* Range coder
* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
*/
/**
- * @file rangecoder.c
+ * @file
* Range coder.
* based upon
* "Range encoding: an algorithm for removing redundancy from a digitised
#include <string.h>
#include "avcodec.h"
-#include "common.h"
#include "rangecoder.h"
+#include "bytestream.h"
void ff_init_range_encoder(RangeCoder *c, uint8_t *buf, int 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++;
+ c->low = bytestream_get_be16(&c->bytestream);
}
void ff_build_rac_states(RangeCoder *c, int factor, int max_p){
return c->bytestream - c->bytestream_start;
}
-#if 0 //selftest
+#ifdef TEST
#define SIZE 10240
-int main(){
+
+#include "libavutil/lfg.h"
+
+int main(void){
RangeCoder c;
uint8_t b[9*SIZE];
uint8_t r[9*SIZE];
int i;
- uint8_t state[10]= {0};
+ uint8_t state[10];
+ AVLFG prng;
+
+ av_lfg_init(&prng, 1);
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;
+ r[i] = av_lfg_get(&prng) % 7;
}
for(i=0; i<SIZE; i++){
STOP_TIMER("put_rac")
}
- ff_put_rac_terminate(&c);
+ ff_rac_terminate(&c);
ff_init_range_decoder(&c, b, SIZE);
return 0;
}
-#endif
+#endif /* TEST */