File indexing completed on 2024-05-12 05:58:13
0001 <?php 0002 ///////////////////////////////////////////////////////////////// 0003 /// getID3() by James Heinrich <info@getid3.org> // 0004 // available at http://getid3.sourceforge.net // 0005 // or http://www.getid3.org // 0006 // also https://github.com/JamesHeinrich/getID3 // 0007 ///////////////////////////////////////////////////////////////// 0008 // See readme.txt for more details // 0009 ///////////////////////////////////////////////////////////////// 0010 // // 0011 // module.audio.la.php // 0012 // module for analyzing LA (LosslessAudio) audio files // 0013 // dependencies: module.audio.riff.php // 0014 // /// 0015 ///////////////////////////////////////////////////////////////// 0016 0017 getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true); 0018 0019 class getid3_la extends getid3_handler 0020 { 0021 0022 public function Analyze() { 0023 $info = &$this->getid3->info; 0024 0025 $offset = 0; 0026 $this->fseek($info['avdataoffset']); 0027 $rawdata = $this->fread($this->getid3->fread_buffer_size()); 0028 0029 switch (substr($rawdata, $offset, 4)) { 0030 case 'LA02': 0031 case 'LA03': 0032 case 'LA04': 0033 $info['fileformat'] = 'la'; 0034 $info['audio']['dataformat'] = 'la'; 0035 $info['audio']['lossless'] = true; 0036 0037 $info['la']['version_major'] = (int) substr($rawdata, $offset + 2, 1); 0038 $info['la']['version_minor'] = (int) substr($rawdata, $offset + 3, 1); 0039 $info['la']['version'] = (float) $info['la']['version_major'] + ($info['la']['version_minor'] / 10); 0040 $offset += 4; 0041 0042 $info['la']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 0043 $offset += 4; 0044 if ($info['la']['uncompressed_size'] == 0) { 0045 $info['error'][] = 'Corrupt LA file: uncompressed_size == zero'; 0046 return false; 0047 } 0048 0049 $WAVEchunk = substr($rawdata, $offset, 4); 0050 if ($WAVEchunk !== 'WAVE') { 0051 $info['error'][] = 'Expected "WAVE" ('.getid3_lib::PrintHexBytes('WAVE').') at offset '.$offset.', found "'.$WAVEchunk.'" ('.getid3_lib::PrintHexBytes($WAVEchunk).') instead.'; 0052 return false; 0053 } 0054 $offset += 4; 0055 0056 $info['la']['fmt_size'] = 24; 0057 if ($info['la']['version'] >= 0.3) { 0058 0059 $info['la']['fmt_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 0060 $info['la']['header_size'] = 49 + $info['la']['fmt_size'] - 24; 0061 $offset += 4; 0062 0063 } else { 0064 0065 // version 0.2 didn't support additional data blocks 0066 $info['la']['header_size'] = 41; 0067 0068 } 0069 0070 $fmt_chunk = substr($rawdata, $offset, 4); 0071 if ($fmt_chunk !== 'fmt ') { 0072 $info['error'][] = 'Expected "fmt " ('.getid3_lib::PrintHexBytes('fmt ').') at offset '.$offset.', found "'.$fmt_chunk.'" ('.getid3_lib::PrintHexBytes($fmt_chunk).') instead.'; 0073 return false; 0074 } 0075 $offset += 4; 0076 $fmt_size = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 0077 $offset += 4; 0078 0079 $info['la']['raw']['format'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2)); 0080 $offset += 2; 0081 0082 $info['la']['channels'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2)); 0083 $offset += 2; 0084 if ($info['la']['channels'] == 0) { 0085 $info['error'][] = 'Corrupt LA file: channels == zero'; 0086 return false; 0087 } 0088 0089 $info['la']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 0090 $offset += 4; 0091 if ($info['la']['sample_rate'] == 0) { 0092 $info['error'][] = 'Corrupt LA file: sample_rate == zero'; 0093 return false; 0094 } 0095 0096 $info['la']['bytes_per_second'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 0097 $offset += 4; 0098 $info['la']['bytes_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2)); 0099 $offset += 2; 0100 $info['la']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2)); 0101 $offset += 2; 0102 0103 $info['la']['samples'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 0104 $offset += 4; 0105 0106 $info['la']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 1)); 0107 $offset += 1; 0108 $info['la']['flags']['seekable'] = (bool) ($info['la']['raw']['flags'] & 0x01); 0109 if ($info['la']['version'] >= 0.4) { 0110 $info['la']['flags']['high_compression'] = (bool) ($info['la']['raw']['flags'] & 0x02); 0111 } 0112 0113 $info['la']['original_crc'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 0114 $offset += 4; 0115 0116 // mikeØbevin*de 0117 // Basically, the blocksize/seekevery are 61440/19 in La0.4 and 73728/16 0118 // in earlier versions. A seekpoint is added every blocksize * seekevery 0119 // samples, so 4 * int(totalSamples / (blockSize * seekEvery)) should 0120 // give the number of bytes used for the seekpoints. Of course, if seeking 0121 // is disabled, there are no seekpoints stored. 0122 if ($info['la']['version'] >= 0.4) { 0123 $info['la']['blocksize'] = 61440; 0124 $info['la']['seekevery'] = 19; 0125 } else { 0126 $info['la']['blocksize'] = 73728; 0127 $info['la']['seekevery'] = 16; 0128 } 0129 0130 $info['la']['seekpoint_count'] = 0; 0131 if ($info['la']['flags']['seekable']) { 0132 $info['la']['seekpoint_count'] = floor($info['la']['samples'] / ($info['la']['blocksize'] * $info['la']['seekevery'])); 0133 0134 for ($i = 0; $i < $info['la']['seekpoint_count']; $i++) { 0135 $info['la']['seekpoints'][] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 0136 $offset += 4; 0137 } 0138 } 0139 0140 if ($info['la']['version'] >= 0.3) { 0141 0142 // Following the main header information, the program outputs all of the 0143 // seekpoints. Following these is what I called the 'footer start', 0144 // i.e. the position immediately after the La audio data is finished. 0145 $info['la']['footerstart'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); 0146 $offset += 4; 0147 0148 if ($info['la']['footerstart'] > $info['filesize']) { 0149 $info['warning'][] = 'FooterStart value points to offset '.$info['la']['footerstart'].' which is beyond end-of-file ('.$info['filesize'].')'; 0150 $info['la']['footerstart'] = $info['filesize']; 0151 } 0152 0153 } else { 0154 0155 // La v0.2 didn't have FooterStart value 0156 $info['la']['footerstart'] = $info['avdataend']; 0157 0158 } 0159 0160 if ($info['la']['footerstart'] < $info['avdataend']) { 0161 if ($RIFFtempfilename = tempnam(GETID3_TEMP_DIR, 'id3')) { 0162 if ($RIFF_fp = fopen($RIFFtempfilename, 'w+b')) { 0163 $RIFFdata = 'WAVE'; 0164 if ($info['la']['version'] == 0.2) { 0165 $RIFFdata .= substr($rawdata, 12, 24); 0166 } else { 0167 $RIFFdata .= substr($rawdata, 16, 24); 0168 } 0169 if ($info['la']['footerstart'] < $info['avdataend']) { 0170 $this->fseek($info['la']['footerstart']); 0171 $RIFFdata .= $this->fread($info['avdataend'] - $info['la']['footerstart']); 0172 } 0173 $RIFFdata = 'RIFF'.getid3_lib::LittleEndian2String(strlen($RIFFdata), 4, false).$RIFFdata; 0174 fwrite($RIFF_fp, $RIFFdata, strlen($RIFFdata)); 0175 fclose($RIFF_fp); 0176 0177 $getid3_temp = new getID3(); 0178 $getid3_temp->openfile($RIFFtempfilename); 0179 $getid3_riff = new getid3_riff($getid3_temp); 0180 $getid3_riff->Analyze(); 0181 0182 if (empty($getid3_temp->info['error'])) { 0183 $info['riff'] = $getid3_temp->info['riff']; 0184 } else { 0185 $info['warning'][] = 'Error parsing RIFF portion of La file: '.implode($getid3_temp->info['error']); 0186 } 0187 unset($getid3_temp, $getid3_riff); 0188 } 0189 unlink($RIFFtempfilename); 0190 } 0191 } 0192 0193 // $info['avdataoffset'] should be zero to begin with, but just in case it's not, include the addition anyway 0194 $info['avdataend'] = $info['avdataoffset'] + $info['la']['footerstart']; 0195 $info['avdataoffset'] = $info['avdataoffset'] + $offset; 0196 0197 $info['la']['compression_ratio'] = (float) (($info['avdataend'] - $info['avdataoffset']) / $info['la']['uncompressed_size']); 0198 $info['playtime_seconds'] = (float) ($info['la']['samples'] / $info['la']['sample_rate']) / $info['la']['channels']; 0199 if ($info['playtime_seconds'] == 0) { 0200 $info['error'][] = 'Corrupt LA file: playtime_seconds == zero'; 0201 return false; 0202 } 0203 0204 $info['audio']['bitrate'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['playtime_seconds']; 0205 //$info['audio']['codec'] = $info['la']['codec']; 0206 $info['audio']['bits_per_sample'] = $info['la']['bits_per_sample']; 0207 break; 0208 0209 default: 0210 if (substr($rawdata, $offset, 2) == 'LA') { 0211 $info['error'][] = 'This version of getID3() ['.$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.'; 0212 } else { 0213 $info['error'][] = 'Not a LA (Lossless-Audio) file'; 0214 } 0215 return false; 0216 break; 0217 } 0218 0219 $info['audio']['channels'] = $info['la']['channels']; 0220 $info['audio']['sample_rate'] = (int) $info['la']['sample_rate']; 0221 $info['audio']['encoder'] = 'LA v'.$info['la']['version']; 0222 0223 return true; 0224 } 0225 0226 }