@l5i/dashjs/src/streaming/utils/Capabilities.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 FactoryMaker from '../../core/FactoryMaker';

function Capabilities() {

    let instance,
        encryptedMediaSupported;

    function setup() {
        encryptedMediaSupported = false;
    }

    function supportsMediaSource() {
        let hasWebKit = ('WebKitMediaSource' in window);
        let hasMediaSource = ('MediaSource' in window);

        return (hasWebKit || hasMediaSource);
    }

    /**
     * Returns whether Encrypted Media Extensions are supported on this
     * user agent
     *
     * @return {boolean} true if EME is supported, false otherwise
     */
    function supportsEncryptedMedia() {
        return encryptedMediaSupported;
    }

    function setEncryptedMediaSupported(value) {
        encryptedMediaSupported = value;
    }

    function supportsCodec(codec) {
        if ('MediaSource' in window && MediaSource.isTypeSupported(codec)) {
            return true;
        }

        if ('WebKitMediaSource' in window && WebKitMediaSource.isTypeSupported(codec)) {
            return true;
        }

        return false;
    }

    instance = {
        supportsMediaSource: supportsMediaSource,
        supportsEncryptedMedia: supportsEncryptedMedia,
        supportsCodec: supportsCodec,
        setEncryptedMediaSupported: setEncryptedMediaSupported
    };

    setup();

    return instance;
}
Capabilities.__dashjs_factory_name = 'Capabilities';
export default FactoryMaker.getSingletonFactory(Capabilities);