rlm@3: <?php
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | PHP version 5                                                        |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen                 |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | This source file is subject to version 2 of the GPL license,         |
rlm@3: // | that is bundled with this package in the file license.txt and is     |
rlm@3: // | available through the world-wide-web at the following url:           |
rlm@3: // | http://www.gnu.org/copyleft/gpl.html                                 |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org    |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | Authors: James Heinrich <infoØgetid3*org>                            |
rlm@3: // |          Allan Hansen <ahØartemis*dk>                                |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | module.graphic.gif.php                                               |
rlm@3: // | Module for analyzing CompuServe GIF graphic files.                   |
rlm@3: // | dependencies: NONE                                                   |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: //
rlm@3: // $Id: module.graphic.gif.php,v 1.2 2006/11/02 10:48:02 ah Exp $
rlm@3: 
rlm@3:         
rlm@3:         
rlm@3: class getid3_gif extends getid3_handler
rlm@3: {
rlm@3: 
rlm@3:     public function Analyze() {
rlm@3:         
rlm@3:         $getid3 = $this->getid3;
rlm@3: 
rlm@3:         $getid3->info['fileformat']                  = 'gif';
rlm@3:         $getid3->info['video']['dataformat']         = 'gif';
rlm@3:         $getid3->info['video']['lossless']           = true;
rlm@3:         $getid3->info['video']['pixel_aspect_ratio'] = (float)1;
rlm@3:         
rlm@3:         $getid3->info['gif']['header'] = array ();
rlm@3:         $info_gif_header = &$getid3->info['gif']['header'];
rlm@3: 
rlm@3:         fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
rlm@3:         $gif_header = fread($getid3->fp, 13);
rlm@3: 
rlm@3:         // Magic bytes
rlm@3:         $info_gif_header['raw']['identifier'] = 'GIF';
rlm@3:         
rlm@3:         getid3_lib::ReadSequence('LittleEndian2Int', $info_gif_header['raw'], $gif_header, 3,
rlm@3:             array (
rlm@3:                 'version'        => -3,      // string
rlm@3:                 'width'          => 2,
rlm@3:                 'height'         => 2,
rlm@3:                 'flags'          => 1,
rlm@3:                 'bg_color_index' => 1,
rlm@3:                 'aspect_ratio'   => 1
rlm@3:             )
rlm@3:         );
rlm@3: 
rlm@3:         $getid3->info['video']['resolution_x'] = $info_gif_header['raw']['width'];
rlm@3:         $getid3->info['video']['resolution_y'] = $info_gif_header['raw']['height'];
rlm@3:         $getid3->info['gif']['version']        = $info_gif_header['raw']['version'];
rlm@3:         
rlm@3:         $info_gif_header['flags']['global_color_table'] = (bool)($info_gif_header['raw']['flags'] & 0x80);
rlm@3:         
rlm@3:         if ($info_gif_header['raw']['flags'] & 0x80) {
rlm@3:             // Number of bits per primary color available to the original image, minus 1
rlm@3:             $info_gif_header['bits_per_pixel']  = 3 * ((($info_gif_header['raw']['flags'] & 0x70) >> 4) + 1);
rlm@3:         } else {
rlm@3:             $info_gif_header['bits_per_pixel']  = 0;
rlm@3:         }
rlm@3:         
rlm@3:         $info_gif_header['flags']['global_color_sorted'] = (bool)($info_gif_header['raw']['flags'] & 0x40);
rlm@3:         if ($info_gif_header['flags']['global_color_table']) {
rlm@3:             // the number of bytes contained in the Global Color Table. To determine that
rlm@3:             // actual size of the color table, raise 2 to [the value of the field + 1]
rlm@3:             $info_gif_header['global_color_size'] = pow(2, ($info_gif_header['raw']['flags'] & 0x07) + 1);
rlm@3:             $getid3->info['video']['bits_per_sample']           = ($info_gif_header['raw']['flags'] & 0x07) + 1;
rlm@3:         } else {
rlm@3:             $info_gif_header['global_color_size'] = 0;
rlm@3:         }
rlm@3:         
rlm@3:         if ($info_gif_header['raw']['aspect_ratio'] != 0) {
rlm@3:             // Aspect Ratio = (Pixel Aspect Ratio + 15) / 64
rlm@3:             $info_gif_header['aspect_ratio'] = ($info_gif_header['raw']['aspect_ratio'] + 15) / 64;
rlm@3:         }
rlm@3: 
rlm@3:         return true;
rlm@3:     }
rlm@3: 
rlm@3: }
rlm@3: 
rlm@3: 
rlm@3: ?>