Mercurial > judyates

     1 <?php

     2 // +----------------------------------------------------------------------+

     3 // | PHP version 5                                                        |

     4 // +----------------------------------------------------------------------+

     5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen                 |

     6 // +----------------------------------------------------------------------+

     7 // | This source file is subject to version 2 of the GPL license,         |

     8 // | that is bundled with this package in the file license.txt and is     |

     9 // | available through the world-wide-web at the following url:           |

    10 // | http://www.gnu.org/copyleft/gpl.html                                 |

    11 // +----------------------------------------------------------------------+

    12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org    |

    13 // +----------------------------------------------------------------------+

    14 // | Authors: James Heinrich <infoØgetid3*org>                            |

    15 // |          Allan Hansen <ahØartemis*dk>                                |

    16 // +----------------------------------------------------------------------+

    17 // | module.graphic.bmp.php                                               |

    18 // | Module for analyzing BMP graphic files.                              |

    19 // | dependencies: NONE                                                   |

    20 // +----------------------------------------------------------------------+

    21 //

    22 // $Id: module.graphic.bmp.php,v 1.4 2006/11/02 10:48:02 ah Exp $

    23 

    24         

    25         

    26 class getid3_bmp extends getid3_handler

    27 {

    28 

    29 

    30     public function Analyze() {

    31 

    32         $getid3 = $this->getid3;

    33 

    34         // BITMAPFILEHEADER [14 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_62uq.asp

    35         // all versions

    36         // WORD    bfType;

    37         // DWORD   bfSize;

    38         // WORD    bfReserved1;

    39         // WORD    bfReserved2;

    40         // DWORD   bfOffBits;

    41         

    42         // shortcuts

    43         $getid3->info['bmp']['header']['raw'] = array ();

    44         $info_bmp            = &$getid3->info['bmp'];

    45         $info_bmp_header     = &$info_bmp['header'];

    46         $info_bmp_header_raw = &$info_bmp_header['raw'];

    47 

    48         fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);

    49         $bmp_header = fread($getid3->fp, 14 + 40);

    50 

    51         // Magic bytes

    52         $info_bmp_header_raw['identifier'] = 'BM';

    53         

    54         getid3_lib::ReadSequence('LittleEndian2Int', $info_bmp_header_raw, $bmp_header, 2,

    55             array (

    56                 'filesize'    => 4,

    57                 'reserved1'   => 2,

    58                 'reserved2'   => 2,

    59                 'data_offset' => 4,

    60                 'header_size' => 4

    61             )

    62         );

    63         

    64         // Check if the hardcoded-to-1 "planes" is at offset 22 or 26

    65         $planes22 = getid3_lib::LittleEndian2Int(substr($bmp_header, 22, 2));

    66         $planes26 = getid3_lib::LittleEndian2Int(substr($bmp_header, 26, 2));

    67         if (($planes22 == 1) && ($planes26 != 1)) {

    68             $info_bmp['type_os']      = 'OS/2';

    69             $info_bmp['type_version'] = 1;

    70         } 

    71         elseif (($planes26 == 1) && ($planes22 != 1)) {

    72             $info_bmp['type_os']      = 'Windows';

    73             $info_bmp['type_version'] = 1;

    74         } 

    75         elseif ($info_bmp_header_raw['header_size'] == 12) {

    76             $info_bmp['type_os']      = 'OS/2';

    77             $info_bmp['type_version'] = 1;

    78         } 

    79         elseif ($info_bmp_header_raw['header_size'] == 40) {

    80             $info_bmp['type_os']      = 'Windows';

    81             $info_bmp['type_version'] = 1;

    82         } 

    83         elseif ($info_bmp_header_raw['header_size'] == 84) {

    84             $info_bmp['type_os']      = 'Windows';

    85             $info_bmp['type_version'] = 4;

    86         } 

    87         elseif ($info_bmp_header_raw['header_size'] == 100) {

    88             $info_bmp['type_os']      = 'Windows';

    89             $info_bmp['type_version'] = 5;

    90         } 

    91         else {

    92             throw new getid3_exception('Unknown BMP subtype (or not a BMP file)');

    93         }

    94 

    95         $getid3->info['fileformat']                  = 'bmp';

    96         $getid3->info['video']['dataformat']         = 'bmp';

    97         $getid3->info['video']['lossless']           = true;

    98         $getid3->info['video']['pixel_aspect_ratio'] = (float)1;

    99 

   100         if ($info_bmp['type_os'] == 'OS/2') {

   101 

   102             // OS/2-format BMP

   103             // http://netghost.narod.ru/gff/graphics/summary/os2bmp.htm

   104 

   105             // DWORD  Size;             /* Size of this structure in bytes */

   106             // DWORD  Width;            /* Bitmap width in pixels */

   107             // DWORD  Height;           /* Bitmap height in pixel */

   108             // WORD   NumPlanes;        /* Number of bit planes (color depth) */

   109             // WORD   BitsPerPixel;     /* Number of bits per pixel per plane */

   110             

   111             getid3_lib::ReadSequence('LittleEndian2Int', $info_bmp_header_raw, $bmp_header, 18,

   112                 array (

   113                     'width'          => 2,

   114                     'height'         => 2,

   115                     'planes'         => 2,

   116                     'bits_per_pixel' => 2

   117                 )

   118             );

   119             

   120             $getid3->info['video']['resolution_x']    = $info_bmp_header_raw['width'];

   121             $getid3->info['video']['resolution_y']    = $info_bmp_header_raw['height'];

   122             $getid3->info['video']['codec']           = 'BI_RGB '.$info_bmp_header_raw['bits_per_pixel'].'-bit';

   123             $getid3->info['video']['bits_per_sample'] = $info_bmp_header_raw['bits_per_pixel'];

   124             

   125             if ($info_bmp['type_version'] >= 2) {

   126                 // DWORD  Compression;      /* Bitmap compression scheme */

   127                 // DWORD  ImageDataSize;    /* Size of bitmap data in bytes */

   128                 // DWORD  XResolution;      /* X resolution of display device */

   129                 // DWORD  YResolution;      /* Y resolution of display device */

   130                 // DWORD  ColorsUsed;       /* Number of color table indices used */

   131                 // DWORD  ColorsImportant;  /* Number of important color indices */

   132                 // WORD   Units;            /* Type of units used to measure resolution */

   133                 // WORD   Reserved;         /* Pad structure to 4-byte boundary */

   134                 // WORD   Recording;        /* Recording algorithm */

   135                 // WORD   Rendering;        /* Halftoning algorithm used */

   136                 // DWORD  Size1;            /* Reserved for halftoning algorithm use */

   137                 // DWORD  Size2;            /* Reserved for halftoning algorithm use */

   138                 // DWORD  ColorEncoding;    /* Color model used in bitmap */

   139                 // DWORD  Identifier;       /* Reserved for application use */

   140                 

   141                 getid3_lib::ReadSequence('LittleEndian2Int', $info_bmp_header_raw, $bmp_header, 26,

   142                     array (

   143                         'compression'      => 4,

   144                         'bmp_data_size'    => 4,

   145                         'resolution_h'     => 4,

   146                         'resolution_v'     => 4,

   147                         'colors_used'      => 4,

   148                         'colors_important' => 4,

   149                         'resolution_units' => 2,

   150                         'reserved1'        => 2,

   151                         'recording'        => 2,

   152                         'rendering'        => 2,

   153                         'size1'            => 4,

   154                         'size2'            => 4,

   155                         'color_encoding'   => 4,

   156                         'identifier'       => 4

   157                     )

   158                 );

   159 

   160                 $info_bmp_header['compression'] = getid3_bmp::BMPcompressionOS2Lookup($info_bmp_header_raw['compression']);

   161                 $getid3->info['video']['codec'] = $info_bmp_header['compression'].' '.$info_bmp_header_raw['bits_per_pixel'].'-bit';

   162             }

   163             

   164             return true;

   165         } 

   166     

   167         

   168         if ($info_bmp['type_os'] == 'Windows') {

   169 

   170             // Windows-format BMP

   171 

   172             // BITMAPINFOHEADER - [40 bytes] http://msdn.microsoft.com/library/en-us/gdi/bitmaps_1rw2.asp

   173             // all versions

   174             // DWORD  biSize;

   175             // LONG   biWidth;

   176             // LONG   biHeight;

   177             // WORD   biPlanes;

   178             // WORD   biBitCount;

   179             // DWORD  biCompression;

   180             // DWORD  biSizeImage;

   181             // LONG   biXPelsPerMeter;

   182             // LONG   biYPelsPerMeter;

   183             // DWORD  biClrUsed;

   184             // DWORD  biClrImportant;

   185 

   186             getid3_lib::ReadSequence('LittleEndian2Int', $info_bmp_header_raw, $bmp_header, 18,

   187                 array (

   188                     'width'            => -4,        //signed

   189                     'height'           => -4,        //signed

   190                     'planes'           => 2,

   191                     'bits_per_pixel'   => 2,

   192                     'compression'      => 4,

   193                     'bmp_data_size'    => 4,

   194                     'resolution_h'     => -4,        //signed

   195                     'resolution_v'     => -4,        //signed

   196                     'colors_used'      => 4,

   197                     'colors_important' => 4

   198                 )

   199             );

   200             foreach (array ('width', 'height', 'resolution_h', 'resolution_v') as $key) {

   201                 $info_bmp_header_raw[$key] = getid3_lib::LittleEndian2Int($info_bmp_header_raw[$key], true);

   202             }

   203             

   204             $info_bmp_header['compression']           = getid3_bmp::BMPcompressionWindowsLookup($info_bmp_header_raw['compression']);

   205             $getid3->info['video']['resolution_x']    = $info_bmp_header_raw['width'];

   206             $getid3->info['video']['resolution_y']    = $info_bmp_header_raw['height'];

   207             $getid3->info['video']['codec']           = $info_bmp_header['compression'].' '.$info_bmp_header_raw['bits_per_pixel'].'-bit';

   208             $getid3->info['video']['bits_per_sample'] = $info_bmp_header_raw['bits_per_pixel'];

   209 

   210             // should only be v4+, but BMPs with type_version==1 and BI_BITFIELDS compression have been seen

   211             if (($info_bmp['type_version'] >= 4) || ($info_bmp_header_raw['compression'] == 3)) {

   212   	            

   213                 

   214                 $bmp_header .= fread($getid3->fp, 44);

   215 

   216                 // BITMAPV4HEADER - [44 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_2k1e.asp

   217                 // Win95+, WinNT4.0+

   218                 // DWORD        bV4RedMask;

   219                 // DWORD        bV4GreenMask;

   220                 // DWORD        bV4BlueMask;

   221                 // DWORD        bV4AlphaMask;

   222                 // DWORD        bV4CSType;

   223                 // CIEXYZTRIPLE bV4Endpoints;

   224                 // DWORD        bV4GammaRed;

   225                 // DWORD        bV4GammaGreen;

   226                 // DWORD        bV4GammaBlue;

   227                 

   228                 getid3_lib::ReadSequence('LittleEndian2Int', $info_bmp_header_raw, $bmp_header, 54,

   229                     array (

   230                         'red_mask'     => 4,

   231                         'green_mask'   => 4,

   232                         'blue_mask'    => 4,

   233                         'alpha_mask'   => 4,

   234                         'cs_type'      => 4,

   235                         'ciexyz_red'   => -4,       //string

   236                         'ciexyz_green' => -4,       //string

   237                         'ciexyz_blue'  => -4,       //string

   238                         'gamma_red'    => 4,

   239                         'gamma_green'  => 4,

   240                         'gamma_blue'   => 4

   241                     )

   242                 );

   243                 

   244                 $info_bmp_header['ciexyz_red']   = getid3_bmp::FixedPoint2_30(strrev($info_bmp_header_raw['ciexyz_red']));

   245                 $info_bmp_header['ciexyz_green'] = getid3_bmp::FixedPoint2_30(strrev($info_bmp_header_raw['ciexyz_green']));

   246                 $info_bmp_header['ciexyz_blue']  = getid3_bmp::FixedPoint2_30(strrev($info_bmp_header_raw['ciexyz_blue']));

   247             

   248 

   249                 if ($info_bmp['type_version'] >= 5) {

   250                     $bmp_header .= fread($getid3->fp, 16);

   251     

   252                     // BITMAPV5HEADER - [16 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_7c36.asp

   253                     // Win98+, Win2000+

   254                     // DWORD        bV5Intent;

   255                     // DWORD        bV5ProfileData;

   256                     // DWORD        bV5ProfileSize;

   257                     // DWORD        bV5Reserved;

   258                     

   259                     getid3_lib::ReadSequence('LittleEndian2Int', $info_bmp_header_raw, $bmp_header, 98,

   260                         array (

   261                             'intent'              => 4,

   262                             'profile_data_offset' => 4,

   263                             'profile_data_size'   => 4,

   264                             'reserved3'           => 4

   265                         )

   266                     );

   267                     

   268                 }

   269             }

   270             

   271             return true;

   272         }

   273 

   274 

   275         throw new getid3_exception('Unknown BMP format in header.');

   276         

   277     }

   278 

   279 

   280 

   281     public static function BMPcompressionWindowsLookup($compression_id) {

   282 

   283         static $lookup = array (

   284             0 => 'BI_RGB',

   285             1 => 'BI_RLE8',

   286             2 => 'BI_RLE4',

   287             3 => 'BI_BITFIELDS',

   288             4 => 'BI_JPEG',

   289             5 => 'BI_PNG'

   290         );

   291         return (isset($lookup[$compression_id]) ? $lookup[$compression_id] : 'invalid');

   292     }

   293 

   294 

   295 

   296     public static function BMPcompressionOS2Lookup($compression_id) {

   297         

   298         static $lookup = array (

   299             0 => 'BI_RGB',

   300             1 => 'BI_RLE8',

   301             2 => 'BI_RLE4',

   302             3 => 'Huffman 1D',

   303             4 => 'BI_RLE24',

   304         );

   305         return (isset($lookup[$compression_id]) ? $lookup[$compression_id] : 'invalid');

   306     }

   307     

   308     

   309     public static function FixedPoint2_30($raw_data) {

   310         

   311         $binary_string = getid3_lib::BigEndian2Bin($raw_data);

   312         return bindec(substr($binary_string, 0, 2)) + (float)(bindec(substr($binary_string, 2, 30)) / 1073741824);        // pow(2, 30) = 1073741824

   313     }

   314 

   315 

   316 }

   317 

   318 

   319 ?>
author	Robert McIntyre <rlm@mit.edu>
date	Tue, 22 Jun 2010 13:41:04 -0400
parents	3f6b44aa6b35
children