import { createWasmCodec } from "./wasm-base.js";

function aacMagic(bytes: Uint8Array): boolean {
    if (bytes.byteLength < 2) return false;
    // ADTS sync word: 0xFFFx
    return bytes[0] === 0xff && (bytes[1]! & 0xf0) === 0xf0;
}

/** Lazy AAC codec backed by `@audio/decode-aac`. Decode-only. */
export const AacCodec = createWasmCodec({
    name: "aac",
    extensions: ["aac", "m4a"],
    mimeTypes: ["audio/aac", "audio/mp4"],
    module: "@audio/decode-aac",
    magic: aacMagic,
    supportsEncode: false,
    load: () =>
        // @ts-expect-error optional dependency resolved at runtime
        import("@audio/decode-aac"),
});