Implement av_nearer_q() and av_find_nearest_q_idx() functions.

Originally committed as revision 15415 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 13 insertions, 0 deletions

diff --git a/libavutil/rational.h b/libavutil/rational.h
index 5957eee859..70b7735da3 100644
--- a/libavutil/rational.h
+++ b/libavutil/rational.h
@@ -113,4 +113,17 @@ AVRational av_sub_q(AVRational b, AVRational c) av_const;
  */
 AVRational av_d2q(double d, int max) av_const;
 
+/**
+ * @return 1 if \q1 is nearer to \p q than \p q2, -1 if \p q2 is nearer
+ * than \p q1, 0 if they have the same distance.
+ */
+int av_nearer_q(AVRational q, AVRational q1, AVRational q2);
+
+/**
+ * Finds the nearest value in \p q_list to \p q.
+ * @param q_list an array of rationals terminated by {0, 0}
+ * @return the index of the nearest value found in the array
+ */
+int av_find_nearest_q_idx(AVRational q, const AVRational* q_list);
+
 #endif /* AVUTIL_RATIONAL_H */