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How to use id3 method in tracetest

Best JavaScript code snippet using tracetest

id3_parser.js

Source:id3_parser.js

1// Copyright (c) 2012 The Chromium Authors. All rights reserved.2// Use of this source code is governed by a BSD-style license that can be3// found in the LICENSE file.4/**5 * Protocol + host parts of extension URL.6 *7 * The __FILE_NAME suffix is because the same string constant is used in8 * multiple JS files, and JavaScript doesn't have C's #define mechanism (which9 * only affects the file its in). Without the suffix, we'd have "constant10 * FILE_MANAGER_HOST assigned a value more than once" compiler warnings.11 *12 * @type {string}13 * @const14 */15var FILE_MANAGER_HOST__ID3_PARSER =16    'chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj';17importScripts(18    FILE_MANAGER_HOST__ID3_PARSER +19    '/foreground/js/metadata/function_sequence.js');20importScripts(21    FILE_MANAGER_HOST__ID3_PARSER +22    '/foreground/js/metadata/function_parallel.js');23/**24 * ID3 parser.25 *26 * @param {MetadataParserLogger} parent A metadata dispatcher.27 * @constructor28 * @struct29 * @extends {MetadataParser}30 */31function Id3Parser(parent) {32  MetadataParser.call(this, parent, 'id3', /\.(mp3)$/i);33}34Id3Parser.prototype.__proto__ = MetadataParser.prototype;35/**36 * Reads synchsafe integer.37 * 'SynchSafe' term is taken from id3 documentation.38 *39 * @param {ByteReader} reader Reader to use.40 * @param {number} length Rytes to read.41 * @return {number} Synchsafe value.42 * @private43 */44Id3Parser.readSynchSafe_ = function(reader, length) {45  var rv = 0;46  switch (length) {47    case 4:48      rv = reader.readScalar(1, false) << 21;49    case 3:50      rv |= reader.readScalar(1, false) << 14;51    case 2:52      rv |= reader.readScalar(1, false) << 7;53    case 1:54      rv |= reader.readScalar(1, false);55  }56  return rv;57};58/**59 * Reads 3bytes integer.60 *61 * @param {ByteReader} reader Reader to use.62 * @return {number} Uint24 value.63 * @private64 */65Id3Parser.readUInt24_ = function(reader) {66  return reader.readScalar(2, false) << 16 | reader.readScalar(1, false);67};68/**69 * Reads string from reader with specified encoding70 *71 * @param {ByteReader} reader Reader to use.72 * @param {number} encoding String encoding.73 * @param {number} size Maximum string size. Actual result may be shorter.74 * @return {string} String value.75 * @private76 */77Id3Parser.prototype.readString_ = function(reader, encoding, size) {78  switch (encoding) {79    case Id3Parser.v2.ENCODING.ISO_8859_1:80      return reader.readNullTerminatedString(size);81    case Id3Parser.v2.ENCODING.UTF_16:82      return reader.readNullTerminatedStringUTF16(true, size);83    case Id3Parser.v2.ENCODING.UTF_16BE:84      return reader.readNullTerminatedStringUTF16(false, size);85    case Id3Parser.v2.ENCODING.UTF_8:86      // TODO: implement UTF_8.87      this.log('UTF8 encoding not supported, used ISO_8859_1 instead');88      return reader.readNullTerminatedString(size);89    default: {90      this.log('Unsupported encoding in ID3 tag: ' + encoding);91      return '';92    }93  }94};95/**96 * Reads text frame from reader.97 *98 * @param {ByteReader} reader Reader to use.99 * @param {number} majorVersion Major id3 version to use.100 * @param {Object} frame Frame so store data at.101 * @param {number} end Frame end position in reader.102 * @private103 */104Id3Parser.prototype.readTextFrame_ = function(reader,105                                              majorVersion,106                                              frame,107                                              end) {108  frame.encoding = reader.readScalar(1, false, end);109  frame.value = this.readString_(reader, frame.encoding, end - reader.tell());110};111/**112 * Reads user defined text frame from reader.113 *114 * @param {ByteReader} reader Reader to use.115 * @param {number} majorVersion Major id3 version to use.116 * @param {Object} frame Frame so store data at.117 * @param {number} end Frame end position in reader.118 * @private119 */120Id3Parser.prototype.readUserDefinedTextFrame_ = function(reader,121                                                         majorVersion,122                                                         frame,123                                                         end) {124  frame.encoding = reader.readScalar(1, false, end);125  frame.description = this.readString_(126      reader,127      frame.encoding,128      end - reader.tell());129  frame.value = this.readString_(130      reader,131      frame.encoding,132      end - reader.tell());133};134/**135 * @param {ByteReader} reader Reader to use.136 * @param {number} majorVersion Major id3 version to use.137 * @param {Object} frame Frame so store data at.138 * @param {number} end Frame end position in reader.139 * @private140 */141Id3Parser.prototype.readPIC_ = function(reader, majorVersion, frame, end) {142  frame.encoding = reader.readScalar(1, false, end);143  frame.format = reader.readNullTerminatedString(3, end - reader.tell());144  frame.pictureType = reader.readScalar(1, false, end);145  frame.description = this.readString_(reader,146                                       frame.encoding,147                                       end - reader.tell());148  if (frame.format == '-->') {149    frame.imageUrl = reader.readNullTerminatedString(end - reader.tell());150  } else {151    frame.imageUrl = reader.readImage(end - reader.tell());152  }153};154/**155 * @param {ByteReader} reader Reader to use.156 * @param {number} majorVersion Major id3 version to use.157 * @param {Object} frame Frame so store data at.158 * @param {number} end Frame end position in reader.159 * @private160 */161Id3Parser.prototype.readAPIC_ = function(reader, majorVersion, frame, end) {162  this.vlog('Extracting picture');163  frame.encoding = reader.readScalar(1, false, end);164  frame.mime = reader.readNullTerminatedString(end - reader.tell());165  frame.pictureType = reader.readScalar(1, false, end);166  frame.description = this.readString_(167      reader,168      frame.encoding,169      end - reader.tell());170  if (frame.mime == '-->') {171    frame.imageUrl = reader.readNullTerminatedString(end - reader.tell());172  } else {173    frame.imageUrl = reader.readImage(end - reader.tell());174  }175};176/**177 * Reads string from reader with specified encoding178 *179 * @param {ByteReader} reader Reader to use.180 * @param {number} majorVersion Major id3 version to use.181 * @return {Object} Frame read.182 * @private183 */184Id3Parser.prototype.readFrame_ = function(reader, majorVersion) {185  if (reader.eof())186    return null;187  var frame = {};188  reader.pushSeek(reader.tell(), ByteReader.SEEK_BEG);189  var position = reader.tell();190  frame.name = (majorVersion == 2) ? reader.readNullTerminatedString(3) :191                                     reader.readNullTerminatedString(4);192  if (frame.name == '')193    return null;194  this.vlog('Found frame ' + (frame.name) + ' at position ' + position);195  switch (majorVersion) {196    case 2:197      frame.size = Id3Parser.readUInt24_(reader);198      frame.headerSize = 6;199      break;200    case 3:201      frame.size = reader.readScalar(4, false);202      frame.headerSize = 10;203      frame.flags = reader.readScalar(2, false);204      break;205    case 4:206      frame.size = Id3Parser.readSynchSafe_(reader, 4);207      frame.headerSize = 10;208      frame.flags = reader.readScalar(2, false);209      break;210  }211  this.vlog('Found frame [' + frame.name + '] with size [' + frame.size + ']');212  if (Id3Parser.v2.HANDLERS[frame.name]) {213    Id3Parser.v2.HANDLERS[frame.name].call(214        this,215        reader,216        majorVersion,217        frame,218        reader.tell() + frame.size);219  } else if (frame.name.charAt(0) == 'T' || frame.name.charAt(0) == 'W') {220    this.readTextFrame_(221        reader,222        majorVersion,223        frame,224        reader.tell() + frame.size);225  }226  reader.popSeek();227  reader.seek(frame.size + frame.headerSize, ByteReader.SEEK_CUR);228  return frame;229};230/**231 * @param {File} file File object to parse.232 * @param {Object} metadata Metadata object of the file.233 * @param {function(Object)} callback Success callback.234 * @param {function(string)} onError Error callback.235 */236Id3Parser.prototype.parse = function(file, metadata, callback, onError) {237  var self = this;238  this.log('Starting id3 parser for ' + file.name);239  var id3v1Parser = new FunctionSequence(240      'id3v1parser',241      [242        /**243         * Reads last 128 bytes of file in bytebuffer,244         * which passes further.245         * In last 128 bytes should be placed ID3v1 tag if available.246         * @param {File} file File which bytes to read.247         */248        function readTail(file) {249          MetadataParser.readFileBytes(file, file.size - 128, file.size,250              this.nextStep, this.onError);251        },252        /**253         * Attempts to extract ID3v1 tag from 128 bytes long ByteBuffer254         * @param {File} file File which tags are being extracted. Could be used255         *     for logging purposes.256         * @param {ByteReader} reader ByteReader of 128 bytes.257         */258        function extractId3v1(file, reader) {259          if (reader.readString(3) == 'TAG') {260            this.logger.vlog('id3v1 found');261            var id3v1 = metadata.id3v1 = {};262            var title = reader.readNullTerminatedString(30).trim();263            if (title.length > 0) {264              metadata.title = title;265            }266            reader.seek(3 + 30, ByteReader.SEEK_BEG);267            var artist = reader.readNullTerminatedString(30).trim();268            if (artist.length > 0) {269              metadata.artist = artist;270            }271            reader.seek(3 + 30 + 30, ByteReader.SEEK_BEG);272            var album = reader.readNullTerminatedString(30).trim();273            if (album.length > 0) {274              metadata.album = album;275            }276          }277          this.nextStep();278        }279      ],280      this,281      function() {},282      function(error) {});283  var id3v2Parser = new FunctionSequence(284      'id3v2parser',285      [286        function readHead(file) {287          MetadataParser.readFileBytes(file, 0, 10, this.nextStep,288              this.onError);289        },290        /**291         * Check if passed array of 10 bytes contains ID3 header.292         * @param {File} file File to check and continue reading if ID3293         *     metadata found.294         * @param {ByteReader} reader Reader to fill with stream bytes.295         */296        function checkId3v2(file, reader) {297          if (reader.readString(3) == 'ID3') {298            this.logger.vlog('id3v2 found');299            var id3v2 = metadata.id3v2 = {};300            id3v2.major = reader.readScalar(1, false);301            id3v2.minor = reader.readScalar(1, false);302            id3v2.flags = reader.readScalar(1, false);303            id3v2.size = Id3Parser.readSynchSafe_(reader, 4);304            MetadataParser.readFileBytes(file, 10, 10 + id3v2.size,305                this.nextStep, this.onError);306          } else {307            this.finish();308          }309        },310        /**311         * Extracts all ID3v2 frames from given bytebuffer.312         * @param {File} file File being parsed.313         * @param {ByteReader} reader Reader to use for metadata extraction.314         */315        function extractFrames(file, reader) {316          var id3v2 = metadata.id3v2;317          if ((id3v2.major > 2) &&318              (id3v2.flags & Id3Parser.v2.FLAG_EXTENDED_HEADER != 0)) {319            // Skip extended header if found320            if (id3v2.major == 3) {321              reader.seek(reader.readScalar(4, false) - 4);322            } else if (id3v2.major == 4) {323              reader.seek(Id3Parser.readSynchSafe_(reader, 4) - 4);324            }325          }326          var frame;327          while (frame = self.readFrame_(reader, id3v2.major)) {328            metadata.id3v2[frame.name] = frame;329          }330          this.nextStep();331        },332        /**333         * Adds 'description' object to metadata.334         * 'description' used to unify different parsers and make335         * metadata parser-aware.336         * Description is array if value-type pairs. Type should be used337         * to properly format value before displaying to user.338         */339        function prepareDescription() {340          var id3v2 = metadata.id3v2;341          if (id3v2['APIC'])342            metadata.thumbnailURL = id3v2['APIC'].imageUrl;343          else if (id3v2['PIC'])344            metadata.thumbnailURL = id3v2['PIC'].imageUrl;345          metadata.description = [];346          for (var key in id3v2) {347            if (typeof(Id3Parser.v2.MAPPERS[key]) != 'undefined' &&348                id3v2[key].value.trim().length > 0) {349              metadata.description.push({350                key: Id3Parser.v2.MAPPERS[key],351                value: id3v2[key].value.trim()352              });353            }354          }355          /**356           * @param {string} propName357           * @param {...string} tags358           */359          function extract(propName, tags) {360            for (var i = 1; i != arguments.length; i++) {361              var tag = id3v2[arguments[i]];362              if (tag && tag.value) {363                metadata[propName] = tag.value;364                break;365              }366            }367          }368          extract('album', 'TALB', 'TAL');369          extract('title', 'TIT2', 'TT2');370          extract('artist', 'TPE1', 'TP1');371          metadata.description.sort(function(a, b) {372            return Id3Parser.METADATA_ORDER.indexOf(a.key) -373                   Id3Parser.METADATA_ORDER.indexOf(b.key);374          });375          this.nextStep();376        }377      ],378      this,379      function() {},380      function(error) {});381  var metadataParser = new FunctionParallel(382      'mp3metadataParser',383      [id3v1Parser, id3v2Parser],384      this,385      function() {386        callback.call(null, metadata);387      },388      onError);389  id3v1Parser.setCallback(metadataParser.nextStep);390  id3v2Parser.setCallback(metadataParser.nextStep);391  id3v1Parser.setFailureCallback(metadataParser.onError);392  id3v2Parser.setFailureCallback(metadataParser.onError);393  this.vlog('Passed argument : ' + file);394  metadataParser.start(file);395};396/**397 * Metadata order to use for metadata generation398 * @type {Array<string>}399 * @const400 */401Id3Parser.METADATA_ORDER = [402  'ID3_TITLE',403  'ID3_LEAD_PERFORMER',404  'ID3_YEAR',405  'ID3_ALBUM',406  'ID3_TRACK_NUMBER',407  'ID3_BPM',408  'ID3_COMPOSER',409  'ID3_DATE',410  'ID3_PLAYLIST_DELAY',411  'ID3_LYRICIST',412  'ID3_FILE_TYPE',413  'ID3_TIME',414  'ID3_LENGTH',415  'ID3_FILE_OWNER',416  'ID3_BAND',417  'ID3_COPYRIGHT',418  'ID3_OFFICIAL_AUDIO_FILE_WEBPAGE',419  'ID3_OFFICIAL_ARTIST',420  'ID3_OFFICIAL_AUDIO_SOURCE_WEBPAGE',421  'ID3_PUBLISHERS_OFFICIAL_WEBPAGE'422];423/**424 * Id3v1 constants.425 * @type {Object<*>}426 */427Id3Parser.v1 = {428  /**429   * Genres list as described in id3 documentation. We aren't going to430   * localize this list, because at least in Russian (and I think most431   * other languages), translation exists at least for 10% and most time432   * translation would degrade to transliteration.433   */434  GENRES: [435    'Blues',436    'Classic Rock',437    'Country',438    'Dance',439    'Disco',440    'Funk',441    'Grunge',442    'Hip-Hop',443    'Jazz',444    'Metal',445    'New Age',446    'Oldies',447    'Other',448    'Pop',449    'R&B',450    'Rap',451    'Reggae',452    'Rock',453    'Techno',454    'Industrial',455    'Alternative',456    'Ska',457    'Death Metal',458    'Pranks',459    'Soundtrack',460    'Euro-Techno',461    'Ambient',462    'Trip-Hop',463    'Vocal',464    'Jazz+Funk',465    'Fusion',466    'Trance',467    'Classical',468    'Instrumental',469    'Acid',470    'House',471    'Game',472    'Sound Clip',473    'Gospel',474    'Noise',475    'AlternRock',476    'Bass',477    'Soul',478    'Punk',479    'Space',480    'Meditative',481    'Instrumental Pop',482    'Instrumental Rock',483    'Ethnic',484    'Gothic',485    'Darkwave',486    'Techno-Industrial',487    'Electronic',488    'Pop-Folk',489    'Eurodance',490    'Dream',491    'Southern Rock',492    'Comedy',493    'Cult',494    'Gangsta',495    'Top 40',496    'Christian Rap',497    'Pop/Funk',498    'Jungle',499    'Native American',500    'Cabaret',501    'New Wave',502    'Psychadelic',503    'Rave',504    'Showtunes',505    'Trailer',506    'Lo-Fi',507    'Tribal',508    'Acid Punk',509    'Acid Jazz',510    'Polka',511    'Retro',512    'Musical',513    'Rock & Roll',514    'Hard Rock',515    'Folk',516    'Folk-Rock',517    'National Folk',518    'Swing',519    'Fast Fusion',520    'Bebob',521    'Latin',522    'Revival',523    'Celtic',524    'Bluegrass',525    'Avantgarde',526    'Gothic Rock',527    'Progressive Rock',528    'Psychedelic Rock',529    'Symphonic Rock',530    'Slow Rock',531    'Big Band',532    'Chorus',533    'Easy Listening',534    'Acoustic',535    'Humour',536    'Speech',537    'Chanson',538    'Opera',539    'Chamber Music',540    'Sonata',541    'Symphony',542    'Booty Bass',543    'Primus',544    'Porn Groove',545    'Satire',546    'Slow Jam',547    'Club',548    'Tango',549    'Samba',550    'Folklore',551    'Ballad',552    'Power Ballad',553    'Rhythmic Soul',554    'Freestyle',555    'Duet',556    'Punk Rock',557    'Drum Solo',558    'A capella',559    'Euro-House',560    'Dance Hall',561    'Goa',562    'Drum & Bass',563    'Club-House',564    'Hardcore',565    'Terror',566    'Indie',567    'BritPop',568    'Negerpunk',569    'Polsk Punk',570    'Beat',571    'Christian Gangsta Rap',572    'Heavy Metal',573    'Black Metal',574    'Crossover',575    'Contemporary Christian',576    'Christian Rock',577    'Merengue',578    'Salsa',579    'Thrash Metal',580    'Anime',581    'Jpop',582    'Synthpop'583  ]584};585/**586 * Id3v2 constants.587 * @type {Object<*>}588 */589Id3Parser.v2 = {590  FLAG_EXTENDED_HEADER: 1 << 5,591  ENCODING: {592    /**593     * ISO-8859-1 [ISO-8859-1]. Terminated with $00.594     *595     * @const596     * @type {number}597     */598    ISO_8859_1: 0,599    /**600     * [UTF-16] encoded Unicode [UNICODE] with BOM. All601     * strings in the same frame SHALL have the same byteorder.602     * Terminated with $00 00.603     *604     * @const605     * @type {number}606     */607    UTF_16: 1,608    /**609     * UTF-16BE [UTF-16] encoded Unicode [UNICODE] without BOM.610     * Terminated with $00 00.611     *612     * @const613     * @type {number}614     */615    UTF_16BE: 2,616    /**617     * UTF-8 [UTF-8] encoded Unicode [UNICODE]. Terminated with $00.618     *619     * @const620     * @type {number}621     */622    UTF_8: 3623  },624  HANDLERS: {625    //User defined text information frame626    TXX: Id3Parser.prototype.readUserDefinedTextFrame_,627    //User defined URL link frame628    WXX: Id3Parser.prototype.readUserDefinedTextFrame_,629    //User defined text information frame630    TXXX: Id3Parser.prototype.readUserDefinedTextFrame_,631    //User defined URL link frame632    WXXX: Id3Parser.prototype.readUserDefinedTextFrame_,633    //User attached image634    PIC: Id3Parser.prototype.readPIC_,635    //User attached image636    APIC: Id3Parser.prototype.readAPIC_637  },638  MAPPERS: {639    TALB: 'ID3_ALBUM',640    TBPM: 'ID3_BPM',641    TCOM: 'ID3_COMPOSER',642    TDAT: 'ID3_DATE',643    TDLY: 'ID3_PLAYLIST_DELAY',644    TEXT: 'ID3_LYRICIST',645    TFLT: 'ID3_FILE_TYPE',646    TIME: 'ID3_TIME',647    TIT2: 'ID3_TITLE',648    TLEN: 'ID3_LENGTH',649    TOWN: 'ID3_FILE_OWNER',650    TPE1: 'ID3_LEAD_PERFORMER',651    TPE2: 'ID3_BAND',652    TRCK: 'ID3_TRACK_NUMBER',653    TYER: 'ID3_YEAR',654    WCOP: 'ID3_COPYRIGHT',655    WOAF: 'ID3_OFFICIAL_AUDIO_FILE_WEBPAGE',656    WOAR: 'ID3_OFFICIAL_ARTIST',657    WOAS: 'ID3_OFFICIAL_AUDIO_SOURCE_WEBPAGE',658    WPUB: 'ID3_PUBLISHERS_OFFICIAL_WEBPAGE'659  }660};...

id3.js

Source:id3.js

1/**2 * ID3 parser3 */4 class ID3 {5  /**6   * Returns true if an ID3 header can be found at offset in data7   * @param {Uint8Array} data - The data to search in8   * @param {number} offset - The offset at which to start searching9   * @return {boolean} - True if an ID3 header is found10   */11  static isHeader(data, offset) {12    /*13    * http://id3.org/id3v2.3.014    * [0]     = 'I'15    * [1]     = 'D'16    * [2]     = '3'17    * [3,4]   = {Version}18    * [5]     = {Flags}19    * [6-9]   = {ID3 Size}20    *21    * An ID3v2 tag can be detected with the following pattern:22    *  $49 44 33 yy yy xx zz zz zz zz23    * Where yy is less than $FF, xx is the 'flags' byte and zz is less than $8024    */25    if (offset + 10 <= data.length) {26      //look for 'ID3' identifier27      if (data[offset] === 0x49 && data[offset+1] === 0x44 && data[offset+2] === 0x33) {28        //check version is within range29        if (data[offset+3] < 0xFF && data[offset+4] < 0xFF) {30          //check size is within range31          if (data[offset+6] < 0x80 && data[offset+7] < 0x80 && data[offset+8] < 0x80 && data[offset+9] < 0x80) {32            return true;33          }34        }35      }36    }37    return false;38  }39  /**40   * Returns true if an ID3 footer can be found at offset in data41   * @param {Uint8Array} data - The data to search in42   * @param {number} offset - The offset at which to start searching43   * @return {boolean} - True if an ID3 footer is found44   */45  static isFooter(data, offset) {46    /*47    * The footer is a copy of the header, but with a different identifier48    */49    if (offset + 10 <= data.length) {50      //look for '3DI' identifier51      if (data[offset] === 0x33 && data[offset+1] === 0x44 && data[offset+2] === 0x49) {52        //check version is within range53        if (data[offset+3] < 0xFF && data[offset+4] < 0xFF) {54          //check size is within range55          if (data[offset+6] < 0x80 && data[offset+7] < 0x80 && data[offset+8] < 0x80 && data[offset+9] < 0x80) {56            return true;57          }58        }59      }60    }61    return false;62  }63  /**64   * Returns any adjacent ID3 tags found in data starting at offset, as one block of data65   * @param {Uint8Array} data - The data to search in66   * @param {number} offset - The offset at which to start searching67   * @return {Uint8Array} - The block of data containing any ID3 tags found68   */69  static getID3Data(data, offset) {70    const front = offset;71    let length = 0;72    while (ID3.isHeader(data, offset)) {73      //ID3 header is 10 bytes74      length += 10;75      const size = ID3._readSize(data, offset + 6);76      length += size;77      if (ID3.isFooter(data, offset + 10)) {78        //ID3 footer is 10 bytes79        length += 10;80      }81      offset += length;82    }83    if (length > 0) {84      return data.subarray(front, front + length);85    }86    return undefined;87  }88  static _readSize(data, offset) {89    let size = 0;90    size  = ((data[offset]   & 0x7f) << 21);91    size |= ((data[offset+1] & 0x7f) << 14);92    size |= ((data[offset+2] & 0x7f) << 7);93    size |=  (data[offset+3] & 0x7f);94    return size;95  }96  /**97   * Searches for the Elementary Stream timestamp found in the ID3 data chunk98   * @param {Uint8Array} data - Block of data containing one or more ID3 tags99   * @return {number} - The timestamp100   */101  static getTimeStamp(data) {102    const frames = ID3.getID3Frames(data);103    for(let i = 0; i < frames.length; i++) {104      const frame = frames[i];105      if (ID3.isTimeStampFrame(frame)) {106        return ID3._readTimeStamp(frame);107      }108    }109    return undefined;110  }111  /**112   * Returns true if the ID3 frame is an Elementary Stream timestamp frame113   * @param {ID3 frame} frame114   */115  static isTimeStampFrame(frame) {116    return (frame && frame.key === 'PRIV' && frame.info === 'com.apple.streaming.transportStreamTimestamp');117  }118  static _getFrameData(data) {119    /*120    Frame ID       $xx xx xx xx (four characters)121    Size           $xx xx xx xx122    Flags          $xx xx123    */124    const type = String.fromCharCode(data[0], data[1], data[2], data[3]);125    const size = ID3._readSize(data, 4);126    //skip frame id, size, and flags127    let offset = 10;128    return { type, size, data: data.subarray(offset, offset + size) };129  }130  /**131   * Returns an array of ID3 frames found in all the ID3 tags in the id3Data132   * @param {Uint8Array} id3Data - The ID3 data containing one or more ID3 tags133   * @return {ID3 frame[]} - Array of ID3 frame objects134   */135  static getID3Frames(id3Data) {136    let offset = 0;137    const frames = [];138    while (ID3.isHeader(id3Data, offset)) {139      const size = ID3._readSize(id3Data, offset + 6);140      //skip past ID3 header141      offset += 10;142      const end = offset + size;143      //loop through frames in the ID3 tag144      while (offset + 8 < end) {145        const frameData = ID3._getFrameData(id3Data.subarray(offset));146        const frame = ID3._decodeFrame(frameData);147        if (frame) {148          frames.push(frame);149        }150        //skip frame header and frame data151        offset += frameData.size + 10;152      }153      if (ID3.isFooter(id3Data, offset)) {154        offset += 10;155      }156    }157    return frames;158  }159  static _decodeFrame(frame) {160    if (frame.type === 'PRIV') {161      return ID3._decodePrivFrame(frame);162    } else if (frame.type[0] === 'T') {163      return ID3._decodeTextFrame(frame);164    } else if (frame.type[0] === 'W') {165      return ID3._decodeURLFrame(frame);166    }167    return undefined;168  }169  static _readTimeStamp(timeStampFrame) {170    if (timeStampFrame.data.byteLength === 8) {171      const data = new Uint8Array(timeStampFrame.data);172      // timestamp is 33 bit expressed as a big-endian eight-octet number,173      // with the upper 31 bits set to zero.174      const pts33Bit = data[3] & 0x1;175      let timestamp = (data[4] << 23) +176                      (data[5] << 15) +177                      (data[6] <<  7) +178                       data[7];179      timestamp /= 45;180      if (pts33Bit) {181        timestamp += 47721858.84; // 2^32 / 90182      }183      return Math.round(timestamp);184    }185    return undefined;186  }187  static _decodePrivFrame(frame) {188    /*189    Format: <text string>\0<binary data>190    */191    if (frame.size < 2) {192      return undefined;193    }194    const owner = ID3._utf8ArrayToStr(frame.data);195    const privateData = new Uint8Array(frame.data.subarray(owner.length + 1));196    return { key: frame.type, info: owner, data: privateData.buffer };197  }198  static _decodeTextFrame(frame) {199    if (frame.size < 2) {200      return undefined;201    }202    if (frame.type === 'TXXX') {203      /*204      Format:205      [0]   = {Text Encoding}206      [1-?] = {Description}\0{Value}207      */208      let index = 1;209      const description = ID3._utf8ArrayToStr(frame.data.subarray(index));210      index += description.length + 1;211      const value = ID3._utf8ArrayToStr(frame.data.subarray(index));212      return { key: frame.type, info: description, data: value };213    } else {214      /*215      Format:216      [0]   = {Text Encoding}217      [1-?] = {Value}218      */219      const text = ID3._utf8ArrayToStr(frame.data.subarray(1));220      return { key: frame.type, data: text };221    }222  }223  static _decodeURLFrame(frame) {224    if (frame.type === 'WXXX') {225      /*226      Format:227      [0]   = {Text Encoding}228      [1-?] = {Description}\0{URL}229      */230      if (frame.size < 2) {231        return undefined;232      }233      let index = 1;234      const description = ID3._utf8ArrayToStr(frame.data.subarray(index));235      index += description.length + 1;236      const value = ID3._utf8ArrayToStr(frame.data.subarray(index));237      return { key: frame.type, info: description, data: value };238    } else {239      /*240      Format:241      [0-?] = {URL}242      */243      const url = ID3._utf8ArrayToStr(frame.data);244      return { key: frame.type, data: url };245    }246  }247  // http://stackoverflow.com/questions/8936984/uint8array-to-string-in-javascript/22373197248  // http://www.onicos.com/staff/iz/amuse/javascript/expert/utf.txt249  /* utf.js - UTF-8 <=> UTF-16 convertion250   *251   * Copyright (C) 1999 Masanao Izumo <iz@onicos.co.jp>252   * Version: 1.0253   * LastModified: Dec 25 1999254   * This library is free.  You can redistribute it and/or modify it.255   */256  static _utf8ArrayToStr(array) {257    let char2;258    let char3;259    let out = '';260    let i = 0;261    let length = array.length;262    while (i < length) {263      let c = array[i++];264      switch (c >> 4) {265        case 0:266          return out;267        case 1: case 2: case 3: case 4: case 5: case 6: case 7:268          // 0xxxxxxx269          out += String.fromCharCode(c);270          break;271        case 12: case 13:272          // 110x xxxx   10xx xxxx273          char2 = array[i++];274          out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));275          break;276        case 14:277          // 1110 xxxx  10xx xxxx  10xx xxxx278          char2 = array[i++];279          char3 = array[i++];280          out += String.fromCharCode(((c & 0x0F) << 12) |281            ((char2 & 0x3F) << 6) |282            ((char3 & 0x3F) << 0));283          break;284      }285    }286    return out;287  }288}...

common.js

Source:common.js

1window.addEventListener("load", loader, false);2function loader(){3		var liElems = document.getElementsByTagName("li");4		var iElem,										// Elem <i>5				liElem,										// Elem <li>6				ulElem,										// Elem <Ul>7				liElemIdFest,8				liElemIdLast;9		var arrayItemsLiId = [];10		document.addEventListener("click", clickItem, false);11		function clickItem(e){											// event target12			var iElem = e.target;13			var liElem = e.target.parentNode;14			var liElemId = liElem.id;15			var liElemIdFest = +liElemId.charAt(liElemId.length - 2);		//penultimate number id Item - Li16			var liElemIdLast = +liElemId.charAt(liElemId.length - 1);		//last nomber id Item - Li17			matrixSquea(liElemIdFest, liElemIdLast);18			function matrixSquea(liId3, liId4) {19				if (liId3 === 0 && liId4 === 0){20						target(liId3, liId4);21						right(liId3, liId4);22						down(liId3, liId4);23						//console.log("target: " + liId3 + " - " + typeof(liId3) + ", " + liId4 + " - "+ typeof(liId4));24					} else if (liId3 === 6 && liId4 === 0){25						target(liId3, liId4);26						right(liId3, liId4);27						up(liId3, liId4);28						//console.log("target: " + liId3 + " - " + typeof(liId3) + ", " + liId4 + " - "+ typeof(liId4));29					} else if (liId3 === 0 && liId4 === 5){30						target(liId3, liId4);31						left(liId3, liId4);32						down(liId3, liId4);33						//console.log("target: " + liId3 + " - " + typeof(liId3) + ", " + liId4 + " - "+ typeof(liId4));34					} else if (liId3 === 6 && liId4 === 5){35						target(liId3, liId4);36						left(liId3, liId4);37						up(liId3, liId4);38						//console.log("target: " + liId3 + " - " + typeof(liId3) + ", " + liId4 + " - "+ typeof(liId4));39					} else if (liId3 && liId4 === 0){40						target(liId3, liId4);41						up(liId3, liId4);42						down(liId3, liId4);43						right(liId3, liId4);44						//console.log("target: " + liId3 + " - " + typeof(liId3) + ", " + liId4 + " - "+ typeof(liId4));45					} else if (liId3 && liId4 === 5){46						target(liId3, liId4);47						up(liId3, liId4);48						down(liId3, liId4);49						left(liId3, liId4);50						//console.log("target: " + liId3 + " - " + typeof(liId3) + ", " + liId4 + " - "+ typeof(liId4));51					} else if (liId3 === 0 && liId4){52						target(liId3, liId4);53						left(liId3, liId4);54						right(liId3, liId4);55						down(liId3, liId4);56						//console.log("target: " + liId3 + " - " + typeof(liId3) + ", " + liId4 + " - "+ typeof(liId4));57					} else if (liId3 === 6 && liId4){58						target(liId3, liId4);59						left(liId3, liId4);60						right(liId3, liId4);61						up(liId3, liId4);62						//console.log("target: " + liId3 + " - " + typeof(liId3) + ", " + liId4 + " - "+ typeof(liId4));63					} else if (liId3 && liId4){64						target(liId3, liId4);65						left(liId3, liId4);66						right(liId3, liId4);67						up(liId3, liId4);68						down(liId3, liId4);69						//console.log("target: " + liId3 + " - " + typeof(liId3) + ", " + liId4 + " - "+ typeof(liId4));70					}71			}72			function target(elemFest, elemLast) {												//Target Element 73				//console.log("target - " + elemFest + " " + elemLast);74				newItemTarget= "li" + elemFest + elemLast;75				verifyItemDel(newItemTarget);76			}77			function left(elemFest, elemLast) {													//Element from Left Side78				var elemLast = elemLast - 1;79				//console.log("left - " + elemFest + " - " + typeof(elemFest) + " , " + elemLast + " - " + typeof(elemLast));80				newItemLeft= "li" + elemFest + elemLast;81				verifyItemDel(newItemLeft);82			}83			function right(elemFest, elemLast) {												//Element from Rite Side84				var elemLast = elemLast + 1;85				//console.log("right - " + elemFest + " - " + typeof(elemFest) + " , " + elemLast + " - " + typeof(elemLast));86				newItemRight= "li" + elemFest + elemLast87				verifyItemDel(newItemRight);88				}89			function up(elemFest, elemLast) {														//Element from the top (up)90				var elemFest = elemFest - 1;91				//console.log("up - " + elemFest + " - " + typeof(elemFest) + " , " + elemLast + " - " + typeof(elemLast));92				newItemUp= "li" + elemFest + elemLast93				verifyItemDel(newItemUp);94			}95			function down(elemFest, elemLast) {													//Element from the bottom96				var elemFest = elemFest + 1;97				//console.log("down - " + elemFest + " - " + typeof(elemFest) + " , " + elemLast + " - " + typeof(elemLast));98				newItemDown= "li" + elemFest + elemLast99				verifyItemDel(newItemDown);100			}101			function verifyItemDel(liid) {															//Verify Element by className and id102				for (var i = 0; i<liElems.length; i++) {103					if (liElems[i].id === liid && liElems[i].firstChild.className === iElem.className){104						liElems[i].firstChild.style.display = "none";105						//liElems[i].style.background = "red";106						verifyPush(liid)107					}108				}109			}110			function verifyPush(liIdPush) {															//Push Elements to Array, and verify to unique 111				if (arrayItemsLiId.indexOf(liIdPush) === -1) {112					arrayItemsLiId.push(liIdPush);113					arrayItems();114				}115			}116			function arrayItems() {																			// All elements of Array is verify, and extracting 2 last numbers117					for (var key in arrayItemsLiId) {118						if (arrayItemsLiId.hasOwnProperty(key)) {119							//console.log( arrayItemsLiId[key]+ " , " + typeof(arrayItemsLiId[key]) + " new version verify" );120							var liElemIdUpFast = +arrayItemsLiId[key].charAt(arrayItemsLiId[key].length - 2);121							var liElemIdUpLast = +arrayItemsLiId[key].charAt(arrayItemsLiId[key].length - 1);122							//console.log(liElemIdUpFast + " - " + typeof(liElemIdUpFast) + " , " + liElemIdUpLast + " - " + typeof(liElemIdUpLast));123							matrixSquea(liElemIdUpFast, liElemIdUpLast)124						}125					}126			}127		};...

Using AI Code Generation

1var tracetest = require('tracetest');2var id3 = tracetest.id3;3var id3 = tracetest.id3;4var id3 = tracetest.id3;5var id3 = tracetest.id3;6var id4 = tracetest.id4;7var id4 = tracetest.id4;8var id4 = tracetest.id4;9var id4 = tracetest.id4;10var id5 = tracetest.id5;11var id5 = tracetest.id5;12var id5 = tracetest.id5;13var id5 = tracetest.id5;14var id6 = tracetest.id6;15var id6 = tracetest.id6;16var id6 = tracetest.id6;17var id6 = tracetest.id6;18var id7 = tracetest.id7;19var id7 = tracetest.id7;20var id7 = tracetest.id7;21var id7 = tracetest.id7;22var id8 = tracetest.id8;23var id8 = tracetest.id8;24var id8 = tracetest.id8;25var id8 = tracetest.id8;26var id9 = tracetest.id9;27var id9 = tracetest.id9;28var id9 = tracetest.id9;29var id9 = tracetest.id9;30var id10 = tracetest.id10;31var id10 = tracetest.id10;32var id10 = tracetest.id10;33var id10 = tracetest.id10;34var id11 = tracetest.id11;35var id11 = tracetest.id11;36var id11 = tracetest.id11;37var id11 = tracetest.id11;38var id12 = tracetest.id12;

Using AI Code Generation

1var tracetest = require('tracetest');2tracetest.id3();3var id3 = function() {4  console.log('id3');5}6exports.id3 = id3;7    at Function.Module._resolveFilename (module.js:338:15)8    at Function.Module._load (module.js:280:25)9    at Module.require (module.js:364:17)10    at require (module.js:380:17)11    at Object. (/home/robert/Projects/nodejs/test.js:2:14)12    at Module._compile (module.js:456:26)13    at Object.Module._extensions..js (module.js:474:10)14    at Module.load (module.js:356:32)15    at Function.Module._load (module.js:312:12)16    at Function.Module.runMain (module.js:497:10)

Using AI Code Generation

1var trace = require('tracetest');2trace.id3(3, 4);3exports.id3 = function(a, b) {4    console.log(a + b);5};6var trace = require('tracetest');7var sum = trace.sum(3, 4);8console.log(sum);9exports.sum = function(a, b) {10    return a + b;11};12var trace = require('tracetest');13var sum = trace.testObj.sum(3, 4);14console.log(sum);15exports.testObj = {16    sum: function(a, b) {17        return a + b;18    }19};20var trace = require('tracetest');21var sum = trace.testObj.sum(3, 4);22console.log(sum);23function Test() {24    this.sum = function(a, b) {25        return a + b;26    }27    this.sub = function(a, b) {

Using AI Code Generation

1var trace = require('tracetest');2trace.id3("Hello World");3exports.id3 = function(id3) {4    console.log(id3);5}6delete require.cache[require.resolve('./tracetest.js')];

Using AI Code Generation

1var tracetest = require('./tracetest');2var id3 = tracetest.id3;3function foo() {4    var stack = id3();5    console.log(stack);6}7function bar() {8    foo();9}10bar();11var id = 0;12function id1() {13    return id++;14}15function id2() {16    return id++;17}18function id3() {19    return id++;20}21exports.id1 = id1;22exports.id2 = id2;23exports.id3 = id3;24var tracetest = require('./tracetest');25var id3 = tracetest.id3;26function foo() {27    var stack = id3();28    console.log(stack);29}30function bar() {31    foo();32}33bar();

Using AI Code Generation

1var id3 = require('./id3.js');2var mp3file = 'test.mp3';3id3({ file: mp3file, type: id3.OPEN_LOCAL }, function(err, tags) {4    console.log(tags);5});6var id3 = require('./id3');

Using AI Code Generation

1var id3 = require('id3js');2var path = require('path');3var fs = require('fs');4var path = require('path');5var dir = 'C:\\Users\\Admin\\Desktop\\Music\\';6var files = fs.readdirSync(dir);7var FILENAME = "C:\\Users\\Admin\\Desktop\\Music\\";8var FILENAME2 = "C:\\Users\\Admin\\Desktop\\Music\\";9var FILENAME3 = "C:\\Users\\Admin\\Desktop\\Music\\";10var FILENAME4 = "C:\\Users\\Admin\\Desktop\\Music\\";11var FILENAME5 = "C:\\Users\\Admin\\Desktop\\Music\\";12var FILENAME6 = "C:\\Users\\Admin\\Desktop\\Music\\";13var file = "C:\\Users\\Admin\\Desktop\\Music\\";14var file2 = "C:\\Users\\Admin\\Desktop\\Music\\";15var file3 = "C:\\Users\\Admin\\Desktop\\Music\\";16var file4 = "C:\\Users\\Admin\\Desktop\\Music\\";17var file5 = "C:\\Users\\Admin\\Desktop\\Music\\";18var file6 = "C:\\Users\\Admin\\Desktop\\Music\\";19var file7 = "C:\\Users\\Admin\\Desktop\\Music\\";20var file8 = "C:\\Users\\Admin\\Desktop\\Music\\";21var file9 = "C:\\Users\\Admin\\Desktop\\Music\\";22var file10 = "C:\\Users\\Admin\\Desktop\\Music\\";23var file11 = "C:\\Users\\Admin\\Desktop\\Music\\";24var file12 = "C:\\Users\\Admin\\Desktop\\Music\\";25var file13 = "C:\\Users\\Admin\\Desktop\\Music\\";26var file14 = "C:\\Users\\Admin\\Desktop\\Music\\";

Using AI Code Generation

1gulp.task('build', ['clean'], function() {2    return gulp.src(['app/**/*', '!app/**/*.js'])3        .pipe(gulp.dest('dist'))4        .pipe(plugins.uglify())5        .pipe(gulp.dest('dist'));6});7gulp.task('build', ['clean'], function() {8    return gulp.src(['app/**/*', '!app/**/*.js'])9        .pipe(gulp.dest('dist'))10        .pipe(plugins.uglify())11        .pipe(gulp.dest('dist'));12});13gulp.task('build', ['clean'], function() {14    return gulp.src(['app/**/*', '!app/**/*.js'])15        .pipe(gulp.dest('dist'))16        .pipe(plugins.uglify())17        .pipe(gulp.dest('dist'));18});19gulp.task('build', ['clean'], function() {20    return gulp.src(['app/**/*', '!app/**/*.js'])21        .pipe(gulp.dest('dist'))22        .pipe(plugins.uglify())23        .pipe(gulp.dest('dist'));24});25gulp.task('build', ['clean'], function() {26    return gulp.src(['app/**/*', '!app/**/*.js'])27        .pipe(gulp.dest('dist'))

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.