@svta/common-media-library/dist/throughput/ZlemaEstimator.js

A common library for media playback in JavaScript

import { getBandwidthBps } from '../utils/getBandwidthBps.js';
/**
 * Zero-Lag Exponential Moving Average (ZLEMA) throughput estimator
 *
 * @group Throughput
 *
 * @beta
 */
export class ZlemaEstimator {
    constructor() {
        this.samples = [];
    }
    sample(sample) {
        this.samples.push(sample);
    }
    getEstimate() {
        if (this.samples.length === 0) {
            return NaN;
        }
        const alpha = 2 / (this.samples.length + 1);
        let ema, zlema;
        ema = zlema = getBandwidthBps(this.samples[this.samples.length - 1]);
        for (let i = 0; i < this.samples.length; i++) {
            ema = alpha * getBandwidthBps(this.samples[i]) + (1 - alpha) * ema;
            zlema = alpha * ema + (1 - alpha) * zlema;
        }
        return zlema;
    }
}
//# sourceMappingURL=ZlemaEstimator.js.map