@@ -76,6 +76,17 @@ int av_dict_set(AVDictionary **pm, const char *key, const char *value,
if (!(flags & AV_DICT_MULTIKEY)) {
tag = av_dict_get(m, key, NULL, flags);
+ } else if (flags & AV_DICT_DEDUP) {
+ while ((tag = av_dict_get(m, key, NULL, flags))) {
+ if ((!value && !tag->value) ||
+ (value && tag->value && !strcmp(value, tag->value))) {
+ if (flags & AV_DICT_DONT_STRDUP_KEY)
+ av_free(key);
+ if (flags & AV_DICT_DONT_STRDUP_VAL)
+ av_free(value);
+ return 0;
+ }
+ }
}
if (flags & AV_DICT_DONT_STRDUP_KEY)
copy_key = (void *)key;
@@ -75,6 +75,7 @@
#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_MULTIKEY 64 /**< Allow to store several equal keys in the dictionary */
+#define AV_DICT_DEDUP 128 /**< If inserting a value that already exists for a key, do nothing. Only relevant with AV_DICT_MULTIKEY. */
typedef struct AVDictionaryEntry {
char *key;