www/plugins-dist/medias/lib/getid3/module.graphic.gif.php

   1 <?php
   2 /////////////////////////////////////////////////////////////////
   3 /// getID3() by James Heinrich <info@getid3.org>               //
   4 //  available at http://getid3.sourceforge.net                 //
   5 //            or http://www.getid3.org                         //
   6 //          also https://github.com/JamesHeinrich/getID3       //
   7 /////////////////////////////////////////////////////////////////
   8 // See readme.txt for more details                             //
   9 /////////////////////////////////////////////////////////////////
  10 //                                                             //
  11 // module.graphic.gif.php                                      //
  12 // module for analyzing GIF Image files                        //
  13 // dependencies: NONE                                          //
  14 //                                                            ///
  15 /////////////////////////////////////////////////////////////////
  16
  17
  18 class getid3_gif extends getid3_handler
  19 {
  20
  21         public function Analyze() {
  22                 $info = &$this->getid3->info;
  23
  24                 $info['fileformat']                  = 'gif';
  25                 $info['video']['dataformat']         = 'gif';
  26                 $info['video']['lossless']           = true;
  27                 $info['video']['pixel_aspect_ratio'] = (float) 1;
  28
  29                 $this->fseek($info['avdataoffset']);
  30                 $GIFheader = $this->fread(13);
  31                 $offset = 0;
  32
  33                 $info['gif']['header']['raw']['identifier']            =                              substr($GIFheader, $offset, 3);
  34                 $offset += 3;
  35
  36                 $magic = 'GIF';
  37                 if ($info['gif']['header']['raw']['identifier'] != $magic) {
  38                         $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['gif']['header']['raw']['identifier']).'"');
  39                         unset($info['fileformat']);
  40                         unset($info['gif']);
  41                         return false;
  42                 }
  43
  44                 $info['gif']['header']['raw']['version']               =                              substr($GIFheader, $offset, 3);
  45                 $offset += 3;
  46                 $info['gif']['header']['raw']['width']                 = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2));
  47                 $offset += 2;
  48                 $info['gif']['header']['raw']['height']                = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 2));
  49                 $offset += 2;
  50                 $info['gif']['header']['raw']['flags']                 = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
  51                 $offset += 1;
  52                 $info['gif']['header']['raw']['bg_color_index']        = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
  53                 $offset += 1;
  54                 $info['gif']['header']['raw']['aspect_ratio']          = getid3_lib::LittleEndian2Int(substr($GIFheader, $offset, 1));
  55                 $offset += 1;
  56
  57                 $info['video']['resolution_x']                         = $info['gif']['header']['raw']['width'];
  58                 $info['video']['resolution_y']                         = $info['gif']['header']['raw']['height'];
  59                 $info['gif']['version']                                = $info['gif']['header']['raw']['version'];
  60                 $info['gif']['header']['flags']['global_color_table']  = (bool) ($info['gif']['header']['raw']['flags'] & 0x80);
  61                 if ($info['gif']['header']['raw']['flags'] & 0x80) {
  62                         // Number of bits per primary color available to the original image, minus 1
  63                         $info['gif']['header']['bits_per_pixel']  = 3 * ((($info['gif']['header']['raw']['flags'] & 0x70) >> 4) + 1);
  64                 } else {
  65                         $info['gif']['header']['bits_per_pixel']  = 0;
  66                 }
  67                 $info['gif']['header']['flags']['global_color_sorted'] = (bool) ($info['gif']['header']['raw']['flags'] & 0x40);
  68                 if ($info['gif']['header']['flags']['global_color_table']) {
  69                         // the number of bytes contained in the Global Color Table. To determine that
  70                         // actual size of the color table, raise 2 to [the value of the field + 1]
  71                         $info['gif']['header']['global_color_size'] = pow(2, ($info['gif']['header']['raw']['flags'] & 0x07) + 1);
  72                         $info['video']['bits_per_sample']           = ($info['gif']['header']['raw']['flags'] & 0x07) + 1;
  73                 } else {
  74                         $info['gif']['header']['global_color_size'] = 0;
  75                 }
  76                 if ($info['gif']['header']['raw']['aspect_ratio'] != 0) {
  77                         // Aspect Ratio = (Pixel Aspect Ratio + 15) / 64
  78                         $info['gif']['header']['aspect_ratio'] = ($info['gif']['header']['raw']['aspect_ratio'] + 15) / 64;
  79                 }
  80
  81 //              if ($info['gif']['header']['flags']['global_color_table']) {
  82 //                      $GIFcolorTable = $this->fread(3 * $info['gif']['header']['global_color_size']);
  83 //                      $offset = 0;
  84 //                      for ($i = 0; $i < $info['gif']['header']['global_color_size']; $i++) {
  85 //                              $red   = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
  86 //                              $green = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
  87 //                              $blue  = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
  88 //                              $info['gif']['global_color_table'][$i] = (($red << 16) | ($green << 8) | ($blue));
  89 //                      }
  90 //              }
  91 //
  92 //              // Image Descriptor
  93 //              while (!feof($this->getid3->fp)) {
  94 //                      $NextBlockTest = $this->fread(1);
  95 //                      switch ($NextBlockTest) {
  96 //
  97 //                              case ',': // ',' - Image separator character
  98 //
  99 //                                      $ImageDescriptorData = $NextBlockTest.$this->fread(9);
 100 //                                      $ImageDescriptor = array();
 101 //                                      $ImageDescriptor['image_left']   = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 1, 2));
 102 //                                      $ImageDescriptor['image_top']    = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 3, 2));
 103 //                                      $ImageDescriptor['image_width']  = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 5, 2));
 104 //                                      $ImageDescriptor['image_height'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 7, 2));
 105 //                                      $ImageDescriptor['flags_raw']    = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 9, 1));
 106 //                                      $ImageDescriptor['flags']['use_local_color_map'] = (bool) ($ImageDescriptor['flags_raw'] & 0x80);
 107 //                                      $ImageDescriptor['flags']['image_interlaced']    = (bool) ($ImageDescriptor['flags_raw'] & 0x40);
 108 //                                      $info['gif']['image_descriptor'][] = $ImageDescriptor;
 109 //
 110 //                                      if ($ImageDescriptor['flags']['use_local_color_map']) {
 111 //
 112 //                                              $this->warning('This version of getID3() cannot parse local color maps for GIFs');
 113 //                                              return true;
 114 //
 115 //                                      }
 116 //echo 'Start of raster data: '.$this->ftell().'<BR>';
 117 //                                      $RasterData = array();
 118 //                                      $RasterData['code_size']        = getid3_lib::LittleEndian2Int($this->fread(1));
 119 //                                      $RasterData['block_byte_count'] = getid3_lib::LittleEndian2Int($this->fread(1));
 120 //                                      $info['gif']['raster_data'][count($info['gif']['image_descriptor']) - 1] = $RasterData;
 121 //
 122 //                                      $CurrentCodeSize = $RasterData['code_size'] + 1;
 123 //                                      for ($i = 0; $i < pow(2, $RasterData['code_size']); $i++) {
 124 //                                              $DefaultDataLookupTable[$i] = chr($i);
 125 //                                      }
 126 //                                      $DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 0] = ''; // Clear Code
 127 //                                      $DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 1] = ''; // End Of Image Code
 128 //
 129 //
 130 //                                      $NextValue = $this->GetLSBits($CurrentCodeSize);
 131 //                                      echo 'Clear Code: '.$NextValue.'<BR>';
 132 //
 133 //                                      $NextValue = $this->GetLSBits($CurrentCodeSize);
 134 //                                      echo 'First Color: '.$NextValue.'<BR>';
 135 //
 136 //                                      $Prefix = $NextValue;
 137 //$i = 0;
 138 //                                      while ($i++ < 20) {
 139 //                                              $NextValue = $this->GetLSBits($CurrentCodeSize);
 140 //                                              echo $NextValue.'<BR>';
 141 //                                      }
 142 //return true;
 143 //                                      break;
 144 //
 145 //                              case '!':
 146 //                                      // GIF Extension Block
 147 //                                      $ExtensionBlockData = $NextBlockTest.$this->fread(2);
 148 //                                      $ExtensionBlock = array();
 149 //                                      $ExtensionBlock['function_code']  = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 1, 1));
 150 //                                      $ExtensionBlock['byte_length']    = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 2, 1));
 151 //                                      $ExtensionBlock['data']           = $this->fread($ExtensionBlock['byte_length']);
 152 //                                      $info['gif']['extension_blocks'][] = $ExtensionBlock;
 153 //                                      break;
 154 //
 155 //                              case ';':
 156 //                                      $info['gif']['terminator_offset'] = $this->ftell() - 1;
 157 //                                      // GIF Terminator
 158 //                                      break;
 159 //
 160 //                              default:
 161 //                                      break;
 162 //
 163 //
 164 //                      }
 165 //              }
 166
 167                 return true;
 168         }
 169
 170
 171         public function GetLSBits($bits) {
 172                 static $bitbuffer = '';
 173                 while (strlen($bitbuffer) < $bits) {
 174                         $bitbuffer = str_pad(decbin(ord($this->fread(1))), 8, '0', STR_PAD_LEFT).$bitbuffer;
 175                 }
 176                 $value = bindec(substr($bitbuffer, 0 - $bits));
 177                 $bitbuffer = substr($bitbuffer, 0, 0 - $bits);
 178
 179                 return $value;
 180         }
 181
 182 }