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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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE 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 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 "ChannelMergerNode.h"
#include "AudioContext.h"
#include "AudioNodeInput.h"
#include "AudioNodeOutput.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(ChannelMergerNode);
ExceptionOr<Ref<ChannelMergerNode>> ChannelMergerNode::create(BaseAudioContext& context, const ChannelMergerOptions& options)
{
if (options.numberOfInputs > AudioContext::maxNumberOfChannels || !options.numberOfInputs)
return Exception { IndexSizeError, "Number of inputs is not in the allowed range."_s };
auto merger = adoptRef(*new ChannelMergerNode(context, options.numberOfInputs));
auto result = merger->handleAudioNodeOptions(options, { 1, ChannelCountMode::Explicit, ChannelInterpretation::Speakers });
if (result.hasException())
return result.releaseException();
return merger;
}
ChannelMergerNode::ChannelMergerNode(BaseAudioContext& context, unsigned numberOfInputs)
: AudioNode(context, NodeTypeChannelMerger)
{
// Create the requested number of inputs.
for (unsigned i = 0; i < numberOfInputs; ++i)
addInput();
addOutput(numberOfInputs);
initialize();
Locker contextLocker { context.graphLock() };
disableOutputs();
}
void ChannelMergerNode::process(size_t framesToProcess)
{
AudioNodeOutput* output = this->output(0);
ASSERT(output);
ASSERT_UNUSED(framesToProcess, framesToProcess == output->bus()->length());
ASSERT(numberOfInputs() == output->numberOfChannels());
// Merge all the channels from all the inputs into one output.
for (unsigned i = 0; i < numberOfInputs(); ++i) {
AudioNodeInput* input = this->input(i);
ASSERT(input->numberOfChannels() == 1u);
auto* outputChannel = output->bus()->channel(i);
if (input->isConnected()) {
// The mixing rules will be applied so multiple channels are down-
// mixed to mono (when the mixing rule is defined). Note that only
// the first channel will be taken for the undefined input channel
// layout.
//
// See:
// http://webaudio.github.io/web-audio-api/#channel-up-mixing-and-down-mixing
auto* inputChannel = input->bus()->channel(0);
outputChannel->copyFrom(inputChannel);
} else {
// If input is unconnected, fill zeros in the channel.
outputChannel->zero();
}
}
}
ExceptionOr<void> ChannelMergerNode::setChannelCount(unsigned channelCount)
{
if (channelCount != 1)
return Exception { InvalidStateError, "Channel count cannot be changed from 1."_s };
return AudioNode::setChannelCount(channelCount);
}
ExceptionOr<void> ChannelMergerNode::setChannelCountMode(ChannelCountMode mode)
{
if (mode != ChannelCountMode::Explicit)
return Exception { InvalidStateError, "Channel count mode cannot be changed from explicit."_s };
return AudioNode::setChannelCountMode(mode);
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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