| /* |
| * 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) |