# All files / src/loader m3u8-parser.js

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     import * as URLToolkit from 'url-toolkit';

    import Fragment from './fragment';
    import Level from './level';
    import LevelKey from './level-key';

    import AttrList from '../utils/attr-list';
    import { logger } from '../utils/logger';
    import { isCodecType } from '../utils/codecs';

    /**
     * M3U8 parser
     * @module
     */

    // 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?/;

    const MP4_REGEX_SUFFIX = /\.(mp4|m4s|m4v|m4a)$/i;

    export default class M3U8Parser {
      static 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;
      }

      static convertAVC1ToAVCOTI (codec) {
        let avcdata = codec.split('.');
        let result;
        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;
      }

      static resolve (url, baseUrl) {
        return URLToolkit.buildAbsoluteURL(baseUrl, url, { alwaysNormalize: true });
      }

      static parseMasterPlaylist (string, baseurl) {
        let levels = [];
        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;
        }

        let result;
        while ((result = MASTER_PLAYLIST_REGEX.exec(string)) != null) {
          const level = {};

          const attrs = level.attrs = new AttrList(result[1]);
          level.url = M3U8Parser.resolve(result[2], baseurl);

          const 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 = M3U8Parser.convertAVC1ToAVCOTI(level.videoCodec);
          }

          levels.push(level);
        }
        return levels;
      }

      static parseMasterPlaylistMedia (string, baseurl, type, audioGroups = []) E{
        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 = M3U8Parser.resolve(attrs.URI, baseurl);
            }

            media.lang = attrs.LANGUAGE;
            Iif (!media.name) {
              media.name = media.lang;
            }

            Iif (audioGroups.length) {
              const groupCodec = M3U8Parser.findGroup(audioGroups, media.groupId);
              media.audioCodec = groupCodec ? groupCodec.codec : audioGroups[0].codec;
            }
            media.id = id++;
            medias.push(media);
          }
        }
        return medias;
      }

      static parseLevelPlaylist (string, baseurl, id, type, levelUrlId) {
        let currentSN = 0;
        let totalduration = 0;
        let level = new Level(baseurl);
        let levelkey = new LevelKey();
        let cc = 0;
        let prevFrag = null;
        let frag = new Fragment();
        let result;
        let i;

        let firstPdtIndex = null;

        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 || null;
            frag.tagList.push(title ? [ 'INF', duration, title ] : [ 'INF', duration ]);
          } else if (result[3]) { // url
            if (Number.isFinite(frag.duration)) {
              const sn = currentSN++;
              frag.type = type;
              frag.start = totalduration;
              frag.levelkey = levelkey;
              frag.sn = sn;
              frag.level = id;
              frag.cc = cc;
              frag.urlId = levelUrlId;
              frag.baseurl = baseurl;
              // avoid sliced strings    https://github.com/video-dev/hls.js/issues/939
              frag.relurl = (' ' + result[3]).slice(1);
              assignProgramDateTime(frag, prevFrag);

              level.fragments.push(frag);
              prevFrag = frag;
              totalduration += frag.duration;

              frag = new Fragment();
            }
          } else if (result[4]) { // X-BYTERANGE
            const data = (' ' + result[4]).slice(1);
            if (prevFrag) {
              frag.setByteRange(data, prevFrag);
            } else {
              frag.setByteRange(data);
            }
          } 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 (firstPdtIndex === null) {
              firstPdtIndex = level.fragments.length;
            }
          } else {
            result = result[0].match(LEVEL_PLAYLIST_REGEX_SLOW);
            for (i = 1; i < result.length; i++) {
              if (typeof 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
              const decryptparams = value1;
              const keyAttrs = new AttrList(decryptparams);
              const decryptmethod = keyAttrs.enumeratedString('METHOD');
              const decrypturi = keyAttrs.URI;
              const decryptiv = keyAttrs.hexadecimalInteger('IV');

              Eif (decryptmethod) {
                levelkey = new LevelKey();
                Eif ((decrypturi) && (['AES-128', 'SAMPLE-AES', 'SAMPLE-AES-CENC'].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': {
              const startAttrs = new AttrList(value1);
              const startTimeOffset = startAttrs.decimalFloatingPoint('TIME-OFFSET');
              // TIME-OFFSET can be 0
              Eif (Number.isFinite(startTimeOffset)) {
                level.startTimeOffset = startTimeOffset;
              }
              break;
            }
            case 'MAP': {
              const mapAttrs = new AttrList(value1);
              frag.relurl = mapAttrs.URI;
              Eif (mapAttrs.BYTERANGE) {
                frag.setByteRange(mapAttrs.BYTERANGE);
              }
              frag.baseurl = baseurl;
              frag.level = id;
              frag.type = type;
              frag.sn = 'initSegment';
              level.initSegment = frag;
              frag = new Fragment();
              frag.rawProgramDateTime = level.initSegment.rawProgramDateTime;
              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;

        if (!level.initSegment && level.fragments.length) {
          // this is a bit lurky but HLS really has no other way to tell us
          // if the fragments are TS or MP4, except if we download them :/
          // but this is to be able to handle SIDX.
          Iif (level.fragments.every((frag) => MP4_REGEX_SUFFIX.test(frag.relurl))) {
            logger.warn('MP4 fragments found but no init segment (probably no MAP, incomplete M3U8), trying to fetch SIDX');

            frag = new Fragment();
            frag.relurl = level.fragments[0].relurl;
            frag.baseurl = baseurl;
            frag.level = id;
            frag.type = type;
            frag.sn = 'initSegment';

            level.initSegment = frag;
            level.needSidxRanges = true;
          }
        }

        /**
         * Backfill any missing PDT values
           "If the first EXT-X-PROGRAM-DATE-TIME tag in a Playlist appears after
           one or more Media Segment URIs, the client SHOULD extrapolate
           backward from that tag (using EXTINF durations and/or media
           timestamps) to associate dates with those segments."
         * We have already extrapolated forward, but all fragments up to the first instance of PDT do not have their PDTs
         * computed.
         */
        if (firstPdtIndex) {
          backfillProgramDateTimes(level.fragments, firstPdtIndex);
        }

        return level;
      }
    }

    function backfillProgramDateTimes (fragments, startIndex) {
      let fragPrev = fragments[startIndex];
      for (let i = startIndex - 1; i >= 0; i--) {
        const frag = fragments[i];
        frag.programDateTime = fragPrev.programDateTime - (frag.duration * 1000);
        fragPrev = frag;
      }
    }

    function assignProgramDateTime (frag, prevFrag) {
      if (frag.rawProgramDateTime) {
        frag.programDateTime = Date.parse(frag.rawProgramDateTime);
      } else if (prevFrag && prevFrag.programDateTime) {
        frag.programDateTime = prevFrag.endProgramDateTime;
      }

      if (!Number.isFinite(frag.programDateTime)) {
        frag.programDateTime = null;
        frag.rawProgramDateTime = null;
      }
    }