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revision 1.9, Sat Dec 28 13:53:08 2002 UTC revision 1.10.2.3, Wed Oct 1 23:23:01 2003 UTC
# Line 1  Line 1 
1  /*****************************************************************************  /*****************************************************************************
2   *   *
3   *  XVID MPEG-4 VIDEO CODEC   *  XVID MPEG-4 VIDEO CODEC
4   *  - cbp function (zero block flags) -   *  - CBP related function  -
5   *   *
6   *  Copyright (C) 2001-2002 - Edouard Gomez <ed.gomez@free.fr>   *  Copyright(C) 2002-2003 Edouard Gomez <ed.gomez@free.fr>
7     *               2003      Christoph Lampert <gruel@web.de>
8   *   *
9   *  This file is part of XviD, a free MPEG-4 video encoder/decoder   *  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
  *  XviD is free software; you can redistribute it and/or modify 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   *  the Free Software Foundation; either version 2 of the License, or
12   *  (at your option) any later version.   *  (at your option) any later version.
13   *   *
# Line 21  Line 20 
20   *  along with this program; if not, write to the Free Software   *  along with this program; if not, write to the Free Software
21   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
22   *   *
  *  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.  
  *  
23   * $Id$   * $Id$
24   *   *
25   ****************************************************************************/   ****************************************************************************/
# Line 57  Line 27 
27  #include "../portab.h"  #include "../portab.h"
28  #include "cbp.h"  #include "cbp.h"
29    
 /*****************************************************************************  
  * Global function pointer  
  ****************************************************************************/  
   
30  cbpFuncPtr calc_cbp;  cbpFuncPtr calc_cbp;
31    
 /*****************************************************************************  
  * Functions  
  ****************************************************************************/  
   
32  /*  /*
33   * Returns a field of bits that indicates non zero ac blocks   * Returns a field of bits that indicates non zero ac blocks
34   * for this macro block   * for this macro block
35   */   */
36    
37    /* naive C */
38  uint32_t  uint32_t
39  calc_cbp_c(const int16_t codes[6 * 64])  calc_cbp_plain(const int16_t codes[6 * 64])
40  {  {
41          uint32_t i, j;          int i, j;
42          uint32_t cbp = 0;          uint32_t cbp = 0;
43    
44          for (i = 0; i < 6; i++) {          for (i = 0; i < 6; i++) {
45                  for (j = 1; j < 61; j += 4) {                  for (j=1; j<64;j++) {
46                          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]) {  
47                                  cbp |= 1 << (5 - i);                                  cbp |= 1 << (5 - i);
48                                  break;                                  break;
49                          }                          }
50                  }                  }
51            }
52            return cbp;
53    }
54    
55                  if (codes[i * 64 + j] | codes[i * 64 + j + 1] | codes[i * 64 + j + 2])  /* optimized C */
56                          cbp |= 1 << (5 - i);  uint32_t
57    calc_cbp_c(const int16_t codes[6 * 64])
58    {
59            unsigned int i=6;
60            uint32_t cbp = 0;
61    
62    /* uses fixed relation: 4*codes = 1*codes64 */
63    /* if prototype is changed (e.g. from int16_t to something like int32) this routine
64       has to be changed! */
65    
66            do  {
67                    uint64_t *codes64 = (uint64_t*)codes;   /* the compiler doesn't really make this */
68                    uint32_t *codes32 = (uint32_t*)codes;   /* variables, just "addressing modes" */
69    
70                    cbp += cbp;
71            if (codes[1] || codes32[1]) {
72                            cbp++;
73                    }
74            else if (codes64[1] | codes64[2] | codes64[3]) {
75                            cbp++;
76                    }
77            else if (codes64[4] | codes64[5] | codes64[6] | codes64[7]) {
78                            cbp++;
79          }          }
80            else if (codes64[8] | codes64[9] | codes64[10] | codes64[11]) {
81                            cbp++;
82                    }
83            else if (codes64[12] | codes64[13] | codes64[14] | codes64[15]) {
84                            cbp++;
85                    }
86                    codes += 64;
87                    i--;
88        } while (i != 0);
89    
90          return cbp;          return cbp;
91    }
92    
93    
94    
95    
96    /* older code maybe better on some plattforms? */
97    #if 0
98            for (i = 5; i >= 0; i--) {
99                    if (codes[1] | codes[2] | codes[3])
100                            cbp |= 1 << i;
101                    else {
102                            for (j = 4; j <= 56; j+=4)      /* [60],[61],[62],[63] are last */
103                                    if (codes[j] | codes[j+1] | codes[j+2] | codes[j+3]) {
104                                    cbp |= 1 << i;
105                                    break;
106                            }
107  }  }
108                    codes += 64;
109            }
110    
111            return cbp;
112    #endif
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