[PATCH 04/13] Add a special case for av_cmp_q() when one of the values to be compared is 0/0.

[Stefano Sabatini]

---
 libavutil/rational.h |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/libavutil/rational.h b/libavutil/rational.h
index 21542a8..e9933f4 100644
--- a/libavutil/rational.h
+++ b/libavutil/rational.h
@@ -43,9 +43,12 @@ typedef struct AVRational{
  * Compare two rationals.
  * @param a first rational
  * @param b second rational
- * @return 0 if a==b, 1 if a>b and -1 if a<b
+ * @return 0 if a==b, 1 if a>b, -1 if a<b, and INT_MIN if one of the
+ * values is of the form 0/0
  */
 static inline int av_cmp_q(AVRational a, AVRational b){
+    if (a.num == 0 && a.den == 0 || b.num == 0 && b.den == 0)
+        return INT_MIN;
     const int64_t tmp= a.num * (int64_t)b.den - b.num * (int64_t)a.den;
 
     if(tmp) return ((tmp ^ a.den ^ b.den)>>63)|1;
-- 
1.7.1


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