+ * Read an ID3v2 tag, including supported extra metadata
+ * @param extra_meta If not NULL, extra metadata is parsed into a list of
+ * ID3v2ExtraMeta structs and *extra_meta points to the head of the list
+ */
+void ff_id3v2_read(AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta);
+
+/**
+ * Initialize an ID3v2 tag.
+ */
+void ff_id3v2_start(ID3v2EncContext *id3, AVIOContext *pb, int id3v2_version,
+ const char *magic);
+
+/**
+ * Convert and write all global metadata from s into an ID3v2 tag.
+ */
+int ff_id3v2_write_metadata(AVFormatContext *s, ID3v2EncContext *id3);
+
+/**
+ * Write an attached picture from pkt into an ID3v2 tag.
+ */
+int ff_id3v2_write_apic(AVFormatContext *s, ID3v2EncContext *id3, AVPacket *pkt);
+
+/**
+ * Finalize an opened ID3v2 tag.
+ */
+void ff_id3v2_finish(ID3v2EncContext *id3, AVIOContext *pb);
+
+/**
+ * Write an ID3v2 tag containing all global metadata from s.
+ * @param id3v2_version Subversion of ID3v2; supported values are 3 and 4
+ * @param magic magic bytes to identify the header
+ * If in doubt, use ID3v2_DEFAULT_MAGIC.
+ */
+int ff_id3v2_write_simple(struct AVFormatContext *s, int id3v2_version, const char *magic);
+
+/**
+ * Free memory allocated parsing special (non-text) metadata.
+ * @param extra_meta Pointer to a pointer to the head of a ID3v2ExtraMeta list, *extra_meta is set to NULL.