h264: use a separate GetBitContext for slice data

[ffmpeg] / libavutil / rational.c

diff --git a/libavutil/rational.c b/libavutil/rational.c
index ac5111b896a5d97998dabdaccae3ba6f5897191f..405393619440283bf5ec71468be1b91016ecd5f3 100644 (file)
--- a/libavutil/rational.c
+++ b/libavutil/rational.c
@@ -26,82 +26,92 @@
  */
 
 #include "avassert.h"
-//#include <math.h>
 #include <limits.h>
 
 #include "common.h"
 #include "mathematics.h"
 #include "rational.h"
 
-int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max){
-    AVRational a0={0,1}, a1={1,0};
-    int sign= (num<0) ^ (den<0);
-    int64_t gcd= av_gcd(FFABS(num), FFABS(den));
+int av_reduce(int *dst_num, int *dst_den,
+              int64_t num, int64_t den, int64_t max)
+{
+    AVRational a0 = { 0, 1 }, a1 = { 1, 0 };
+    int sign = (num < 0) ^ (den < 0);
+    int64_t gcd = av_gcd(FFABS(num), FFABS(den));
 
-    if(gcd){
-        num = FFABS(num)/gcd;
-        den = FFABS(den)/gcd;
+    if (gcd) {
+        num = FFABS(num) / gcd;
+        den = FFABS(den) / gcd;
     }
-    if(num<=max && den<=max){
-        a1= (AVRational){num, den};
-        den=0;
+    if (num <= max && den <= max) {
+        a1 = (AVRational) { num, den };
+        den = 0;
     }
 
-    while(den){
-        uint64_t x      = num / den;
-        int64_t next_den= num - den*x;
-        int64_t a2n= x*a1.num + a0.num;
-        int64_t a2d= x*a1.den + a0.den;
+    while (den) {
+        uint64_t x        = num / den;
+        int64_t next_den  = num - den * x;
+        int64_t a2n       = x * a1.num + a0.num;
+        int64_t a2d       = x * a1.den + a0.den;
 
-        if(a2n > max || a2d > max){
-            if(a1.num) x= (max - a0.num) / a1.num;
-            if(a1.den) x= FFMIN(x, (max - a0.den) / a1.den);
+        if (a2n > max || a2d > max) {
+            if (a1.num) x =          (max - a0.num) / a1.num;
+            if (a1.den) x = FFMIN(x, (max - a0.den) / a1.den);
 
-            if (den*(2*x*a1.den + a0.den) > num*a1.den)
-                a1 = (AVRational){x*a1.num + a0.num, x*a1.den + a0.den};
+            if (den * (2 * x * a1.den + a0.den) > num * a1.den)
+                a1 = (AVRational) { x * a1.num + a0.num, x * a1.den + a0.den };
             break;
         }
 
-        a0= a1;
-        a1= (AVRational){a2n, a2d};
-        num= den;
-        den= next_den;
+        a0  = a1;
+        a1  = (AVRational) { a2n, a2d };
+        num = den;
+        den = next_den;
     }
     av_assert2(av_gcd(a1.num, a1.den) <= 1U);
 
     *dst_num = sign ? -a1.num : a1.num;
     *dst_den = a1.den;
 
-    return den==0;
+    return den == 0;
 }
 
-AVRational av_mul_q(AVRational b, AVRational c){
-    av_reduce(&b.num, &b.den, b.num * (int64_t)c.num, b.den * (int64_t)c.den, INT_MAX);
+AVRational av_mul_q(AVRational b, AVRational c)
+{
+    av_reduce(&b.num, &b.den,
+               b.num * (int64_t) c.num,
+               b.den * (int64_t) c.den, INT_MAX);
     return b;
 }
 
-AVRational av_div_q(AVRational b, AVRational c){
-    return av_mul_q(b, (AVRational){c.den, c.num});
+AVRational av_div_q(AVRational b, AVRational c)
+{
+    return av_mul_q(b, (AVRational) { c.den, c.num });
 }
 
-AVRational av_add_q(AVRational b, AVRational c){
-    av_reduce(&b.num, &b.den, b.num * (int64_t)c.den + c.num * (int64_t)b.den, b.den * (int64_t)c.den, INT_MAX);
+AVRational av_add_q(AVRational b, AVRational c) {
+    av_reduce(&b.num, &b.den,
+               b.num * (int64_t) c.den +
+               c.num * (int64_t) b.den,
+               b.den * (int64_t) c.den, INT_MAX);
     return b;
 }
 
-AVRational av_sub_q(AVRational b, AVRational c){
-    return av_add_q(b, (AVRational){-c.num, c.den});
+AVRational av_sub_q(AVRational b, AVRational c)
+{
+    return av_add_q(b, (AVRational) { -c.num, c.den });
 }
 
-AVRational av_d2q(double d, int max){
+AVRational av_d2q(double d, int max)
+{
     AVRational a;
 #define LOG2  0.69314718055994530941723212145817656807550013436025
     int exponent;
     int64_t den;
     if (isnan(d))
-        return (AVRational){0,0};
+        return (AVRational) { 0,0 };
     if (isinf(d))
-        return (AVRational){ d<0 ? -1:1, 0 };
+        return (AVRational) { d < 0 ? -1 : 1, 0 };
     exponent = FFMAX( (int)(log(fabs(d) + 1e-20)/LOG2), 0);
     den = 1LL << (61 - exponent);
     av_reduce(&a.num, &a.den, (int64_t)(d * den + 0.5), den, max);
@@ -127,31 +137,9 @@ int av_nearer_q(AVRational q, AVRational q1, AVRational q2)
 int av_find_nearest_q_idx(AVRational q, const AVRational* q_list)
 {
     int i, nearest_q_idx = 0;
-    for(i=0; q_list[i].den; i++)
+    for (i = 0; q_list[i].den; i++)
         if (av_nearer_q(q, q_list[i], q_list[nearest_q_idx]) > 0)
             nearest_q_idx = i;
 
     return nearest_q_idx;
 }
-
-#ifdef TEST
-int main(void)
-{
-    AVRational a,b;
-    for(a.num=-2; a.num<=2; a.num++){
-        for(a.den=-2; a.den<=2; a.den++){
-            for(b.num=-2; b.num<=2; b.num++){
-                for(b.den=-2; b.den<=2; b.den++){
-                    int c= av_cmp_q(a,b);
-                    double d= av_q2d(a) == av_q2d(b) ? 0 : (av_q2d(a) - av_q2d(b));
-                    if(d>0) d=1;
-                    else if(d<0) d=-1;
-                    else if(d != d) d= INT_MIN;
-                    if(c!=d) av_log(0, AV_LOG_ERROR, "%d/%d %d/%d, %d %f\n", a.num, a.den, b.num, b.den, c,d);
-                }
-            }
-        }
-    }
-    return 0;
-}
-#endif