@l5i/dashjs/src/streaming/metrics/controllers/RangeController.js

A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.

/**
 * The copyright in this software is being made available under the BSD License,
 * included below. This software may be subject to other third party and contributor
 * rights, including patent rights, and no such rights are granted under this license.
 *
 * Copyright (c) 2013, Dash Industry Forum.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *  * Redistributions of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation and/or
 *  other materials provided with the distribution.
 *  * Neither the name of Dash Industry Forum nor the names of its
 *  contributors may be used to endorse or promote products derived from this software
 *  without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
 *  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 *  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 *  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */

import CustomTimeRanges from '../../utils/CustomTimeRanges';

function RangeController(config) {

    config = config || {};
    let useWallClockTime = false;
    let context = this.context;
    let instance,
        ranges;

    let mediaElement = config.mediaElement;

    function initialize(rs) {
        if (rs && rs.length) {
            rs.forEach(r => {
                let start = r.starttime;
                let end = start + r.duration;

                ranges.add(start, end);
            });

            useWallClockTime = !!rs[0]._useWallClockTime;
        }
    }

    function reset() {
        ranges.clear();
    }

    function setup() {
        ranges = CustomTimeRanges(context).create();
    }

    function isEnabled() {
        let numRanges = ranges.length;
        let time;

        if (!numRanges) {
            return true;
        }

        // When not present, DASH Metrics reporting is requested
        // for the whole duration of the content.
        time = useWallClockTime ?
                (new Date().getTime() / 1000) :
                mediaElement.currentTime;

        for (let i = 0; i < numRanges; i += 1) {
            let start = ranges.start(i);
            let end = ranges.end(i);

            if ((start <= time) && (time < end)) {
                return true;
            }
        }

        return false;
    }

    instance = {
        initialize: initialize,
        reset:      reset,
        isEnabled:  isEnabled
    };

    setup();

    return instance;
}

RangeController.__dashjs_factory_name = 'RangeController';
export default dashjs.FactoryMaker.getClassFactory(RangeController); /* jshint ignore:line */