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.au.php                                                  |

    18 // | module for analyzing AU files                                        |

    19 // | dependencies: NONE                                                   |

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

    21 //

    22 // $Id: module.audio.au.php,v 1.2 2006/11/02 10:48:01 ah Exp $

    23 

    24         

    25         

    26 class getid3_au extends getid3_handler

    27 {

    28 

    29     public function Analyze() {

    30 

    31         $getid3 = $this->getid3;

    32         

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

    34         $au_header  = fread($getid3->fp, 8);

    35 

    36         // Magic bytes: .snd

    37 

    38         $getid3->info['au'] = array ();

    39         $info_au = &$getid3->info['au'];

    40 

    41         $getid3->info['fileformat']            = 'au';

    42         $getid3->info['audio']['dataformat']   = 'au';

    43         $getid3->info['audio']['bitrate_mode'] = 'cbr';

    44         $info_au['encoding']                   = 'ISO-8859-1';

    45 

    46         $info_au['header_length']   = getid3_lib::BigEndian2Int(substr($au_header,  4, 4));

    47         $au_header .= fread($getid3->fp, $info_au['header_length'] - 8);

    48         $getid3->info['avdataoffset'] += $info_au['header_length'];

    49 

    50         getid3_lib::ReadSequence('BigEndian2Int', $info_au, $au_header, 8,  

    51             array (

    52                 'data_size'     => 4,

    53                 'data_format_id'=> 4,

    54                 'sample_rate'   => 4,

    55                 'channels'      => 4

    56             )

    57         );

    58         $info_au['comments']['comment'][] = trim(substr($au_header, 24));

    59 

    60         $info_au['data_format']          = getid3_au::AUdataFormatNameLookup($info_au['data_format_id']);

    61         $info_au['used_bits_per_sample'] = getid3_au::AUdataFormatUsedBitsPerSampleLookup($info_au['data_format_id']);

    62         if ($info_au['bits_per_sample']  = getid3_au::AUdataFormatBitsPerSampleLookup($info_au['data_format_id'])) {

    63             $getid3->info['audio']['bits_per_sample'] = $info_au['bits_per_sample'];

    64         } else {

    65             unset($info_au['bits_per_sample']);

    66         }

    67 

    68         $getid3->info['audio']['sample_rate'] = $info_au['sample_rate'];

    69         $getid3->info['audio']['channels']    = $info_au['channels'];

    70 

    71         if (($getid3->info['avdataoffset'] + $info_au['data_size']) > $getid3->info['avdataend']) {

    72             $getid3->warning('Possible truncated file - expecting "'.$info_au['data_size'].'" bytes of audio data, only found '.($getid3->info['avdataend'] - $getid3->info['avdataoffset']).' bytes"');

    73         }

    74 

    75         $getid3->info['playtime_seconds'] = $info_au['data_size'] / ($info_au['sample_rate'] * $info_au['channels'] * ($info_au['used_bits_per_sample'] / 8));

    76         $getid3->info['audio']['bitrate'] = ($info_au['data_size'] * 8) / $getid3->info['playtime_seconds'];

    77 

    78         return true;

    79     }

    80 

    81 

    82 

    83     public static function AUdataFormatNameLookup($id) {

    84         

    85         static $lookup = array (

    86             0  => 'unspecified format',

    87             1  => '8-bit mu-law',

    88             2  => '8-bit linear',

    89             3  => '16-bit linear',

    90             4  => '24-bit linear',

    91             5  => '32-bit linear',

    92             6  => 'floating-point',

    93             7  => 'double-precision float',

    94             8  => 'fragmented sampled data',

    95             9  => 'SUN_FORMAT_NESTED',

    96             10 => 'DSP program',

    97             11 => '8-bit fixed-point',

    98             12 => '16-bit fixed-point',

    99             13 => '24-bit fixed-point',

   100             14 => '32-bit fixed-point',

   101 

   102             16 => 'non-audio display data',

   103             17 => 'SND_FORMAT_MULAW_SQUELCH',

   104             18 => '16-bit linear with emphasis',

   105             19 => '16-bit linear with compression',

   106             20 => '16-bit linear with emphasis + compression',

   107             21 => 'Music Kit DSP commands',

   108             22 => 'SND_FORMAT_DSP_COMMANDS_SAMPLES',

   109             23 => 'CCITT g.721 4-bit ADPCM',

   110             24 => 'CCITT g.722 ADPCM',

   111             25 => 'CCITT g.723 3-bit ADPCM',

   112             26 => 'CCITT g.723 5-bit ADPCM',

   113             27 => 'A-Law 8-bit'

   114         );

   115         

   116         return (isset($lookup[$id]) ? $lookup[$id] : false);

   117     }

   118 

   119 

   120 

   121     public static function AUdataFormatBitsPerSampleLookup($id) {

   122         

   123         static $lookup = array (

   124             1  => 8,

   125             2  => 8,

   126             3  => 16,

   127             4  => 24,

   128             5  => 32,

   129             6  => 32,

   130             7  => 64,

   131 

   132             11 => 8,

   133             12 => 16,

   134             13 => 24,

   135             14 => 32,

   136 

   137             18 => 16,

   138             19 => 16,

   139             20 => 16,

   140 

   141             23 => 16,

   142 

   143             25 => 16,

   144             26 => 16,

   145             27 => 8

   146         );

   147         return (isset($lookup[$id]) ? $lookup[$id] : false);

   148     }

   149 

   150 

   151 

   152     public static function AUdataFormatUsedBitsPerSampleLookup($id) {

   153         

   154         static $lookup = array (

   155             1  => 8,

   156             2  => 8,

   157             3  => 16,

   158             4  => 24,

   159             5  => 32,

   160             6  => 32,

   161             7  => 64,

   162 

   163             11 => 8,

   164             12 => 16,

   165             13 => 24,

   166             14 => 32,

   167 

   168             18 => 16,

   169             19 => 16,

   170             20 => 16,

   171 

   172             23 => 4,

   173 

   174             25 => 3,

   175             26 => 5,

   176             27 => 8,

   177         );

   178         return (isset($lookup[$id]) ? $lookup[$id] : false);

   179     }

   180 

   181 }

   182 

   183 

   184 ?>
author	Robert McIntyre <rlm@mit.edu>
date	Tue, 29 Dec 2015 16:26:18 -0800
parents	3f6b44aa6b35
children