mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-15 16:06:41 +03:00
Jacob Trimble
2399 lines
79 KiB
JavaScript
2399 lines
79 KiB
JavaScript
/**
|
|
* @license
|
|
* Copyright 2016 Google Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
|
|
goog.provide('shaka.hls.HlsParser');
|
|
|
|
goog.require('goog.Uri');
|
|
goog.require('goog.asserts');
|
|
goog.require('shaka.Deprecate');
|
|
goog.require('shaka.hls.ManifestTextParser');
|
|
goog.require('shaka.hls.Playlist');
|
|
goog.require('shaka.hls.PlaylistType');
|
|
goog.require('shaka.hls.Tag');
|
|
goog.require('shaka.hls.Utils');
|
|
goog.require('shaka.log');
|
|
goog.require('shaka.media.DrmEngine');
|
|
goog.require('shaka.media.InitSegmentReference');
|
|
goog.require('shaka.media.ManifestParser');
|
|
goog.require('shaka.media.PresentationTimeline');
|
|
goog.require('shaka.media.SegmentIndex');
|
|
goog.require('shaka.media.SegmentReference');
|
|
goog.require('shaka.net.DataUriPlugin');
|
|
goog.require('shaka.net.NetworkingEngine');
|
|
goog.require('shaka.text.TextEngine');
|
|
goog.require('shaka.util.ArrayUtils');
|
|
goog.require('shaka.util.DataViewReader');
|
|
goog.require('shaka.util.Error');
|
|
goog.require('shaka.util.Functional');
|
|
goog.require('shaka.util.Iterables');
|
|
goog.require('shaka.util.LanguageUtils');
|
|
goog.require('shaka.util.ManifestParserUtils');
|
|
goog.require('shaka.util.MimeUtils');
|
|
goog.require('shaka.util.Mp4Parser');
|
|
goog.require('shaka.util.Networking');
|
|
goog.require('shaka.util.OperationManager');
|
|
goog.require('shaka.util.Timer');
|
|
|
|
|
|
/**
|
|
* HLS parser.
|
|
*
|
|
* @implements {shaka.extern.ManifestParser}
|
|
* @export
|
|
*/
|
|
shaka.hls.HlsParser = class {
|
|
/**
|
|
* Creates an Hls Parser object.
|
|
*/
|
|
constructor() {
|
|
/** @private {?shaka.extern.ManifestParser.PlayerInterface} */
|
|
this.playerInterface_ = null;
|
|
|
|
/** @private {?shaka.extern.ManifestConfiguration} */
|
|
this.config_ = null;
|
|
|
|
/** @private {number} */
|
|
this.globalId_ = 1;
|
|
|
|
/**
|
|
* A map from group id to stream infos created from the media tags.
|
|
* @private {!Map.<string, !Array.<shaka.hls.HlsParser.StreamInfo>>}
|
|
*/
|
|
this.groupIdToStreamInfosMap_ = new Map();
|
|
|
|
/**
|
|
* The values are strings of the form "<VIDEO URI> - <AUDIO URI>",
|
|
* where the URIs are the verbatim media playlist URIs as they appeared in
|
|
* the master playlist.
|
|
*
|
|
* Used to avoid duplicates that vary only in their text stream.
|
|
*
|
|
* @private {!Set.<string>}
|
|
*/
|
|
this.variantUriSet_ = new Set();
|
|
|
|
/**
|
|
* A map from (verbatim) media playlist URI to stream infos representing the
|
|
* playlists.
|
|
*
|
|
* On update, used to iterate through and update from media playlists.
|
|
*
|
|
* On initial parse, used to iterate through and determine minimum
|
|
* timestamps, offsets, and to handle TS rollover.
|
|
*
|
|
* During parsing, used to avoid duplicates in the async methods
|
|
* createStreamInfoFromMediaTag_ and createStreamInfoFromVariantTag_.
|
|
*
|
|
* During parsing of updates, used by getStartTime_ to determine the start
|
|
* time of the first segment from existing segment references.
|
|
*
|
|
* @private {!Map.<string, shaka.hls.HlsParser.StreamInfo>}
|
|
*/
|
|
this.uriToStreamInfosMap_ = new Map();
|
|
|
|
/** @private {?shaka.media.PresentationTimeline} */
|
|
this.presentationTimeline_ = null;
|
|
|
|
/**
|
|
* The master playlist URI, after redirects.
|
|
*
|
|
* @private {string}
|
|
*/
|
|
this.masterPlaylistUri_ = '';
|
|
|
|
/** @private {shaka.hls.ManifestTextParser} */
|
|
this.manifestTextParser_ = new shaka.hls.ManifestTextParser();
|
|
|
|
/**
|
|
* This is the number of seconds we want to wait between finishing a
|
|
* manifest update and starting the next one. This will be set when we parse
|
|
* the manifest.
|
|
*
|
|
* @private {number}
|
|
*/
|
|
this.updatePlaylistDelay_ = 0;
|
|
|
|
/**
|
|
* This timer is used to trigger the start of a manifest update. A manifest
|
|
* update is async. Once the update is finished, the timer will be restarted
|
|
* to trigger the next update. The timer will only be started if the content
|
|
* is live content.
|
|
*
|
|
* @private {shaka.util.Timer}
|
|
*/
|
|
this.updatePlaylistTimer_ = new shaka.util.Timer(() => {
|
|
this.onUpdate_();
|
|
});
|
|
|
|
/** @private {shaka.hls.HlsParser.PresentationType_} */
|
|
this.presentationType_ = shaka.hls.HlsParser.PresentationType_.VOD;
|
|
|
|
/** @private {?shaka.extern.Manifest} */
|
|
this.manifest_ = null;
|
|
|
|
/** @private {number} */
|
|
this.maxTargetDuration_ = 0;
|
|
|
|
/** @private {number} */
|
|
this.minTargetDuration_ = Infinity;
|
|
|
|
/** @private {shaka.util.OperationManager} */
|
|
this.operationManager_ = new shaka.util.OperationManager();
|
|
|
|
/** @private {!Array.<!Array.<!shaka.media.SegmentReference>>} */
|
|
this.segmentsToNotifyByStream_ = [];
|
|
|
|
/** A map from closed captions' group id, to a map of closed captions info.
|
|
* {group id -> {closed captions channel id -> language}}
|
|
* @private {Map.<string, Map.<string, string>>}
|
|
*/
|
|
this.groupIdToClosedCaptionsMap_ = new Map();
|
|
|
|
/** True if some of the variants in the playlist is encrypted with AES-128.
|
|
* @private {boolean} */
|
|
this.aesEncrypted_ = false;
|
|
|
|
/** @type {Map.<string, string>} */
|
|
this.groupIdToCodecsMap_ = new Map();
|
|
}
|
|
|
|
/**
|
|
* @override
|
|
* @exportInterface
|
|
*/
|
|
configure(config) {
|
|
this.config_ = config;
|
|
}
|
|
|
|
/**
|
|
* @override
|
|
* @exportInterface
|
|
*/
|
|
async start(uri, playerInterface) {
|
|
goog.asserts.assert(this.config_, 'Must call configure() before start()!');
|
|
this.playerInterface_ = playerInterface;
|
|
|
|
const response = await this.requestManifest_(uri);
|
|
|
|
// Record the master playlist URI after redirects.
|
|
this.masterPlaylistUri_ = response.uri;
|
|
|
|
goog.asserts.assert(response.data, 'Response data should be non-null!');
|
|
await this.parseManifest_(response.data);
|
|
|
|
// Start the update timer if we want updates.
|
|
const delay = this.updatePlaylistDelay_;
|
|
if (delay > 0) {
|
|
this.updatePlaylistTimer_.tickAfter(/* seconds = */ delay);
|
|
}
|
|
|
|
goog.asserts.assert(this.manifest_, 'Manifest should be non-null');
|
|
return this.manifest_;
|
|
}
|
|
|
|
/**
|
|
* @override
|
|
* @exportInterface
|
|
*/
|
|
stop() {
|
|
// Make sure we don't update the manifest again. Even if the timer is not
|
|
// running, this is safe to call.
|
|
if (this.updatePlaylistTimer_) {
|
|
this.updatePlaylistTimer_.stop();
|
|
this.updatePlaylistTimer_ = null;
|
|
}
|
|
|
|
/** @type {!Array.<!Promise>} */
|
|
const pending = [];
|
|
|
|
if (this.operationManager_) {
|
|
pending.push(this.operationManager_.destroy());
|
|
this.operationManager_ = null;
|
|
}
|
|
|
|
this.playerInterface_ = null;
|
|
this.config_ = null;
|
|
this.variantUriSet_.clear();
|
|
this.manifest_ = null;
|
|
this.uriToStreamInfosMap_.clear();
|
|
this.groupIdToStreamInfosMap_.clear();
|
|
this.groupIdToCodecsMap_.clear();
|
|
|
|
return Promise.all(pending);
|
|
}
|
|
|
|
/**
|
|
* @override
|
|
* @exportInterface
|
|
*/
|
|
update() {
|
|
if (!this.isLive_()) {
|
|
return Promise.resolve();
|
|
}
|
|
|
|
/** @type {!Array.<!Promise>} */
|
|
const updates = [];
|
|
|
|
for (const streamInfo of this.uriToStreamInfosMap_.values()) {
|
|
updates.push(this.updateStream_(streamInfo));
|
|
}
|
|
|
|
return Promise.all(updates);
|
|
}
|
|
|
|
/**
|
|
* Updates a stream.
|
|
*
|
|
* @param {!shaka.hls.HlsParser.StreamInfo} streamInfo
|
|
* @return {!Promise}
|
|
* @throws shaka.util.Error
|
|
* @private
|
|
*/
|
|
async updateStream_(streamInfo) {
|
|
const PresentationType = shaka.hls.HlsParser.PresentationType_;
|
|
|
|
const manifestUri = streamInfo.absoluteMediaPlaylistUri;
|
|
const response = await this.requestManifest_(manifestUri);
|
|
|
|
/** @type {shaka.hls.Playlist} */
|
|
const playlist = this.manifestTextParser_.parsePlaylist(
|
|
response.data, response.uri);
|
|
|
|
if (playlist.type != shaka.hls.PlaylistType.MEDIA) {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.HLS_INVALID_PLAYLIST_HIERARCHY);
|
|
}
|
|
|
|
const mediaSequenceTag = shaka.hls.Utils.getFirstTagWithName(
|
|
playlist.tags, 'EXT-X-MEDIA-SEQUENCE');
|
|
|
|
const startPosition = mediaSequenceTag ? Number(mediaSequenceTag.value) : 0;
|
|
const stream = streamInfo.stream;
|
|
|
|
const segments = await this.createSegments_(
|
|
streamInfo.verbatimMediaPlaylistUri,
|
|
playlist,
|
|
startPosition,
|
|
stream.mimeType,
|
|
stream.codecs);
|
|
|
|
stream.segmentIndex.replace(segments);
|
|
|
|
const newestSegment = segments[segments.length - 1];
|
|
goog.asserts.assert(newestSegment, 'Should have segments!');
|
|
|
|
// Once the last segment has been added to the playlist,
|
|
// #EXT-X-ENDLIST tag will be appended.
|
|
// If that happened, treat the rest of the EVENT presentation as VOD.
|
|
const endListTag =
|
|
shaka.hls.Utils.getFirstTagWithName(playlist.tags, 'EXT-X-ENDLIST');
|
|
|
|
if (endListTag) {
|
|
// Convert the presentation to VOD and set the duration to the last
|
|
// segment's end time.
|
|
this.setPresentationType_(PresentationType.VOD);
|
|
this.presentationTimeline_.setDuration(newestSegment.endTime);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* @override
|
|
* @exportInterface
|
|
*/
|
|
onExpirationUpdated(sessionId, expiration) {
|
|
// No-op
|
|
}
|
|
|
|
/**
|
|
* Parses the manifest.
|
|
*
|
|
* @param {!ArrayBuffer} data
|
|
* @throws shaka.util.Error When there is a parsing error.
|
|
* @return {!Promise}
|
|
* @private
|
|
*/
|
|
async parseManifest_(data) {
|
|
goog.asserts.assert(this.masterPlaylistUri_,
|
|
'Master playlist URI must be set before calling parseManifest_!');
|
|
|
|
const playlist = this.manifestTextParser_.parsePlaylist(
|
|
data, this.masterPlaylistUri_);
|
|
|
|
// We don't support directly providing a Media Playlist.
|
|
// See the error code for details.
|
|
if (playlist.type != shaka.hls.PlaylistType.MASTER) {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.HLS_MASTER_PLAYLIST_NOT_PROVIDED);
|
|
}
|
|
|
|
const period = await this.createPeriod_(playlist.tags);
|
|
|
|
// Make sure that the parser has not been destroyed.
|
|
if (!this.playerInterface_) {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.PLAYER,
|
|
shaka.util.Error.Code.OPERATION_ABORTED);
|
|
}
|
|
|
|
if (this.aesEncrypted_ && period.variants.length == 0) {
|
|
// We do not support AES-128 encryption with HLS yet. Variants is null
|
|
// when the playlist is encrypted with AES-128.
|
|
shaka.log.info('No stream is created, because we don\'t support AES-128',
|
|
'encryption yet');
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.HLS_AES_128_ENCRYPTION_NOT_SUPPORTED);
|
|
}
|
|
|
|
// HLS has no notion of periods. We're treating the whole presentation as
|
|
// one period.
|
|
this.playerInterface_.filterAllPeriods([period]);
|
|
|
|
// Find the min and max timestamp of the earliest segment in all streams.
|
|
// Find the minimum duration of all streams as well.
|
|
let minFirstTimestamp = Infinity;
|
|
let maxFirstTimestamp = 0;
|
|
let maxLastTimestamp = 0;
|
|
let minDuration = Infinity;
|
|
|
|
for (const streamInfo of this.uriToStreamInfosMap_.values()) {
|
|
minFirstTimestamp =
|
|
Math.min(minFirstTimestamp, streamInfo.minTimestamp);
|
|
maxFirstTimestamp =
|
|
Math.max(maxFirstTimestamp, streamInfo.minTimestamp);
|
|
maxLastTimestamp =
|
|
Math.max(maxLastTimestamp, streamInfo.maxTimestamp);
|
|
if (streamInfo.stream.type != 'text') {
|
|
minDuration = Math.min(minDuration,
|
|
streamInfo.maxTimestamp - streamInfo.minTimestamp);
|
|
}
|
|
}
|
|
|
|
// This assert is our own sanity check.
|
|
goog.asserts.assert(this.presentationTimeline_ == null,
|
|
'Presentation timeline created early!');
|
|
this.createPresentationTimeline_(maxLastTimestamp);
|
|
|
|
// This assert satisfies the compiler that it is not null for the rest of
|
|
// the method.
|
|
goog.asserts.assert(this.presentationTimeline_,
|
|
'Presentation timeline not created!');
|
|
|
|
if (this.isLive_()) {
|
|
// The HLS spec (RFC 8216) states in 6.3.4:
|
|
// "the client MUST wait for at least the target duration before
|
|
// attempting to reload the Playlist file again"
|
|
this.updatePlaylistDelay_ = this.minTargetDuration_;
|
|
|
|
// The spec says nothing much about seeking in live content, but Safari's
|
|
// built-in HLS implementation does not allow it. Therefore we will set
|
|
// the availability window equal to the presentation delay. The player
|
|
// will be able to buffer ahead three segments, but the seek window will
|
|
// be zero-sized.
|
|
const PresentationType = shaka.hls.HlsParser.PresentationType_;
|
|
|
|
if (this.presentationType_ == PresentationType.LIVE) {
|
|
// This defaults to the presentation delay, which has the effect of
|
|
// making the live stream unseekable. This is consistent with Apple's
|
|
// HLS implementation.
|
|
let segmentAvailabilityDuration = this.presentationTimeline_.getDelay();
|
|
|
|
// The app can override that with a longer duration, to allow seeking.
|
|
if (!isNaN(this.config_.availabilityWindowOverride)) {
|
|
segmentAvailabilityDuration = this.config_.availabilityWindowOverride;
|
|
}
|
|
|
|
this.presentationTimeline_.setSegmentAvailabilityDuration(
|
|
segmentAvailabilityDuration);
|
|
}
|
|
|
|
const rolloverSeconds =
|
|
shaka.hls.HlsParser.TS_ROLLOVER_ / shaka.hls.HlsParser.TS_TIMESCALE_;
|
|
let offset = 0;
|
|
while (maxFirstTimestamp >= rolloverSeconds) {
|
|
offset += rolloverSeconds;
|
|
maxFirstTimestamp -= rolloverSeconds;
|
|
}
|
|
if (offset) {
|
|
shaka.log.debug('Offsetting live streams by', offset,
|
|
'to compensate for rollover');
|
|
|
|
for (const streamInfo of this.uriToStreamInfosMap_.values()) {
|
|
if (streamInfo.minTimestamp < rolloverSeconds) {
|
|
shaka.log.v1('Offset applied to', streamInfo.stream.type);
|
|
// The segments were created with actual media times, rather than
|
|
// period-aligned times, so offset them all to period time.
|
|
streamInfo.stream.segmentIndex.offset(offset);
|
|
} else {
|
|
shaka.log.v1('Offset NOT applied to', streamInfo.stream.type);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
// For VOD/EVENT content, offset everything back to 0.
|
|
// Use the minimum timestamp as the offset for all streams.
|
|
// Use the minimum duration as the presentation duration.
|
|
this.presentationTimeline_.setDuration(minDuration);
|
|
// Use a negative offset to adjust towards 0.
|
|
this.presentationTimeline_.offset(-minFirstTimestamp);
|
|
|
|
for (const streamInfo of this.uriToStreamInfosMap_.values()) {
|
|
// The segments were created with actual media times, rather than
|
|
// period-aligned times, so offset them all now.
|
|
streamInfo.stream.segmentIndex.offset(-minFirstTimestamp);
|
|
// Finally, fit the segments to the period duration.
|
|
streamInfo.stream.segmentIndex.fit(minDuration);
|
|
}
|
|
}
|
|
|
|
this.manifest_ = {
|
|
presentationTimeline: this.presentationTimeline_,
|
|
periods: [period],
|
|
offlineSessionIds: [],
|
|
minBufferTime: 0,
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Parses the playlist tags and creates a Period object.
|
|
*
|
|
* @param {!Array.<!shaka.hls.Tag>} tags All tags from the playlist.
|
|
* @return {!Promise.<!shaka.extern.Period>}
|
|
* @private
|
|
*/
|
|
async createPeriod_(tags) {
|
|
const Utils = shaka.hls.Utils;
|
|
/** @type {!Array.<!shaka.hls.Tag>} */
|
|
const mediaTags = Utils.filterTagsByName(tags, 'EXT-X-MEDIA');
|
|
/** @type {!Array.<!shaka.hls.Tag>} */
|
|
const variantTags = Utils.filterTagsByName(tags, 'EXT-X-STREAM-INF');
|
|
|
|
this.parseCodecs_(variantTags);
|
|
const textStreams = await this.parseTexts_(mediaTags);
|
|
await this.createStreamInfosFromMediaTags_(mediaTags);
|
|
const variants = await this.createVariantsForTags_(variantTags);
|
|
|
|
return {
|
|
startTime: 0,
|
|
variants: variants,
|
|
textStreams: textStreams,
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Get the codecs of each variant tag, and store in a map from
|
|
* audio/video/subtitle group id to the codecs arraylist.
|
|
* @param {!Array.<!shaka.hls.Tag>} tags Variant tags from the playlist.
|
|
* @private
|
|
*/
|
|
parseCodecs_(tags) {
|
|
const ContentType = shaka.util.ManifestParserUtils.ContentType;
|
|
|
|
for (const variantTag of tags) {
|
|
const audioGroupId = variantTag.getAttributeValue('AUDIO');
|
|
const videoGroupId = variantTag.getAttributeValue('VIDEO');
|
|
const subGroupId = variantTag.getAttributeValue('SUBTITLES');
|
|
const allCodecs = this.getCodecsForVariantTag_(variantTag);
|
|
|
|
if (subGroupId) {
|
|
const textCodecs = this.guessCodecsSafe_(ContentType.TEXT, allCodecs);
|
|
goog.asserts.assert(textCodecs != null, 'Text codecs should be valid.');
|
|
this.groupIdToCodecsMap_.set(subGroupId, textCodecs);
|
|
shaka.util.ArrayUtils.remove(allCodecs, textCodecs);
|
|
}
|
|
if (audioGroupId) {
|
|
const codecs = this.guessCodecs_(ContentType.AUDIO, allCodecs);
|
|
this.groupIdToCodecsMap_.set(audioGroupId, codecs);
|
|
}
|
|
if (videoGroupId) {
|
|
const codecs = this.guessCodecs_(ContentType.VIDEO, allCodecs);
|
|
this.groupIdToCodecsMap_.set(videoGroupId, codecs);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Parse Subtitles and Closed Captions from 'EXT-X-MEDIA' tags.
|
|
* Create text streams for Subtitles, but not Closed Captions.
|
|
*
|
|
* @param {!Array.<!shaka.hls.Tag>} mediaTags Media tags from the playlist.
|
|
* @return {!Promise.<!Array.<!shaka.extern.Stream>>}
|
|
* @private
|
|
*/
|
|
async parseTexts_(mediaTags) {
|
|
// Create text stream for each Subtitle media tag.
|
|
const subtitleTags =
|
|
shaka.hls.Utils.filterTagsByType(mediaTags, 'SUBTITLES');
|
|
const textStreamPromises = subtitleTags.map(async (tag) => {
|
|
try {
|
|
const streamInfo = await this.createStreamInfoFromMediaTag_(tag);
|
|
goog.asserts.assert(
|
|
streamInfo, 'Should always have a streamInfo for text');
|
|
return streamInfo.stream;
|
|
} catch (e) {
|
|
if (this.config_.hls.ignoreTextStreamFailures) {
|
|
return null;
|
|
}
|
|
throw e;
|
|
}
|
|
});
|
|
const textStreams = await Promise.all(textStreamPromises);
|
|
|
|
// Set the codecs for text streams.
|
|
for (const tag of subtitleTags) {
|
|
const groupId = tag.getRequiredAttrValue('GROUP-ID');
|
|
const codecs = this.groupIdToCodecsMap_.get(groupId);
|
|
if (codecs) {
|
|
const textStreamInfos = this.groupIdToStreamInfosMap_.get(groupId);
|
|
if (textStreamInfos) {
|
|
for (const textStreamInfo of textStreamInfos) {
|
|
textStreamInfo.stream.codecs = codecs;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Do not create text streams for Closed captions.
|
|
this.parseClosedCaptions_(mediaTags);
|
|
return textStreams.filter((s) => s);
|
|
}
|
|
|
|
/**
|
|
* @param {!Array.<!shaka.hls.Tag>} mediaTags Media tags from the playlist.
|
|
* @private
|
|
*/
|
|
async createStreamInfosFromMediaTags_(mediaTags) {
|
|
// Filter out subtitles and media tags without uri.
|
|
mediaTags = mediaTags.filter((tag) => {
|
|
const uri = tag.getAttributeValue('URI') || '';
|
|
const type = tag.getAttributeValue('TYPE');
|
|
return type != 'SUBTITLES' && uri != '';
|
|
});
|
|
|
|
// Create stream info for each audio / video media tag.
|
|
const promises = mediaTags.map((tag) => {
|
|
return this.createStreamInfoFromMediaTag_(tag);
|
|
});
|
|
await Promise.all(promises);
|
|
}
|
|
|
|
/**
|
|
* @param {!Array.<!shaka.hls.Tag>} tags Variant tags from the playlist.
|
|
* @return {!Promise.<!Array.<!shaka.extern.Variant>>}
|
|
* @private
|
|
*/
|
|
async createVariantsForTags_(tags) {
|
|
// Create variants for each variant tag.
|
|
const variantsPromises = tags.map(async (tag) => {
|
|
const frameRate = tag.getAttributeValue('FRAME-RATE');
|
|
const bandwidth = Number(tag.getRequiredAttrValue('BANDWIDTH'));
|
|
|
|
const resolution = tag.getAttributeValue('RESOLUTION');
|
|
const [width, height] = resolution ? resolution.split('x') : [null, null];
|
|
|
|
const streamInfos = await this.createStreamInfosForVariantTag_(tag,
|
|
resolution, frameRate);
|
|
|
|
if (streamInfos) {
|
|
goog.asserts.assert(streamInfos.audio.length ||
|
|
streamInfos.video.length, 'We should have created a stream!');
|
|
|
|
return this.createVariants_(
|
|
streamInfos.audio,
|
|
streamInfos.video,
|
|
bandwidth,
|
|
width,
|
|
height,
|
|
frameRate);
|
|
}
|
|
// We do not support AES-128 encryption with HLS yet. If the streamInfos
|
|
// is null because of AES-128 encryption, do not create variants for that.
|
|
return [];
|
|
});
|
|
|
|
const allVariants = await Promise.all(variantsPromises);
|
|
let variants = allVariants.reduce(shaka.util.Functional.collapseArrays, []);
|
|
// Filter out null variants.
|
|
variants = variants.filter((variant) => variant != null);
|
|
return variants;
|
|
}
|
|
|
|
/**
|
|
* Create audio and video streamInfos from an 'EXT-X-STREAM-INF' tag and its
|
|
* related media tags.
|
|
*
|
|
* @param {!shaka.hls.Tag} tag
|
|
* @param {?string} resolution
|
|
* @param {?string} frameRate
|
|
* @return {!Promise.<?shaka.hls.HlsParser.StreamInfos>}
|
|
* @private
|
|
*/
|
|
async createStreamInfosForVariantTag_(tag, resolution, frameRate) {
|
|
const ContentType = shaka.util.ManifestParserUtils.ContentType;
|
|
/** @type {!Array.<string>} */
|
|
let allCodecs = this.getCodecsForVariantTag_(tag);
|
|
const audioGroupId = tag.getAttributeValue('AUDIO');
|
|
const videoGroupId = tag.getAttributeValue('VIDEO');
|
|
goog.asserts.assert(audioGroupId == null || videoGroupId == null,
|
|
'Unexpected: both video and audio described by media tags!');
|
|
|
|
const groupId = audioGroupId || videoGroupId;
|
|
const streamInfos =
|
|
(groupId && this.groupIdToStreamInfosMap_.has(groupId)) ?
|
|
this.groupIdToStreamInfosMap_.get(groupId) : [];
|
|
|
|
/** @type {shaka.hls.HlsParser.StreamInfos} */
|
|
const res = {
|
|
audio: audioGroupId ? streamInfos : [],
|
|
video: videoGroupId ? streamInfos : [],
|
|
};
|
|
|
|
// Make an educated guess about the stream type.
|
|
shaka.log.debug('Guessing stream type for', tag.toString());
|
|
let type;
|
|
let ignoreStream = false;
|
|
|
|
// The Microsoft HLS manifest generators will make audio-only variants
|
|
// that link to their URI both directly and through an audio tag.
|
|
// In that case, ignore the local URI and use the version in the
|
|
// AUDIO tag, so you inherit its language.
|
|
// As an example, see the manifest linked in issue #860.
|
|
const streamURI = tag.getRequiredAttrValue('URI');
|
|
const firstAudioStreamURI =
|
|
res.audio.length ? res.audio[0].verbatimMediaPlaylistUri : '';
|
|
const areSameUri = streamURI == firstAudioStreamURI;
|
|
|
|
const videoCodecs = this.guessCodecsSafe_(ContentType.VIDEO, allCodecs);
|
|
const hasVideoRelatedInfo = resolution || frameRate || videoCodecs;
|
|
|
|
if (!streamInfos.length && allCodecs.length == 1 && !hasVideoRelatedInfo) {
|
|
// There are no associated media tags, and there's only one codec, and no
|
|
// video related information, so it should be audio.
|
|
type = ContentType.AUDIO;
|
|
} else if (!streamInfos.length && allCodecs.length > 1) {
|
|
// There are multiple codecs, so assume multiplexed content.
|
|
// Note that the default used when CODECS is missing assumes multiple
|
|
// (and therefore multiplexed).
|
|
// Recombine the codec strings into one so that MediaSource isn't
|
|
// lied to later. (That would trigger an error in Chrome.)
|
|
shaka.log.debug('Guessing multiplexed audio+video.');
|
|
type = ContentType.VIDEO;
|
|
allCodecs = [allCodecs.join(',')];
|
|
} else if (res.audio.length && areSameUri) {
|
|
shaka.log.debug('Guessing audio-only.');
|
|
type = ContentType.AUDIO;
|
|
ignoreStream = true;
|
|
} else if (res.video.length) {
|
|
// There are associated video streams. Assume this is audio.
|
|
shaka.log.debug('Guessing audio-only.');
|
|
type = ContentType.AUDIO;
|
|
} else {
|
|
shaka.log.debug('Guessing video-only.');
|
|
type = ContentType.VIDEO;
|
|
}
|
|
|
|
let streamInfo;
|
|
if (!ignoreStream) {
|
|
streamInfo =
|
|
await this.createStreamInfoFromVariantTag_(tag, allCodecs, type);
|
|
}
|
|
if (streamInfo) {
|
|
res[streamInfo.stream.type] = [streamInfo];
|
|
} else if (streamInfo === null) {
|
|
// Triple-equals for undefined.
|
|
shaka.log.debug('streamInfo is null');
|
|
return null;
|
|
}
|
|
this.filterLegacyCodecs_(res);
|
|
return res;
|
|
}
|
|
|
|
|
|
/**
|
|
* Get the codecs from the 'EXT-X-STREAM-INF' tag.
|
|
*
|
|
* @param {!shaka.hls.Tag} tag
|
|
* @return {!Array.<string>} codecs
|
|
* @private
|
|
*/
|
|
getCodecsForVariantTag_(tag) {
|
|
// These are the default codecs to assume if none are specified.
|
|
// The video codec is H.264, with baseline profile and level 3.0.
|
|
// http://blog.pearce.org.nz/2013/11/what-does-h264avc1-codecs-parameters.html
|
|
// The audio codec is "low-complexity" AAC.
|
|
const defaultCodecs = 'avc1.42E01E,mp4a.40.2';
|
|
|
|
const codecsString = tag.getAttributeValue('CODECS', defaultCodecs);
|
|
// Strip out internal whitespace while splitting on commas:
|
|
/** @type {!Array.<string>} */
|
|
const codecs = codecsString.split(/\s*,\s*/);
|
|
|
|
// Filter out duplicate codecs.
|
|
const seen = new Set();
|
|
const ret = [];
|
|
for (const codec of codecs) {
|
|
// HLS says the CODECS field needs to include all codecs that appear in
|
|
// the content. This means that if the content changes profiles, it should
|
|
// include both. Since all known browsers support changing profiles
|
|
// without any other work, just ignore them. See also:
|
|
// https://github.com/google/shaka-player/issues/1817
|
|
const shortCodec = shaka.util.MimeUtils.getCodecBase(codec);
|
|
if (!seen.has(shortCodec)) {
|
|
ret.push(codec);
|
|
seen.add(shortCodec);
|
|
} else {
|
|
shaka.log.debug('Ignoring duplicate codec');
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Get the channel count information for an HLS audio track.
|
|
* CHANNELS specifies an ordered, "/" separated list of parameters.
|
|
* If the type is audio, the first parameter will be a decimal integer
|
|
* specifying the number of independent, simultaneous audio channels.
|
|
* No other channels parameters are currently defined.
|
|
*
|
|
* @param {!shaka.hls.Tag} tag
|
|
* @return {?number}
|
|
* @private
|
|
*/
|
|
getChannelsCount_(tag) {
|
|
const channels = tag.getAttributeValue('CHANNELS');
|
|
if (!channels) {
|
|
return null;
|
|
}
|
|
const channelcountstring = channels.split('/')[0];
|
|
const count = parseInt(channelcountstring, 10);
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* Get the closed captions map information for the EXT-X-STREAM-INF tag, to
|
|
* create the stream info.
|
|
* @param {!shaka.hls.Tag} tag
|
|
* @param {string} type
|
|
* @return {Map.<string, string>} closedCaptions
|
|
* @private
|
|
*/
|
|
getClosedCaptions_(tag, type) {
|
|
const ContentType = shaka.util.ManifestParserUtils.ContentType;
|
|
// The attribute of closed captions is optional, and the value may be
|
|
// 'NONE'.
|
|
const closedCaptionsAttr = tag.getAttributeValue('CLOSED-CAPTIONS');
|
|
|
|
// EXT-X-STREAM-INF tags may have CLOSED-CAPTIONS attributes.
|
|
// The value can be either a quoted-string or an enumerated-string with
|
|
// the value NONE. If the value is a quoted-string, it MUST match the
|
|
// value of the GROUP-ID attribute of an EXT-X-MEDIA tag elsewhere in the
|
|
// Playlist whose TYPE attribute is CLOSED-CAPTIONS.
|
|
if (type == ContentType.VIDEO && closedCaptionsAttr &&
|
|
closedCaptionsAttr != 'NONE') {
|
|
return this.groupIdToClosedCaptionsMap_.get(closedCaptionsAttr);
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Get the language value.
|
|
*
|
|
* @param {!shaka.hls.Tag} tag
|
|
* @return {string}
|
|
* @private
|
|
*/
|
|
getLanguage_(tag) {
|
|
const LanguageUtils = shaka.util.LanguageUtils;
|
|
const languageValue = tag.getAttributeValue('LANGUAGE') || 'und';
|
|
return LanguageUtils.normalize(languageValue);
|
|
}
|
|
|
|
/**
|
|
* Get the type value.
|
|
* Shaka recognizes the content types 'audio', 'video' and 'text'.
|
|
* The HLS 'subtitles' type needs to be mapped to 'text'.
|
|
* @param {!shaka.hls.Tag} tag
|
|
* @return {string}
|
|
* @private
|
|
*/
|
|
getType_(tag) {
|
|
let type = tag.getRequiredAttrValue('TYPE').toLowerCase();
|
|
if (type == 'subtitles') {
|
|
type = shaka.util.ManifestParserUtils.ContentType.TEXT;
|
|
}
|
|
return type;
|
|
}
|
|
|
|
/**
|
|
* Filters out unsupported codec strings from an array of stream infos.
|
|
* @param {shaka.hls.HlsParser.StreamInfos} streamInfos
|
|
* @private
|
|
*/
|
|
filterLegacyCodecs_(streamInfos) {
|
|
for (const streamInfo of streamInfos.audio.concat(streamInfos.video)) {
|
|
let codecs = streamInfo.stream.codecs.split(',');
|
|
codecs = codecs.filter((codec) => {
|
|
// mp4a.40.34 is a nonstandard codec string that is sometimes used in
|
|
// HLS for legacy reasons. It is not recognized by non-Apple MSE.
|
|
// See https://bugs.chromium.org/p/chromium/issues/detail?id=489520
|
|
// Therefore, ignore this codec string.
|
|
return codec != 'mp4a.40.34';
|
|
});
|
|
streamInfo.stream.codecs = codecs.join(',');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {!Array.<!shaka.hls.HlsParser.StreamInfo>} audioInfos
|
|
* @param {!Array.<!shaka.hls.HlsParser.StreamInfo>} videoInfos
|
|
* @param {number} bandwidth
|
|
* @param {?string} width
|
|
* @param {?string} height
|
|
* @param {?string} frameRate
|
|
* @return {!Array.<!shaka.extern.Variant>}
|
|
* @private
|
|
*/
|
|
createVariants_(audioInfos, videoInfos, bandwidth, width, height, frameRate) {
|
|
const ContentType = shaka.util.ManifestParserUtils.ContentType;
|
|
const DrmEngine = shaka.media.DrmEngine;
|
|
|
|
for (const info of videoInfos) {
|
|
this.addVideoAttributes_(info.stream, width, height, frameRate);
|
|
}
|
|
|
|
// In case of audio-only or video-only content, we create an array of
|
|
// one item containing a null. This way, the double-loop works for all
|
|
// kinds of content.
|
|
// NOTE: we currently don't have support for audio-only content.
|
|
if (!audioInfos.length) {
|
|
audioInfos = [null];
|
|
}
|
|
if (!videoInfos.length) {
|
|
videoInfos = [null];
|
|
}
|
|
|
|
const variants = [];
|
|
for (const audioInfo of audioInfos) {
|
|
for (const videoInfo of videoInfos) {
|
|
const audioStream = audioInfo ? audioInfo.stream : null;
|
|
const videoStream = videoInfo ? videoInfo.stream : null;
|
|
const audioDrmInfos = audioInfo ? audioInfo.drmInfos : null;
|
|
const videoDrmInfos = videoInfo ? videoInfo.drmInfos : null;
|
|
const videoStreamUri =
|
|
videoInfo ? videoInfo.verbatimMediaPlaylistUri : '';
|
|
const audioStreamUri =
|
|
audioInfo ? audioInfo.verbatimMediaPlaylistUri : '';
|
|
const variantUriKey = videoStreamUri + ' - ' + audioStreamUri;
|
|
|
|
let drmInfos;
|
|
if (audioStream && videoStream) {
|
|
if (DrmEngine.areDrmCompatible(audioDrmInfos, videoDrmInfos)) {
|
|
drmInfos =
|
|
DrmEngine.getCommonDrmInfos(audioDrmInfos, videoDrmInfos);
|
|
} else {
|
|
shaka.log.warning(
|
|
'Incompatible DRM info in HLS variant. Skipping.');
|
|
continue;
|
|
}
|
|
} else if (audioStream) {
|
|
drmInfos = audioDrmInfos;
|
|
} else if (videoStream) {
|
|
drmInfos = videoDrmInfos;
|
|
}
|
|
|
|
if (this.variantUriSet_.has(variantUriKey)) {
|
|
// This happens when two variants only differ in their text streams.
|
|
shaka.log.debug(
|
|
'Skipping variant which only differs in text streams.');
|
|
continue;
|
|
}
|
|
|
|
// Since both audio and video are of the same type, this assertion will
|
|
// catch certain mistakes at runtime that the compiler would miss.
|
|
goog.asserts.assert(!audioStream ||
|
|
audioStream.type == ContentType.AUDIO, 'Audio parameter mismatch!');
|
|
goog.asserts.assert(!videoStream ||
|
|
videoStream.type == ContentType.VIDEO, 'Video parameter mismatch!');
|
|
|
|
const variant = {
|
|
id: this.globalId_++,
|
|
language: audioStream ? audioStream.language : 'und',
|
|
primary: (!!audioStream && audioStream.primary) ||
|
|
(!!videoStream && videoStream.primary),
|
|
audio: audioStream,
|
|
video: videoStream,
|
|
bandwidth: bandwidth,
|
|
drmInfos: drmInfos,
|
|
allowedByApplication: true,
|
|
allowedByKeySystem: true,
|
|
};
|
|
|
|
variants.push(variant);
|
|
this.variantUriSet_.add(variantUriKey);
|
|
}
|
|
}
|
|
return variants;
|
|
}
|
|
|
|
/**
|
|
* Parses an array of EXT-X-MEDIA tags, then stores the values of all tags
|
|
* with TYPE="CLOSED-CAPTIONS" into a map of group id to closed captions.
|
|
*
|
|
* @param {!Array.<!shaka.hls.Tag>} mediaTags
|
|
* @private
|
|
*/
|
|
parseClosedCaptions_(mediaTags) {
|
|
const closedCaptionsTags =
|
|
shaka.hls.Utils.filterTagsByType(mediaTags, 'CLOSED-CAPTIONS');
|
|
for (const tag of closedCaptionsTags) {
|
|
goog.asserts.assert(tag.name == 'EXT-X-MEDIA',
|
|
'Should only be called on media tags!');
|
|
const language = this.getLanguage_(tag);
|
|
|
|
// The GROUP-ID value is a quoted-string that specifies the group to which
|
|
// the Rendition belongs.
|
|
const groupId = tag.getRequiredAttrValue('GROUP-ID');
|
|
|
|
// The value of INSTREAM-ID is a quoted-string that specifies a Rendition
|
|
// within the segments in the Media Playlist. This attribute is REQUIRED
|
|
// if the TYPE attribute is CLOSED-CAPTIONS.
|
|
const instreamId = tag.getRequiredAttrValue('INSTREAM-ID');
|
|
if (!this.groupIdToClosedCaptionsMap_.get(groupId)) {
|
|
this.groupIdToClosedCaptionsMap_.set(groupId, new Map());
|
|
}
|
|
this.groupIdToClosedCaptionsMap_.get(groupId).set(instreamId, language);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Parse EXT-X-MEDIA media tag into a Stream object.
|
|
*
|
|
* @param {shaka.hls.Tag} tag
|
|
* @return {!Promise.<?shaka.hls.HlsParser.StreamInfo>}
|
|
* @private
|
|
*/
|
|
async createStreamInfoFromMediaTag_(tag) {
|
|
goog.asserts.assert(tag.name == 'EXT-X-MEDIA',
|
|
'Should only be called on media tags!');
|
|
const groupId = tag.getRequiredAttrValue('GROUP-ID');
|
|
let codecs = '';
|
|
/** @type {string} */
|
|
const type = this.getType_(tag);
|
|
// Text does not require a codec.
|
|
if (type != shaka.util.ManifestParserUtils.ContentType.TEXT && groupId &&
|
|
this.groupIdToCodecsMap_.has(groupId)) {
|
|
codecs = this.groupIdToCodecsMap_.get(groupId);
|
|
}
|
|
|
|
const verbatimMediaPlaylistUri = tag.getRequiredAttrValue('URI');
|
|
|
|
// Check if the stream has already been created as part of another Variant
|
|
// and return it if it has.
|
|
if (this.uriToStreamInfosMap_.has(verbatimMediaPlaylistUri)) {
|
|
return this.uriToStreamInfosMap_.get(verbatimMediaPlaylistUri);
|
|
}
|
|
|
|
const language = this.getLanguage_(tag);
|
|
const name = tag.getAttributeValue('NAME');
|
|
const defaultAttr = tag.getAttribute('DEFAULT');
|
|
const autoselectAttr = tag.getAttribute('AUTOSELECT');
|
|
const primary = !!defaultAttr || !!autoselectAttr;
|
|
const channelsCount = type == 'audio' ? this.getChannelsCount_(tag) : null;
|
|
// TODO: Should we take into account some of the currently ignored
|
|
// attributes: FORCED, INSTREAM-ID, CHARACTERISTICS? Attribute
|
|
// descriptions: https://bit.ly/2lpjOhj
|
|
const streamInfo = await this.createStreamInfo_(
|
|
verbatimMediaPlaylistUri, codecs, type, language, primary, name,
|
|
channelsCount, /* closedCaptions */ null);
|
|
if (streamInfo == null) {
|
|
return null;
|
|
}
|
|
|
|
if (this.groupIdToStreamInfosMap_.has(groupId)) {
|
|
this.groupIdToStreamInfosMap_.get(groupId).push(streamInfo);
|
|
} else {
|
|
this.groupIdToStreamInfosMap_.set(groupId, [streamInfo]);
|
|
}
|
|
// TODO: This check is necessary because of the possibility of multiple
|
|
// calls to createStreamInfoFromMediaTag_ before either has resolved.
|
|
if (this.uriToStreamInfosMap_.has(verbatimMediaPlaylistUri)) {
|
|
return this.uriToStreamInfosMap_.get(verbatimMediaPlaylistUri);
|
|
}
|
|
this.uriToStreamInfosMap_.set(verbatimMediaPlaylistUri, streamInfo);
|
|
return streamInfo;
|
|
}
|
|
|
|
/**
|
|
* Parse an EXT-X-STREAM-INF media tag into a Stream object.
|
|
*
|
|
* @param {!shaka.hls.Tag} tag
|
|
* @param {!Array.<string>} allCodecs
|
|
* @param {string} type
|
|
* @return {!Promise.<?shaka.hls.HlsParser.StreamInfo>}
|
|
* @private
|
|
*/
|
|
async createStreamInfoFromVariantTag_(tag, allCodecs, type) {
|
|
goog.asserts.assert(tag.name == 'EXT-X-STREAM-INF',
|
|
'Should only be called on variant tags!');
|
|
const verbatimMediaPlaylistUri = tag.getRequiredAttrValue('URI');
|
|
|
|
if (this.uriToStreamInfosMap_.has(verbatimMediaPlaylistUri)) {
|
|
return this.uriToStreamInfosMap_.get(verbatimMediaPlaylistUri);
|
|
}
|
|
|
|
const closedCaptions = this.getClosedCaptions_(tag, type);
|
|
const codecs = this.guessCodecs_(type, allCodecs);
|
|
const streamInfo = await this.createStreamInfo_(verbatimMediaPlaylistUri,
|
|
codecs, type, /* language */ 'und', /* primary */ false,
|
|
/* name */ null, /* channelcount */ null, closedCaptions);
|
|
if (streamInfo == null) {
|
|
return null;
|
|
}
|
|
// TODO: This check is necessary because of the possibility of multiple
|
|
// calls to createStreamInfoFromVariantTag_ before either has resolved.
|
|
if (this.uriToStreamInfosMap_.has(verbatimMediaPlaylistUri)) {
|
|
return this.uriToStreamInfosMap_.get(verbatimMediaPlaylistUri);
|
|
}
|
|
|
|
this.uriToStreamInfosMap_.set(verbatimMediaPlaylistUri, streamInfo);
|
|
return streamInfo;
|
|
}
|
|
|
|
|
|
/**
|
|
* @param {string} verbatimMediaPlaylistUri
|
|
* @param {string} codecs
|
|
* @param {string} type
|
|
* @param {string} language
|
|
* @param {boolean} primary
|
|
* @param {?string} name
|
|
* @param {?number} channelsCount
|
|
* @param {Map.<string, string>} closedCaptions
|
|
* @return {!Promise.<?shaka.hls.HlsParser.StreamInfo>}
|
|
* @throws shaka.util.Error
|
|
* @private
|
|
*/
|
|
async createStreamInfo_(verbatimMediaPlaylistUri, codecs, type, language,
|
|
primary, name, channelsCount, closedCaptions) {
|
|
// TODO: Refactor, too many parameters
|
|
let absoluteMediaPlaylistUri = shaka.hls.Utils.constructAbsoluteUri(
|
|
this.masterPlaylistUri_, verbatimMediaPlaylistUri);
|
|
|
|
const response = await this.requestManifest_(absoluteMediaPlaylistUri);
|
|
// Record the final URI after redirects.
|
|
absoluteMediaPlaylistUri = response.uri;
|
|
|
|
// Record the redirected, final URI of this media playlist when we parse it.
|
|
/** @type {!shaka.hls.Playlist} */
|
|
const playlist = this.manifestTextParser_.parsePlaylist(
|
|
response.data, absoluteMediaPlaylistUri);
|
|
|
|
if (playlist.type != shaka.hls.PlaylistType.MEDIA) {
|
|
// EXT-X-MEDIA tags should point to media playlists.
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.HLS_INVALID_PLAYLIST_HIERARCHY);
|
|
}
|
|
|
|
/** @type {!Array.<!shaka.hls.Tag>} */
|
|
const drmTags = [];
|
|
if (playlist.segments) {
|
|
for (const segment of playlist.segments) {
|
|
const segmentKeyTags = shaka.hls.Utils.filterTagsByName(segment.tags,
|
|
'EXT-X-KEY');
|
|
drmTags.push(...segmentKeyTags);
|
|
}
|
|
}
|
|
|
|
let encrypted = false;
|
|
/** @type {!Array.<shaka.extern.DrmInfo>}*/
|
|
const drmInfos = [];
|
|
let keyId = null;
|
|
|
|
// TODO: May still need changes to support key rotation.
|
|
for (const drmTag of drmTags) {
|
|
const method = drmTag.getRequiredAttrValue('METHOD');
|
|
if (method != 'NONE') {
|
|
encrypted = true;
|
|
|
|
// We do not support AES-128 encryption with HLS yet. So, do not create
|
|
// StreamInfo for the playlist encrypted with AES-128.
|
|
// TODO: Remove the error message once we add support for AES-128.
|
|
if (method == 'AES-128') {
|
|
shaka.log.warning('Unsupported HLS Encryption', method);
|
|
this.aesEncrypted_ = true;
|
|
return null;
|
|
}
|
|
|
|
const keyFormat =
|
|
drmTag.getRequiredAttrValue('KEYFORMAT');
|
|
const drmParser =
|
|
shaka.hls.HlsParser.KEYFORMATS_TO_DRM_PARSERS_[keyFormat];
|
|
|
|
const drmInfo = drmParser ? drmParser(drmTag) : null;
|
|
if (drmInfo) {
|
|
if (drmInfo.keyIds.length) {
|
|
keyId = drmInfo.keyIds[0];
|
|
}
|
|
drmInfos.push(drmInfo);
|
|
} else {
|
|
shaka.log.warning('Unsupported HLS KEYFORMAT', keyFormat);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (encrypted && !drmInfos.length) {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.HLS_KEYFORMATS_NOT_SUPPORTED);
|
|
}
|
|
|
|
|
|
goog.asserts.assert(playlist.segments != null,
|
|
'Media playlist should have segments!');
|
|
|
|
this.determinePresentationType_(playlist);
|
|
|
|
/** @type {string} */
|
|
const mimeType = await this.guessMimeType_(type, codecs, playlist);
|
|
|
|
const mediaSequenceTag = shaka.hls.Utils.getFirstTagWithName(playlist.tags,
|
|
'EXT-X-MEDIA-SEQUENCE');
|
|
|
|
const startPosition = mediaSequenceTag ? Number(mediaSequenceTag.value) : 0;
|
|
|
|
const segments = await this.createSegments_(
|
|
verbatimMediaPlaylistUri, playlist, startPosition, mimeType, codecs);
|
|
|
|
const minTimestamp = segments[0].startTime;
|
|
const lastEndTime = segments[segments.length - 1].endTime;
|
|
/** @type {!shaka.media.SegmentIndex} */
|
|
const segmentIndex = new shaka.media.SegmentIndex(segments);
|
|
|
|
const kind = (type == shaka.util.ManifestParserUtils.ContentType.TEXT) ?
|
|
shaka.util.ManifestParserUtils.TextStreamKind.SUBTITLE : undefined;
|
|
|
|
/** @type {shaka.extern.Stream} */
|
|
const stream = {
|
|
id: this.globalId_++,
|
|
originalId: name,
|
|
createSegmentIndex: () => Promise.resolve(),
|
|
segmentIndex: segmentIndex,
|
|
mimeType: mimeType,
|
|
codecs: codecs,
|
|
kind: kind,
|
|
encrypted: encrypted,
|
|
keyId: keyId,
|
|
language: language,
|
|
label: name, // For historical reasons, since before "originalId".
|
|
type: type,
|
|
primary: primary,
|
|
// TODO: trick mode
|
|
trickModeVideo: null,
|
|
emsgSchemeIdUris: null,
|
|
frameRate: undefined,
|
|
width: undefined,
|
|
height: undefined,
|
|
bandwidth: undefined,
|
|
roles: [],
|
|
channelsCount: channelsCount,
|
|
closedCaptions: closedCaptions,
|
|
};
|
|
|
|
return {
|
|
stream: stream,
|
|
drmInfos: drmInfos,
|
|
verbatimMediaPlaylistUri: verbatimMediaPlaylistUri,
|
|
absoluteMediaPlaylistUri: absoluteMediaPlaylistUri,
|
|
minTimestamp: minTimestamp,
|
|
maxTimestamp: lastEndTime,
|
|
};
|
|
}
|
|
|
|
|
|
/**
|
|
* @param {!shaka.hls.Playlist} playlist
|
|
* @private
|
|
*/
|
|
determinePresentationType_(playlist) {
|
|
const PresentationType = shaka.hls.HlsParser.PresentationType_;
|
|
const presentationTypeTag =
|
|
shaka.hls.Utils.getFirstTagWithName(playlist.tags,
|
|
'EXT-X-PLAYLIST-TYPE');
|
|
const endListTag =
|
|
shaka.hls.Utils.getFirstTagWithName(playlist.tags, 'EXT-X-ENDLIST');
|
|
|
|
const isVod = (presentationTypeTag && presentationTypeTag.value == 'VOD') ||
|
|
endListTag;
|
|
const isEvent = presentationTypeTag &&
|
|
presentationTypeTag.value == 'EVENT' && !isVod;
|
|
const isLive = !isVod && !isEvent;
|
|
|
|
if (isVod) {
|
|
this.setPresentationType_(PresentationType.VOD);
|
|
} else {
|
|
// If it's not VOD, it must be presentation type LIVE or an ongoing EVENT.
|
|
if (isLive) {
|
|
this.setPresentationType_(PresentationType.LIVE);
|
|
} else {
|
|
this.setPresentationType_(PresentationType.EVENT);
|
|
}
|
|
|
|
const targetDurationTag = this.getRequiredTag_(playlist.tags,
|
|
'EXT-X-TARGETDURATION');
|
|
const targetDuration = Number(targetDurationTag.value);
|
|
|
|
// According to the HLS spec, updates should not happen more often than
|
|
// once in targetDuration. It also requires us to only update the active
|
|
// variant. We might implement that later, but for now every variant
|
|
// will be updated. To get the update period, choose the smallest
|
|
// targetDuration value across all playlists.
|
|
|
|
// Update the longest target duration if need be to use as a presentation
|
|
// delay later.
|
|
this.maxTargetDuration_ = Math.max(
|
|
targetDuration, this.maxTargetDuration_);
|
|
// Update the shortest one to use as update period and segment
|
|
// availability time (for LIVE).
|
|
this.minTargetDuration_ = Math.min(
|
|
targetDuration, this.minTargetDuration_);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {number} lastTimestamp
|
|
* @throws shaka.util.Error
|
|
* @private
|
|
*/
|
|
createPresentationTimeline_(lastTimestamp) {
|
|
if (this.isLive_()) {
|
|
// The live edge will be calculated from segments, so we don't need to
|
|
// set a presentation start time. We will assert later that this is
|
|
// working as expected.
|
|
|
|
// The HLS spec (RFC 8216) states in 6.3.3:
|
|
//
|
|
// "The client SHALL choose which Media Segment to play first ... the
|
|
// client SHOULD NOT choose a segment that starts less than three target
|
|
// durations from the end of the Playlist file. Doing so can trigger
|
|
// playback stalls."
|
|
//
|
|
// We accomplish this in our DASH-y model by setting a presentation
|
|
// delay of 3 segments. This will be the "live edge" of the
|
|
// presentation.
|
|
this.presentationTimeline_ = new shaka.media.PresentationTimeline(
|
|
/* presentationStartTime */ 0, /* delay */ this.maxTargetDuration_ * 3);
|
|
this.presentationTimeline_.setStatic(false);
|
|
} else {
|
|
this.presentationTimeline_ = new shaka.media.PresentationTimeline(
|
|
/* presentationStartTime */ null, /* delay */ 0);
|
|
this.presentationTimeline_.setStatic(true);
|
|
}
|
|
|
|
this.notifySegments_();
|
|
|
|
// This asserts that the live edge is being calculated from segment times.
|
|
// For VOD and event streams, this check should still pass.
|
|
goog.asserts.assert(
|
|
!this.presentationTimeline_.usingPresentationStartTime(),
|
|
'We should not be using the presentation start time in HLS!');
|
|
}
|
|
|
|
|
|
/**
|
|
* @param {!shaka.hls.Playlist} playlist
|
|
* @return {shaka.media.InitSegmentReference}
|
|
* @private
|
|
* @throws {shaka.util.Error}
|
|
*/
|
|
createInitSegmentReference_(playlist) {
|
|
const mapTags =
|
|
shaka.hls.Utils.filterTagsByName(playlist.tags, 'EXT-X-MAP');
|
|
// TODO: Support multiple map tags?
|
|
// For now, we don't support multiple map tags and will throw an error.
|
|
if (!mapTags.length) {
|
|
return null;
|
|
} else if (mapTags.length > 1) {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.HLS_MULTIPLE_MEDIA_INIT_SECTIONS_FOUND);
|
|
}
|
|
|
|
// Map tag example: #EXT-X-MAP:URI="main.mp4",BYTERANGE="720@0"
|
|
const mapTag = mapTags[0];
|
|
const verbatimInitSegmentUri = mapTag.getRequiredAttrValue('URI');
|
|
const absoluteInitSegmentUri = shaka.hls.Utils.constructAbsoluteUri(
|
|
playlist.absoluteUri, verbatimInitSegmentUri);
|
|
|
|
let startByte = 0;
|
|
let endByte = null;
|
|
const byterange = mapTag.getAttributeValue('BYTERANGE');
|
|
// If a BYTERANGE attribute is not specified, the segment consists
|
|
// of the entire resource.
|
|
if (byterange) {
|
|
const blocks = byterange.split('@');
|
|
const byteLength = Number(blocks[0]);
|
|
startByte = Number(blocks[1]);
|
|
endByte = startByte + byteLength - 1;
|
|
}
|
|
|
|
return new shaka.media.InitSegmentReference(
|
|
() => [absoluteInitSegmentUri],
|
|
startByte,
|
|
endByte);
|
|
}
|
|
|
|
/**
|
|
* Parses one shaka.hls.Segment object into a shaka.media.SegmentReference.
|
|
*
|
|
* @param {shaka.media.InitSegmentReference} initSegmentReference
|
|
* @param {shaka.media.SegmentReference} previousReference
|
|
* @param {!shaka.hls.Segment} hlsSegment
|
|
* @param {number} position
|
|
* @param {number} startTime
|
|
* @return {!shaka.media.SegmentReference}
|
|
* @private
|
|
*/
|
|
createSegmentReference_(
|
|
initSegmentReference, previousReference, hlsSegment, position,
|
|
startTime) {
|
|
const tags = hlsSegment.tags;
|
|
const absoluteSegmentUri = hlsSegment.absoluteUri;
|
|
|
|
const extinfTag = this.getRequiredTag_(tags, 'EXTINF');
|
|
// The EXTINF tag format is '#EXTINF:<duration>,[<title>]'.
|
|
// We're interested in the duration part.
|
|
const extinfValues = extinfTag.value.split(',');
|
|
const duration = Number(extinfValues[0]);
|
|
const endTime = startTime + duration;
|
|
|
|
let startByte = 0;
|
|
let endByte = null;
|
|
const byterange =
|
|
shaka.hls.Utils.getFirstTagWithName(tags, 'EXT-X-BYTERANGE');
|
|
|
|
// If BYTERANGE is not specified, the segment consists of the entire
|
|
// resource.
|
|
if (byterange) {
|
|
const blocks = byterange.value.split('@');
|
|
const byteLength = Number(blocks[0]);
|
|
if (blocks[1]) {
|
|
startByte = Number(blocks[1]);
|
|
} else {
|
|
goog.asserts.assert(previousReference,
|
|
'Cannot refer back to previous HLS segment!');
|
|
startByte = previousReference.endByte + 1;
|
|
}
|
|
endByte = startByte + byteLength - 1;
|
|
}
|
|
|
|
return new shaka.media.SegmentReference(
|
|
position,
|
|
startTime,
|
|
endTime,
|
|
() => [absoluteSegmentUri],
|
|
startByte,
|
|
endByte,
|
|
initSegmentReference,
|
|
/* presentationTimeOffset */ 0);
|
|
}
|
|
|
|
/** @private */
|
|
notifySegments_() {
|
|
// The presentation timeline may or may not be set yet.
|
|
// If it does not yet exist, hold onto the segments until it does.
|
|
if (!this.presentationTimeline_) {
|
|
return;
|
|
}
|
|
for (const segments of this.segmentsToNotifyByStream_) {
|
|
// HLS doesn't have separate periods.
|
|
this.presentationTimeline_.notifySegments(segments, /* periodStart */ 0);
|
|
}
|
|
this.segmentsToNotifyByStream_ = [];
|
|
}
|
|
|
|
/**
|
|
* Parses shaka.hls.Segment objects into shaka.media.SegmentReferences.
|
|
*
|
|
* @param {string} verbatimMediaPlaylistUri
|
|
* @param {!shaka.hls.Playlist} playlist
|
|
* @param {number} startPosition
|
|
* @param {string} mimeType
|
|
* @param {string} codecs
|
|
* @return {!Promise<!Array.<!shaka.media.SegmentReference>>}
|
|
* @private
|
|
*/
|
|
async createSegments_(
|
|
verbatimMediaPlaylistUri, playlist, startPosition, mimeType, codecs) {
|
|
/** @type {Array.<!shaka.hls.Segment>} */
|
|
const hlsSegments = playlist.segments;
|
|
/** @type {!Array.<!shaka.media.SegmentReference>} */
|
|
const references = [];
|
|
|
|
const initSegmentRef = this.createInitSegmentReference_(playlist);
|
|
|
|
goog.asserts.assert(hlsSegments.length, 'Playlist should have segments!');
|
|
// We may need to look at the media itself to determine a segment start
|
|
// time.
|
|
const firstSegmentUri = hlsSegments[0].absoluteUri;
|
|
const firstSegmentRef = this.createSegmentReference_(
|
|
initSegmentRef,
|
|
/* previousReference */ null,
|
|
hlsSegments[0],
|
|
startPosition,
|
|
/* startTime, dummy value */ 0);
|
|
|
|
const firstStartTime = await this.getStartTime_(verbatimMediaPlaylistUri,
|
|
initSegmentRef, firstSegmentRef, mimeType, codecs);
|
|
shaka.log.debug('First segment', firstSegmentUri.split('/').pop(),
|
|
'starts at', firstStartTime);
|
|
const enumerate = (it) => shaka.util.Iterables.enumerate(it);
|
|
for (const {i, item} of enumerate(hlsSegments)) {
|
|
const previousReference = references[references.length - 1];
|
|
const startTime = (i == 0) ? firstStartTime : previousReference.endTime;
|
|
const position = startPosition + i;
|
|
|
|
const reference = this.createSegmentReference_(
|
|
initSegmentRef,
|
|
previousReference,
|
|
item,
|
|
position,
|
|
startTime);
|
|
references.push(reference);
|
|
}
|
|
|
|
this.segmentsToNotifyByStream_.push(references);
|
|
this.notifySegments_();
|
|
|
|
return references;
|
|
}
|
|
|
|
/**
|
|
* Try to fetch a partial segment, and fall back to a full segment if we have
|
|
* to.
|
|
*
|
|
* @param {!shaka.media.AnySegmentReference} reference
|
|
* @param {boolean=} fullOnly
|
|
* @return {!Promise.<shaka.extern.Response>}
|
|
* @throws {shaka.util.Error}
|
|
* @private
|
|
*/
|
|
async fetchPartialSegment_(reference, fullOnly) {
|
|
const RequestType = shaka.net.NetworkingEngine.RequestType;
|
|
|
|
// Create two requests:
|
|
// 1. A partial request meant to fetch the smallest part of the segment
|
|
// required to get the time stamp.
|
|
// 2. A full request meant as a fallback for when the server does not
|
|
// support partial requests.
|
|
|
|
const partialRequest = shaka.util.Networking.createSegmentRequest(
|
|
reference.getUris(),
|
|
reference.startByte,
|
|
reference.startByte + shaka.hls.HlsParser.PARTIAL_SEGMENT_SIZE_ - 1,
|
|
this.config_.retryParameters);
|
|
|
|
const fullRequest = shaka.util.Networking.createSegmentRequest(
|
|
reference.getUris(),
|
|
reference.startByte,
|
|
reference.endByte,
|
|
this.config_.retryParameters);
|
|
|
|
if (fullOnly) {
|
|
return this.makeNetworkRequest_(fullRequest, RequestType.SEGMENT);
|
|
}
|
|
|
|
// TODO(vaage): The need to do fall back requests is not likely to be unique
|
|
// to here. It would be nice if the fallback(s) could be included into
|
|
// the same abortable operation as the original request.
|
|
//
|
|
// What would need to change with networking engine to support requests
|
|
// with fallback(s)?
|
|
|
|
try {
|
|
const response = await this.makeNetworkRequest_(
|
|
partialRequest, RequestType.SEGMENT);
|
|
|
|
return response;
|
|
} catch (e) {
|
|
// If the networking operation was aborted, we don't want to treat it as
|
|
// a request failure. We surface the error so that the OPERATION_ABORTED
|
|
// error will be handled correctly.
|
|
if (e.code == shaka.util.Error.Code.OPERATION_ABORTED) {
|
|
throw e;
|
|
}
|
|
|
|
// The partial request may fail for a number of reasons.
|
|
// Some servers do not support Range requests, and others do not support
|
|
// the OPTIONS request which must be made before any cross-origin Range
|
|
// request. Since this fallback is expensive, warn the app developer.
|
|
shaka.log.alwaysWarn('Unable to fetch a partial HLS segment! ' +
|
|
'Falling back to a full segment request, ' +
|
|
'which is expensive! Your server should ' +
|
|
'support Range requests and CORS preflights.',
|
|
partialRequest.uris[0]);
|
|
|
|
const response = await this.makeNetworkRequest_(
|
|
fullRequest, RequestType.SEGMENT);
|
|
|
|
return response;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets the start time of a segment from the existing manifest (if possible)
|
|
* or by downloading it and parsing it otherwise.
|
|
*
|
|
* @param {string} verbatimMediaPlaylistUri
|
|
* @param {shaka.media.InitSegmentReference} initSegmentRef
|
|
* @param {!shaka.media.SegmentReference} segmentRef
|
|
* @param {string} mimeType
|
|
* @param {string} codecs
|
|
* @return {!Promise.<number>}
|
|
* @throws {shaka.util.Error}
|
|
* @private
|
|
*/
|
|
async getStartTime_(
|
|
verbatimMediaPlaylistUri, initSegmentRef, segmentRef, mimeType, codecs) {
|
|
// If we are updating the manifest, we can usually skip fetching the segment
|
|
// by examining the references we already have. This won't be possible if
|
|
// there was some kind of lag or delay updating the manifest on the server,
|
|
// in which extreme case we would fall back to fetching a segment. This
|
|
// allows us to both avoid fetching segments when possible, and recover from
|
|
// certain server-side issues gracefully.
|
|
if (this.manifest_) {
|
|
const streamInfo =
|
|
this.uriToStreamInfosMap_.get(verbatimMediaPlaylistUri);
|
|
const segmentIndex = streamInfo.stream.segmentIndex;
|
|
const reference = segmentIndex.get(segmentRef.position);
|
|
if (reference) {
|
|
// We found it! Avoid fetching and parsing the segment.
|
|
shaka.log.v1('Found segment start time in previous manifest');
|
|
return reference.startTime;
|
|
}
|
|
|
|
shaka.log.debug(
|
|
'Unable to find segment start time in previous manifest!');
|
|
}
|
|
|
|
// TODO: Introduce a new tag to extend HLS and provide the first segment's
|
|
// start time. This will avoid the need for these fetches in content
|
|
// packaged with Shaka Packager. This web-friendly extension to HLS can
|
|
// then be proposed to Apple for inclusion in a future version of HLS.
|
|
// See https://github.com/google/shaka-packager/issues/294
|
|
|
|
shaka.log.v1('Fetching segment to find start time');
|
|
|
|
if (mimeType == 'audio/mpeg') {
|
|
// There is no standard way to embed timestamps in mp3 files, so the
|
|
// start time is presumably 0.
|
|
return 0;
|
|
}
|
|
|
|
if (mimeType == 'video/mp4' || mimeType == 'audio/mp4') {
|
|
// We also need the init segment to get the correct timescale. But if the
|
|
// stream is self-initializing, use the same response for both.
|
|
const fetches = [this.fetchPartialSegment_(segmentRef)];
|
|
|
|
if (initSegmentRef) {
|
|
fetches.push(this.fetchPartialSegment_(initSegmentRef));
|
|
}
|
|
|
|
const responses = await Promise.all(fetches);
|
|
|
|
// If the stream is self-initializing, use the main segment in-place of
|
|
// the init segment.
|
|
const segmentResponse = responses[0];
|
|
const initSegmentResponse = responses[1] || responses[0];
|
|
|
|
return this.getStartTimeFromMp4Segment_(
|
|
segmentResponse.data, initSegmentResponse.data);
|
|
}
|
|
|
|
if (mimeType == 'video/mp2t') {
|
|
const response = await this.fetchPartialSegment_(segmentRef);
|
|
goog.asserts.assert(response.data, 'Should have a response body!');
|
|
return this.getStartTimeFromTsSegment_(response.data);
|
|
}
|
|
|
|
if (mimeType == 'application/mp4' || mimeType.startsWith('text/')) {
|
|
return this.getStartTimeFromTextSegmentRef_(mimeType, codecs, segmentRef);
|
|
}
|
|
|
|
// TODO(vaage): Add support for additional formats.
|
|
// Formats:
|
|
// - WebM
|
|
// - AAC
|
|
//
|
|
// Since we want to add more formats, how would a more general registry
|
|
// system work to allow additional formats to be "plugged-into" the
|
|
// parser.
|
|
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.HLS_COULD_NOT_PARSE_SEGMENT_START_TIME);
|
|
}
|
|
|
|
/**
|
|
* Parses an mp4 segment to get its start time.
|
|
*
|
|
* @param {!ArrayBuffer} mediaData
|
|
* @param {!ArrayBuffer} initData
|
|
* @return {number}
|
|
* @throws {shaka.util.Error}
|
|
* @private
|
|
*/
|
|
getStartTimeFromMp4Segment_(mediaData, initData) {
|
|
const Mp4Parser = shaka.util.Mp4Parser;
|
|
|
|
let timescale = 0;
|
|
new Mp4Parser()
|
|
.box('moov', Mp4Parser.children)
|
|
.box('trak', Mp4Parser.children)
|
|
.box('mdia', Mp4Parser.children)
|
|
.fullBox('mdhd', (box) => {
|
|
goog.asserts.assert(
|
|
box.version == 0 || box.version == 1,
|
|
'MDHD version can only be 0 or 1');
|
|
|
|
// Skip "creation_time" and "modification_time".
|
|
// They are 4 bytes each if the mdhd box is version 0, 8 bytes each
|
|
// if it is version 1.
|
|
box.reader.skip(box.version == 0 ? 8 : 16);
|
|
|
|
timescale = box.reader.readUint32();
|
|
box.parser.stop();
|
|
}).parse(initData, true /* partialOkay */);
|
|
|
|
if (!timescale) {
|
|
shaka.log.error('Unable to find timescale in init segment!');
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.HLS_COULD_NOT_PARSE_SEGMENT_START_TIME);
|
|
}
|
|
|
|
let startTime = 0;
|
|
let parsedMedia = false;
|
|
new Mp4Parser()
|
|
.box('moof', Mp4Parser.children)
|
|
.box('traf', Mp4Parser.children)
|
|
.fullBox('tfdt', (box) => {
|
|
goog.asserts.assert(
|
|
box.version == 0 || box.version == 1,
|
|
'TFDT version can only be 0 or 1');
|
|
const baseTime = (box.version == 0) ?
|
|
box.reader.readUint32() :
|
|
box.reader.readUint64();
|
|
startTime = baseTime / timescale;
|
|
parsedMedia = true;
|
|
box.parser.stop();
|
|
}).parse(mediaData, true /* partialOkay */);
|
|
|
|
if (!parsedMedia) {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.HLS_COULD_NOT_PARSE_SEGMENT_START_TIME);
|
|
}
|
|
return startTime;
|
|
}
|
|
|
|
/**
|
|
* Parses a TS segment to get its start time.
|
|
*
|
|
* @param {!ArrayBuffer} data
|
|
* @return {number}
|
|
* @throws {shaka.util.Error}
|
|
* @private
|
|
*/
|
|
getStartTimeFromTsSegment_(data) {
|
|
const reader = new shaka.util.DataViewReader(
|
|
new DataView(data), shaka.util.DataViewReader.Endianness.BIG_ENDIAN);
|
|
|
|
const fail = () => {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.HLS_COULD_NOT_PARSE_SEGMENT_START_TIME);
|
|
};
|
|
|
|
let packetStart = 0;
|
|
let syncByte = 0;
|
|
|
|
const skipPacket = () => {
|
|
// 188-byte packets are standard, so assume that.
|
|
reader.seek(packetStart + 188);
|
|
syncByte = reader.readUint8();
|
|
if (syncByte != 0x47) {
|
|
// We haven't found the sync byte, so try it as a 192-byte packet.
|
|
reader.seek(packetStart + 192);
|
|
syncByte = reader.readUint8();
|
|
}
|
|
if (syncByte != 0x47) {
|
|
// We still haven't found the sync byte, so try as a 204-byte packet.
|
|
reader.seek(packetStart + 204);
|
|
syncByte = reader.readUint8();
|
|
}
|
|
if (syncByte != 0x47) {
|
|
// We still haven't found the sync byte, so the packet was of a
|
|
// non-standard size.
|
|
fail();
|
|
}
|
|
// Put the sync byte back so we can read it in the next loop.
|
|
reader.rewind(1);
|
|
};
|
|
|
|
// TODO: refactor this while loop for better readability.
|
|
// eslint-disable-next-line no-constant-condition
|
|
while (true) {
|
|
// Format reference: https://bit.ly/TsPacket
|
|
packetStart = reader.getPosition();
|
|
|
|
syncByte = reader.readUint8();
|
|
if (syncByte != 0x47) {
|
|
fail();
|
|
}
|
|
|
|
const flagsAndPacketId = reader.readUint16();
|
|
const hasPesPacket = flagsAndPacketId & 0x4000;
|
|
if (!hasPesPacket) {
|
|
fail();
|
|
}
|
|
|
|
const flags = reader.readUint8();
|
|
const adaptationFieldControl = (flags & 0x30) >> 4;
|
|
if (adaptationFieldControl == 0 /* reserved */ ||
|
|
adaptationFieldControl == 2 /* adaptation field, no payload */) {
|
|
fail();
|
|
}
|
|
|
|
if (adaptationFieldControl == 3) {
|
|
// Skip over adaptation field.
|
|
const length = reader.readUint8();
|
|
reader.skip(length);
|
|
}
|
|
|
|
// Now we come to the PES header (hopefully).
|
|
// Format reference: https://bit.ly/TsPES
|
|
const startCode = reader.readUint32();
|
|
const startCodePrefix = startCode >> 8;
|
|
if (startCodePrefix != 1) {
|
|
// Not a PES packet yet. Skip this TS packet and try again.
|
|
skipPacket();
|
|
continue;
|
|
}
|
|
|
|
// Skip the 16-bit PES length and the first 8 bits of the optional header.
|
|
reader.skip(3);
|
|
// The next 8 bits contain flags about DTS & PTS.
|
|
const ptsDtsIndicator = reader.readUint8() >> 6;
|
|
if (ptsDtsIndicator == 0 /* no timestamp */ ||
|
|
ptsDtsIndicator == 1 /* forbidden */) {
|
|
fail();
|
|
}
|
|
|
|
const pesHeaderLengthRemaining = reader.readUint8();
|
|
if (pesHeaderLengthRemaining == 0) {
|
|
fail();
|
|
}
|
|
|
|
if (ptsDtsIndicator == 2 /* PTS only */) {
|
|
goog.asserts.assert(pesHeaderLengthRemaining == 5, 'Bad PES header?');
|
|
} else if (ptsDtsIndicator == 3 /* PTS and DTS */) {
|
|
goog.asserts.assert(pesHeaderLengthRemaining == 10, 'Bad PES header?');
|
|
}
|
|
|
|
const pts0 = reader.readUint8();
|
|
const pts1 = reader.readUint16();
|
|
const pts2 = reader.readUint16();
|
|
// Reconstruct 33-bit PTS from the 5-byte, padded structure.
|
|
const ptsHigh3 = (pts0 & 0x0e) >> 1;
|
|
const ptsLow30 = ((pts1 & 0xfffe) << 14) | ((pts2 & 0xfffe) >> 1);
|
|
// Reconstruct the PTS as a float. Avoid bitwise operations to combine
|
|
// because bitwise ops treat the values as 32-bit ints.
|
|
const pts = ptsHigh3 * (1 << 30) + ptsLow30;
|
|
return pts / shaka.hls.HlsParser.TS_TIMESCALE_;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Requests then parses a text segment to get its start time.
|
|
*
|
|
* @param {string} mimeType
|
|
* @param {string} codecs
|
|
* @param {!shaka.media.SegmentReference} segmentRef
|
|
* @return {!Promise.<number>}
|
|
* @throws {shaka.util.Error}
|
|
* @private
|
|
*/
|
|
async getStartTimeFromTextSegmentRef_(mimeType, codecs, segmentRef) {
|
|
const fullMimeType = shaka.util.MimeUtils.getFullType(mimeType, codecs);
|
|
if (!shaka.text.TextEngine.isTypeSupported(fullMimeType)) {
|
|
// We won't be able to parse this, but it will be filtered out anyway.
|
|
// So we don't have to care about the start time.
|
|
return 0;
|
|
}
|
|
|
|
/** @type {!shaka.text.TextEngine} */
|
|
const textEngine = new shaka.text.TextEngine(/* displayer */ null);
|
|
textEngine.initParser(fullMimeType);
|
|
|
|
const fullOnly = !textEngine.getSupportsPartial();
|
|
const response = await this.fetchPartialSegment_(segmentRef, fullOnly);
|
|
goog.asserts.assert(response.data, 'Should have a response body!');
|
|
return textEngine.getStartTime(response.data);
|
|
}
|
|
|
|
/**
|
|
* Attempts to guess which codecs from the codecs list belong to a given
|
|
* content type.
|
|
* Assumes that at least one codec is correct, and throws if none are.
|
|
*
|
|
* @param {string} contentType
|
|
* @param {!Array.<string>} codecs
|
|
* @return {string}
|
|
* @private
|
|
* @throws {shaka.util.Error}
|
|
*/
|
|
guessCodecs_(contentType, codecs) {
|
|
if (codecs.length == 1) {
|
|
return codecs[0];
|
|
}
|
|
|
|
const match = this.guessCodecsSafe_(contentType, codecs);
|
|
// A failure is specifically denoted by null; an empty string represents a
|
|
// valid match of no codec.
|
|
if (match != null) {
|
|
return match;
|
|
}
|
|
|
|
// Unable to guess codecs.
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.HLS_COULD_NOT_GUESS_CODECS,
|
|
codecs);
|
|
}
|
|
|
|
/**
|
|
* Attempts to guess which codecs from the codecs list belong to a given
|
|
* content type. Does not assume a single codec is anything special, and does
|
|
* not throw if it fails to match.
|
|
*
|
|
* @param {string} contentType
|
|
* @param {!Array.<string>} codecs
|
|
* @return {?string} or null if no match is found
|
|
* @private
|
|
*/
|
|
guessCodecsSafe_(contentType, codecs) {
|
|
const formats =
|
|
shaka.hls.HlsParser.CODEC_REGEXPS_BY_CONTENT_TYPE_[contentType];
|
|
for (const format of formats) {
|
|
for (const codec of codecs) {
|
|
if (format.test(codec.trim())) {
|
|
return codec.trim();
|
|
}
|
|
}
|
|
}
|
|
|
|
// Text does not require a codec string.
|
|
if (contentType == shaka.util.ManifestParserUtils.ContentType.TEXT) {
|
|
return '';
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Attempts to guess stream's mime type based on content type and URI.
|
|
*
|
|
* @param {string} contentType
|
|
* @param {string} codecs
|
|
* @param {!shaka.hls.Playlist} playlist
|
|
* @return {!Promise.<string>}
|
|
* @private
|
|
* @throws {shaka.util.Error}
|
|
*/
|
|
async guessMimeType_(contentType, codecs, playlist) {
|
|
const HlsParser = shaka.hls.HlsParser;
|
|
const ContentType = shaka.util.ManifestParserUtils.ContentType;
|
|
const RequestType = shaka.net.NetworkingEngine.RequestType;
|
|
|
|
goog.asserts.assert(playlist.segments.length,
|
|
'Playlist should have segments!');
|
|
const firstSegmentUri = playlist.segments[0].absoluteUri;
|
|
|
|
const parsedUri = new goog.Uri(firstSegmentUri);
|
|
const extension = parsedUri.getPath().split('.').pop();
|
|
const map = HlsParser.EXTENSION_MAP_BY_CONTENT_TYPE_[contentType];
|
|
|
|
const mimeType = map[extension];
|
|
if (mimeType) {
|
|
return mimeType;
|
|
}
|
|
|
|
if (contentType == ContentType.TEXT) {
|
|
// The extension map didn't work.
|
|
if (!codecs || codecs == 'vtt') {
|
|
// If codecs is 'vtt', it's WebVTT.
|
|
// If there was no codecs string, assume HLS text streams are WebVTT.
|
|
return 'text/vtt';
|
|
} else {
|
|
// Otherwise, assume MP4-embedded text, since text-based formats tend
|
|
// not to have a codecs string at all.
|
|
return 'application/mp4';
|
|
}
|
|
}
|
|
|
|
// If unable to guess mime type, request a segment and try getting it
|
|
// from the response.
|
|
const headRequest = shaka.net.NetworkingEngine.makeRequest(
|
|
[firstSegmentUri], this.config_.retryParameters);
|
|
headRequest.method = 'HEAD';
|
|
|
|
const response = await this.makeNetworkRequest_(
|
|
headRequest, RequestType.SEGMENT);
|
|
|
|
const contentMimeType = response.headers['content-type'];
|
|
|
|
if (!contentMimeType) {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.HLS_COULD_NOT_GUESS_MIME_TYPE,
|
|
extension);
|
|
}
|
|
|
|
// Split the MIME type in case the server sent additional parameters.
|
|
return contentMimeType.split(';')[0];
|
|
}
|
|
|
|
/**
|
|
* Returns a tag with a given name.
|
|
* Throws an error if tag was not found.
|
|
*
|
|
* @param {!Array.<shaka.hls.Tag>} tags
|
|
* @param {string} tagName
|
|
* @return {!shaka.hls.Tag}
|
|
* @private
|
|
* @throws {shaka.util.Error}
|
|
*/
|
|
getRequiredTag_(tags, tagName) {
|
|
const tag = shaka.hls.Utils.getFirstTagWithName(tags, tagName);
|
|
if (!tag) {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.MANIFEST,
|
|
shaka.util.Error.Code.HLS_REQUIRED_TAG_MISSING, tagName);
|
|
}
|
|
|
|
return tag;
|
|
}
|
|
|
|
/**
|
|
* @param {shaka.extern.Stream} stream
|
|
* @param {?string} width
|
|
* @param {?string} height
|
|
* @param {?string} frameRate
|
|
* @private
|
|
*/
|
|
addVideoAttributes_(stream, width, height, frameRate) {
|
|
if (stream) {
|
|
stream.width = Number(width) || undefined;
|
|
stream.height = Number(height) || undefined;
|
|
stream.frameRate = Number(frameRate) || undefined;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Makes a network request for the manifest and returns a Promise
|
|
* with the resulting data.
|
|
*
|
|
* @param {string} absoluteUri
|
|
* @return {!Promise.<!shaka.extern.Response>}
|
|
* @private
|
|
*/
|
|
requestManifest_(absoluteUri) {
|
|
const RequestType = shaka.net.NetworkingEngine.RequestType;
|
|
|
|
const request = shaka.net.NetworkingEngine.makeRequest(
|
|
[absoluteUri], this.config_.retryParameters);
|
|
|
|
return this.makeNetworkRequest_(request, RequestType.MANIFEST);
|
|
}
|
|
|
|
/**
|
|
* Called when the update timer ticks. Because parsing a manifest is async,
|
|
* this method is async. To work with this, this method will schedule the next
|
|
* update when it finished instead of using a repeating-start.
|
|
*
|
|
* @return {!Promise}
|
|
* @private
|
|
*/
|
|
async onUpdate_() {
|
|
shaka.log.info('Updating manifest...');
|
|
|
|
goog.asserts.assert(
|
|
this.updatePlaylistDelay_ > 0,
|
|
'We should only call |onUpdate_| when we are suppose to be updating.');
|
|
|
|
// Detect a call to stop()
|
|
if (!this.playerInterface_) {
|
|
return;
|
|
}
|
|
|
|
try {
|
|
await this.update();
|
|
|
|
const delay = this.updatePlaylistDelay_;
|
|
this.updatePlaylistTimer_.tickAfter(/* seconds= */ delay);
|
|
} catch (error) {
|
|
goog.asserts.assert(error instanceof shaka.util.Error,
|
|
'Should only receive a Shaka error');
|
|
|
|
// We will retry updating, so override the severity of the error.
|
|
error.severity = shaka.util.Error.Severity.RECOVERABLE;
|
|
this.playerInterface_.onError(error);
|
|
|
|
// Try again very soon.
|
|
this.updatePlaylistTimer_.tickAfter(/* seconds= */ 0.1);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* @return {boolean}
|
|
* @private
|
|
*/
|
|
isLive_() {
|
|
const PresentationType = shaka.hls.HlsParser.PresentationType_;
|
|
return this.presentationType_ != PresentationType.VOD;
|
|
}
|
|
|
|
|
|
/**
|
|
* @param {shaka.hls.HlsParser.PresentationType_} type
|
|
* @private
|
|
*/
|
|
setPresentationType_(type) {
|
|
this.presentationType_ = type;
|
|
|
|
if (this.presentationTimeline_) {
|
|
this.presentationTimeline_.setStatic(!this.isLive_());
|
|
}
|
|
|
|
// If this manifest is not for live content, then we have no reason to
|
|
// update it.
|
|
if (!this.isLive_()) {
|
|
this.updatePlaylistTimer_.stop();
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Create a networking request. This will manage the request using the
|
|
* parser's operation manager. If the parser has already been stopped, the
|
|
* request will not be made.
|
|
*
|
|
* @param {shaka.extern.Request} request
|
|
* @param {shaka.net.NetworkingEngine.RequestType} type
|
|
* @return {!Promise.<shaka.extern.Response>}
|
|
* @private
|
|
*/
|
|
makeNetworkRequest_(request, type) {
|
|
if (!this.operationManager_) {
|
|
throw new shaka.util.Error(
|
|
shaka.util.Error.Severity.CRITICAL,
|
|
shaka.util.Error.Category.PLAYER,
|
|
shaka.util.Error.Code.OPERATION_ABORTED);
|
|
}
|
|
|
|
const op = this.playerInterface_.networkingEngine.request(type, request);
|
|
this.operationManager_.manage(op);
|
|
|
|
return op.promise;
|
|
}
|
|
|
|
/**
|
|
* @param {!shaka.hls.Tag} drmTag
|
|
* @return {?shaka.extern.DrmInfo}
|
|
* @private
|
|
*/
|
|
static widevineDrmParser_(drmTag) {
|
|
const method = drmTag.getRequiredAttrValue('METHOD');
|
|
shaka.Deprecate.deprecateFeature(
|
|
2, 6,
|
|
'HLS SAMPLE-AES-CENC',
|
|
'SAMPLE-AES-CENC will no longer be supported, see Issue #1227');
|
|
const VALID_METHODS = ['SAMPLE-AES', 'SAMPLE-AES-CTR', 'SAMPLE-AES-CENC'];
|
|
if (!VALID_METHODS.includes(method)) {
|
|
shaka.log.error('Widevine in HLS is only supported with [',
|
|
VALID_METHODS.join(', '), '], not', method);
|
|
return null;
|
|
}
|
|
|
|
const uri = drmTag.getRequiredAttrValue('URI');
|
|
const parsedData = shaka.net.DataUriPlugin.parseRaw(uri);
|
|
|
|
// The data encoded in the URI is a PSSH box to be used as init data.
|
|
const pssh = new Uint8Array(parsedData.data);
|
|
const drmInfo = shaka.util.ManifestParserUtils.createDrmInfo(
|
|
'com.widevine.alpha', [
|
|
{initDataType: 'cenc', initData: pssh},
|
|
]);
|
|
|
|
const keyId = drmTag.getAttributeValue('KEYID');
|
|
if (keyId) {
|
|
// This value should begin with '0x':
|
|
goog.asserts.assert(keyId.startsWith('0x'), 'Incorrect KEYID format!');
|
|
// But the output should not contain the '0x':
|
|
drmInfo.keyIds = [keyId.substr(2).toLowerCase()];
|
|
}
|
|
return drmInfo;
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* @typedef {{
|
|
* stream: !shaka.extern.Stream,
|
|
* drmInfos: !Array.<shaka.extern.DrmInfo>,
|
|
* verbatimMediaPlaylistUri: string,
|
|
* absoluteMediaPlaylistUri: string,
|
|
* minTimestamp: number,
|
|
* maxTimestamp: number
|
|
* }}
|
|
*
|
|
* @description
|
|
* Contains a stream and information about it.
|
|
*
|
|
* @property {!shaka.extern.Stream} stream
|
|
* The Stream itself.
|
|
* @property {!Array.<shaka.extern.DrmInfo>} drmInfos
|
|
* DrmInfos of the stream. There may be multiple for multi-DRM content.
|
|
* @property {string} verbatimMediaPlaylistUri
|
|
* The verbatim media playlist URI, as it appeared in the master playlist.
|
|
* This has not been canonicalized into an absolute URI. This gives us a
|
|
* consistent key for this playlist, even if redirects cause us to update
|
|
* from different origins each time.
|
|
* @property {string} absoluteMediaPlaylistUri
|
|
* The absolute media playlist URI, resolved relative to the master playlist
|
|
* and updated to reflect any redirects.
|
|
* @property {number} minTimestamp
|
|
* The minimum timestamp found in the stream.
|
|
* @property {number} maxTimestamp
|
|
* The maximum timestamp found in the stream.
|
|
*/
|
|
shaka.hls.HlsParser.StreamInfo;
|
|
|
|
|
|
/**
|
|
* @typedef {{
|
|
* audio: !Array.<shaka.hls.HlsParser.StreamInfo>,
|
|
* video: !Array.<shaka.hls.HlsParser.StreamInfo>
|
|
* }}
|
|
*
|
|
* @description Audio and video stream infos.
|
|
* @property {!Array.<shaka.hls.HlsParser.StreamInfo>} audio
|
|
* @property {!Array.<shaka.hls.HlsParser.StreamInfo>} video
|
|
*/
|
|
shaka.hls.HlsParser.StreamInfos;
|
|
|
|
|
|
/**
|
|
* A list of regexps to detect well-known video codecs.
|
|
*
|
|
* @const {!Array.<!RegExp>}
|
|
* @private
|
|
*/
|
|
shaka.hls.HlsParser.VIDEO_CODEC_REGEXPS_ = [
|
|
/^avc/,
|
|
/^hev/,
|
|
/^hvc/,
|
|
/^vp0?[89]/,
|
|
/^av1$/,
|
|
];
|
|
|
|
|
|
/**
|
|
* A list of regexps to detect well-known audio codecs.
|
|
*
|
|
* @const {!Array.<!RegExp>}
|
|
* @private
|
|
*/
|
|
shaka.hls.HlsParser.AUDIO_CODEC_REGEXPS_ = [
|
|
/^vorbis$/,
|
|
/^opus$/,
|
|
/^flac$/,
|
|
/^mp4a/,
|
|
/^[ae]c-3$/,
|
|
];
|
|
|
|
|
|
/**
|
|
* A list of regexps to detect well-known text codecs.
|
|
*
|
|
* @const {!Array.<!RegExp>}
|
|
* @private
|
|
*/
|
|
shaka.hls.HlsParser.TEXT_CODEC_REGEXPS_ = [
|
|
/^vtt$/,
|
|
/^wvtt/,
|
|
/^stpp/,
|
|
];
|
|
|
|
|
|
/**
|
|
* @const {!Object.<string, !Array.<!RegExp>>}
|
|
* @private
|
|
*/
|
|
shaka.hls.HlsParser.CODEC_REGEXPS_BY_CONTENT_TYPE_ = {
|
|
'audio': shaka.hls.HlsParser.AUDIO_CODEC_REGEXPS_,
|
|
'video': shaka.hls.HlsParser.VIDEO_CODEC_REGEXPS_,
|
|
'text': shaka.hls.HlsParser.TEXT_CODEC_REGEXPS_,
|
|
};
|
|
|
|
|
|
/**
|
|
* @const {!Object.<string, string>}
|
|
* @private
|
|
*/
|
|
shaka.hls.HlsParser.AUDIO_EXTENSIONS_TO_MIME_TYPES_ = {
|
|
'mp4': 'audio/mp4',
|
|
'm4s': 'audio/mp4',
|
|
'm4i': 'audio/mp4',
|
|
'm4a': 'audio/mp4',
|
|
// MPEG2-TS also uses video/ for audio: https://bit.ly/TsMse
|
|
'ts': 'video/mp2t',
|
|
};
|
|
|
|
|
|
/**
|
|
* @const {!Object.<string, string>}
|
|
* @private
|
|
*/
|
|
shaka.hls.HlsParser.VIDEO_EXTENSIONS_TO_MIME_TYPES_ = {
|
|
'mp4': 'video/mp4',
|
|
'm4s': 'video/mp4',
|
|
'm4i': 'video/mp4',
|
|
'm4v': 'video/mp4',
|
|
'ts': 'video/mp2t',
|
|
};
|
|
|
|
|
|
/**
|
|
* @const {!Object.<string, string>}
|
|
* @private
|
|
*/
|
|
shaka.hls.HlsParser.TEXT_EXTENSIONS_TO_MIME_TYPES_ = {
|
|
'mp4': 'application/mp4',
|
|
'm4s': 'application/mp4',
|
|
'm4i': 'application/mp4',
|
|
'vtt': 'text/vtt',
|
|
'ttml': 'application/ttml+xml',
|
|
};
|
|
|
|
|
|
/**
|
|
* @const {!Object.<string, !Object.<string, string>>}
|
|
* @private
|
|
*/
|
|
shaka.hls.HlsParser.EXTENSION_MAP_BY_CONTENT_TYPE_ = {
|
|
'audio': shaka.hls.HlsParser.AUDIO_EXTENSIONS_TO_MIME_TYPES_,
|
|
'video': shaka.hls.HlsParser.VIDEO_EXTENSIONS_TO_MIME_TYPES_,
|
|
'text': shaka.hls.HlsParser.TEXT_EXTENSIONS_TO_MIME_TYPES_,
|
|
};
|
|
|
|
|
|
/**
|
|
* @typedef {function(!shaka.hls.Tag):?shaka.extern.DrmInfo}
|
|
* @private
|
|
*/
|
|
shaka.hls.HlsParser.DrmParser_;
|
|
|
|
|
|
/**
|
|
* @const {!Object.<string, shaka.hls.HlsParser.DrmParser_>}
|
|
* @private
|
|
*/
|
|
shaka.hls.HlsParser.KEYFORMATS_TO_DRM_PARSERS_ = {
|
|
/* TODO: https://github.com/google/shaka-player/issues/382
|
|
'com.apple.streamingkeydelivery':
|
|
shaka.hls.HlsParser.fairplayDrmParser_,
|
|
*/
|
|
'urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed':
|
|
shaka.hls.HlsParser.widevineDrmParser_,
|
|
};
|
|
|
|
|
|
/**
|
|
* @enum {string}
|
|
* @private
|
|
*/
|
|
shaka.hls.HlsParser.PresentationType_ = {
|
|
VOD: 'VOD',
|
|
EVENT: 'EVENT',
|
|
LIVE: 'LIVE',
|
|
};
|
|
|
|
|
|
/**
|
|
* @const {number}
|
|
* @private
|
|
*/
|
|
shaka.hls.HlsParser.TS_TIMESCALE_ = 90000;
|
|
|
|
|
|
/**
|
|
* At this value, timestamps roll over in TS content.
|
|
* @const {number}
|
|
* @private
|
|
*/
|
|
shaka.hls.HlsParser.TS_ROLLOVER_ = 0x200000000;
|
|
|
|
|
|
/**
|
|
* The amount of data from the start of a segment we will try to fetch when we
|
|
* need to know the segment start time. This allows us to avoid fetching the
|
|
* entire segment in many cases.
|
|
*
|
|
* @const {number}
|
|
* @private
|
|
*/
|
|
shaka.hls.HlsParser.PARTIAL_SEGMENT_SIZE_ = 2048;
|
|
|
|
|
|
shaka.media.ManifestParser.registerParserByExtension(
|
|
'm3u8', shaka.hls.HlsParser);
|
|
shaka.media.ManifestParser.registerParserByMime(
|
|
'application/x-mpegurl', shaka.hls.HlsParser);
|
|
shaka.media.ManifestParser.registerParserByMime(
|
|
'application/vnd.apple.mpegurl', shaka.hls.HlsParser);
|