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Diffstat (limited to 'modules/getid3/module.graphic.gif.php')
| -rw-r--r-- | modules/getid3/module.graphic.gif.php | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/modules/getid3/module.graphic.gif.php b/modules/getid3/module.graphic.gif.php new file mode 100644 index 00000000..b3b11398 --- /dev/null +++ b/modules/getid3/module.graphic.gif.php @@ -0,0 +1,92 @@ +<?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 <infoØgetid3*org> |
+// | Allan Hansen <ahØartemis*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; + } + +} + + +?>
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