/**
 * libopus, built by codec/opus/build.sh, without Emscripten's JS: one import, a few exports.
 * Takes the module's bytes, so a worklet, a page and Node all load it the same way (GRYT-1818).
 */
/** CELT only: the lowest delay Opus has, and the only mode that takes 2.5 ms frames. */
export declare const OPUS_RESTRICTED_LOWDELAY = 2051;
export interface OpusCodec {
    encoder(options: {
        frame: number;
        bitrate: number;
        complexity?: number;
        channels?: 1 | 2;
    }): OpusEncoder;
    /** Decodes mono and stereo packets alike; a stereo decoder gives a mono packet on both sides. */
    decoder(frame: number, channels?: 1 | 2): OpusDecoder;
}
export interface OpusEncoder {
    /** One frame of float PCM in, interleaved when stereo, one packet out. */
    encode(pcm: Float32Array): Uint8Array;
    destroy(): void;
}
export interface OpusDecoder {
    /** A packet in, one frame out, interleaved when stereo. Null for a packet that never came: Opus fills the gap. */
    decode(packet: Uint8Array | null): Float32Array;
    destroy(): void;
}
export declare function loadOpus(bytes: BufferSource): Promise<OpusCodec>;