From 3dd6180fc7900b0b658e9175160dfe907784da5c Mon Sep 17 00:00:00 2001
From: Anton Khirnov <wyskas@gmail.com>
Date: Mon, 5 Apr 2010 19:46:55 +0000
Subject: Add a flag to not overwrite existing tags

Patch by Anton Khirnov <wyskas gmail com>.

Originally committed as revision 22806 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/metadata.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'libavformat/metadata.c')

diff --git a/libavformat/metadata.c b/libavformat/metadata.c
index 9ff7c48a8a..0f2b5297b8 100644
--- a/libavformat/metadata.c
+++ b/libavformat/metadata.c
@@ -55,6 +55,8 @@ int av_metadata_set2(AVMetadata **pm, const char *key, const char *value, int fl
         m=*pm= av_mallocz(sizeof(*m));
 
     if(tag){
+        if (flags & AV_METADATA_DONT_OVERWRITE)
+            return 0;
         av_free(tag->value);
         av_free(tag->key);
         *tag= m->elems[--m->count];
-- 
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