/** 16 kHz wideband PCM sample rate for G.722. */
export declare const G722_SAMPLE_RATE_HZ = 16000;
/** 64 kbit/s = 1 byte per pair of 16 kHz samples. */
export declare const G722_BITRATE = 64000;
interface BandState {
    nb: number;
    det: number;
    s: number;
    sz: number;
    r: number;
    p: [number, number];
    a: [number, number];
    b: [number, number, number, number, number, number];
    d: [number, number, number, number, number, number, number];
}
export interface G722EncoderState {
    readonly _kind: "g722-encoder";
    ptr: number;
    x: Int16Array;
    y: Int16Array;
    band: [BandState, BandState];
    /** leftover sample when input length is odd */
    pending: number | null;
}
export interface G722DecoderState {
    readonly _kind: "g722-decoder";
    ptr: number;
    x: Int16Array;
    y: Int16Array;
    band: [BandState, BandState];
}
export declare function createG722EncoderState(): G722EncoderState;
export declare function createG722DecoderState(): G722DecoderState;
/** Encode 16 kHz PCM16 → G.722 64 kbit/s bytes. Mutates `state`. Odd trailing sample is held for next call. */
export declare function encodeG722(state: G722EncoderState, pcm16: Int16Array): Uint8Array;
/** Decode G.722 64 kbit/s bytes → 16 kHz PCM16. Mutates `state`. */
export declare function decodeG722(state: G722DecoderState, g722: Uint8Array): Int16Array;
export {};
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