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