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File: includes/getid3/module.graphic.gif.php

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  Classes of Karl Holz  >  WaldScan  >  includes/getid3/module.graphic.gif.php  >  Download  
File: includes/getid3/module.graphic.gif.php
Role: Auxiliary script
Content type: text/plain
Description: getID3 dependency
Class: WaldScan
Scan directories for files with certain extensions
Author: By
Last change:
Date: 1 year ago
Size: 8,332 bytes
 

Contents

Class file image Download
<?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 extends getid3_handler
{

    function 
Analyze() {
        
$info = &$this->getid3->info;

        
$info['fileformat']                  = 'gif';
        
$info['video']['dataformat']         = 'gif';
        
$info['video']['lossless']           = true;
        
$info['video']['pixel_aspect_ratio'] = (float) 1;

        
fseek($this->getid3->fp$info['avdataoffset'], SEEK_SET);
        
$GIFheader fread($this->getid3->fp13);
        
$offset 0;

        
$info['gif']['header']['raw']['identifier']            =                              substr($GIFheader$offset3);
        
$offset += 3;

        
$magic 'GIF';
        if (
$info['gif']['header']['raw']['identifier'] != $magic) {
            
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['gif']['header']['raw']['identifier']).'"';
            unset(
$info['fileformat']);
            unset(
$info['gif']);
            return 
false;
        }

        
$info['gif']['header']['raw']['version']               =                              substr($GIFheader$offset3);
        
$offset += 3;
        
$info['gif']['header']['raw']['width']                 = getid3_lib::LittleEndian2Int(substr($GIFheader$offset2));
        
$offset += 2;
        
$info['gif']['header']['raw']['height']                = getid3_lib::LittleEndian2Int(substr($GIFheader$offset2));
        
$offset += 2;
        
$info['gif']['header']['raw']['flags']                 = getid3_lib::LittleEndian2Int(substr($GIFheader$offset1));
        
$offset += 1;
        
$info['gif']['header']['raw']['bg_color_index']        = getid3_lib::LittleEndian2Int(substr($GIFheader$offset1));
        
$offset += 1;
        
$info['gif']['header']['raw']['aspect_ratio']          = getid3_lib::LittleEndian2Int(substr($GIFheader$offset1));
        
$offset += 1;

        
$info['video']['resolution_x']                         = $info['gif']['header']['raw']['width'];
        
$info['video']['resolution_y']                         = $info['gif']['header']['raw']['height'];
        
$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
            
$info['gif']['header']['bits_per_pixel']  = * ((($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);
            
$info['video']['bits_per_sample']           = ($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;
        }

//        if ($info['gif']['header']['flags']['global_color_table']) {
//            $GIFcolorTable = fread($this->getid3->fp, 3 * $info['gif']['header']['global_color_size']);
//            $offset = 0;
//            for ($i = 0; $i < $info['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));
//                $info['gif']['global_color_table'][$i] = (($red << 16) | ($green << 8) | ($blue));
//            }
//        }
//
//        // Image Descriptor
//        while (!feof($this->getid3->fp)) {
//            $NextBlockTest = fread($this->getid3->fp, 1);
//            switch ($NextBlockTest) {
//
//                case ',': // ',' - Image separator character
//
//                    $ImageDescriptorData = $NextBlockTest.fread($this->getid3->fp, 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);
//                    $info['gif']['image_descriptor'][] = $ImageDescriptor;
//
//                    if ($ImageDescriptor['flags']['use_local_color_map']) {
//
//                        $info['warning'][] = 'This version of getID3() cannot parse local color maps for GIFs';
//                        return true;
//
//                    }
//echo 'Start of raster data: '.ftell($this->getid3->fp).'<BR>';
//                    $RasterData = array();
//                    $RasterData['code_size']        = getid3_lib::LittleEndian2Int(fread($this->getid3->fp, 1));
//                    $RasterData['block_byte_count'] = getid3_lib::LittleEndian2Int(fread($this->getid3->fp, 1));
//                    $info['gif']['raster_data'][count($info['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 = $this->GetLSBits($CurrentCodeSize);
//                    echo 'Clear Code: '.$NextValue.'<BR>';
//
//                    $NextValue = $this->GetLSBits($CurrentCodeSize);
//                    echo 'First Color: '.$NextValue.'<BR>';
//
//                    $Prefix = $NextValue;
//$i = 0;
//                    while ($i++ < 20) {
//                        $NextValue = $this->GetLSBits($CurrentCodeSize);
//                        echo $NextValue.'<BR>';
//                    }
//return true;
//                    break;
//
//                case '!':
//                    // GIF Extension Block
//                    $ExtensionBlockData = $NextBlockTest.fread($this->getid3->fp, 2);
//                    $ExtensionBlock = array();
//                    $ExtensionBlock['function_code']  = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 1, 1));
//                    $ExtensionBlock['byte_length']    = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 2, 1));
//                    $ExtensionBlock['data']           = fread($this->getid3->fp, $ExtensionBlock['byte_length']);
//                    $info['gif']['extension_blocks'][] = $ExtensionBlock;
//                    break;
//
//                case ';':
//                    $info['gif']['terminator_offset'] = ftell($this->getid3->fp) - 1;
//                    // GIF Terminator
//                    break;
//
//                default:
//                    break;
//
//
//            }
//        }

        
return true;
    }


    function 
GetLSBits($bits) {
        static 
$bitbuffer '';
        while (
strlen($bitbuffer) < $bits) {
            
$bitbuffer str_pad(decbin(ord(fread($this->getid3->fp1))), 8'0'STR_PAD_LEFT).$bitbuffer;
        }
        
$value bindec(substr($bitbuffer$bits));
        
$bitbuffer substr($bitbuffer0$bits);

        return 
$value;
    }

}


?>