125 lines
4.4 KiB
C++
125 lines
4.4 KiB
C++
/*
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* Copyright 2014 The Chromium Authors. All rights reserved.
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* Copyright (C) 2020 Apple 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''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "StereoPannerNode.h"
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#if ENABLE(WEB_AUDIO)
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#include "AudioBus.h"
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#include "AudioNodeInput.h"
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#include "AudioNodeOutput.h"
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#include "AudioUtilities.h"
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#include <wtf/IsoMallocInlines.h>
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namespace WebCore {
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WTF_MAKE_ISO_ALLOCATED_IMPL(StereoPannerNode);
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ExceptionOr<Ref<StereoPannerNode>> StereoPannerNode::create(BaseAudioContext& context, const StereoPannerOptions& options)
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{
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auto stereo = adoptRef(*new StereoPannerNode(context, options.pan));
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auto result = stereo->handleAudioNodeOptions(options, { 2, ChannelCountMode::ClampedMax, ChannelInterpretation::Speakers });
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if (result.hasException())
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return result.releaseException();
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return stereo;
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}
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StereoPannerNode::StereoPannerNode(BaseAudioContext& context, float pan)
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: AudioNode(context, NodeTypeStereoPanner)
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, m_pan(AudioParam::create(context, "pan"_s, pan, -1, 1, AutomationRate::ARate))
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, m_sampleAccurateValues(AudioUtilities::renderQuantumSize)
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{
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addInput();
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addOutput(2);
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initialize();
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}
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StereoPannerNode::~StereoPannerNode()
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{
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uninitialize();
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}
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void StereoPannerNode::process(size_t framesToProcess)
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{
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AudioBus* destination = output(0)->bus();
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if (!isInitialized() || !input(0)->isConnected()) {
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destination->zero();
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return;
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}
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AudioBus* source = input(0)->bus();
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if (!source) {
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destination->zero();
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return;
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}
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if (m_pan->hasSampleAccurateValues() && m_pan->automationRate() == AutomationRate::ARate) {
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float* panValues = m_sampleAccurateValues.data();
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m_pan->calculateSampleAccurateValues(panValues, framesToProcess);
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StereoPanner::panWithSampleAccurateValues(source, destination, panValues, framesToProcess);
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return;
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}
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// The pan value is not sample-accurate or not a-rate. In this case, we have
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// a fixed pan value for the render and just need to incorporate any inputs to
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// the value, if any.
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float panValue = m_pan->hasSampleAccurateValues() ? m_pan->finalValue() : m_pan->value();
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StereoPanner::panToTargetValue(source, destination, panValue, framesToProcess);
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}
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void StereoPannerNode::processOnlyAudioParams(size_t framesToProcess)
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{
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float values[AudioUtilities::renderQuantumSize];
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ASSERT(framesToProcess <= AudioUtilities::renderQuantumSize);
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m_pan->calculateSampleAccurateValues(values, framesToProcess);
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}
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ExceptionOr<void> StereoPannerNode::setChannelCount(unsigned channelCount)
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{
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if (channelCount > 2)
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return Exception { NotSupportedError, "StereoPannerNode's channelCount cannot be greater than 2."_s };
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return AudioNode::setChannelCount(channelCount);
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}
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ExceptionOr<void> StereoPannerNode::setChannelCountMode(ChannelCountMode mode)
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{
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if (mode == ChannelCountMode::Max)
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return Exception { NotSupportedError, "StereoPannerNode's channelCountMode cannot be max."_s };
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return AudioNode::setChannelCountMode(mode);
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}
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} // namespace WebCore
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#endif // ENABLE(WEB_AUDIO)
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