[PATCH 2/2] Document the behavior of av_metadata_get() if the tag parameter is NULL.

[Stefano Sabatini]

---
 libavformat/avformat.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 58978db..3583858 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -131,6 +131,8 @@ typedef struct AVMetadataConv AVMetadataConv;
 /**
  * Gets a metadata element with matching key.
  * @param prev Set to the previous matching element to find the next.
+ * If it is set to NULL, the first matching tag since the beginning
+ * of the metadata context will be returned.
  * @param flags Allows case as well as suffix-insensitive comparisons.
  * @return Found tag or NULL, changing key or value leads to undefined behavior.
  */
-- 
1.7.0


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