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/*
* Copyright (C) 2010, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(WEB_AUDIO)
#include "AnalyserNode.h"
#include "AudioNodeInput.h"
#include "AudioNodeOutput.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_IMPL(AnalyserNode);
ExceptionOr<Ref<AnalyserNode>> AnalyserNode::create(BaseAudioContext& context, const AnalyserOptions& options)
{
auto analyser = adoptRef(*new AnalyserNode(context));
auto result = analyser->handleAudioNodeOptions(options, { 2, ChannelCountMode::Max, ChannelInterpretation::Speakers });
if (result.hasException())
return result.releaseException();
result = analyser->setMinMaxDecibels(options.minDecibels, options.maxDecibels);
if (result.hasException())
return result.releaseException();
result = analyser->setFftSize(options.fftSize);
if (result.hasException())
return result.releaseException();
result = analyser->setSmoothingTimeConstant(options.smoothingTimeConstant);
if (result.hasException())
return result.releaseException();
return analyser;
}
AnalyserNode::AnalyserNode(BaseAudioContext& context)
: AudioBasicInspectorNode(context, NodeTypeAnalyser)
, m_analyser { context.noiseInjectionPolicies() }
{
addOutput(1);
initialize();
}
AnalyserNode::~AnalyserNode()
{
uninitialize();
}
void AnalyserNode::process(size_t framesToProcess)
{
AudioBus* outputBus = output(0)->bus();
if (!isInitialized()) {
outputBus->zero();
return;
}
AudioBus* inputBus = input(0)->bus();
// Give the analyser the audio which is passing through this AudioNode. This must always
// be done so that the state of the Analyser reflects the current input.
m_analyser.writeInput(inputBus, framesToProcess);
if (!input(0)->isConnected()) {
outputBus->zero();
return;
}
// 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
// (resulting in inputBus == outputBus). Otherwise, do an up-mix to stereo.
if (inputBus != outputBus)
outputBus->copyFrom(*inputBus);
}
ExceptionOr<void> AnalyserNode::setFftSize(unsigned size)
{
if (!m_analyser.setFftSize(size))
return Exception { ExceptionCode::IndexSizeError, "fftSize must be power of 2 in the range 32 to 32768."_s };
return { };
}
ExceptionOr<void> AnalyserNode::setMinMaxDecibels(double minDecibels, double maxDecibels)
{
if (maxDecibels <= minDecibels)
return Exception { ExceptionCode::IndexSizeError, "minDecibels must be less than maxDecibels."_s };
m_analyser.setMinDecibels(minDecibels);
m_analyser.setMaxDecibels(maxDecibels);
return { };
}
ExceptionOr<void> AnalyserNode::setMinDecibels(double k)
{
if (k >= maxDecibels())
return Exception { ExceptionCode::IndexSizeError, "minDecibels must be less than maxDecibels."_s };
m_analyser.setMinDecibels(k);
return { };
}
ExceptionOr<void> AnalyserNode::setMaxDecibels(double k)
{
if (k <= minDecibels())
return Exception { ExceptionCode::IndexSizeError, "maxDecibels must be greater than minDecibels."_s };
m_analyser.setMaxDecibels(k);
return { };
}
ExceptionOr<void> AnalyserNode::setSmoothingTimeConstant(double k)
{
if (k < 0 || k > 1)
return Exception { ExceptionCode::IndexSizeError, "Smoothing time constant needs to be between 0 and 1."_s };
m_analyser.setSmoothingTimeConstant(k);
return { };
}
bool AnalyserNode::requiresTailProcessing() const
{
// Tail time is always non-zero so tail processing is required.
return true;
}
void AnalyserNode::updatePullStatus()
{
ASSERT(context().isGraphOwner());
if (output(0)->isConnected()) {
// When an AudioBasicInspectorNode is connected to a downstream node, it
// will get pulled by the downstream node, thus remove it from the context's
// automatic pull list.
if (m_needAutomaticPull) {
context().removeAutomaticPullNode(*this);
m_needAutomaticPull = false;
}
} else {
unsigned numberOfInputConnections = input(0)->numberOfRenderingConnections();
// When an AnalyserNode is not connected to any downstream node
// while still connected from upstream node(s), add it to the context's
// automatic pull list.
//
// But don't remove the AnalyserNode if there are no inputs
// connected to the node. The node needs to be pulled so that the
// internal state is updated with the correct input signal (of
// zeroes).
if (numberOfInputConnections && !m_needAutomaticPull) {
context().addAutomaticPullNode(*this);
m_needAutomaticPull = true;
}
}
}
bool AnalyserNode::propagatesSilence() const
{
// An AnalyserNode does actually propogate silence, but to get the
// time and FFT data updated correctly, process() needs to be
// called even if all the inputs are silent.
return false;
}
double AnalyserNode::tailTime() const
{
return RealtimeAnalyser::MaxFFTSize / static_cast<double>(context().sampleRate());
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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