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revision 742, Sat Dec 28 13:53:08 2002 UTC revision 912, Sun Mar 9 12:00:58 2003 UTC
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 /*****************************************************************************  
  *  
  *  XVID MPEG-4 VIDEO CODEC  
  *  - cbp function (zero block flags) -  
  *  
  *  Copyright (C) 2001-2002 - Edouard Gomez <ed.gomez@free.fr>  
  *  
  *  This file is part of XviD, a free MPEG-4 video encoder/decoder  
  *  
  *  XviD 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.  
  *  
  *  You should have received a copy of the GNU General Public License  
  *  along with this program; if not, write to the Free Software  
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA  
  *  
  *  Under section 8 of the GNU General Public License, the copyright  
  *  holders of XVID explicitly forbid distribution in the following  
  *  countries:  
  *  
  *    - Japan  
  *    - United States of America  
  *  
  *  Linking XviD statically or dynamically with other modules is making a  
  *  combined work based on XviD.  Thus, the terms and conditions of the  
  *  GNU General Public License cover the whole combination.  
  *  
  *  As a special exception, the copyright holders of XviD give you  
  *  permission to link XviD with independent modules that communicate with  
  *  XviD solely through the VFW1.1 and DShow interfaces, regardless of the  
  *  license terms of these independent modules, and to copy and distribute  
  *  the resulting combined work under terms of your choice, provided that  
  *  every copy of the combined work is accompanied by a complete copy of  
  *  the source code of XviD (the version of XviD used to produce the  
  *  combined work), being distributed under the terms of the GNU General  
  *  Public License plus this exception.  An independent module is a module  
  *  which is not derived from or based on XviD.  
  *  
  *  Note that people who make modified versions of XviD are not obligated  
  *  to grant this special exception for their modified versions; it is  
  *  their choice whether to do so.  The GNU General Public License gives  
  *  permission to release a modified version without this exception; this  
  *  exception also makes it possible to release a modified version which  
  *  carries forward this exception.  
  *  
  * $Id: cbp.c,v 1.9 2002-12-28 13:53:08 edgomez Exp $  
  *  
  ****************************************************************************/  
   
1  #include "../portab.h"  #include "../portab.h"
2  #include "cbp.h"  #include "cbp.h"
3    
 /*****************************************************************************  
  * Global function pointer  
  ****************************************************************************/  
   
4  cbpFuncPtr calc_cbp;  cbpFuncPtr calc_cbp;
5    
 /*****************************************************************************  
  * Functions  
  ****************************************************************************/  
   
6  /*  /*
7   * Returns a field of bits that indicates non zero ac blocks   * Returns a field of bits that indicates non zero ac blocks
8   * for this macro block   * for this macro block
9   */   */
10    
11    /* naive C */
12  uint32_t  uint32_t
13  calc_cbp_c(const int16_t codes[6 * 64])  calc_cbp_plain(const int16_t codes[6 * 64])
14  {  {
15          uint32_t i, j;          int i, j;
16          uint32_t cbp = 0;          uint32_t cbp = 0;
17    
18          for (i = 0; i < 6; i++) {          for (i = 0; i < 6; i++) {
19                  for (j = 1; j < 61; j += 4) {                  for (j=1; j<64;j++) {
20                          if (codes[i * 64 + j] | codes[i * 64 + j + 1] |                          if (codes[64*i+j]) {
                                 codes[i * 64 + j + 2] | codes[i * 64 + j + 3]) {  
21                                  cbp |= 1 << (5 - i);                                  cbp |= 1 << (5 - i);
22                                  break;                                  break;
23                          }                          }
24                  }                  }
25            }
26            return cbp;
27    }
28    
29                  if (codes[i * 64 + j] | codes[i * 64 + j + 1] | codes[i * 64 + j + 2])  /* optimized C */
30                          cbp |= 1 << (5 - i);  uint32_t
31    calc_cbp_c(const int16_t codes[6 * 64])
32    {
33            unsigned int i=6;
34            uint32_t cbp = 0;
35    
36    /* uses fixed relation: 4*codes = 1*codes64 */
37    /* if prototype is changed (e.g. from int16_t to something like int32) this routine
38       has to be changed! */
39    
40            do  {
41                    uint64_t *codes64 = (uint64_t*)codes;   /* the compiler doesn't really make this */
42                    uint32_t *codes32 = (uint32_t*)codes;   /* variables, just "addressing modes" */
43    
44                    cbp += cbp;
45            if (codes[1] || codes32[1]) {
46                            cbp++;
47          }          }
48            else if (codes64[1] | codes64[2] | codes64[3]) {
49                            cbp++;
50                    }
51            else if (codes64[4] | codes64[5] | codes64[6] | codes64[7]) {
52                            cbp++;
53                    }
54            else if (codes64[8] | codes64[9] | codes64[10] | codes64[11]) {
55                            cbp++;
56                    }
57            else if (codes64[12] | codes64[13] | codes64[14] | codes64[15]) {
58                            cbp++;
59                    }
60                    codes += 64;
61                    i--;
62        } while (i != 0);
63    
64          return cbp;          return cbp;
65    }
66    
67    
68    
69    
70    /* older code maybe better on some plattforms? */
71    #if (0==1)
72            for (i = 5; i >= 0; i--) {
73                    if (codes[1] | codes[2] | codes[3])
74                            cbp |= 1 << i;
75                    else {
76                            for (j = 4; j <= 56; j+=4)      /* [60],[61],[62],[63] are last */
77                                    if (codes[j] | codes[j+1] | codes[j+2] | codes[j+3]) {
78                                    cbp |= 1 << i;
79                                    break;
80                            }
81  }  }
82                    codes += 64;
83            }
84    
85            return cbp;
86    #endif
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