refactor boundary conditions

1 files changed, 46 insertions, 0 deletions

diff --git a/src/lib/sampler.js b/src/lib/sampler.js
new file mode 100644
index 0000000..0db53e1
--- /dev/null
+++ b/src/lib/sampler.js
@@ -0,0 +1,46 @@
+import * as Tone from "tone";
+import { choice, randrange } from "./util";
+import output from "./output";
+
+const PLAYER_COUNT = 4;
+
+export default class Sampler {
+  constructor({ samples, tonal }) {
+    this.tonal = tonal;
+    this.samples = samples.map(({ ...sample }) => {
+      sample.players = [];
+      sample.index = -1;
+      for (let i = 0; i < PLAYER_COUNT; i++) {
+        let fn = sample.fn;
+        if (window.location.href.match(/asdf.us/)) {
+          fn = "//asdf.us/kalimba/" + fn;
+        }
+        let player = new Tone.Player({
+          url: fn,
+          retrigger: true,
+          playbackRate: 1,
+        });
+        player.connect(output);
+        sample.players.push(player);
+      }
+      return sample;
+    });
+  }
+
+  play(time, options) {
+    const sound = options.index
+      ? this.samples[options.index]
+      : choice(this.samples);
+
+    sound.index = (sound.index + 1) % PLAYER_COUNT;
+
+    const player = sound.players[sound.index];
+
+    if (this.tonal) {
+      player.playbackRate =
+        (options.frequency * choice([0.5, 1]) + randrange(0, 10)) / sound.root;
+    }
+
+    player.start(time || 0);
+  }
+}