116 lines
4.5 KiB
C++
116 lines
4.5 KiB
C++
/*
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* Copyright (C) 2010, Google 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'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#if ENABLE(WEB_AUDIO)
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#include "ChannelSplitterNode.h"
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#include "AudioContext.h"
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#include "AudioNodeInput.h"
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#include "AudioNodeOutput.h"
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#include <wtf/IsoMallocInlines.h>
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namespace WebCore {
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WTF_MAKE_ISO_ALLOCATED_IMPL(ChannelSplitterNode);
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ExceptionOr<Ref<ChannelSplitterNode>> ChannelSplitterNode::create(BaseAudioContext& context, const ChannelSplitterOptions& options)
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{
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if (options.numberOfOutputs > AudioContext::maxNumberOfChannels || !options.numberOfOutputs)
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return Exception { IndexSizeError, "Number of outputs is not in the allowed range"_s };
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auto splitter = adoptRef(*new ChannelSplitterNode(context, options.numberOfOutputs));
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auto result = splitter->handleAudioNodeOptions(options, { options.numberOfOutputs, ChannelCountMode::Explicit, ChannelInterpretation::Discrete });
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if (result.hasException())
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return result.releaseException();
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return splitter;
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}
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ChannelSplitterNode::ChannelSplitterNode(BaseAudioContext& context, unsigned numberOfOutputs)
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: AudioNode(context, NodeTypeChannelSplitter)
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{
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addInput();
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// Create a fixed number of outputs (able to handle the maximum number of channels fed to an input).
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for (unsigned i = 0; i < numberOfOutputs; ++i)
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addOutput(1);
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initialize();
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}
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void ChannelSplitterNode::process(size_t framesToProcess)
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{
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AudioBus* source = input(0)->bus();
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ASSERT(source);
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ASSERT_UNUSED(framesToProcess, framesToProcess == source->length());
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unsigned numberOfSourceChannels = source->numberOfChannels();
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for (unsigned i = 0; i < numberOfOutputs(); ++i) {
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AudioBus* destination = output(i)->bus();
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ASSERT(destination);
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if (i < numberOfSourceChannels) {
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// Split the channel out if it exists in the source.
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// It would be nice to avoid the copy and simply pass along pointers, but this becomes extremely difficult with fanout and fanin.
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destination->channel(0)->copyFrom(source->channel(i));
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} else if (output(i)->renderingFanOutCount() > 0) {
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// Only bother zeroing out the destination if it's connected to anything
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destination->zero();
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}
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}
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}
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ExceptionOr<void> ChannelSplitterNode::setChannelCount(unsigned channelCount)
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{
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if (channelCount != numberOfOutputs())
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return Exception { InvalidStateError, "Channel count must be set to number of outputs."_s };
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return AudioNode::setChannelCount(channelCount);
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}
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ExceptionOr<void> ChannelSplitterNode::setChannelCountMode(ChannelCountMode mode)
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{
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if (mode != ChannelCountMode::Explicit)
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return Exception { InvalidStateError, "Channel count mode cannot be changed from explicit."_s };
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return AudioNode::setChannelCountMode(mode);
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}
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ExceptionOr<void> ChannelSplitterNode::setChannelInterpretation(ChannelInterpretation interpretation)
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{
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if (interpretation != ChannelInterpretation::Discrete)
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return Exception { InvalidStateError, "Channel interpretation cannot be changed from discrete."_s };
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return AudioNode::setChannelInterpretation(interpretation);
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}
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} // namespace WebCore
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#endif // ENABLE(WEB_AUDIO)
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