mirror of
https://github.com/classilla/tenfourfox.git
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153 lines
4.7 KiB
C++
153 lines
4.7 KiB
C++
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/* -*- 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 "AudioNodeStream.h"
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#include "AudioDestinationNode.h"
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#include "WebAudioUtils.h"
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namespace mozilla {
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namespace dom {
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NS_IMPL_CYCLE_COLLECTION_INHERITED(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 final : public AudioNodeEngine
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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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, mDestination(aDestination->Stream())
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// Keep the default value in sync with the default value in GainNode::GainNode.
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, mGain(1.f)
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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 RecvTimelineEvent(uint32_t aIndex,
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AudioTimelineEvent& aEvent) override
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{
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MOZ_ASSERT(mDestination);
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WebAudioUtils::ConvertAudioTimelineEventToTicks(aEvent,
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mDestination);
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switch (aIndex) {
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case GAIN:
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mGain.InsertEvent<int64_t>(aEvent);
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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 ProcessBlock(AudioNodeStream* aStream,
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GraphTime aFrom,
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const AudioBlock& aInput,
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AudioBlock* aOutput,
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bool* aFinished) override
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{
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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 if (mGain.HasSimpleValue()) {
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// Optimize the case where we only have a single value set as the volume
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float gain = mGain.GetValue();
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if (gain == 0.0f) {
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aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
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} else {
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*aOutput = aInput;
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aOutput->mVolume *= gain;
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}
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} else {
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// First, compute a vector of gains for each track tick based on the
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// timeline at hand, and then for each channel, multiply the values
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// in the buffer with the gain vector.
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aOutput->AllocateChannels(aInput.ChannelCount());
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// Compute the gain values for the duration of the input AudioChunk
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StreamTime tick = mDestination->GraphTimeToStreamTime(aFrom);
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float computedGain[WEBAUDIO_BLOCK_SIZE];
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mGain.GetValuesAtTime(tick, computedGain, WEBAUDIO_BLOCK_SIZE);
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for (size_t counter = 0; counter < WEBAUDIO_BLOCK_SIZE; ++counter) {
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computedGain[counter] *= aInput.mVolume;
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}
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// Apply the gain to the output buffer
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for (size_t channel = 0; channel < aOutput->ChannelCount(); ++channel) {
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const float* inputBuffer = static_cast<const float*> (aInput.mChannelData[channel]);
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float* buffer = aOutput->ChannelFloatsForWrite(channel);
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AudioBlockCopyChannelWithScale(inputBuffer, computedGain, buffer);
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}
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}
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}
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virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override
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{
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// Not owned:
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// - mDestination (probably)
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// - mGain - Internal ref owned by AudioNode
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return AudioNodeEngine::SizeOfExcludingThis(aMallocSizeOf);
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}
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virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override
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{
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return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
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}
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AudioNodeStream* mDestination;
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AudioParamTimeline mGain;
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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, GainNodeEngine::GAIN, 1.0f, "gain"))
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{
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GainNodeEngine* engine = new GainNodeEngine(this, aContext->Destination());
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mStream = AudioNodeStream::Create(aContext, engine,
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AudioNodeStream::NO_STREAM_FLAGS);
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}
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GainNode::~GainNode()
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{
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}
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size_t
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GainNode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
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{
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size_t amount = AudioNode::SizeOfExcludingThis(aMallocSizeOf);
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amount += mGain->SizeOfIncludingThis(aMallocSizeOf);
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return amount;
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}
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size_t
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GainNode::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
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{
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return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
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}
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JSObject*
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GainNode::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
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{
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return GainNodeBinding::Wrap(aCx, this, aGivenProto);
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}
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} // namespace dom
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} // namespace mozilla
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