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
  18 class getid3_au extends getid3_handler
  19 {
  20         /**
  21          * @return bool
  22          */
  23         public function Analyze() {
  24                 $info = &$this->getid3->info;
  25
  26                 $this->fseek($info['avdataoffset']);
  27                 $AUheader  = $this->fread(8);
  28
  29                 $magic = '.snd';
  30                 if (substr($AUheader, 0, 4) != $magic) {
  31                         $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" (".snd") at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($AUheader, 0, 4)).'"');
  32                         return false;
  33                 }
  34
  35                 // shortcut
  36                 $info['au'] = array();
  37                 $thisfile_au        = &$info['au'];
  38
  39                 $info['fileformat']            = 'au';
  40                 $info['audio']['dataformat']   = 'au';
  41                 $info['audio']['bitrate_mode'] = 'cbr';
  42                 $thisfile_au['encoding']               = 'ISO-8859-1';
  43
  44                 $thisfile_au['header_length']   = getid3_lib::BigEndian2Int(substr($AUheader,  4, 4));
  45                 $AUheader .= $this->fread($thisfile_au['header_length'] - 8);
  46                 $info['avdataoffset'] += $thisfile_au['header_length'];
  47
  48                 $thisfile_au['data_size']             = getid3_lib::BigEndian2Int(substr($AUheader,  8, 4));
  49                 $thisfile_au['data_format_id']        = getid3_lib::BigEndian2Int(substr($AUheader, 12, 4));
  50                 $thisfile_au['sample_rate']           = getid3_lib::BigEndian2Int(substr($AUheader, 16, 4));
  51                 $thisfile_au['channels']              = getid3_lib::BigEndian2Int(substr($AUheader, 20, 4));
  52                 $thisfile_au['comments']['comment'][] =                      trim(substr($AUheader, 24));
  53
  54                 $thisfile_au['data_format'] = $this->AUdataFormatNameLookup($thisfile_au['data_format_id']);
  55                 $thisfile_au['used_bits_per_sample'] = $this->AUdataFormatUsedBitsPerSampleLookup($thisfile_au['data_format_id']);
  56                 if ($thisfile_au['bits_per_sample'] = $this->AUdataFormatBitsPerSampleLookup($thisfile_au['data_format_id'])) {
  57                         $info['audio']['bits_per_sample'] = $thisfile_au['bits_per_sample'];
  58                 } else {
  59                         unset($thisfile_au['bits_per_sample']);
  60                 }
  61
  62                 $info['audio']['sample_rate']  = $thisfile_au['sample_rate'];
  63                 $info['audio']['channels']     = $thisfile_au['channels'];
  64
  65                 if (($info['avdataoffset'] + $thisfile_au['data_size']) > $info['avdataend']) {
  66                         $this->warning('Possible truncated file - expecting "'.$thisfile_au['data_size'].'" bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' bytes"');
  67                 }
  68
  69                 $info['playtime_seconds'] = $thisfile_au['data_size'] / ($thisfile_au['sample_rate'] * $thisfile_au['channels'] * ($thisfile_au['used_bits_per_sample'] / 8));
  70                 $info['audio']['bitrate'] = ($thisfile_au['data_size'] * 8) / $info['playtime_seconds'];
  71
  72                 return true;
  73         }
  74
  75         /**
  76          * @param int $id
  77          *
  78          * @return string|false
  79          */
  80         public function AUdataFormatNameLookup($id) {
  81                 static $AUdataFormatNameLookup = array(
  82                         0  => 'unspecified format',
  83                         1  => '8-bit mu-law',
  84                         2  => '8-bit linear',
  85                         3  => '16-bit linear',
  86                         4  => '24-bit linear',
  87                         5  => '32-bit linear',
  88                         6  => 'floating-point',
  89                         7  => 'double-precision float',
  90                         8  => 'fragmented sampled data',
  91                         9  => 'SUN_FORMAT_NESTED',
  92                         10 => 'DSP program',
  93                         11 => '8-bit fixed-point',
  94                         12 => '16-bit fixed-point',
  95                         13 => '24-bit fixed-point',
  96                         14 => '32-bit fixed-point',
  97
  98                         16 => 'non-audio display data',
  99                         17 => 'SND_FORMAT_MULAW_SQUELCH',
 100                         18 => '16-bit linear with emphasis',
 101                         19 => '16-bit linear with compression',
 102                         20 => '16-bit linear with emphasis + compression',
 103                         21 => 'Music Kit DSP commands',
 104                         22 => 'SND_FORMAT_DSP_COMMANDS_SAMPLES',
 105                         23 => 'CCITT g.721 4-bit ADPCM',
 106                         24 => 'CCITT g.722 ADPCM',
 107                         25 => 'CCITT g.723 3-bit ADPCM',
 108                         26 => 'CCITT g.723 5-bit ADPCM',
 109                         27 => 'A-Law 8-bit'
 110                 );
 111                 return (isset($AUdataFormatNameLookup[$id]) ? $AUdataFormatNameLookup[$id] : false);
 112         }
 113
 114         /**
 115          * @param int $id
 116          *
 117          * @return int|false
 118          */
 119         public function AUdataFormatBitsPerSampleLookup($id) {
 120                 static $AUdataFormatBitsPerSampleLookup = array(
 121                         1  => 8,
 122                         2  => 8,
 123                         3  => 16,
 124                         4  => 24,
 125                         5  => 32,
 126                         6  => 32,
 127                         7  => 64,
 128
 129                         11 => 8,
 130                         12 => 16,
 131                         13 => 24,
 132                         14 => 32,
 133
 134                         18 => 16,
 135                         19 => 16,
 136                         20 => 16,
 137
 138                         23 => 16,
 139
 140                         25 => 16,
 141                         26 => 16,
 142                         27 => 8
 143                 );
 144                 return (isset($AUdataFormatBitsPerSampleLookup[$id]) ? $AUdataFormatBitsPerSampleLookup[$id] : false);
 145         }
 146
 147         /**
 148          * @param int $id
 149          *
 150          * @return int|false
 151          */
 152         public function AUdataFormatUsedBitsPerSampleLookup($id) {
 153                 static $AUdataFormatUsedBitsPerSampleLookup = array(
 154                         1  => 8,
 155                         2  => 8,
 156                         3  => 16,
 157                         4  => 24,
 158                         5  => 32,
 159                         6  => 32,
 160                         7  => 64,
 161
 162                         11 => 8,
 163                         12 => 16,
 164                         13 => 24,
 165                         14 => 32,
 166
 167                         18 => 16,
 168                         19 => 16,
 169                         20 => 16,
 170
 171                         23 => 4,
 172
 173                         25 => 3,
 174                         26 => 5,
 175                         27 => 8,
 176                 );
 177                 return (isset($AUdataFormatUsedBitsPerSampleLookup[$id]) ? $AUdataFormatUsedBitsPerSampleLookup[$id] : false);
 178         }
 179
 180 }