import { MessageType } from "../protocol/message_type";
import { CustomPlayerSpec } from "./interface";
export declare enum RequestType {
    CHECK_BACKEND = "check",
    PREPARE = "prepare",
    STOP = "stop",
    PAUSE = "pause",
    RESUME = "resume",
    PLAY_URLS = "play-urls",
    SET_VOLUME = "set-volume",
    ADJUST_VOLUME = "adj-volume",
    SET_MUTE = "set-mute",
    SET_VOICE_INPUT = "set-voice-input",
    SET_VOICE_OUTPUT = "set-voice-output"
}
export interface CheckBackendRequestMessage {
    type: MessageType.AUDIO_SUBPROTOCOL;
    op: RequestType.CHECK_BACKEND;
    /**
     * Serial number of the request
     */
    req: number;
    spec: CustomPlayerSpec;
}
export interface PrepareRequestMessage {
    type: MessageType.AUDIO_SUBPROTOCOL;
    op: RequestType.PREPARE;
    req: number;
    spec?: CustomPlayerSpec;
}
export interface StopRequestMessage {
    type: MessageType.AUDIO_SUBPROTOCOL;
    op: RequestType.STOP;
    req: number;
}
export interface PauseRequestMessage {
    type: MessageType.AUDIO_SUBPROTOCOL;
    op: RequestType.PAUSE;
    req: number;
}
export interface ResumeRequestMessage {
    type: MessageType.AUDIO_SUBPROTOCOL;
    op: RequestType.RESUME;
    req: number;
}
export interface PlayURLMessage {
    type: MessageType.AUDIO_SUBPROTOCOL;
    op: RequestType.PLAY_URLS;
    req: number;
    urls: string[];
}
export interface SetVolumeMessage {
    type: MessageType.AUDIO_SUBPROTOCOL;
    op: RequestType.SET_VOLUME;
    req: number;
    volume: number;
}
export interface AdjustVolumeMessage {
    type: MessageType.AUDIO_SUBPROTOCOL;
    op: RequestType.ADJUST_VOLUME;
    req: number;
    delta: number;
}
export interface SetMuteMessage {
    type: MessageType.AUDIO_SUBPROTOCOL;
    op: RequestType.SET_MUTE;
    req: number;
    mute: boolean;
}
export interface SetVoiceInputMessage {
    type: MessageType.AUDIO_SUBPROTOCOL;
    op: RequestType.SET_VOICE_INPUT;
    req: number;
    input: boolean;
}
export interface SetVoiceOutputMessage {
    type: MessageType.AUDIO_SUBPROTOCOL;
    op: RequestType.SET_VOICE_OUTPUT;
    req: number;
    output: boolean;
}
export declare type ServerMessage = CheckBackendRequestMessage | PrepareRequestMessage | StopRequestMessage | PauseRequestMessage | ResumeRequestMessage | PlayURLMessage | SetVolumeMessage | AdjustVolumeMessage | SetMuteMessage | SetVoiceInputMessage | SetVoiceOutputMessage;
/**
 * The result of a "check backend" operation.
 */
export interface CheckBackendResponseMessage {
    type: MessageType.AUDIO_SUBPROTOCOL;
    req: number;
    /**
     * Whether the backend was available and initialized successfully.
     */
    ok: boolean;
    /**
     * Detailed string of why the backend was not available, for logging.
     */
    detail?: string;
    /**
     * Error associated with this operation, if any.
     *
     * This is only relevant for protocol errors, not errors related to
     * the initialization of the backend.
     */
    error?: {
        /**
         * Human readable error message.
         *
         * The purpose of this error message is for logging and developer
         * use, not to be displayed directly to users.
         */
        message: string;
        /**
         * Error code, if available.
         */
        code?: string;
    };
}
/**
 * The result of any other server-initiated operation.
 *
 * The operation was considered successful if the {@link error}
 * field is not present.
 */
export interface GenericResponseMessage {
    type: MessageType.AUDIO_SUBPROTOCOL;
    req: number;
    /**
     * Error associated with this operation, if any.
     */
    error?: {
        /**
         * Human readable error message.
         *
         * The purpose of this error message is for logging and developer
         * use, not to be displayed directly to users.
         */
        message: string;
        /**
         * Error code, if available.
         */
        code?: string;
    };
}
export declare type ClientMessage = CheckBackendResponseMessage | GenericResponseMessage;