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  public static function BlockLacingType($lacingtype) {
    // http://matroska.org/technical/specs/index.html#block_structure
    static $BlockLacingType = array();
    if (empty($BlockLacingType)) {
      $BlockLacingType[0x00] = 'no lacing';
      $BlockLacingType[0x01] = 'Xiph lacing';
      $BlockLacingType[0x02] = 'fixed-size lacing';
      $BlockLacingType[0x03] = 'EBML lacing';
    }
    return (isset($BlockLacingType[$lacingtype]) ? $BlockLacingType[$lacingtype] : $lacingtype);
  }