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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "GainNode.h"
#include "mozilla/dom/GainNodeBinding.h"
#include "AlignmentUtils.h"
#include "AudioNodeEngine.h"
#include "AudioNodeTrack.h"
#include "AudioDestinationNode.h"
#include "WebAudioUtils.h"
#include "Tracing.h"
namespace mozilla::dom {
NS_IMPL_CYCLE_COLLECTION_INHERITED(GainNode, AudioNode, mGain)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(GainNode)
NS_INTERFACE_MAP_END_INHERITING(AudioNode)
NS_IMPL_ADDREF_INHERITED(GainNode, AudioNode)
NS_IMPL_RELEASE_INHERITED(GainNode, AudioNode)
class GainNodeEngine final : public AudioNodeEngine {
public:
GainNodeEngine(AudioNode* aNode, AudioDestinationNode* aDestination)
: AudioNodeEngine(aNode),
mDestination(aDestination->Track())
// Keep the default value in sync with the default value in
// GainNode::GainNode.
,
mGain(1.f) {}
enum Parameters { GAIN };
void RecvTimelineEvent(uint32_t aIndex, AudioParamEvent& aEvent) override {
MOZ_ASSERT(mDestination);
aEvent.ConvertToTicks(mDestination);
switch (aIndex) {
case GAIN:
mGain.InsertEvent<int64_t>(aEvent);
break;
default:
NS_ERROR("Bad GainNodeEngine TimelineParameter");
}
}
void ProcessBlock(AudioNodeTrack* aTrack, GraphTime aFrom,
const AudioBlock& aInput, AudioBlock* aOutput,
bool* aFinished) override {
TRACE("GainNodeEngine::ProcessBlock");
if (aInput.IsNull()) {
// If input is silent, so is the output
aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
} else if (mGain.HasSimpleValue()) {
// Optimize the case where we only have a single value set as the volume
float gain = mGain.GetValue();
if (gain == 0.0f) {
aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
} else {
*aOutput = aInput;
aOutput->mVolume *= gain;
}
} else {
// First, compute a vector of gains for each track tick based on the
// timeline at hand, and then for each channel, multiply the values
// in the buffer with the gain vector.
aOutput->AllocateChannels(aInput.ChannelCount());
// Compute the gain values for the duration of the input AudioChunk
TrackTime tick = mDestination->GraphTimeToTrackTime(aFrom);
float computedGain[WEBAUDIO_BLOCK_SIZE + 4];
float* alignedComputedGain = ALIGNED16(computedGain);
ASSERT_ALIGNED16(alignedComputedGain);
mGain.GetValuesAtTime(tick, alignedComputedGain, WEBAUDIO_BLOCK_SIZE);
for (size_t counter = 0; counter < WEBAUDIO_BLOCK_SIZE; ++counter) {
alignedComputedGain[counter] *= aInput.mVolume;
}
// Apply the gain to the output buffer
for (size_t channel = 0; channel < aOutput->ChannelCount(); ++channel) {
const float* inputBuffer =
static_cast<const float*>(aInput.mChannelData[channel]);
float* buffer = aOutput->ChannelFloatsForWrite(channel);
AudioBlockCopyChannelWithScale(inputBuffer, alignedComputedGain,
buffer);
}
}
}
size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override {
// Not owned:
// - mDestination - MediaTrackGraphImpl::CollectSizesForMemoryReport()
// accounts for mDestination.
// - mGain - Internal ref owned by AudioNode
return AudioNodeEngine::SizeOfExcludingThis(aMallocSizeOf);
}
size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override {
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
RefPtr<AudioNodeTrack> mDestination;
AudioParamTimeline mGain;
};
GainNode::GainNode(AudioContext* aContext)
: AudioNode(aContext, 2, ChannelCountMode::Max,
ChannelInterpretation::Speakers) {
mGain = CreateAudioParam(GainNodeEngine::GAIN, u"gain"_ns, 1.0f);
GainNodeEngine* engine = new GainNodeEngine(this, aContext->Destination());
mTrack = AudioNodeTrack::Create(
aContext, engine, AudioNodeTrack::NO_TRACK_FLAGS, aContext->Graph());
}
/* static */
already_AddRefed<GainNode> GainNode::Create(AudioContext& aAudioContext,
const GainOptions& aOptions,
ErrorResult& aRv) {
RefPtr<GainNode> audioNode = new GainNode(&aAudioContext);
audioNode->Initialize(aOptions, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
audioNode->Gain()->SetInitialValue(aOptions.mGain);
return audioNode.forget();
}
size_t GainNode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const {
size_t amount = AudioNode::SizeOfExcludingThis(aMallocSizeOf);
amount += mGain->SizeOfIncludingThis(aMallocSizeOf);
return amount;
}
size_t GainNode::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const {
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
JSObject* GainNode::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return GainNode_Binding::Wrap(aCx, this, aGivenProto);
}
} // namespace mozilla::dom
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