import { PeerType, TrackType } from '../../gen/video/sfu/models/models';
import type { ComputedStats } from './types';
/**
 * StatsTracer is a class that collects and processes WebRTC stats.
 * It is used to track the performance of the WebRTC connection
 * and to provide information about the media streams.
 * It is used by both the Publisher and Subscriber classes.
 *
 * @internal
 */
export declare class StatsTracer {
    private readonly pc;
    private readonly peerType;
    private readonly trackIdToTrackType;
    private readonly driftThresholdMs;
    private costOverrides?;
    private previousStats;
    private frameTimeHistory;
    private fpsHistory;
    /**
     * Creates a new StatsTracer instance.
     */
    constructor(pc: RTCPeerConnection, peerType: PeerType, trackIdToTrackType: Map<string, TrackType>, statsTimestampDriftThresholdMs?: number);
    /**
     * Get the stats from the RTCPeerConnection.
     * When called, it will return the stats for the current connection.
     * It will also return the delta between the current stats and the previous stats.
     * This is used to track the performance of the connection.
     *
     * @internal
     */
    get: () => Promise<ComputedStats>;
    /**
     * Collects encode stats from the RTCPeerConnection.
     */
    private getEncodeStats;
    /**
     * Collects decode stats from the RTCPeerConnection.
     */
    private getDecodeStats;
    /**
     * Applies cost overrides to the performance stats.
     * This is used to override the default encode/decode times with custom values.
     * This is useful for testing and debugging purposes, and it shouldn't be used in production.
     */
    private withOverrides;
    /**
     * Set the encode/decode cost for a specific track type.
     * This is used to override the default encode/decode times with custom values.
     * This is useful for testing and debugging purposes, and it shouldn't be used in production.
     *
     * @internal
     */
    setCost: (cost: number, trackType?: TrackType) => void;
}