| /* |
| * 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" |
| #include "bindings/core/v8/ExceptionMessages.h" |
| #include "bindings/core/v8/ExceptionState.h" |
| #include "core/dom/ExceptionCode.h" |
| #include "modules/webaudio/AudioNodeInput.h" |
| #include "modules/webaudio/AudioNodeOutput.h" |
| #include "modules/webaudio/BaseAudioContext.h" |
| #include "modules/webaudio/ChannelSplitterOptions.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(); |
| DCHECK(source); |
| DCHECK_EQ(framesToProcess, source->length()); |
| |
| unsigned numberOfSourceChannels = source->numberOfChannels(); |
| |
| for (unsigned i = 0; i < numberOfOutputs(); ++i) { |
| AudioBus* destination = output(i).bus(); |
| DCHECK(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(BaseAudioContext& context, |
| unsigned numberOfOutputs) |
| : AudioNode(context) { |
| setHandler(ChannelSplitterHandler::create(*this, context.sampleRate(), |
| numberOfOutputs)); |
| } |
| |
| ChannelSplitterNode* ChannelSplitterNode::create( |
| BaseAudioContext& context, |
| ExceptionState& exceptionState) { |
| DCHECK(isMainThread()); |
| |
| // Default number of outputs for the splitter node is 6. |
| return create(context, 6, exceptionState); |
| } |
| |
| ChannelSplitterNode* ChannelSplitterNode::create( |
| BaseAudioContext& context, |
| unsigned numberOfOutputs, |
| ExceptionState& exceptionState) { |
| DCHECK(isMainThread()); |
| |
| if (context.isContextClosed()) { |
| context.throwExceptionForClosedState(exceptionState); |
| return nullptr; |
| } |
| |
| if (!numberOfOutputs || |
| numberOfOutputs > BaseAudioContext::maxNumberOfChannels()) { |
| exceptionState.throwDOMException( |
| IndexSizeError, ExceptionMessages::indexOutsideRange<size_t>( |
| "number of outputs", numberOfOutputs, 1, |
| ExceptionMessages::InclusiveBound, |
| BaseAudioContext::maxNumberOfChannels(), |
| ExceptionMessages::InclusiveBound)); |
| return nullptr; |
| } |
| |
| return new ChannelSplitterNode(context, numberOfOutputs); |
| } |
| |
| ChannelSplitterNode* ChannelSplitterNode::create( |
| BaseAudioContext* context, |
| const ChannelSplitterOptions& options, |
| ExceptionState& exceptionState) { |
| ChannelSplitterNode* node = |
| create(*context, options.numberOfOutputs(), exceptionState); |
| |
| if (!node) |
| return nullptr; |
| |
| node->handleChannelOptions(options, exceptionState); |
| |
| return node; |
| } |
| |
| } // namespace blink |