X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavutil%2Frational.c;h=eb148ddb12cc3df93e969a681ece54a2780a7b19;hb=1c7f252783aec37e4ff8049476386f63afe91756;hp=35ee08877f3497379d383b06a7c424a1c940d1cd;hpb=e427ba5c68a522b26a45bf7c61016d9349fab43d;p=ffmpeg

diff --git a/libavutil/rational.c b/libavutil/rational.c
index 35ee08877f3..eb148ddb12c 100644
--- a/libavutil/rational.c
+++ b/libavutil/rational.c
@@ -182,3 +182,12 @@ uint32_t av_q2intfloat(AVRational q) {
 
     return sign<<31 | (150-shift)<<23 | (n - (1<<23));
 }
+
+AVRational av_gcd_q(AVRational a, AVRational b, int max_den, AVRational def)
+{
+    int64_t gcd, lcm;
+
+    gcd = av_gcd(a.den, b.den);
+    lcm = (a.den / gcd) * b.den;
+    return lcm < max_den ? av_make_q(av_gcd(a.num, b.num), lcm) : def;
+}