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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'; import {THUMBNAILS_SCHEME_ID_URIS} from '../thumbnail/ThumbnailTracks'; import Constants from '../constants/Constants'; const codecCompatibilityTable = [ { 'codec': 'avc1', 'compatibleCodecs': ['avc3'] }, { 'codec': 'avc3', 'compatibleCodecs': ['avc1'] } ]; export function supportsMediaSource() { let hasManagedMediaSource = ('ManagedMediaSource' in window) let hasWebKit = ('WebKitMediaSource' in window); let hasMediaSource = ('MediaSource' in window); return (hasManagedMediaSource || hasWebKit || hasMediaSource); } function Capabilities() { let instance, settings, encryptedMediaSupported; function setup() { encryptedMediaSupported = false; } function setConfig(config) { if (!config) { return; } if (config.settings) { settings = config.settings; } } /** * Returns whether Encrypted Media Extensions are supported on this * user agent * * @return {boolean} true if EME is supported, false otherwise */ function supportsEncryptedMedia() { return encryptedMediaSupported; } /** * * @param {boolean} value */ function setEncryptedMediaSupported(value) { encryptedMediaSupported = value; } /** * Check if a codec is supported by the MediaSource. We use the MediaCapabilities API or the MSE to check. * @param {object} config * @param {string} type * @return {Promise<boolean>} */ function supportsCodec(config, type) { if (type !== Constants.AUDIO && type !== Constants.VIDEO) { return Promise.resolve(true); } if (_canUseMediaCapabilitiesApi(config, type)) { return _checkCodecWithMediaCapabilities(config, type); } return _checkCodecWithMse(config); } /** * MediaCapabilitiesAPI throws an error if one of the attribute is missing. We only use it if we have all required information. * @param {object} config * @param {string} type * @return {*|boolean|boolean} * @private */ function _canUseMediaCapabilitiesApi(config, type) { return settings.get().streaming.capabilities.useMediaCapabilitiesApi && navigator.mediaCapabilities && navigator.mediaCapabilities.decodingInfo && ((config.codec && type === Constants.AUDIO) || (type === Constants.VIDEO && config.codec && config.width && config.height && config.bitrate && config.framerate)); } /** * Check codec support using the MSE * @param {object} config * @return {Promise<void> | Promise<boolean>} * @private */ function _checkCodecWithMse(config) { return new Promise((resolve) => { if (!config || !config.codec) { resolve(false); return; } let codec = config.codec; if (config.width && config.height) { codec += ';width="' + config.width + '";height="' + config.height + '"'; } // eslint-disable-next-line no-undef if ('ManagedMediaSource' in window && ManagedMediaSource.isTypeSupported(codec)) { resolve(true); return; } else if ('MediaSource' in window && MediaSource.isTypeSupported(codec)) { resolve(true); return; } else if ('WebKitMediaSource' in window && WebKitMediaSource.isTypeSupported(codec)) { resolve(true); return; } resolve(false); }); } /** * Check codec support using the MediaCapabilities API * @param {object} config * @param {string} type * @return {Promise<boolean>} * @private */ function _checkCodecWithMediaCapabilities(config, type) { return new Promise((resolve) => { if (!config || !config.codec) { resolve(false); return; } const configuration = { type: 'media-source' }; configuration[type] = {}; configuration[type].contentType = config.codec; configuration[type].width = config.width; configuration[type].height = config.height; configuration[type].bitrate = parseInt(config.bitrate); configuration[type].framerate = parseFloat(config.framerate); navigator.mediaCapabilities.decodingInfo(configuration) .then((result) => { resolve(result.supported); }) .catch(() => { resolve(false); }); }); } /** * Check if a specific EssentialProperty is supported * @param {object} ep * @return {boolean} */ function supportsEssentialProperty(ep) { try { return (THUMBNAILS_SCHEME_ID_URIS.indexOf(ep.schemeIdUri) !== -1) || (Constants.FONT_DOWNLOAD_DVB_SCHEME === ep.schemeIdUri); } catch (e) { return true; } } /** * Check if the root of the old codec is the same as the new one, or if it's declared as compatible in the compat table * @param {string} codec1 * @param {string} codec2 * @return {boolean} */ function codecRootCompatibleWithCodec(codec1, codec2) { const codecRoot = codec1.split('.')[0]; const rootCompatible = codec2.indexOf(codecRoot) === 0; let compatTableCodec; for (let i = 0; i < codecCompatibilityTable.length; i++) { if (codecCompatibilityTable[i].codec === codecRoot) { compatTableCodec = codecCompatibilityTable[i]; break; } } if (compatTableCodec) { return rootCompatible || compatTableCodec.compatibleCodecs.some((compatibleCodec) => codec2.indexOf(compatibleCodec) === 0); } return rootCompatible; } instance = { setConfig, supportsMediaSource, supportsEncryptedMedia, supportsCodec, setEncryptedMediaSupported, supportsEssentialProperty, codecRootCompatibleWithCodec }; setup(); return instance; } Capabilities.__dashjs_factory_name = 'Capabilities'; export default FactoryMaker.getSingletonFactory(Capabilities); </code></pre></article></section></div></div></div><div class="search-container" id="PkfLWpAbet" style="display:none"><div class="wrapper" id="iCxFxjkHbP"><button class="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><use xlink:href="#close-icon"></use></svg></button><div class="search-box-c"><svg><use xlink:href="#search-icon"></use></svg> <input type="text" id="vpcKVYIppa" class="search-input" placeholder="Search..." autofocus></div><div class="search-result-c" id="fWwVHRuDuN"><span class="search-result-c-text">Type 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