Mercurial > judyates

     1 <?php

     2 // +----------------------------------------------------------------------+

     3 // | PHP version 5                                                        |

     4 // +----------------------------------------------------------------------+

     5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen                 |

     6 // +----------------------------------------------------------------------+

     7 // | This source file is subject to version 2 of the GPL license,         |

     8 // | that is bundled with this package in the file license.txt and is     |

     9 // | available through the world-wide-web at the following url:           |

    10 // | http://www.gnu.org/copyleft/gpl.html                                 |

    11 // +----------------------------------------------------------------------+

    12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org    |

    13 // +----------------------------------------------------------------------+

    14 // | Authors: James Heinrich <infoØgetid3*org>                            |

    15 // |          Allan Hansen <ahØartemis*dk>                                |

    16 // +----------------------------------------------------------------------+

    17 // | module.audio.shorten.php                                             |

    18 // | Module for analyzing Shorten Audio files                             |

    19 // | dependencies: module.audio-video.riff.php                            |

    20 // +----------------------------------------------------------------------+

    21 //

    22 // $Id: module.audio.shorten.php,v 1.5 2006/12/03 19:28:18 ah Exp $

    23 

    24         

    25         

    26 class getid3_shorten extends getid3_handler

    27 {

    28 

    29     public function __construct(getID3 $getid3) {

    30 

    31         parent::__construct($getid3);

    32         

    33         if ((bool)ini_get('safe_mode')) {

    34             throw new getid3_exception('PHP running in Safe Mode - backtick operator not available, cannot analyze Shorten files.');

    35         }

    36 

    37         if (!`head --version`) {

    38             throw new getid3_exception('head[.exe] binary not found in path. UNIX: typically /usr/bin. Windows: typically c:\windows\system32.');

    39         }

    40         

    41         if (!`shorten -l`) {

    42             throw new getid3_exception('shorten[.exe] binary not found in path. UNIX: typically /usr/bin. Windows: typically c:\windows\system32.');

    43         }

    44     }

    45 

    46 

    47     public function Analyze() {

    48         

    49         $getid3 = $this->getid3;

    50 

    51         $getid3->include_module('audio-video.riff');

    52 

    53         fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);

    54 

    55         $shn_header = fread($getid3->fp, 8);

    56         

    57         // Magic bytes: "ajkg"

    58         

    59         $getid3->info['fileformat']            = 'shn';

    60         $getid3->info['audio']['dataformat']   = 'shn';

    61         $getid3->info['audio']['lossless']     = true;

    62         $getid3->info['audio']['bitrate_mode'] = 'vbr';

    63 

    64         $getid3->info['shn']['version'] = getid3_lib::LittleEndian2Int($shn_header{4});

    65 

    66         fseek($getid3->fp, $getid3->info['avdataend'] - 12, SEEK_SET);

    67         

    68         $seek_table_signature_test = fread($getid3->fp, 12);

    69         

    70         $getid3->info['shn']['seektable']['present'] = (bool)(substr($seek_table_signature_test, 4, 8) == 'SHNAMPSK');

    71         if ($getid3->info['shn']['seektable']['present']) {

    72         

    73             $getid3->info['shn']['seektable']['length'] = getid3_lib::LittleEndian2Int(substr($seek_table_signature_test, 0, 4));

    74             $getid3->info['shn']['seektable']['offset'] = $getid3->info['avdataend'] - $getid3->info['shn']['seektable']['length'];

    75             fseek($getid3->fp, $getid3->info['shn']['seektable']['offset'], SEEK_SET);

    76             $seek_table_magic = fread($getid3->fp, 4);

    77         

    78             if ($seek_table_magic != 'SEEK') {

    79 

    80                 throw new getid3_exception('Expecting "SEEK" at offset '.$getid3->info['shn']['seektable']['offset'].', found "'.$seek_table_magic.'"');

    81             } 

    82 

    83             $seek_table_data = fread($getid3->fp, $getid3->info['shn']['seektable']['length'] - 16);

    84             $getid3->info['shn']['seektable']['entry_count'] = floor(strlen($seek_table_data) / 80);

    85         }

    86 

    87         $commandline = 'shorten -x '.escapeshellarg(realpath($getid3->filename)).' - | head -c 64';

    88         $output = `$commandline`;

    89 

    90         if (@$output && substr($output, 12, 4) == 'fmt ') {

    91 

    92             $fmt_size = getid3_lib::LittleEndian2Int(substr($output, 16, 4));

    93             $decoded_wav_format_ex = getid3_riff::RIFFparseWAVEFORMATex(substr($output, 20, $fmt_size));

    94             

    95             $getid3->info['audio']['channels']        = $decoded_wav_format_ex['channels'];

    96             $getid3->info['audio']['bits_per_sample'] = $decoded_wav_format_ex['bits_per_sample'];

    97             $getid3->info['audio']['sample_rate']     = $decoded_wav_format_ex['sample_rate'];

    98 

    99             if (substr($output, 20 + $fmt_size, 4) == 'data') {

   100 

   101                 $getid3->info['playtime_seconds'] = getid3_lib::LittleEndian2Int(substr($output, 20 + 4 + $fmt_size, 4)) / $decoded_wav_format_ex['raw']['nAvgBytesPerSec'];

   102 

   103             } else {

   104 

   105                 throw new getid3_exception('shorten failed to decode DATA chunk to expected location, cannot determine playtime');

   106             }

   107 

   108             $getid3->info['audio']['bitrate'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) / $getid3->info['playtime_seconds']) * 8;

   109 

   110         } else {

   111 

   112             throw new getid3_exception('shorten failed to decode file to WAV for parsing');

   113             return false;

   114         }

   115 

   116         return true;

   117     }

   118 

   119 }

   120 

   121 ?>