sync FFmpeg tree

CVS patchset: 8149
CVS date: 2006/08/02 07:12:57

1 files changed, 65 insertions, 12 deletions

diff --git a/src/libffmpeg/libavutil/mathematics.c b/src/libffmpeg/libavutil/mathematics.c
index aa3fd74e0..951324e99 100644
--- a/src/libffmpeg/libavutil/mathematics.c
+++ b/src/libffmpeg/libavutil/mathematics.c
@@ -13,16 +13,15 @@
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
- 
+
 /**
  * @file mathematics.c
  * Miscellaneous math routines and tables.
  */
 
 #include "common.h"
-#include "integer.h"
 #include "mathematics.h"
 
 const uint8_t ff_sqrt_tab[128]={
@@ -49,14 +48,13 @@ int64_t ff_gcd(int64_t a, int64_t b){
 }
 
 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);
     assert(rnd >=0 && rnd<=5 && rnd!=4);
-    
-    if(a<0 && a != INT64_MIN) return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd>>1)&1)); 
-    
+
+    if(a<0 && a != INT64_MIN) return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd>>1)&1));
+
     if(rnd==AV_ROUND_NEAR_INF) r= c/2;
     else if(rnd&1)             r= c-1;
 
@@ -65,12 +63,40 @@ int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd){
             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;
+
+        a0 = a0*b0 + t1a;
+        a1 = a1*b1 + (t1>>32) + (a0<t1a);
+        a0 += r;
+        a1 += a0<r;
+
+        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)));
     }
-    
-    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){
@@ -82,3 +108,30 @@ int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq){
     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("%Ld*%Ld/%Ld= %Ld=%Ld\n", a, b, c, d, e);
+            }
+        }
+    }
+}
+#endif