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