File indexing completed on 2024-12-22 05:33:12

 <?php
 /////////////////////////////////////////////////////////////////
 /// getID3() by James Heinrich <info@getid3.org>               //
 //  available at http://getid3.sourceforge.net                 //
 //            or http://www.getid3.org                         //
 //          also https://github.com/JamesHeinrich/getID3       //
 /////////////////////////////////////////////////////////////////
 // See readme.txt for more details                             //
 /////////////////////////////////////////////////////////////////
 //                                                             //
 // module.audio.au.php                                         //
 // module for analyzing AU files                               //
 // dependencies: NONE                                          //
 //                                                            ///
 /////////////////////////////////////////////////////////////////
 
 
 class getid3_au extends getid3_handler
 {
 
   public function Analyze() {
     $info = &$this->getid3->info;
 
     $this->fseek($info['avdataoffset']);
     $AUheader  = $this->fread(8);
 
     $magic = '.snd';
     if (substr($AUheader, 0, 4) != $magic) {
       $info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" (".snd") at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($AUheader, 0, 4)).'"';
       return false;
     }
 
     // shortcut
     $info['au'] = array();
     $thisfile_au        = &$info['au'];
 
     $info['fileformat']            = 'au';
     $info['audio']['dataformat']   = 'au';
     $info['audio']['bitrate_mode'] = 'cbr';
     $thisfile_au['encoding']               = 'ISO-8859-1';
 
     $thisfile_au['header_length']   = getid3_lib::BigEndian2Int(substr($AUheader,  4, 4));
     $AUheader .= $this->fread($thisfile_au['header_length'] - 8);
     $info['avdataoffset'] += $thisfile_au['header_length'];
 
     $thisfile_au['data_size']             = getid3_lib::BigEndian2Int(substr($AUheader,  8, 4));
     $thisfile_au['data_format_id']        = getid3_lib::BigEndian2Int(substr($AUheader, 12, 4));
     $thisfile_au['sample_rate']           = getid3_lib::BigEndian2Int(substr($AUheader, 16, 4));
     $thisfile_au['channels']              = getid3_lib::BigEndian2Int(substr($AUheader, 20, 4));
     $thisfile_au['comments']['comment'][] =                      trim(substr($AUheader, 24));
 
     $thisfile_au['data_format'] = $this->AUdataFormatNameLookup($thisfile_au['data_format_id']);
     $thisfile_au['used_bits_per_sample'] = $this->AUdataFormatUsedBitsPerSampleLookup($thisfile_au['data_format_id']);
     if ($thisfile_au['bits_per_sample'] = $this->AUdataFormatBitsPerSampleLookup($thisfile_au['data_format_id'])) {
       $info['audio']['bits_per_sample'] = $thisfile_au['bits_per_sample'];
     } else {
       unset($thisfile_au['bits_per_sample']);
     }
 
     $info['audio']['sample_rate']  = $thisfile_au['sample_rate'];
     $info['audio']['channels']     = $thisfile_au['channels'];
 
     if (($info['avdataoffset'] + $thisfile_au['data_size']) > $info['avdataend']) {
       $info['warning'][] = 'Possible truncated file - expecting "'.$thisfile_au['data_size'].'" bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' bytes"';
     }
 
     $info['playtime_seconds'] = $thisfile_au['data_size'] / ($thisfile_au['sample_rate'] * $thisfile_au['channels'] * ($thisfile_au['used_bits_per_sample'] / 8));
     $info['audio']['bitrate'] = ($thisfile_au['data_size'] * 8) / $info['playtime_seconds'];
 
     return true;
   }
 
   public function AUdataFormatNameLookup($id) {
     static $AUdataFormatNameLookup = array(
       0  => 'unspecified format',
       1  => '8-bit mu-law',
       2  => '8-bit linear',
       3  => '16-bit linear',
       4  => '24-bit linear',
       5  => '32-bit linear',
       6  => 'floating-point',
       7  => 'double-precision float',
       8  => 'fragmented sampled data',
       9  => 'SUN_FORMAT_NESTED',
       10 => 'DSP program',
       11 => '8-bit fixed-point',
       12 => '16-bit fixed-point',
       13 => '24-bit fixed-point',
       14 => '32-bit fixed-point',
 
       16 => 'non-audio display data',
       17 => 'SND_FORMAT_MULAW_SQUELCH',
       18 => '16-bit linear with emphasis',
       19 => '16-bit linear with compression',
       20 => '16-bit linear with emphasis + compression',
       21 => 'Music Kit DSP commands',
       22 => 'SND_FORMAT_DSP_COMMANDS_SAMPLES',
       23 => 'CCITT g.721 4-bit ADPCM',
       24 => 'CCITT g.722 ADPCM',
       25 => 'CCITT g.723 3-bit ADPCM',
       26 => 'CCITT g.723 5-bit ADPCM',
       27 => 'A-Law 8-bit'
     );
     return (isset($AUdataFormatNameLookup[$id]) ? $AUdataFormatNameLookup[$id] : false);
   }
 
   public function AUdataFormatBitsPerSampleLookup($id) {
     static $AUdataFormatBitsPerSampleLookup = array(
       1  => 8,
       2  => 8,
       3  => 16,
       4  => 24,
       5  => 32,
       6  => 32,
       7  => 64,
 
       11 => 8,
       12 => 16,
       13 => 24,
       14 => 32,
 
       18 => 16,
       19 => 16,
       20 => 16,
 
       23 => 16,
 
       25 => 16,
       26 => 16,
       27 => 8
     );
     return (isset($AUdataFormatBitsPerSampleLookup[$id]) ? $AUdataFormatBitsPerSampleLookup[$id] : false);
   }
 
   public function AUdataFormatUsedBitsPerSampleLookup($id) {
     static $AUdataFormatUsedBitsPerSampleLookup = array(
       1  => 8,
       2  => 8,
       3  => 16,
       4  => 24,
       5  => 32,
       6  => 32,
       7  => 64,
 
       11 => 8,
       12 => 16,
       13 => 24,
       14 => 32,
 
       18 => 16,
       19 => 16,
       20 => 16,
 
       23 => 4,
 
       25 => 3,
       26 => 5,
       27 => 8,
     );
     return (isset($AUdataFormatUsedBitsPerSampleLookup[$id]) ? $AUdataFormatUsedBitsPerSampleLookup[$id] : false);
   }
 
 }