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fix: XTTS splits concatenated audio into ~8s parts (seamless with preload) 

- All chunks rendered and PCM concatenated (consistent voice)
- Split into ~8 second WAV parts (not per-sentence)
- 8s is long enough for preload overlap, small enough for WebSocket
- Parts include part/totalParts metadata

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
duffyduck 2026-04-10 02:41:14 +02:00
parent 2c785cb37a
commit 81f7c38383
1 changed files with 29 additions and 27 deletions
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56
xtts/bridge.js
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@ -187,45 +187,47 @@ async function handleTTSRequest(payload) {
const completeWav = Buffer.concat([wavHeader, allPcm]);
const base64 = completeWav.toString("base64");
// Wenn zu gross (>800KB PCM) → in Teile splitten, sonst als Ganzes senden
const MAX_PCM_SIZE = 800 * 1024; // ~800KB PCM pro Nachricht
// In ~8 Sekunden Teile splitten (nahtlos genug fuer Queue, klein genug fuer WebSocket)
const samplesPerSec = sampleRate * channels * (bitsPerSample / 8);
const TARGET_SECS = 8; // ~8 Sekunden pro Teil
const targetBytes = samplesPerSec * TARGET_SECS;
const pcmParts = [];
if (allPcm.length > MAX_PCM_SIZE) {
for (let offset = 0; offset < allPcm.length; offset += MAX_PCM_SIZE) {
pcmParts.push(allPcm.slice(offset, Math.min(offset + MAX_PCM_SIZE, allPcm.length)));
}
} else {
pcmParts.push(allPcm);
for (let offset = 0; offset < allPcm.length; offset += targetBytes) {
pcmParts.push(allPcm.slice(offset, Math.min(offset + targetBytes, allPcm.length)));
}
function buildWav(pcmData) {
const header = Buffer.alloc(44);
header.write("RIFF", 0);
header.writeUInt32LE(36 + pcmData.length, 4);
header.write("WAVE", 8);
header.write("fmt ", 12);
header.writeUInt32LE(16, 16);
header.writeUInt16LE(1, 20);
header.writeUInt16LE(channels, 22);
header.writeUInt32LE(sampleRate, 24);
header.writeUInt32LE(byteRate, 28);
header.writeUInt16LE(blockAlign, 32);
header.writeUInt16LE(bitsPerSample, 34);
header.write("data", 36);
header.writeUInt32LE(pcmData.length, 40);
return Buffer.concat([header, pcmData]);
}
for (let p = 0; p < pcmParts.length; p++) {
const partPcm = pcmParts[p];
const partHeader = Buffer.alloc(44);
partHeader.write("RIFF", 0);
partHeader.writeUInt32LE(36 + partPcm.length, 4);
partHeader.write("WAVE", 8);
partHeader.write("fmt ", 12);
partHeader.writeUInt32LE(16, 16);
partHeader.writeUInt16LE(1, 20);
partHeader.writeUInt16LE(channels, 22);
partHeader.writeUInt32LE(sampleRate, 24);
partHeader.writeUInt32LE(byteRate, 28);
partHeader.writeUInt16LE(blockAlign, 32);
partHeader.writeUInt16LE(bitsPerSample, 34);
partHeader.write("data", 36);
partHeader.writeUInt32LE(partPcm.length, 40);
const partWav = Buffer.concat([partHeader, partPcm]);
const partBase64 = partWav.toString("base64");
const partWav = buildWav(pcmParts[p]);
sendToRVS({
type: "xtts_response",
payload: {
requestId: `${requestId || ""}${pcmParts.length > 1 ? '_' + p : ''}`,
base64: partBase64,
base64: partWav.toString("base64"),
mimeType: "audio/wav",
voice: voice || "default",
engine: "xtts",
part: p + 1,
totalParts: pcmParts.length,
},
timestamp: Date.now(),
});