1<?php 2 3///////////////////////////////////////////////////////////////// 4/// getID3() by James Heinrich <info@getid3.org> // 5// available at https://github.com/JamesHeinrich/getID3 // 6// or https://www.getid3.org // 7// or http://getid3.sourceforge.net // 8// see readme.txt for more details // 9///////////////////////////////////////////////////////////////// 10// // 11// module.audio.la.php // 12// module for analyzing LA (LosslessAudio) audio files // 13// dependencies: module.audio.riff.php // 14// /// 15///////////////////////////////////////////////////////////////// 16 17if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers 18 exit; 19} 20getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true); 21 22class getid3_la extends getid3_handler 23{ 24 /** 25 * @return bool 26 */ 27 public function Analyze() { 28 $info = &$this->getid3->info; 29 30 $offset = 0; 31 $this->fseek($info['avdataoffset']); 32 $rawdata = $this->fread($this->getid3->fread_buffer_size()); 33 34 switch (substr($rawdata, $offset, 4)) { 35 case 'LA02': 36 case 'LA03': 37 case 'LA04': 38 $info['fileformat'] = 'la'; 39 $info['audio']['dataformat'] = 'la'; 40 $info['audio']['lossless'] = true; 41 42 $info['la']['version_major'] = (int) substr($rawdata, $offset + 2, 1); 43 $info['la']['version_minor'] = (int) substr($rawdata, $offset + 3, 1); 44 $info['la']['version'] = (float) $info['la']['version_major'] + ($info['la']['version_minor'] / 10); 45 $offset += 4; 46 47 $info['la']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 48 $offset += 4; 49 if ($info['la']['uncompressed_size'] == 0) { 50 $this->error('Corrupt LA file: uncompressed_size == zero'); 51 return false; 52 } 53 54 $WAVEchunk = substr($rawdata, $offset, 4); 55 if ($WAVEchunk !== 'WAVE') { 56 $this->error('Expected "WAVE" ('.getid3_lib::PrintHexBytes('WAVE').') at offset '.$offset.', found "'.$WAVEchunk.'" ('.getid3_lib::PrintHexBytes($WAVEchunk).') instead.'); 57 return false; 58 } 59 $offset += 4; 60 61 $info['la']['fmt_size'] = 24; 62 if ($info['la']['version'] >= 0.3) { 63 64 $info['la']['fmt_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 65 $info['la']['header_size'] = 49 + $info['la']['fmt_size'] - 24; 66 $offset += 4; 67 68 } else { 69 70 // version 0.2 didn't support additional data blocks 71 $info['la']['header_size'] = 41; 72 73 } 74 75 $fmt_chunk = substr($rawdata, $offset, 4); 76 if ($fmt_chunk !== 'fmt ') { 77 $this->error('Expected "fmt " ('.getid3_lib::PrintHexBytes('fmt ').') at offset '.$offset.', found "'.$fmt_chunk.'" ('.getid3_lib::PrintHexBytes($fmt_chunk).') instead.'); 78 return false; 79 } 80 $offset += 4; 81 $fmt_size = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 82 $offset += 4; 83 84 $info['la']['raw']['format'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2)); 85 $offset += 2; 86 87 $info['la']['channels'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2)); 88 $offset += 2; 89 if ($info['la']['channels'] == 0) { 90 $this->error('Corrupt LA file: channels == zero'); 91 return false; 92 } 93 94 $info['la']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 95 $offset += 4; 96 if ($info['la']['sample_rate'] == 0) { 97 $this->error('Corrupt LA file: sample_rate == zero'); 98 return false; 99 } 100 101 $info['la']['bytes_per_second'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 102 $offset += 4; 103 $info['la']['bytes_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2)); 104 $offset += 2; 105 $info['la']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2)); 106 $offset += 2; 107 108 $info['la']['samples'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 109 $offset += 4; 110 111 $info['la']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 1)); 112 $offset += 1; 113 $info['la']['flags']['seekable'] = (bool) ($info['la']['raw']['flags'] & 0x01); 114 if ($info['la']['version'] >= 0.4) { 115 $info['la']['flags']['high_compression'] = (bool) ($info['la']['raw']['flags'] & 0x02); 116 } 117 118 $info['la']['original_crc'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 119 $offset += 4; 120 121 // mikeØbevin*de 122 // Basically, the blocksize/seekevery are 61440/19 in La0.4 and 73728/16 123 // in earlier versions. A seekpoint is added every blocksize * seekevery 124 // samples, so 4 * int(totalSamples / (blockSize * seekEvery)) should 125 // give the number of bytes used for the seekpoints. Of course, if seeking 126 // is disabled, there are no seekpoints stored. 127 if ($info['la']['version'] >= 0.4) { 128 $info['la']['blocksize'] = 61440; 129 $info['la']['seekevery'] = 19; 130 } else { 131 $info['la']['blocksize'] = 73728; 132 $info['la']['seekevery'] = 16; 133 } 134 135 $info['la']['seekpoint_count'] = 0; 136 if ($info['la']['flags']['seekable']) { 137 $info['la']['seekpoint_count'] = floor($info['la']['samples'] / ($info['la']['blocksize'] * $info['la']['seekevery'])); 138 139 for ($i = 0; $i < $info['la']['seekpoint_count']; $i++) { 140 $info['la']['seekpoints'][] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 141 $offset += 4; 142 } 143 } 144 145 if ($info['la']['version'] >= 0.3) { 146 147 // Following the main header information, the program outputs all of the 148 // seekpoints. Following these is what I called the 'footer start', 149 // i.e. the position immediately after the La audio data is finished. 150 $info['la']['footerstart'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 151 $offset += 4; 152 153 if ($info['la']['footerstart'] > $info['filesize']) { 154 $this->warning('FooterStart value points to offset '.$info['la']['footerstart'].' which is beyond end-of-file ('.$info['filesize'].')'); 155 $info['la']['footerstart'] = $info['filesize']; 156 } 157 158 } else { 159 160 // La v0.2 didn't have FooterStart value 161 $info['la']['footerstart'] = $info['avdataend']; 162 163 } 164 165 if ($info['la']['footerstart'] < $info['avdataend']) { 166 if ($RIFFtempfilename = tempnam(GETID3_TEMP_DIR, 'id3')) { 167 if ($RIFF_fp = fopen($RIFFtempfilename, 'w+b')) { 168 $RIFFdata = 'WAVE'; 169 if ($info['la']['version'] == 0.2) { 170 $RIFFdata .= substr($rawdata, 12, 24); 171 } else { 172 $RIFFdata .= substr($rawdata, 16, 24); 173 } 174 if ($info['la']['footerstart'] < $info['avdataend']) { 175 $this->fseek($info['la']['footerstart']); 176 $RIFFdata .= $this->fread($info['avdataend'] - $info['la']['footerstart']); 177 } 178 $RIFFdata = 'RIFF'.getid3_lib::LittleEndian2String(strlen($RIFFdata), 4, false).$RIFFdata; 179 fwrite($RIFF_fp, $RIFFdata, strlen($RIFFdata)); 180 fclose($RIFF_fp); 181 182 $getid3_temp = new getID3(); 183 $getid3_temp->openfile($RIFFtempfilename); 184 $getid3_riff = new getid3_riff($getid3_temp); 185 $getid3_riff->Analyze(); 186 187 if (empty($getid3_temp->info['error'])) { 188 $info['riff'] = $getid3_temp->info['riff']; 189 } else { 190 $this->warning('Error parsing RIFF portion of La file: '.implode($getid3_temp->info['error'])); 191 } 192 unset($getid3_temp, $getid3_riff); 193 } 194 unlink($RIFFtempfilename); 195 } 196 } 197 198 // $info['avdataoffset'] should be zero to begin with, but just in case it's not, include the addition anyway 199 $info['avdataend'] = $info['avdataoffset'] + $info['la']['footerstart']; 200 $info['avdataoffset'] = $info['avdataoffset'] + $offset; 201 202 $info['la']['compression_ratio'] = (float) (($info['avdataend'] - $info['avdataoffset']) / $info['la']['uncompressed_size']); 203 $info['playtime_seconds'] = (float) ($info['la']['samples'] / $info['la']['sample_rate']) / $info['la']['channels']; 204 if ($info['playtime_seconds'] == 0) { 205 $this->error('Corrupt LA file: playtime_seconds == zero'); 206 return false; 207 } 208 209 $info['audio']['bitrate'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['playtime_seconds']; 210 //$info['audio']['codec'] = $info['la']['codec']; 211 $info['audio']['bits_per_sample'] = $info['la']['bits_per_sample']; 212 break; 213 214 default: 215 if (substr($rawdata, $offset, 2) == 'LA') { 216 $this->error('This version of getID3() ['.$this->getid3->version().'] does not support LA version '.substr($rawdata, $offset + 2, 1).'.'.substr($rawdata, $offset + 3, 1).' which this appears to be - check http://getid3.sourceforge.net for updates.'); 217 } else { 218 $this->error('Not a LA (Lossless-Audio) file'); 219 } 220 return false; 221 } 222 223 $info['audio']['channels'] = $info['la']['channels']; 224 $info['audio']['sample_rate'] = (int) $info['la']['sample_rate']; 225 $info['audio']['encoder'] = 'LA v'.$info['la']['version']; 226 227 return true; 228 } 229 230} 231