audio capture/playback/alarm

web/src/audio.js

@@ -1,13 +1,8 @@
-// PTT audio pipeline.
-// Capture: AudioWorklet reads mic at 16 kHz, posts Int16 PCM chunks to the main
-// thread, which sends them over the WebSocket. Playback: incoming PCM chunks are
-// queued as AudioBuffers and played back-to-back.
-
 const WORKLET_SRC = `
 class PCMCapture extends AudioWorkletProcessor {
   process(inputs) {
     const input = inputs[0];
-    if (input && input[0] && input[0].length) {
+    if (input && input[0]) {
       const f32 = input[0];
       const i16 = new Int16Array(f32.length);
       for (let i = 0; i < f32.length; i++) {
@@ -35,12 +30,10 @@ export async function startCapture(onChunk) {
   const url = URL.createObjectURL(new Blob([WORKLET_SRC], { type: 'application/javascript' }));
   await ctx.audioWorklet.addModule(url);
   URL.revokeObjectURL(url);
-
   const source = ctx.createMediaStreamSource(stream);
   const node = new AudioWorkletNode(ctx, 'pcm-capture');
   node.port.onmessage = (e) => onChunk(e.data);
-  source.connect(node); // deliberately NOT connected to ctx.destination: no local feedback
-
+  source.connect(node); // not connected to destination -> no local feedback
   return {
     stop() {
       node.port.onmessage = null;