ff_id3v2_read_dict  716 libavformat/hls.c     ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta);
ff_id3v2_read_dict  106 libavformat/id3v2.h void ff_id3v2_read_dict(AVIOContext *pb, AVDictionary **metadata, const char *magic, ID3v2ExtraMeta **extra_meta);