G.711 Mu-Law Codec

Encode and decode between linear PCM and the 8kHz mu-law byte format Twilio Media Streams speaks. Zero dependencies and no native build step, which matters because the usual answer pulls in a full audio toolchain to do table lookups.

The silent failure this avoids: a sign or bias error in the companding table produces audio that plays, quieter or distorted or with a persistent hiss, rather than failing. Tested against reference vectors, so a wrong table cannot pass.

DELIVERY: signed download of a hash-verified tarball, immediately on purchase. Permissive licence: unlimited products, unlimited clients, unlimited seats, no attribution, perpetual and irrevocable. One restriction, do not republish the source as source.

Interface

What you call, and what comes back. Types and signatures only — the implementation ships with the source.

  export function mulawDecode(bytes: Uint8Array): Int16Array;
  export function mulawDecodeBase64(b64: string): Int16Array;
  export function mulawEncodeSample(sample: number): number;
  export function mulawEncode(samples: Int16Array): Uint8Array;
  export function mulawEncodeBase64FromS16LE(bytes: Uint8Array): string;
  export function mulawEncodeBase64FromFloat32(samples: Float32Array): string;