1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/ChannelSplitterNode.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,75 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim:set ts=2 sw=2 sts=2 et cindent: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "mozilla/dom/ChannelSplitterNode.h"
1.11 +#include "mozilla/dom/ChannelSplitterNodeBinding.h"
1.12 +#include "AudioNodeEngine.h"
1.13 +#include "AudioNodeStream.h"
1.14 +
1.15 +namespace mozilla {
1.16 +namespace dom {
1.17 +
1.18 +NS_IMPL_ISUPPORTS_INHERITED0(ChannelSplitterNode, AudioNode)
1.19 +
1.20 +class ChannelSplitterNodeEngine : public AudioNodeEngine
1.21 +{
1.22 +public:
1.23 + ChannelSplitterNodeEngine(ChannelSplitterNode* aNode)
1.24 + : AudioNodeEngine(aNode)
1.25 + {
1.26 + MOZ_ASSERT(NS_IsMainThread());
1.27 + }
1.28 +
1.29 + virtual void ProcessBlocksOnPorts(AudioNodeStream* aStream,
1.30 + const OutputChunks& aInput,
1.31 + OutputChunks& aOutput,
1.32 + bool* aFinished) MOZ_OVERRIDE
1.33 + {
1.34 + MOZ_ASSERT(aInput.Length() == 1, "Should only have one input port");
1.35 +
1.36 + aOutput.SetLength(OutputCount());
1.37 + for (uint16_t i = 0; i < OutputCount(); ++i) {
1.38 + if (i < aInput[0].mChannelData.Length()) {
1.39 + // Split out existing channels
1.40 + AllocateAudioBlock(1, &aOutput[i]);
1.41 + AudioBlockCopyChannelWithScale(
1.42 + static_cast<const float*>(aInput[0].mChannelData[i]),
1.43 + aInput[0].mVolume,
1.44 + static_cast<float*>(const_cast<void*>(aOutput[i].mChannelData[0])));
1.45 + } else {
1.46 + // Pad with silent channels if needed
1.47 + aOutput[i].SetNull(WEBAUDIO_BLOCK_SIZE);
1.48 + }
1.49 + }
1.50 + }
1.51 +
1.52 + virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE
1.53 + {
1.54 + return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
1.55 + }
1.56 +};
1.57 +
1.58 +ChannelSplitterNode::ChannelSplitterNode(AudioContext* aContext,
1.59 + uint16_t aOutputCount)
1.60 + : AudioNode(aContext,
1.61 + 2,
1.62 + ChannelCountMode::Max,
1.63 + ChannelInterpretation::Speakers)
1.64 + , mOutputCount(aOutputCount)
1.65 +{
1.66 + mStream = aContext->Graph()->CreateAudioNodeStream(new ChannelSplitterNodeEngine(this),
1.67 + MediaStreamGraph::INTERNAL_STREAM);
1.68 +}
1.69 +
1.70 +JSObject*
1.71 +ChannelSplitterNode::WrapObject(JSContext* aCx)
1.72 +{
1.73 + return ChannelSplitterNodeBinding::Wrap(aCx, this);
1.74 +}
1.75 +
1.76 +}
1.77 +}
1.78 +
