# All files / src/loader playlist-loader.js

63.69% Statements 207/325
48.86% Branches 86/176
64.71% Functions 22/34
63.35% Lines 204/322

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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:(\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));
      }
    }

    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) {
          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,
            retry,
            timeout,
            retryDelay,
            maxRetryDelay;
        if(context.type === 'manifest') {
          retry = config.manifestLoadingMaxRetry;
          timeout = config.manifestLoadingTimeOut;
          retryDelay = config.manifestLoadingRetryDelay;
          maxRetryDelay = config.manifestLoadingMaxRetryTimeout;
        } else {
          retry = 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 : timeout, maxRetry : retry , retryDelay : retryDelay, maxRetryDelay : 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, audioCodec=null) {
        let result, medias = [], id = 0;
        MASTER_PLAYLIST_MEDIA_REGEX.lastIndex = 0;
        while ((result = MASTER_PLAYLIST_MEDIA_REGEX.exec(string)) != null){
          const media = {};
          var 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 (audioCodec) {
              media.audioCodec = audioCodec;
            }
            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) {
              let audioTracks = this.parseMasterPlaylistMedia(string, url, 'AUDIO', levels[0].audioCodec);
              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;