hacklab/strudel
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

fix looping fonts

Browse source
This commit is contained in:
Felix Roos 2022-06-20 20:55:20 +02:00
parent 82d6103907
commit d5938a016c
5 changed files with 97 additions and 34 deletions
Download patch file Download diff file Expand all files Collapse all files

53
packages/soundfonts/fontloader.mjs
View file

@ -15,11 +15,35 @@ async function loadFont(name) {
return loadCache[name];
}
let bufferCache = {};
export async function getFontBufferSource(name, pitch, ac) {
const { buffer, zone } = await getFontPitch(name, pitch, ac);
const src = ac.createBufferSource();
src.buffer = buffer;
const baseDetune = zone.originalPitch - 100.0 * zone.coarseTune - zone.fineTune;
const playbackRate = 1.0 * Math.pow(2, (100.0 * pitch - baseDetune) / 1200.0);
// src detune?
src.playbackRate.value = playbackRate;
const loop = zone.loopStart > 1 && zone.loopStart < zone.loopEnd;
if (!loop) {
/* const waveDuration = duration + this.afterTime;
if (waveDuration > zone.buffer.duration / playbackRate) {
waveDuration = zone.buffer.duration / playbackRate;
// TODO: do sth with waveduration
} */
} else {
src.loop = true;
src.loopStart = zone.loopStart / zone.sampleRate;
src.loopEnd = zone.loopEnd / zone.sampleRate;
//+ (zone.delay ? zone.delay : 0);
}
return src;
}
let bufferCache = {};
export async function getFontPitch(name, pitch, ac) {
const key = `${name}:::${pitch}`;
if (bufferCache[key]) {
return (await bufferCache[key])();
return bufferCache[key];
}
// console.log('load buffer', key);
const load = async () => {
@ -35,31 +59,10 @@ export async function getFontBufferSource(name, pitch, ac) {
if (!buffer) {
throw new Error(`no soundfont buffer found for preset ${name}, pitch: ${pitch}`);
}
return () => {
const src = ac.createBufferSource();
src.buffer = buffer;
const baseDetune = zone.originalPitch - 100.0 * zone.coarseTune - zone.fineTune;
const playbackRate = 1.0 * Math.pow(2, (100.0 * pitch - baseDetune) / 1200.0);
// src detune?
src.playbackRate.value = playbackRate;
const loop = zone.loopStart > 1 && zone.loopStart < zone.loopEnd;
if (!loop) {
/* const waveDuration = duration + this.afterTime;
if (waveDuration > zone.buffer.duration / playbackRate) {
waveDuration = zone.buffer.duration / playbackRate;
// TODO: do sth with waveduration
} */
} else {
src.loop = true;
/* src.loopStart = zone.loopStart / zone.sampleRate + (zone.delay ? zone.delay : 0);
src.loopEnd = zone.loopEnd / zone.sampleRate + (zone.delay ? zone.delay : 0); */
}
return src;
};
return { buffer, zone };
};
bufferCache[key] = load(); // dont await here to cache promise immediately!
return (await bufferCache[key])();
return bufferCache[key];
}
function findZone(preset, pitch) {