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revision 1.6.2.1, Mon Jun 9 01:19:37 2003 UTC revision 1.7.2.1, Sun Aug 22 13:15:15 2004 UTC
# Line 1  Line 1 
1  /* idct.c, inverse fast discrete cosine transform                           */  /*****************************************************************************
2     *
3     *  XVID MPEG-4 VIDEO CODEC
4     *  - Inverse DCT  -
5     *
6     *  These routines are from Independent JPEG Group's free JPEG software
7     *  Copyright (C) 1991-1998, Thomas G. Lane (see the file README.IJG)
8     *
9     *  This program is free software ; you can redistribute it and/or modify
10     *  it under the terms of the GNU General Public License as published by
11     *  the Free Software Foundation ; either version 2 of the License, or
12     *  (at your option) any later version.
13     *
14     *  This program is distributed in the hope that it will be useful,
15     *  but WITHOUT ANY WARRANTY ; without even the implied warranty of
16     *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17     *  GNU General Public License for more details.
18     *
19     *  You should have received a copy of the GNU General Public License
20     *  along with this program ; if not, write to the Free Software
21     *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
22     *
23     * $Id$
24     *
25     ****************************************************************************/
26    
27  /* Copyright (C) 1996, MPEG Software Simulation Group. All Rights Reserved. */  /* Copyright (C) 1996, MPEG Software Simulation Group. All Rights Reserved. */
28    
# Line 61  Line 85 
85  #define W6 1108                                 /* 2048*sqrt(2)*cos(6*pi/16) */  #define W6 1108                                 /* 2048*sqrt(2)*cos(6*pi/16) */
86  #define W7 565                                  /* 2048*sqrt(2)*cos(7*pi/16) */  #define W7 565                                  /* 2048*sqrt(2)*cos(7*pi/16) */
87    
88  /* private data */  /* private data
89     * Initialized by idct_int32_init so it's mostly RO data,
90     * doesn't hurt thread safety */
91  static short iclip[1024];               /* clipping table */  static short iclip[1024];               /* clipping table */
92  static short *iclp;  static short *iclp;
93    
# Line 223  Line 249 
249                  idctcol(block+i);                  idctcol(block+i);
250  #endif  #endif
251    
252          static short *blk;          short *blk;
253          static long i;          long i;
254          static long X0, X1, X2, X3, X4, X5, X6, X7, X8;          long X0, X1, X2, X3, X4, X5, X6, X7, X8;
255    
256    
257          for (i = 0; i < 8; i++)         /* idct rows */          for (i = 0; i < 8; i++)         /* idct rows */
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