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Make faust.js work (thanks B.Matuszewski), add faust-params.js example.
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Lines changed: 119 additions & 25 deletions

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‎examples/faust-params.js‎

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// Example: Faust DSP with parameters and runtime tweaks using node-web-audio-api.
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// Requires: npm install @grame/faustwasm
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// Usage: node faust-params.js
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import { fileURLToPath } from 'node:url';
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import { AudioContext, AudioWorkletNode } from '../index.mjs';
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// Expose AudioWorkletNode globally so faustwasm can patch it into worklet factories.
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if (typeof globalThis.AudioWorkletNode === 'undefined') {
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globalThis.AudioWorkletNode = AudioWorkletNode;
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}
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const {
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instantiateFaustModuleFromFile,
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LibFaust,
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FaustCompiler,
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FaustMonoDspGenerator,
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} = await import('@grame/faustwasm/dist/esm/index.js');
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const audioContext = new AudioContext({ latencyHint: 'interactive' });
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// Stereo tone with controllable gain, pitch and filter cutoff.
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const dspCode = `
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import("stdfaust.lib");
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gain = hslider("gain[dB]", -6, -24, 6, 0.1) : ba.db2linear;
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freq = hslider("freq[Hz]", 220, 50, 2000, 1);
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cutoff = hslider("cutoff[Hz]", 800, 200, 4000, 1);
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process = vgroup("faust-params",
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os.osc(freq) * gain : fi.lowpass(2, cutoff)
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) <: _,_;
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`;
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// Load the Faust toolchain from the wasm distribution.
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const faustModule = await instantiateFaustModuleFromFile(
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fileURLToPath(import.meta.resolve('@grame/faustwasm/libfaust-wasm/libfaust-wasm.js')),
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fileURLToPath(import.meta.resolve('@grame/faustwasm/libfaust-wasm/libfaust-wasm.data')),
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fileURLToPath(import.meta.resolve('@grame/faustwasm/libfaust-wasm/libfaust-wasm.wasm')),
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);
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const libFaust = new LibFaust(faustModule);
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const compiler = new FaustCompiler(libFaust);
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const generator = new FaustMonoDspGenerator();
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const compiled = await generator.compile(compiler, 'faust-params', dspCode, '-ftz 2');
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if (!compiled) {
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throw new Error('Faust compilation failed');
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}
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const faustNode = await generator.createNode(audioContext);
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if (!faustNode) {
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throw new Error('Failed to create Faust node');
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}
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console.log('Faust parameterized node created.', faustNode);
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faustNode.connect(audioContext.destination);
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faustNode.start();
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// Helpers to inspect and tweak parameters. The parameter names come from the Faust UI paths.
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const params = faustNode.getParams?.() ?? [];
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console.log('Available parameters:', params);
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const set = (name, value) => {
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faustNode.setParamValue(name, value);
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console.log(`Set ${name} -> ${value}`);
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};
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const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
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// Parameter automation demo.
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set('/faust-params/gain', -12);
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set('/faust-params/freq', 220);
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set('/faust-params/cutoff', 800);
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set('/faust-params/resonance', 0.9);
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console.log('Sweeping parameters for 6 seconds...');
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await sleep(1500);
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set('/faust-params/freq', 440);
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set('/faust-params/cutoff', 1200);
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await sleep(1500);
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set('/faust-params/gain', -3);
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set('/faust-params/resonance', 1.8);
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await sleep(1500);
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set('/faust-params/freq', 660);
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set('/faust-params/cutoff', 1800);
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await sleep(1500);
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console.log('Stopping...');
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faustNode.stop();
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await audioContext.close();

‎examples/faust.js‎

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// Example: run a simple Faust oscillator graph using node-web-audio-api.
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// Requires: npm install @grame/faustwasm
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import path from 'node:path';
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// Usage: node faust.js
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import { fileURLToPath } from 'node:url';
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import { AudioContext, AudioWorkletNode } from '../index.mjs';
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import {
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instantiateFaustModuleFromFile,
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LibFaust,
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FaustCompiler,
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FaustMonoDspGenerator,
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} from '@grame/faustwasm/dist/esm/index.js';
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// Ensure the AudioWorkletNode constructor is available globally for faustwasm.
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// Expose AudioWorkletNode globally so faustwasm can patch it into worklet factories.
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if (typeof globalThis.AudioWorkletNode === 'undefined') {
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globalThis.AudioWorkletNode = AudioWorkletNode;
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}
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const __dirname = path.dirname(fileURLToPath(import.meta.url));
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const faustWasmDir = path.resolve(__dirname, '../node_modules/@grame/faustwasm/libfaust-wasm');
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const {
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instantiateFaustModuleFromFile,
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LibFaust,
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FaustCompiler,
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FaustMonoDspGenerator,
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} = await import('@grame/faustwasm/dist/esm/index.js');
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const latencyHint = process.env.WEB_AUDIO_LATENCY === 'playback' ? 'playback' : 'interactive';
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const audioContext = new AudioContext({ latencyHint });
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// Minimal Faust DSP: two sine oscillators mixed to stereo.
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const dspCode = `
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import("stdfaust.lib");
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process = os.osc(440);
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process = os.osc(440)*0.3, os.osc(800)*0.3;
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`;
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// Load the Faust toolchain from the wasm distribution.
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const faustModule = await instantiateFaustModuleFromFile(
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path.join(faustWasmDir, 'libfaust-wasm.js'),
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path.join(faustWasmDir, 'libfaust-wasm.data'),
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path.join(faustWasmDir, 'libfaust-wasm.wasm'),
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fileURLToPath(import.meta.resolve('@grame/faustwasm/libfaust-wasm/libfaust-wasm.js')),
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fileURLToPath(import.meta.resolve('@grame/faustwasm/libfaust-wasm/libfaust-wasm.data')),
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fileURLToPath(import.meta.resolve('@grame/faustwasm/libfaust-wasm/libfaust-wasm.wasm')),
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);
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const libFaust = new LibFaust(faustModule);
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const compiler = new FaustCompiler(libFaust);
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const generator = new FaustMonoDspGenerator();
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const compiled = await generator.compile(compiler, 'faust-osc', dspCode, '-I libraries/');
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const compiled = await generator.compile(compiler, 'faust-osc', dspCode, '-ftz 2');
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if (!compiled) {
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throw new Error('Faust compilation failed');
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}
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const faustNode = await generator.createNode(audioContext, 'faust-osc', generator.factory, false);
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const faustNode = await generator.createNode(audioContext);
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if (!faustNode) {
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throw new Error('Failed to create Faust node');
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}
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console.log('Faust node created successfully.', faustNode);
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//if (typeof faustNode.connect === 'function') {
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faustNode.connect(audioContext.destination);
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//}
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//if (typeof faustNode.start === 'function') {
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faustNode.start();
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//}
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await audioContext.resume();
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faustNode.connect(audioContext.destination);
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faustNode.start();
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console.log('Faust oscillator playing for 4 seconds...');
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await new Promise(resolve => setTimeout(resolve, 4000));

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