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| /**
* Playlist Loader
*/
import URLToolkit from 'url-toolkit';
import Event from '../events';
import EventHandler from '../event-handler';
import {ErrorTypes, ErrorDetails} from '../errors';
import AttrList from '../utils/attr-list';
import {logger} from '../utils/logger';
import {isCodecType} from '../utils/codecs';
// https://regex101.com is your friend
const MASTER_PLAYLIST_REGEX = /#EXT-X-STREAM-INF:([^\n\r]*)[\r\n]+([^\r\n]+)/g;
const MASTER_PLAYLIST_MEDIA_REGEX = /#EXT-X-MEDIA:(.*)/g;
const LEVEL_PLAYLIST_REGEX_FAST = new RegExp([
/#EXTINF:\s*(\d*(?:\.\d+)?)(?:,(.*)\s+)?/.source, // duration (#EXTINF:<duration>,<title>), group 1 => duration, group 2 => title
/|(?!#)(\S+)/.source, // segment URI, group 3 => the URI (note newline is not eaten)
/|#EXT-X-BYTERANGE:*(.+)/.source, // next segment's byterange, group 4 => range spec (x@y)
/|#EXT-X-PROGRAM-DATE-TIME:(.+)/.source, // next segment's program date/time group 5 => the datetime spec
/|#.*/.source // All other non-segment oriented tags will match with all groups empty
].join(''), 'g');
const LEVEL_PLAYLIST_REGEX_SLOW = /(?:(?:#(EXTM3U))|(?:#EXT-X-(PLAYLIST-TYPE):(.+))|(?:#EXT-X-(MEDIA-SEQUENCE): *(\d+))|(?:#EXT-X-(TARGETDURATION): *(\d+))|(?:#EXT-X-(KEY):(.+))|(?:#EXT-X-(START):(.+))|(?:#EXT-X-(ENDLIST))|(?:#EXT-X-(DISCONTINUITY-SEQ)UENCE:(\d+))|(?:#EXT-X-(DIS)CONTINUITY))|(?:#EXT-X-(VERSION):(\d+))|(?:#EXT-X-(MAP):(.+))|(?:(#)(.*):(.*))|(?:(#)(.*))(?:.*)\r?\n?/;
class LevelKey {
constructor() {
this.method = null;
this.key = null;
this.iv = null;
this._uri = null;
}
get uri() {
if (!this._uri && this.reluri) {
this._uri = URLToolkit.buildAbsoluteURL(this.baseuri, this.reluri, { alwaysNormalize: true });
}
return this._uri;
}
}
class Fragment {
constructor() {
this._url = null;
this._byteRange = null;
this._decryptdata = null;
this.tagList = [];
}
get url() {
Eif (!this._url && this.relurl) {
this._url = URLToolkit.buildAbsoluteURL(this.baseurl, this.relurl, { alwaysNormalize: true });
}
return this._url;
}
set url(value) {
this._url = value;
}
get programDateTime() {
Eif (!this._programDateTime && this.rawProgramDateTime) {
this._programDateTime = new Date(Date.parse(this.rawProgramDateTime));
}
return this._programDateTime;
}
get byteRange() {
if (!this._byteRange) {
let byteRange = this._byteRange = [];
Eif (this.rawByteRange) {
const params = this.rawByteRange.split('@', 2);
if (params.length === 1) {
const lastByteRangeEndOffset = this.lastByteRangeEndOffset;
byteRange[0] = lastByteRangeEndOffset ? lastByteRangeEndOffset : 0;
} else {
byteRange[0] = parseInt(params[1]);
}
byteRange[1] = parseInt(params[0]) + byteRange[0];
}
}
return this._byteRange;
}
get byteRangeStartOffset() {
return this.byteRange[0];
}
get byteRangeEndOffset() {
return this.byteRange[1];
}
get decryptdata() {
if (!this._decryptdata) {
this._decryptdata = this.fragmentDecryptdataFromLevelkey(this.levelkey, this.sn);
}
return this._decryptdata;
}
/**
* Utility method for parseLevelPlaylist to create an initialization vector for a given segment
* @returns {Uint8Array}
*/
createInitializationVector(segmentNumber) {
var uint8View = new Uint8Array(16);
for (var i = 12; i < 16; i++) {
uint8View[i] = (segmentNumber >> 8 * (15 - i)) & 0xff;
}
return uint8View;
}
/**
* Utility method for parseLevelPlaylist to get a fragment's decryption data from the currently parsed encryption key data
* @param levelkey - a playlist's encryption info
* @param segmentNumber - the fragment's segment number
* @returns {*} - an object to be applied as a fragment's decryptdata
*/
fragmentDecryptdataFromLevelkey(levelkey, segmentNumber) {
var decryptdata = levelkey;
Eif (levelkey && levelkey.method && levelkey.uri && !levelkey.iv) {
decryptdata = new LevelKey();
decryptdata.method = levelkey.method;
decryptdata.baseuri = levelkey.baseuri;
decryptdata.reluri = levelkey.reluri;
decryptdata.iv = this.createInitializationVector(segmentNumber);
}
return decryptdata;
}
cloneObj(obj) {
return JSON.parse(JSON.stringify(obj));
}
}
function findGroup(groups, mediaGroupId) {
if (!groups) {
return null;
}
let matchingGroup = null;
for (let i = 0; i < groups.length; i ++) {
const group = groups[i];
if (group.id === mediaGroupId) {
matchingGroup = group;
}
}
return matchingGroup;
}
class PlaylistLoader extends EventHandler {
constructor(hls) {
super(hls,
Event.MANIFEST_LOADING,
Event.LEVEL_LOADING,
Event.AUDIO_TRACK_LOADING,
Event.SUBTITLE_TRACK_LOADING);
this.loaders = {};
}
destroy() {
for (let loaderName in this.loaders) {
let loader = this.loaders[loaderName];
if (loader) {
loader.destroy();
}
}
this.loaders = {};
EventHandler.prototype.destroy.call(this);
}
onManifestLoading(data) {
this.load(data.url, { type : 'manifest'});
}
onLevelLoading(data) {
this.load(data.url, { type : 'level', level : data.level, id : data.id});
}
onAudioTrackLoading(data) {
this.load(data.url, { type : 'audioTrack', id : data.id});
}
onSubtitleTrackLoading(data) {
this.load(data.url, { type : 'subtitleTrack', id : data.id});
}
load(url, context) {
let loader = this.loaders[context.type];
if (loader !== undefined) {
let loaderContext = loader.context;
if (loaderContext && loaderContext.url === url) {
logger.trace(`playlist request ongoing`);
return;
} else {
logger.warn(`abort previous loader for type:${context.type}`);
loader.abort();
}
}
let config = this.hls.config,
maxRetry,
timeout,
retryDelay,
maxRetryDelay;
if (context.type === 'manifest') {
maxRetry = config.manifestLoadingMaxRetry;
timeout = config.manifestLoadingTimeOut;
retryDelay = config.manifestLoadingRetryDelay;
maxRetryDelay = config.manifestLoadingMaxRetryTimeout;
} else if (context.type === 'level') {
// Disable internal loader retry logic, since we are managing retries in Level Controller
maxRetry = 0;
timeout = config.levelLoadingTimeOut;
} else {
// TODO Introduce retry settings for audio-track and subtitle-track, it should not use level retry config
maxRetry = config.levelLoadingMaxRetry;
timeout = config.levelLoadingTimeOut;
retryDelay = config.levelLoadingRetryDelay;
maxRetryDelay = config.levelLoadingMaxRetryTimeout;
logger.log(`loading playlist for ${context.type} ${context.level || context.id}`);
}
loader = this.loaders[context.type] = context.loader = typeof(config.pLoader) !== 'undefined' ? new config.pLoader(config) : new config.loader(config);
context.url = url;
context.responseType = '';
let loaderConfig, loaderCallbacks;
loaderConfig = {timeout, maxRetry, retryDelay, maxRetryDelay};
loaderCallbacks = { onSuccess : this.loadsuccess.bind(this), onError :this.loaderror.bind(this), onTimeout : this.loadtimeout.bind(this)};
loader.load(context,loaderConfig,loaderCallbacks);
}
resolve(url, baseUrl) {
return URLToolkit.buildAbsoluteURL(baseUrl, url, { alwaysNormalize: true });
}
parseMasterPlaylist(string, baseurl) {
let levels = [], result;
MASTER_PLAYLIST_REGEX.lastIndex = 0;
function setCodecs(codecs, level) {
['video', 'audio'].forEach((type) => {
const filtered = codecs.filter((codec) => isCodecType(codec, type));
if (filtered.length) {
const preferred = filtered.filter((codec) => {
return codec.lastIndexOf('avc1', 0) === 0 || codec.lastIndexOf('mp4a', 0) === 0;
});
level[`${type}Codec`] = preferred.length > 0 ? preferred[0] : filtered[0];
// remove from list
codecs = codecs.filter((codec) => filtered.indexOf(codec) === -1);
}
});
level.unknownCodecs = codecs;
}
while ((result = MASTER_PLAYLIST_REGEX.exec(string)) != null){
const level = {};
var attrs = level.attrs = new AttrList(result[1]);
level.url = this.resolve(result[2], baseurl);
var resolution = attrs.decimalResolution('RESOLUTION');
Eif(resolution) {
level.width = resolution.width;
level.height = resolution.height;
}
level.bitrate = attrs.decimalInteger('AVERAGE-BANDWIDTH') || attrs.decimalInteger('BANDWIDTH');
level.name = attrs.NAME;
setCodecs([].concat((attrs.CODECS || '').split(/[ ,]+/)), level);
if (level.videoCodec && level.videoCodec.indexOf('avc1') !== -1) {
level.videoCodec = this.avc1toavcoti(level.videoCodec);
}
levels.push(level);
}
return levels;
}
parseMasterPlaylistMedia(string, baseurl, type, audioGroups=[]) {
let result;
let medias = [];
let id = 0;
MASTER_PLAYLIST_MEDIA_REGEX.lastIndex = 0;
while ((result = MASTER_PLAYLIST_MEDIA_REGEX.exec(string)) !== null) {
const media = {};
const attrs = new AttrList(result[1]);
Eif (attrs.TYPE === type) {
media.groupId = attrs['GROUP-ID'];
media.name = attrs.NAME;
media.type = type;
media.default = (attrs.DEFAULT === 'YES');
media.autoselect = (attrs.AUTOSELECT === 'YES');
media.forced = (attrs.FORCED === 'YES');
Eif (attrs.URI) {
media.url = this.resolve(attrs.URI, baseurl);
}
media.lang = attrs.LANGUAGE;
Iif (!media.name) {
media.name = media.lang;
}
Iif (audioGroups.length) {
const groupCodec = findGroup(audioGroups, media.groupId);
media.audioCodec = groupCodec ? groupCodec.codec : audioGroups[0].codec;
}
media.id = id++;
medias.push(media);
}
}
return medias;
}
avc1toavcoti(codec) {
var result, avcdata = codec.split('.');
Iif (avcdata.length > 2) {
result = avcdata.shift() + '.';
result += parseInt(avcdata.shift()).toString(16);
result += ('000' + parseInt(avcdata.shift()).toString(16)).substr(-4);
} else {
result = codec;
}
return result;
}
parseLevelPlaylist(string, baseurl, id, type) {
var currentSN = 0,
totalduration = 0,
level = {type: null, version: null, url: baseurl, fragments: [], live: true, startSN: 0},
levelkey = new LevelKey(),
cc = 0,
prevFrag = null,
frag = new Fragment(),
result,
i;
LEVEL_PLAYLIST_REGEX_FAST.lastIndex = 0;
while ((result = LEVEL_PLAYLIST_REGEX_FAST.exec(string)) !== null) {
const duration = result[1];
if (duration) { // INF
frag.duration = parseFloat(duration);
// avoid sliced strings https://github.com/video-dev/hls.js/issues/939
const title = (' ' + result[2]).slice(1);
frag.title = title ? title : null;
frag.tagList.push(title ? [ 'INF',duration,title ] : [ 'INF',duration ]);
} else if (result[3]) { // url
Eif (!isNaN(frag.duration)) {
const sn = currentSN++;
frag.type = type;
frag.start = totalduration;
frag.levelkey = levelkey;
frag.sn = sn;
frag.level = id;
frag.cc = cc;
frag.baseurl = baseurl;
// avoid sliced strings https://github.com/video-dev/hls.js/issues/939
frag.relurl = (' ' + result[3]).slice(1);
level.fragments.push(frag);
prevFrag = frag;
totalduration += frag.duration;
frag = new Fragment();
}
} else if (result[4]) { // X-BYTERANGE
frag.rawByteRange = (' ' + result[4]).slice(1);
if (prevFrag) {
const lastByteRangeEndOffset = prevFrag.byteRangeEndOffset;
Eif (lastByteRangeEndOffset) {
frag.lastByteRangeEndOffset = lastByteRangeEndOffset;
}
}
} else if (result[5]) { // PROGRAM-DATE-TIME
// avoid sliced strings https://github.com/video-dev/hls.js/issues/939
frag.rawProgramDateTime = (' ' + result[5]).slice(1);
frag.tagList.push(['PROGRAM-DATE-TIME', frag.rawProgramDateTime]);
if (level.programDateTime === undefined) {
level.programDateTime = new Date(new Date(Date.parse(result[5])) - 1000 * totalduration);
}
} else {
result = result[0].match(LEVEL_PLAYLIST_REGEX_SLOW);
for (i = 1; i < result.length; i++) {
if (result[i] !== undefined) {
break;
}
}
// avoid sliced strings https://github.com/video-dev/hls.js/issues/939
const value1 = (' ' + result[i+1]).slice(1);
const value2 = (' ' + result[i+2]).slice(1);
switch (result[i]) {
case '#':
frag.tagList.push(value2 ? [ value1,value2 ] : [ value1 ]);
break;
case 'PLAYLIST-TYPE':
level.type = value1.toUpperCase();
break;
case 'MEDIA-SEQUENCE':
currentSN = level.startSN = parseInt(value1);
break;
case 'TARGETDURATION':
level.targetduration = parseFloat(value1);
break;
case 'VERSION':
level.version = parseInt(value1);
break;
case 'EXTM3U':
break;
case 'ENDLIST':
level.live = false;
break;
case 'DIS':
cc++;
frag.tagList.push(['DIS']);
break;
case 'DISCONTINUITY-SEQ':
cc = parseInt(value1);
break;
case 'KEY':
// https://tools.ietf.org/html/draft-pantos-http-live-streaming-08#section-3.4.4
var decryptparams = value1;
var keyAttrs = new AttrList(decryptparams);
var decryptmethod = keyAttrs.enumeratedString('METHOD'),
decrypturi = keyAttrs.URI,
decryptiv = keyAttrs.hexadecimalInteger('IV');
Eif (decryptmethod) {
levelkey = new LevelKey();
Eif ((decrypturi) && (['AES-128', 'SAMPLE-AES'].indexOf(decryptmethod) >= 0)) {
levelkey.method = decryptmethod;
// URI to get the key
levelkey.baseuri = baseurl;
levelkey.reluri = decrypturi;
levelkey.key = null;
// Initialization Vector (IV)
levelkey.iv = decryptiv;
}
}
break;
case 'START':
let startParams = value1;
let startAttrs = new AttrList(startParams);
let startTimeOffset = startAttrs.decimalFloatingPoint('TIME-OFFSET');
//TIME-OFFSET can be 0
Eif ( !isNaN(startTimeOffset) ) {
level.startTimeOffset = startTimeOffset;
}
break;
case 'MAP':
let mapAttrs = new AttrList(value1);
frag.relurl = mapAttrs.URI;
frag.rawByteRange = mapAttrs.BYTERANGE;
frag.baseurl = baseurl;
frag.level = id;
frag.type = type;
frag.sn = 'initSegment';
level.initSegment = frag;
frag = new Fragment();
break;
default:
logger.warn(`line parsed but not handled: ${result}`);
break;
}
}
}
frag = prevFrag;
//logger.log('found ' + level.fragments.length + ' fragments');
Iif(frag && !frag.relurl) {
level.fragments.pop();
totalduration-=frag.duration;
}
level.totalduration = totalduration;
level.averagetargetduration = totalduration / level.fragments.length;
level.endSN = currentSN - 1;
level.startCC = level.fragments[0] ? level.fragments[0].cc : 0;
level.endCC = cc;
return level;
}
loadsuccess(response, stats, context, networkDetails=null) {
var string = response.data,
url = response.url,
type = context.type,
id = context.id,
level = context.level,
hls = this.hls;
this.loaders[type] = undefined;
// responseURL not supported on some browsers (it is used to detect URL redirection)
// data-uri mode also not supported (but no need to detect redirection)
if (url === undefined || url.indexOf('data:') === 0) {
// fallback to initial URL
url = context.url;
}
stats.tload = performance.now();
//stats.mtime = new Date(target.getResponseHeader('Last-Modified'));
if (string.indexOf('#EXTM3U') === 0) {
if (string.indexOf('#EXTINF:') > 0) {
let isLevel = (type !== 'audioTrack' && type !== 'subtitleTrack'),
levelId = !isNaN(level) ? level : !isNaN(id) ? id : 0,
levelDetails = this.parseLevelPlaylist(string, url, levelId, (type === 'audioTrack' ? 'audio' : (type === 'subtitleTrack' ? 'subtitle' : 'main') ));
levelDetails.tload = stats.tload;
if (type === 'manifest') {
// first request, stream manifest (no master playlist), fire manifest loaded event with level details
hls.trigger(Event.MANIFEST_LOADED, {levels: [{url: url, details : levelDetails}], audioTracks : [], url: url, stats: stats, networkDetails: networkDetails});
}
stats.tparsed = performance.now();
if (levelDetails.targetduration) {
if (isLevel) {
hls.trigger(Event.LEVEL_LOADED, {details: levelDetails, level: level || 0, id: id || 0, stats: stats, networkDetails: networkDetails});
} else {
if (type === 'audioTrack') {
hls.trigger(Event.AUDIO_TRACK_LOADED, {details: levelDetails, id: id, stats: stats, networkDetails: networkDetails});
}
else if (type === 'subtitleTrack') {
hls.trigger(Event.SUBTITLE_TRACK_LOADED, {details: levelDetails, id: id, stats: stats, networkDetails: networkDetails});
}
}
} else {
hls.trigger(Event.ERROR, {type: ErrorTypes.NETWORK_ERROR, details: ErrorDetails.MANIFEST_PARSING_ERROR, fatal: true, url: url, reason: 'invalid targetduration', networkDetails: networkDetails});
}
} else {
let levels = this.parseMasterPlaylist(string, url);
// multi level playlist, parse level info
if (levels.length) {
const audioGroups = levels.map(l => ({ id: l.attrs.AUDIO, codec: l.audioCodec}));
let audioTracks = this.parseMasterPlaylistMedia(string, url, 'AUDIO', audioGroups);
let subtitles = this.parseMasterPlaylistMedia(string, url, 'SUBTITLES');
if (audioTracks.length) {
// check if we have found an audio track embedded in main playlist (audio track without URI attribute)
let embeddedAudioFound = false;
audioTracks.forEach(audioTrack => {
if(!audioTrack.url) {
embeddedAudioFound = true;
}
});
// if no embedded audio track defined, but audio codec signaled in quality level, we need to signal this main audio track
// this could happen with playlists with alt audio rendition in which quality levels (main) contains both audio+video. but with mixed audio track not signaled
if (embeddedAudioFound === false && levels[0].audioCodec && !levels[0].attrs.AUDIO) {
logger.log('audio codec signaled in quality level, but no embedded audio track signaled, create one');
audioTracks.unshift({ type : 'main', name : 'main'});
}
}
hls.trigger(Event.MANIFEST_LOADED, {levels, audioTracks, subtitles, url, stats, networkDetails});
} else {
hls.trigger(Event.ERROR, {type: ErrorTypes.NETWORK_ERROR, details: ErrorDetails.MANIFEST_PARSING_ERROR, fatal: true, url: url, reason: 'no level found in manifest', networkDetails: networkDetails});
}
}
} else {
hls.trigger(Event.ERROR, {type: ErrorTypes.NETWORK_ERROR, details: ErrorDetails.MANIFEST_PARSING_ERROR, fatal: true, url: url, reason: 'no EXTM3U delimiter', networkDetails: networkDetails});
}
}
loaderror(response, context, networkDetails=null) {
var details, fatal,loader = context.loader;
switch(context.type) {
case 'manifest':
details = ErrorDetails.MANIFEST_LOAD_ERROR;
fatal = true;
break;
case 'level':
details = ErrorDetails.LEVEL_LOAD_ERROR;
fatal = false;
break;
case 'audioTrack':
details = ErrorDetails.AUDIO_TRACK_LOAD_ERROR;
fatal = false;
break;
}
if (loader) {
loader.abort();
this.loaders[context.type] = undefined;
}
this.hls.trigger(Event.ERROR, {type: ErrorTypes.NETWORK_ERROR, details: details, fatal: fatal, url: loader.url, loader: loader, response: response, context : context, networkDetails: networkDetails});
}
loadtimeout(stats, context, networkDetails=null) {
var details, fatal, loader = context.loader;
switch(context.type) {
case 'manifest':
details = ErrorDetails.MANIFEST_LOAD_TIMEOUT;
fatal = true;
break;
case 'level':
details = ErrorDetails.LEVEL_LOAD_TIMEOUT;
fatal = false;
break;
case 'audioTrack':
details = ErrorDetails.AUDIO_TRACK_LOAD_TIMEOUT;
fatal = false;
break;
}
if (loader) {
loader.abort();
this.loaders[context.type] = undefined;
}
this.hls.trigger(Event.ERROR, {type: ErrorTypes.NETWORK_ERROR, details: details, fatal: fatal, url: loader.url, loader: loader, context : context, networkDetails: networkDetails});
}
}
export default PlaylistLoader;
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