139 lines
5.2 KiB
C++
139 lines
5.2 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 "GainNode.h"
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#include "AudioBus.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 <wtf/IsoMallocInlines.h>
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namespace WebCore {
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WTF_MAKE_ISO_ALLOCATED_IMPL(GainNode);
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ExceptionOr<Ref<GainNode>> GainNode::create(BaseAudioContext& context, const GainOptions& options)
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{
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auto gainNode = adoptRef(*new GainNode(context));
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auto result = gainNode->handleAudioNodeOptions(options, { 2, ChannelCountMode::Max, ChannelInterpretation::Speakers });
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if (result.hasException())
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return result.releaseException();
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gainNode->gain().setValue(options.gain);
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return gainNode;
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}
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GainNode::GainNode(BaseAudioContext& context)
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: AudioNode(context, NodeTypeGain)
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, m_sampleAccurateGainValues(AudioUtilities::renderQuantumSize) // FIXME: can probably share temp buffer in context
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, m_gain(AudioParam::create(context, "gain"_s, 1.0, -FLT_MAX, FLT_MAX, AutomationRate::ARate))
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{
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addInput();
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addOutput(1);
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initialize();
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}
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void GainNode::process(size_t framesToProcess)
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{
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// FIXME: for some cases there is a nice optimization to avoid processing here, and let the gain change
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// happen in the summing junction input of the AudioNode we're connected to.
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// Then we can avoid all of the following:
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AudioBus* outputBus = output(0)->bus();
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ASSERT(outputBus);
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if (!isInitialized() || !input(0)->isConnected())
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outputBus->zero();
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else {
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AudioBus* inputBus = input(0)->bus();
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if (gain().hasSampleAccurateValues() && gain().automationRate() == AutomationRate::ARate) {
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// Apply sample-accurate gain scaling for precise envelopes, grain windows, etc.
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ASSERT(framesToProcess <= m_sampleAccurateGainValues.size());
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if (framesToProcess <= m_sampleAccurateGainValues.size()) {
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float* gainValues = m_sampleAccurateGainValues.data();
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gain().calculateSampleAccurateValues(gainValues, framesToProcess);
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outputBus->copyWithSampleAccurateGainValuesFrom(*inputBus, gainValues, framesToProcess);
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}
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} else {
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// Apply the gain with de-zippering into the output bus.
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float gain = this->gain().hasSampleAccurateValues() ? this->gain().finalValue() : this->gain().value();
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if (!gain) {
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// If the gain is 0 just zero the bus.
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outputBus->zero();
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} else
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outputBus->copyWithGainFrom(*inputBus, gain);
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}
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}
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}
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void GainNode::processOnlyAudioParams(size_t framesToProcess)
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{
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float values[AudioUtilities::renderQuantumSize];
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ASSERT(framesToProcess <= AudioUtilities::renderQuantumSize);
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m_gain->calculateSampleAccurateValues(values, framesToProcess);
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}
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// FIXME: this can go away when we do mixing with gain directly in summing junction of AudioNodeInput
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//
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// As soon as we know the channel count of our input, we can lazily initialize.
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// Sometimes this may be called more than once with different channel counts, in which case we must safely
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// uninitialize and then re-initialize with the new channel count.
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void GainNode::checkNumberOfChannelsForInput(AudioNodeInput* input)
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{
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ASSERT(context().isAudioThread() && context().isGraphOwner());
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ASSERT(input && input == this->input(0));
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if (input != this->input(0))
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return;
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unsigned numberOfChannels = input->numberOfChannels();
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if (isInitialized() && numberOfChannels != output(0)->numberOfChannels()) {
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// We're already initialized but the channel count has changed.
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uninitialize();
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}
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if (!isInitialized()) {
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// This will propagate the channel count to any nodes connected further downstream in the graph.
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output(0)->setNumberOfChannels(numberOfChannels);
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initialize();
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}
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AudioNode::checkNumberOfChannelsForInput(input);
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}
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} // namespace WebCore
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#endif // ENABLE(WEB_AUDIO)
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