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revision 195, Wed Jun 12 20:38:41 2002 UTC revision 461, Tue Sep 10 20:38:24 2002 UTC
# Line 1  Line 1 
1  /* idct.c, inverse fast discrete cosine transform                           */  /*****************************************************************************
   
 /* Copyright (C) 1996, MPEG Software Simulation Group. All Rights Reserved. */  
   
 /*  
  * Disclaimer of Warranty  
2   *   *
3   * These software programs are available to the user without any license fee or   *  XVID MPEG-4 VIDEO CODEC
4   * royalty on an "as is" basis.  The MPEG Software Simulation Group disclaims   *  - inverse fast disrete cosine transformation - integer C version
  * any and all warranties, whether express, implied, or statuary, including any  
  * implied warranties or merchantability or of fitness for a particular  
  * purpose.  In no event shall the copyright-holder be liable for any  
  * incidental, punitive, or consequential damages of any kind whatsoever  
  * arising from the use of these programs.  
  *  
  * This disclaimer of warranty extends to the user of these programs and user's  
  * customers, employees, agents, transferees, successors, and assigns.  
  *  
  * The MPEG Software Simulation Group does not represent or warrant that the  
  * programs furnished hereunder are free of infringement of any third-party  
  * patents.  
  *  
  * Commercial implementations of MPEG-1 and MPEG-2 video, including shareware,  
  * are subject to royalty fees to patent holders.  Many of these patents are  
  * general enough such that they are unavoidable regardless of implementation  
  * design.  
  *  
  * MPEG2AVI  
  * --------  
  * v0.16B33 renamed the initialization function to init_idct_int32()  
  * v0.16B32 removed the unused idct_row() and idct_col() functions  
  * v0.16B3  changed var declarations to static, to enforce data align  
  * v0.16B22  idct_FAST() renamed to idct_int32()  
  *        also merged idct_FAST() into a single function, to help VC++  
  *        optimize it.  
5   *   *
6   * v0.14  changed int to long, to avoid confusion when compiling on x86   *  These routines are from Independent JPEG Group's free JPEG software
7   *        platform ( in VC++ "int" -> 32bits )   *  Copyright (C) 1991-1998, Thomas G. Lane (see the file README.IJG)
8   */   *
9     *  This program is an implementation of a part of one or more MPEG-4
10     *  Video tools as specified in ISO/IEC 14496-2 standard.  Those intending
11     *  to use this software module in hardware or software products are
12     *  advised that its use may infringe existing patents or copyrights, and
13     *  any such use would be at such party's own risk.  The original
14     *  developer of this software module and his/her company, and subsequent
15     *  editors and their companies, will have no liability for use of this
16     *  software or modifications or derivatives thereof.
17     *
18     *  This program is free software; you can redistribute it and/or modify
19     *  it under the terms of the GNU General Public License as published by
20     *  the Free Software Foundation; either version 2 of the License, or
21     *  (at your option) any later version.
22     *
23     *  This program is distributed in the hope that it will be useful,
24     *  but WITHOUT ANY WARRANTY; without even the implied warranty of
25     *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
26     *  GNU General Public License for more details.
27     *
28     *  You should have received a copy of the GNU General Public License
29     *  along with this program; if not, write to the Free Software
30     *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
31     *
32     *************************************************************************/
33    
34  /**********************************************************/  /**********************************************************/
35  /* inverse two dimensional DCT, Chen-Wang algorithm       */  /* inverse two dimensional DCT, Chen-Wang algorithm       */
# Line 52  Line 45 
45  /* this code assumes >> to be a two's-complement arithmetic */  /* this code assumes >> to be a two's-complement arithmetic */
46  /* right shift: (-2)>>1 == -1 , (-3)>>1 == -2               */  /* right shift: (-2)>>1 == -1 , (-3)>>1 == -2               */
47    
 //#include <windows.h>  
48  #include "idct.h"  #include "idct.h"
49    
50  #define W1 2841                                 /* 2048*sqrt(2)*cos(1*pi/16) */  #define W1 2841                                 /* 2048*sqrt(2)*cos(1*pi/16) */

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