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-video.nsv.php                                           |

    18 // | module for analyzing Nullsoft NSV files                              |

    19 // | dependencies: NONE                                                   |

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

    21 //

    22 // $Id: module.audio-video.nsv.php,v 1.3 2006/11/02 10:48:00 ah Exp $

    23 

    24         

    25         

    26 class getid3_nsv extends getid3_handler

    27 {

    28 

    29     public function Analyze() {

    30 

    31         $getid3 = $this->getid3;

    32 

    33         $getid3->info['fileformat']          = 'nsv';

    34         $getid3->info['audio']['dataformat'] = 'nsv';

    35         $getid3->info['video']['dataformat'] = 'nsv';

    36         $getid3->info['audio']['lossless']   = false;

    37         $getid3->info['video']['lossless']   = false;

    38 

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

    40         $nsv_header = fread($getid3->fp, 4);

    41 

    42         switch ($nsv_header) {

    43             

    44             case 'NSVs':

    45                 $this->getNSVsHeader();

    46                 break;

    47 

    48             case 'NSVf':

    49                 if ($this->getNSVfHeader()) {

    50                         $this->getNSVsHeader($getid3->info['nsv']['NSVf']['header_length']);

    51                 }

    52                 break;

    53 

    54             default:

    55                 throw new getid3_exception('Expecting "NSVs" or "NSVf" at offset '.$getid3->info['avdataoffset'].', found "'.$nsv_header.'"');

    56                 break;

    57         }

    58 

    59         if (!isset($getid3->info['nsv']['NSVf'])) {

    60             $getid3->warning('NSVf header not present - cannot calculate playtime or bitrate');

    61         }

    62 

    63         return true;

    64     }

    65 

    66 

    67 

    68     private function getNSVsHeader($file_offset = 0) {

    69         

    70         $getid3 = $this->getid3;

    71         

    72         fseek($getid3->fp, $file_offset, SEEK_SET);

    73         $nsvs_header = fread($getid3->fp, 28);

    74         

    75         $getid3->info['nsv']['NSVs'] = array ();

    76         $info_nsv_NSVs = &$getid3->info['nsv']['NSVs'];

    77 

    78         $info_nsv_NSVs['identifier'] = substr($nsvs_header, 0, 4);

    79         if ($info_nsv_NSVs['identifier'] != 'NSVs') {

    80             throw new getid3_exception('expected "NSVs" at offset ('.$file_offset.'), found "'.$info_nsv_NSVs['identifier'].'" instead');

    81         }

    82         

    83         $info_nsv_NSVs['offset'] = $file_offset;

    84         

    85         getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVs, $nsvs_header, 4,

    86             array (

    87                 'video_codec'     => -4,    // string

    88                 'audio_codec'     => -4,    // string

    89                 'resolution_x'    => 2,

    90                 'resolution_y'    => 2,

    91                 'framerate_index' => 1,

    92             )

    93         );

    94 

    95         if ($info_nsv_NSVs['audio_codec'] == 'PCM ') {

    96         

    97             getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVs, $nsvs_header, 24,

    98                 array (

    99                     'bits_channel' => 1,

   100                     'channels'     => 1,

   101                     'sample_rate'  => 2

   102                 )

   103             );

   104             $getid3->info['audio']['sample_rate'] = $info_nsv_NSVs['sample_rate'];

   105             

   106         }

   107 

   108         $getid3->info['video']['resolution_x']       = $info_nsv_NSVs['resolution_x'];

   109         $getid3->info['video']['resolution_y']       = $info_nsv_NSVs['resolution_y'];

   110         $info_nsv_NSVs['frame_rate']                 = getid3_nsv::NSVframerateLookup($info_nsv_NSVs['framerate_index']);

   111         $getid3->info['video']['frame_rate']         = $info_nsv_NSVs['frame_rate'];

   112         $getid3->info['video']['bits_per_sample']    = 24;

   113         $getid3->info['video']['pixel_aspect_ratio'] = (float)1;

   114 

   115         return true;

   116     }

   117 

   118 

   119 

   120     private function getNSVfHeader($file_offset = 0, $get_toc_offsets=false) {

   121         

   122         $getid3 = $this->getid3;

   123         

   124         fseek($getid3->fp, $file_offset, SEEK_SET);

   125         $nsvf_header = fread($getid3->fp, 28);

   126         

   127         $getid3->info['nsv']['NSVf'] = array ();

   128         $info_nsv_NSVf = &$getid3->info['nsv']['NSVf'];

   129         

   130         $info_nsv_NSVf['identifier'] = substr($nsvf_header, 0, 4);

   131         if ($info_nsv_NSVf['identifier'] != 'NSVf') {

   132             throw new getid3_exception('expected "NSVf" at offset ('.$file_offset.'), found "'.$info_nsv_NSVf['identifier'].'" instead');

   133         }

   134 

   135         $getid3->info['nsv']['NSVs']['offset']        = $file_offset;

   136 

   137         getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVf, $nsvf_header, 4,

   138             array (

   139                 'header_length' => 4,

   140                 'file_size'     => 4,

   141                 'playtime_ms'   => 4,

   142                 'meta_size'     => 4,

   143                 'TOC_entries_1' => 4,

   144                 'TOC_entries_2' => 4

   145             )

   146         );

   147                 

   148         if ($info_nsv_NSVf['playtime_ms'] == 0) {

   149             throw new getid3_exception('Corrupt NSV file: NSVf.playtime_ms == zero');

   150         }

   151         

   152         if ($info_nsv_NSVf['file_size'] > $getid3->info['avdataend']) {

   153             $getid3->warning('truncated file - NSVf header indicates '.$info_nsv_NSVf['file_size'].' bytes, file actually '.$getid3->info['avdataend'].' bytes');

   154         }

   155 

   156         $nsvf_header .= fread($getid3->fp, $info_nsv_NSVf['meta_size'] + (4 * $info_nsv_NSVf['TOC_entries_1']) + (4 * $info_nsv_NSVf['TOC_entries_2']));

   157         $nsvf_headerlength = strlen($nsvf_header);

   158         $info_nsv_NSVf['metadata'] = substr($nsvf_header, 28, $info_nsv_NSVf['meta_size']);

   159 

   160         $offset = 28 + $info_nsv_NSVf['meta_size'];

   161         if ($get_toc_offsets) {

   162             $toc_counter = 0;

   163             while ($toc_counter < $info_nsv_NSVf['TOC_entries_1']) {

   164                 if ($toc_counter < $info_nsv_NSVf['TOC_entries_1']) {

   165                     $info_nsv_NSVf['TOC_1'][$toc_counter] = getid3_lib::LittleEndian2Int(substr($nsvf_header, $offset, 4));

   166                     $offset += 4;

   167                     $toc_counter++;

   168                 }

   169             }

   170         }

   171 

   172         if (trim($info_nsv_NSVf['metadata']) != '') {

   173             $info_nsv_NSVf['metadata'] = str_replace('`', "\x01", $info_nsv_NSVf['metadata']);

   174             $comment_pair_array = explode("\x01".' ', $info_nsv_NSVf['metadata']);

   175             foreach ($comment_pair_array as $comment_pair) {

   176                 if (strstr($comment_pair, '='."\x01")) {

   177                     list($key, $value) = explode('='."\x01", $comment_pair, 2);

   178                     $getid3->info['nsv']['comments'][strtolower($key)][] = trim(str_replace("\x01", '', $value));

   179                 }

   180             }

   181         }

   182 

   183         $getid3->info['playtime_seconds'] = $info_nsv_NSVf['playtime_ms'] / 1000;

   184         $getid3->info['bitrate']          = ($info_nsv_NSVf['file_size'] * 8) / $getid3->info['playtime_seconds'];

   185 

   186         return true;

   187     }

   188 

   189 

   190 

   191     public static function NSVframerateLookup($frame_rate_index) {

   192         

   193         if ($frame_rate_index <= 127) {

   194             return (float)$frame_rate_index;

   195         }

   196 

   197         static $lookup = array (

   198             129 => 29.970,

   199             131 => 23.976,

   200             133 => 14.985,

   201             197 => 59.940,

   202             199 => 47.952

   203         );

   204         return (isset($lookup[$frame_rate_index]) ? $lookup[$frame_rate_index] : false);

   205     }

   206 

   207 }

   208 

   209 

   210 ?>
author	Robert McIntyre <rlm@mit.edu>
date	Tue, 22 Jun 2010 13:41:04 -0400
parents	3f6b44aa6b35
children