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https://github.com/mozilla/gecko-dev.git
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575 lines
16 KiB
C++
575 lines
16 KiB
C++
/* -*- 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 "OscillatorNode.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_CLASS(OscillatorNode)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(OscillatorNode)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mPeriodicWave)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mFrequency)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mDetune)
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if (tmp->Context()) {
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tmp->Context()->UnregisterOscillatorNode(tmp);
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}
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(AudioNode);
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(OscillatorNode, AudioNode)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPeriodicWave)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFrequency)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDetune)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(OscillatorNode)
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NS_INTERFACE_MAP_END_INHERITING(AudioNode)
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NS_IMPL_ADDREF_INHERITED(OscillatorNode, AudioNode)
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NS_IMPL_RELEASE_INHERITED(OscillatorNode, AudioNode)
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static const float sLeak = 0.995;
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class DCBlocker
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{
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public:
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// These are sane defauts when the initial mPhase is zero
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DCBlocker(float aLastInput = 0.0f,
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float aLastOutput = 0.0f,
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float aPole = 0.995)
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:mLastInput(aLastInput),
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mLastOutput(aLastOutput),
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mPole(aPole)
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{
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MOZ_ASSERT(aPole > 0);
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}
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inline float Process(float aInput)
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{
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float out;
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out = mLastOutput * mPole + aInput - mLastInput;
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mLastOutput = out;
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mLastInput = aInput;
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return out;
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}
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private:
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float mLastInput;
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float mLastOutput;
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float mPole;
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};
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class OscillatorNodeEngine : public AudioNodeEngine
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{
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public:
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OscillatorNodeEngine(AudioNode* aNode, AudioDestinationNode* aDestination)
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: AudioNodeEngine(aNode)
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, mSource(nullptr)
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, mDestination(static_cast<AudioNodeStream*> (aDestination->Stream()))
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, mStart(-1)
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, mStop(TRACK_TICKS_MAX)
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// Keep the default values in sync with OscillatorNode::OscillatorNode.
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, mFrequency(440.f)
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, mDetune(0.f)
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, mType(OscillatorType::Sine)
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, mPhase(0.)
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, mFinalFrequency(0.0)
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, mNumberOfHarmonics(0)
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, mSignalPeriod(0.0)
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, mAmplitudeAtZero(0.0)
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, mPhaseIncrement(0.0)
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, mSquare(0.0)
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, mTriangle(0.0)
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, mSaw(0.0)
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, mPhaseWrap(0.0)
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, mRecomputeFrequency(true)
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{
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}
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void SetSourceStream(AudioNodeStream* aSource)
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{
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mSource = aSource;
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}
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enum Parameters {
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FREQUENCY,
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DETUNE,
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TYPE,
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PERIODICWAVE,
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START,
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STOP,
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};
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void SetTimelineParameter(uint32_t aIndex,
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const AudioParamTimeline& aValue,
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TrackRate aSampleRate) MOZ_OVERRIDE
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{
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mRecomputeFrequency = true;
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switch (aIndex) {
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case FREQUENCY:
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MOZ_ASSERT(mSource && mDestination);
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mFrequency = aValue;
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WebAudioUtils::ConvertAudioParamToTicks(mFrequency, mSource, mDestination);
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break;
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case DETUNE:
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MOZ_ASSERT(mSource && mDestination);
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mDetune = aValue;
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WebAudioUtils::ConvertAudioParamToTicks(mDetune, mSource, mDestination);
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break;
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default:
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NS_ERROR("Bad OscillatorNodeEngine TimelineParameter");
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}
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}
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virtual void SetStreamTimeParameter(uint32_t aIndex, TrackTicks aParam)
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{
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switch (aIndex) {
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case START: mStart = aParam; break;
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case STOP: mStop = aParam; break;
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default:
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NS_ERROR("Bad OscillatorNodeEngine StreamTimeParameter");
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}
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}
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virtual void SetInt32Parameter(uint32_t aIndex, int32_t aParam)
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{
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mType = static_cast<OscillatorType>(aParam);
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// Set the new type, and update integrators with the new initial conditions.
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switch (mType) {
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case OscillatorType::Sine:
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mPhase = 0.0;
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break;
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case OscillatorType::Square:
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mPhase = 0.0;
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// Initial integration condition is -0.5, because our square has 50%
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// duty cycle.
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mSquare = -0.5;
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break;
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case OscillatorType::Triangle:
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// Initial mPhase and related integration condition so the triangle is
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// in the middle of the first upward slope.
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// XXX actually do the maths and put the right number here.
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mPhase = M_PI / 2;
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mSquare = 0.5;
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mTriangle = 0.0;
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break;
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case OscillatorType::Sawtooth:
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/* initial mPhase so the oscillator start at the middle
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* of the ramp, per spec */
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mPhase = M_PI / 2;
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/* mSaw = 0 when mPhase = pi/2 */
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mSaw = 0.0;
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break;
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default:
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NS_ERROR("Bad OscillatorNodeEngine Int32Parameter.");
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};
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}
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void IncrementPhase()
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{
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mPhase += mPhaseIncrement;
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if (mPhase > mPhaseWrap) {
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mPhase -= mPhaseWrap;
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}
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}
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// Square and triangle are using a bipolar band-limited impulse train, saw is
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// using a normal band-limited impulse train.
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bool UsesBipolarBLIT() {
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return mType == OscillatorType::Square || mType == OscillatorType::Triangle;
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}
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void UpdateFrequencyIfNeeded(TrackTicks ticks, size_t count)
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{
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double frequency, detune;
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bool simpleFrequency = mFrequency.HasSimpleValue();
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bool simpleDetune = mDetune.HasSimpleValue();
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// Shortcut if frequency-related AudioParam are not automated, and we
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// already have computed the frequency information and related parameters.
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if (simpleFrequency && simpleDetune && !mRecomputeFrequency) {
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return;
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}
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if (simpleFrequency) {
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frequency = mFrequency.GetValue();
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} else {
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frequency = mFrequency.GetValueAtTime(ticks, count);
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}
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if (simpleDetune) {
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detune = mDetune.GetValue();
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} else {
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detune = mDetune.GetValueAtTime(ticks, count);
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}
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mFinalFrequency = frequency * pow(2., detune / 1200.);
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mRecomputeFrequency = false;
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// When using bipolar BLIT, we divide the signal period by two, because we
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// are using two BLIT out of phase.
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mSignalPeriod = UsesBipolarBLIT() ? 0.5 * mSource->SampleRate() / mFinalFrequency
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: mSource->SampleRate() / mFinalFrequency;
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// Wrap the phase accordingly:
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mPhaseWrap = UsesBipolarBLIT() || mType == OscillatorType::Sine ? 2 * M_PI
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: M_PI;
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// Even number of harmonics for bipolar blit, odd otherwise.
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mNumberOfHarmonics = UsesBipolarBLIT() ? 2 * floor(0.5 * mSignalPeriod)
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: 2 * floor(0.5 * mSignalPeriod) + 1;
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mPhaseIncrement = mType == OscillatorType::Sine ? 2 * M_PI / mSignalPeriod
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: M_PI / mSignalPeriod;
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mAmplitudeAtZero = mNumberOfHarmonics / mSignalPeriod;
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}
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void FillBounds(float* output, TrackTicks ticks,
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uint32_t& start, uint32_t& end)
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{
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MOZ_ASSERT(output);
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static_assert(TrackTicks(WEBAUDIO_BLOCK_SIZE) < UINT_MAX,
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"WEBAUDIO_BLOCK_SIZE overflows interator bounds.");
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start = 0;
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if (ticks < mStart) {
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start = mStart - ticks;
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for (uint32_t i = 0; i < start; ++i) {
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output[i] = 0.0;
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}
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}
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end = WEBAUDIO_BLOCK_SIZE;
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if (ticks + end > mStop) {
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end = mStop - ticks;
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for (uint32_t i = end; i < WEBAUDIO_BLOCK_SIZE; ++i) {
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output[i] = 0.0;
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}
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}
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}
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float BipolarBLIT()
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{
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float blit;
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float denom = sin(mPhase);
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if (fabs(denom) < std::numeric_limits<float>::epsilon()) {
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if (mPhase < 0.1f || mPhase > 2 * M_PI - 0.1f) {
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blit = mAmplitudeAtZero;
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} else {
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blit = -mAmplitudeAtZero;
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}
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} else {
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blit = sin(mNumberOfHarmonics * mPhase);
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blit /= mSignalPeriod * denom;
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}
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return blit;
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}
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float UnipolarBLIT()
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{
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float blit;
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float denom = sin(mPhase);
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if (fabs(denom) <= std::numeric_limits<float>::epsilon()) {
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blit = mAmplitudeAtZero;
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} else {
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blit = sin(mNumberOfHarmonics * mPhase);
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blit /= mSignalPeriod * denom;
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}
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return blit;
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}
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void ComputeSine(float * aOutput, TrackTicks ticks, uint32_t aStart, uint32_t aEnd)
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{
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for (uint32_t i = aStart; i < aEnd; ++i) {
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UpdateFrequencyIfNeeded(ticks, i);
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aOutput[i] = sin(mPhase);
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IncrementPhase();
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}
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}
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void ComputeSquare(float * aOutput, TrackTicks ticks, uint32_t aStart, uint32_t aEnd)
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{
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for (uint32_t i = aStart; i < aEnd; ++i) {
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UpdateFrequencyIfNeeded(ticks, i);
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// Integration to get us a square. It turns out we can have a
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// pure integrator here.
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mSquare += BipolarBLIT();
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aOutput[i] = mSquare;
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// maybe we want to apply a gain, the wg has not decided yet
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aOutput[i] *= 1.5;
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IncrementPhase();
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}
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}
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void ComputeSawtooth(float * aOutput, TrackTicks ticks, uint32_t aStart, uint32_t aEnd)
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{
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float dcoffset;
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for (uint32_t i = aStart; i < aEnd; ++i) {
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UpdateFrequencyIfNeeded(ticks, i);
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// DC offset so the Saw does not ramp up to infinity when integrating.
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dcoffset = mFinalFrequency / mSource->SampleRate();
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// Integrate and offset so we get mAmplitudeAtZero sawtooth. We have a
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// very low frequency component somewhere here, but I'm not sure where.
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mSaw += UnipolarBLIT() - dcoffset;
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// reverse the saw so we are spec compliant
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aOutput[i] = -mSaw * 1.5;
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IncrementPhase();
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}
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}
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void ComputeTriangle(float * aOutput, TrackTicks ticks, uint32_t aStart, uint32_t aEnd)
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{
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for (uint32_t i = aStart; i < aEnd; ++i) {
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UpdateFrequencyIfNeeded(ticks, i);
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// Integrate to get a square
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mSquare += BipolarBLIT();
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// Leaky integrate to get a triangle. We get too much dc offset if we don't
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// leaky integrate here.
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// C6 = k0 / period
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// (period is samplingrate / frequency, k0 = (PI/2)/(2*PI)) = 0.25
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float C6 = 0.25 / (mSource->SampleRate() / mFinalFrequency);
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mTriangle = mTriangle * sLeak + mSquare + C6;
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// DC Block, and scale back to [-1.0; 1.0]
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aOutput[i] = mDCBlocker.Process(mTriangle) / (mSignalPeriod/2) * 1.5;
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IncrementPhase();
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}
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}
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void ComputeSilence(AudioChunk *aOutput)
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{
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aOutput->SetNull(WEBAUDIO_BLOCK_SIZE);
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}
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virtual void ProduceAudioBlock(AudioNodeStream* aStream,
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const AudioChunk& aInput,
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AudioChunk* aOutput,
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bool* aFinished) MOZ_OVERRIDE
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{
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MOZ_ASSERT(mSource == aStream, "Invalid source stream");
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TrackTicks ticks = aStream->GetCurrentPosition();
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if (mStart == -1) {
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ComputeSilence(aOutput);
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return;
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}
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if (ticks + WEBAUDIO_BLOCK_SIZE < mStart) {
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// We're not playing yet.
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ComputeSilence(aOutput);
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return;
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}
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if (ticks >= mStop) {
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// We've finished playing.
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ComputeSilence(aOutput);
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*aFinished = true;
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return;
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}
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AllocateAudioBlock(1, aOutput);
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float* output = static_cast<float*>(
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const_cast<void*>(aOutput->mChannelData[0]));
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uint32_t start, end;
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FillBounds(output, ticks, start, end);
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// Synthesize the correct waveform.
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switch(mType) {
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case OscillatorType::Sine:
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ComputeSine(output, ticks, start, end);
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break;
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case OscillatorType::Square:
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ComputeSquare(output, ticks, start, end);
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break;
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case OscillatorType::Triangle:
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ComputeTriangle(output, ticks, start, end);
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break;
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case OscillatorType::Sawtooth:
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ComputeSawtooth(output, ticks, start, end);
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break;
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default:
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ComputeSilence(aOutput);
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};
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}
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DCBlocker mDCBlocker;
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AudioNodeStream* mSource;
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AudioNodeStream* mDestination;
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TrackTicks mStart;
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TrackTicks mStop;
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AudioParamTimeline mFrequency;
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AudioParamTimeline mDetune;
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OscillatorType mType;
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float mPhase;
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float mFinalFrequency;
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uint32_t mNumberOfHarmonics;
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float mSignalPeriod;
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float mAmplitudeAtZero;
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float mPhaseIncrement;
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float mSquare;
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float mTriangle;
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float mSaw;
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float mPhaseWrap;
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bool mRecomputeFrequency;
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};
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OscillatorNode::OscillatorNode(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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, mType(OscillatorType::Sine)
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, mFrequency(new AudioParam(MOZ_THIS_IN_INITIALIZER_LIST(),
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SendFrequencyToStream, 440.0f))
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, mDetune(new AudioParam(MOZ_THIS_IN_INITIALIZER_LIST(),
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SendDetuneToStream, 0.0f))
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, mStartCalled(false)
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, mStopped(false)
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{
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OscillatorNodeEngine* engine = new OscillatorNodeEngine(this, aContext->Destination());
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mStream = aContext->Graph()->CreateAudioNodeStream(engine, MediaStreamGraph::SOURCE_STREAM);
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engine->SetSourceStream(static_cast<AudioNodeStream*> (mStream.get()));
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}
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OscillatorNode::~OscillatorNode()
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{
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if (Context()) {
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Context()->UnregisterOscillatorNode(this);
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}
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}
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JSObject*
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OscillatorNode::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aScope)
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{
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return OscillatorNodeBinding::Wrap(aCx, aScope, this);
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}
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void
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OscillatorNode::SendFrequencyToStream(AudioNode* aNode)
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{
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OscillatorNode* This = static_cast<OscillatorNode*>(aNode);
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SendTimelineParameterToStream(This, OscillatorNodeEngine::FREQUENCY, *This->mFrequency);
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}
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void
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OscillatorNode::SendDetuneToStream(AudioNode* aNode)
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{
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OscillatorNode* This = static_cast<OscillatorNode*>(aNode);
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SendTimelineParameterToStream(This, OscillatorNodeEngine::DETUNE, *This->mDetune);
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}
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void
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OscillatorNode::SendTypeToStream()
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{
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SendInt32ParameterToStream(OscillatorNodeEngine::TYPE, static_cast<int32_t>(mType));
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if (mType == OscillatorType::Custom) {
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// TODO: Send the custom wave table somehow
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}
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}
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void
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OscillatorNode::Start(double aWhen, ErrorResult& aRv)
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{
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if (!WebAudioUtils::IsTimeValid(aWhen)) {
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aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
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return;
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}
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if (mStartCalled) {
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aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
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return;
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}
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mStartCalled = true;
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AudioNodeStream* ns = static_cast<AudioNodeStream*>(mStream.get());
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if (!ns) {
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// Nothing to play, or we're already dead for some reason
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return;
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}
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// TODO: Perhaps we need to do more here.
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ns->SetStreamTimeParameter(OscillatorNodeEngine::START,
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Context()->DestinationStream(),
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aWhen);
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MOZ_ASSERT(!mPlayingRef, "We can only accept a successful start() call once");
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mPlayingRef.Take(this);
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}
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void
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OscillatorNode::Stop(double aWhen, ErrorResult& aRv)
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{
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if (!WebAudioUtils::IsTimeValid(aWhen)) {
|
|
aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
|
|
return;
|
|
}
|
|
|
|
if (!mStartCalled) {
|
|
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
|
|
return;
|
|
}
|
|
|
|
mPlayingRef.Drop(this);
|
|
|
|
AudioNodeStream* ns = static_cast<AudioNodeStream*>(mStream.get());
|
|
if (!ns || !Context()) {
|
|
// We've already stopped and had our stream shut down
|
|
return;
|
|
}
|
|
|
|
// TODO: Perhaps we need to do more here.
|
|
ns->SetStreamTimeParameter(OscillatorNodeEngine::STOP,
|
|
Context()->DestinationStream(),
|
|
std::max(0.0, aWhen));
|
|
}
|
|
|
|
void
|
|
OscillatorNode::NotifyMainThreadStateChanged()
|
|
{
|
|
if (mStream->IsFinished()) {
|
|
class EndedEventDispatcher : public nsRunnable
|
|
{
|
|
public:
|
|
explicit EndedEventDispatcher(OscillatorNode* aNode)
|
|
: mNode(aNode) {}
|
|
NS_IMETHODIMP Run()
|
|
{
|
|
// If it's not safe to run scripts right now, schedule this to run later
|
|
if (!nsContentUtils::IsSafeToRunScript()) {
|
|
nsContentUtils::AddScriptRunner(this);
|
|
return NS_OK;
|
|
}
|
|
|
|
mNode->DispatchTrustedEvent(NS_LITERAL_STRING("ended"));
|
|
return NS_OK;
|
|
}
|
|
private:
|
|
nsRefPtr<OscillatorNode> mNode;
|
|
};
|
|
if (!mStopped) {
|
|
// Only dispatch the ended event once
|
|
NS_DispatchToMainThread(new EndedEventDispatcher(this));
|
|
mStopped = true;
|
|
}
|
|
|
|
// Drop the playing reference
|
|
// Warning: The below line might delete this.
|
|
mPlayingRef.Drop(this);
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
|