mirror of
https://github.com/eliasstepanik/strudel-docker.git
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c40078ffc9
- better timing - can now pass instrument to .csound(...) - can now write instruments with csound(...)
73 lines
2.4 KiB
JavaScript
73 lines
2.4 KiB
JavaScript
import { getFrequency, logger, Pattern } from '@strudel.cycles/core';
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import { Csound } from '@csound/browser'; // TODO: use dynamic import for code splitting..
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import { csd } from './csd.mjs';
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import { getAudioContext } from '@strudel.cycles/webaudio';
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let csoundLoader, _csound;
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// triggers given instrument name using csound. expects csound function to be called in advance `await csound()`
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Pattern.prototype._csound = function (instrument) {
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instrument = instrument || 'triangle';
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return this.onTrigger((time, hap, currentTime) => {
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if (!_csound) {
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logger('[csound] not loaded yet', 'warning');
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return;
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}
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let { gain = 0.8 } = hap.value;
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gain *= 0.2;
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// const midi = toMidi(getPlayableNoteValue(hap));
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const freq = getFrequency(hap);
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// TODO: find out how to send a precise ctx based time
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// http://www.csounds.com/manual/html/i.html
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const params = [
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`"${instrument}"`, // p1: instrument name
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time - currentTime, //.toFixed(precision), // p2: starting time in arbitrary unit called beats
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hap.duration + 0, // p3: duration in beats
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// instrument specific params:
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freq, //.toFixed(precision), // p4: frequency
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// -48 + gain * 24, // p5: gain
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gain, // p5: gain
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];
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const msg = `i ${params.join(' ')}`;
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// console.log('msg', msg);
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_csound.inputMessage(msg);
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// _csound.readScore(msg); // slower alternative
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// even slower alternative:
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/* const code = `schedule(${params.join(', ')})`;
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_csound.evalCode(code); */
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});
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};
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// initializes csound + can be used to reevaluate given instrument code
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export async function csound(code = '') {
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code = csd(code);
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let isInit = false;
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if (!csoundLoader) {
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isInit = true;
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csoundLoader = (async () => {
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_csound = await Csound({ audioContext: getAudioContext() });
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await _csound.setOption('-m0');
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await _csound.compileCsdText(code);
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await _csound.start();
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})();
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}
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await csoundLoader;
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!isInit && (await _csound?.compileCsdText(code));
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}
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// experimental: allows using jsx to eval csound
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window.jsxPragma = function (fn, args, text) {
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return fn(text);
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};
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// experimental: for use via JSX as <CsInstruments>...</CsInstruments>
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export function CsInstruments(text) {
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if (Array.isArray(text)) {
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text = text[0];
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}
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return csound(text);
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}
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Pattern.prototype.define('csound', (a, pat) => pat.csound(a), { composable: false, patternified: true });
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