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72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/ChannelSplitterNode.h"
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#include "mozilla/dom/ChannelSplitterNodeBinding.h"
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#include "AudioNodeEngine.h"
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#include "AudioNodeStream.h"
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#include "mozilla/PodOperations.h"
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namespace mozilla {
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namespace dom {
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NS_IMPL_ISUPPORTS_INHERITED0(ChannelSplitterNode, AudioNode)
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class ChannelSplitterNodeEngine : public AudioNodeEngine
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{
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public:
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ChannelSplitterNodeEngine(ChannelSplitterNode* aNode)
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: AudioNodeEngine(aNode)
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{
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MOZ_ASSERT(NS_IsMainThread());
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}
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virtual void ProduceAudioBlocksOnPorts(AudioNodeStream* aStream,
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const OutputChunks& aInput,
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OutputChunks& aOutput,
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bool* aFinished) MOZ_OVERRIDE
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{
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MOZ_ASSERT(aInput.Length() == 1, "Should only have one input port");
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aOutput.SetLength(OutputCount());
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for (uint16_t i = 0; i < OutputCount(); ++i) {
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if (i < aInput[0].mChannelData.Length()) {
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// Split out existing channels
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AllocateAudioBlock(1, &aOutput[i]);
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AudioBlockCopyChannelWithScale(
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static_cast<const float*>(aInput[0].mChannelData[i]),
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aInput[0].mVolume,
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static_cast<float*>(const_cast<void*>(aOutput[i].mChannelData[0])));
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} else {
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// Pad with silent channels if needed
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aOutput[i].SetNull(WEBAUDIO_BLOCK_SIZE);
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}
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}
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}
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};
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ChannelSplitterNode::ChannelSplitterNode(AudioContext* aContext,
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uint16_t aOutputCount)
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: AudioNode(aContext,
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2,
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ChannelCountMode::Max,
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ChannelInterpretation::Speakers)
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, mOutputCount(aOutputCount)
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{
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mStream = aContext->Graph()->CreateAudioNodeStream(new ChannelSplitterNodeEngine(this),
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MediaStreamGraph::INTERNAL_STREAM);
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}
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JSObject*
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ChannelSplitterNode::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aScope)
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{
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return ChannelSplitterNodeBinding::Wrap(aCx, aScope, this);
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}
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}
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}
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