mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
171 lines
3.6 KiB
C
171 lines
3.6 KiB
C
#ifndef COMMON_H
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#define COMMON_H
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#include "../config.h"
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#ifndef __WINE_WINDEF16_H
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/* workaround for typedef conflict in MPlayer (wine typedefs) */
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typedef unsigned short UINT16;
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typedef signed short INT16;
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#endif
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typedef unsigned char UINT8;
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typedef unsigned int UINT32;
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typedef unsigned long long UINT64;
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typedef signed char INT8;
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typedef signed int INT32;
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typedef signed long long INT64;
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/* bit output */
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struct PutBitContext;
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typedef void (*WriteDataFunc)(void *, UINT8 *, int);
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typedef struct PutBitContext {
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UINT8 *buf, *buf_ptr, *buf_end;
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int bit_cnt;
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UINT32 bit_buf;
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long long data_out_size; /* in bytes */
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void *opaque;
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WriteDataFunc write_data;
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} PutBitContext;
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void init_put_bits(PutBitContext *s,
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UINT8 *buffer, int buffer_size,
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void *opaque,
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void (*write_data)(void *, UINT8 *, int));
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void put_bits(PutBitContext *s, int n, unsigned int value);
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long long get_bit_count(PutBitContext *s);
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void align_put_bits(PutBitContext *s);
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void flush_put_bits(PutBitContext *s);
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/* jpeg specific put_bits */
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void jput_bits(PutBitContext *s, int n, unsigned int value);
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void jflush_put_bits(PutBitContext *s);
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/* bit input */
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typedef struct GetBitContext {
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UINT8 *buf, *buf_ptr, *buf_end;
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int bit_cnt;
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UINT32 bit_buf;
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} GetBitContext;
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typedef struct VLC {
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int bits;
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INT16 *table_codes;
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INT8 *table_bits;
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int table_size, table_allocated;
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} VLC;
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void init_get_bits(GetBitContext *s,
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UINT8 *buffer, int buffer_size);
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unsigned int get_bits(GetBitContext *s, int n);
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void align_get_bits(GetBitContext *s);
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int init_vlc(VLC *vlc, int nb_bits, int nb_codes,
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const void *bits, int bits_wrap, int bits_size,
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const void *codes, int codes_wrap, int codes_size);
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void free_vlc(VLC *vlc);
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int get_vlc(GetBitContext *s, VLC *vlc);
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/* macro to go faster */
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/* n must be <= 24 */
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/* XXX: optimize buffer end test */
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#define SHOW_BITS(s, val, n)\
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{\
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if (bit_cnt < n && buf_ptr < (s)->buf_end) {\
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bit_buf |= *buf_ptr++ << (24 - bit_cnt);\
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bit_cnt += 8;\
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if (bit_cnt < n && buf_ptr < (s)->buf_end) {\
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bit_buf |= *buf_ptr++ << (24 - bit_cnt);\
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bit_cnt += 8;\
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if (bit_cnt < n && buf_ptr < (s)->buf_end) {\
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bit_buf |= *buf_ptr++ << (24 - bit_cnt);\
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bit_cnt += 8;\
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}\
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}\
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}\
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val = bit_buf >> (32 - n);\
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}
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/* SHOW_BITS with n1 >= n must be been done before */
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#define FLUSH_BITS(n)\
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{\
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bit_buf <<= n;\
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bit_cnt -= n;\
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}
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#define SAVE_BITS(s) \
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{\
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bit_cnt = (s)->bit_cnt;\
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bit_buf = (s)->bit_buf;\
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buf_ptr = (s)->buf_ptr;\
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}
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#define RESTORE_BITS(s) \
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{\
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(s)->buf_ptr = buf_ptr;\
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(s)->bit_buf = bit_buf;\
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(s)->bit_cnt = bit_cnt;\
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}
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/* define it to include statistics code (useful only for optimizing
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codec efficiency */
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//#define STATS
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#ifdef STATS
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enum {
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ST_UNKNOWN,
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ST_DC,
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ST_INTRA_AC,
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ST_INTER_AC,
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ST_INTRA_MB,
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ST_INTER_MB,
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ST_MV,
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ST_NB,
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};
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extern int st_current_index;
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extern unsigned int st_bit_counts[ST_NB];
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extern unsigned int st_out_bit_counts[ST_NB];
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void print_stats(void);
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#endif
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/* misc math functions */
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extern inline int log2(unsigned int v)
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{
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int n;
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n = 0;
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if (v & 0xffff0000) {
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v >>= 16;
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n += 16;
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}
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if (v & 0xff00) {
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v >>= 8;
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n += 8;
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}
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if (v & 0xf0) {
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v >>= 4;
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n += 4;
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}
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if (v & 0xc) {
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v >>= 2;
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n += 2;
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}
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if (v & 0x2) {
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n++;
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}
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return n;
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}
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/* memory */
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void *av_mallocz(int size);
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#endif
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