www/plugins-dist/medias/lib/getid3/module.audio.au.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.au.php                                         //
  12 // module for analyzing AU files                               //
  13 // dependencies: NONE                                          //
  14 //                                                            ///
  15 /////////////////////////////////////////////////////////////////
  16
  17 if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
  18         exit;
  19 }
  20
  21 class getid3_au extends getid3_handler
  22 {
  23         /**
  24          * @return bool
  25          */
  26         public function Analyze() {
  27                 $info = &$this->getid3->info;
  28
  29                 $this->fseek($info['avdataoffset']);
  30                 $AUheader  = $this->fread(8);
  31
  32                 $magic = '.snd';
  33                 if (substr($AUheader, 0, 4) != $magic) {
  34                         $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" (".snd") at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($AUheader, 0, 4)).'"');
  35                         return false;
  36                 }
  37
  38                 // shortcut
  39                 $info['au'] = array();
  40                 $thisfile_au        = &$info['au'];
  41
  42                 $info['fileformat']            = 'au';
  43                 $info['audio']['dataformat']   = 'au';
  44                 $info['audio']['bitrate_mode'] = 'cbr';
  45                 $thisfile_au['encoding']               = 'ISO-8859-1';
  46
  47                 $thisfile_au['header_length']   = getid3_lib::BigEndian2Int(substr($AUheader,  4, 4));
  48                 $AUheader .= $this->fread($thisfile_au['header_length'] - 8);
  49                 $info['avdataoffset'] += $thisfile_au['header_length'];
  50
  51                 $thisfile_au['data_size']             = getid3_lib::BigEndian2Int(substr($AUheader,  8, 4));
  52                 $thisfile_au['data_format_id']        = getid3_lib::BigEndian2Int(substr($AUheader, 12, 4));
  53                 $thisfile_au['sample_rate']           = getid3_lib::BigEndian2Int(substr($AUheader, 16, 4));
  54                 $thisfile_au['channels']              = getid3_lib::BigEndian2Int(substr($AUheader, 20, 4));
  55                 $thisfile_au['comments']['comment'][] =                      trim(substr($AUheader, 24));
  56
  57                 $thisfile_au['data_format'] = $this->AUdataFormatNameLookup($thisfile_au['data_format_id']);
  58                 $thisfile_au['used_bits_per_sample'] = $this->AUdataFormatUsedBitsPerSampleLookup($thisfile_au['data_format_id']);
  59                 if ($thisfile_au['bits_per_sample'] = $this->AUdataFormatBitsPerSampleLookup($thisfile_au['data_format_id'])) {
  60                         $info['audio']['bits_per_sample'] = $thisfile_au['bits_per_sample'];
  61                 } else {
  62                         unset($thisfile_au['bits_per_sample']);
  63                 }
  64
  65                 $info['audio']['sample_rate']  = $thisfile_au['sample_rate'];
  66                 $info['audio']['channels']     = $thisfile_au['channels'];
  67
  68                 if (($info['avdataoffset'] + $thisfile_au['data_size']) > $info['avdataend']) {
  69                         $this->warning('Possible truncated file - expecting "'.$thisfile_au['data_size'].'" bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' bytes"');
  70                 }
  71
  72                 $info['playtime_seconds'] = $thisfile_au['data_size'] / ($thisfile_au['sample_rate'] * $thisfile_au['channels'] * ($thisfile_au['used_bits_per_sample'] / 8));
  73                 $info['audio']['bitrate'] = ($thisfile_au['data_size'] * 8) / $info['playtime_seconds'];
  74
  75                 return true;
  76         }
  77
  78         /**
  79          * @param int $id
  80          *
  81          * @return string|false
  82          */
  83         public function AUdataFormatNameLookup($id) {
  84                 static $AUdataFormatNameLookup = array(
  85                         0  => 'unspecified format',
  86                         1  => '8-bit mu-law',
  87                         2  => '8-bit linear',
  88                         3  => '16-bit linear',
  89                         4  => '24-bit linear',
  90                         5  => '32-bit linear',
  91                         6  => 'floating-point',
  92                         7  => 'double-precision float',
  93                         8  => 'fragmented sampled data',
  94                         9  => 'SUN_FORMAT_NESTED',
  95                         10 => 'DSP program',
  96                         11 => '8-bit fixed-point',
  97                         12 => '16-bit fixed-point',
  98                         13 => '24-bit fixed-point',
  99                         14 => '32-bit fixed-point',
 100
 101                         16 => 'non-audio display data',
 102                         17 => 'SND_FORMAT_MULAW_SQUELCH',
 103                         18 => '16-bit linear with emphasis',
 104                         19 => '16-bit linear with compression',
 105                         20 => '16-bit linear with emphasis + compression',
 106                         21 => 'Music Kit DSP commands',
 107                         22 => 'SND_FORMAT_DSP_COMMANDS_SAMPLES',
 108                         23 => 'CCITT g.721 4-bit ADPCM',
 109                         24 => 'CCITT g.722 ADPCM',
 110                         25 => 'CCITT g.723 3-bit ADPCM',
 111                         26 => 'CCITT g.723 5-bit ADPCM',
 112                         27 => 'A-Law 8-bit'
 113                 );
 114                 return (isset($AUdataFormatNameLookup[$id]) ? $AUdataFormatNameLookup[$id] : false);
 115         }
 116
 117         /**
 118          * @param int $id
 119          *
 120          * @return int|false
 121          */
 122         public function AUdataFormatBitsPerSampleLookup($id) {
 123                 static $AUdataFormatBitsPerSampleLookup = array(
 124                         1  => 8,
 125                         2  => 8,
 126                         3  => 16,
 127                         4  => 24,
 128                         5  => 32,
 129                         6  => 32,
 130                         7  => 64,
 131
 132                         11 => 8,
 133                         12 => 16,
 134                         13 => 24,
 135                         14 => 32,
 136
 137                         18 => 16,
 138                         19 => 16,
 139                         20 => 16,
 140
 141                         23 => 16,
 142
 143                         25 => 16,
 144                         26 => 16,
 145                         27 => 8
 146                 );
 147                 return (isset($AUdataFormatBitsPerSampleLookup[$id]) ? $AUdataFormatBitsPerSampleLookup[$id] : false);
 148         }
 149
 150         /**
 151          * @param int $id
 152          *
 153          * @return int|false
 154          */
 155         public function AUdataFormatUsedBitsPerSampleLookup($id) {
 156                 static $AUdataFormatUsedBitsPerSampleLookup = array(
 157                         1  => 8,
 158                         2  => 8,
 159                         3  => 16,
 160                         4  => 24,
 161                         5  => 32,
 162                         6  => 32,
 163                         7  => 64,
 164
 165                         11 => 8,
 166                         12 => 16,
 167                         13 => 24,
 168                         14 => 32,
 169
 170                         18 => 16,
 171                         19 => 16,
 172                         20 => 16,
 173
 174                         23 => 4,
 175
 176                         25 => 3,
 177                         26 => 5,
 178                         27 => 8,
 179                 );
 180                 return (isset($AUdataFormatUsedBitsPerSampleLookup[$id]) ? $AUdataFormatUsedBitsPerSampleLookup[$id] : false);
 181         }
 182
 183 }