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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 "DelayNode.h"
#include "mozilla/dom/DelayNodeBinding.h"
#include "AudioNodeEngine.h"
#include "AudioNodeStream.h"
#include "AudioDestinationNode.h"
#include "WebAudioUtils.h"
#include "DelayBuffer.h"
#include "PlayingRefChangeHandler.h"
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_INHERITED(DelayNode, AudioNode,
mDelay)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(DelayNode)
NS_INTERFACE_MAP_END_INHERITING(AudioNode)
NS_IMPL_ADDREF_INHERITED(DelayNode, AudioNode)
NS_IMPL_RELEASE_INHERITED(DelayNode, AudioNode)
class DelayNodeEngine final : public AudioNodeEngine
{
typedef PlayingRefChangeHandler PlayingRefChanged;
public:
DelayNodeEngine(AudioNode* aNode, AudioDestinationNode* aDestination,
double aMaxDelayTicks)
: AudioNodeEngine(aNode)
, mDestination(aDestination->Stream())
// Keep the default value in sync with the default value in DelayNode::DelayNode.
, mDelay(0.f)
// Use a smoothing range of 20ms
, mBuffer(std::max(aMaxDelayTicks,
static_cast<double>(WEBAUDIO_BLOCK_SIZE)),
WebAudioUtils::ComputeSmoothingRate(0.02,
mDestination->SampleRate()))
, mMaxDelay(aMaxDelayTicks)
, mHaveProducedBeforeInput(false)
, mLeftOverData(INT32_MIN)
{
}
DelayNodeEngine* AsDelayNodeEngine() override
{
return this;
}
enum Parameters {
DELAY,
};
void RecvTimelineEvent(uint32_t aIndex,
AudioTimelineEvent& aEvent) override
{
MOZ_ASSERT(mDestination);
WebAudioUtils::ConvertAudioTimelineEventToTicks(aEvent,
mDestination);
switch (aIndex) {
case DELAY:
mDelay.InsertEvent<int64_t>(aEvent);
break;
default:
NS_ERROR("Bad DelayNodeEngine TimelineParameter");
}
}
void ProcessBlock(AudioNodeStream* aStream,
GraphTime aFrom,
const AudioBlock& aInput,
AudioBlock* aOutput,
bool* aFinished) override
{
MOZ_ASSERT(aStream->SampleRate() == mDestination->SampleRate());
if (!aInput.IsSilentOrSubnormal()) {
if (mLeftOverData <= 0) {
RefPtr<PlayingRefChanged> refchanged =
new PlayingRefChanged(aStream, PlayingRefChanged::ADDREF);
aStream->Graph()->
DispatchToMainThreadAfterStreamStateUpdate(refchanged.forget());
}
mLeftOverData = mBuffer.MaxDelayTicks();
} else if (mLeftOverData > 0) {
mLeftOverData -= WEBAUDIO_BLOCK_SIZE;
} else {
if (mLeftOverData != INT32_MIN) {
mLeftOverData = INT32_MIN;
aStream->ScheduleCheckForInactive();
// Delete our buffered data now we no longer need it
mBuffer.Reset();
RefPtr<PlayingRefChanged> refchanged =
new PlayingRefChanged(aStream, PlayingRefChanged::RELEASE);
aStream->Graph()->
DispatchToMainThreadAfterStreamStateUpdate(refchanged.forget());
}
aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
return;
}
mBuffer.Write(aInput);
// Skip output update if mLastChunks has already been set by
// ProduceBlockBeforeInput() when in a cycle.
if (!mHaveProducedBeforeInput) {
UpdateOutputBlock(aStream, aFrom, aOutput, 0.0);
}
mHaveProducedBeforeInput = false;
mBuffer.NextBlock();
}
void UpdateOutputBlock(AudioNodeStream* aStream, GraphTime aFrom,
AudioBlock* aOutput, double minDelay)
{
double maxDelay = mMaxDelay;
double sampleRate = aStream->SampleRate();
ChannelInterpretation channelInterpretation =
aStream->GetChannelInterpretation();
if (mDelay.HasSimpleValue()) {
// If this DelayNode is in a cycle, make sure the delay value is at least
// one block, even if that is greater than maxDelay.
double delayFrames = mDelay.GetValue() * sampleRate;
double delayFramesClamped =
std::max(minDelay, std::min(delayFrames, maxDelay));
mBuffer.Read(delayFramesClamped, aOutput, channelInterpretation);
} else {
// Compute the delay values for the duration of the input AudioChunk
// If this DelayNode is in a cycle, make sure the delay value is at least
// one block.
StreamTime tick = mDestination->GraphTimeToStreamTime(aFrom);
float values[WEBAUDIO_BLOCK_SIZE];
mDelay.GetValuesAtTime(tick, values,WEBAUDIO_BLOCK_SIZE);
double computedDelay[WEBAUDIO_BLOCK_SIZE];
for (size_t counter = 0; counter < WEBAUDIO_BLOCK_SIZE; ++counter) {
double delayAtTick = values[counter] * sampleRate;
double delayAtTickClamped =
std::max(minDelay, std::min(delayAtTick, maxDelay));
computedDelay[counter] = delayAtTickClamped;
}
mBuffer.Read(computedDelay, aOutput, channelInterpretation);
}
}
void ProduceBlockBeforeInput(AudioNodeStream* aStream,
GraphTime aFrom,
AudioBlock* aOutput) override
{
if (mLeftOverData <= 0) {
aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
} else {
UpdateOutputBlock(aStream, aFrom, aOutput, WEBAUDIO_BLOCK_SIZE);
}
mHaveProducedBeforeInput = true;
}
bool IsActive() const override
{
return mLeftOverData != INT32_MIN;
}
size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override
{
size_t amount = AudioNodeEngine::SizeOfExcludingThis(aMallocSizeOf);
// Not owned:
// - mDestination - probably not owned
// - mDelay - shares ref with AudioNode, don't count
amount += mBuffer.SizeOfExcludingThis(aMallocSizeOf);
return amount;
}
size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override
{
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
AudioNodeStream* mDestination;
AudioParamTimeline mDelay;
DelayBuffer mBuffer;
double mMaxDelay;
bool mHaveProducedBeforeInput;
// How much data we have in our buffer which needs to be flushed out when our inputs
// finish.
int32_t mLeftOverData;
};
DelayNode::DelayNode(AudioContext* aContext, double aMaxDelay)
: AudioNode(aContext,
2,
ChannelCountMode::Max,
ChannelInterpretation::Speakers)
, mDelay(new AudioParam(this, DelayNodeEngine::DELAY, 0.0f, "delayTime"))
{
DelayNodeEngine* engine =
new DelayNodeEngine(this, aContext->Destination(),
aContext->SampleRate() * aMaxDelay);
mStream = AudioNodeStream::Create(aContext, engine,
AudioNodeStream::NO_STREAM_FLAGS,
aContext->Graph());
}
DelayNode::~DelayNode()
{
}
size_t
DelayNode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
size_t amount = AudioNode::SizeOfExcludingThis(aMallocSizeOf);
amount += mDelay->SizeOfIncludingThis(aMallocSizeOf);
return amount;
}
size_t
DelayNode::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
JSObject*
DelayNode::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return DelayNodeBinding::Wrap(aCx, this, aGivenProto);
}
} // namespace dom
} // namespace mozilla
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