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/*
* Copyright 2016 The Chromium Authors. All rights reserved.
* Copyright (C) 2020 Apple 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 "ConstantSourceNode.h"
#include "AudioNodeOutput.h"
#include "AudioParam.h"
#include "AudioUtilities.h"
#include "ConstantSourceOptions.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(ConstantSourceNode);
ExceptionOr<Ref<ConstantSourceNode>> ConstantSourceNode::create(BaseAudioContext& context, const ConstantSourceOptions& options)
{
auto node = adoptRef(*new ConstantSourceNode(context, options.offset));
node->suspendIfNeeded();
return node;
}
ConstantSourceNode::ConstantSourceNode(BaseAudioContext& context, float offset)
: AudioScheduledSourceNode(context, NodeTypeConstant)
, m_offset(AudioParam::create(context, "offset"_s, offset, -FLT_MAX, FLT_MAX, AutomationRate::ARate))
, m_sampleAccurateValues(AudioUtilities::renderQuantumSize)
{
addOutput(1);
initialize();
}
ConstantSourceNode::~ConstantSourceNode()
{
uninitialize();
}
void ConstantSourceNode::process(size_t framesToProcess)
{
auto& outputBus = *output(0)->bus();
if (!isInitialized() || !outputBus.numberOfChannels()) {
outputBus.zero();
return;
}
size_t quantumFrameOffset = 0;
size_t nonSilentFramesToProcess = 0;
double startFrameOffset = 0;
updateSchedulingInfo(framesToProcess, outputBus, quantumFrameOffset, nonSilentFramesToProcess, startFrameOffset);
if (!nonSilentFramesToProcess) {
outputBus.zero();
return;
}
bool isSampleAccurate = m_offset->hasSampleAccurateValues();
if (isSampleAccurate && m_offset->automationRate() == AutomationRate::ARate) {
float* offsets = m_sampleAccurateValues.data();
m_offset->calculateSampleAccurateValues(offsets, framesToProcess);
if (nonSilentFramesToProcess > 0) {
memcpy(outputBus.channel(0)->mutableData() + quantumFrameOffset, offsets + quantumFrameOffset, nonSilentFramesToProcess * sizeof(*offsets));
outputBus.clearSilentFlag();
} else
outputBus.zero();
return;
}
float value = isSampleAccurate ? m_offset->finalValue() : m_offset->value();
if (!value)
outputBus.zero();
else {
float* dest = outputBus.channel(0)->mutableData();
std::fill_n(dest + quantumFrameOffset, nonSilentFramesToProcess, value);
outputBus.clearSilentFlag();
}
}
bool ConstantSourceNode::propagatesSilence() const
{
return !isPlayingOrScheduled() || hasFinished();
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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