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trunk/xvidcore/src/quant/quant_h263.c revision 653, Sun Nov 17 00:41:20 2002 UTC branches/dev-api-4/xvidcore/src/quant/quant_h263.c revision 1174, Tue Oct 7 13:02:35 2003 UTC
# Line 1  Line 1 
1  /**************************************************************************  /*****************************************************************************
2   *   *
3   *      XVID MPEG-4 VIDEO CODEC   *      XVID MPEG-4 VIDEO CODEC
4   *      - quantization/dequantization -   *  - MPEG4 Quantization H263 implementation -
5   *   *
6   *  This file is part of XviD, a free MPEG-4 video encoder/decoder   *  Copyright(C) 2001-2003 Peter Ross <pross@xvid.org>
7   *   *
8   *  XviD is free software; you can redistribute it and/or modify it   *  This program is free software ; you can redistribute it and/or modify
9   *  under the terms of the GNU General Public License as published by   *  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 19  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_h263.c,v 1.7.2.2 2003-10-07 13:02:35 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.  
23   *   *
24   * $Id: quant_h263.c,v 1.4 2002-11-17 00:41:19 edgomez Exp $   ****************************************************************************/
  *  
  *************************************************************************/  
25    
26  #include "quant_h263.h"  #include "../global.h"
27    #include "quant.h"
28    
29  /*      mutliply+shift division table  /*****************************************************************************
30  */   * Global function pointers
31     ****************************************************************************/
32    
33    /* Quant */
34    quant_intraFuncPtr quant_h263_intra;
35    quant_interFuncPtr quant_h263_inter;
36    
37    /* DeQuant */
38    quant_intraFuncPtr dequant_h263_intra;
39    quant_interFuncPtr dequant_h263_inter;
40    
41    /*****************************************************************************
42     * Local data
43     ****************************************************************************/
44    
45    /* divide-by-multiply table
46     * a 16 bit shiting is enough in this case */
47    
48  #define SCALEBITS       16  #define SCALEBITS       16
49  #define FIX(X)          ((1L << SCALEBITS) / (X) + 1)  #define FIX(X)          ((1L << SCALEBITS) / (X) + 1)
50    
51  static const uint32_t multipliers[32] = {  static const uint32_t multipliers[32] =
52    {
53          0, FIX(2), FIX(4), FIX(6),          0, FIX(2), FIX(4), FIX(6),
54          FIX(8), FIX(10), FIX(12), FIX(14),          FIX(8), FIX(10), FIX(12), FIX(14),
55          FIX(16), FIX(18), FIX(20), FIX(22),          FIX(16), FIX(18), FIX(20), FIX(22),
# Line 71  Line 60 
60          FIX(56), FIX(58), FIX(60), FIX(62)          FIX(56), FIX(58), FIX(60), FIX(62)
61  };  };
62    
63    /*****************************************************************************
64     * Function definitions
65  #define DIV_DIV(a, b) ((a)>0) ? ((a)+((b)>>1))/(b) : ((a)-((b)>>1))/(b)   ****************************************************************************/
   
 // function pointers  
 quanth263_intraFuncPtr quant_intra;  
 quanth263_intraFuncPtr dequant_intra;  
   
 quanth263_interFuncPtr quant_inter;  
 dequanth263_interFuncPtr dequant_inter;  
   
   
66    
67  /*      quantize intra-block  /*      quantize intra-block
68  */  */
69    
70    uint32_t
71  void  quant_h263_intra_c(int16_t * coeff,
 quant_intra_c(int16_t * coeff,  
72                            const int16_t * data,                            const int16_t * data,
73                            const uint32_t quant,                            const uint32_t quant,
74                            const uint32_t dcscalar)                            const uint32_t dcscalar)
75  {  {
76          const uint32_t mult = multipliers[quant];          const uint32_t mult = multipliers[quant];
77          const uint16_t quant_m_2 = quant << 1;          const uint16_t quant_m_2 = quant << 1;
78          uint32_t i;          uint32_t sum = 0;
79            int i;
80    
81          coeff[0] = DIV_DIV(data[0], (int32_t) dcscalar);          coeff[0] = DIV_DIV(data[0], (int32_t) dcscalar);
82            sum += coeff[0];
83    
84          for (i = 1; i < 64; i++) {          for (i = 1; i < 64; i++) {
85                  int16_t acLevel = data[i];                  int16_t acLevel = data[i];
# Line 110  Line 91 
91                                  continue;                                  continue;
92                          }                          }
93                          acLevel = (acLevel * mult) >> SCALEBITS;                          acLevel = (acLevel * mult) >> SCALEBITS;
94                            sum += acLevel;
95                          coeff[i] = -acLevel;                          coeff[i] = -acLevel;
96                  } else {                  } else {
97                          if (acLevel < quant_m_2) {                          if (acLevel < quant_m_2) {
# Line 117  Line 99 
99                                  continue;                                  continue;
100                          }                          }
101                          acLevel = (acLevel * mult) >> SCALEBITS;                          acLevel = (acLevel * mult) >> SCALEBITS;
102                            sum += acLevel;
103                          coeff[i] = acLevel;                          coeff[i] = acLevel;
104                  }                  }
105          }          }
106    
107            return(sum);
108  }  }
109    
110    
# Line 127  Line 112 
112  */  */
113    
114  uint32_t  uint32_t
115  quant_inter_c(int16_t * coeff,  quant_h263_inter_c(int16_t * coeff,
116                            const int16_t * data,                            const int16_t * data,
117                            const uint32_t quant)                            const uint32_t quant)
118  {  {
119          const uint32_t mult = multipliers[quant];          const uint32_t mult = multipliers[quant];
120          const uint16_t quant_m_2 = quant << 1;          const uint16_t quant_m_2 = quant << 1;
121          const uint16_t quant_d_2 = quant >> 1;          const uint16_t quant_d_2 = quant >> 1;
122          int sum = 0;          uint32_t sum = 0;
123          uint32_t i;          uint32_t i;
124    
125          for (i = 0; i < 64; i++) {          for (i = 0; i < 64; i++) {
# Line 148  Line 133 
133                          }                          }
134    
135                          acLevel = (acLevel * mult) >> SCALEBITS;                          acLevel = (acLevel * mult) >> SCALEBITS;
136                          sum += acLevel;         // sum += |acLevel|                          sum += acLevel;         /* sum += |acLevel| */
137                          coeff[i] = -acLevel;                          coeff[i] = -acLevel;
138                  } else {                  } else {
139                          acLevel -= quant_d_2;                          acLevel -= quant_d_2;
# Line 162  Line 147 
147                  }                  }
148          }          }
149    
150          return sum;          return(sum);
151  }  }
152    
153    
154  /*      dequantize intra-block & clamp to [-2048,2047]  /*      dequantize intra-block & clamp to [-2048,2047]
155  */  */
156    
157  void  uint32_t
158  dequant_intra_c(int16_t * data,  dequant_h263_intra_c(int16_t * data,
159                                  const int16_t * coeff,                                  const int16_t * coeff,
160                                  const uint32_t quant,                                  const uint32_t quant,
161                                  const uint32_t dcscalar)                                  const uint32_t dcscalar)
162  {  {
163          const int32_t quant_m_2 = quant << 1;          const int32_t quant_m_2 = quant << 1;
164          const int32_t quant_add = (quant & 1 ? quant : quant - 1);          const int32_t quant_add = (quant & 1 ? quant : quant - 1);
165          uint32_t i;          int i;
166    
167          data[0] = coeff[0] * dcscalar;          data[0] = coeff[0] * dcscalar;
168          if (data[0] < -2048) {          if (data[0] < -2048) {
# Line 186  Line 171 
171                  data[0] = 2047;                  data[0] = 2047;
172          }          }
173    
   
174          for (i = 1; i < 64; i++) {          for (i = 1; i < 64; i++) {
175                  int32_t acLevel = coeff[i];                  int32_t acLevel = coeff[i];
176    
# Line 195  Line 179 
179                  } else if (acLevel < 0) {                  } else if (acLevel < 0) {
180                          acLevel = quant_m_2 * -acLevel + quant_add;                          acLevel = quant_m_2 * -acLevel + quant_add;
181                          data[i] = (acLevel <= 2048 ? -acLevel : -2048);                          data[i] = (acLevel <= 2048 ? -acLevel : -2048);
182                  } else                                  //  if (acLevel > 0) {                  } else {
                 {  
183                          acLevel = quant_m_2 * acLevel + quant_add;                          acLevel = quant_m_2 * acLevel + quant_add;
184                          data[i] = (acLevel <= 2047 ? acLevel : 2047);                          data[i] = (acLevel <= 2047 ? acLevel : 2047);
185                  }                  }
186          }          }
187    
188            return(0);
189  }  }
190    
191    
# Line 208  Line 193 
193  /* dequantize inter-block & clamp to [-2048,2047]  /* dequantize inter-block & clamp to [-2048,2047]
194  */  */
195    
196  void  uint32_t
197  dequant_inter_c(int16_t * data,  dequant_h263_inter_c(int16_t * data,
198                                  const int16_t * coeff,                                  const int16_t * coeff,
199                                  const uint32_t quant)                                  const uint32_t quant)
200  {  {
201          const uint16_t quant_m_2 = quant << 1;          const uint16_t quant_m_2 = quant << 1;
202          const uint16_t quant_add = (quant & 1 ? quant : quant - 1);          const uint16_t quant_add = (quant & 1 ? quant : quant - 1);
203          uint32_t i;          int i;
204    
205          for (i = 0; i < 64; i++) {          for (i = 0; i < 64; i++) {
206                  int16_t acLevel = coeff[i];                  int16_t acLevel = coeff[i];
# Line 225  Line 210 
210                  } else if (acLevel < 0) {                  } else if (acLevel < 0) {
211                          acLevel = acLevel * quant_m_2 - quant_add;                          acLevel = acLevel * quant_m_2 - quant_add;
212                          data[i] = (acLevel >= -2048 ? acLevel : -2048);                          data[i] = (acLevel >= -2048 ? acLevel : -2048);
213                  } else                                  // if (acLevel > 0)                  } else {
                 {  
214                          acLevel = acLevel * quant_m_2 + quant_add;                          acLevel = acLevel * quant_m_2 + quant_add;
215                          data[i] = (acLevel <= 2047 ? acLevel : 2047);                          data[i] = (acLevel <= 2047 ? acLevel : 2047);
216                  }                  }
217          }          }
218    
219            return(0);
220  }  }
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