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refactor(extensions): reuse shared helper primitives

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This commit is contained in:
Peter Steinberger
2026-03-07 10:40:57 +00:00
parent 3c71e2bd48
commit 1aa77e4603
58 changed files with 1567 additions and 2195 deletions
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51
extensions/voice-call/src/providers/tts-openai.ts
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@@ -1,3 +1,5 @@
import { pcmToMulaw } from "../telephony-audio.js";
/**
* OpenAI TTS Provider
*
@@ -179,55 +181,6 @@ function clamp16(value: number): number {
return Math.max(-32768, Math.min(32767, value));
}
/**
* Convert 16-bit PCM to 8-bit mu-law.
* Standard G.711 mu-law encoding for telephony.
*/
function pcmToMulaw(pcm: Buffer): Buffer {
const samples = pcm.length / 2;
const mulaw = Buffer.alloc(samples);
for (let i = 0; i < samples; i++) {
const sample = pcm.readInt16LE(i * 2);
mulaw[i] = linearToMulaw(sample);
}
return mulaw;
}
/**
* Convert a single 16-bit linear sample to 8-bit mu-law.
* Implements ITU-T G.711 mu-law encoding.
*/
function linearToMulaw(sample: number): number {
const BIAS = 132;
const CLIP = 32635;
// Get sign bit
const sign = sample < 0 ? 0x80 : 0;
if (sample < 0) {
sample = -sample;
}
// Clip to prevent overflow
if (sample > CLIP) {
sample = CLIP;
}
// Add bias and find segment
sample += BIAS;
let exponent = 7;
for (let expMask = 0x4000; (sample & expMask) === 0 && exponent > 0; exponent--, expMask >>= 1) {
// Find the segment (exponent)
}
// Extract mantissa bits
const mantissa = (sample >> (exponent + 3)) & 0x0f;
// Combine into mu-law byte (inverted for transmission)
return ~(sign | (exponent << 4) | mantissa) & 0xff;
}
/**
* Convert 8-bit mu-law to 16-bit linear PCM.
* Useful for decoding incoming audio.