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revision 461, Tue Sep 10 20:38:24 2002 UTC revision 851, Sat Feb 15 15:22:19 2003 UTC
# Line 1  Line 1 
1  /*****************************************************************************  /* idct.c, inverse fast discrete cosine transform                           */
2   *  
3   *  XVID MPEG-4 VIDEO CODEC  /* Copyright (C) 1996, MPEG Software Simulation Group. All Rights Reserved. */
4   *  - inverse fast disrete cosine transformation - integer C version  
5   *  /*
6   *  These routines are from Independent JPEG Group's free JPEG software   * Disclaimer of Warranty
  *  Copyright (C) 1991-1998, Thomas G. Lane (see the file README.IJG)  
  *  
  *  This program is an implementation of a part of one or more MPEG-4  
  *  Video tools as specified in ISO/IEC 14496-2 standard.  Those intending  
  *  to use this software module in hardware or software products are  
  *  advised that its use may infringe existing patents or copyrights, and  
  *  any such use would be at such party's own risk.  The original  
  *  developer of this software module and his/her company, and subsequent  
  *  editors and their companies, will have no liability for use of this  
  *  software or modifications or derivatives thereof.  
  *  
  *  This program is free software; you can redistribute it and/or modify  
  *  it under the terms of the GNU General Public License as published by  
  *  the Free Software Foundation; either version 2 of the License, or  
  *  (at your option) any later version.  
  *  
  *  This program is distributed in the hope that it will be useful,  
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of  
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the  
  *  GNU General Public License for more details.  
7   *   *
8   *  You should have received a copy of the GNU General Public License   * These software programs are available to the user without any license fee or
9   *  along with this program; if not, write to the Free Software   * royalty on an "as is" basis.  The MPEG Software Simulation Group disclaims
10   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA   * any and all warranties, whether express, implied, or statuary, including any
11     * implied warranties or merchantability or of fitness for a particular
12     * purpose.  In no event shall the copyright-holder be liable for any
13     * incidental, punitive, or consequential damages of any kind whatsoever
14     * arising from the use of these programs.
15     *
16     * This disclaimer of warranty extends to the user of these programs and user's
17     * customers, employees, agents, transferees, successors, and assigns.
18     *
19     * The MPEG Software Simulation Group does not represent or warrant that the
20     * programs furnished hereunder are free of infringement of any third-party
21     * patents.
22     *
23     * Commercial implementations of MPEG-1 and MPEG-2 video, including shareware,
24     * are subject to royalty fees to patent holders.  Many of these patents are
25     * general enough such that they are unavoidable regardless of implementation
26     * design.
27     *
28     * MPEG2AVI
29     * --------
30     * v0.16B33 renamed the initialization function to init_idct_int32()
31     * v0.16B32 removed the unused idct_row() and idct_col() functions
32     * v0.16B3  changed var declarations to static, to enforce data align
33     * v0.16B22  idct_FAST() renamed to idct_int32()
34     *        also merged idct_FAST() into a single function, to help VC++
35     *        optimize it.
36   *   *
37   *************************************************************************/   * v0.14  changed int to long, to avoid confusion when compiling on x86
38     *        platform ( in VC++ "int" -> 32bits )
39     */
40    
41  /**********************************************************/  /**********************************************************/
42  /* inverse two dimensional DCT, Chen-Wang algorithm       */  /* inverse two dimensional DCT, Chen-Wang algorithm       */
# Line 45  Line 52 
52  /* this code assumes >> to be a two's-complement arithmetic */  /* this code assumes >> to be a two's-complement arithmetic */
53  /* right shift: (-2)>>1 == -1 , (-3)>>1 == -2               */  /* right shift: (-2)>>1 == -1 , (-3)>>1 == -2               */
54    
55    //#include <windows.h>
56  #include "idct.h"  #include "idct.h"
57    
58  #define W1 2841                                 /* 2048*sqrt(2)*cos(1*pi/16) */  #define W1 2841                                 /* 2048*sqrt(2)*cos(1*pi/16) */
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