mirror of
https://github.com/musix-org/musix-oss
synced 2024-12-23 13:03:18 +00:00
415 lines
9.5 KiB
JavaScript
415 lines
9.5 KiB
JavaScript
const qs = require('querystring');
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const url = require('url');
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const FORMATS = require('./formats');
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// Use these to help sort formats, higher is better.
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const audioEncodingRanks = {
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mp3: 1,
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vorbis: 2,
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aac: 3,
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opus: 4,
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flac: 5,
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};
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const videoEncodingRanks = {
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'Sorenson H.283': 1,
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'MPEG-4 Visual': 2,
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'VP8': 3,
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'VP9': 4,
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'H.264': 5,
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};
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/**
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* Sort formats from highest quality to lowest.
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* By resolution, then video bitrate, then audio bitrate.
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*
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* @param {Object} a
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* @param {Object} b
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*/
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exports.sortFormats = (a, b) => {
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const ares = a.resolution ? parseInt(a.resolution.slice(0, -1), 10) : 0;
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const bres = b.resolution ? parseInt(b.resolution.slice(0, -1), 10) : 0;
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const afeats = ~~!!ares * 2 + ~~!!a.audioBitrate;
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const bfeats = ~~!!bres * 2 + ~~!!b.audioBitrate;
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const getBitrate = (c) => {
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if (c.bitrate) {
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let s = c.bitrate.split('-');
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return parseFloat(s[s.length - 1], 10);
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} else {
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return 0;
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}
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};
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const audioScore = (c) => {
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const abitrate = c.audioBitrate || 0;
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const aenc = audioEncodingRanks[c.audioEncoding] || 0;
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return abitrate + aenc / 10;
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};
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if (afeats === bfeats) {
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if (ares === bres) {
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let avbitrate = getBitrate(a);
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let bvbitrate = getBitrate(b);
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if (avbitrate === bvbitrate) {
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let aascore = audioScore(a);
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let bascore = audioScore(b);
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if (aascore === bascore) {
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let avenc = videoEncodingRanks[a.encoding] || 0;
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let bvenc = videoEncodingRanks[b.encoding] || 0;
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return bvenc - avenc;
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} else {
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return bascore - aascore;
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}
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} else {
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return bvbitrate - avbitrate;
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}
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} else {
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return bres - ares;
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}
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} else {
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return bfeats - afeats;
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}
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};
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/**
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* Choose a format depending on the given options.
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*
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* @param {Array.<Object>} formats
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* @param {Object} options
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* @return {Object|Error}
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*/
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exports.chooseFormat = (formats, options) => {
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if (typeof options.format === 'object') {
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return options.format;
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}
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if (options.filter) {
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formats = exports.filterFormats(formats, options.filter);
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if (formats.length === 0) {
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return Error('No formats found with custom filter');
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}
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}
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let format;
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const quality = options.quality || 'highest';
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const getBitrate = (f) => {
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let s = f.bitrate.split('-');
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return parseFloat(s[s.length - 1], 10);
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};
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switch (quality) {
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case 'highest':
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format = formats[0];
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break;
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case 'lowest':
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format = formats[formats.length - 1];
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break;
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case 'highestaudio':
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formats = exports.filterFormats(formats, 'audio');
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format = null;
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for (let f of formats) {
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if (!format
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|| f.audioBitrate > format.audioBitrate
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|| (f.audioBitrate === format.audioBitrate && format.encoding && !f.encoding))
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format = f;
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}
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break;
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case 'lowestaudio':
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formats = exports.filterFormats(formats, 'audio')
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format = null;
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for (let f of formats) {
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if (!format
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|| f.audioBitrate < format.audioBitrate
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|| (f.audioBitrate === format.audioBitrate && format.encoding && !f.encoding))
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format = f;
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}
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break;
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case 'highestvideo':
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formats = exports.filterFormats(formats, 'video');
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format = null;
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for (let f of formats) {
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if (!format
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|| getBitrate(f) > getBitrate(format)
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|| (getBitrate(f) === getBitrate(format) && format.audioEncoding && !f.audioEncoding))
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format = f;
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}
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break;
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case 'lowestvideo':
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formats = exports.filterFormats(formats, 'video')
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format = null;
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for (let f of formats) {
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if (!format
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|| getBitrate(f) < getBitrate(format)
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|| (getBitrate(f) === getBitrate(format) && format.audioEncoding && !f.audioEncoding))
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format = f;
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}
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break;
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default: {
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let getFormat = (itag) => {
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return formats.find((format) => format.itag === '' + itag);
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};
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if (Array.isArray(quality)) {
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quality.find((q) => format = getFormat(q));
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} else {
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format = getFormat(quality);
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}
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}
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}
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if (!format) {
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return Error('No such format found: ' + quality);
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}
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return format;
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};
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/**
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* @param {Array.<Object>} formats
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* @param {Function} filter
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* @return {Array.<Object>}
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*/
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exports.filterFormats = (formats, filter) => {
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let fn;
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switch (filter) {
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case 'audioandvideo':
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fn = (format) => format.bitrate && format.audioBitrate;
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break;
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case 'video':
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fn = (format) => format.bitrate;
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break;
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case 'videoonly':
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fn = (format) => format.bitrate && !format.audioBitrate;
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break;
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case 'audio':
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fn = (format) => format.audioBitrate;
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break;
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case 'audioonly':
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fn = (format) => !format.bitrate && format.audioBitrate;
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break;
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default:
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if (typeof filter === 'function') {
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fn = filter;
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} else {
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throw TypeError(`Given filter (${filter}) is not supported`);
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}
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}
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return formats.filter(fn);
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};
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/**
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* String#indexOf() that supports regex too.
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*
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* @param {string} haystack
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* @param {string|RegExp} needle
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* @return {number}
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*/
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const indexOf = (haystack, needle) => {
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return needle instanceof RegExp ?
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haystack.search(needle) : haystack.indexOf(needle);
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};
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/**
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* Extract string inbetween another.
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*
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* @param {string} haystack
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* @param {string} left
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* @param {string} right
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* @return {string}
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*/
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exports.between = (haystack, left, right) => {
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let pos = indexOf(haystack, left);
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if (pos === -1) { return ''; }
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haystack = haystack.slice(pos + left.length);
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pos = indexOf(haystack, right);
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if (pos === -1) { return ''; }
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haystack = haystack.slice(0, pos);
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return haystack;
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};
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/**
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* Get video ID.
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*
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* There are a few type of video URL formats.
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* - https://www.youtube.com/watch?v=VIDEO_ID
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* - https://m.youtube.com/watch?v=VIDEO_ID
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* - https://youtu.be/VIDEO_ID
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* - https://www.youtube.com/v/VIDEO_ID
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* - https://www.youtube.com/embed/VIDEO_ID
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* - https://music.youtube.com/watch?v=VIDEO_ID
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* - https://gaming.youtube.com/watch?v=VIDEO_ID
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*
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* @param {string} link
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* @return {string|Error}
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*/
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const validQueryDomains = new Set([
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'youtube.com',
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'www.youtube.com',
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'm.youtube.com',
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'music.youtube.com',
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'gaming.youtube.com',
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]);
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const validPathDomains = new Set([
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'youtu.be',
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'youtube.com',
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'www.youtube.com',
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]);
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exports.getURLVideoID = (link) => {
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const parsed = url.parse(link, true);
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let id = parsed.query.v;
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if (validPathDomains.has(parsed.hostname) && !id) {
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const paths = parsed.pathname.split('/');
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id = paths[paths.length - 1];
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} else if (parsed.hostname && !validQueryDomains.has(parsed.hostname)) {
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return Error('Not a YouTube domain');
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}
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if (!id) {
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return Error('No video id found: ' + link);
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}
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id = id.substring(0, 11);
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if (!exports.validateID(id)) {
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return TypeError(`Video id (${id}) does not match expected ` +
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`format (${idRegex.toString()})`);
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}
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return id;
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};
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/**
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* Gets video ID either from a url or by checking if the given string
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* matches the video ID format.
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*
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* @param {string} str
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* @return {string|Error}
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*/
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exports.getVideoID = (str) => {
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if (exports.validateID(str)) {
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return str;
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} else {
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return exports.getURLVideoID(str);
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}
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};
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/**
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* Returns true if given id satifies YouTube's id format.
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*
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* @param {string} id
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* @return {boolean}
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*/
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const idRegex = /^[a-zA-Z0-9-_]{11}$/;
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exports.validateID = (id) => {
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return idRegex.test(id);
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};
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/**
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* Checks wether the input string includes a valid id.
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*
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* @param {string} string
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* @return {boolean}
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*/
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exports.validateURL = (string) => {
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return !(exports.getURLVideoID(string) instanceof Error);
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};
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/**
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* @param {Object} info
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* @return {Array.<Object>}
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*/
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exports.parseFormats = (info) => {
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let formats = [];
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if (info.url_encoded_fmt_stream_map) {
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formats = formats
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.concat(info.url_encoded_fmt_stream_map.split(','));
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}
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if (info.adaptive_fmts) {
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formats = formats.concat(info.adaptive_fmts.split(','));
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}
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formats = formats.map((format) => qs.parse(format));
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delete info.url_encoded_fmt_stream_map;
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delete info.adaptive_fmts;
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return formats;
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};
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/**
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* @param {Object} format
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*/
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exports.addFormatMeta = (format) => {
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const meta = FORMATS[format.itag];
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for (let key in meta) {
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format[key] = meta[key];
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}
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format.live = /\/source\/yt_live_broadcast\//.test(format.url);
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format.isHLS = /\/manifest\/hls_(variant|playlist)\//.test(format.url);
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format.isDashMPD = /\/manifest\/dash\//.test(format.url);
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};
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/**
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* Get only the string from an HTML string.
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*
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* @param {string} html
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* @return {string}
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*/
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exports.stripHTML = (html) => {
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return html
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.replace(/\n/g, ' ')
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.replace(/\s*<\s*br\s*\/?\s*>\s*/gi, '\n')
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.replace(/<\s*\/\s*p\s*>\s*<\s*p[^>]*>/gi, '\n')
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.replace(/<.*?>/gi, '')
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.trim();
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};
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/**
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* @param {Array.<Function>} funcs
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* @param {Function(!Error, Array.<Object>)} callback
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*/
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exports.parallel = (funcs, callback) => {
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let funcsDone = 0;
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let errGiven = false;
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let results = [];
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const len = funcs.length;
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const checkDone = (index, err, result) => {
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if (errGiven) { return; }
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if (err) {
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errGiven = true;
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callback(err);
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return;
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}
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results[index] = result;
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if (++funcsDone === len) {
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callback(null, results);
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}
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};
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if (len > 0) {
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funcs.forEach((f, i) => { f(checkDone.bind(null, i)); });
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} else {
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callback(null, results);
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}
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};
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