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A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
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<h1 class="page-title">Source: streaming/protection/models/ProtectionModel_3Feb2014.js</h1>
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<pre
class="sunlight-highlight-javascript linenums">/**
* 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.
*/
/**
* Implementation of the EME APIs as of the 3 Feb 2014 state of the specification.
*
* Implemented by Internet Explorer 11 (Windows 8.1)
*
* @implements ProtectionModel
* @class
*/
import ProtectionKeyController from '../controllers/ProtectionKeyController';
import NeedKey from '../vo/NeedKey';
import DashJSError from '../../vo/DashJSError';
import ProtectionErrors from '../errors/ProtectionErrors';
import KeyMessage from '../vo/KeyMessage';
import KeySystemConfiguration from '../vo/KeySystemConfiguration';
import KeySystemAccess from '../vo/KeySystemAccess';
function ProtectionModel_3Feb2014(config) {
config = config || {};
const context = this.context;
const eventBus = config.eventBus;//Need to pass in here so we can use same instance since this is optional module
const events = config.events;
const debug = config.debug;
const api = config.api;
let instance,
logger,
videoElement,
keySystem,
mediaKeys,
keySystemAccess,
sessions,
eventHandler,
protectionKeyController;
function setup() {
logger = debug.getLogger(instance);
videoElement = null;
keySystem = null;
mediaKeys = null;
keySystemAccess = null;
sessions = [];
protectionKeyController = ProtectionKeyController(context).getInstance();
eventHandler = createEventHandler();
}
function reset() {
try {
for (let i = 0; i < sessions.length; i++) {
closeKeySession(sessions[i]);
}
if (videoElement) {
videoElement.removeEventListener(api.needkey, eventHandler);
}
eventBus.trigger(events.TEARDOWN_COMPLETE);
} catch (error) {
eventBus.trigger(events.TEARDOWN_COMPLETE, { error: 'Error tearing down key sessions and MediaKeys! -- ' + error.message });
}
}
function getAllInitData() {
const retVal = [];
for (let i = 0; i < sessions.length; i++) {
retVal.push(sessions[i].initData);
}
return retVal;
}
function getSessions() {
return sessions;
}
function requestKeySystemAccess(ksConfigurations) {
return new Promise((resolve, reject) => {
// Try key systems in order, first one with supported key system configuration
// is used
let found = false;
for (let ksIdx = 0; ksIdx < ksConfigurations.length; ksIdx++) {
const systemString = ksConfigurations[ksIdx].ks.systemString;
const configs = ksConfigurations[ksIdx].configs;
let supportedAudio = null;
let supportedVideo = null;
// Try key system configs in order, first one with supported audio/video
// is used
for (let configIdx = 0; configIdx < configs.length; configIdx++) {
const audios = configs[configIdx].audioCapabilities;
const videos = configs[configIdx].videoCapabilities;
// Look for supported audio container/codecs
if (audios && audios.length !== 0) {
supportedAudio = []; // Indicates that we have a requested audio config
for (let audioIdx = 0; audioIdx < audios.length; audioIdx++) {
if (window[api.MediaKeys].isTypeSupported(systemString, audios[audioIdx].contentType)) {
supportedAudio.push(audios[audioIdx]);
}
}
}
// Look for supported video container/codecs
if (videos && videos.length !== 0) {
supportedVideo = []; // Indicates that we have a requested video config
for (let videoIdx = 0; videoIdx < videos.length; videoIdx++) {
if (window[api.MediaKeys].isTypeSupported(systemString, videos[videoIdx].contentType)) {
supportedVideo.push(videos[videoIdx]);
}
}
}
// No supported audio or video in this configuration OR we have
// requested audio or video configuration that is not supported
if ((!supportedAudio && !supportedVideo) ||
(supportedAudio && supportedAudio.length === 0) ||
(supportedVideo && supportedVideo.length === 0)) {
continue;
}
// This configuration is supported
found = true;
const ksConfig = new KeySystemConfiguration(supportedAudio, supportedVideo);
const ks = protectionKeyController.getKeySystemBySystemString(systemString);
const keySystemAccess = new KeySystemAccess(ks, ksConfig);
eventBus.trigger(events.KEY_SYSTEM_ACCESS_COMPLETE, { data: keySystemAccess });
resolve({ data: keySystemAccess });
break;
}
}
if (!found) {
const errorMessage = 'Key system access denied! -- No valid audio/video content configurations detected!';
eventBus.trigger(events.KEY_SYSTEM_ACCESS_COMPLETE, { error: errorMessage });
reject({ error: errorMessage });
}
})
}
function selectKeySystem(ksAccess) {
return new Promise((resolve, reject) => {
try {
mediaKeys = ksAccess.mediaKeys = new window[api.MediaKeys](ksAccess.keySystem.systemString);
keySystem = ksAccess.keySystem;
keySystemAccess = ksAccess;
if (videoElement) {
setMediaKeys();
}
resolve(keySystem);
} catch (error) {
reject({ error: 'Error selecting keys system (' + keySystem.systemString + ')! Could not create MediaKeys -- TODO' });
}
})
}
function setMediaElement(mediaElement) {
if (videoElement === mediaElement)
return;
// Replacing the previous element
if (videoElement) {
videoElement.removeEventListener(api.needkey, eventHandler);
}
videoElement = mediaElement;
// Only if we are not detaching from the existing element
if (videoElement) {
videoElement.addEventListener(api.needkey, eventHandler);
if (mediaKeys) {
setMediaKeys();
}
}
}
function createKeySession(ksInfo) {
if (!keySystem || !mediaKeys || !keySystemAccess) {
throw new Error('Can not create sessions until you have selected a key system');
}
// Use the first video capability for the contentType.
// TODO: Not sure if there is a way to concatenate all capability data into a RFC6386-compatible format
// If player is trying to playback Audio only stream - don't error out.
let capabilities = null;
if (keySystemAccess.ksConfiguration.videoCapabilities && keySystemAccess.ksConfiguration.videoCapabilities.length > 0) {
capabilities = keySystemAccess.ksConfiguration.videoCapabilities[0];
}
if (capabilities === null && keySystemAccess.ksConfiguration.audioCapabilities && keySystemAccess.ksConfiguration.audioCapabilities.length > 0) {
capabilities = keySystemAccess.ksConfiguration.audioCapabilities[0];
}
if (capabilities === null) {
throw new Error('Can not create sessions for unknown content types.');
}
const contentType = capabilities.contentType;
const session = mediaKeys.createSession(contentType, new Uint8Array(ksInfo.initData), ksInfo.cdmData ? new Uint8Array(ksInfo.cdmData) : null);
const sessionToken = createSessionToken(session, ksInfo);
// Add all event listeners
session.addEventListener(api.error, sessionToken);
session.addEventListener(api.message, sessionToken);
session.addEventListener(api.ready, sessionToken);
session.addEventListener(api.close, sessionToken);
// Add to our session list
sessions.push(sessionToken);
logger.debug('DRM: Session created. SessionID = ' + sessionToken.getSessionId());
eventBus.trigger(events.KEY_SESSION_CREATED, { data: sessionToken });
}
function updateKeySession(sessionToken, message) {
const session = sessionToken.session;
if (!protectionKeyController.isClearKey(keySystem)) {
// Send our request to the key session
session.update(new Uint8Array(message));
} else {
// For clearkey, message is a ClearKeyKeySet
session.update(new Uint8Array(message.toJWK()));
}
eventBus.trigger(events.KEY_SESSION_UPDATED);
}
/**
* Close the given session and release all associated keys. Following
* this call, the sessionToken becomes invalid
*
* @param {Object} sessionToken - the session token
*/
function closeKeySession(sessionToken) {
const session = sessionToken.session;
// Remove event listeners
session.removeEventListener(api.error, sessionToken);
session.removeEventListener(api.message, sessionToken);
session.removeEventListener(api.ready, sessionToken);
session.removeEventListener(api.close, sessionToken);
// Remove from our session list
for (let i = 0; i < sessions.length; i++) {
if (sessions[i] === sessionToken) {
sessions.splice(i, 1);
break;
}
}
// Send our request to the key session
session[api.release]();
}
function setServerCertificate(/*serverCertificate*/) { /* Not supported */
}
function loadKeySession(/*ksInfo*/) { /* Not supported */
}
function removeKeySession(/*sessionToken*/) { /* Not supported */
}
function createEventHandler() {
return {
handleEvent: function (event) {
switch (event.type) {
case api.needkey:
if (event.initData) {
const initData = ArrayBuffer.isView(event.initData) ? event.initData.buffer : event.initData;
eventBus.trigger(events.NEED_KEY, { key: new NeedKey(initData, 'cenc') });
}
break;
}
}
};
}
// IE11 does not let you set MediaKeys until it has entered a certain
// readyState, so we need this logic to ensure we don't set the keys
// too early
function setMediaKeys() {
let boundDoSetKeys = null;
const doSetKeys = function () {
videoElement.removeEventListener('loadedmetadata', boundDoSetKeys);
videoElement[api.setMediaKeys](mediaKeys);
eventBus.trigger(events.VIDEO_ELEMENT_SELECTED);
};
if (videoElement.readyState >= 1) {
doSetKeys();
} else {
boundDoSetKeys = doSetKeys.bind(this);
videoElement.addEventListener('loadedmetadata', boundDoSetKeys);
}
}
// Function to create our session token objects which manage the EME
// MediaKeySession and session-specific event handler
function createSessionToken(keySession, ksInfo) {
return {
// Implements SessionToken
session: keySession,
keyId: ksInfo.keyId,
initData: ksInfo.initData,
getKeyId: function () {
return this.keyId;
},
getSessionId: function () {
return this.session.sessionId;
},
getExpirationTime: function () {
return NaN;
},
getSessionType: function () {
return 'temporary';
},
// This is our main event handler for all desired MediaKeySession events
// These events are translated into our API-independent versions of the
// same events
handleEvent: function (event) {
switch (event.type) {
case api.error:
let errorStr = 'KeyError'; // TODO: Make better string from event
eventBus.trigger(events.KEY_ERROR, { error: new DashJSError(ProtectionErrors.MEDIA_KEYERR_CODE, errorStr, this) });
break;
case api.message:
let message = ArrayBuffer.isView(event.message) ? event.message.buffer : event.message;
eventBus.trigger(events.INTERNAL_KEY_MESSAGE, { data: new KeyMessage(this, message, event.destinationURL) });
break;
case api.ready:
logger.debug('DRM: Key added.');
eventBus.trigger(events.KEY_ADDED);
break;
case api.close:
logger.debug('DRM: Session closed. SessionID = ' + this.getSessionId());
eventBus.trigger(events.KEY_SESSION_CLOSED, { data: this.getSessionId() });
break;
}
}
};
}
instance = {
getAllInitData,
getSessions,
requestKeySystemAccess,
selectKeySystem,
setMediaElement,
createKeySession,
updateKeySession,
closeKeySession,
setServerCertificate,
loadKeySession,
removeKeySession,
stop: reset,
reset
};
setup();
return instance;
}
ProtectionModel_3Feb2014.__dashjs_factory_name = 'ProtectionModel_3Feb2014';
export default dashjs.FactoryMaker.getClassFactory(ProtectionModel_3Feb2014); /* jshint ignore:line */
</pre>
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<h3>DASH Industry Forum</h3>
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