* @return found entry or NULL in case no matching entry was found in the dictionary
*/
AVDictionaryEntry *
-av_dict_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags);
+av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags);
/**
* Get number of entries in dictionary.
* @param flags flags to use when setting entries in *dst
* @note metadata is read using the AV_DICT_IGNORE_SUFFIX flag
*/
-void av_dict_copy(AVDictionary **dst, AVDictionary *src, int flags);
+void av_dict_copy(AVDictionary **dst, const AVDictionary *src, int flags);
/**
* Free all the memory allocated for an AVDictionary struct