1 | const utils = require('./utils');
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2 | const FORMATS = require('./formats');
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3 |
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4 |
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5 |
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6 | const audioEncodingRanks = [
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7 | 'mp4a',
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8 | 'mp3',
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9 | 'vorbis',
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10 | 'aac',
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11 | 'opus',
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12 | 'flac',
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13 | ];
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14 | const videoEncodingRanks = [
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15 | 'mp4v',
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16 | 'avc1',
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17 | 'Sorenson H.283',
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18 | 'MPEG-4 Visual',
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19 | 'VP8',
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20 | 'VP9',
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21 | 'H.264',
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22 | ];
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23 |
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24 | const getVideoBitrate = format => format.bitrate || 0;
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25 | const getVideoEncodingRank = format =>
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26 | videoEncodingRanks.findIndex(enc => format.codecs && format.codecs.includes(enc));
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27 | const getAudioBitrate = format => format.audioBitrate || 0;
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28 | const getAudioEncodingRank = format =>
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29 | audioEncodingRanks.findIndex(enc => format.codecs && format.codecs.includes(enc));
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30 |
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31 |
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32 |
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33 |
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34 |
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35 |
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36 |
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37 |
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38 |
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39 |
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40 | const sortFormatsBy = (a, b, sortBy) => {
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41 | let res = 0;
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42 | for (let fn of sortBy) {
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43 | res = fn(b) - fn(a);
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44 | if (res !== 0) {
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45 | break;
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46 | }
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47 | }
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48 | return res;
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49 | };
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50 |
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51 |
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52 | const sortFormatsByVideo = (a, b) => sortFormatsBy(a, b, [
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53 | format => parseInt(format.qualityLabel),
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54 | getVideoBitrate,
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55 | getVideoEncodingRank,
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56 | ]);
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57 |
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58 |
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59 | const sortFormatsByAudio = (a, b) => sortFormatsBy(a, b, [
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60 | getAudioBitrate,
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61 | getAudioEncodingRank,
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62 | ]);
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63 |
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64 |
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65 |
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66 |
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67 |
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68 |
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69 |
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70 |
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71 |
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72 | exports.sortFormats = (a, b) => sortFormatsBy(a, b, [
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73 |
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74 | format => +!!format.isHLS,
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75 | format => +!!format.isDashMPD,
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76 | format => +(format.contentLength > 0),
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77 | format => +(format.hasVideo && format.hasAudio),
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78 | format => +format.hasVideo,
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79 | format => parseInt(format.qualityLabel) || 0,
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80 | getVideoBitrate,
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81 | getAudioBitrate,
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82 | getVideoEncodingRank,
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83 | getAudioEncodingRank,
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84 | ]);
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85 |
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86 |
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87 |
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88 |
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89 |
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90 |
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91 |
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92 |
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93 |
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94 |
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95 | exports.chooseFormat = (formats, options) => {
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96 | if (typeof options.format === 'object') {
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97 | if (!options.format.url) {
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98 | throw Error('Invalid format given, did you use `ytdl.getInfo()`?');
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99 | }
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100 | return options.format;
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101 | }
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102 |
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103 | if (options.filter) {
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104 | formats = exports.filterFormats(formats, options.filter);
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105 | }
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106 |
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107 | let format;
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108 | const quality = options.quality || 'highest';
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109 | switch (quality) {
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110 | case 'highest':
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111 | format = formats[0];
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112 | break;
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113 |
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114 | case 'lowest':
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115 | format = formats[formats.length - 1];
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116 | break;
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117 |
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118 | case 'highestaudio':
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119 | formats = exports.filterFormats(formats, 'audio');
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120 | formats.sort(sortFormatsByAudio);
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121 | format = formats[0];
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122 | break;
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123 |
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124 | case 'lowestaudio':
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125 | formats = exports.filterFormats(formats, 'audio');
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126 | formats.sort(sortFormatsByAudio);
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127 | format = formats[formats.length - 1];
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128 | break;
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129 |
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130 | case 'highestvideo':
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131 | formats = exports.filterFormats(formats, 'video');
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132 | formats.sort(sortFormatsByVideo);
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133 | format = formats[0];
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134 | break;
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135 |
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136 | case 'lowestvideo':
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137 | formats = exports.filterFormats(formats, 'video');
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138 | formats.sort(sortFormatsByVideo);
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139 | format = formats[formats.length - 1];
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140 | break;
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141 |
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142 | default:
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143 | format = getFormatByQuality(quality, formats);
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144 | break;
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145 | }
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146 |
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147 | if (!format) {
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148 | throw Error(`No such format found: ${quality}`);
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149 | }
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150 | return format;
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151 | };
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152 |
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153 |
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154 |
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155 |
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156 |
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157 |
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158 |
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159 |
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160 | const getFormatByQuality = (quality, formats) => {
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161 | let getFormat = itag => formats.find(format => `${format.itag}` === `${itag}`);
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162 | if (Array.isArray(quality)) {
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163 | return getFormat(quality.find(q => getFormat(q)));
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164 | } else {
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165 | return getFormat(quality);
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166 | }
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167 | };
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168 |
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169 |
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170 |
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171 |
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172 |
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173 |
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174 |
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175 | exports.filterFormats = (formats, filter) => {
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176 | let fn;
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177 | switch (filter) {
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178 | case 'videoandaudio':
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179 | case 'audioandvideo':
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180 | fn = format => format.hasVideo && format.hasAudio;
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181 | break;
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182 |
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183 | case 'video':
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184 | fn = format => format.hasVideo;
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185 | break;
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186 |
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187 | case 'videoonly':
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188 | fn = format => format.hasVideo && !format.hasAudio;
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189 | break;
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190 |
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191 | case 'audio':
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192 | fn = format => format.hasAudio;
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193 | break;
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194 |
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195 | case 'audioonly':
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196 | fn = format => !format.hasVideo && format.hasAudio;
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197 | break;
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198 |
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199 | default:
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200 | if (typeof filter === 'function') {
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201 | fn = filter;
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202 | } else {
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203 | throw TypeError(`Given filter (${filter}) is not supported`);
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204 | }
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205 | }
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206 | return formats.filter(format => !!format.url && fn(format));
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207 | };
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208 |
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209 |
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210 |
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211 |
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212 |
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213 |
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214 | exports.addFormatMeta = format => {
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215 | format = Object.assign({}, FORMATS[format.itag], format);
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216 | format.hasVideo = !!format.qualityLabel;
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217 | format.hasAudio = !!format.audioBitrate;
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218 | format.container = format.mimeType ?
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219 | format.mimeType.split(';')[0].split('/')[1] : null;
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220 | format.codecs = format.mimeType ?
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221 | utils.between(format.mimeType, 'codecs="', '"') : null;
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222 | format.videoCodec = format.hasVideo && format.codecs ?
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223 | format.codecs.split(', ')[0] : null;
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224 | format.audioCodec = format.hasAudio && format.codecs ?
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225 | format.codecs.split(', ').slice(-1)[0] : null;
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226 | format.isLive = /\bsource[/=]yt_live_broadcast\b/.test(format.url);
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227 | format.isHLS = /\/manifest\/hls_(variant|playlist)\//.test(format.url);
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228 | format.isDashMPD = /\/manifest\/dash\//.test(format.url);
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229 | return format;
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230 | };
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