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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 "IIRFilterNode.h"
#include "AudioNodeEngine.h"
#include "blink/IIRFilter.h"
#include "nsGkAtoms.h"
namespace mozilla {
namespace dom {
NS_IMPL_ISUPPORTS_INHERITED0(IIRFilterNode, AudioNode)
class IIRFilterNodeEngine final : public AudioNodeEngine
{
public:
IIRFilterNodeEngine(AudioNode* aNode, AudioDestinationNode* aDestination,
const AudioDoubleArray &aFeedforward,
const AudioDoubleArray &aFeedback,
uint64_t aWindowID)
: AudioNodeEngine(aNode)
, mDestination(aDestination->Stream())
, mFeedforward(aFeedforward)
, mFeedback(aFeedback)
, mWindowID(aWindowID)
{
}
void ProcessBlock(AudioNodeStream* aStream,
GraphTime aFrom,
const AudioBlock& aInput,
AudioBlock* aOutput,
bool* aFinished) override
{
float inputBuffer[WEBAUDIO_BLOCK_SIZE + 4];
float* alignedInputBuffer = ALIGNED16(inputBuffer);
ASSERT_ALIGNED16(alignedInputBuffer);
if (aInput.IsNull()) {
if (!mIIRFilters.IsEmpty()) {
bool allZero = true;
for (uint32_t i = 0; i < mIIRFilters.Length(); ++i) {
allZero &= mIIRFilters[i]->buffersAreZero();
}
// all filter buffer values are zero, so the output will be zero
// as well.
if (allZero) {
mIIRFilters.Clear();
aStream->ScheduleCheckForInactive();
RefPtr<PlayingRefChangeHandler> refchanged =
new PlayingRefChangeHandler(aStream, PlayingRefChangeHandler::RELEASE);
aStream->Graph()->
DispatchToMainThreadAfterStreamStateUpdate(refchanged.forget());
aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
return;
}
PodZero(alignedInputBuffer, WEBAUDIO_BLOCK_SIZE);
}
} else if(mIIRFilters.Length() != aInput.ChannelCount()){
if (mIIRFilters.IsEmpty()) {
RefPtr<PlayingRefChangeHandler> refchanged =
new PlayingRefChangeHandler(aStream, PlayingRefChangeHandler::ADDREF);
aStream->Graph()->
DispatchToMainThreadAfterStreamStateUpdate(refchanged.forget());
} else {
WebAudioUtils::LogToDeveloperConsole(mWindowID,
"IIRFilterChannelCountChangeWarning");
}
// Adjust the number of filters based on the number of channels
mIIRFilters.SetLength(aInput.ChannelCount());
for (size_t i = 0; i < aInput.ChannelCount(); ++i) {
mIIRFilters[i] = new blink::IIRFilter(&mFeedforward, &mFeedback);
}
}
uint32_t numberOfChannels = mIIRFilters.Length();
aOutput->AllocateChannels(numberOfChannels);
for (uint32_t i = 0; i < numberOfChannels; ++i) {
const float* input;
if (aInput.IsNull()) {
input = alignedInputBuffer;
} else {
input = static_cast<const float*>(aInput.mChannelData[i]);
if (aInput.mVolume != 1.0) {
AudioBlockCopyChannelWithScale(input, aInput.mVolume, alignedInputBuffer);
input = alignedInputBuffer;
}
}
mIIRFilters[i]->process(input,
aOutput->ChannelFloatsForWrite(i),
aInput.GetDuration());
}
}
bool IsActive() const override
{
return !mIIRFilters.IsEmpty();
}
size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override
{
// Not owned:
// - mDestination - probably not owned
// - AudioParamTimelines - counted in the AudioNode
size_t amount = AudioNodeEngine::SizeOfExcludingThis(aMallocSizeOf);
amount += mIIRFilters.ShallowSizeOfExcludingThis(aMallocSizeOf);
return amount;
}
size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override
{
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
private:
AudioNodeStream* mDestination;
nsTArray<nsAutoPtr<blink::IIRFilter>> mIIRFilters;
AudioDoubleArray mFeedforward;
AudioDoubleArray mFeedback;
uint64_t mWindowID;
};
IIRFilterNode::IIRFilterNode(AudioContext* aContext,
const mozilla::dom::binding_detail::AutoSequence<double>& aFeedforward,
const mozilla::dom::binding_detail::AutoSequence<double>& aFeedback)
: AudioNode(aContext,
2,
ChannelCountMode::Max,
ChannelInterpretation::Speakers)
{
mFeedforward.SetLength(aFeedforward.Length());
PodCopy(mFeedforward.Elements(), aFeedforward.Elements(), aFeedforward.Length());
mFeedback.SetLength(aFeedback.Length());
PodCopy(mFeedback.Elements(), aFeedback.Elements(), aFeedback.Length());
// Scale coefficients -- we guarantee that mFeedback != 0 when creating
// the IIRFilterNode.
double scale = mFeedback[0];
double* elements = mFeedforward.Elements();
for (size_t i = 0; i < mFeedforward.Length(); ++i) {
elements[i] /= scale;
}
elements = mFeedback.Elements();
for (size_t i = 0; i < mFeedback.Length(); ++i) {
elements[i] /= scale;
}
// We check that this is exactly equal to one later in blink/IIRFilter.cpp
elements[0] = 1.0;
uint64_t windowID = aContext->GetParentObject()->WindowID();
IIRFilterNodeEngine* engine = new IIRFilterNodeEngine(this, aContext->Destination(), mFeedforward, mFeedback, windowID);
mStream = AudioNodeStream::Create(aContext, engine,
AudioNodeStream::NO_STREAM_FLAGS,
aContext->Graph());
}
IIRFilterNode::~IIRFilterNode()
{
}
size_t
IIRFilterNode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
size_t amount = AudioNode::SizeOfExcludingThis(aMallocSizeOf);
return amount;
}
size_t
IIRFilterNode::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
JSObject*
IIRFilterNode::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return IIRFilterNodeBinding::Wrap(aCx, this, aGivenProto);
}
void
IIRFilterNode::GetFrequencyResponse(const Float32Array& aFrequencyHz,
const Float32Array& aMagResponse,
const Float32Array& aPhaseResponse)
{
aFrequencyHz.ComputeLengthAndData();
aMagResponse.ComputeLengthAndData();
aPhaseResponse.ComputeLengthAndData();
uint32_t length = std::min(std::min(aFrequencyHz.Length(),
aMagResponse.Length()),
aPhaseResponse.Length());
if (!length) {
return;
}
auto frequencies = MakeUnique<float[]>(length);
float* frequencyHz = aFrequencyHz.Data();
const double nyquist = Context()->SampleRate() * 0.5;
// Normalize the frequencies
for (uint32_t i = 0; i < length; ++i) {
if (frequencyHz[i] >= 0 && frequencyHz[i] <= nyquist) {
frequencies[i] = static_cast<float>(frequencyHz[i] / nyquist);
} else {
frequencies[i] = std::numeric_limits<float>::quiet_NaN();
}
}
blink::IIRFilter filter(&mFeedforward, &mFeedback);
filter.getFrequencyResponse(int(length), frequencies.get(), aMagResponse.Data(), aPhaseResponse.Data());
}
} // namespace dom
} // namespace mozilla
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