In one of the projects I'm working on, it was
necessary to have a webbrowser plugin that supported
FLAC audio, in addition to other formats such as
Ogg/Vorbis, MP3 and AAC.
The following patch, against release 3.31, adds
support for FLAC in mplayerplug-in. I've tested it
here, and it seems to work fine, although it is a bit
of a hack -- I'm not completely sure if it's correct.
If you've got any queries, please contact me: