/*
* Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * FFmpeg 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 this library; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
*/
#include "common.h"
-#include "integer.h"
#include "mathematics.h"
const uint8_t ff_sqrt_tab[128]={
}
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd){
- AVInteger ai;
int64_t r=0;
assert(c > 0);
assert(b >=0);
return (a * b + r)/c;
else
return a/c*b + (a%c*b + r)/c;
- }
+ }else{
+#if 1
+ uint64_t a0= a&0xFFFFFFFF;
+ uint64_t a1= a>>32;
+ uint64_t b0= b&0xFFFFFFFF;
+ uint64_t b1= b>>32;
+ uint64_t t1= a0*b1 + a1*b0;
+ uint64_t t1a= t1<<32;
+ int i;
- ai= av_mul_i(av_int2i(a), av_int2i(b));
- ai= av_add_i(ai, av_int2i(r));
+ a0 = a0*b0 + t1a;
+ a1 = a1*b1 + (t1>>32) + (a0<t1a);
+ a0 += r;
+ a1 += a0<r;
- return av_i2int(av_div_i(ai, av_int2i(c)));
+ for(i=63; i>=0; i--){
+// int o= a1 & 0x8000000000000000ULL;
+ a1+= a1 + ((a0>>i)&1);
+ t1+=t1;
+ if(/*o || */c <= a1){
+ a1 -= c;
+ t1++;
+ }
+ }
+ return t1;
+ }
+#else
+ AVInteger ai;
+ ai= av_mul_i(av_int2i(a), av_int2i(b));
+ ai= av_add_i(ai, av_int2i(r));
+
+ return av_i2int(av_div_i(ai, av_int2i(c)));
+ }
+#endif
}
int64_t av_rescale(int64_t a, int64_t b, int64_t c){
int64_t c= cq.num * (int64_t)bq.den;
return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF);
}
+#if 0
+#include "integer.h"
+#undef printf
+main(){
+ int64_t a,b,c,d,e;
+
+ for(a=7; a<(1LL<<62); a+=a/3+1){
+ for(b=3; b<(1LL<<62); b+=b/4+1){
+ for(c=9; c<(1LL<<62); c+=(c*2)/5+3){
+ int64_t r= c/2;
+ AVInteger ai;
+ ai= av_mul_i(av_int2i(a), av_int2i(b));
+ ai= av_add_i(ai, av_int2i(r));
+
+ d= av_i2int(av_div_i(ai, av_int2i(c)));
+
+ e= av_rescale(a,b,c);
+
+ if((double)a * (double)b / (double)c > (1LL<<63))
+ continue;
+
+ if(d!=e) printf("%"PRId64"*%"PRId64"/%"PRId64"= %"PRId64"=%"PRId64"\n", a, b, c, d, e);
+ }
+ }
+ }
+}
+#endif