www/plugins-dist/medias/lib/getid3/module.audio.tta.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.tta.php                                        //
  12 // module for analyzing TTA Audio files                        //
  13 // dependencies: NONE                                          //
  14 //                                                            ///
  15 /////////////////////////////////////////////////////////////////
  16
  17
  18 class getid3_tta extends getid3_handler
  19 {
  20         /**
  21          * @return bool
  22          */
  23         public function Analyze() {
  24                 $info = &$this->getid3->info;
  25
  26                 $info['fileformat']            = 'tta';
  27                 $info['audio']['dataformat']   = 'tta';
  28                 $info['audio']['lossless']     = true;
  29                 $info['audio']['bitrate_mode'] = 'vbr';
  30
  31                 $this->fseek($info['avdataoffset']);
  32                 $ttaheader = $this->fread(26);
  33
  34                 $info['tta']['magic'] = substr($ttaheader, 0, 3);
  35                 $magic = 'TTA';
  36                 if ($info['tta']['magic'] != $magic) {
  37                         $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['tta']['magic']).'"');
  38                         unset($info['fileformat']);
  39                         unset($info['audio']);
  40                         unset($info['tta']);
  41                         return false;
  42                 }
  43
  44                 switch ($ttaheader{3}) {
  45                         case "\x01": // TTA v1.x
  46                         case "\x02": // TTA v1.x
  47                         case "\x03": // TTA v1.x
  48                                 // "It was the demo-version of the TTA encoder. There is no released format with such header. TTA encoder v1 is not supported about a year."
  49                                 $info['tta']['major_version'] = 1;
  50                                 $info['avdataoffset'] += 16;
  51
  52                                 $info['tta']['compression_level']   = ord($ttaheader{3});
  53                                 $info['tta']['channels']            = getid3_lib::LittleEndian2Int(substr($ttaheader,  4,  2));
  54                                 $info['tta']['bits_per_sample']     = getid3_lib::LittleEndian2Int(substr($ttaheader,  6,  2));
  55                                 $info['tta']['sample_rate']         = getid3_lib::LittleEndian2Int(substr($ttaheader,  8,  4));
  56                                 $info['tta']['samples_per_channel'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 12,  4));
  57
  58                                 $info['audio']['encoder_options']   = '-e'.$info['tta']['compression_level'];
  59                                 $info['playtime_seconds']           = $info['tta']['samples_per_channel'] / $info['tta']['sample_rate'];
  60                                 break;
  61
  62                         case '2': // TTA v2.x
  63                                 // "I have hurried to release the TTA 2.0 encoder. Format documentation is removed from our site. This format still in development. Please wait the TTA2 format, encoder v4."
  64                                 $info['tta']['major_version'] = 2;
  65                                 $info['avdataoffset'] += 20;
  66
  67                                 $info['tta']['compression_level']   = getid3_lib::LittleEndian2Int(substr($ttaheader,  4,  2));
  68                                 $info['tta']['audio_format']        = getid3_lib::LittleEndian2Int(substr($ttaheader,  6,  2));
  69                                 $info['tta']['channels']            = getid3_lib::LittleEndian2Int(substr($ttaheader,  8,  2));
  70                                 $info['tta']['bits_per_sample']     = getid3_lib::LittleEndian2Int(substr($ttaheader, 10,  2));
  71                                 $info['tta']['sample_rate']         = getid3_lib::LittleEndian2Int(substr($ttaheader, 12,  4));
  72                                 $info['tta']['data_length']         = getid3_lib::LittleEndian2Int(substr($ttaheader, 16,  4));
  73
  74                                 $info['audio']['encoder_options']   = '-e'.$info['tta']['compression_level'];
  75                                 $info['playtime_seconds']           = $info['tta']['data_length'] / $info['tta']['sample_rate'];
  76                                 break;
  77
  78                         case '1': // TTA v3.x
  79                                 // "This is a first stable release of the TTA format. It will be supported by the encoders v3 or higher."
  80                                 $info['tta']['major_version'] = 3;
  81                                 $info['avdataoffset'] += 26;
  82
  83                                 $info['tta']['audio_format']        = getid3_lib::LittleEndian2Int(substr($ttaheader,  4,  2)); // getid3_riff::wFormatTagLookup()
  84                                 $info['tta']['channels']            = getid3_lib::LittleEndian2Int(substr($ttaheader,  6,  2));
  85                                 $info['tta']['bits_per_sample']     = getid3_lib::LittleEndian2Int(substr($ttaheader,  8,  2));
  86                                 $info['tta']['sample_rate']         = getid3_lib::LittleEndian2Int(substr($ttaheader, 10,  4));
  87                                 $info['tta']['data_length']         = getid3_lib::LittleEndian2Int(substr($ttaheader, 14,  4));
  88                                 $info['tta']['crc32_footer']        =                              substr($ttaheader, 18,  4);
  89                                 $info['tta']['seek_point']          = getid3_lib::LittleEndian2Int(substr($ttaheader, 22,  4));
  90
  91                                 $info['playtime_seconds']           = $info['tta']['data_length'] / $info['tta']['sample_rate'];
  92                                 break;
  93
  94                         default:
  95                                 $this->error('This version of getID3() ['.$this->getid3->version().'] only knows how to handle TTA v1 and v2 - it may not work correctly with this file which appears to be TTA v'.$ttaheader{3});
  96                                 return false;
  97                                 break;
  98                 }
  99
 100                 $info['audio']['encoder']         = 'TTA v'.$info['tta']['major_version'];
 101                 $info['audio']['bits_per_sample'] = $info['tta']['bits_per_sample'];
 102                 $info['audio']['sample_rate']     = $info['tta']['sample_rate'];
 103                 $info['audio']['channels']        = $info['tta']['channels'];
 104                 $info['audio']['bitrate']         = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
 105
 106                 return true;
 107         }
 108
 109 }