avpacket: add pack/unpack functions for AVDictionary

These functions are intended for use with side_data which comes in an
AVPacket.

Signed-off-by: Ben Boeckel <mathstuf@gmail.com>
Reviewed-by: wm4
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 18 insertions, 0 deletions

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 5239bd76f9..68bb1154ae 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -3587,6 +3587,24 @@ int av_packet_merge_side_data(AVPacket *pkt);
 
 int av_packet_split_side_data(AVPacket *pkt);
 
+/**
+ * Pack a dictionary for use in side_data.
+ *
+ * @param dict The dictionary to pack.
+ * @param size pointer to store the size of the returned data
+ * @return pointer to data if successful, NULL otherwise
+ */
+uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
+/**
+ * Unpack a dictionary from side_data.
+ *
+ * @param data data from side_data
+ * @param size size of the data
+ * @param dict the metadata storage dictionary
+ * @return 0 on success, < 0 on failure
+ */
+int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
+
 
 /**
  * Convenience function to free all the side data stored.