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Adding vibrato to Superdough sampler

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Modulating the `playbackRate` to simulate a vibrato!
This commit is contained in:
Raphael Forment 2023-09-20 19:44:32 +02:00
parent 9e27c0fe2c
commit 08aab9d4d8
1 changed files with 19 additions and 5 deletions
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24
packages/superdough/sampler.mjs
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@ -22,7 +22,7 @@ function humanFileSize(bytes, si) {
return bytes.toFixed(1) + ' ' + units[u];
}
export const getSampleBufferSource = async (s, n, note, speed, freq, bank, resolveUrl) => {
export const getSampleBufferSource = async (s, n, note, speed, freq, vib, vibmod, bank, resolveUrl) => {
let transpose = 0;
if (freq !== undefined && note !== undefined) {
logger('[sampler] hap has note and freq. ignoring note', 'warning');
@ -57,8 +57,20 @@ export const getSampleBufferSource = async (s, n, note, speed, freq, bank, resol
const bufferSource = ac.createBufferSource();
bufferSource.buffer = buffer;
const playbackRate = 1.0 * Math.pow(2, transpose / 12);
// bufferSource.playbackRate.value = Math.pow(2, transpose / 12);
bufferSource.playbackRate.value = playbackRate;
if (vib > 0) {
let vibrato_oscillator = getAudioContext().createOscillator();
vibrato_oscillator.frequency.value = vib;
const gain = getAudioContext().createGain();
// Vibmod is the amount of vibrato, in semitones
bufferSource.playbackRate.value = Math.pow(2, transpose / 12);
gain.gain.value = vibmod / 4;
vibrato_oscillator.connect(gain);
gain.connect(bufferSource.playbackRate);
vibrato_oscillator.start(0);
} else {
bufferSource.playbackRate.value = Math.pow(2, transpose / 12);
bufferSource.playbackRate.value = playbackRate;
}
return bufferSource;
};
@ -211,6 +223,8 @@ export async function onTriggerSample(t, value, onended, bank, resolveUrl) {
begin = 0,
loopEnd = 1,
end = 1,
vib,
vibmod = 0.5,
} = value;
// load sample
if (speed === 0) {
@ -224,7 +238,7 @@ export async function onTriggerSample(t, value, onended, bank, resolveUrl) {
//const soundfont = getSoundfontKey(s);
const time = t + nudge;
const bufferSource = await getSampleBufferSource(s, n, note, speed, freq, bank, resolveUrl);
const bufferSource = await getSampleBufferSource(s, n, note, speed, freq, vib, vibmod, bank, resolveUrl);
// asny stuff above took too long?
if (ac.currentTime > t) {
@ -255,7 +269,7 @@ export async function onTriggerSample(t, value, onended, bank, resolveUrl) {
bufferSource.connect(envelope);
const out = ac.createGain(); // we need a separate gain for the cutgroups because firefox...
envelope.connect(out);
bufferSource.onended = function () {
bufferSource.onended = function() {
bufferSource.disconnect();
envelope.disconnect();
out.disconnect();