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revision 1.3, Thu Mar 28 20:57:24 2002 UTC revision 1.8, Sun Nov 17 00:57:57 2002 UTC
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1    /*****************************************************************************
2     *
3     *  XVID MPEG-4 VIDEO CODEC
4     *  - cbp function (zero block flags) -
5     *
6     *  Copyright (C) 2001-2002 - Edouard Gomez <ed.gomez@wanadoo.fr>
7     *
8     *  This file is part of XviD, a free MPEG-4 video encoder/decoder
9     *
10     *  XviD is free software; you can redistribute it and/or modify it
11     *  under the terms of the GNU General Public License as published by
12     *  the Free Software Foundation; either version 2 of the License, or
13     *  (at your option) any later version.
14     *
15     *  This program is distributed in the hope that it will be useful,
16     *  but WITHOUT ANY WARRANTY; without even the implied warranty of
17     *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18     *  GNU General Public License for more details.
19     *
20     *  You should have received a copy of the GNU General Public License
21     *  along with this program; if not, write to the Free Software
22     *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
23     *
24     *  Under section 8 of the GNU General Public License, the copyright
25     *  holders of XVID explicitly forbid distribution in the following
26     *  countries:
27     *
28     *    - Japan
29     *    - United States of America
30     *
31     *  Linking XviD statically or dynamically with other modules is making a
32     *  combined work based on XviD.  Thus, the terms and conditions of the
33     *  GNU General Public License cover the whole combination.
34     *
35     *  As a special exception, the copyright holders of XviD give you
36     *  permission to link XviD with independent modules that communicate with
37     *  XviD solely through the VFW1.1 and DShow interfaces, regardless of the
38     *  license terms of these independent modules, and to copy and distribute
39     *  the resulting combined work under terms of your choice, provided that
40     *  every copy of the combined work is accompanied by a complete copy of
41     *  the source code of XviD (the version of XviD used to produce the
42     *  combined work), being distributed under the terms of the GNU General
43     *  Public License plus this exception.  An independent module is a module
44     *  which is not derived from or based on XviD.
45     *
46     *  Note that people who make modified versions of XviD are not obligated
47     *  to grant this special exception for their modified versions; it is
48     *  their choice whether to do so.  The GNU General Public License gives
49     *  permission to release a modified version without this exception; this
50     *  exception also makes it possible to release a modified version which
51     *  carries forward this exception.
52     *
53     * $Id$
54     *
55     ****************************************************************************/
56    
57  #include "../portab.h"  #include "../portab.h"
58  #include "cbp.h"  #include "cbp.h"
59    
60    /*****************************************************************************
61     * Global function pointer
62     ****************************************************************************/
63    
64  cbpFuncPtr calc_cbp;  cbpFuncPtr calc_cbp;
65    
66    /*****************************************************************************
67     * Functions
68     ****************************************************************************/
69    
70  /*  /*
71   * Returns a field of bits that indicates non zero ac blocks   * Returns a field of bits that indicates non zero ac blocks
72   * for this macro block   * for this macro block
73   */   */
74  uint32_t calc_cbp_c(const int16_t codes[6*64])  uint32_t
75    calc_cbp_c(const int16_t codes[6 * 64])
76  {  {
77          uint32_t i, j;          uint32_t i, j;
78          uint32_t cbp = 0;          uint32_t cbp = 0;
79    
80          for (i = 0; i < 6*64; i+=64)          for (i = 0; i < 6; i++) {
81          {                  for (j = 1; j < 61; j += 4) {
82                  for (j = 1; j < 61; j+=4)                          if (codes[i * 64 + j] | codes[i * 64 + j + 1] |
83                  {                                  codes[i * 64 + j + 2] | codes[i * 64 + j + 3]) {
                         if (codes[i + j    ]|codes[i + j + 1]|  
                             codes[i + j + 2]|codes[i + j + 3])  
                         {  
84                                  cbp |= 1 << (5 - i);                                  cbp |= 1 << (5 - i);
85                                  break;                                  break;
86                          }                          }
87                  }                  }
88    
89                  if(codes[i + j]|codes[i + j +1]|codes[i + j + 2])                  if (codes[i * 64 + j] | codes[i * 64 + j + 1] | codes[i * 64 + j + 2])
90                          cbp |= 1 << (5 - i);                          cbp |= 1 << (5 - i);
91    
92          }          }
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