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.swf.php                                           |

    18 // | module for analyzing Macromedia Shockwave Flash files.               |

    19 // | dependencies: zlib support in PHP                                    |

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

    21 //

    22 // $Id: module.audio-video.swf.php,v 1.2 2006/11/02 10:48:00 ah Exp $

    23 

    24         

    25         

    26 class getid3_swf extends getid3_handler

    27 {

    28 

    29     public function Analyze() {

    30         

    31         $getid3 = $this->getid3;

    32         

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

    34         $getid3->info['video']['dataformat'] = 'swf';

    35 

    36         // http://www.openswf.org/spec/SWFfileformat.html

    37 

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

    39 

    40         $swf_file_data = fread($getid3->fp, $getid3->info['avdataend'] - $getid3->info['avdataoffset']); // 8 + 2 + 2 + max(9) bytes NOT including Frame_Size RECT data

    41 

    42         $getid3->info['swf']['header']['signature']   = substr($swf_file_data, 0, 3);

    43         switch ($getid3->info['swf']['header']['signature']) {

    44         

    45             case 'FWS':

    46                 $getid3->info['swf']['header']['compressed'] = false;

    47                 break;

    48 

    49             case 'CWS':

    50                 $getid3->info['swf']['header']['compressed'] = true;

    51                 break;

    52 

    53             default:

    54                 throw new getid3_exception('Expecting "FWS" or "CWS" at offset '.$getid3->info['avdataoffset'].', found "'.$getid3->info['swf']['header']['signature'].'"');

    55         }

    56         $getid3->info['swf']['header']['version'] = getid3_lib::LittleEndian2Int($swf_file_data{3});

    57         $getid3->info['swf']['header']['length']  = getid3_lib::LittleEndian2Int(substr($swf_file_data, 4, 4));

    58 

    59         if (!function_exists('gzuncompress')) {

    60             throw new getid3_exception('getid3_swf requires --zlib support in PHP.');

    61         }

    62 

    63         if ($getid3->info['swf']['header']['compressed']) {

    64 

    65             if ($uncompressed_file_data = @gzuncompress(substr($swf_file_data, 8))) {

    66                 $swf_file_data = substr($swf_file_data, 0, 8).$uncompressed_file_data;

    67 

    68             } else {

    69                 throw new getid3_exception('Error decompressing compressed SWF data');

    70             }

    71 

    72         }

    73 

    74         $frame_size_bits_per_value = (ord(substr($swf_file_data, 8, 1)) & 0xF8) >> 3;

    75         $frame_size_data_length    = ceil((5 + (4 * $frame_size_bits_per_value)) / 8);

    76         $frame_size_data_string    = str_pad(decbin(ord($swf_file_data[8]) & 0x07), 3, '0', STR_PAD_LEFT);

    77         

    78         for ($i = 1; $i < $frame_size_data_length; $i++) {

    79             $frame_size_data_string .= str_pad(decbin(ord(substr($swf_file_data, 8 + $i, 1))), 8, '0', STR_PAD_LEFT);

    80         }

    81         

    82         list($x1, $x2, $y1, $y2) = explode("\n", wordwrap($frame_size_data_string, $frame_size_bits_per_value, "\n", 1));

    83         $getid3->info['swf']['header']['frame_width']  = bindec($x2);

    84         $getid3->info['swf']['header']['frame_height'] = bindec($y2);

    85 

    86         // http://www-lehre.informatik.uni-osnabrueck.de/~fbstark/diplom/docs/swf/Flash_Uncovered.htm

    87         // Next in the header is the frame rate, which is kind of weird.

    88         // It is supposed to be stored as a 16bit integer, but the first byte

    89         // (or last depending on how you look at it) is completely ignored.

    90         // Example: 0x000C  ->  0x0C  ->  12     So the frame rate is 12 fps.

    91 

    92         // Byte at (8 + $frame_size_data_length) is always zero and ignored

    93         $getid3->info['swf']['header']['frame_rate']  = getid3_lib::LittleEndian2Int($swf_file_data[9 + $frame_size_data_length]);

    94         $getid3->info['swf']['header']['frame_count'] = getid3_lib::LittleEndian2Int(substr($swf_file_data, 10 + $frame_size_data_length, 2));

    95 

    96         $getid3->info['video']['frame_rate']         = $getid3->info['swf']['header']['frame_rate'];

    97         $getid3->info['video']['resolution_x']       = intval(round($getid3->info['swf']['header']['frame_width']  / 20));

    98         $getid3->info['video']['resolution_y']       = intval(round($getid3->info['swf']['header']['frame_height'] / 20));

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

   100 

   101         if (($getid3->info['swf']['header']['frame_count'] > 0) && ($getid3->info['swf']['header']['frame_rate'] > 0)) {

   102             $getid3->info['playtime_seconds'] = $getid3->info['swf']['header']['frame_count'] / $getid3->info['swf']['header']['frame_rate'];

   103         }

   104 

   105 

   106         // SWF tags

   107 

   108         $current_offset = 12 + $frame_size_data_length;

   109         $swf_data_length = strlen($swf_file_data);

   110 

   111         while ($current_offset < $swf_data_length) {

   112 

   113             $tag_ID_tag_length = getid3_lib::LittleEndian2Int(substr($swf_file_data, $current_offset, 2));

   114             $tag_ID     = ($tag_ID_tag_length & 0xFFFC) >> 6;

   115             $tag_length = ($tag_ID_tag_length & 0x003F);

   116             $current_offset += 2;

   117             if ($tag_length == 0x3F) {

   118                 $tag_length = getid3_lib::LittleEndian2Int(substr($swf_file_data, $current_offset, 4));

   119                 $current_offset += 4;

   120             }

   121 

   122             unset($tag_data);

   123             $tag_data['offset'] = $current_offset;

   124             $tag_data['size']   = $tag_length;

   125             $tag_data['id']     = $tag_ID;

   126             $tag_data['data']   = substr($swf_file_data, $current_offset, $tag_length);

   127             switch ($tag_ID) {

   128                 

   129                 case 0: // end of movie

   130                     break 2;

   131 

   132                 case 9: // Set background color

   133                     $getid3->info['swf']['bgcolor'] = strtoupper(str_pad(dechex(getid3_lib::BigEndian2Int($tag_data['data'])), 6, '0', STR_PAD_LEFT));

   134                     break;

   135 

   136                 default:

   137                     /*

   138                     if ($ReturnAllTagData) {

   139                         $getid3->info['swf']['tags'][] = $tag_data;

   140                     }

   141                     */

   142                     break;

   143             }

   144 

   145             $current_offset += $tag_length;

   146         }

   147 

   148         return true;

   149     }

   150 

   151 }

   152 

   153 

   154 ?>
author	rlm
date	Mon, 12 Apr 2010 03:30:00 -0400
parents	3f6b44aa6b35
children