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ID3 Extractor Added.
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n1073645
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src/core/operations/ExtractID3.mjs
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301
src/core/operations/ExtractID3.mjs
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/**
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* @author n1073645 [n1073645@gmail.com]
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* @copyright Crown Copyright 2020
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* @license Apache-2.0
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*/
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import Operation from "../Operation.mjs";
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import OperationError from "../errors/OperationError.mjs";
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/**
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* Extract ID3 operation
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*/
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class ExtractID3 extends Operation {
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/**
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* ExtractID3 constructor
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*/
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constructor() {
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super();
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this.name = "Extract ID3";
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this.module = "Default";
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this.description = "";
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this.infoURL = "";
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this.inputType = "ArrayBuffer";
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this.outputType = "string";
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this.args = [];
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}
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/**
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* @param {ArrayBuffer} input
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* @param {Object[]} args
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* @returns {string}
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*/
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run(input, args) {
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// Borrowed from https://github.com/aadsm/jsmediatags
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const FRAME_DESCRIPTIONS = {
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// v2.2
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"BUF": "Recommended buffer size",
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"CNT": "Play counter",
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"COM": "Comments",
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"CRA": "Audio encryption",
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"CRM": "Encrypted meta frame",
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"ETC": "Event timing codes",
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"EQU": "Equalization",
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"GEO": "General encapsulated object",
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"IPL": "Involved people list",
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"LNK": "Linked information",
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"MCI": "Music CD Identifier",
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"MLL": "MPEG location lookup table",
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"PIC": "Attached picture",
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"POP": "Popularimeter",
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"REV": "Reverb",
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"RVA": "Relative volume adjustment",
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"SLT": "Synchronized lyric/text",
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"STC": "Synced tempo codes",
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"TAL": "Album/Movie/Show title",
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"TBP": "BPM (Beats Per Minute)",
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"TCM": "Composer",
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"TCO": "Content type",
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"TCR": "Copyright message",
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"TDA": "Date",
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"TDY": "Playlist delay",
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"TEN": "Encoded by",
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"TFT": "File type",
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"TIM": "Time",
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"TKE": "Initial key",
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"TLA": "Language(s)",
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"TLE": "Length",
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"TMT": "Media type",
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"TOA": "Original artist(s)/performer(s)",
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"TOF": "Original filename",
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"TOL": "Original Lyricist(s)/text writer(s)",
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"TOR": "Original release year",
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"TOT": "Original album/Movie/Show title",
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"TP1": "Lead artist(s)/Lead performer(s)/Soloist(s)/Performing group",
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"TP2": "Band/Orchestra/Accompaniment",
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"TP3": "Conductor/Performer refinement",
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"TP4": "Interpreted, remixed, or otherwise modified by",
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"TPA": "Part of a set",
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"TPB": "Publisher",
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"TRC": "ISRC (International Standard Recording Code)",
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"TRD": "Recording dates",
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"TRK": "Track number/Position in set",
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"TSI": "Size",
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"TSS": "Software/hardware and settings used for encoding",
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"TT1": "Content group description",
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"TT2": "Title/Songname/Content description",
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"TT3": "Subtitle/Description refinement",
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"TXT": "Lyricist/text writer",
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"TXX": "User defined text information frame",
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"TYE": "Year",
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"UFI": "Unique file identifier",
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"ULT": "Unsychronized lyric/text transcription",
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"WAF": "Official audio file webpage",
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"WAR": "Official artist/performer webpage",
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"WAS": "Official audio source webpage",
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"WCM": "Commercial information",
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"WCP": "Copyright/Legal information",
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"WPB": "Publishers official webpage",
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"WXX": "User defined URL link frame",
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// v2.3
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"AENC": "Audio encryption",
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"APIC": "Attached picture",
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"ASPI": "Audio seek point index",
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"CHAP": "Chapter",
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"CTOC": "Table of contents",
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"COMM": "Comments",
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"COMR": "Commercial frame",
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"ENCR": "Encryption method registration",
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"EQU2": "Equalisation (2)",
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"EQUA": "Equalization",
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"ETCO": "Event timing codes",
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"GEOB": "General encapsulated object",
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"GRID": "Group identification registration",
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"IPLS": "Involved people list",
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"LINK": "Linked information",
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"MCDI": "Music CD identifier",
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"MLLT": "MPEG location lookup table",
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"OWNE": "Ownership frame",
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"PRIV": "Private frame",
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"PCNT": "Play counter",
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"POPM": "Popularimeter",
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"POSS": "Position synchronisation frame",
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"RBUF": "Recommended buffer size",
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"RVA2": "Relative volume adjustment (2)",
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"RVAD": "Relative volume adjustment",
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"RVRB": "Reverb",
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"SEEK": "Seek frame",
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"SYLT": "Synchronized lyric/text",
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"SYTC": "Synchronized tempo codes",
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"TALB": "Album/Movie/Show title",
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"TBPM": "BPM (beats per minute)",
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"TCOM": "Composer",
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"TCON": "Content type",
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"TCOP": "Copyright message",
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"TDAT": "Date",
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"TDLY": "Playlist delay",
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"TDRC": "Recording time",
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"TDRL": "Release time",
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"TDTG": "Tagging time",
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"TENC": "Encoded by",
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"TEXT": "Lyricist/Text writer",
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"TFLT": "File type",
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"TIME": "Time",
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"TIPL": "Involved people list",
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"TIT1": "Content group description",
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"TIT2": "Title/songname/content description",
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"TIT3": "Subtitle/Description refinement",
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"TKEY": "Initial key",
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"TLAN": "Language(s)",
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"TLEN": "Length",
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"TMCL": "Musician credits list",
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"TMED": "Media type",
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"TMOO": "Mood",
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"TOAL": "Original album/movie/show title",
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"TOFN": "Original filename",
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"TOLY": "Original lyricist(s)/text writer(s)",
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"TOPE": "Original artist(s)/performer(s)",
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"TORY": "Original release year",
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"TOWN": "File owner/licensee",
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"TPE1": "Lead performer(s)/Soloist(s)",
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"TPE2": "Band/orchestra/accompaniment",
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"TPE3": "Conductor/performer refinement",
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"TPE4": "Interpreted, remixed, or otherwise modified by",
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"TPOS": "Part of a set",
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"TPRO": "Produced notice",
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"TPUB": "Publisher",
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"TRCK": "Track number/Position in set",
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"TRDA": "Recording dates",
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"TRSN": "Internet radio station name",
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"TRSO": "Internet radio station owner",
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"TSOA": "Album sort order",
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"TSOP": "Performer sort order",
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"TSOT": "Title sort order",
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"TSIZ": "Size",
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"TSRC": "ISRC (international standard recording code)",
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"TSSE": "Software/Hardware and settings used for encoding",
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"TSST": "Set subtitle",
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"TYER": "Year",
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"TXXX": "User defined text information frame",
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"UFID": "Unique file identifier",
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"USER": "Terms of use",
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"USLT": "Unsychronized lyric/text transcription",
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"WCOM": "Commercial information",
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"WCOP": "Copyright/Legal information",
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"WOAF": "Official audio file webpage",
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"WOAR": "Official artist/performer webpage",
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"WOAS": "Official audio source webpage",
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"WORS": "Official internet radio station homepage",
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"WPAY": "Payment",
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"WPUB": "Publishers official webpage",
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"WXXX": "User defined URL link frame"
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};
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input = new Uint8Array(input);
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let result = "";
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/**
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* Extracts the ID3 header fields.
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*/
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function extractHeader() {
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if (input.slice(0, 3).toString() !== [0x49, 0x44, 0x33].toString())
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throw new OperationError("No valid ID3 header.");
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result = "{\n";
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result += " Type: \"ID3\",\n";
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// Tag version.
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result += " Version: \"" + input[3].toString() + "." + input[4].toString() + "\",\n";
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// Header flags.
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result += " Flags: " + input[5].toString() + ",\n";
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input = input.slice(6);
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}
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/**
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* Converts the size fields to a single integer.
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*
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* @param {number} num
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* @returns {string}
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*/
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function readSize(num) {
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let result = 0;
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// The sizes are 7 bit numbers stored in 8 bit locations.
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for (let i = (num) * 7; i; i -= 7) {
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result = (result << i) | input[0];
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input = input.slice(1);
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}
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return result;
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}
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/**
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* Reads frame header based on ID.
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*
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* @param {string} id
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* @returns {number}
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*/
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function readFrame(id) {
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result += " " + id + ": {\n";
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result += " ID: \"" + id + "\",\n";
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// Size of frame.
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const size = readSize(4);
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result += " Size: " + size.toString() + ",\n";
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result += " Description: \"" + FRAME_DESCRIPTIONS[id] + "\",\n";
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input = input.slice(2);
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let data = "";
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// Read data from frame.
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for (let i = 1; i < size; i++)
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data += String.fromCharCode(input[i]);
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// Move to next Frame
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input = input.slice(size);
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result += " Data: \"" + data + "\",\n";
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result += " },\n";
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return size;
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}
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extractHeader();
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const headerTagSize = readSize(4);
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result += " Tags: {\n";
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let pos = 10;
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// While the current element is in the header.
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while (pos < headerTagSize) {
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// Frame Identifier of frame.
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let id = String.fromCharCode(input[0]) + String.fromCharCode(input[1]) + String.fromCharCode(input[2]);
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input = input.slice(3);
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// If the next character is non-zero it is an identifier.
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if (input[0] !== 0) {
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id += String.fromCharCode(input[0]);
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}
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input = input.slice(1);
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if (id in FRAME_DESCRIPTIONS) {
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pos += 10 + readFrame(id);
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// If end of header.
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} else if (id === "\x00\x00\x00") {
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break;
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} else {
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throw new OperationError("Unknown Frame Identifier: " + id);
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}
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}
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// Tidy up the output.
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result += " },\n";
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result += " Size: "+headerTagSize.toString() + ",\n";
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result += "}";
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return result;
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}
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}
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export default ExtractID3;
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