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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 "modules/webaudio/ChannelSplitterNode.h"
#if ENABLE(WEB_AUDIO)
#include "modules/webaudio/AbstractAudioContext.h"
#include "modules/webaudio/AudioNodeInput.h"
#include "modules/webaudio/AudioNodeOutput.h"
namespace blink {
ChannelSplitterHandler::ChannelSplitterHandler(AudioNode& node, float sampleRate, unsigned numberOfOutputs)
: AudioHandler(NodeTypeChannelSplitter, node, sampleRate)
{
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();
}
PassRefPtr<ChannelSplitterHandler> ChannelSplitterHandler::create(AudioNode& node, float sampleRate, unsigned numberOfOutputs)
{
return adoptRef(new ChannelSplitterHandler(node, sampleRate, numberOfOutputs));
}
void ChannelSplitterHandler::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();
}
}
}
// ----------------------------------------------------------------
ChannelSplitterNode::ChannelSplitterNode(AbstractAudioContext& context, float sampleRate, unsigned numberOfOutputs)
: AudioNode(context)
{
setHandler(ChannelSplitterHandler::create(*this, sampleRate, numberOfOutputs));
}
ChannelSplitterNode* ChannelSplitterNode::create(AbstractAudioContext& context, float sampleRate, unsigned numberOfOutputs)
{
if (!numberOfOutputs || numberOfOutputs > AbstractAudioContext::maxNumberOfChannels())
return nullptr;
return new ChannelSplitterNode(context, sampleRate, numberOfOutputs);
}
} // namespace blink
#endif // ENABLE(WEB_AUDIO)
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