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102 lines
3.0 KiB
C++
102 lines
3.0 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 "GainNode.h"
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#include "mozilla/dom/GainNodeBinding.h"
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#include "AudioNodeEngine.h"
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#include "GainProcessor.h"
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namespace mozilla {
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namespace dom {
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NS_IMPL_CYCLE_COLLECTION_INHERITED_1(GainNode, AudioNode,
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mGain)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(GainNode)
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NS_INTERFACE_MAP_END_INHERITING(AudioNode)
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NS_IMPL_ADDREF_INHERITED(GainNode, AudioNode)
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NS_IMPL_RELEASE_INHERITED(GainNode, AudioNode)
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class GainNodeEngine : public AudioNodeEngine,
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public GainProcessor
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{
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public:
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GainNodeEngine(AudioNode* aNode, AudioDestinationNode* aDestination)
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: AudioNodeEngine(aNode)
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, GainProcessor(aDestination)
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{
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}
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enum Parameters {
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GAIN
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};
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void SetTimelineParameter(uint32_t aIndex,
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const AudioParamTimeline& aValue,
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TrackRate aSampleRate) MOZ_OVERRIDE
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{
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switch (aIndex) {
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case GAIN:
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SetGainParameter(aValue);
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break;
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default:
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NS_ERROR("Bad GainNodeEngine TimelineParameter");
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}
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}
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virtual void ProduceAudioBlock(AudioNodeStream* aStream,
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const AudioChunk& aInput,
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AudioChunk* aOutput,
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bool* aFinished)
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{
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MOZ_ASSERT(mSource == aStream, "Invalid source stream");
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if (aInput.IsNull()) {
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// If input is silent, so is the output
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aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
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} else {
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if (mGain.HasSimpleValue()) {
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// Copy the input chunk to the output chunk, since we will only be
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// changing the mVolume member.
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*aOutput = aInput;
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} else {
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// Create a new output chunk to avoid modifying the input chunk.
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AllocateAudioBlock(aInput.mChannelData.Length(), aOutput);
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}
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ProcessGain(aStream, aInput.mVolume, aInput.mChannelData, aOutput);
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}
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}
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};
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GainNode::GainNode(AudioContext* aContext)
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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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, mGain(new AudioParam(this, SendGainToStream, 1.0f))
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{
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GainNodeEngine* engine = new GainNodeEngine(this, aContext->Destination());
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mStream = aContext->Graph()->CreateAudioNodeStream(engine, MediaStreamGraph::INTERNAL_STREAM);
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engine->SetSourceStream(static_cast<AudioNodeStream*> (mStream.get()));
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}
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JSObject*
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GainNode::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aScope)
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{
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return GainNodeBinding::Wrap(aCx, aScope, this);
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}
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void
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GainNode::SendGainToStream(AudioNode* aNode)
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{
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GainNode* This = static_cast<GainNode*>(aNode);
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SendTimelineParameterToStream(This, GainNodeEngine::GAIN, *This->mGain);
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}
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}
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}
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