在H264编解码中,哥伦布指数编码是经常用到的,下面是无符号哥伦布指数编码的C代码:
static inline int bs_read_ue( bs_t *s )
{
int i = 0;
while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
{
i++;
}
return( ( 1 << i) - 1 + bs_read( s, i ) );
}
bs_s结构体:
typedef struct bs_s
{
uint8_t *p_start;
uint8_t *p;
uint8_t *p_end;
int i_left; /* i_count number of available bits */
int i_bits_encoded; /* RD only */
} bs_t;
bs结构体的初始化:
static inline void bs_init( bs_t *s, void *p_data, int i_data )
{
s->p_start = (uint8_t*)p_data;
s->p = (uint8_t*)p_data;
s->p_end = (uint8_t*)s->p + i_data;
s->i_left = 8;
}
从FFMpeg上抄来的