Ogg Vorbis Decoder

[Joerg Dietrich]

Hello,

attached is the result of another holiday season with the family,
sometimes you need to get out ;)
It is a working Ogg Vorbis Decoder. I have written it by myself based on
the codec framework of Stuart Dalton and of course idsoftware's work.
It uses libvorbisfile, libvorbis and libogg which are under a BSD
license. The Decoder uses the High Level API of vorbis : libvorbisfile.
This adds a little bit of overhead but only to the loading times.
While in game the streaming background music needs some CPU-time too.
Only one minor addition to existing code was neccessary :
The struct snd_stream_t in client/snd_codec.h now contains an additional
field "length" with the filesize of the compressed soundfile.
This length is obtained in S_CodecutilOpen() in client/snd_codec.c
from the function FS_FOpenFileRead().
I have tested this patch only on Linux on x86_32.
For this I have oggified the Demo-PAK and the programm itself :
encoded all WAVs as OGGs and replaced all calls to *.wav to *.ogg .
The resulting PAK is some 18 % smaller than the original.
The program runs flawless, there is no stutter in the sounds or the
background music. A framerate drop is not noticeable.
In the Makefile I have only added support for the Ogg Vorbis Decoder for
Linux. The maintainers of the other ports must define USE_CODEC_VORBIS
in the CFLAGS and link with libvorbisfile, libvorbis and libogg when
they want Ogg Vorbis. The whole decoder is optional. If you don't want
Ogg Vorbis support, undefine USE_CODEC_VORBIS in the Makefile.

Happy New Year!

Joerg
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