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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 "StereoPannerNode.h"
#include "mozilla/dom/StereoPannerNodeBinding.h"
#include "AudioNodeEngine.h"
#include "AudioNodeStream.h"
#include "AudioDestinationNode.h"
#include "AlignmentUtils.h"
#include "WebAudioUtils.h"
#include "PanningUtils.h"
#include "AudioParamTimeline.h"
#include "AudioParam.h"
namespace mozilla {
namespace dom {
using namespace std;
NS_IMPL_CYCLE_COLLECTION_INHERITED(StereoPannerNode, AudioNode, mPan)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(StereoPannerNode)
NS_INTERFACE_MAP_END_INHERITING(AudioNode)
NS_IMPL_ADDREF_INHERITED(StereoPannerNode, AudioNode)
NS_IMPL_RELEASE_INHERITED(StereoPannerNode, AudioNode)
class StereoPannerNodeEngine final : public AudioNodeEngine
{
public:
StereoPannerNodeEngine(AudioNode* aNode,
AudioDestinationNode* aDestination)
: AudioNodeEngine(aNode)
, mDestination(aDestination->Stream())
// Keep the default value in sync with the default value in
// StereoPannerNode::StereoPannerNode.
, mPan(0.f)
{
}
enum Parameters {
PAN
};
void RecvTimelineEvent(uint32_t aIndex,
AudioTimelineEvent& aEvent) override
{
MOZ_ASSERT(mDestination);
WebAudioUtils::ConvertAudioTimelineEventToTicks(aEvent,
mDestination);
switch (aIndex) {
case PAN:
mPan.InsertEvent<int64_t>(aEvent);
break;
default:
NS_ERROR("Bad StereoPannerNode TimelineParameter");
}
}
void GetGainValuesForPanning(float aPanning,
bool aMonoToStereo,
float& aLeftGain,
float& aRightGain)
{
// Clamp and normalize the panning in [0; 1]
aPanning = std::min(std::max(aPanning, -1.f), 1.f);
if (aMonoToStereo) {
aPanning += 1;
aPanning /= 2;
} else if (aPanning <= 0) {
aPanning += 1;
}
aLeftGain = cos(0.5 * M_PI * aPanning);
aRightGain = sin(0.5 * M_PI * aPanning);
}
void SetToSilentStereoBlock(AudioBlock* aChunk)
{
for (uint32_t channel = 0; channel < 2; channel++) {
float* samples = aChunk->ChannelFloatsForWrite(channel);
for (uint32_t i = 0; i < WEBAUDIO_BLOCK_SIZE; i++) {
samples[i] = 0.f;
}
}
}
void UpmixToStereoIfNeeded(const AudioBlock& aInput, AudioBlock* aOutput)
{
if (aInput.ChannelCount() == 2) {
const float* inputL = static_cast<const float*>(aInput.mChannelData[0]);
const float* inputR = static_cast<const float*>(aInput.mChannelData[1]);
float* outputL = aOutput->ChannelFloatsForWrite(0);
float* outputR = aOutput->ChannelFloatsForWrite(1);
AudioBlockCopyChannelWithScale(inputL, aInput.mVolume, outputL);
AudioBlockCopyChannelWithScale(inputR, aInput.mVolume, outputR);
} else {
MOZ_ASSERT(aInput.ChannelCount() == 1);
GainMonoToStereo(aInput, aOutput, aInput.mVolume, aInput.mVolume);
}
}
virtual void ProcessBlock(AudioNodeStream* aStream,
GraphTime aFrom,
const AudioBlock& aInput,
AudioBlock* aOutput,
bool *aFinished) override
{
// The output of this node is always stereo, no matter what the inputs are.
MOZ_ASSERT(aInput.ChannelCount() <= 2);
aOutput->AllocateChannels(2);
bool monoToStereo = aInput.ChannelCount() == 1;
if (aInput.IsNull()) {
// If input is silent, so is the output
SetToSilentStereoBlock(aOutput);
} else if (mPan.HasSimpleValue()) {
float panning = mPan.GetValue();
// If the panning is 0.0, we can simply copy the input to the
// output with gain applied, up-mixing to stereo if needed.
if (panning == 0.0f) {
UpmixToStereoIfNeeded(aInput, aOutput);
} else {
// Optimize the case where the panning is constant for this processing
// block: we can just apply a constant gain on the left and right
// channel
float gainL, gainR;
GetGainValuesForPanning(panning, monoToStereo, gainL, gainR);
ApplyStereoPanning(aInput, aOutput,
gainL * aInput.mVolume,
gainR * aInput.mVolume,
panning <= 0);
}
} else {
float computedGain[2*WEBAUDIO_BLOCK_SIZE + 4];
bool onLeft[WEBAUDIO_BLOCK_SIZE];
float values[WEBAUDIO_BLOCK_SIZE];
StreamTime tick = mDestination->GraphTimeToStreamTime(aFrom);
mPan.GetValuesAtTime(tick, values, WEBAUDIO_BLOCK_SIZE);
float* alignedComputedGain = ALIGNED16(computedGain);
ASSERT_ALIGNED16(alignedComputedGain);
for (size_t counter = 0; counter < WEBAUDIO_BLOCK_SIZE; ++counter) {
float left, right;
GetGainValuesForPanning(values[counter], monoToStereo, left, right);
alignedComputedGain[counter] = left * aInput.mVolume;
alignedComputedGain[WEBAUDIO_BLOCK_SIZE + counter] = right * aInput.mVolume;
onLeft[counter] = values[counter] <= 0;
}
// Apply the gain to the output buffer
ApplyStereoPanning(aInput, aOutput, alignedComputedGain, &alignedComputedGain[WEBAUDIO_BLOCK_SIZE], onLeft);
}
}
virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override
{
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
AudioNodeStream* mDestination;
AudioParamTimeline mPan;
};
StereoPannerNode::StereoPannerNode(AudioContext* aContext)
: AudioNode(aContext,
2,
ChannelCountMode::Clamped_max,
ChannelInterpretation::Speakers)
, mPan(new AudioParam(this, StereoPannerNodeEngine::PAN, 0.f, "pan"))
{
StereoPannerNodeEngine* engine = new StereoPannerNodeEngine(this, aContext->Destination());
mStream = AudioNodeStream::Create(aContext, engine,
AudioNodeStream::NO_STREAM_FLAGS,
aContext->Graph());
}
StereoPannerNode::~StereoPannerNode()
{
}
size_t
StereoPannerNode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
size_t amount = AudioNode::SizeOfExcludingThis(aMallocSizeOf);
amount += mPan->SizeOfIncludingThis(aMallocSizeOf);
return amount;
}
size_t
StereoPannerNode::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
JSObject*
StereoPannerNode::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return StereoPannerNodeBinding::Wrap(aCx, this, aGivenProto);
}
} // namespace dom
} // namespace mozilla
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