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79 lines
2.5 KiB
C++
79 lines
2.5 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/ChannelMergerNode.h"
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#include "mozilla/dom/ChannelMergerNodeBinding.h"
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#include "AudioNodeEngine.h"
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#include "AudioNodeStream.h"
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namespace mozilla {
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namespace dom {
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NS_IMPL_ISUPPORTS_INHERITED0(ChannelMergerNode, AudioNode)
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class ChannelMergerNodeEngine : public AudioNodeEngine
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{
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public:
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ChannelMergerNodeEngine(ChannelMergerNode* 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 have one or more input ports");
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// Get the number of output channels, and allocate it
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uint32_t channelCount = 0;
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for (uint16_t i = 0; i < InputCount(); ++i) {
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channelCount += aInput[i].mChannelData.Length();
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}
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if (channelCount == 0) {
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aOutput[0].SetNull(WEBAUDIO_BLOCK_SIZE);
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return;
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}
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AllocateAudioBlock(channelCount, &aOutput[0]);
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// Append each channel in each input to the output
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uint32_t channelIndex = 0;
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for (uint16_t i = 0; i < InputCount(); ++i) {
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for (uint32_t j = 0; j < aInput[i].mChannelData.Length(); ++j) {
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AudioBlockCopyChannelWithScale(
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static_cast<const float*>(aInput[i].mChannelData[j]),
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aInput[i].mVolume,
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static_cast<float*>(const_cast<void*>(aOutput[0].mChannelData[channelIndex])));
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++channelIndex;
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}
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}
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}
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};
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ChannelMergerNode::ChannelMergerNode(AudioContext* aContext,
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uint16_t aInputCount)
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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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, mInputCount(aInputCount)
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{
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mStream = aContext->Graph()->CreateAudioNodeStream(new ChannelMergerNodeEngine(this),
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MediaStreamGraph::INTERNAL_STREAM);
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}
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JSObject*
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ChannelMergerNode::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aScope)
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{
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return ChannelMergerNodeBinding::Wrap(aCx, aScope, this);
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}
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}
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}
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