[FFmpeg-devel] [PATCH] avutil/mathematics: correct documentation for av_gcd

Ganesh Ajjanagadde gajjanagadde at gmail.com
Wed Oct 28 01:18:34 CET 2015

av_gcd is now always defined regardless of input. This documents this
change in the "documented API". Two benefits (closely related):
1. The function is robust, and there is no need to worry about INT64_MIN, etc.

2. Clients of av_gcd, like av_reduce, can now be made fully correct. Currently,
av_reduce can trigger undefined behavior if e.g num is INT64_MIN due to
integer overflow in the FFABS. Furthermore, this undefined behavior is
completely undocumented, and could be a fuzzer's paradise. The FFABS was needed in the past as
av_gcd was undefined for negative inputs. In order to make av_reduce
robust, it is essential to guarantee that av_gcd works for all int64_t.

Signed-off-by: Ganesh Ajjanagadde <gajjanagadde at gmail.com>
 libavutil/mathematics.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libavutil/mathematics.h b/libavutil/mathematics.h
index ac94488..6fc2577 100644
--- a/libavutil/mathematics.h
+++ b/libavutil/mathematics.h
@@ -77,9 +77,9 @@ enum AVRounding {
- * Return the greatest common divisor of a and b.
- * If both a and b are 0 or either or both are <0 then behavior is
- * undefined.
+ * Compute the greatest common divisor of a and b.
+ *
+ * @return gcd of a and b up to sign; if a and b are both zero returns 0
 int64_t av_const av_gcd(int64_t a, int64_t b);

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