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share/public_html/static/hls.js  view on Meta::CPAN

    var front = offset;
    var length = 0;

    while (ID3.isHeader(data, offset)) {
      // ID3 header is 10 bytes
      length += 10;

      var size = ID3._readSize(data, offset + 6);
      length += size;

      if (ID3.isFooter(data, offset + 10)) {
        // ID3 footer is 10 bytes
        length += 10;
      }

      offset += length;
    }

    if (length > 0) {
      return data.subarray(front, front + length);
    }

    return undefined;
  };

  ID3._readSize = function _readSize(data, offset) {
    var size = 0;
    size = (data[offset] & 0x7f) << 21;
    size |= (data[offset + 1] & 0x7f) << 14;
    size |= (data[offset + 2] & 0x7f) << 7;
    size |= data[offset + 3] & 0x7f;
    return size;
  };

  /**
   * Searches for the Elementary Stream timestamp found in the ID3 data chunk
   * @param {Uint8Array} data - Block of data containing one or more ID3 tags
   * @return {number} - The timestamp
   */


  ID3.getTimeStamp = function getTimeStamp(data) {
    var frames = ID3.getID3Frames(data);
    for (var i = 0; i < frames.length; i++) {
      var frame = frames[i];
      if (ID3.isTimeStampFrame(frame)) {
        return ID3._readTimeStamp(frame);
      }
    }

    return undefined;
  };

  /**
   * Returns true if the ID3 frame is an Elementary Stream timestamp frame
   * @param {ID3 frame} frame
   */


  ID3.isTimeStampFrame = function isTimeStampFrame(frame) {
    return frame && frame.key === 'PRIV' && frame.info === 'com.apple.streaming.transportStreamTimestamp';
  };

  ID3._getFrameData = function _getFrameData(data) {
    /*
    Frame ID       $xx xx xx xx (four characters)
    Size           $xx xx xx xx
    Flags          $xx xx
    */
    var type = String.fromCharCode(data[0], data[1], data[2], data[3]);
    var size = ID3._readSize(data, 4);

    // skip frame id, size, and flags
    var offset = 10;

    return { type: type, size: size, data: data.subarray(offset, offset + size) };
  };

  /**
   * Returns an array of ID3 frames found in all the ID3 tags in the id3Data
   * @param {Uint8Array} id3Data - The ID3 data containing one or more ID3 tags
   * @return {ID3 frame[]} - Array of ID3 frame objects
   */


  ID3.getID3Frames = function getID3Frames(id3Data) {
    var offset = 0;
    var frames = [];

    while (ID3.isHeader(id3Data, offset)) {
      var size = ID3._readSize(id3Data, offset + 6);
      // skip past ID3 header
      offset += 10;
      var end = offset + size;
      // loop through frames in the ID3 tag
      while (offset + 8 < end) {
        var frameData = ID3._getFrameData(id3Data.subarray(offset));
        var frame = ID3._decodeFrame(frameData);
        if (frame) {
          frames.push(frame);
        }

        // skip frame header and frame data
        offset += frameData.size + 10;
      }

      if (ID3.isFooter(id3Data, offset)) {
        offset += 10;
      }
    }

    return frames;
  };

  ID3._decodeFrame = function _decodeFrame(frame) {
    if (frame.type === 'PRIV') {
      return ID3._decodePrivFrame(frame);
    } else if (frame.type[0] === 'T') {
      return ID3._decodeTextFrame(frame);
    } else if (frame.type[0] === 'W') {
      return ID3._decodeURLFrame(frame);

share/public_html/static/hls.js  view on Meta::CPAN

          frag = new loader_fragment();
        }
      } else if (result[4]) {
        // X-BYTERANGE
        frag.rawByteRange = (' ' + result[4]).slice(1);
        if (prevFrag) {
          var lastByteRangeEndOffset = prevFrag.byteRangeEndOffset;
          if (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
        var value1 = (' ' + result[i + 1]).slice(1);
        var 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 attr_list(decryptparams);
            var decryptmethod = keyAttrs.enumeratedString('METHOD'),
                decrypturi = keyAttrs.URI,
                decryptiv = keyAttrs.hexadecimalInteger('IV');
            if (decryptmethod) {
              levelkey = new level_key();
              if (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':
            var startParams = value1;
            var startAttrs = new attr_list(startParams);
            var startTimeOffset = startAttrs.decimalFloatingPoint('TIME-OFFSET');
            // TIME-OFFSET can be 0
            if (!isNaN(startTimeOffset)) {
              level.startTimeOffset = startTimeOffset;
            }

            break;
          case 'MAP':
            var mapAttrs = new attr_list(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 loader_fragment();
            break;
          default:
            logger["b" /* logger */].warn('line parsed but not handled: ' + result);
            break;
        }
      }
    }
    frag = prevFrag;
    // logger.log('found ' + level.fragments.length + ' fragments');
    if (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 :/