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-rw-r--r--getid3/module.graphic.gif.php183
1 files changed, 183 insertions, 0 deletions
diff --git a/getid3/module.graphic.gif.php b/getid3/module.graphic.gif.php
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+<?php
+/////////////////////////////////////////////////////////////////
+/// getID3() by James Heinrich <info@getid3.org> //
+// available at http://getid3.sourceforge.net //
+// or http://www.getid3.org //
+/////////////////////////////////////////////////////////////////
+// See readme.txt for more details //
+/////////////////////////////////////////////////////////////////
+// //
+// module.graphic.gif.php //
+// module for analyzing GIF Image files //
+// dependencies: NONE //
+// ///
+/////////////////////////////////////////////////////////////////
+
+
+class getid3_gif
+{
+
+ function getid3_gif(&$fd, &$ThisFileInfo) {
+ $ThisFileInfo['fileformat'] = 'gif';
+ $ThisFileInfo['video']['dataformat'] = 'gif';
+ $ThisFileInfo['video']['lossless'] = true;
+ $ThisFileInfo['video']['pixel_aspect_ratio'] = (float) 1;
+
+ fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
+ $GIFheader = fread($fd, 13);
+ $offset = 0;
+
+ $ThisFileInfo['gif']['header']['raw']['identifier'] = substr($GIFheader, $offset, 3);
+ $offset += 3;
+
+ if ($ThisFileInfo['gif']['header']['raw']['identifier'] != 'GIF') {
+ $ThisFileInfo['error'][] = 'Expecting "GIF" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$ThisFileInfo['gif']['header']['raw']['identifier'].'"';
+ unset($ThisFileInfo['fileformat']);
+ unset($ThisFileInfo['gif']);
+ return false;
+ }
+
+ $ThisFileInfo['gif']['header']['raw']['version'] = substr($GIFheader, $offset, 3);
+ $offset += 3;
+ $ThisFileInfo['gif']['header']['raw']['width'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2));
+ $offset += 2;
+ $ThisFileInfo['gif']['header']['raw']['height'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2));
+ $offset += 2;
+ $ThisFileInfo['gif']['header']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
+ $offset += 1;
+ $ThisFileInfo['gif']['header']['raw']['bg_color_index'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
+ $offset += 1;
+ $ThisFileInfo['gif']['header']['raw']['aspect_ratio'] = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
+ $offset += 1;
+
+ $ThisFileInfo['video']['resolution_x'] = $ThisFileInfo['gif']['header']['raw']['width'];
+ $ThisFileInfo['video']['resolution_y'] = $ThisFileInfo['gif']['header']['raw']['height'];
+ $ThisFileInfo['gif']['version'] = $ThisFileInfo['gif']['header']['raw']['version'];
+ $ThisFileInfo['gif']['header']['flags']['global_color_table'] = (bool) ($ThisFileInfo['gif']['header']['raw']['flags'] & 0x80);
+ if ($ThisFileInfo['gif']['header']['raw']['flags'] & 0x80) {
+ // Number of bits per primary color available to the original image, minus 1
+ $ThisFileInfo['gif']['header']['bits_per_pixel'] = 3 * ((($ThisFileInfo['gif']['header']['raw']['flags'] & 0x70) >> 4) + 1);
+ } else {
+ $ThisFileInfo['gif']['header']['bits_per_pixel'] = 0;
+ }
+ $ThisFileInfo['gif']['header']['flags']['global_color_sorted'] = (bool) ($ThisFileInfo['gif']['header']['raw']['flags'] & 0x40);
+ if ($ThisFileInfo['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]
+ $ThisFileInfo['gif']['header']['global_color_size'] = pow(2, ($ThisFileInfo['gif']['header']['raw']['flags'] & 0x07) + 1);
+ $ThisFileInfo['video']['bits_per_sample'] = ($ThisFileInfo['gif']['header']['raw']['flags'] & 0x07) + 1;
+ } else {
+ $ThisFileInfo['gif']['header']['global_color_size'] = 0;
+ }
+ if ($ThisFileInfo['gif']['header']['raw']['aspect_ratio'] != 0) {
+ // Aspect Ratio = (Pixel Aspect Ratio + 15) / 64
+ $ThisFileInfo['gif']['header']['aspect_ratio'] = ($ThisFileInfo['gif']['header']['raw']['aspect_ratio'] + 15) / 64;
+ }
+
+// if ($ThisFileInfo['gif']['header']['flags']['global_color_table']) {
+// $GIFcolorTable = fread($fd, 3 * $ThisFileInfo['gif']['header']['global_color_size']);
+// $offset = 0;
+// for ($i = 0; $i < $ThisFileInfo['gif']['header']['global_color_size']; $i++) {
+// $red = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
+// $green = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
+// $blue = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
+// $ThisFileInfo['gif']['global_color_table'][$i] = (($red << 16) | ($green << 8) | ($blue));
+// }
+// }
+//
+// // Image Descriptor
+// while (!feof($fd)) {
+// $NextBlockTest = fread($fd, 1);
+// switch ($NextBlockTest) {
+//
+// case ',': // ',' - Image separator character
+//
+// $ImageDescriptorData = $NextBlockTest.fread($fd, 9);
+// $ImageDescriptor = array();
+// $ImageDescriptor['image_left'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 1, 2));
+// $ImageDescriptor['image_top'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 3, 2));
+// $ImageDescriptor['image_width'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 5, 2));
+// $ImageDescriptor['image_height'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 7, 2));
+// $ImageDescriptor['flags_raw'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 9, 1));
+// $ImageDescriptor['flags']['use_local_color_map'] = (bool) ($ImageDescriptor['flags_raw'] & 0x80);
+// $ImageDescriptor['flags']['image_interlaced'] = (bool) ($ImageDescriptor['flags_raw'] & 0x40);
+// $ThisFileInfo['gif']['image_descriptor'][] = $ImageDescriptor;
+//
+// if ($ImageDescriptor['flags']['use_local_color_map']) {
+//
+// $ThisFileInfo['warning'][] = 'This version of getID3() cannot parse local color maps for GIFs';
+// return true;
+//
+// }
+//echo 'Start of raster data: '.ftell($fd).'<BR>';
+// $RasterData = array();
+// $RasterData['code_size'] = getid3_lib::LittleEndian2Int(fread($fd, 1));
+// $RasterData['block_byte_count'] = getid3_lib::LittleEndian2Int(fread($fd, 1));
+// $ThisFileInfo['gif']['raster_data'][count($ThisFileInfo['gif']['image_descriptor']) - 1] = $RasterData;
+//
+// $CurrentCodeSize = $RasterData['code_size'] + 1;
+// for ($i = 0; $i < pow(2, $RasterData['code_size']); $i++) {
+// $DefaultDataLookupTable[$i] = chr($i);
+// }
+// $DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 0] = ''; // Clear Code
+// $DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 1] = ''; // End Of Image Code
+//
+//
+// $NextValue = $this->GetLSBits($fd, $CurrentCodeSize);
+// echo 'Clear Code: '.$NextValue.'<BR>';
+//
+// $NextValue = $this->GetLSBits($fd, $CurrentCodeSize);
+// echo 'First Color: '.$NextValue.'<BR>';
+//
+// $Prefix = $NextValue;
+//$i = 0;
+// while ($i++ < 20) {
+// $NextValue = $this->GetLSBits($fd, $CurrentCodeSize);
+// echo $NextValue.'<BR>';
+// }
+//return true;
+// break;
+//
+// case '!':
+// // GIF Extension Block
+// $ExtensionBlockData = $NextBlockTest.fread($fd, 2);
+// $ExtensionBlock = array();
+// $ExtensionBlock['function_code'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 1, 1));
+// $ExtensionBlock['byte_length'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 2, 1));
+// $ExtensionBlock['data'] = fread($fd, $ExtensionBlock['byte_length']);
+// $ThisFileInfo['gif']['extension_blocks'][] = $ExtensionBlock;
+// break;
+//
+// case ';':
+// $ThisFileInfo['gif']['terminator_offset'] = ftell($fd) - 1;
+// // GIF Terminator
+// break;
+//
+// default:
+// break;
+//
+//
+// }
+// }
+
+ return true;
+ }
+
+
+ function GetLSBits($fd, $bits) {
+ static $bitbuffer = '';
+ while (strlen($bitbuffer) < $bits) {
+//echo 'Read another byte: '.ftell($fd).'<BR>';
+ $bitbuffer = str_pad(decbin(ord(fread($fd, 1))), 8, '0', STR_PAD_LEFT).$bitbuffer;
+ }
+
+ $value = bindec(substr($bitbuffer, 0 - $bits));
+ $bitbuffer = substr($bitbuffer, 0, 0 - $bits);
+
+ return $value;
+ }
+
+}
+
+
+?> \ No newline at end of file
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