create(numberOfChannels(), AudioUtilities::renderQuantumSize);
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}
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void AudioNodeOutput::updateRenderingState()
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{
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updateNumberOfChannels();
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m_renderingFanOutCount = fanOutCount();
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m_renderingParamFanOutCount = paramFanOutCount();
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}
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void AudioNodeOutput::updateNumberOfChannels()
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{
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ASSERT(context().isAudioThread() && context().isGraphOwner());
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if (m_numberOfChannels != m_desiredNumberOfChannels) {
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m_numberOfChannels = m_desiredNumberOfChannels;
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updateInternalBus();
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propagateChannelCount();
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}
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}
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void AudioNodeOutput::propagateChannelCount()
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{
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ASSERT(context().isAudioThread() && context().isGraphOwner());
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if (isChannelCountKnown()) {
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// Announce to any nodes we're connected to that we changed our channel count for its input.
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for (auto& input : m_inputs.keys()) {
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AudioNode* connectionNode = input->node();
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connectionNode->checkNumberOfChannelsForInput(input);
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}
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}
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}
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AudioBus* AudioNodeOutput::pull(AudioBus* inPlaceBus, size_t framesToProcess)
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{
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ASSERT(context().isAudioThread());
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ASSERT(m_renderingFanOutCount > 0 || m_renderingParamFanOutCount > 0);
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// Causes our AudioNode to process if it hasn't already for this render quantum.
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// We try to do in-place processing (using inPlaceBus) if at all possible,
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// but we can't process in-place if we're connected to more than one input (fan-out > 1).
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// In this case pull() is called multiple times per rendering quantum, and the processIfNecessary() call below will
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// cause our node to process() only the first time, caching the output in m_internalOutputBus for subsequent calls.
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m_isInPlace = inPlaceBus && inPlaceBus->numberOfChannels() == numberOfChannels() && (m_renderingFanOutCount + m_renderingParamFanOutCount) == 1;
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m_inPlaceBus = m_isInPlace ? inPlaceBus : 0;
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node()->processIfNecessary(framesToProcess);
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return bus();
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}
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AudioBus* AudioNodeOutput::bus() const
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{
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ASSERT(const_cast<AudioNodeOutput*>(this)->context().isAudioThread());
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return m_isInPlace ? m_inPlaceBus.get() : m_internalBus.get();
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}
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unsigned AudioNodeOutput::fanOutCount()
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{
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ASSERT(context().isGraphOwner());
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return m_inputs.size();
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}
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unsigned AudioNodeOutput::paramFanOutCount()
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{
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ASSERT(context().isGraphOwner());
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return m_params.size();
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}
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unsigned AudioNodeOutput::renderingFanOutCount() const
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{
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return m_renderingFanOutCount;
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}
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unsigned AudioNodeOutput::renderingParamFanOutCount() const
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{
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return m_renderingParamFanOutCount;
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}
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void AudioNodeOutput::addInput(AudioNodeInput* input)
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{
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ASSERT(context().isGraphOwner());
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ASSERT(input);
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if (!input)
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return;
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m_inputs.add(input, input->node());
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}
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void AudioNodeOutput::removeInput(AudioNodeInput* input)
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{
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ASSERT(context().isGraphOwner());
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ASSERT(input);
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if (!input)
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return;
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m_inputs.remove(input);
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}
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void AudioNodeOutput::disconnectAllInputs()
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{
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ASSERT(context().isGraphOwner());
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// AudioNodeInput::disconnect() changes m_inputs by calling removeInput().
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while (!m_inputs.isEmpty()) {
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AudioNodeInput* input = m_inputs.begin()->key;
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input->disconnect(this);
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}
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}
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void AudioNodeOutput::addParam(AudioParam* param)
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{
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ASSERT(context().isGraphOwner());
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ASSERT(param);
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if (!param)
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return;
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m_params.add(param);
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}
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void AudioNodeOutput::removeParam(AudioParam* param)
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{
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ASSERT(context().isGraphOwner());
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ASSERT(param);
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if (!param)
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return;
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m_params.remove(param);
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}
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void AudioNodeOutput::disconnectAllParams()
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{
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ASSERT(context().isGraphOwner());
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// AudioParam::disconnect() changes m_params by calling removeParam().
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while (!m_params.isEmpty()) {
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AudioParam* param = m_params.begin()->get();
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param->disconnect(this);
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}
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}
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void AudioNodeOutput::disconnectAll()
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{
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disconnectAllInputs();
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disconnectAllParams();
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}
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void AudioNodeOutput::disable()
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{
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ASSERT(context().isGraphOwner());
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if (m_isEnabled) {
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for (auto& input : m_inputs.keys())
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input->disable(this);
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m_isEnabled = false;
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}
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}
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void AudioNodeOutput::enable()
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{
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ASSERT(context().isGraphOwner());
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if (!m_isEnabled) {
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for (auto& input : m_inputs.keys())
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input->enable(this);
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m_isEnabled = true;
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}
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}
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} // namespace WebCore
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#endif // ENABLE(WEB_AUDIO)
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