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