110 lines
3.9 KiB
C++
110 lines
3.9 KiB
C++
/*
|
|
* 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)
|
|
{
|
|
return adoptRef(*new ConstantSourceNode(context, options.offset));
|
|
}
|
|
|
|
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)
|