These are proposed bounty projects.
5.1 Sound encoding in Ogg Vorbis.
There are two steps here. Simple coupling and lowpass for the .1 channel, and a full set of tuned modes. They should be separate bounties.
Xiph Quicktime Plugin
You have to write a Quicktime Plugin for the Ogg container and the Xiph Codec Family. qtcomponents provides support for Ogg Vorbis and MNG. This could be used as start. Xiph Quicktime Plugin has to support endocding/decoding for:
- Ogg Media container
- Support for Chained Ogg Streams
- Support for Icecast Streams (sending is optional)
- Support for Xiph Codec Family: Vorbis, Theora, FLAC, Speex, Writ
iTunes encoding support
Encoding support in Apple's iTunes program for Vorbis and FLAC. Speex optional.
FLAC support in libfishsound
libfishsound currently only supports Ogg Vorbis and Ogg Speex to make it support all Xiph audio codecs you have to add FLAC support.