import type { AudioFormat } from "./packets.js";
export declare const SYRINX_AUDIO_ENVELOPE_NAME: "syrinx.audio.v1";
export declare const SYRINX_AUDIO_ENVELOPE_MAGIC: Uint8Array<ArrayBuffer>;
export interface SyrinxAudioEnvelopeHeader {
    readonly type: "audio";
    readonly contextId?: string;
    readonly sampleRateHz: number;
    readonly sequence?: number;
    readonly encoding?: "pcm_s16le" | "opus";
    readonly channels?: 1;
    readonly byteLength?: number;
    readonly durationMs?: number;
}
export interface SyrinxAudioEnvelope {
    readonly header: SyrinxAudioEnvelopeHeader;
    readonly audio: Uint8Array;
}
export declare function assertAudioFormat(format: AudioFormat): void;
export declare function assertAudioPayload(format: AudioFormat, audio: Uint8Array): void;
export declare function encodeSyrinxAudioEnvelope(header: SyrinxAudioEnvelopeHeader, audio: Uint8Array): Uint8Array;
export declare function decodeSyrinxAudioEnvelope(data: Uint8Array): SyrinxAudioEnvelope;
export declare function hasSyrinxAudioEnvelope(data: Uint8Array): boolean;
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