Initial commit

test_audio_wasm/index.js

@@ -0,0 +1,23 @@
+const { instance } = await WebAssembly.instantiateStreaming(fetch("beep.wasm"));
+
+let ctx = undefined;
+
+const count = 44100;
+const ptr = instance.exports.get_samples();
+
+async function playTone(frequency = 440) {
+  ctx ??= new AudioContext();
+  await ctx.resume();
+
+  instance.exports.beep(ctx.sampleRate, frequency);
+  const audioBuffer = ctx.createBuffer(1, count, ctx.sampleRate);
+  const audioChannel = audioBuffer.getChannelData(0);
+  audioChannel.set(new Float32Array(instance.exports.memory.buffer, ptr, count));
+
+  const src = ctx.createBufferSource();
+  src.buffer = audioBuffer;
+  src.connect(ctx.destination);
+  src.start();
+}
+
+window.addEventListener("click", () => playTone(440));