* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
-
+
/**
* @file rangecoder.c
* Range coder.
void ff_init_range_encoder(RangeCoder *c, uint8_t *buf, int buf_size){
- c->bytestream_start=
+ c->bytestream_start=
c->bytestream= buf;
c->bytestream_end= buf + buf_size;
}
void ff_init_range_decoder(RangeCoder *c, const uint8_t *buf, int buf_size){
- ff_init_range_encoder(c, buf, buf_size);
+ /* cast to avoid compiler warning */
+ ff_init_range_encoder(c, (uint8_t *) buf, buf_size);
c->low =(*c->bytestream++)<<8;
c->low+= *c->bytestream++;
void ff_build_rac_states(RangeCoder *c, int factor, int max_p){
const int64_t one= 1LL<<32;
int64_t p;
- int last_p8, p8, i, j;
+ int last_p8, p8, i;
memset(c->zero_state, 0, sizeof(c->zero_state));
memset(c-> one_state, 0, sizeof(c-> one_state));
#if 0
for(i=1; i<256; i++){
- if(c->one_state[i])
+ if(c->one_state[i])
continue;
-
+
p= (i*one + 128) >> 8;
last_p8= i;
for(;;){
if(p8 <= last_p8) p8= last_p8+1;
if(last_p8 && last_p8<256 && p8<=max_p)
c->one_state[last_p8]= p8;
-
+
p+= ((one-p)*factor + one/2) >> 32;
last_p8= p8;
}
#endif
for(i=256-max_p; i<=max_p; i++){
- if(c->one_state[i])
+ if(c->one_state[i])
continue;
p= (i*one + 128) >> 8;
if(p8 > max_p) p8= max_p;
c->one_state[ i]= p8;
}
-
+
for(i=0; i<256; i++)
c->zero_state[i]= 256-c->one_state[256-i];
#if 0
uint8_t r[9*SIZE];
int i;
uint8_t state[10]= {0};
-
+
ff_init_range_encoder(&c, b, SIZE);
ff_build_rac_states(&c, 0.05*(1LL<<32), 128+64+32+16);
-
+
memset(state, 128, sizeof(state));
for(i=0; i<SIZE; i++){
r[i]= random()%7;
}
-
-
+
+
for(i=0; i<SIZE; i++){
START_TIMER
put_rac(&c, state, r[i]&1);
}
ff_put_rac_terminate(&c);
-
+
ff_init_range_decoder(&c, b, SIZE);
-
+
memset(state, 128, sizeof(state));
-
+
for(i=0; i<SIZE; i++){
START_TIMER
if( (r[i]&1) != get_rac(&c, state) )
av_log(NULL, AV_LOG_DEBUG, "rac failure at %d\n", i);
STOP_TIMER("get_rac")
}
-
+
return 0;
}