* @author BERO
*/
static inline int get_xbits(GetBitContext *s, int n){
- register int tmp;
+ register int sign;
register int32_t cache;
OPEN_READER(re, s)
UPDATE_CACHE(re, s)
cache = GET_CACHE(re,s);
- if ((int32_t)cache<0) { //MSB=1
- tmp = NEG_USR32(cache,n);
- } else {
- // tmp = (-1<<n) | NEG_USR32(cache,n) + 1; mpeg12.c algo
- // tmp = - (NEG_USR32(cache,n) ^ ((1 << n) - 1)); h263.c algo
- tmp = - NEG_USR32(~cache,n);
- }
+ sign=(~cache)>>31;
LAST_SKIP_BITS(re, s, n)
CLOSE_READER(re, s)
- return tmp;
+ return (NEG_USR32(sign ^ cache, n) ^ sign) - sign;
}
static inline int get_sbits(GetBitContext *s, int n){