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trunk/xvidcore/src/quant/quant_mpeg4.c revision 653, Sun Nov 17 00:41:20 2002 UTC branches/dev-api-4/xvidcore/src/quant/quant_mpeg4.c revision 1054, Mon Jun 9 13:55:56 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   *   *
22   *  Under section 8 of the GNU General Public License, the copyright   * $Id: quant_mpeg4.c,v 1.9.2.2 2003-06-09 13:55:25 edgomez Exp $
  *  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: quant_mpeg4.c,v 1.6 2002-11-17 00:41:19 edgomez Exp $  
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    
 /*****************************************************************************  
  * Functions  
  ****************************************************************************/  
   
60  /*    quantize intra-block  /*    quantize intra-block
61     *
62      // const int32_t quantd = DIV_DIV(VM18P*quant, VM18Q);   * const int32_t quantd = DIV_DIV(VM18P*quant, VM18Q);
63      //   * level = DIV_DIV(16 * data[i], default_intra_matrix[i]);
64      // level = DIV_DIV(16 * data[i], default_intra_matrix[i]);   * coeff[i] = (level + quantd) / quant2;
     // coeff[i] = (level + quantd) / quant2;  
65  */  */
66    
67  void  void
# Line 144  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
# Line 174  Line 132 
132    
133                          level = (level * intra_matrix[i] * quant) >> 3;                          level = (level * intra_matrix[i] * quant) >> 3;
134                          data[i] = (level <= 2048 ? -(int16_t) level : -2048);                          data[i] = (level <= 2048 ? -(int16_t) level : -2048);
135                  } else                                  // if (coeff[i] > 0)                  } else                                  /* if (coeff[i] > 0) */
136                  {                  {
137                          uint32_t level = coeff[i];                          uint32_t level = coeff[i];
138    
# Line 187  Line 145 
145    
146    
147  /*    quantize inter-block  /*    quantize inter-block
148     *
149      // level = DIV_DIV(16 * data[i], default_intra_matrix[i]);   * level = DIV_DIV(16 * data[i], default_intra_matrix[i]);
150      // coeff[i] = (level + quantd) / quant2;   * coeff[i] = (level + quantd) / quant2;
151      // sum += abs(level);   * sum += abs(level);
152  */  */
153    
154  uint32_t  uint32_t
# Line 252  Line 210 
210    
211                          level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4;                          level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4;
212                          data[i] = (level <= 2048 ? -level : -2048);                          data[i] = (level <= 2048 ? -level : -2048);
213                  } else                                  // if (coeff[i] > 0)                  } else                                  /* if (coeff[i] > 0) */
214                  {                  {
215                          uint32_t level = coeff[i];                          uint32_t level = coeff[i];
216    
# Line 263  Line 221 
221                  sum ^= data[i];                  sum ^= data[i];
222          }          }
223    
224          // mismatch control          /*  mismatch control */
225    
226          if ((sum & 1) == 0) {          if ((sum & 1) == 0) {
227                  data[63] ^= 1;                  data[63] ^= 1;
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