added HAVE_AV_CONFIG_H
[libav.git] / libavcodec / common.h
1 #ifndef COMMON_H
2 #define COMMON_H
3
4 #ifdef HAVE_AV_CONFIG_H
5 #include "../config.h"
6 #endif
7
8 #ifndef __WINE_WINDEF16_H
9 /* workaround for typedef conflict in MPlayer (wine typedefs) */
10 typedef unsigned short UINT16;
11 typedef signed short INT16;
12 #endif
13
14 typedef unsigned char UINT8;
15 typedef unsigned int UINT32;
16 typedef unsigned long long UINT64;
17 typedef signed char INT8;
18 typedef signed int INT32;
19 typedef signed long long INT64;
20
21 /* bit output */
22
23 struct PutBitContext;
24
25 typedef void (*WriteDataFunc)(void *, UINT8 *, int);
26
27 typedef struct PutBitContext {
28 UINT8 *buf, *buf_ptr, *buf_end;
29 int bit_cnt;
30 UINT32 bit_buf;
31 long long data_out_size; /* in bytes */
32 void *opaque;
33 WriteDataFunc write_data;
34 } PutBitContext;
35
36 void init_put_bits(PutBitContext *s,
37 UINT8 *buffer, int buffer_size,
38 void *opaque,
39 void (*write_data)(void *, UINT8 *, int));
40 void put_bits(PutBitContext *s, int n, unsigned int value);
41 long long get_bit_count(PutBitContext *s);
42 void align_put_bits(PutBitContext *s);
43 void flush_put_bits(PutBitContext *s);
44
45 /* jpeg specific put_bits */
46 void jput_bits(PutBitContext *s, int n, unsigned int value);
47 void jflush_put_bits(PutBitContext *s);
48
49 /* bit input */
50
51 typedef struct GetBitContext {
52 UINT8 *buf, *buf_ptr, *buf_end;
53 int bit_cnt;
54 UINT32 bit_buf;
55 } GetBitContext;
56
57 typedef struct VLC {
58 int bits;
59 INT16 *table_codes;
60 INT8 *table_bits;
61 int table_size, table_allocated;
62 } VLC;
63
64 void init_get_bits(GetBitContext *s,
65 UINT8 *buffer, int buffer_size);
66
67 unsigned int get_bits(GetBitContext *s, int n);
68 void align_get_bits(GetBitContext *s);
69 int init_vlc(VLC *vlc, int nb_bits, int nb_codes,
70 const void *bits, int bits_wrap, int bits_size,
71 const void *codes, int codes_wrap, int codes_size);
72 void free_vlc(VLC *vlc);
73 int get_vlc(GetBitContext *s, VLC *vlc);
74
75 /* macro to go faster */
76 /* n must be <= 24 */
77 /* XXX: optimize buffer end test */
78 #define SHOW_BITS(s, val, n)\
79 {\
80 if (bit_cnt < n && buf_ptr < (s)->buf_end) {\
81 bit_buf |= *buf_ptr++ << (24 - bit_cnt);\
82 bit_cnt += 8;\
83 if (bit_cnt < n && buf_ptr < (s)->buf_end) {\
84 bit_buf |= *buf_ptr++ << (24 - bit_cnt);\
85 bit_cnt += 8;\
86 if (bit_cnt < n && buf_ptr < (s)->buf_end) {\
87 bit_buf |= *buf_ptr++ << (24 - bit_cnt);\
88 bit_cnt += 8;\
89 }\
90 }\
91 }\
92 val = bit_buf >> (32 - n);\
93 }
94
95 /* SHOW_BITS with n1 >= n must be been done before */
96 #define FLUSH_BITS(n)\
97 {\
98 bit_buf <<= n;\
99 bit_cnt -= n;\
100 }
101
102 #define SAVE_BITS(s) \
103 {\
104 bit_cnt = (s)->bit_cnt;\
105 bit_buf = (s)->bit_buf;\
106 buf_ptr = (s)->buf_ptr;\
107 }
108
109 #define RESTORE_BITS(s) \
110 {\
111 (s)->buf_ptr = buf_ptr;\
112 (s)->bit_buf = bit_buf;\
113 (s)->bit_cnt = bit_cnt;\
114 }
115
116 /* define it to include statistics code (useful only for optimizing
117 codec efficiency */
118 //#define STATS
119
120 #ifdef STATS
121
122 enum {
123 ST_UNKNOWN,
124 ST_DC,
125 ST_INTRA_AC,
126 ST_INTER_AC,
127 ST_INTRA_MB,
128 ST_INTER_MB,
129 ST_MV,
130 ST_NB,
131 };
132
133 extern int st_current_index;
134 extern unsigned int st_bit_counts[ST_NB];
135 extern unsigned int st_out_bit_counts[ST_NB];
136
137 void print_stats(void);
138 #endif
139
140 /* misc math functions */
141
142 extern inline int log2(unsigned int v)
143 {
144 int n;
145
146 n = 0;
147 if (v & 0xffff0000) {
148 v >>= 16;
149 n += 16;
150 }
151 if (v & 0xff00) {
152 v >>= 8;
153 n += 8;
154 }
155 if (v & 0xf0) {
156 v >>= 4;
157 n += 4;
158 }
159 if (v & 0xc) {
160 v >>= 2;
161 n += 2;
162 }
163 if (v & 0x2) {
164 n++;
165 }
166 return n;
167 }
168
169 /* memory */
170 void *av_mallocz(int size);
171
172 #endif