[cvs] / xvidcore / src / quant / quant_mpeg4.c Repository:
ViewVC logotype

Diff of /xvidcore/src/quant/quant_mpeg4.c

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 1.8, Sun Dec 15 01:21:12 2002 UTC revision 1.9.2.2, Mon Jun 9 13:55:25 2003 UTC
# Line 1  Line 1 
1  /*****************************************************************************  /*****************************************************************************
2   *   *
3   *  XVID MPEG-4 VIDEO CODEC   *  XVID MPEG-4 VIDEO CODEC
4   *  - Mpeg4 quantization/dequantization functions -   *  - MPEG4 Quantization related header  -
5   *   *
6   *  Copyright(C) 2002 Peter Ross <pross@xvid.org>   *  Copyright(C) 2001-2003 Peter Ross <pross@xvid.org>
7   *   *
8   *  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
9   *   *  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  
10   *  the Free Software Foundation; either version 2 of the License, or   *  the Free Software Foundation; either version 2 of the License, or
11   *  (at your option) any later version.   *  (at your option) any later version.
12   *   *
# Line 21  Line 19 
19   *  along with this program; if not, write to the Free Software   *  along with this program; if not, write to the Free Software
20   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
21   *   *
  *  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.  
  *  
22   * $Id$   * $Id$
23   *   *
24   ****************************************************************************/   ****************************************************************************/
25    
26    #include "../global.h"
27  #include "quant_mpeg4.h"  #include "quant_mpeg4.h"
28  #include "quant_matrix.h"  #include "quant_matrix.h"
29    
30  /*****************************************************************************  /* function pointers */
  * Function pointers  
  ****************************************************************************/  
   
31  quant_intraFuncPtr quant4_intra;  quant_intraFuncPtr quant4_intra;
32  quant_intraFuncPtr dequant4_intra;  quant_intraFuncPtr dequant4_intra;
33  dequant_interFuncPtr dequant4_inter;  dequant_interFuncPtr dequant4_inter;
34  quant_interFuncPtr quant4_inter;  quant_interFuncPtr quant4_inter;
35    
36    
 /*****************************************************************************  
  * Local data  
  ****************************************************************************/  
   
 #define DIV_DIV(A,B)    ( (A) > 0 ? ((A)+((B)>>1))/(B) : ((A)-((B)>>1))/(B) )  
 #define SIGN(A)  ((A)>0?1:-1)  
37  #define VM18P    3  #define VM18P    3
38  #define VM18Q    4  #define VM18Q    4
39    
# Line 96  Line 57 
57          FIX(56), FIX(58), FIX(60), FIX(62)          FIX(56), FIX(58), FIX(60), FIX(62)
58  };  };
59    
60  /*****************************************************************************  /* quantize intra-block
61   * Functions   *
62   ****************************************************************************/   * const int32_t quantd = DIV_DIV(VM18P*quant, VM18Q);
63     * level = DIV_DIV(16 * data[i], default_intra_matrix[i]);
64  #if     0   * coeff[i] = (level + quantd) / quant2;
65  /*    quantize intra-block      */   */
   
     // const int32_t quantd = DIV_DIV(VM18P*quant, VM18Q);  
     //  
     // level = DIV_DIV(16 * data[i], default_intra_matrix[i]);  
     // coeff[i] = (level + quantd) / quant2;  
 #endif  
66    
67  void  void
68  quant4_intra_c(int16_t * coeff,  quant4_intra_c(int16_t * coeff,
# Line 122  Line 77 
77    
78          intra_matrix = get_intra_matrix();          intra_matrix = get_intra_matrix();
79    
80          coeff[0] = (int16_t)(DIV_DIV(data[0], (int32_t) dcscalar));          coeff[0] = DIV_DIV(data[0], (int32_t) dcscalar);
81    
82          for (i = 1; i < 64; i++) {          for (i = 1; i < 64; i++) {
83                  if (data[i] < 0) {                  if (data[i] < 0) {
# Line 136  Line 91 
91    
92                          level = ((level << 4) + (intra_matrix[i] >> 1)) / intra_matrix[i];                          level = ((level << 4) + (intra_matrix[i] >> 1)) / intra_matrix[i];
93                          level = ((level + quantd) * mult) >> 17;                          level = ((level + quantd) * mult) >> 17;
94                          coeff[i] = (int16_t)level;                          coeff[i] = level;
95                  } else {                  } else {
96                          coeff[i] = 0;                          coeff[i] = 0;
97                  }                  }
# Line 145  Line 100 
100    
101    
102    
103  /*    dequantize intra-block & clamp to [-2048,2047]    */  /*
104      /* data[i] = (coeff[i] * default_intra_matrix[i] * quant2) >> 4; */   * dequantize intra-block & clamp to [-2048,2047]
105     *
106     * data[i] = (coeff[i] * default_intra_matrix[i] * quant2) >> 4;
107     */
108    
109  void  void
110  dequant4_intra_c(int16_t * data,  dequant4_intra_c(int16_t * data,
# Line 160  Line 117 
117    
118          intra_matrix = get_intra_matrix();          intra_matrix = get_intra_matrix();
119    
120          data[0] = (int16_t)(coeff[0] * dcscalar);          data[0] = coeff[0] * dcscalar;
121          if (data[0] < -2048) {          if (data[0] < -2048) {
122                  data[0] = -2048;                  data[0] = -2048;
123          } else if (data[0] > 2047) {          } else if (data[0] > 2047) {
# Line 180  Line 137 
137                          uint32_t level = coeff[i];                          uint32_t level = coeff[i];
138    
139                          level = (level * intra_matrix[i] * quant) >> 3;                          level = (level * intra_matrix[i] * quant) >> 3;
140                          data[i] = (int16_t)(level <= 2047 ? level : 2047);                          data[i] = (level <= 2047 ? level : 2047);
141                  }                  }
142          }          }
143  }  }
144    
145    
146    
147  #if     0  /* quantize inter-block
148  /*    quantize inter-block      */   *
149     * level = DIV_DIV(16 * data[i], default_intra_matrix[i]);
150      // level = DIV_DIV(16 * data[i], default_intra_matrix[i]);   * coeff[i] = (level + quantd) / quant2;
151      // coeff[i] = (level + quantd) / quant2;   * sum += abs(level);
152      // sum += abs(level);  */
 #endif  
153    
154  uint32_t  uint32_t
155  quant4_inter_c(int16_t * coeff,  quant4_inter_c(int16_t * coeff,
# Line 221  Line 177 
177                          level = ((level << 4) + (inter_matrix[i] >> 1)) / inter_matrix[i];                          level = ((level << 4) + (inter_matrix[i] >> 1)) / inter_matrix[i];
178                          level = (level * mult) >> 17;                          level = (level * mult) >> 17;
179                          sum += level;                          sum += level;
180                          coeff[i] = (int16_t)level;                          coeff[i] = level;
181                  } else {                  } else {
182                          coeff[i] = 0;                          coeff[i] = 0;
183                  }                  }
# Line 259  Line 215 
215                          uint32_t level = coeff[i];                          uint32_t level = coeff[i];
216    
217                          level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4;                          level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4;
218                          data[i] = (int16_t)(level <= 2047 ? level : 2047);                          data[i] = (level <= 2047 ? level : 2047);
219                  }                  }
220    
221                  sum ^= data[i];                  sum ^= data[i];
Legend:
Removed from v.1.8  
changed lines
  Added in v.1.9.2.2
No admin address has been configured
 ViewVC Help
Powered by ViewVC 1.0.4