/** The own transport's datagram (GRYT-1818): version u8, flags u8, seq u16, timestamp u32 (48 kHz
    samples), then one Opus packet. The SFU prefixes the sender id from the session, never the packet. */
export declare const PACKET_VERSION = 1;
export declare const HEADER_BYTES = 8;
/** Opus's own maximum; anything longer is dropped unread. */
export declare const MAX_OPUS_BYTES = 1275;
/** The SFU's prefix on a forwarded packet: the sender's u32 id. */
export declare const SENDER_BYTES = 4;
export declare const FLAG_SPEAKING = 1;
/** The payload is a round-trip probe (probe.ts), not Opus (GRYT-1836). */
export declare const FLAG_PROBE = 2;
export interface AudioPacket {
    flags: number;
    seq: number;
    timestamp: number;
    opus: Uint8Array;
}
export declare function writePacket(p: AudioPacket): Uint8Array;
/** Null for anything that isn't a packet this version wrote: wrong version, too short, too long. */
export declare function readPacket(bytes: Uint8Array): AudioPacket | null;
/** A forwarded packet: the SFU's sender id, then the packet as the sender wrote it. */
export declare function readForwarded(bytes: Uint8Array): {
    sender: number;
    packet: AudioPacket;
} | null;
/** How far `b` is past `a` in a wrapping u16 sequence, -32768..32767. */
export declare function seqDelta(a: number, b: number): number;