/**
 * SimulationPlayback — State machine for replaying recorded simulation snapshots.
 *
 * States: idle → recording → paused → playing ↔ paused
 *
 * During playback, interpolates between bracketing snapshots for smooth
 * scrubbing at arbitrary speeds (including reverse).
 *
 * @see SimulationRecorder — produces the snapshot history this consumes
 */
import { SimulationRecorder } from './SimulationRecorder';
export type PlaybackState = 'idle' | 'recording' | 'paused' | 'playing';
export interface PlaybackConfig {
    /** Playback speed multiplier (default: 1.0). Negative = reverse. */
    playbackSpeed?: number;
    /** Enable linear interpolation between snapshots (default: true) */
    interpolation?: boolean;
    /** Loop playback when reaching the end (default: false) */
    loop?: boolean;
}
export declare class SimulationPlayback {
    private state;
    private currentTime;
    private speed;
    private interpolate;
    private loop;
    private recorder;
    private scratchBuffers;
    constructor(recorder: SimulationRecorder, config?: PlaybackConfig);
    startRecording(): void;
    stopRecording(): void;
    play(): void;
    pause(): void;
    stop(): void;
    seekTo(time: number): void;
    seekToFrame(index: number): void;
    seekToProgress(progress: number): void;
    stepForward(): void;
    stepBackward(): void;
    /**
     * Advance playback by wall-clock delta seconds.
     * Returns interpolated field data, or null if not in playback mode.
     */
    tick(wallDelta: number): Map<string, Float32Array> | null;
    /**
     * Get interpolated fields at the current playback time.
     * Can be called from paused state for scrubber preview.
     */
    getFieldsAtCurrentTime(): Map<string, Float32Array> | null;
    getState(): PlaybackState;
    getCurrentTime(): number;
    getSpeed(): number;
    getCurrentFrame(): number;
    getTotalFrames(): number;
    getTimeRange(): [number, number];
    getProgress(): number;
    getMemoryUsage(): number;
    setSpeed(speed: number): void;
    setLoop(loop: boolean): void;
    private interpolateFields;
}
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