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perf(pcm-player): ⚡ Optimize PCM audio processing for better playback efficiency

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Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>
This commit is contained in:
Claude Code 2026-04-04 03:53:39 -07:00
parent 13569cbbe9
commit 3efc298cd1
1 changed files with 14 additions and 8 deletions
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22
@applications/web/src/worklets/pcm-player.js
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@ -21,8 +21,9 @@
*/
const INPUT_SAMPLE_RATE = 22050;
/** Ring buffer capacity in samples (≈1.5 seconds at 22050Hz) */
const RING_CAPACITY = 32768; // must be power of 2
/** Ring buffer capacity in samples (≈5.95 seconds at 22050Hz).
* Must be a power of 2. Sized to hold a full TTS segment (typically 2–4s). */
const RING_CAPACITY = 131072; // 2^17
class PcmPlayerProcessor extends AudioWorkletProcessor {
constructor() {
@ -59,20 +60,25 @@ class PcmPlayerProcessor extends AudioWorkletProcessor {
const int16 = new Int16Array(buffer);
const incoming = int16.length;
// Check for overrun — drop oldest samples to make room
// If the incoming chunk is larger than the ring, keep only the last RING_CAPACITY samples
// (i.e. drop the oldest part of a very long chunk rather than corrupting state).
const srcOffset = incoming > RING_CAPACITY ? incoming - RING_CAPACITY : 0;
const writeCount = incoming - srcOffset;
// Drop oldest buffered samples to make room — never go below zero
const freeSpace = RING_CAPACITY - this._available;
if (incoming > freeSpace) {
const drop = incoming - freeSpace;
if (writeCount > freeSpace) {
const drop = Math.min(writeCount - freeSpace, this._available);
this._readHead = (this._readHead + drop) & (RING_CAPACITY - 1);
this._available -= drop;
}
// Write Int16 → Float32 into ring
for (let i = 0; i < incoming; i++) {
this._ring[this._writeHead] = int16[i] / 32768.0;
for (let i = 0; i < writeCount; i++) {
this._ring[this._writeHead] = int16[srcOffset + i] / 32768.0;
this._writeHead = (this._writeHead + 1) & (RING_CAPACITY - 1);
}
this._available += incoming;
this._available += writeCount;
}
/**