import type { Pcm } from '../../services/voice/audio.js';
export declare const DEFAULT_REALTIME_VOICE_SAMPLE_RATE = 24000;
export declare const DEFAULT_REALTIME_VOICE_CHANNELS = 1;
export declare const DEFAULT_REALTIME_VOICE_FRAME_MS = 100;
export declare const REALTIME_VOICE_ENCODING = "pcm_s16le";
export type RealtimeVoiceEncoding = typeof REALTIME_VOICE_ENCODING;
export interface RealtimeVoiceAudioFormat {
    encoding: RealtimeVoiceEncoding;
    sampleRate: number;
    channels: number;
    frameMs: number;
}
export interface RealtimeVoiceFrame {
    seq: number;
    offsetMs: number;
    durationMs: number;
    data: Buffer;
    format: RealtimeVoiceAudioFormat;
}
export interface RealtimeVoiceFrameBatch {
    pcm: Pcm;
    format: RealtimeVoiceAudioFormat;
    frames: RealtimeVoiceFrame[];
    durationMs: number;
}
export interface RealtimeVoiceSessionInfo {
    larkAppId: string;
    meetingId: string;
    meetingNo?: string;
}
export type RealtimeVoiceSessionStatus = 'idle' | 'starting' | 'started' | 'stopping' | 'stopped' | 'failed';
export interface RealtimeVoiceProtocol {
    readonly configured: boolean;
    encodeSessionCreate(format: RealtimeVoiceAudioFormat): Buffer;
    encodeAudioFrame(frame: RealtimeVoiceFrame, sessionId: bigint): Buffer;
    encodeAudioUpstreamClear?(sessionId: bigint): Buffer;
    encodeSessionClose?(sessionId: bigint): Buffer;
    decodeServerEvent(data: Buffer): DecodedRealtimeServerEvent | undefined;
}
export type DecodedRealtimeServerEvent = {
    type: 'session.created';
    eventId?: string;
    sessionId?: bigint;
    createdAt?: string;
    clientEventId?: string;
} | {
    type: 'audio.downstream.delta';
    eventId?: string;
    sessionId?: bigint;
    createdAt?: string;
    trackId?: string;
    source?: string;
    ptsMs?: bigint;
    durationMs?: number;
    delta?: Buffer;
} | {
    type: 'session.closed';
    eventId?: string;
    sessionId?: bigint;
    createdAt?: string;
    reason?: number;
} | {
    type: 'error';
    eventId?: string;
    sessionId?: bigint;
    createdAt?: string;
    clientEventId?: string;
    code?: number;
    message?: string;
    retryable?: boolean;
} | {
    type: 'unknown';
    rawType?: string;
    eventId?: string;
    sessionId?: bigint;
    createdAt?: string;
};
export interface RealtimeVoiceTransport {
    send(data: Buffer): void | Promise<void>;
    receive(): Promise<Buffer | undefined>;
    close?(): void | Promise<void>;
    bufferedAmount?(): number;
}
//# sourceMappingURL=types.d.ts.map