[Sommaire] [Imprimer]

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