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revision 3, Fri Mar 8 02:46:11 2002 UTC revision 406, Wed Sep 4 21:59:27 2002 UTC
# Line 1  Line 1 
1    /*****************************************************************************
2     *
3     *  XVID MPEG-4 VIDEO CODEC
4     *  - Global structures, constants -
5     *
6     *  Copyright(C) 2002 Michael Militzer
7     *
8     *  This program is an implementation of a part of one or more MPEG-4
9     *  Video tools as specified in ISO/IEC 14496-2 standard.  Those intending
10     *  to use this software module in hardware or software products are
11     *  advised that its use may infringe existing patents or copyrights, and
12     *  any such use would be at such party's own risk.  The original
13     *  developer of this software module and his/her company, and subsequent
14     *  editors and their companies, will have no liability for use of this
15     *  software or modifications or derivatives thereof.
16     *
17     *  This program is free software ; you can redistribute it and/or modify
18     *  it under the terms of the GNU General Public License as published by
19     *  the Free Software Foundation ; either version 2 of the License, or
20     *  (at your option) any later version.
21     *
22     *  This program is distributed in the hope that it will be useful,
23     *  but WITHOUT ANY WARRANTY ; without even the implied warranty of
24     *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25     *  GNU General Public License for more details.
26     *
27     *  You should have received a copy of the GNU General Public License
28     *  along with this program ; if not, write to the Free Software
29     *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
30     *
31     * $Id: global.h,v 1.14 2002-09-04 21:59:27 edgomez Exp $
32     *
33     ****************************************************************************/
34    
35  #ifndef _GLOBAL_H_  #ifndef _GLOBAL_H_
36  #define _GLOBAL_H_  #define _GLOBAL_H_
37    
38    #include "xvid.h"
39  #include "portab.h"  #include "portab.h"
40    
41  /* --- macroblock stuff --- */  /* --- macroblock modes --- */
42    
43  #define MODE_INTER              0  #define MODE_INTER              0
44  #define MODE_INTER_Q    1  #define MODE_INTER_Q    1
# Line 13  Line 48 
48  #define MODE_STUFFING   7  #define MODE_STUFFING   7
49  #define MODE_NOT_CODED  16  #define MODE_NOT_CODED  16
50    
51    /* --- bframe specific --- */
52    
53    #define MODE_DIRECT                     0
54    #define MODE_INTERPOLATE        1
55    #define MODE_BACKWARD           2
56    #define MODE_FORWARD            3
57    #define MODE_DIRECT_NONE_MV     4
58    
59    
60  typedef struct  typedef struct
61  {  {
62          int x;          uint32_t bufa;
63          int y;          uint32_t bufb;
64  } VECTOR;          uint32_t buf;
65            uint32_t pos;
66            uint32_t *tail;
67            uint32_t *start;
68            uint32_t length;
69    }
70    Bitstream;
71    
72    
73  #define MBPRED_SIZE  15  #define MBPRED_SIZE  15
# Line 27  Line 77 
77  {  {
78          // decoder/encoder          // decoder/encoder
79          VECTOR mvs[4];          VECTOR mvs[4];
         uint32_t sad8[4];               // SAD values for inter4v-VECTORs  
         uint32_t sad16;                 // SAD value for inter-VECTOR  
80    
81      short int pred_values[6][MBPRED_SIZE];      short int pred_values[6][MBPRED_SIZE];
82      int acpred_directions[6];      int acpred_directions[6];
# Line 36  Line 84 
84          int mode;          int mode;
85          int quant;              // absolute quant          int quant;              // absolute quant
86    
87            int field_dct;
88            int field_pred;
89            int field_for_top;
90            int field_for_bot;
91    
92          // encoder specific          // encoder specific
93    
94            VECTOR mv16;
95          VECTOR pmvs[4];          VECTOR pmvs[4];
96    
97            int32_t sad8[4];                        // SAD values for inter4v-VECTORs
98            int32_t sad16;                          // SAD value for inter-VECTOR
99    
100          int dquant;          int dquant;
101          int cbp;          int cbp;
102    
103  } MACROBLOCK;          // bframe stuff
104    
105  static __inline int8_t get_dc_scaler(int32_t quant, uint32_t lum)          VECTOR b_mvs[4];
106  {          VECTOR b_pmvs[4];
     int8_t dc_scaler;  
107    
108          if(quant > 0 && quant < 5) {          // bframe direct mode
         dc_scaler = 8;  
                 return dc_scaler;  
         }  
109    
110          if(quant < 25 && !lum) {          VECTOR directmv[4];
111          dc_scaler = (quant + 13) >> 1;          VECTOR deltamv;
                 return dc_scaler;  
         }  
112    
113          if(quant < 9) {          int mb_type;
114          dc_scaler = quant << 1;          int dbquant;
115                  return dc_scaler;  
116          }          // stuff for block based ME (needed for Qpel ME)
117            // backup of last integer ME vectors/sad
118    
119            VECTOR i_mv16;
120            VECTOR i_mvs[4];
121    
122            int32_t i_sad8[4];      // SAD values for inter4v-VECTORs
123            int32_t i_sad16;        // SAD value for inter-VECTOR
124    
     if(quant < 25) {  
         dc_scaler = quant + 8;  
                 return dc_scaler;  
125          }          }
126    MACROBLOCK;
127    
128    static __inline int8_t
129    get_dc_scaler(uint32_t quant,
130                              uint32_t lum)
131    {
132            if (quant < 5)
133                    return 8;
134    
135            if (quant < 25 && !lum)
136                    return (quant + 13) / 2;
137    
138            if (quant < 9)
139                    return 2 * quant;
140    
141            if (quant < 25)
142                    return quant + 8;
143    
144          if(lum)          if(lum)
145                  dc_scaler = (quant << 1) - 16;                  return 2 * quant - 16;
146          else          else
147          dc_scaler = quant - 6;                  return quant - 6;
   
     return dc_scaler;  
148  }  }
149    
150    // useful macros
151    
152    #define MIN(X, Y) ((X)<(Y)?(X):(Y))
153    #define MAX(X, Y) ((X)>(Y)?(X):(Y))
154    #define ABS(X)    (((X)>0)?(X):-(X))
155    #define SIGN(X)   (((X)>0)?1:-1)
156    
157    
158  #endif /* _GLOBAL_H_ */  #endif /* _GLOBAL_H_ */

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