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// Opus codec wrapper. Uses the native @discordjs/opus addon when it happens to
// be installed (faster), otherwise opusscript (WASM): no compiler needed, so it
// installs cleanly on arm64 SBCs.
import { createRequire } from "node:module";
const require = createRequire(import.meta.url);
export const SAMPLE_RATE = 48_000;
export const FRAME_SAMPLES = 960; // 20 ms @ 48 kHz
export const FRAME_BYTES = FRAME_SAMPLES * 2; // mono Int16
let backend = null;
function loadBackend() {
if (backend) return backend;
try {
const { OpusEncoder } = require("@discordjs/opus");
backend = {
name: "@discordjs/opus (native)",
create(channels) {
const codec = new OpusEncoder(SAMPLE_RATE, channels);
return {
encode: (pcm) => codec.encode(pcm),
decode: (data) => codec.decode(data),
setBitrate: (bps) => codec.setBitrate(bps),
dispose() {},
};
},
};
} catch {
const OpusScript = require("opusscript");
backend = {
name: "opusscript (wasm)",
create(channels) {
const codec = new OpusScript(SAMPLE_RATE, channels, OpusScript.Application.VOIP);
return {
encode: (pcm) => Buffer.from(codec.encode(pcm, pcm.length / (2 * channels))),
decode: (data) => Buffer.from(codec.decode(data)),
setBitrate: (bps) => codec.setBitrate(bps),
dispose: () => codec.delete(),
};
},
};
}
return backend;
}
export function opusBackendName() {
return loadBackend().name;
}
/** Mono 48 kHz Opus codec (encoder + decoder state). */
export function createOpusCodec({ bitrate } = {}) {
const codec = loadBackend().create(1);
if (bitrate) {
try { codec.setBitrate(bitrate); } catch { /* keep the library default */ }
}
return codec;
}
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