Do not try to set a video standard unless "-tvstd" is specified

[ffmpeg] / libavutil / mathematics.c

diff --git a/libavutil/mathematics.c b/libavutil/mathematics.c
index 3cd47a8ac0cf19c17c6e88dd43ae8f7d9a9db5d2..4be027d9da2adf194fe5b6b5ba2d3a49fdc4724c 100644 (file)
--- a/libavutil/mathematics.c
+++ b/libavutil/mathematics.c
@@ -1,18 +1,20 @@
 /*
  * 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
  */
 
@@ -22,7 +24,6 @@
  */
 
 #include "common.h"
-#include "integer.h"
 #include "mathematics.h"
 
 const uint8_t ff_sqrt_tab[128]={
@@ -49,7 +50,6 @@ 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);
@@ -65,12 +65,40 @@ 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;
 
-    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){
@@ -82,3 +110,30 @@ 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("%"PRId64"*%"PRId64"/%"PRId64"= %"PRId64"=%"PRId64"\n", a, b, c, d, e);
+            }
+        }
+    }
+}
+#endif