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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 "ChannelSplitterNode.h"
#include "AudioContext.h"
#include "AudioNodeInput.h"
#include "AudioNodeOutput.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(ChannelSplitterNode);
ExceptionOr<Ref<ChannelSplitterNode>> ChannelSplitterNode::create(BaseAudioContext& context, const ChannelSplitterOptions& options)
{
if (options.numberOfOutputs > AudioContext::maxNumberOfChannels || !options.numberOfOutputs)
return Exception { IndexSizeError, "Number of outputs is not in the allowed range"_s };
auto splitter = adoptRef(*new ChannelSplitterNode(context, options.numberOfOutputs));
auto result = splitter->handleAudioNodeOptions(options, { options.numberOfOutputs, ChannelCountMode::Explicit, ChannelInterpretation::Discrete });
if (result.hasException())
return result.releaseException();
return splitter;
}
ChannelSplitterNode::ChannelSplitterNode(BaseAudioContext& context, unsigned numberOfOutputs)
: AudioNode(context, NodeTypeChannelSplitter)
{
addInput();
// Create a fixed number of outputs (able to handle the maximum number of channels fed to an input).
for (unsigned i = 0; i < numberOfOutputs; ++i)
addOutput(1);
initialize();
}
void ChannelSplitterNode::process(size_t framesToProcess)
{
AudioBus* source = input(0)->bus();
ASSERT(source);
ASSERT_UNUSED(framesToProcess, framesToProcess == source->length());
unsigned numberOfSourceChannels = source->numberOfChannels();
for (unsigned i = 0; i < numberOfOutputs(); ++i) {
AudioBus* destination = output(i)->bus();
ASSERT(destination);
if (i < numberOfSourceChannels) {
// Split the channel out if it exists in the source.
// It would be nice to avoid the copy and simply pass along pointers, but this becomes extremely difficult with fanout and fanin.
destination->channel(0)->copyFrom(source->channel(i));
} else if (output(i)->renderingFanOutCount() > 0) {
// Only bother zeroing out the destination if it's connected to anything
destination->zero();
}
}
}
ExceptionOr<void> ChannelSplitterNode::setChannelCount(unsigned channelCount)
{
if (channelCount != numberOfOutputs())
return Exception { InvalidStateError, "Channel count must be set to number of outputs."_s };
return AudioNode::setChannelCount(channelCount);
}
ExceptionOr<void> ChannelSplitterNode::setChannelCountMode(ChannelCountMode mode)
{
if (mode != ChannelCountMode::Explicit)
return Exception { InvalidStateError, "Channel count mode cannot be changed from explicit."_s };
return AudioNode::setChannelCountMode(mode);
}
ExceptionOr<void> ChannelSplitterNode::setChannelInterpretation(ChannelInterpretation interpretation)
{
if (interpretation != ChannelInterpretation::Discrete)
return Exception { InvalidStateError, "Channel interpretation cannot be changed from discrete."_s };
return AudioNode::setChannelInterpretation(interpretation);
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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