[FFmpeg-devel] [PATCH 1/4] av_dict_set: add fag to allow NULL values

[Michael Niedermayer]

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
---
 libavutil/dict.c |    2 +-
 libavutil/dict.h |    2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavutil/dict.c b/libavutil/dict.c
index 3a0e84c..f965492 100644
--- a/libavutil/dict.c
+++ b/libavutil/dict.c
@@ -84,7 +84,7 @@ int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags
         } else
             return AVERROR(ENOMEM);
     }
-    if (value) {
+    if (value || (flags & AV_DICT_ALLOW_NULLVAL)) {
         if (flags & AV_DICT_DONT_STRDUP_KEY) {
             m->elems[m->count].key = (char*)(intptr_t)key;
         } else
diff --git a/libavutil/dict.h b/libavutil/dict.h
index 38f03a4..944d932 100644
--- a/libavutil/dict.h
+++ b/libavutil/dict.h
@@ -74,6 +74,8 @@
 #define AV_DICT_APPEND         32   /**< If the entry already exists, append to it.  Note that no
                                       delimiter is added, the strings are simply concatenated. */
 
+#define AV_DICT_ALLOW_NULLVAL 65536 /**< Allow keys without value */
+
 typedef struct AVDictionaryEntry {
     char *key;
     char *value;
-- 
1.7.9.5