91 lines
3.6 KiB
JavaScript
91 lines
3.6 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.scanAppendingHeaders = exports.selectCover = exports.ratingToStars = exports.orderTags = exports.parseFromTokenizer = exports.parseBuffer = exports.parseStream = void 0;
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const strtok3 = require("strtok3/lib/core");
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const ParserFactory_1 = require("./ParserFactory");
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const RandomUint8ArrayReader_1 = require("./common/RandomUint8ArrayReader");
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const APEv2Parser_1 = require("./apev2/APEv2Parser");
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const ID3v1Parser_1 = require("./id3v1/ID3v1Parser");
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const Lyrics3_1 = require("./lyrics3/Lyrics3");
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/**
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* Parse audio from Node Stream.Readable
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* @param stream - Stream to read the audio track from
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* @param options - Parsing options
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* @param fileInfo - File information object or MIME-type string
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* @returns Metadata
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*/
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function parseStream(stream, fileInfo, options = {}) {
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return parseFromTokenizer(strtok3.fromStream(stream, typeof fileInfo === 'string' ? { mimeType: fileInfo } : fileInfo), options);
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}
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exports.parseStream = parseStream;
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/**
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* Parse audio from Node Buffer
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* @param uint8Array - Uint8Array holding audio data
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* @param fileInfo - File information object or MIME-type string
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* @param options - Parsing options
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* @returns Metadata
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* Ref: https://github.com/Borewit/strtok3/blob/e6938c81ff685074d5eb3064a11c0b03ca934c1d/src/index.ts#L15
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*/
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async function parseBuffer(uint8Array, fileInfo, options = {}) {
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const bufferReader = new RandomUint8ArrayReader_1.RandomUint8ArrayReader(uint8Array);
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await scanAppendingHeaders(bufferReader, options);
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const tokenizer = strtok3.fromBuffer(uint8Array, typeof fileInfo === 'string' ? { mimeType: fileInfo } : fileInfo);
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return parseFromTokenizer(tokenizer, options);
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}
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exports.parseBuffer = parseBuffer;
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/**
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* Parse audio from ITokenizer source
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* @param tokenizer - Audio source implementing the tokenizer interface
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* @param options - Parsing options
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* @returns Metadata
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*/
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function parseFromTokenizer(tokenizer, options) {
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return ParserFactory_1.ParserFactory.parseOnContentType(tokenizer, options);
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}
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exports.parseFromTokenizer = parseFromTokenizer;
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/**
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* Create a dictionary ordered by their tag id (key)
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* @param nativeTags list of tags
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* @returns tags indexed by id
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*/
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function orderTags(nativeTags) {
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const tags = {};
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for (const tag of nativeTags) {
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(tags[tag.id] = (tags[tag.id] || [])).push(tag.value);
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}
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return tags;
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}
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exports.orderTags = orderTags;
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/**
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* Convert rating to 1-5 star rating
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* @param rating: Normalized rating [0..1] (common.rating[n].rating)
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* @returns Number of stars: 1, 2, 3, 4 or 5 stars
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*/
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function ratingToStars(rating) {
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return rating === undefined ? 0 : 1 + Math.round(rating * 4);
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}
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exports.ratingToStars = ratingToStars;
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/**
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* Select most likely cover image.
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* @param pictures Usually metadata.common.picture
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* @return Cover image, if any, otherwise null
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*/
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function selectCover(pictures) {
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return pictures ? pictures.reduce((acc, cur) => {
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if (cur.name && cur.name.toLowerCase() in ['front', 'cover', 'cover (front)'])
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return cur;
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return acc;
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}) : null;
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}
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exports.selectCover = selectCover;
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async function scanAppendingHeaders(randomReader, options = {}) {
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let apeOffset = randomReader.fileSize;
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if (await (0, ID3v1Parser_1.hasID3v1Header)(randomReader)) {
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apeOffset -= 128;
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const lyricsLen = await (0, Lyrics3_1.getLyricsHeaderLength)(randomReader);
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apeOffset -= lyricsLen;
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}
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options.apeHeader = await APEv2Parser_1.APEv2Parser.findApeFooterOffset(randomReader, apeOffset);
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}
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exports.scanAppendingHeaders = scanAppendingHeaders;
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