vendor/james-heinrich/getid3/getid3/module.audio.la.php

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