| /* |
| * 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) |