/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.media.DrmEngine');
goog.require('goog.asserts');
goog.require('shaka.log');
goog.require('shaka.media.Transmuxer');
goog.require('shaka.net.NetworkingEngine');
goog.require('shaka.util.BufferUtils');
goog.require('shaka.util.Destroyer');
goog.require('shaka.util.Error');
goog.require('shaka.util.EventManager');
goog.require('shaka.util.FakeEvent');
goog.require('shaka.util.IDestroyable');
goog.require('shaka.util.Iterables');
goog.require('shaka.util.Lazy');
goog.require('shaka.util.ManifestParserUtils');
goog.require('shaka.util.MapUtils');
goog.require('shaka.util.MimeUtils');
goog.require('shaka.util.Platform');
goog.require('shaka.util.Pssh');
goog.require('shaka.util.PublicPromise');
goog.require('shaka.util.StreamUtils');
goog.require('shaka.util.StringUtils');
goog.require('shaka.util.Timer');
goog.require('shaka.util.Uint8ArrayUtils');
goog.require('shaka.util.XmlUtils');
/** @implements {shaka.util.IDestroyable} */
shaka.media.DrmEngine = class {
/**
* @param {shaka.media.DrmEngine.PlayerInterface} playerInterface
* @param {number=} updateExpirationTime
*/
constructor(playerInterface, updateExpirationTime = 1) {
/** @private {?shaka.media.DrmEngine.PlayerInterface} */
this.playerInterface_ = playerInterface;
/** @private {!Set.<string>} */
this.supportedTypes_ = new Set();
/** @private {MediaKeys} */
this.mediaKeys_ = null;
/** @private {HTMLMediaElement} */
this.video_ = null;
/** @private {boolean} */
this.initialized_ = false;
/** @private {boolean} */
this.initializedForStorage_ = false;
/** @private {number} */
this.licenseTimeSeconds_ = 0;
/** @private {?shaka.extern.DrmInfo} */
this.currentDrmInfo_ = null;
/** @private {shaka.util.EventManager} */
this.eventManager_ = new shaka.util.EventManager();
/**
* @private {!Map.<MediaKeySession,
* shaka.media.DrmEngine.SessionMetaData>}
*/
this.activeSessions_ = new Map();
/** @private {!Array.<string>} */
this.offlineSessionIds_ = [];
/** @private {!shaka.util.PublicPromise} */
this.allSessionsLoaded_ = new shaka.util.PublicPromise();
/** @private {?shaka.extern.DrmConfiguration} */
this.config_ = null;
/** @private {function(!shaka.util.Error)} */
this.onError_ = (err) => {
this.allSessionsLoaded_.reject(err);
playerInterface.onError(err);
};
/**
* The most recent key status information we have.
* We may not have announced this information to the outside world yet,
* which we delay to batch up changes and avoid spurious "missing key"
* errors.
* @private {!Map.<string, string>}
*/
this.keyStatusByKeyId_ = new Map();
/**
* The key statuses most recently announced to other classes.
* We may have more up-to-date information being collected in
* this.keyStatusByKeyId_, which has not been batched up and released yet.
* @private {!Map.<string, string>}
*/
this.announcedKeyStatusByKeyId_ = new Map();
/** @private {shaka.util.Timer} */
this.keyStatusTimer_ =
new shaka.util.Timer(() => this.processKeyStatusChanges_());
/** @private {boolean} */
this.usePersistentLicenses_ = false;
/** @private {!Array.<!MediaKeyMessageEvent>} */
this.mediaKeyMessageEvents_ = [];
/** @private {boolean} */
this.initialRequestsSent_ = false;
/** @private {?shaka.util.Timer} */
this.expirationTimer_ = new shaka.util.Timer(() => {
this.pollExpiration_();
}).tickEvery(/* seconds= */ updateExpirationTime);
// Add a catch to the Promise to avoid console logs about uncaught errors.
const noop = () => {};
this.allSessionsLoaded_.catch(noop);
/** @const {!shaka.util.Destroyer} */
this.destroyer_ = new shaka.util.Destroyer(() => this.destroyNow_());
/** @private {boolean} */
this.srcEquals_ = false;
/** @private {Promise} */
this.mediaKeysAttached_ = null;
/** @private {?shaka.extern.InitDataOverride} */
this.manifestInitData_ = null;
}
/** @override */
destroy() {
return this.destroyer_.destroy();
}
/**
* Destroy this instance of DrmEngine. This assumes that all other checks
* about "if it should" have passed.
*
* @private
*/
async destroyNow_() {
// |eventManager_| should only be |null| after we call |destroy|. Destroy it
// first so that we will stop responding to events.
this.eventManager_.release();
this.eventManager_ = null;
// Since we are destroying ourselves, we don't want to react to the "all
// sessions loaded" event.
this.allSessionsLoaded_.reject();
// Stop all timers. This will ensure that they do not start any new work
// while we are destroying ourselves.
this.expirationTimer_.stop();
this.expirationTimer_ = null;
this.keyStatusTimer_.stop();
this.keyStatusTimer_ = null;
// Close all open sessions.
await this.closeOpenSessions_();
// |video_| will be |null| if we never attached to a video element.
if (this.video_) {
goog.asserts.assert(!this.video_.src, 'video src must be removed first!');
try {
await this.video_.setMediaKeys(null);
} catch (error) {
// Ignore any failures while removing media keys from the video element.
}
this.video_ = null;
}
// Break references to everything else we hold internally.
this.currentDrmInfo_ = null;
this.supportedTypes_.clear();
this.mediaKeys_ = null;
this.offlineSessionIds_ = [];
this.config_ = null;
this.onError_ = () => {};
this.playerInterface_ = null;
this.srcEquals_ = false;
this.mediaKeysAttached_ = null;
}
/**
* Called by the Player to provide an updated configuration any time it
* changes.
* Must be called at least once before init().
*
* @param {shaka.extern.DrmConfiguration} config
*/
configure(config) {
this.config_ = config;
}
/**
* @param {!boolean} value
*/
setSrcEquals(value) {
this.srcEquals_ = value;
}
/**
* Initialize the drm engine for storing and deleting stored content.
*
* @param {!Array.<shaka.extern.Variant>} variants
* The variants that are going to be stored.
* @param {boolean} usePersistentLicenses
* Whether or not persistent licenses should be requested and stored for
* |manifest|.
* @return {!Promise}
*/
initForStorage(variants, usePersistentLicenses) {
this.initializedForStorage_ = true;
// There are two cases for this call:
// 1. We are about to store a manifest - in that case, there are no offline
// sessions and therefore no offline session ids.
// 2. We are about to remove the offline sessions for this manifest - in
// that case, we don't need to know about them right now either as
// we will be told which ones to remove later.
this.offlineSessionIds_ = [];
// What we really need to know is whether or not they are expecting to use
// persistent licenses.
this.usePersistentLicenses_ = usePersistentLicenses;
return this.init_(variants);
}
/**
* Initialize the drm engine for playback operations.
*
* @param {!Array.<shaka.extern.Variant>} variants
* The variants that we want to support playing.
* @param {!Array.<string>} offlineSessionIds
* @return {!Promise}
*/
initForPlayback(variants, offlineSessionIds) {
this.offlineSessionIds_ = offlineSessionIds;
this.usePersistentLicenses_ = offlineSessionIds.length > 0;
return this.init_(variants);
}
/**
* Initializes the drm engine for removing persistent sessions. Only the
* removeSession(s) methods will work correctly, creating new sessions may not
* work as desired.
*
* @param {string} keySystem
* @param {string} licenseServerUri
* @param {Uint8Array} serverCertificate
* @param {!Array.<MediaKeySystemMediaCapability>} audioCapabilities
* @param {!Array.<MediaKeySystemMediaCapability>} videoCapabilities
* @return {!Promise}
*/
initForRemoval(keySystem, licenseServerUri, serverCertificate,
audioCapabilities, videoCapabilities) {
/** @type {!Map.<string, MediaKeySystemConfiguration>} */
const configsByKeySystem = new Map();
/** @type {MediaKeySystemConfiguration} */
const config = {
audioCapabilities: audioCapabilities,
videoCapabilities: videoCapabilities,
distinctiveIdentifier: 'optional',
persistentState: 'required',
sessionTypes: ['persistent-license'],
label: keySystem, // Tracked by us, ignored by EME.
};
// TODO: refactor, don't stick drmInfos onto MediaKeySystemConfiguration
config['drmInfos'] = [{ // Non-standard attribute, ignored by EME.
keySystem: keySystem,
licenseServerUri: licenseServerUri,
distinctiveIdentifierRequired: false,
persistentStateRequired: true,
audioRobustness: '', // Not required by queryMediaKeys_
videoRobustness: '', // Same
serverCertificate: serverCertificate,
serverCertificateUri: '',
initData: null,
keyIds: null,
}];
configsByKeySystem.set(keySystem, config);
return this.queryMediaKeys_(configsByKeySystem,
/* variants= */ []);
}
/**
* Negotiate for a key system and set up MediaKeys.
* This will assume that both |usePersistentLicences_| and
* |offlineSessionIds_| have been properly set.
*
* @param {!Array.<shaka.extern.Variant>} variants
* The variants that we expect to operate with during the drm engine's
* lifespan of the drm engine.
* @return {!Promise} Resolved if/when a key system has been chosen.
* @private
*/
async init_(variants) {
goog.asserts.assert(this.config_,
'DrmEngine configure() must be called before init()!');
// ClearKey config overrides the manifest DrmInfo if present. The variants
// are modified so that filtering in Player still works.
// This comes before hadDrmInfo because it influences the value of that.
/** @type {?shaka.extern.DrmInfo} */
const clearKeyDrmInfo = this.configureClearKey_();
if (clearKeyDrmInfo) {
for (const variant of variants) {
if (variant.video) {
variant.video.drmInfos = [clearKeyDrmInfo];
}
if (variant.audio) {
variant.audio.drmInfos = [clearKeyDrmInfo];
}
}
}
const hadDrmInfo = variants.some((variant) => {
if (variant.video && variant.video.drmInfos.length) {
return true;
}
if (variant.audio && variant.audio.drmInfos.length) {
return true;
}
return false;
});
// When preparing to play live streams, it is possible that we won't know
// about some upcoming encrypted content. If we initialize the drm engine
// with no key systems, we won't be able to play when the encrypted content
// comes.
//
// To avoid this, we will set the drm engine up to work with as many key
// systems as possible so that we will be ready.
if (!hadDrmInfo) {
const servers = shaka.util.MapUtils.asMap(this.config_.servers);
shaka.media.DrmEngine.replaceDrmInfo_(variants, servers);
}
/** @type {!Set<shaka.extern.DrmInfo>} */
const drmInfos = new Set();
for (const variant of variants) {
const variantDrmInfos = this.getVariantDrmInfos_(variant);
for (const info of variantDrmInfos) {
drmInfos.add(info);
}
}
for (const info of drmInfos) {
shaka.media.DrmEngine.fillInDrmInfoDefaults_(
info,
shaka.util.MapUtils.asMap(this.config_.servers),
shaka.util.MapUtils.asMap(this.config_.advanced || {}),
this.config_.keySystemsMapping);
}
/** @type {!Map.<string, MediaKeySystemConfiguration>} */
let configsByKeySystem;
// We should get the decodingInfo results for the variants after we filling
// in the drm infos, and before queryMediaKeys_().
await shaka.util.StreamUtils.getDecodingInfosForVariants(variants,
this.usePersistentLicenses_, this.srcEquals_);
const hasDrmInfo = hadDrmInfo || Object.keys(this.config_.servers).length;
// An unencrypted content is initialized.
if (!hasDrmInfo) {
this.initialized_ = true;
return Promise.resolve();
}
const p = this.queryMediaKeys_(configsByKeySystem, variants);
// TODO(vaage): Look into the assertion below. If we do not have any drm
// info, we create drm info so that content can play if it has drm info
// later.
// However it is okay if we fail to initialize? If we fail to initialize,
// it means we won't be able to play the later-encrypted content, which is
// not okay.
// If the content did not originally have any drm info, then it doesn't
// matter if we fail to initialize the drm engine, because we won't need it
// anyway.
return hadDrmInfo ? p : p.catch(() => {});
}
/**
* Attach MediaKeys to the video element
* @return {Promise}
* @private
*/
async attachMediaKeys_() {
if (this.video_.mediaKeys) {
return;
}
// An attach process has already started, let's wait it out
if (this.mediaKeysAttached_) {
await this.mediaKeysAttached_;
this.destroyer_.ensureNotDestroyed();
return;
}
try {
this.mediaKeysAttached_ = this.video_.setMediaKeys(this.mediaKeys_);
await this.mediaKeysAttached_;
} catch (exception) {
goog.asserts.assert(exception instanceof Error, 'Wrong error type!');
this.onError_(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.FAILED_TO_ATTACH_TO_VIDEO,
exception.message));
}
this.destroyer_.ensureNotDestroyed();
}
/**
* Processes encrypted event and start licence challenging
* @return {!Promise}
* @private
*/
async onEncryptedEvent_(event) {
/**
* MediaKeys should be added when receiving an encrypted event. Setting
* mediaKeys before could result into encrypted event not being fired on
* some browsers
*/
await this.attachMediaKeys_();
this.newInitData(
event.initDataType,
shaka.util.BufferUtils.toUint8(event.initData));
}
/**
* Start processing events.
* @param {HTMLMediaElement} video
* @return {!Promise}
*/
async attach(video) {
if (!this.mediaKeys_) {
// Unencrypted, or so we think. We listen for encrypted events in order
// to warn when the stream is encrypted, even though the manifest does
// not know it.
// Don't complain about this twice, so just listenOnce().
// FIXME: This is ineffective when a prefixed event is translated by our
// polyfills, since those events are only caught and translated by a
// MediaKeys instance. With clear content and no polyfilled MediaKeys
// instance attached, you'll never see the 'encrypted' event on those
// platforms (Safari).
this.eventManager_.listenOnce(video, 'encrypted', (event) => {
this.onError_(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.ENCRYPTED_CONTENT_WITHOUT_DRM_INFO));
});
return;
}
this.video_ = video;
this.eventManager_.listenOnce(this.video_, 'play', () => this.onPlay_());
if ('webkitCurrentPlaybackTargetIsWireless' in this.video_) {
this.eventManager_.listen(this.video_,
'webkitcurrentplaybacktargetiswirelesschanged',
() => this.closeOpenSessions_());
}
this.manifestInitData_ = this.currentDrmInfo_ ?
(this.currentDrmInfo_.initData.find(
(initDataOverride) => initDataOverride.initData.length > 0,
) || null) : null;
/**
* We can attach media keys before the playback actually begins when:
* - If we are not using FairPlay Modern EME
* - Some initData already has been generated (through the manifest)
* - In case of an offline session
*/
if (this.manifestInitData_ ||
this.currentDrmInfo_.keySystem !== 'com.apple.fps' ||
this.offlineSessionIds_.length) {
await this.attachMediaKeys_();
}
this.createOrLoad();
// Explicit init data for any one stream or an offline session is
// sufficient to suppress 'encrypted' events for all streams.
// Also suppress 'encrypted' events when parsing in-band ppsh
// from media segments because that serves the same purpose as the
// 'encrypted' events.
if (!this.manifestInitData_ && !this.offlineSessionIds_.length &&
!this.config_.parseInbandPsshEnabled) {
this.eventManager_.listen(
this.video_, 'encrypted', (e) => this.onEncryptedEvent_(e));
}
}
/**
* Returns true if the manifest has init data.
*
* @return {boolean}
*/
hasManifestInitData() {
return !!this.manifestInitData_;
}
/**
* Sets the server certificate based on the current DrmInfo.
*
* @return {!Promise}
*/
async setServerCertificate() {
goog.asserts.assert(this.initialized_,
'Must call init() before setServerCertificate');
if (!this.mediaKeys_ || !this.currentDrmInfo_) {
return;
}
if (this.currentDrmInfo_.serverCertificateUri &&
(!this.currentDrmInfo_.serverCertificate ||
!this.currentDrmInfo_.serverCertificate.length)) {
const request = shaka.net.NetworkingEngine.makeRequest(
[this.currentDrmInfo_.serverCertificateUri],
this.config_.retryParameters);
try {
const operation = this.playerInterface_.netEngine.request(
shaka.net.NetworkingEngine.RequestType.SERVER_CERTIFICATE,
request);
const response = await operation.promise;
this.currentDrmInfo_.serverCertificate =
shaka.util.BufferUtils.toUint8(response.data);
} catch (error) {
// Request failed!
goog.asserts.assert(error instanceof shaka.util.Error,
'Wrong NetworkingEngine error type!');
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.SERVER_CERTIFICATE_REQUEST_FAILED,
error);
}
if (this.destroyer_.destroyed()) {
return;
}
}
if (!this.currentDrmInfo_.serverCertificate ||
!this.currentDrmInfo_.serverCertificate.length) {
return;
}
try {
const supported = await this.mediaKeys_.setServerCertificate(
this.currentDrmInfo_.serverCertificate);
if (!supported) {
shaka.log.warning('Server certificates are not supported by the ' +
'key system. The server certificate has been ' +
'ignored.');
}
} catch (exception) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.INVALID_SERVER_CERTIFICATE,
exception.message);
}
}
/**
* Remove an offline session and delete it's data. This can only be called
* after a successful call to |init|. This will wait until the
* 'license-release' message is handled. The returned Promise will be rejected
* if there is an error releasing the license.
*
* @param {string} sessionId
* @return {!Promise}
*/
async removeSession(sessionId) {
goog.asserts.assert(this.mediaKeys_,
'Must call init() before removeSession');
const session = await this.loadOfflineSession_(sessionId);
// This will be null on error, such as session not found.
if (!session) {
shaka.log.v2('Ignoring attempt to remove missing session', sessionId);
return;
}
// TODO: Consider adding a timeout to get the 'message' event.
// Note that the 'message' event will get raised after the remove()
// promise resolves.
const tasks = [];
const found = this.activeSessions_.get(session);
if (found) {
// This will force us to wait until the 'license-release' message has been
// handled.
found.updatePromise = new shaka.util.PublicPromise();
tasks.push(found.updatePromise);
}
shaka.log.v2('Attempting to remove session', sessionId);
tasks.push(session.remove());
await Promise.all(tasks);
this.activeSessions_.delete(session);
}
/**
* Creates the sessions for the init data and waits for them to become ready.
*
* @return {!Promise}
*/
createOrLoad() {
// Create temp sessions.
const initDatas =
(this.currentDrmInfo_ ? this.currentDrmInfo_.initData : []) || [];
for (const initDataOverride of initDatas) {
this.newInitData(
initDataOverride.initDataType, initDataOverride.initData);
}
// Load each session.
for (const sessionId of this.offlineSessionIds_) {
this.loadOfflineSession_(sessionId);
}
// If we have no sessions, we need to resolve the promise right now or else
// it will never get resolved.
if (!initDatas.length && !this.offlineSessionIds_.length) {
this.allSessionsLoaded_.resolve();
}
return this.allSessionsLoaded_;
}
/**
* Called when new initialization data is encountered. If this data hasn't
* been seen yet, this will create a new session for it.
*
* @param {string} initDataType
* @param {!Uint8Array} initData
*/
newInitData(initDataType, initData) {
if (!initData.length) {
return;
}
// Suppress duplicate init data.
// Note that some init data are extremely large and can't portably be used
// as keys in a dictionary.
const metadatas = this.activeSessions_.values();
for (const metadata of metadatas) {
// Tizen 2015 and 2016 models will send multiple webkitneedkey events
// with the same init data. If the duplicates are supressed, playback
// will stall without errors.
if (shaka.util.BufferUtils.equal(initData, metadata.initData) &&
!shaka.util.Platform.isTizen2()) {
shaka.log.debug('Ignoring duplicate init data.');
return;
}
}
// If there are pre-existing sessions that have all been loaded
// then reset the allSessionsLoaded_ promise, which can now be
// used to wait for new sesssions to be loaded
if (this.activeSessions_.size > 0 && this.areAllSessionsLoaded_()) {
this.allSessionsLoaded_.resolve();
this.allSessionsLoaded_ = new shaka.util.PublicPromise();
this.allSessionsLoaded_.catch(() => {});
}
this.createSession(initDataType, initData,
this.currentDrmInfo_.sessionType);
}
/** @return {boolean} */
initialized() {
return this.initialized_;
}
/**
* @param {?shaka.extern.DrmInfo} drmInfo
* @return {string} */
static keySystem(drmInfo) {
return drmInfo ? drmInfo.keySystem : '';
}
/**
* @param {?string} keySystem
* @return {boolean} */
static isPlayReadyKeySystem(keySystem) {
if (keySystem) {
return !!keySystem.match(/^com\.(microsoft|chromecast)\.playready/);
}
return false;
}
/**
* @param {?string} keySystem
* @return {boolean} */
static isFairPlayKeySystem(keySystem) {
if (keySystem) {
return !!keySystem.match(/^com\.apple\.fps/);
}
return false;
}
/**
* Check if DrmEngine (as initialized) will likely be able to support the
* given content type.
*
* @param {string} contentType
* @return {boolean}
*/
willSupport(contentType) {
// Edge 14 does not report correct capabilities. It will only report the
// first MIME type even if the others are supported. To work around this,
// we say that Edge supports everything.
//
// See https://github.com/shaka-project/shaka-player/issues/1495 for details.
if (shaka.util.Platform.isLegacyEdge()) {
return true;
}
contentType = contentType.toLowerCase();
if (shaka.util.Platform.isTizen() &&
contentType.includes('codecs="ac-3"')) {
// Some Tizen devices seem to misreport AC-3 support. This works around
// the issue, by falling back to EC-3, which seems to be supported on the
// same devices and be correctly reported in all cases we have observed.
// See https://github.com/shaka-project/shaka-player/issues/2989 for
// details.
const fallback = contentType.replace('ac-3', 'ec-3');
return this.supportedTypes_.has(contentType) ||
this.supportedTypes_.has(fallback);
}
return this.supportedTypes_.has(contentType);
}
/**
* Returns the ID of the sessions currently active.
*
* @return {!Array.<string>}
*/
getSessionIds() {
const sessions = this.activeSessions_.keys();
const ids = shaka.util.Iterables.map(sessions, (s) => s.sessionId);
// TODO: Make |getSessionIds| return |Iterable| instead of |Array|.
return Array.from(ids);
}
/**
* Returns the next expiration time, or Infinity.
* @return {number}
*/
getExpiration() {
// This will equal Infinity if there are no entries.
let min = Infinity;
const sessions = this.activeSessions_.keys();
for (const session of sessions) {
if (!isNaN(session.expiration)) {
min = Math.min(min, session.expiration);
}
}
return min;
}
/**
* Returns the time spent on license requests during this session, or NaN.
*
* @return {number}
*/
getLicenseTime() {
if (this.licenseTimeSeconds_) {
return this.licenseTimeSeconds_;
}
return NaN;
}
/**
* Returns the DrmInfo that was used to initialize the current key system.
*
* @return {?shaka.extern.DrmInfo}
*/
getDrmInfo() {
return this.currentDrmInfo_;
}
/**
* Return the media keys created from the current mediaKeySystemAccess.
* @return {MediaKeys}
*/
getMediaKeys() {
return this.mediaKeys_;
}
/**
* Returns the current key statuses.
*
* @return {!Object.<string, string>}
*/
getKeyStatuses() {
return shaka.util.MapUtils.asObject(this.announcedKeyStatusByKeyId_);
}
/**
* Returns the current media key sessions.
*
* @return {!Array.<MediaKeySession>}
*/
getMediaKeySessions() {
return Array.from(this.activeSessions_.keys());
}
/**
* @param {shaka.extern.Stream} stream
* @param {string=} codecOverride
* @return {string}
* @private
*/
static computeMimeType_(stream, codecOverride) {
const realMimeType = shaka.util.MimeUtils.getFullType(stream.mimeType,
codecOverride || stream.codecs);
if (shaka.media.Transmuxer.isSupported(realMimeType)) {
// This will be handled by the Transmuxer, so use the MIME type that the
// Transmuxer will produce.
return shaka.media.Transmuxer.convertCodecs(stream.type, realMimeType);
}
return realMimeType;
}
/**
* @param {!Map.<string, MediaKeySystemConfiguration>} configsByKeySystem
* A dictionary of configs, indexed by key system, with an iteration order
* (insertion order) that reflects the preference for the application.
* @param {!Array.<shaka.extern.Variant>} variants
* @return {!Promise} Resolved if/when a key system has been chosen.
* @private
*/
async queryMediaKeys_(configsByKeySystem, variants) {
const drmInfosByKeySystem = new Map();
const mediaKeySystemAccess = variants.length ?
this.getKeySystemAccessFromVariants_(variants, drmInfosByKeySystem) :
await this.getKeySystemAccessByConfigs_(configsByKeySystem);
if (!mediaKeySystemAccess) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.REQUESTED_KEY_SYSTEM_CONFIG_UNAVAILABLE);
}
this.destroyer_.ensureNotDestroyed();
try {
// Get the set of supported content types from the audio and video
// capabilities. Avoid duplicates so that it is easier to read what is
// supported.
this.supportedTypes_.clear();
// Store the capabilities of the key system.
const realConfig = mediaKeySystemAccess.getConfiguration();
shaka.log.v2(
'Got MediaKeySystemAccess with configuration',
realConfig);
const audioCaps = realConfig.audioCapabilities || [];
const videoCaps = realConfig.videoCapabilities || [];
for (const cap of audioCaps) {
this.supportedTypes_.add(cap.contentType.toLowerCase());
}
for (const cap of videoCaps) {
this.supportedTypes_.add(cap.contentType.toLowerCase());
}
goog.asserts.assert(this.supportedTypes_.size,
'We should get at least one supported MIME type');
if (variants.length) {
this.currentDrmInfo_ = this.createDrmInfoByInfos_(
mediaKeySystemAccess.keySystem,
drmInfosByKeySystem.get(mediaKeySystemAccess.keySystem));
} else {
this.currentDrmInfo_ = shaka.media.DrmEngine.createDrmInfoByConfigs_(
mediaKeySystemAccess.keySystem,
configsByKeySystem.get(mediaKeySystemAccess.keySystem));
}
if (!this.currentDrmInfo_.licenseServerUri) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.NO_LICENSE_SERVER_GIVEN,
this.currentDrmInfo_.keySystem);
}
const mediaKeys = await mediaKeySystemAccess.createMediaKeys();
this.destroyer_.ensureNotDestroyed();
shaka.log.info('Created MediaKeys object for key system',
this.currentDrmInfo_.keySystem);
this.mediaKeys_ = mediaKeys;
this.initialized_ = true;
await this.setServerCertificate();
this.destroyer_.ensureNotDestroyed();
} catch (exception) {
this.destroyer_.ensureNotDestroyed(exception);
// Don't rewrap a shaka.util.Error from earlier in the chain:
this.currentDrmInfo_ = null;
this.supportedTypes_.clear();
if (exception instanceof shaka.util.Error) {
throw exception;
}
// We failed to create MediaKeys. This generally shouldn't happen.
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.FAILED_TO_CREATE_CDM,
exception.message);
}
}
/**
* Get the MediaKeySystemAccess from the decodingInfos of the variants.
* @param {!Array.<shaka.extern.Variant>} variants
* @param {!Map.<string, !Array.<shaka.extern.DrmInfo>>} drmInfosByKeySystem
* A dictionary of drmInfos, indexed by key system.
* @return {MediaKeySystemAccess}
* @private
*/
getKeySystemAccessFromVariants_(variants, drmInfosByKeySystem) {
for (const variant of variants) {
// Get all the key systems in the variant that shouldHaveLicenseServer.
const drmInfos = this.getVariantDrmInfos_(variant);
for (const info of drmInfos) {
if (!drmInfosByKeySystem.has(info.keySystem)) {
drmInfosByKeySystem.set(info.keySystem, []);
}
drmInfosByKeySystem.get(info.keySystem).push(info);
}
}
if (drmInfosByKeySystem.size == 1 && drmInfosByKeySystem.has('')) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.NO_RECOGNIZED_KEY_SYSTEMS);
}
// If we have configured preferredKeySystems, choose a preferred keySystem
// if available.
for (const preferredKeySystem of this.config_.preferredKeySystems) {
for (const variant of variants) {
const decodingInfo = variant.decodingInfos.find((decodingInfo) => {
return decodingInfo.supported &&
decodingInfo.keySystemAccess != null &&
decodingInfo.keySystemAccess.keySystem == preferredKeySystem;
});
if (decodingInfo) {
return decodingInfo.keySystemAccess;
}
}
}
// Try key systems with configured license servers first. We only have to
// try key systems without configured license servers for diagnostic
// reasons, so that we can differentiate between "none of these key
// systems are available" and "some are available, but you did not
// configure them properly." The former takes precedence.
for (const shouldHaveLicenseServer of [true, false]) {
for (const variant of variants) {
for (const decodingInfo of variant.decodingInfos) {
if (!decodingInfo.supported || !decodingInfo.keySystemAccess) {
continue;
}
const drmInfos =
drmInfosByKeySystem.get(decodingInfo.keySystemAccess.keySystem);
for (const info of drmInfos) {
if (!!info.licenseServerUri == shouldHaveLicenseServer) {
return decodingInfo.keySystemAccess;
}
}
}
}
}
return null;
}
/**
* Get the MediaKeySystemAccess by querying requestMediaKeySystemAccess.
* @param {!Map.<string, MediaKeySystemConfiguration>} configsByKeySystem
* A dictionary of configs, indexed by key system, with an iteration order
* (insertion order) that reflects the preference for the application.
* @return {!Promise.<MediaKeySystemAccess>} Resolved if/when a
* mediaKeySystemAccess has been chosen.
* @private
*/
async getKeySystemAccessByConfigs_(configsByKeySystem) {
/** @type {MediaKeySystemAccess} */
let mediaKeySystemAccess;
if (configsByKeySystem.size == 1 && configsByKeySystem.has('')) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.NO_RECOGNIZED_KEY_SYSTEMS);
}
// If there are no tracks of a type, these should be not present.
// Otherwise the query will fail.
for (const config of configsByKeySystem.values()) {
if (config.audioCapabilities.length == 0) {
delete config.audioCapabilities;
}
if (config.videoCapabilities.length == 0) {
delete config.videoCapabilities;
}
}
// If we have configured preferredKeySystems, choose the preferred one if
// available.
for (const keySystem of this.config_.preferredKeySystems) {
if (configsByKeySystem.has(keySystem)) {
const config = configsByKeySystem.get(keySystem);
try {
mediaKeySystemAccess = // eslint-disable-next-line no-await-in-loop
await navigator.requestMediaKeySystemAccess(keySystem, [config]);
return mediaKeySystemAccess;
} catch (error) {
// Suppress errors.
shaka.log.v2(
'Requesting', keySystem, 'failed with config', config, error);
}
this.destroyer_.ensureNotDestroyed();
}
}
// Try key systems with configured license servers first. We only have to
// try key systems without configured license servers for diagnostic
// reasons, so that we can differentiate between "none of these key
// systems are available" and "some are available, but you did not
// configure them properly." The former takes precedence.
// TODO: once MediaCap implementation is complete, this part can be
// simplified or removed.
for (const shouldHaveLicenseServer of [true, false]) {
for (const keySystem of configsByKeySystem.keys()) {
const config = configsByKeySystem.get(keySystem);
// TODO: refactor, don't stick drmInfos onto
// MediaKeySystemConfiguration
const hasLicenseServer = config['drmInfos'].some((info) => {
return !!info.licenseServerUri;
});
if (hasLicenseServer != shouldHaveLicenseServer) {
continue;
}
try {
mediaKeySystemAccess = // eslint-disable-next-line no-await-in-loop
await navigator.requestMediaKeySystemAccess(keySystem, [config]);
return mediaKeySystemAccess;
} catch (error) {
// Suppress errors.
shaka.log.v2(
'Requesting', keySystem, 'failed with config', config, error);
}
this.destroyer_.ensureNotDestroyed();
}
}
return mediaKeySystemAccess;
}
/**
* Create a DrmInfo using configured clear keys.
* The server URI will be a data URI which decodes to a clearkey license.
* @return {?shaka.extern.DrmInfo} or null if clear keys are not configured.
* @private
* @see https://bit.ly/2K8gOnv for the spec on the clearkey license format.
*/
configureClearKey_() {
const clearKeys = shaka.util.MapUtils.asMap(this.config_.clearKeys);
if (clearKeys.size == 0) {
return null;
}
const StringUtils = shaka.util.StringUtils;
const Uint8ArrayUtils = shaka.util.Uint8ArrayUtils;
const keys = [];
const keyIds = [];
clearKeys.forEach((key, keyId) => {
let kid = keyId;
if (kid.length != 22) {
kid = Uint8ArrayUtils.toBase64(
Uint8ArrayUtils.fromHex(keyId), false);
}
let k = key;
if (k.length != 22) {
k = Uint8ArrayUtils.toBase64(
Uint8ArrayUtils.fromHex(key), false);
}
const keyObj = {
kty: 'oct',
kid: kid,
k: k,
};
keys.push(keyObj);
keyIds.push(keyObj.kid);
});
const jwkSet = {keys: keys};
const license = JSON.stringify(jwkSet);
// Use the keyids init data since is suggested by EME.
// Suggestion: https://bit.ly/2JYcNTu
// Format: https://www.w3.org/TR/eme-initdata-keyids/
const initDataStr = JSON.stringify({'kids': keyIds});
const initData =
shaka.util.BufferUtils.toUint8(StringUtils.toUTF8(initDataStr));
const initDatas = [{initData: initData, initDataType: 'keyids'}];
return {
keySystem: 'org.w3.clearkey',
licenseServerUri: 'data:application/json;base64,' + window.btoa(license),
distinctiveIdentifierRequired: false,
persistentStateRequired: false,
audioRobustness: '',
videoRobustness: '',
serverCertificate: null,
serverCertificateUri: '',
sessionType: '',
initData: initDatas,
keyIds: new Set(keyIds),
};
}
/**
* @param {string} sessionId
* @return {!Promise.<MediaKeySession>}
* @private
*/
async loadOfflineSession_(sessionId) {
let session;
const sessionType = 'persistent-license';
try {
shaka.log.v1('Attempting to load an offline session', sessionId);
session = this.mediaKeys_.createSession(sessionType);
} catch (exception) {
const error = new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.FAILED_TO_CREATE_SESSION,
exception.message);
this.onError_(error);
return Promise.reject(error);
}
this.eventManager_.listen(session, 'message',
/** @type {shaka.util.EventManager.ListenerType} */(
(event) => this.onSessionMessage_(event)));
this.eventManager_.listen(session, 'keystatuseschange',
(event) => this.onKeyStatusesChange_(event));
const metadata = {
initData: null,
initDataType: null,
loaded: false,
oldExpiration: Infinity,
updatePromise: null,
type: sessionType,
};
this.activeSessions_.set(session, metadata);
try {
const present = await session.load(sessionId);
this.destroyer_.ensureNotDestroyed();
shaka.log.v2('Loaded offline session', sessionId, present);
if (!present) {
this.activeSessions_.delete(session);
this.onError_(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.OFFLINE_SESSION_REMOVED));
return Promise.resolve();
}
// TODO: We should get a key status change event. Remove once Chrome CDM
// is fixed.
metadata.loaded = true;
if (this.areAllSessionsLoaded_()) {
this.allSessionsLoaded_.resolve();
}
return session;
} catch (error) {
this.destroyer_.ensureNotDestroyed(error);
this.activeSessions_.delete(session);
this.onError_(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.FAILED_TO_CREATE_SESSION,
error.message));
}
return Promise.resolve();
}
/**
* @param {string} initDataType
* @param {!Uint8Array} initData
* @param {string} sessionType
*/
createSession(initDataType, initData, sessionType) {
goog.asserts.assert(this.mediaKeys_,
'mediaKeys_ should be valid when creating temporary session.');
let session;
try {
shaka.log.info('Creating new', sessionType, 'session');
session = this.mediaKeys_.createSession(sessionType);
} catch (exception) {
this.onError_(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.FAILED_TO_CREATE_SESSION,
exception.message));
return;
}
this.eventManager_.listen(session, 'message',
/** @type {shaka.util.EventManager.ListenerType} */(
(event) => this.onSessionMessage_(event)));
this.eventManager_.listen(session, 'keystatuseschange',
(event) => this.onKeyStatusesChange_(event));
const metadata = {
initData: initData,
initDataType: initDataType,
loaded: false,
oldExpiration: Infinity,
updatePromise: null,
type: sessionType,
};
this.activeSessions_.set(session, metadata);
try {
initData = this.config_.initDataTransform(
initData, initDataType, this.currentDrmInfo_);
} catch (error) {
let shakaError = error;
if (!(error instanceof shaka.util.Error)) {
shakaError = new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.INIT_DATA_TRANSFORM_ERROR,
error);
}
this.onError_(shakaError);
return;
}
if (this.config_.logLicenseExchange) {
const str = shaka.util.Uint8ArrayUtils.toBase64(initData);
shaka.log.info('EME init data: type=', initDataType, 'data=', str);
}
session.generateRequest(initDataType, initData).catch((error) => {
if (this.destroyer_.destroyed()) {
return;
}
goog.asserts.assert(error instanceof Error, 'Wrong error type!');
this.activeSessions_.delete(session);
// This may be supplied by some polyfills.
/** @type {MediaKeyError} */
const errorCode = error['errorCode'];
let extended;
if (errorCode && errorCode.systemCode) {
extended = errorCode.systemCode;
if (extended < 0) {
extended += Math.pow(2, 32);
}
extended = '0x' + extended.toString(16);
}
this.onError_(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.FAILED_TO_GENERATE_LICENSE_REQUEST,
error.message, error, extended));
});
}
/**
* @param {!MediaKeyMessageEvent} event
* @private
*/
onSessionMessage_(event) {
if (this.delayLicenseRequest_()) {
this.mediaKeyMessageEvents_.push(event);
} else {
this.sendLicenseRequest_(event);
}
}
/**
* @return {boolean}
* @private
*/
delayLicenseRequest_() {
if (!this.video_) {
// If there's no video, don't delay the license request; i.e., in the case
// of offline storage.
return false;
}
return (this.config_.delayLicenseRequestUntilPlayed &&
this.video_.paused && !this.initialRequestsSent_);
}
/**
* Sends a license request.
* @param {!MediaKeyMessageEvent} event
* @private
*/
async sendLicenseRequest_(event) {
/** @type {!MediaKeySession} */
const session = event.target;
shaka.log.v1(
'Sending license request for session', session.sessionId, 'of type',
event.messageType);
if (this.config_.logLicenseExchange) {
const str = shaka.util.Uint8ArrayUtils.toBase64(event.message);
shaka.log.info('EME license request', str);
}
const metadata = this.activeSessions_.get(session);
let url = this.currentDrmInfo_.licenseServerUri;
const advancedConfig =
this.config_.advanced[this.currentDrmInfo_.keySystem];
if (event.messageType == 'individualization-request' && advancedConfig &&
advancedConfig.individualizationServer) {
url = advancedConfig.individualizationServer;
}
const requestType = shaka.net.NetworkingEngine.RequestType.LICENSE;
const request = shaka.net.NetworkingEngine.makeRequest(
[url], this.config_.retryParameters);
request.body = event.message;
request.method = 'POST';
request.licenseRequestType = event.messageType;
request.sessionId = session.sessionId;
request.drmInfo = this.currentDrmInfo_;
if (metadata) {
request.initData = metadata.initData;
request.initDataType = metadata.initDataType;
}
// NOTE: allowCrossSiteCredentials can be set in a request filter.
if (shaka.media.DrmEngine.isPlayReadyKeySystem(
this.currentDrmInfo_.keySystem)) {
this.unpackPlayReadyRequest_(request);
}
const startTimeRequest = Date.now();
let response;
try {
const req = this.playerInterface_.netEngine.request(requestType, request);
response = await req.promise;
} catch (error) {
// Request failed!
goog.asserts.assert(error instanceof shaka.util.Error,
'Wrong NetworkingEngine error type!');
const shakaErr = new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.LICENSE_REQUEST_FAILED,
error);
this.onError_(shakaErr);
if (metadata && metadata.updatePromise) {
metadata.updatePromise.reject(shakaErr);
}
return;
}
if (this.destroyer_.destroyed()) {
return;
}
this.licenseTimeSeconds_ += (Date.now() - startTimeRequest) / 1000;
if (this.config_.logLicenseExchange) {
const str = shaka.util.Uint8ArrayUtils.toBase64(response.data);
shaka.log.info('EME license response', str);
}
// Request succeeded, now pass the response to the CDM.
try {
shaka.log.v1('Updating session', session.sessionId);
await session.update(response.data);
} catch (error) {
// Session update failed!
const shakaErr = new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.LICENSE_RESPONSE_REJECTED,
error.message);
this.onError_(shakaErr);
if (metadata && metadata.updatePromise) {
metadata.updatePromise.reject(shakaErr);
}
return;
}
if (this.destroyer_.destroyed()) {
return;
}
const updateEvent = new shaka.util.FakeEvent('drmsessionupdate');
this.playerInterface_.onEvent(updateEvent);
if (metadata) {
if (metadata.updatePromise) {
metadata.updatePromise.resolve();
}
// In case there are no key statuses, consider this session loaded
// after a reasonable timeout. It should definitely not take 5
// seconds to process a license.
const timer = new shaka.util.Timer(() => {
metadata.loaded = true;
if (this.areAllSessionsLoaded_()) {
this.allSessionsLoaded_.resolve();
}
});
timer.tickAfter(
/* seconds= */ shaka.media.DrmEngine.SESSION_LOAD_TIMEOUT_);
}
}
/**
* Unpacks PlayReady license requests. Modifies the request object.
* @param {shaka.extern.Request} request
* @private
*/
unpackPlayReadyRequest_(request) {
// On Edge, the raw license message is UTF-16-encoded XML. We need
// to unpack the Challenge element (base64-encoded string containing the
// actual license request) and any HttpHeader elements (sent as request
// headers).
// Example XML:
// <PlayReadyKeyMessage type="LicenseAcquisition">
// <LicenseAcquisition Version="1">
// <Challenge encoding="base64encoded">{Base64Data}</Challenge>
// <HttpHeaders>
// <HttpHeader>
// <name>Content-Type</name>
// <value>text/xml; charset=utf-8</value>
// </HttpHeader>
// <HttpHeader>
// <name>SOAPAction</name>
// <value>http://schemas.microsoft.com/DRM/etc/etc</value>
// </HttpHeader>
// </HttpHeaders>
// </LicenseAcquisition>
// </PlayReadyKeyMessage>
const xml = shaka.util.StringUtils.fromUTF16(
request.body, /* littleEndian= */ true, /* noThrow= */ true);
if (!xml.includes('PlayReadyKeyMessage')) {
// This does not appear to be a wrapped message as on Edge. Some
// clients do not need this unwrapping, so we will assume this is one of
// them. Note that "xml" at this point probably looks like random
// garbage, since we interpreted UTF-8 as UTF-16.
shaka.log.debug('PlayReady request is already unwrapped.');
request.headers['Content-Type'] = 'text/xml; charset=utf-8';
return;
}
shaka.log.debug('Unwrapping PlayReady request.');
const dom = shaka.util.XmlUtils.parseXmlString(xml, 'PlayReadyKeyMessage');
goog.asserts.assert(dom, 'Failed to parse PlayReady XML!');
// Set request headers.
const headers = dom.getElementsByTagName('HttpHeader');
for (const header of headers) {
const name = header.getElementsByTagName('name')[0];
const value = header.getElementsByTagName('value')[0];
goog.asserts.assert(name && value, 'Malformed PlayReady headers!');
request.headers[name.textContent] = value.textContent;
}
// Unpack the base64-encoded challenge.
const challenge = dom.getElementsByTagName('Challenge')[0];
goog.asserts.assert(challenge, 'Malformed PlayReady challenge!');
goog.asserts.assert(challenge.getAttribute('encoding') == 'base64encoded',
'Unexpected PlayReady challenge encoding!');
request.body = shaka.util.Uint8ArrayUtils.fromBase64(challenge.textContent);
}
/**
* @param {!Event} event
* @private
* @suppress {invalidCasts} to swap keyId and status
*/
onKeyStatusesChange_(event) {
const session = /** @type {!MediaKeySession} */(event.target);
shaka.log.v2('Key status changed for session', session.sessionId);
const found = this.activeSessions_.get(session);
const keyStatusMap = session.keyStatuses;
let hasExpiredKeys = false;
keyStatusMap.forEach((status, keyId) => {
// The spec has changed a few times on the exact order of arguments here.
// As of 2016-06-30, Edge has the order reversed compared to the current
// EME spec. Given the back and forth in the spec, it may not be the only
// one. Try to detect this and compensate:
if (typeof keyId == 'string') {
const tmp = keyId;
keyId = /** @type {!ArrayBuffer} */(status);
status = /** @type {string} */(tmp);
}
// Microsoft's implementation in Edge seems to present key IDs as
// little-endian UUIDs, rather than big-endian or just plain array of
// bytes.
// standard: 6e 5a 1d 26 - 27 57 - 47 d7 - 80 46 ea a5 d1 d3 4b 5a
// on Edge: 26 1d 5a 6e - 57 27 - d7 47 - 80 46 ea a5 d1 d3 4b 5a
// Bug filed: https://bit.ly/2thuzXu
// NOTE that we skip this if byteLength != 16. This is used for Edge
// which uses single-byte dummy key IDs.
// However, unlike Edge and Chromecast, Tizen doesn't have this problem.
if (shaka.media.DrmEngine.isPlayReadyKeySystem(
this.currentDrmInfo_.keySystem) &&
keyId.byteLength == 16 &&
(shaka.util.Platform.isEdge() || shaka.util.Platform.isPS4())) {
// Read out some fields in little-endian:
const dataView = shaka.util.BufferUtils.toDataView(keyId);
const part0 = dataView.getUint32(0, /* LE= */ true);
const part1 = dataView.getUint16(4, /* LE= */ true);
const part2 = dataView.getUint16(6, /* LE= */ true);
// Write it back in big-endian:
dataView.setUint32(0, part0, /* BE= */ false);
dataView.setUint16(4, part1, /* BE= */ false);
dataView.setUint16(6, part2, /* BE= */ false);
}
if (status != 'status-pending') {
found.loaded = true;
}
if (!found) {
// We can get a key status changed for a closed session after it has
// been removed from |activeSessions_|. If it is closed, none of its
// keys should be usable.
goog.asserts.assert(
status != 'usable', 'Usable keys found in closed session');
}
if (status == 'expired') {
hasExpiredKeys = true;
}
const keyIdHex = shaka.util.Uint8ArrayUtils.toHex(keyId).slice(0, 32);
this.keyStatusByKeyId_.set(keyIdHex, status);
});
// If the session has expired, close it.
// Some CDMs do not have sub-second time resolution, so the key status may
// fire with hundreds of milliseconds left until the stated expiration time.
const msUntilExpiration = session.expiration - Date.now();
if (msUntilExpiration < 0 || (hasExpiredKeys && msUntilExpiration < 1000)) {
// If this is part of a remove(), we don't want to close the session until
// the update is complete. Otherwise, we will orphan the session.
if (found && !found.updatePromise) {
shaka.log.debug('Session has expired', session.sessionId);
this.activeSessions_.delete(session);
session.close().catch(() => {}); // Silence uncaught rejection errors
}
}
if (!this.areAllSessionsLoaded_()) {
// Don't announce key statuses or resolve the "all loaded" promise until
// everything is loaded.
return;
}
this.allSessionsLoaded_.resolve();
// Batch up key status changes before checking them or notifying Player.
// This handles cases where the statuses of multiple sessions are set
// simultaneously by the browser before dispatching key status changes for
// each of them. By batching these up, we only send one status change event
// and at most one EXPIRED error on expiration.
this.keyStatusTimer_.tickAfter(
/* seconds= */ shaka.media.DrmEngine.KEY_STATUS_BATCH_TIME);
}
/** @private */
processKeyStatusChanges_() {
const privateMap = this.keyStatusByKeyId_;
const publicMap = this.announcedKeyStatusByKeyId_;
// Copy the latest key statuses into the publicly-accessible map.
publicMap.clear();
privateMap.forEach((status, keyId) => publicMap.set(keyId, status));
// If all keys are expired, fire an error. |every| is always true for an
// empty array but we shouldn't fire an error for a lack of key status info.
const statuses = Array.from(publicMap.values());
const allExpired = statuses.length &&
statuses.every((status) => status == 'expired');
if (allExpired) {
this.onError_(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.EXPIRED));
}
this.playerInterface_.onKeyStatus(shaka.util.MapUtils.asObject(publicMap));
}
/**
* Returns true if the browser has recent EME APIs.
*
* @return {boolean}
*/
static isBrowserSupported() {
const basic =
!!window.MediaKeys &&
!!window.navigator &&
!!window.navigator.requestMediaKeySystemAccess &&
!!window.MediaKeySystemAccess &&
// eslint-disable-next-line no-restricted-syntax
!!window.MediaKeySystemAccess.prototype.getConfiguration;
return basic;
}
/**
* Returns a Promise to a map of EME support for well-known key systems.
*
* @return {!Promise.<!Object.<string, ?shaka.extern.DrmSupportType>>}
*/
static async probeSupport() {
goog.asserts.assert(shaka.media.DrmEngine.isBrowserSupported(),
'Must have basic EME support');
const testKeySystems = [
'org.w3.clearkey',
'com.widevine.alpha',
'com.microsoft.playready',
'com.microsoft.playready.recommendation',
'com.apple.fps.1_0',
'com.apple.fps',
'com.adobe.primetime',
];
const basicVideoCapabilities = [
{contentType: 'video/mp4; codecs="avc1.42E01E"'},
{contentType: 'video/webm; codecs="vp8"'},
];
const basicConfig = {
initDataTypes: ['cenc'],
videoCapabilities: basicVideoCapabilities,
};
const offlineConfig = {
videoCapabilities: basicVideoCapabilities,
persistentState: 'required',
sessionTypes: ['persistent-license'],
};
// Try the offline config first, then fall back to the basic config.
const configs = [offlineConfig, basicConfig];
/** @type {!Map.<string, ?shaka.extern.DrmSupportType>} */
const support = new Map();
const testSystem = async (keySystem) => {
try {
// Our Polyfill will reject anything apart com.apple.fps key systems.
// It seems the Safari modern EME API will allow to request a
// MediaKeySystemAccess for the ClearKey CDM, create and update a key
// session but playback will never start
// Safari bug: https://bugs.webkit.org/show_bug.cgi?id=231006
if (keySystem === 'org.w3.clearkey' &&
shaka.util.Platform.isSafari()) {
throw new Error('Unsupported keySystem');
}
const access = await navigator.requestMediaKeySystemAccess(
keySystem, configs);
// Edge doesn't return supported session types, but current versions
// do not support persistent-license. If sessionTypes is missing,
// assume no support for persistent-license.
// TODO: Polyfill Edge to return known supported session types.
// Edge bug: https://bit.ly/2IeKzho
const sessionTypes = access.getConfiguration().sessionTypes;
let persistentState = sessionTypes ?
sessionTypes.includes('persistent-license') : false;
// Tizen 3.0 doesn't support persistent licenses, but reports that it
// does. It doesn't fail until you call update() with a license
// response, which is way too late.
// This is a work-around for #894.
if (shaka.util.Platform.isTizen3()) {
persistentState = false;
}
support.set(keySystem, {persistentState: persistentState});
await access.createMediaKeys();
} catch (e) {
// Either the request failed or createMediaKeys failed.
// Either way, write null to the support object.
support.set(keySystem, null);
}
};
// Test each key system.
const tests = testKeySystems.map((keySystem) => testSystem(keySystem));
await Promise.all(tests);
return shaka.util.MapUtils.asObject(support);
}
/** @private */
onPlay_() {
for (const event of this.mediaKeyMessageEvents_) {
this.sendLicenseRequest_(event);
}
this.initialRequestsSent_ = true;
this.mediaKeyMessageEvents_ = [];
}
/**
* Close a drm session while accounting for a bug in Chrome. Sometimes the
* Promise returned by close() never resolves.
*
* See issue #2741 and http://crbug.com/1108158.
* @param {!MediaKeySession} session
* @return {!Promise}
* @private
*/
async closeSession_(session) {
const DrmEngine = shaka.media.DrmEngine;
const timeout = new Promise((resolve, reject) => {
const timer = new shaka.util.Timer(reject);
timer.tickAfter(DrmEngine.CLOSE_TIMEOUT_);
});
try {
await Promise.race([
Promise.all([session.close(), session.closed]),
timeout,
]);
} catch (e) {
shaka.log.warning('Timeout waiting for session close');
}
}
/** @private */
async closeOpenSessions_() {
// Close all open sessions.
const openSessions = Array.from(this.activeSessions_.entries());
this.activeSessions_.clear();
// Close all sessions before we remove media keys from the video element.
await Promise.all(openSessions.map(async ([session, metadata]) => {
try {
/**
* Special case when a persistent-license session has been initiated,
* without being registered in the offline sessions at start-up.
* We should remove the session to prevent it from being orphaned after
* the playback session ends
*/
if (!this.initializedForStorage_ &&
!this.offlineSessionIds_.includes(session.sessionId) &&
metadata.type === 'persistent-license') {
shaka.log.v1('Removing session', session.sessionId);
await session.remove();
} else {
shaka.log.v1('Closing session', session.sessionId, metadata);
await this.closeSession_(session);
}
} catch (error) {
// Ignore errors when closing the sessions. Closing a session that
// generated no key requests will throw an error.
shaka.log.error('Failed to close or remove the session', error);
}
}));
}
/**
* Check if a variant is likely to be supported by DrmEngine. This will err on
* the side of being too accepting and may not reject a variant that it will
* later fail to play.
*
* @param {!shaka.extern.Variant} variant
* @return {boolean}
*/
supportsVariant(variant) {
/** @type {?shaka.extern.Stream} */
const audio = variant.audio;
/** @type {?shaka.extern.Stream} */
const video = variant.video;
if (audio && audio.encrypted) {
const audioContentType = shaka.media.DrmEngine.computeMimeType_(audio);
if (!this.willSupport(audioContentType)) {
return false;
}
}
if (video && video.encrypted) {
const videoContentType = shaka.media.DrmEngine.computeMimeType_(video);
if (!this.willSupport(videoContentType)) {
return false;
}
}
const keySystem = shaka.media.DrmEngine.keySystem(this.currentDrmInfo_);
const drmInfos = this.getVariantDrmInfos_(variant);
return drmInfos.length == 0 ||
drmInfos.some((drmInfo) => drmInfo.keySystem == keySystem);
}
/**
* Checks if two DrmInfos can be decrypted using the same key system.
* Clear content is considered compatible with every key system.
*
* @param {!Array.<!shaka.extern.DrmInfo>} drms1
* @param {!Array.<!shaka.extern.DrmInfo>} drms2
* @return {boolean}
*/
static areDrmCompatible(drms1, drms2) {
if (!drms1.length || !drms2.length) {
return true;
}
return shaka.media.DrmEngine.getCommonDrmInfos(
drms1, drms2).length > 0;
}
/**
* Returns an array of drm infos that are present in both input arrays.
* If one of the arrays is empty, returns the other one since clear
* content is considered compatible with every drm info.
*
* @param {!Array.<!shaka.extern.DrmInfo>} drms1
* @param {!Array.<!shaka.extern.DrmInfo>} drms2
* @return {!Array.<!shaka.extern.DrmInfo>}
*/
static getCommonDrmInfos(drms1, drms2) {
if (!drms1.length) {
return drms2;
}
if (!drms2.length) {
return drms1;
}
const commonDrms = [];
for (const drm1 of drms1) {
for (const drm2 of drms2) {
if (drm1.keySystem == drm2.keySystem) {
const initDataMap = new Map();
const bothInitDatas = (drm1.initData || [])
.concat(drm2.initData || []);
for (const d of bothInitDatas) {
initDataMap.set(d.keyId, d);
}
const initData = Array.from(initDataMap.values());
const keyIds = drm1.keyIds && drm2.keyIds ?
new Set([...drm1.keyIds, ...drm2.keyIds]) :
drm1.keyIds || drm2.keyIds;
const mergedDrm = {
keySystem: drm1.keySystem,
licenseServerUri: drm1.licenseServerUri || drm2.licenseServerUri,
distinctiveIdentifierRequired: drm1.distinctiveIdentifierRequired ||
drm2.distinctiveIdentifierRequired,
persistentStateRequired: drm1.persistentStateRequired ||
drm2.persistentStateRequired,
videoRobustness: drm1.videoRobustness || drm2.videoRobustness,
audioRobustness: drm1.audioRobustness || drm2.audioRobustness,
serverCertificate: drm1.serverCertificate || drm2.serverCertificate,
serverCertificateUri: drm1.serverCertificateUri ||
drm2.serverCertificateUri,
initData,
keyIds,
};
commonDrms.push(mergedDrm);
break;
}
}
}
return commonDrms;
}
/**
* Concat the audio and video drmInfos in a variant.
* @param {shaka.extern.Variant} variant
* @return {!Array.<!shaka.extern.DrmInfo>}
* @private
*/
getVariantDrmInfos_(variant) {
const videoDrmInfos = variant.video ? variant.video.drmInfos : [];
const audioDrmInfos = variant.audio ? variant.audio.drmInfos : [];
return videoDrmInfos.concat(audioDrmInfos);
}
/**
* Called in an interval timer to poll the expiration times of the sessions.
* We don't get an event from EME when the expiration updates, so we poll it
* so we can fire an event when it happens.
* @private
*/
pollExpiration_() {
this.activeSessions_.forEach((metadata, session) => {
const oldTime = metadata.oldExpiration;
let newTime = session.expiration;
if (isNaN(newTime)) {
newTime = Infinity;
}
if (newTime != oldTime) {
this.playerInterface_.onExpirationUpdated(session.sessionId, newTime);
metadata.oldExpiration = newTime;
}
});
}
/**
* @return {boolean}
* @private
*/
areAllSessionsLoaded_() {
const metadatas = this.activeSessions_.values();
return shaka.util.Iterables.every(metadatas, (data) => data.loaded);
}
/**
* Replace the drm info used in each variant in |variants| to reflect each
* key service in |keySystems|.
*
* @param {!Array.<shaka.extern.Variant>} variants
* @param {!Map.<string, string>} keySystems
* @private
*/
static replaceDrmInfo_(variants, keySystems) {
const drmInfos = [];
keySystems.forEach((uri, keySystem) => {
drmInfos.push({
keySystem: keySystem,
licenseServerUri: uri,
distinctiveIdentifierRequired: false,
persistentStateRequired: false,
audioRobustness: '',
videoRobustness: '',
serverCertificate: null,
serverCertificateUri: '',
initData: [],
keyIds: new Set(),
});
});
for (const variant of variants) {
if (variant.video) {
variant.video.drmInfos = drmInfos;
}
if (variant.audio) {
variant.audio.drmInfos = drmInfos;
}
}
}
/**
* Creates a DrmInfo object describing the settings used to initialize the
* engine.
*
* @param {string} keySystem
* @param {!Array.<shaka.extern.DrmInfo>} drmInfos
* @return {shaka.extern.DrmInfo}
*
* @private
*/
createDrmInfoByInfos_(keySystem, drmInfos) {
/** @type {!Array.<string>} */
const licenseServers = [];
/** @type {!Array.<string>} */
const serverCertificateUris = [];
/** @type {!Array.<!Uint8Array>} */
const serverCerts = [];
/** @type {!Array.<!shaka.extern.InitDataOverride>} */
const initDatas = [];
/** @type {!Set.<string>} */
const keyIds = new Set();
shaka.media.DrmEngine.processDrmInfos_(
drmInfos, licenseServers, serverCerts,
serverCertificateUris, initDatas, keyIds);
if (serverCerts.length > 1) {
shaka.log.warning('Multiple unique server certificates found! ' +
'Only the first will be used.');
}
if (licenseServers.length > 1) {
shaka.log.warning('Multiple unique license server URIs found! ' +
'Only the first will be used.');
}
if (serverCertificateUris.length > 1) {
shaka.log.warning('Multiple unique server certificate URIs found! ' +
'Only the first will be used.');
}
const defaultSessionType =
this.usePersistentLicenses_ ? 'persistent-license' : 'temporary';
/** @type {shaka.extern.DrmInfo} */
const res = {
keySystem,
licenseServerUri: licenseServers[0],
distinctiveIdentifierRequired: drmInfos[0].distinctiveIdentifierRequired,
persistentStateRequired: drmInfos[0].persistentStateRequired,
sessionType: drmInfos[0].sessionType || defaultSessionType,
audioRobustness: drmInfos[0].audioRobustness || '',
videoRobustness: drmInfos[0].videoRobustness || '',
serverCertificate: serverCerts[0],
serverCertificateUri: serverCertificateUris[0],
initData: initDatas,
keyIds,
};
for (const info of drmInfos) {
if (info.distinctiveIdentifierRequired) {
res.distinctiveIdentifierRequired = info.distinctiveIdentifierRequired;
}
if (info.persistentStateRequired) {
res.persistentStateRequired = info.persistentStateRequired;
}
}
return res;
}
/**
* Creates a DrmInfo object describing the settings used to initialize the
* engine.
*
* @param {string} keySystem
* @param {MediaKeySystemConfiguration} config
* @return {shaka.extern.DrmInfo}
*
* @private
*/
static createDrmInfoByConfigs_(keySystem, config) {
/** @type {!Array.<string>} */
const licenseServers = [];
/** @type {!Array.<string>} */
const serverCertificateUris = [];
/** @type {!Array.<!Uint8Array>} */
const serverCerts = [];
/** @type {!Array.<!shaka.extern.InitDataOverride>} */
const initDatas = [];
/** @type {!Set.<string>} */
const keyIds = new Set();
// TODO: refactor, don't stick drmInfos onto MediaKeySystemConfiguration
shaka.media.DrmEngine.processDrmInfos_(
config['drmInfos'], licenseServers, serverCerts,
serverCertificateUris, initDatas, keyIds);
if (serverCerts.length > 1) {
shaka.log.warning('Multiple unique server certificates found! ' +
'Only the first will be used.');
}
if (serverCertificateUris.length > 1) {
shaka.log.warning('Multiple unique server certificate URIs found! ' +
'Only the first will be used.');
}
if (licenseServers.length > 1) {
shaka.log.warning('Multiple unique license server URIs found! ' +
'Only the first will be used.');
}
// TODO: This only works when all DrmInfo have the same robustness.
const audioRobustness =
config.audioCapabilities ? config.audioCapabilities[0].robustness : '';
const videoRobustness =
config.videoCapabilities ? config.videoCapabilities[0].robustness : '';
const distinctiveIdentifier = config.distinctiveIdentifier;
return {
keySystem,
licenseServerUri: licenseServers[0],
distinctiveIdentifierRequired: (distinctiveIdentifier == 'required'),
persistentStateRequired: (config.persistentState == 'required'),
sessionType: config.sessionTypes[0] || 'temporary',
audioRobustness: audioRobustness || '',
videoRobustness: videoRobustness || '',
serverCertificate: serverCerts[0],
serverCertificateUri: serverCertificateUris[0],
initData: initDatas,
keyIds,
};
}
/**
* Extract license server, server cert, and init data from |drmInfos|, taking
* care to eliminate duplicates.
*
* @param {!Array.<shaka.extern.DrmInfo>} drmInfos
* @param {!Array.<string>} licenseServers
* @param {!Array.<!Uint8Array>} serverCerts
* @param {!Array.<string>} serverCertificateUris
* @param {!Array.<!shaka.extern.InitDataOverride>} initDatas
* @param {!Set.<string>} keyIds
* @private
*/
static processDrmInfos_(
drmInfos, licenseServers, serverCerts,
serverCertificateUris, initDatas, keyIds) {
/** @type {function(shaka.extern.InitDataOverride,
* shaka.extern.InitDataOverride):boolean} */
const initDataOverrideEqual = (a, b) => {
if (a.keyId && a.keyId == b.keyId) {
// Two initDatas with the same keyId are considered to be the same,
// unless that "same keyId" is null.
return true;
}
return a.initDataType == b.initDataType &&
shaka.util.BufferUtils.equal(a.initData, b.initData);
};
for (const drmInfo of drmInfos) {
// Build an array of unique license servers.
if (!licenseServers.includes(drmInfo.licenseServerUri)) {
licenseServers.push(drmInfo.licenseServerUri);
}
// Build an array of unique license servers.
if (!serverCertificateUris.includes(drmInfo.serverCertificateUri)) {
serverCertificateUris.push(drmInfo.serverCertificateUri);
}
// Build an array of unique server certs.
if (drmInfo.serverCertificate) {
const found = serverCerts.some(
(cert) => shaka.util.BufferUtils.equal(
cert, drmInfo.serverCertificate));
if (!found) {
serverCerts.push(drmInfo.serverCertificate);
}
}
// Build an array of unique init datas.
if (drmInfo.initData) {
for (const initDataOverride of drmInfo.initData) {
const found = initDatas.some(
(initData) =>
initDataOverrideEqual(initData, initDataOverride));
if (!found) {
initDatas.push(initDataOverride);
}
}
}
if (drmInfo.keyIds) {
for (const keyId of drmInfo.keyIds) {
keyIds.add(keyId);
}
}
}
}
/**
* Use |servers| and |advancedConfigs| to fill in missing values in drmInfo
* that the parser left blank. Before working with any drmInfo, it should be
* passed through here as it is uncommon for drmInfo to be complete when
* fetched from a manifest because most manifest formats do not have the
* required information. Also applies the key systems mapping.
*
* @param {shaka.extern.DrmInfo} drmInfo
* @param {!Map.<string, string>} servers
* @param {!Map.<string, shaka.extern.AdvancedDrmConfiguration>}
* advancedConfigs
* @param {!Object.<string, string>} keySystemsMapping
* @private
*/
static fillInDrmInfoDefaults_(drmInfo, servers, advancedConfigs,
keySystemsMapping) {
const originalKeySystem = drmInfo.keySystem;
if (!originalKeySystem) {
// This is a placeholder from the manifest parser for an unrecognized key
// system. Skip this entry, to avoid logging nonsensical errors.
return;
}
// The order of preference for drmInfo:
// 1. Clear Key config, used for debugging, should override everything else.
// (The application can still specify a clearkey license server.)
// 2. Application-configured servers, if any are present, should override
// anything from the manifest. Nuance: if key system A is in the
// manifest and key system B is in the player config, only B will be
// used, not A.
// 3. Manifest-provided license servers are only used if nothing else is
// specified.
// This is important because it allows the application a clear way to
// indicate which DRM systems should be used on platforms with multiple DRM
// systems.
// The only way to get license servers from the manifest is not to specify
// any in your player config.
if (originalKeySystem == 'org.w3.clearkey' && drmInfo.licenseServerUri) {
// Preference 1: Clear Key with pre-configured keys will have a data URI
// assigned as its license server. Don't change anything.
return;
} else if (servers.size) {
// Preference 2: If anything is configured at the application level,
// override whatever was in the manifest.
const server = servers.get(originalKeySystem) || '';
drmInfo.licenseServerUri = server;
} else {
// Preference 3: Keep whatever we had in drmInfo.licenseServerUri, which
// comes from the manifest.
}
if (!drmInfo.keyIds) {
drmInfo.keyIds = new Set();
}
const advancedConfig = advancedConfigs.get(originalKeySystem);
if (advancedConfig) {
if (!drmInfo.distinctiveIdentifierRequired) {
drmInfo.distinctiveIdentifierRequired =
advancedConfig.distinctiveIdentifierRequired;
}
if (!drmInfo.persistentStateRequired) {
drmInfo.persistentStateRequired =
advancedConfig.persistentStateRequired;
}
if (!drmInfo.videoRobustness) {
drmInfo.videoRobustness = advancedConfig.videoRobustness;
}
if (!drmInfo.audioRobustness) {
drmInfo.audioRobustness = advancedConfig.audioRobustness;
}
if (!drmInfo.serverCertificate) {
drmInfo.serverCertificate = advancedConfig.serverCertificate;
}
if (advancedConfig.sessionType) {
drmInfo.sessionType = advancedConfig.sessionType;
}
if (!drmInfo.serverCertificateUri) {
drmInfo.serverCertificateUri = advancedConfig.serverCertificateUri;
}
}
if (keySystemsMapping[originalKeySystem]) {
drmInfo.keySystem = keySystemsMapping[originalKeySystem];
}
// Chromecast has a variant of PlayReady that uses a different key
// system ID. Since manifest parsers convert the standard PlayReady
// UUID to the standard PlayReady key system ID, here we will switch
// to the Chromecast version if we are running on that platform.
// Note that this must come after fillInDrmInfoDefaults_, since the
// player config uses the standard PlayReady ID for license server
// configuration.
if (window.cast && window.cast.__platform__) {
if (originalKeySystem == 'com.microsoft.playready') {
drmInfo.keySystem = 'com.chromecast.playready';
}
}
}
/**
* Parse pssh from a media segment and announce new initData
*
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @param {!BufferSource} mediaSegment
* @return {!Promise<void>}
*/
parseInbandPssh(contentType, mediaSegment) {
if (!this.config_.parseInbandPsshEnabled || this.manifestInitData_) {
return Promise.resolve();
}
const ContentType = shaka.util.ManifestParserUtils.ContentType;
if (![ContentType.AUDIO, ContentType.VIDEO].includes(contentType)) {
return Promise.resolve();
}
const pssh = new shaka.util.Pssh(
shaka.util.BufferUtils.toUint8(mediaSegment));
let totalLength = 0;
for (const data of pssh.data) {
totalLength += data.length;
}
if (totalLength == 0) {
return Promise.resolve();
}
const combinedData = new Uint8Array(totalLength);
let pos = 0;
for (const data of pssh.data) {
combinedData.set(data, pos);
pos += data.length;
}
this.newInitData('cenc', combinedData);
return this.allSessionsLoaded_;
}
};
/**
* @typedef {{
* loaded: boolean,
* initData: Uint8Array,
* initDataType: ?string,
* oldExpiration: number,
* type: string,
* updatePromise: shaka.util.PublicPromise
* }}
*
* @description A record to track sessions and suppress duplicate init data.
* @property {boolean} loaded
* True once the key status has been updated (to a non-pending state). This
* does not mean the session is 'usable'.
* @property {Uint8Array} initData
* The init data used to create the session.
* @property {?string} initDataType
* The init data type used to create the session.
* @property {!MediaKeySession} session
* The session object.
* @property {number} oldExpiration
* The expiration of the session on the last check. This is used to fire
* an event when it changes.
* @property {string} type
* The session type
* @property {shaka.util.PublicPromise} updatePromise
* An optional Promise that will be resolved/rejected on the next update()
* call. This is used to track the 'license-release' message when calling
* remove().
*/
shaka.media.DrmEngine.SessionMetaData;
/**
* @typedef {{
* netEngine: !shaka.net.NetworkingEngine,
* onError: function(!shaka.util.Error),
* onKeyStatus: function(!Object.<string,string>),
* onExpirationUpdated: function(string,number),
* onEvent: function(!Event)
* }}
*
* @property {shaka.net.NetworkingEngine} netEngine
* The NetworkingEngine instance to use. The caller retains ownership.
* @property {function(!shaka.util.Error)} onError
* Called when an error occurs. If the error is recoverable (see
* {@link shaka.util.Error}) then the caller may invoke either
* StreamingEngine.switch*() or StreamingEngine.seeked() to attempt recovery.
* @property {function(!Object.<string,string>)} onKeyStatus
* Called when key status changes. The argument is a map of hex key IDs to
* statuses.
* @property {function(string,number)} onExpirationUpdated
* Called when the session expiration value changes.
* @property {function(!Event)} onEvent
* Called when an event occurs that should be sent to the app.
*/
shaka.media.DrmEngine.PlayerInterface;
/**
* The amount of time, in seconds, we wait to consider a session closed.
* This allows us to work around Chrome bug https://crbug.com/1108158.
* @private {number}
*/
shaka.media.DrmEngine.CLOSE_TIMEOUT_ = 1;
/**
* The amount of time, in seconds, we wait to consider session loaded even if no
* key status information is available. This allows us to support browsers/CDMs
* without key statuses.
* @private {number}
*/
shaka.media.DrmEngine.SESSION_LOAD_TIMEOUT_ = 5;
/**
* The amount of time, in seconds, we wait to batch up rapid key status changes.
* This allows us to avoid multiple expiration events in most cases.
* @type {number}
*/
shaka.media.DrmEngine.KEY_STATUS_BATCH_TIME = 0.5;
/**
* Contains the suggested "default" key ID used by EME polyfills that do not
* have a per-key key status. See w3c/encrypted-media#32.
* @type {!shaka.util.Lazy.<!ArrayBuffer>}
*/
shaka.media.DrmEngine.DUMMY_KEY_ID = new shaka.util.Lazy(
() => shaka.util.BufferUtils.toArrayBuffer(new Uint8Array([0])));