// // 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).'
'; // $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.'
'; // // $NextValue = $this->GetLSBits($fd, $CurrentCodeSize); // echo 'First Color: '.$NextValue.'
'; // // $Prefix = $NextValue; //$i = 0; // while ($i++ < 20) { // $NextValue = $this->GetLSBits($fd, $CurrentCodeSize); // echo $NextValue.'
'; // } //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).'
'; $bitbuffer = str_pad(decbin(ord(fread($fd, 1))), 8, '0', STR_PAD_LEFT).$bitbuffer; } $value = bindec(substr($bitbuffer, 0 - $bits)); $bitbuffer = substr($bitbuffer, 0, 0 - $bits); return $value; } } ?>