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Tts stream auto flush #1462

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Tts stream auto flush #1462

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c0c5799
Add configurable TTS stream auto flush on sentence boundary
vdharashive Dec 6, 2025
36377de
Revert TaskSay changes; keep TTS auto flush in buffer only
vdharashive Dec 6, 2025
e7a0182
Merge branch 'main' into tts_stream_auto_flush
vdharashive Dec 11, 2025
ebac417
Merge branch 'main' into tts_stream_auto_flush
vdharashive Dec 12, 2025
6e08f45
Merge branch 'main' into tts_stream_auto_flush
vdharashive Dec 17, 2025
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4 changes: 4 additions & 0 deletions lib/config.js
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,9 @@ const JAMBONES_GATHER_EARLY_HINTS_MATCH = process.env.JAMBONES_GATHER_EARLY_HINT
const JAMBONZ_GATHER_EARLY_HINTS_MATCH = process.env.JAMBONZ_GATHER_EARLY_HINTS_MATCH;
const JAMBONES_GATHER_CLEAR_GLOBAL_HINTS_ON_EMPTY_HINTS = process.env.JAMBONES_GATHER_CLEAR_GLOBAL_HINTS_ON_EMPTY_HINTS;

/* tts streaming */
const JAMBONES_TTS_STREAM_AUTO_FLUSH = process.env.JAMBONES_TTS_STREAM_AUTO_FLUSH === 'true';

const SMPP_URL = process.env.SMPP_URL;

/* drachtio */
Expand Down Expand Up @@ -164,6 +167,7 @@ module.exports = {
JAMBONES_GATHER_EARLY_HINTS_MATCH,
JAMBONZ_GATHER_EARLY_HINTS_MATCH,
JAMBONES_GATHER_CLEAR_GLOBAL_HINTS_ON_EMPTY_HINTS,
JAMBONES_TTS_STREAM_AUTO_FLUSH,
JAMBONES_FREESWITCH,
SMPP_URL,
JAMBONES_NETWORK_CIDR,
Expand Down
12 changes: 11 additions & 1 deletion lib/utils/tts-streaming-buffer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ const {
TtsStreamingEvents,
TtsStreamingConnectionStatus
} = require('../utils/constants');
const { JAMBONES_TTS_STREAM_AUTO_FLUSH } = require('../config');

const MAX_CHUNK_SIZE = 1800;
const HIGH_WATER_BUFFER_SIZE = 1000;
Expand Down Expand Up @@ -259,8 +260,12 @@ class TtsStreamingBuffer extends Emitter {
}

const limit = Math.min(MAX_CHUNK_SIZE, combinedText.length);
let isSentenceBoundaryChunk = false;
let chunkEnd = findSentenceBoundary(combinedText, limit);
if (chunkEnd <= 0) {
if (chunkEnd > 0) {
isSentenceBoundaryChunk = true;
}
else {
if (handlingTimeout) {
chunkEnd = findWordBoundary(combinedText, limit);
if (chunkEnd <= 0) {
Expand Down Expand Up @@ -321,6 +326,11 @@ class TtsStreamingBuffer extends Emitter {
this.logger.info({ err, chunk }, 'TtsStreamingBuffer:_feedQueue Error sending TTS chunk');
}

// Optionally flush on sentence boundaries if the feature flag is enabled.
if (JAMBONES_TTS_STREAM_AUTO_FLUSH && isSentenceBoundaryChunk) {
await this._doFlush();
}

if (this._isFull && this.bufferedLength <= LOW_WATER_BUFFER_SIZE) {
this.logger.info('TtsStreamingBuffer throttling: buffer is no longer full - resuming');
this._isFull = false;
Expand Down