import { Observable } from 'rxjs';
import { MixerConnection } from '../mixer-connection';
import { MixerStore } from '../state/mixer-store';
import { Easings } from '../utils/transitions/easings';
import { FadeableChannel, PannableChannel, PostProcessableChannel } from './interfaces';
/**
 * Base class for all sources routed to a matrix bus.
 * A matrix source can be an AUX bus or subgroup (`MtxBusChannel`) or the
 * master mix (`MtxMasterChannel`). Matrix buses are only available on the Ui24R.
 *
 * The level, MUTE and PAN observables are derived purely from the `fullChannelId`,
 * because the matrix state always lives at `<fullChannelId>.value/.mute/.pan`.
 * The concrete subclass only has to provide the `fullChannelId` and override `name$`,
 * which is the one source that can't be derived from the id (the master source has no
 * channel index and therefore no name path).
 */
export declare abstract class MtxChannel implements FadeableChannel, PannableChannel, PostProcessableChannel {
    protected conn: MixerConnection;
    protected store: MixerStore;
    protected fullChannelId: string;
    /** Name of the matrix source (provided by the concrete subclass) */
    abstract readonly name$: Observable<string>;
    /** Linear level of the matrix source (between `0` and `1`) */
    readonly faderLevel$: Observable<number>;
    /** dB level of the matrix source (between `-Infinity` and `10`) */
    readonly faderLevelDB$: Observable<number>;
    /** MUTE state of the matrix source */
    readonly mute$: Observable<boolean>;
    /** PAN value of the matrix source (between `0` and `1`) */
    readonly pan$: Observable<number>;
    /** PRE/POST PROC state of the matrix source (`false` for PRE PROC, `true` for POST PROC) */
    readonly postProc$: Observable<boolean>;
    /** all linked channels (mirror on the stereo-linked matrix output and stereo-link neighbour) */
    protected linkedChannelIds: string[];
    /** channels that mirror the PAN value (the stereo-linked matrix output, but not a neighbour source) */
    protected panLinkChannelIds: string[];
    private transitionSources$;
    constructor(conn: MixerConnection, store: MixerStore, fullChannelId: string);
    /**
     * Perform fader transition to linear value
     * @param targetValue Target value as linear value (between 0 and 1)
     * @param fadeTime Fade time in ms
     * @param easing Easing characteristic, as an entry of the `Easings` enum. Defaults to `Linear`
     * @param fps Frames per second, defaults to 25
     */
    fadeTo(targetValue: number, fadeTime: number, easing?: Easings, fps?: number): Promise<void>;
    /**
     * Perform fader transition to dB value
     * @param targetValueDB Target value as dB value (between -Infinity and 10)
     * @param fadeTime Fade time in ms
     * @param easing Easing characteristic, as an entry of the `Easings` enum. Defaults to `Linear`
     * @param fps Frames per second, defaults to 25
     */
    fadeToDB(targetValueDB: number, fadeTime: number, easing?: Easings, fps?: number): Promise<void>;
    /**
     * Set linear level of the matrix source
     * @param value value between `0` and `1`
     */
    setFaderLevel(value: number): void;
    private setFaderLevelRaw;
    /**
     * Set dB level of the matrix source
     * @param value value between `-Infinity` and `10`
     */
    setFaderLevelDB(dbValue: number): void;
    /**
     * Change the fader value relatively by adding a given linear value
     * @param offset value to add to the current linear fader value
     */
    changeFaderLevel(offset: number): void;
    /**
     * Change the fader value relatively by adding a given value
     * @param offsetDB value (dB) to add to the current value
     */
    changeFaderLevelDB(offsetDB: number): void;
    /**
     * Set MUTE state for the matrix source
     * @param value MUTE state
     */
    setMute(value: boolean): void;
    /** Enable MUTE for the matrix source */
    mute(): void;
    /** Disable MUTE for the matrix source */
    unmute(): void;
    /** Toggle MUTE state for the matrix source */
    toggleMute(): void;
    /**
     * Set PAN value of the matrix source.
     * This only works for stereo-linked matrix buses, not for mono matrix.
     * @param value value between `0` and `1`
     */
    setPan(value: number): void;
    /**
     * Relatively change PAN value of the matrix source.
     * This only works for stereo-linked matrix buses, not for mono matrix.
     * @param offset offset to change (final values are between `0` and `1`)
     */
    changePan(offset: number): void;
    /**
     * Set PRE/POST PROC state for the matrix source
     * @param value POST PROC (`true`) or PRE PROC (`false`)
     */
    setPostProc(value: boolean): void;
    /** Set matrix source to POST PROC */
    postProc(): void;
    /** Set matrix source to PRE PROC */
    preProc(): void;
}