built in webaudio prebake ?

2026-09-05 06:57:35 -04:00 · 2022-07-01 10:45:43 +02:00
parent e44313f631
commit 5cf9f9fef4
2 changed files with 84 additions and 0 deletions
@@ -8,3 +8,4 @@ export * from './clockworker.mjs';
 export * from './scheduler.mjs';
 export * from './webaudio.mjs';
 export * from './sampler.mjs';
+export * from './prebake.mjs';
@@ -0,0 +1,83 @@
+import { Pattern, toMidi } from '@strudel.cycles/core';
+import { samples } from '.';
+
+let baking;
+
+export function prebake(props) {
+  if (baking) {
+    return baking;
+  }
+  baking = prebaker(props);
+  return baking;
+}
+
+async function prebaker(props = {}) {
+  const { baseURL = './samples' } = props; // http://localhost:1234
+  try {
+    samples(
+      {
+        piano: {
+          A0: 'A0v8.mp3',
+          C1: 'C1v8.mp3',
+          Ds1: 'Ds1v8.mp3',
+          Fs1: 'Fs1v8.mp3',
+          A1: 'A1v8.mp3',
+          C2: 'C2v8.mp3',
+          Ds2: 'Ds2v8.mp3',
+          Fs2: 'Fs2v8.mp3',
+          A2: 'A2v8.mp3',
+          C3: 'C3v8.mp3',
+          Ds3: 'Ds3v8.mp3',
+          Fs3: 'Fs3v8.mp3',
+          A3: 'A3v8.mp3',
+          C4: 'C4v8.mp3',
+          Ds4: 'Ds4v8.mp3',
+          Fs4: 'Fs4v8.mp3',
+          A4: 'A4v8.mp3',
+          C5: 'C5v8.mp3',
+          Ds4: 'Ds4v8.mp3',
+          Fs5: 'Fs5v8.mp3',
+          A5: 'A5v8.mp3',
+          C6: 'C6v8.mp3',
+          Ds6: 'Ds6v8.mp3',
+          Fs6: 'Fs6v8.mp3',
+          A6: 'A6v8.mp3',
+          C7: 'C7v8.mp3',
+          Ds7: 'Ds7v8.mp3',
+          Fs7: 'Fs7v8.mp3',
+          A7: 'A7v8.mp3',
+          C8: 'C8v8.mp3',
+        },
+      },
+      // https://archive.org/details/SalamanderGrandPianoV3
+      // License: CC-by http://creativecommons.org/licenses/by/3.0/ Author: Alexander Holm
+      baseURL + '/piano/',
+    );
+
+    const maxPan = toMidi('C8');
+    const panwidth = (pan, width) => pan * width + (1 - width) / 2;
+
+    Pattern.prototype.piano = function () {
+      return this.clip(1)
+        .s('piano')
+        .fmap((value) => {
+          // pan by pitch
+          const pan = panwidth(Math.min(toMidi(value.note) / maxPan, 1), 0.5);
+          return { ...value, pan: (value.pan || 1) * pan };
+        });
+    };
+
+    // ping sample server
+    /* await fetch(samplerURL)
+      .then(() => {
+        console.log(`prebake: Using samples from "${baseURL}"`);
+      })
+      .catch(() => {
+        throw new Error(
+          `sample server not running at "${samplerURL}"... run "npm run sampler" from the strudel project root.`,
+        );
+      }); */
+  } catch (e) {
+    console.warn('prebake error', e);
+  }
+}