int low;
int range;
int outstanding_count;
-#ifdef STRICT_LIMITS
- int symCount;
-#endif
const uint8_t *bytestream_start;
const uint8_t *bytestream;
const uint8_t *bytestream_end;
void ff_init_cabac_states(CABACContext *c);
-static inline void put_cabac_bit(CABACContext *c, int b){
- put_bits(&c->pb, 1, b);
- for(;c->outstanding_count; c->outstanding_count--){
- put_bits(&c->pb, 1, 1-b);
- }
-}
-
-static inline void renorm_cabac_encoder(CABACContext *c){
- while(c->range < 0x100){
- //FIXME optimize
- if(c->low<0x100){
- put_cabac_bit(c, 0);
- }else if(c->low<0x200){
- c->outstanding_count++;
- c->low -= 0x100;
- }else{
- put_cabac_bit(c, 1);
- c->low -= 0x200;
- }
-
- c->range+= c->range;
- c->low += c->low;
- }
-}
-
static void refill(CABACContext *c){
#if CABAC_BITS == 16
c->low+= (c->bytestream[0]<<9) + (c->bytestream[1]<<1);
c->bytestream+= CABAC_BITS/8;
}
-static inline void renorm_cabac_decoder(CABACContext *c){
- while(c->range < 0x100){
- c->range+= c->range;
- c->low+= c->low;
- if(!(c->low & CABAC_MASK))
- refill(c);
- }
-}
-
static inline void renorm_cabac_decoder_once(CABACContext *c){
int shift= (uint32_t)(c->range - 0x100)>>31;
c->range<<= shift;
}
}
-#if 0
-/**
- * Get (truncated) unary binarization.
- */
-static int get_cabac_u(CABACContext *c, uint8_t * state, int max, int max_index, int truncated){
- int i;
-
- for(i=0; i<max; i++){
- if(get_cabac(c, state)==0)
- return i;
-
- if(i< max_index) state++;
- }
-
- return truncated ? max : -1;
-}
-
-/**
- * get unary exp golomb k-th order binarization.
- */
-static int get_cabac_ueg(CABACContext *c, uint8_t * state, int max, int is_signed, int k, int max_index){
- int i, v;
- int m= 1<<k;
-
- if(get_cabac(c, state)==0)
- return 0;
-
- if(0 < max_index) state++;
-
- for(i=1; i<max; i++){
- if(get_cabac(c, state)==0){
- if(is_signed && get_cabac_bypass(c)){
- return -i;
- }else
- return i;
- }
-
- if(i < max_index) state++;
- }
-
- while(get_cabac_bypass(c)){
- i+= m;
- m+= m;
- }
-
- v=0;
- while(m>>=1){
- v+= v + get_cabac_bypass(c);
- }
- i += v;
-
- if(is_signed && get_cabac_bypass(c)){
- return -i;
- }else
- return i;
-}
-#endif /* 0 */
-
#endif /* AVCODEC_CABAC_H */