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refactor: align voice-call TTS with core config

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This commit is contained in:
Peter Steinberger
2026-01-25 09:29:50 +00:00
parent 9366cbc7db
commit 83f92e34af
18 changed files with 769 additions and 69 deletions
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28
extensions/voice-call/src/providers/twilio.ts
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@@ -15,9 +15,9 @@ import type {
WebhookVerificationResult,
} from "../types.js";
import { escapeXml, mapVoiceToPolly } from "../voice-mapping.js";
import { chunkAudio } from "../telephony-audio.js";
import type { TelephonyTtsProvider } from "../telephony-tts.js";
import type { VoiceCallProvider } from "./base.js";
import type { OpenAITTSProvider } from "./tts-openai.js";
import { chunkAudio } from "./tts-openai.js";
import { twilioApiRequest } from "./twilio/api.js";
import { verifyTwilioProviderWebhook } from "./twilio/webhook.js";
@@ -53,8 +53,8 @@ export class TwilioProvider implements VoiceCallProvider {
/** Current public webhook URL (set when tunnel starts or from config) */
private currentPublicUrl: string | null = null;
/** Optional OpenAI TTS provider for streaming TTS */
private ttsProvider: OpenAITTSProvider | null = null;
/** Optional telephony TTS provider for streaming TTS */
private ttsProvider: TelephonyTtsProvider | null = null;
/** Optional media stream handler for sending audio */
private mediaStreamHandler: MediaStreamHandler | null = null;
@@ -119,7 +119,7 @@ export class TwilioProvider implements VoiceCallProvider {
return this.currentPublicUrl;
}
setTTSProvider(provider: OpenAITTSProvider): void {
setTTSProvider(provider: TelephonyTtsProvider): void {
this.ttsProvider = provider;
}
@@ -454,13 +454,13 @@ export class TwilioProvider implements VoiceCallProvider {
* Play TTS audio via Twilio.
*
* Two modes:
* 1. OpenAI TTS + Media Streams: If TTS provider and media stream are available,
* generates audio via OpenAI and streams it through WebSocket (preferred).
* 1. Core TTS + Media Streams: If TTS provider and media stream are available,
* generates audio via core TTS and streams it through WebSocket (preferred).
* 2. TwiML <Say>: Falls back to Twilio's native TTS with Polly voices.
* Note: This may not work on all Twilio accounts.
*/
async playTts(input: PlayTtsInput): Promise<void> {
// Try OpenAI TTS via media stream first (if configured)
// Try telephony TTS via media stream first (if configured)
const streamSid = this.callStreamMap.get(input.providerCallId);
if (this.ttsProvider && this.mediaStreamHandler && streamSid) {
try {
@@ -468,7 +468,7 @@ export class TwilioProvider implements VoiceCallProvider {
return;
} catch (err) {
console.warn(
`[voice-call] OpenAI TTS failed, falling back to Twilio <Say>:`,
`[voice-call] Telephony TTS failed, falling back to Twilio <Say>:`,
err instanceof Error ? err.message : err,
);
// Fall through to TwiML <Say> fallback
@@ -484,7 +484,7 @@ export class TwilioProvider implements VoiceCallProvider {
}
console.warn(
"[voice-call] Using TwiML <Say> fallback - OpenAI TTS not configured or media stream not active",
"[voice-call] Using TwiML <Say> fallback - telephony TTS not configured or media stream not active",
);
const pollyVoice = mapVoiceToPolly(input.voice);
@@ -502,8 +502,8 @@ export class TwilioProvider implements VoiceCallProvider {
}
/**
* Play TTS via OpenAI and Twilio Media Streams.
* Generates audio with OpenAI TTS, converts to mu-law, and streams via WebSocket.
* Play TTS via core TTS and Twilio Media Streams.
* Generates audio with core TTS, converts to mu-law, and streams via WebSocket.
* Uses a jitter buffer to smooth out timing variations.
*/
private async playTtsViaStream(
@@ -514,8 +514,8 @@ export class TwilioProvider implements VoiceCallProvider {
throw new Error("TTS provider and media stream handler required");
}
// Generate audio with OpenAI TTS (returns mu-law at 8kHz)
const muLawAudio = await this.ttsProvider.synthesizeForTwilio(text);
// Generate audio with core TTS (returns mu-law at 8kHz)
const muLawAudio = await this.ttsProvider.synthesizeForTelephony(text);
// Stream audio in 20ms chunks (160 bytes at 8kHz mu-law)
const CHUNK_SIZE = 160;