node + superdirt experiment

.eslintignore

@@ -21,4 +21,5 @@ vite.config.js
 /src-tauri/target/**/*
 reverbGen.mjs
 hydra.mjs
-jsdoc-synonyms.js
+jsdoc-synonyms.js
+packages/node/pattern.mjs

.prettierignore

@@ -11,3 +11,4 @@ pnpm-lock.yaml
 pnpm-workspace.yaml
 **/dev-dist
 website/.astro
+packages/node/pattern.mjs

packages/node/README.md

@@ -0,0 +1,19 @@
+# @strudel/node
+
+This is an experiment to run strudel in node.
+
+## Usage
+
+```sh
+# Setup
+# - make sure node >= 20 is installed
+# - make sure pnpm is installed
+cd packages/node
+pnpm i
+# Usage
+pnpm start
+```
+
+Then run `sclang` with superdirt in another terminal.
+
+You can now edit and save the file `pattern.mjs` to update your pattern!

packages/node/node-web-audio-api.mjs

@@ -0,0 +1,64 @@
+import { createClock, evalScope } from '@strudel/core';
+import { evaluate } from '@strudel/transpiler';
+import watch from 'node-watch';
+import fs from 'node:fs/promises';
+import { AudioContext, OscillatorNode, GainNode } from 'node-web-audio-api';
+
+const audioContext = new AudioContext();
+
+let file = 'pattern.mjs';
+let pattern;
+async function evaluateFile() {
+  try {
+    console.log('// file evaluated:');
+    const code = await fs.readFile(file, { encoding: 'utf8' });
+    console.log(code);
+    const res = await evaluate(code);
+    pattern = res.pattern;
+  } catch (err) {
+    console.error(err);
+  }
+}
+
+// const getTime = () => performance.now() / 1000;
+const getTime = () => audioContext.currentTime;
+let minLatency = 50;
+async function main() {
+  await evalScope(import('@strudel/core'), import('@strudel/mini'), import('@strudel/tonal'));
+  await evaluateFile();
+  watch(file, { recursive: true }, () => evaluateFile());
+  let lastEnd;
+  const clock = createClock(getTime, (phase) => {
+    if (!lastEnd) {
+      lastEnd = phase;
+      return;
+    }
+    const haps = pattern.queryArc(lastEnd, phase);
+    lastEnd = phase;
+    const cps = 1;
+    const cycle = Math.floor(phase);
+    haps
+      .filter((h) => h.hasOnset())
+      .forEach((hap) => {
+        const env = new GainNode(audioContext, { gain: 0 });
+        const { attack = 0.01, gain = 1 } = hap.value;
+        env.connect(audioContext.destination);
+        const now = hap.whole.begin;
+        const duration = hap.duration;
+        env.gain
+          .setValueAtTime(0, now)
+          .linearRampToValueAtTime(gain * 0.2, now + attack)
+          .exponentialRampToValueAtTime(0.0001, now + duration);
+        const frequency = hap.value.freq;
+
+        const osc = new OscillatorNode(audioContext, { frequency });
+        osc.connect(env);
+        osc.start(now);
+        osc.stop(now + duration);
+      });
+  });
+
+  clock.start();
+}
+
+main();

packages/node/osc-superdirt.mjs

@@ -0,0 +1,76 @@
+import { createClock, evalScope } from '@strudel/core';
+import { evaluate } from '@strudel/transpiler';
+import OSC from 'osc-js';
+import watch from 'node-watch';
+import fs from 'node:fs/promises';
+
+const config = {
+  receiver: 'udp', // @param {string} Where messages sent via 'send' method will be delivered to, 'ws' for Websocket clients, 'udp' for udp client
+  open: {
+    host: 'localhost', // @param {string} Hostname of udp server to bind to
+    port: 57121, // @param {number} Port of udp client for messaging
+    // enabling the following line will receive tidal messages:
+    // port: 57120, // @param {number} Port of udp client for messaging
+    exclusive: false, // @param {boolean} Exclusive flag
+  },
+  send: {
+    host: 'localhost', // @param {string} Hostname of udp client for messaging
+    port: 57120, // @param {number} Port of udp client for messaging
+  },
+};
+
+const osc = new OSC({ plugin: new OSC.DatagramPlugin(config) });
+
+osc.open(); // start a WebSocket server on port 8080
+
+console.log('osc client running on port', config.open.port);
+console.log('osc server running on port', config.send.port);
+
+let file = 'pattern.mjs';
+let pattern;
+async function evaluateFile() {
+  try {
+    console.log('// file evaluated:');
+    const code = await fs.readFile(file, { encoding: 'utf8' });
+    console.log(code);
+    const res = await evaluate(code);
+    pattern = res.pattern;
+  } catch (err) {
+    console.error(err);
+  }
+}
+
+const getTime = () => performance.now() / 1000;
+async function main() {
+  await evalScope(import('@strudel/core'), import('@strudel/mini'), import('@strudel/tonal'));
+  await evaluateFile();
+  watch(file, { recursive: true }, () => evaluateFile());
+  let lastEnd;
+  let minLatency = 50;
+  const clock = createClock(getTime, (phase) => {
+    if (!lastEnd) {
+      lastEnd = phase;
+      return;
+    }
+    const haps = pattern.queryArc(lastEnd, phase);
+    lastEnd = phase;
+    const cps = 1;
+    const cycle = Math.floor(phase);
+    haps
+      .filter((h) => h.hasOnset())
+      .forEach((hap) => {
+        const delta = hap.duration.valueOf();
+        const controls = Object.assign({}, { cps, cycle, delta }, hap.value);
+        const keyvals = Object.entries(controls).flat();
+        const ts = Math.floor(performance.timeOrigin + hap.whole.begin * 1000 + minLatency);
+        const message = new OSC.Message('/dirt/play', ...keyvals);
+        const bundle = new OSC.Bundle([message], ts);
+        bundle.timestamp(ts); // workaround for https://github.com/adzialocha/osc-js/issues/60
+        osc.send(bundle);
+      });
+  });
+
+  clock.start();
+}
+
+main();

packages/node/package.json

@@ -0,0 +1,37 @@
+{
+  "name": "@strudel/node",
+  "version": "1.1.0",
+  "description": "Strudel running in node",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/tidalcycles/strudel.git"
+  },
+  "main": "index.mjs",
+  "scripts": {
+    "osc": "node osc-superdirt.mjs",
+    "waa": "node node-web-audio-api.mjs"
+  },
+  "keywords": [
+    "tidalcycles",
+    "strudel",
+    "pattern",
+    "livecoding",
+    "algorave"
+  ],
+  "author": "Felix Roos <[email protected]>",
+  "license": "AGPL-3.0-or-later",
+  "bugs": {
+    "url": "https://github.com/tidalcycles/strudel/issues"
+  },
+  "homepage": "https://github.com/tidalcycles/strudel#readme",
+  "dependencies": {
+    "@strudel/core": "workspace:*",
+    "@strudel/mini": "workspace:*",
+    "@strudel/osc": "workspace:*",
+    "@strudel/tonal": "workspace:*",
+    "@strudel/transpiler": "workspace:*",
+    "node-watch": "^0.7.4",
+    "node-web-audio-api": "^0.20.0",
+    "osc-js": "^2.4.0"
+  }
+}

packages/node/pattern.mjs

@@ -0,0 +1,2 @@
+freq("110 220 [330 440,550,660]")
+.attack(.1).gain(.4)