www/plugins-dist/medias/lib/getid3/module.audio.la.php

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