196 lines
6.4 KiB
C++
196 lines
6.4 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 "AnalyserNode.h"
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#include "AudioNodeInput.h"
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#include "AudioNodeOutput.h"
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#include <wtf/IsoMallocInlines.h>
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namespace WebCore {
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WTF_MAKE_ISO_ALLOCATED_IMPL(AnalyserNode);
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ExceptionOr<Ref<AnalyserNode>> AnalyserNode::create(BaseAudioContext& context, const AnalyserOptions& options)
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{
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auto analyser = adoptRef(*new AnalyserNode(context));
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auto result = analyser->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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result = analyser->setMinMaxDecibels(options.minDecibels, options.maxDecibels);
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if (result.hasException())
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return result.releaseException();
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result = analyser->setFftSize(options.fftSize);
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if (result.hasException())
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return result.releaseException();
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result = analyser->setSmoothingTimeConstant(options.smoothingTimeConstant);
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if (result.hasException())
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return result.releaseException();
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return analyser;
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}
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AnalyserNode::AnalyserNode(BaseAudioContext& context)
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: AudioBasicInspectorNode(context, NodeTypeAnalyser)
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{
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addOutput(1);
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initialize();
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}
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AnalyserNode::~AnalyserNode()
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{
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uninitialize();
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}
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void AnalyserNode::process(size_t framesToProcess)
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{
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AudioBus* outputBus = output(0)->bus();
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if (!isInitialized()) {
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outputBus->zero();
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return;
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}
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AudioBus* inputBus = input(0)->bus();
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// Give the analyser the audio which is passing through this AudioNode. This must always
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// be done so that the state of the Analyser reflects the current input.
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m_analyser.writeInput(inputBus, framesToProcess);
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if (!input(0)->isConnected()) {
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outputBus->zero();
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return;
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}
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// For in-place processing, our override of pullInputs() will just pass the audio data through unchanged if the channel count matches from input to output
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// (resulting in inputBus == outputBus). Otherwise, do an up-mix to stereo.
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if (inputBus != outputBus)
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outputBus->copyFrom(*inputBus);
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}
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ExceptionOr<void> AnalyserNode::setFftSize(unsigned size)
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{
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if (!m_analyser.setFftSize(size))
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return Exception { IndexSizeError, "fftSize must be power of 2 in the range 32 to 32768."_s };
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return { };
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}
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ExceptionOr<void> AnalyserNode::setMinMaxDecibels(double minDecibels, double maxDecibels)
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{
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if (maxDecibels <= minDecibels)
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return Exception { IndexSizeError, "minDecibels must be less than maxDecibels."_s };
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m_analyser.setMinDecibels(minDecibels);
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m_analyser.setMaxDecibels(maxDecibels);
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return { };
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}
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ExceptionOr<void> AnalyserNode::setMinDecibels(double k)
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{
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if (k >= maxDecibels())
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return Exception { IndexSizeError, "minDecibels must be less than maxDecibels."_s };
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m_analyser.setMinDecibels(k);
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return { };
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}
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ExceptionOr<void> AnalyserNode::setMaxDecibels(double k)
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{
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if (k <= minDecibels())
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return Exception { IndexSizeError, "maxDecibels must be greater than minDecibels."_s };
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m_analyser.setMaxDecibels(k);
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return { };
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}
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ExceptionOr<void> AnalyserNode::setSmoothingTimeConstant(double k)
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{
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if (k < 0 || k > 1)
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return Exception { IndexSizeError, "Smoothing time constant needs to be between 0 and 1."_s };
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m_analyser.setSmoothingTimeConstant(k);
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return { };
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}
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bool AnalyserNode::requiresTailProcessing() const
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{
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// Tail time is always non-zero so tail processing is required.
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return true;
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}
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void AnalyserNode::updatePullStatus()
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{
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ASSERT(context().isGraphOwner());
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if (output(0)->isConnected()) {
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// When an AudioBasicInspectorNode is connected to a downstream node, it
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// will get pulled by the downstream node, thus remove it from the context's
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// automatic pull list.
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if (m_needAutomaticPull) {
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context().removeAutomaticPullNode(*this);
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m_needAutomaticPull = false;
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}
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} else {
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unsigned numberOfInputConnections = input(0)->numberOfRenderingConnections();
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// When an AnalyserNode is not connected to any downstream node
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// while still connected from upstream node(s), add it to the context's
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// automatic pull list.
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//
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// But don't remove the AnalyserNode if there are no inputs
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// connected to the node. The node needs to be pulled so that the
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// internal state is updated with the correct input signal (of
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// zeroes).
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if (numberOfInputConnections && !m_needAutomaticPull) {
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context().addAutomaticPullNode(*this);
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m_needAutomaticPull = true;
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}
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}
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}
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bool AnalyserNode::propagatesSilence() const
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{
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// An AnalyserNode does actually propogate silence, but to get the
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// time and FFT data updated correctly, process() needs to be
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// called even if all the inputs are silent.
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return false;
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}
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double AnalyserNode::tailTime() const
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{
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return RealtimeAnalyser::MaxFFTSize / static_cast<double>(context().sampleRate());
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}
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} // namespace WebCore
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#endif // ENABLE(WEB_AUDIO)
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