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1 <?php
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2 // +----------------------------------------------------------------------+
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3 // | PHP version 5 |
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4 // +----------------------------------------------------------------------+
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5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
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6 // +----------------------------------------------------------------------+
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7 // | This source file is subject to version 2 of the GPL license, |
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8 // | that is bundled with this package in the file license.txt and is |
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9 // | available through the world-wide-web at the following url: |
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10 // | http://www.gnu.org/copyleft/gpl.html |
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11 // +----------------------------------------------------------------------+
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12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
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13 // +----------------------------------------------------------------------+
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14 // | Authors: James Heinrich <infoØgetid3*org> |
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15 // | Allan Hansen <ahØartemis*dk> |
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16 // +----------------------------------------------------------------------+
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17 // | module.graphic.gif.php |
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18 // | Module for analyzing CompuServe GIF graphic files. |
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19 // | dependencies: NONE |
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20 // +----------------------------------------------------------------------+
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21 //
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22 // $Id: module.graphic.gif.php,v 1.2 2006/11/02 10:48:02 ah Exp $
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23
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24
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25
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26 class getid3_gif extends getid3_handler
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27 {
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28
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29 public function Analyze() {
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30
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31 $getid3 = $this->getid3;
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32
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33 $getid3->info['fileformat'] = 'gif';
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34 $getid3->info['video']['dataformat'] = 'gif';
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35 $getid3->info['video']['lossless'] = true;
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36 $getid3->info['video']['pixel_aspect_ratio'] = (float)1;
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37
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38 $getid3->info['gif']['header'] = array ();
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39 $info_gif_header = &$getid3->info['gif']['header'];
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40
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41 fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
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42 $gif_header = fread($getid3->fp, 13);
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43
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44 // Magic bytes
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45 $info_gif_header['raw']['identifier'] = 'GIF';
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46
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47 getid3_lib::ReadSequence('LittleEndian2Int', $info_gif_header['raw'], $gif_header, 3,
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48 array (
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49 'version' => -3, // string
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50 'width' => 2,
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51 'height' => 2,
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52 'flags' => 1,
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53 'bg_color_index' => 1,
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54 'aspect_ratio' => 1
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55 )
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56 );
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57
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58 $getid3->info['video']['resolution_x'] = $info_gif_header['raw']['width'];
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59 $getid3->info['video']['resolution_y'] = $info_gif_header['raw']['height'];
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60 $getid3->info['gif']['version'] = $info_gif_header['raw']['version'];
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61
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62 $info_gif_header['flags']['global_color_table'] = (bool)($info_gif_header['raw']['flags'] & 0x80);
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63
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64 if ($info_gif_header['raw']['flags'] & 0x80) {
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65 // Number of bits per primary color available to the original image, minus 1
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66 $info_gif_header['bits_per_pixel'] = 3 * ((($info_gif_header['raw']['flags'] & 0x70) >> 4) + 1);
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67 } else {
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68 $info_gif_header['bits_per_pixel'] = 0;
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69 }
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70
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71 $info_gif_header['flags']['global_color_sorted'] = (bool)($info_gif_header['raw']['flags'] & 0x40);
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72 if ($info_gif_header['flags']['global_color_table']) {
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73 // the number of bytes contained in the Global Color Table. To determine that
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74 // actual size of the color table, raise 2 to [the value of the field + 1]
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75 $info_gif_header['global_color_size'] = pow(2, ($info_gif_header['raw']['flags'] & 0x07) + 1);
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76 $getid3->info['video']['bits_per_sample'] = ($info_gif_header['raw']['flags'] & 0x07) + 1;
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77 } else {
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78 $info_gif_header['global_color_size'] = 0;
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79 }
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80
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81 if ($info_gif_header['raw']['aspect_ratio'] != 0) {
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82 // Aspect Ratio = (Pixel Aspect Ratio + 15) / 64
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83 $info_gif_header['aspect_ratio'] = ($info_gif_header['raw']['aspect_ratio'] + 15) / 64;
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84 }
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85
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86 return true;
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87 }
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88
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89 }
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90
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91
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92 ?> |
