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I am working on adding album art support for FLAC and Ogg files. FLAC looks straightfoward, but there is a design problem with Ogg.

https://wiki.xiph.org/VorbisComment#Cover_art

The struct containing the image and associated data is base64 encoded. I can't just set id3→albumart.pos to a location in the file like all other supported album art formats (and FLAC). Obivously I could allocate memory for the decoded base64 data, but it would have to be deallocated later to prevent a leak.

On IRC, nick_p suggested: "how about adding a new id3 struct element id3→albumart.base64_encoded=true and decoding it when needed on the fly?" This sounds like a good idea, with one issue: it's not the album art alone that is base64 encoded, but the data struct described here:

http://flac.sourceforge.net/format.html#metadata_block_picture

I can test to see if I can parse the beginning of the base64 block, then set the pos pointer to the middle of of the block (with the id3 struct addition) and see if it will still decode.