1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/ChannelMergerNode.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,88 @@
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/ChannelMergerNode.h"
1.11 +#include "mozilla/dom/ChannelMergerNodeBinding.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(ChannelMergerNode, AudioNode)
1.19 +
1.20 +class ChannelMergerNodeEngine : public AudioNodeEngine
1.21 +{
1.22 +public:
1.23 + ChannelMergerNodeEngine(ChannelMergerNode* 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 have one or more input ports");
1.35 +
1.36 + // Get the number of output channels, and allocate it
1.37 + uint32_t channelCount = 0;
1.38 + for (uint16_t i = 0; i < InputCount(); ++i) {
1.39 + channelCount += aInput[i].mChannelData.Length();
1.40 + }
1.41 + if (channelCount == 0) {
1.42 + aOutput[0].SetNull(WEBAUDIO_BLOCK_SIZE);
1.43 + return;
1.44 + }
1.45 + channelCount = std::min(channelCount, WebAudioUtils::MaxChannelCount);
1.46 + AllocateAudioBlock(channelCount, &aOutput[0]);
1.47 +
1.48 + // Append each channel in each input to the output
1.49 + uint32_t channelIndex = 0;
1.50 + for (uint16_t i = 0; true; ++i) {
1.51 + MOZ_ASSERT(i < InputCount());
1.52 + for (uint32_t j = 0; j < aInput[i].mChannelData.Length(); ++j) {
1.53 + AudioBlockCopyChannelWithScale(
1.54 + static_cast<const float*>(aInput[i].mChannelData[j]),
1.55 + aInput[i].mVolume,
1.56 + static_cast<float*>(const_cast<void*>(aOutput[0].mChannelData[channelIndex])));
1.57 + ++channelIndex;
1.58 + if (channelIndex >= channelCount) {
1.59 + return;
1.60 + }
1.61 + }
1.62 + }
1.63 + }
1.64 +
1.65 + virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE
1.66 + {
1.67 + return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
1.68 + }
1.69 +};
1.70 +
1.71 +ChannelMergerNode::ChannelMergerNode(AudioContext* aContext,
1.72 + uint16_t aInputCount)
1.73 + : AudioNode(aContext,
1.74 + 2,
1.75 + ChannelCountMode::Max,
1.76 + ChannelInterpretation::Speakers)
1.77 + , mInputCount(aInputCount)
1.78 +{
1.79 + mStream = aContext->Graph()->CreateAudioNodeStream(new ChannelMergerNodeEngine(this),
1.80 + MediaStreamGraph::INTERNAL_STREAM);
1.81 +}
1.82 +
1.83 +JSObject*
1.84 +ChannelMergerNode::WrapObject(JSContext* aCx)
1.85 +{
1.86 + return ChannelMergerNodeBinding::Wrap(aCx, this);
1.87 +}
1.88 +
1.89 +}
1.90 +}
1.91 +
