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.graphic.gif.php                                               |

    18 // | Module for analyzing CompuServe GIF graphic files.                   |

    19 // | dependencies: NONE                                                   |

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

    21 //

    22 // $Id: module.graphic.gif.php,v 1.2 2006/11/02 10:48:02 ah Exp $

    23 

    24         

    25         

    26 class getid3_gif extends getid3_handler

    27 {

    28 

    29     public function Analyze() {

    30         

    31         $getid3 = $this->getid3;

    32 

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

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

    35         $getid3->info['video']['lossless']           = true;

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

    37         

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

    39         $info_gif_header = &$getid3->info['gif']['header'];

    40 

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

    42         $gif_header = fread($getid3->fp, 13);

    43 

    44         // Magic bytes

    45         $info_gif_header['raw']['identifier'] = 'GIF';

    46         

    47         getid3_lib::ReadSequence('LittleEndian2Int', $info_gif_header['raw'], $gif_header, 3,

    48             array (

    49                 'version'        => -3,      // string

    50                 'width'          => 2,

    51                 'height'         => 2,

    52                 'flags'          => 1,

    53                 'bg_color_index' => 1,

    54                 'aspect_ratio'   => 1

    55             )

    56         );

    57 

    58         $getid3->info['video']['resolution_x'] = $info_gif_header['raw']['width'];

    59         $getid3->info['video']['resolution_y'] = $info_gif_header['raw']['height'];

    60         $getid3->info['gif']['version']        = $info_gif_header['raw']['version'];

    61         

    62         $info_gif_header['flags']['global_color_table'] = (bool)($info_gif_header['raw']['flags'] & 0x80);

    63         

    64         if ($info_gif_header['raw']['flags'] & 0x80) {

    65             // Number of bits per primary color available to the original image, minus 1

    66             $info_gif_header['bits_per_pixel']  = 3 * ((($info_gif_header['raw']['flags'] & 0x70) >> 4) + 1);

    67         } else {

    68             $info_gif_header['bits_per_pixel']  = 0;

    69         }

    70         

    71         $info_gif_header['flags']['global_color_sorted'] = (bool)($info_gif_header['raw']['flags'] & 0x40);

    72         if ($info_gif_header['flags']['global_color_table']) {

    73             // the number of bytes contained in the Global Color Table. To determine that

    74             // actual size of the color table, raise 2 to [the value of the field + 1]

    75             $info_gif_header['global_color_size'] = pow(2, ($info_gif_header['raw']['flags'] & 0x07) + 1);

    76             $getid3->info['video']['bits_per_sample']           = ($info_gif_header['raw']['flags'] & 0x07) + 1;

    77         } else {

    78             $info_gif_header['global_color_size'] = 0;

    79         }

    80         

    81         if ($info_gif_header['raw']['aspect_ratio'] != 0) {

    82             // Aspect Ratio = (Pixel Aspect Ratio + 15) / 64

    83             $info_gif_header['aspect_ratio'] = ($info_gif_header['raw']['aspect_ratio'] + 15) / 64;

    84         }

    85 

    86         return true;

    87     }

    88 

    89 }

    90 

    91 

    92 ?>
author	Robert McIntyre <rlm@mit.edu>
date	Mon, 11 Jul 2011 03:06:13 -0400
parents	3f6b44aa6b35
children