1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
<?php
// +----------------------------------------------------------------------+
// | PHP version 5 |
// +----------------------------------------------------------------------+
// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2 of the GPL license, |
// | that is bundled with this package in the file license.txt and is |
// | available through the world-wide-web at the following url: |
// | http://www.gnu.org/copyleft/gpl.html |
// +----------------------------------------------------------------------+
// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
// +----------------------------------------------------------------------+
// | Authors: James Heinrich <info�getid3*org> |
// | Allan Hansen <ah�artemis*dk> |
// +----------------------------------------------------------------------+
// | module.graphic.gif.php |
// | Module for analyzing CompuServe GIF graphic files. |
// | dependencies: NONE |
// +----------------------------------------------------------------------+
//
// $Id: module.graphic.gif.php,v 1.2 2006/11/02 10:48:02 ah Exp $
class getid3_gif extends getid3_handler
{
public function Analyze() {
$getid3 = $this->getid3;
$getid3->info['fileformat'] = 'gif';
$getid3->info['video']['dataformat'] = 'gif';
$getid3->info['video']['lossless'] = true;
$getid3->info['video']['pixel_aspect_ratio'] = (float)1;
$getid3->info['gif']['header'] = array ();
$info_gif_header = &$getid3->info['gif']['header'];
fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
$gif_header = fread($getid3->fp, 13);
// Magic bytes
$info_gif_header['raw']['identifier'] = 'GIF';
getid3_lib::ReadSequence('LittleEndian2Int', $info_gif_header['raw'], $gif_header, 3,
array (
'version' => -3, // string
'width' => 2,
'height' => 2,
'flags' => 1,
'bg_color_index' => 1,
'aspect_ratio' => 1
)
);
$getid3->info['video']['resolution_x'] = $info_gif_header['raw']['width'];
$getid3->info['video']['resolution_y'] = $info_gif_header['raw']['height'];
$getid3->info['gif']['version'] = $info_gif_header['raw']['version'];
$info_gif_header['flags']['global_color_table'] = (bool)($info_gif_header['raw']['flags'] & 0x80);
if ($info_gif_header['raw']['flags'] & 0x80) {
// Number of bits per primary color available to the original image, minus 1
$info_gif_header['bits_per_pixel'] = 3 * ((($info_gif_header['raw']['flags'] & 0x70) >> 4) + 1);
} else {
$info_gif_header['bits_per_pixel'] = 0;
}
$info_gif_header['flags']['global_color_sorted'] = (bool)($info_gif_header['raw']['flags'] & 0x40);
if ($info_gif_header['flags']['global_color_table']) {
// the number of bytes contained in the Global Color Table. To determine that
// actual size of the color table, raise 2 to [the value of the field + 1]
$info_gif_header['global_color_size'] = pow(2, ($info_gif_header['raw']['flags'] & 0x07) + 1);
$getid3->info['video']['bits_per_sample'] = ($info_gif_header['raw']['flags'] & 0x07) + 1;
} else {
$info_gif_header['global_color_size'] = 0;
}
if ($info_gif_header['raw']['aspect_ratio'] != 0) {
// Aspect Ratio = (Pixel Aspect Ratio + 15) / 64
$info_gif_header['aspect_ratio'] = ($info_gif_header['raw']['aspect_ratio'] + 15) / 64;
}
return true;
}
}
?>
|
