I know how i can play sound with reggae.
But i don't know how i can get the id3tags from mp3.

Can anybody help me.

mti = (struct MetaItem*) MediaGetPort( mediaobject, 0, MMA_MetaData );

Then you can access the mti structure and obtain the information you need.

struct MetaItem *mti is an array of meta stuff just like it is done for tooltypes and valid
until mi_Id is MMETA_BAD_ID, which is the last item in chain.

Geit

Some additional information:
1. MetaItem is defined in <classes/multimedia/metadata.h>.
2. If MetaItem contains textual information, the text is encoded in UTF-32. It can be converted to the system charset with charsets.library.
3. While id3tag.demuxer has a complete ID3v2 (2.2, 2.3, 2.4) and ID3v1 tag parser, only basic ID3v2 tags are supported.

[ Edited by Krashan 21.10.2014 - 17:46 ]

parsing metadata is an old api, please use MMM_GetMetaItem for getting metadata, for example:

DoMethod(filter, MMM_GetMetaItem, MMETA_Title, &importance, &data->title, MIBENUM_SYSTEM, 0);

True, looping over MetaItem table should be used only if one is interested in getting all available metadata. Programs reading only some predefined set, should use MMM_GetMetaItem(). For text data it takes care of charset conversion, as in rzookol's example. On the other hand, Geit's method is neither "hackish" nor obsolete, just less comfortable.