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https://github.com/eliasstepanik/strudel-docker.git
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Add pink, white and brown oscillators
This commit is contained in:
Raphael Forment
parent
8a741952df
commit
c2481e460b
@ -20,100 +20,102 @@ const fm = (osc, harmonicityRatio, modulationIndex, wave = 'sine') => {
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return mod(modfreq, modgain, wave);
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};
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export function registerSynthSounds() {
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['sine', 'square', 'triangle', 'sawtooth'].forEach((wave) => {
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registerSound(
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wave,
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(t, value, onended) => {
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// destructure adsr here, because the default should be different for synths and samples
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let {
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attack = 0.001,
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decay = 0.05,
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sustain = 0.6,
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release = 0.01,
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fmh: fmHarmonicity = 1,
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fmi: fmModulationIndex,
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fmenv: fmEnvelopeType = 'lin',
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fmattack: fmAttack,
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fmdecay: fmDecay,
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fmsustain: fmSustain,
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fmrelease: fmRelease,
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fmvelocity: fmVelocity,
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fmwave: fmWaveform = 'sine',
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vib = 0,
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vibmod = 0.5,
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} = value;
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let { n, note, freq } = value;
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// with synths, n and note are the same thing
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note = note || 36;
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if (typeof note === 'string') {
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note = noteToMidi(note); // e.g. c3 => 48
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}
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// get frequency
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if (!freq && typeof note === 'number') {
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freq = midiToFreq(note); // + 48);
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}
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// maybe pull out the above frequency resolution?? (there is also getFrequency but it has no default)
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// make oscillator
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const { node: o, stop } = getOscillator({
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t,
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s: wave,
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freq,
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vib,
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vibmod,
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partials: n,
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});
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// FM + FM envelope
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let stopFm, fmEnvelope;
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if (fmModulationIndex) {
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const { node: modulator, stop } = fm(o, fmHarmonicity, fmModulationIndex, fmWaveform);
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if (![fmAttack, fmDecay, fmSustain, fmRelease, fmVelocity].find((v) => v !== undefined)) {
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// no envelope by default
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modulator.connect(o.frequency);
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} else {
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fmAttack = fmAttack ?? 0.001;
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fmDecay = fmDecay ?? 0.001;
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fmSustain = fmSustain ?? 1;
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fmRelease = fmRelease ?? 0.001;
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fmVelocity = fmVelocity ?? 1;
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fmEnvelope = getEnvelope(fmAttack, fmDecay, fmSustain, fmRelease, fmVelocity, t);
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if (fmEnvelopeType === 'exp') {
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fmEnvelope = getExpEnvelope(fmAttack, fmDecay, fmSustain, fmRelease, fmVelocity, t);
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fmEnvelope.node.maxValue = fmModulationIndex * 2;
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fmEnvelope.node.minValue = 0.00001;
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}
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modulator.connect(fmEnvelope.node);
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fmEnvelope.node.connect(o.frequency);
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['sine', 'square', 'triangle',
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'sawtooth', 'pink', 'white',
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'brown'].forEach((wave) => {
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registerSound(
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wave,
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(t, value, onended) => {
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// destructure adsr here, because the default should be different for synths and samples
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let {
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attack = 0.001,
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decay = 0.05,
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sustain = 0.6,
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release = 0.01,
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fmh: fmHarmonicity = 1,
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fmi: fmModulationIndex,
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fmenv: fmEnvelopeType = 'lin',
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fmattack: fmAttack,
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fmdecay: fmDecay,
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fmsustain: fmSustain,
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fmrelease: fmRelease,
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fmvelocity: fmVelocity,
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fmwave: fmWaveform = 'sine',
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vib = 0,
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vibmod = 0.5,
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} = value;
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let { n, note, freq } = value;
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// with synths, n and note are the same thing
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note = note || 36;
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if (typeof note === 'string') {
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note = noteToMidi(note); // e.g. c3 => 48
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}
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// get frequency
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if (!freq && typeof note === 'number') {
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freq = midiToFreq(note); // + 48);
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}
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// maybe pull out the above frequency resolution?? (there is also getFrequency but it has no default)
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// make oscillator
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const { node: o, stop } = getOscillator({
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t,
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s: wave,
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freq,
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vib,
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vibmod,
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partials: n,
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});
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// FM + FM envelope
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let stopFm, fmEnvelope;
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if (fmModulationIndex) {
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const { node: modulator, stop } = fm(o, fmHarmonicity, fmModulationIndex, fmWaveform);
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if (![fmAttack, fmDecay, fmSustain, fmRelease, fmVelocity].find((v) => v !== undefined)) {
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// no envelope by default
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modulator.connect(o.frequency);
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} else {
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fmAttack = fmAttack ?? 0.001;
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fmDecay = fmDecay ?? 0.001;
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fmSustain = fmSustain ?? 1;
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fmRelease = fmRelease ?? 0.001;
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fmVelocity = fmVelocity ?? 1;
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fmEnvelope = getEnvelope(fmAttack, fmDecay, fmSustain, fmRelease, fmVelocity, t);
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if (fmEnvelopeType === 'exp') {
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fmEnvelope = getExpEnvelope(fmAttack, fmDecay, fmSustain, fmRelease, fmVelocity, t);
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fmEnvelope.node.maxValue = fmModulationIndex * 2;
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fmEnvelope.node.minValue = 0.00001;
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}
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modulator.connect(fmEnvelope.node);
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fmEnvelope.node.connect(o.frequency);
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}
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stopFm = stop;
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}
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stopFm = stop;
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}
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// turn down
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const g = gainNode(0.3);
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// turn down
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const g = gainNode(0.3);
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// gain envelope
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const { node: envelope, stop: releaseEnvelope } = getEnvelope(attack, decay, sustain, release, 1, t);
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// gain envelope
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const { node: envelope, stop: releaseEnvelope } = getEnvelope(attack, decay, sustain, release, 1, t);
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o.onended = () => {
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o.disconnect();
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g.disconnect();
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onended();
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};
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return {
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node: o.connect(g).connect(envelope),
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stop: (releaseTime) => {
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releaseEnvelope(releaseTime);
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fmEnvelope?.stop(releaseTime);
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let end = releaseTime + release;
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stop(end);
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stopFm?.(end);
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},
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};
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},
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{ type: 'synth', prebake: true },
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);
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});
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o.onended = () => {
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o.disconnect();
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g.disconnect();
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onended();
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};
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return {
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node: o.connect(g).connect(envelope),
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stop: (releaseTime) => {
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releaseEnvelope(releaseTime);
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fmEnvelope?.stop(releaseTime);
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let end = releaseTime + release;
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stop(end);
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stopFm?.(end);
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},
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};
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},
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{ type: 'synth', prebake: true },
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);
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});
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}
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export function waveformN(partials, type) {
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@ -146,36 +148,86 @@ export function waveformN(partials, type) {
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return osc;
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}
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export function getOscillator({ s, freq, t, vib, vibmod, partials }) {
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// Make oscillator with partial count
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let o;
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if (!partials || s === 'sine') {
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o = getAudioContext().createOscillator();
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o.type = s || 'triangle';
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} else {
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o = waveformN(partials, s);
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}
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o.frequency.value = Number(freq);
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o.start(t);
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export function getNoiseOscillator({ t, ac, type = 'white' }) {
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const bufferSize = 2 * ac.sampleRate;
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const noiseBuffer = ac.createBuffer(1, bufferSize, ac.sampleRate);
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const output = noiseBuffer.getChannelData(0);
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let lastOut = 0;
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let b0, b1, b2, b3, b4, b5, b6;
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b0 = b1 = b2 = b3 = b4 = b5 = b6 = 0.0;
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// Additional oscillator for vibrato effect
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let vibrato_oscillator;
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if (vib > 0) {
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vibrato_oscillator = getAudioContext().createOscillator();
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vibrato_oscillator.frequency.value = vib;
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const gain = getAudioContext().createGain();
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// Vibmod is the amount of vibrato, in semitones
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gain.gain.value = vibmod * 100;
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vibrato_oscillator.connect(gain);
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gain.connect(o.detune);
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vibrato_oscillator.start(t);
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for (let i = 0; i < bufferSize; i++) {
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if (type === 'white') {
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output[i] = Math.random() * 2 - 1;
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} else if (type === 'brown') {
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let white = Math.random() * 2 - 1;
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output[i] = (lastOut + (0.02 * white)) / 1.02;
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lastOut = output[i];
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} else if (type === 'pink') {
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let white = Math.random() * 2 - 1;
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b0 = 0.99886 * b0 + white * 0.0555179;
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b1 = 0.99332 * b1 + white * 0.0750759;
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b2 = 0.96900 * b2 + white * 0.1538520;
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b3 = 0.86650 * b3 + white * 0.3104856;
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b4 = 0.55000 * b4 + white * 0.5329522;
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b5 = -0.7616 * b5 - white * 0.0168980;
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output[i] = b0 + b1 + b2 + b3 + b4 + b5 + b6 + white * 0.5362;
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output[i] *= 0.11;
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b6 = white * 0.115926;
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}
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}
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const o = ac.createBufferSource();
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o.buffer = noiseBuffer;
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o.loop = true;
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o.start(t);
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return {
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node: o,
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stop: (time) => {
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vibrato_oscillator?.stop(time);
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o.stop(time);
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},
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stop: (time) => o.stop(time)
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};
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}
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export function getOscillator({ s, freq, t, vib, vibmod, partials }) {
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// Make oscillator with partial count
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let o;
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if (['pink', 'white', 'brown'].includes(s)) {
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let noiseOscillator = getNoiseOscillator({ t: t, ac: getAudioContext(), type: s })
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return {
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node: noiseOscillator.node,
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stop: noiseOscillator.stop
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}
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} else {
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if (!partials || s === 'sine') {
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o = getAudioContext().createOscillator();
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o.type = s || 'triangle';
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} else {
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o = waveformN(partials, s);
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}
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o.frequency.value = Number(freq);
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o.start(t);
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// Additional oscillator for vibrato effect
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let vibrato_oscillator;
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if (vib > 0) {
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vibrato_oscillator = getAudioContext().createOscillator();
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vibrato_oscillator.frequency.value = vib;
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const gain = getAudioContext().createGain();
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// Vibmod is the amount of vibrato, in semitones
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gain.gain.value = vibmod * 100;
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vibrato_oscillator.connect(gain);
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gain.connect(o.detune);
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vibrato_oscillator.start(t);
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}
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return {
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node: o,
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stop: (time) => {
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vibrato_oscillator?.stop(time);
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o.stop(time);
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},
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};
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}
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}
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