mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
#ifndef COMMON_H
|
|
#define COMMON_H
|
|
|
|
typedef unsigned char UINT8;
|
|
typedef unsigned short UINT16;
|
|
typedef unsigned int UINT32;
|
|
typedef signed char INT8;
|
|
typedef signed short INT16;
|
|
typedef signed int INT32;
|
|
|
|
/* bit I/O */
|
|
|
|
struct PutBitContext;
|
|
|
|
typedef void (*WriteDataFunc)(void *, UINT8 *, int);
|
|
|
|
typedef struct PutBitContext {
|
|
UINT8 *buf, *buf_ptr, *buf_end;
|
|
int bit_cnt;
|
|
UINT32 bit_buf;
|
|
long long data_out_size; /* in bytes */
|
|
void *opaque;
|
|
WriteDataFunc write_data;
|
|
} PutBitContext;
|
|
|
|
void init_put_bits(PutBitContext *s,
|
|
UINT8 *buffer, int buffer_size,
|
|
void *opaque,
|
|
void (*write_data)(void *, UINT8 *, int));
|
|
void put_bits(PutBitContext *s, int n, unsigned int value);
|
|
long long get_bit_count(PutBitContext *s);
|
|
void align_put_bits(PutBitContext *s);
|
|
void flush_put_bits(PutBitContext *s);
|
|
|
|
/* jpeg specific put_bits */
|
|
void jput_bits(PutBitContext *s, int n, unsigned int value);
|
|
void jflush_put_bits(PutBitContext *s);
|
|
|
|
/* misc math functions */
|
|
|
|
extern inline int log2(unsigned int v)
|
|
{
|
|
int n;
|
|
|
|
n = 0;
|
|
if (v & 0xffff0000) {
|
|
v >>= 16;
|
|
n += 16;
|
|
}
|
|
if (v & 0xff00) {
|
|
v >>= 8;
|
|
n += 8;
|
|
}
|
|
if (v & 0xf0) {
|
|
v >>= 4;
|
|
n += 4;
|
|
}
|
|
if (v & 0xc) {
|
|
v >>= 2;
|
|
n += 2;
|
|
}
|
|
if (v & 0x2) {
|
|
n++;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
#endif
|