Vorbis - Feb 2010 - Altivec optimized vorbis decoder

Hi

Is there any Altivec optimized libVorbis implementation source code out 
there ?
The only thing I'v found is that message: 
http://lists.xiph.org/pipermail/vorbis-dev/2003-October/007835.html
but the link is dead, so the source code is lost (forever ?).

I need to decode from 10 to 30 ogg files on my PS3 on the fly (files are 
already in memory, so I'm not I/O bound)
and do something with output ... but on CELL the PPU is weak, and this 
decoding alone takes 30 - 40 % of it's time that I need for other tasks.
Moving vorbis to SPU's (spurs or raw) is not a trivial task as the context 
size is large (to large for SPU in it's unmodified form as they have only 
256kb of local storage for code AND data).

Judging from the profiler and code vectorization should cut in the half the 
PPU power needed to decode vorbis, but meybe someone already done this for 
PPC's ?

Thanks for any information on that topic.

Ps. switching ogg to mp3 is not an option :)


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On 2010-02-28 12:13, Mariusz 'mx' Szaflik wrote:
> Moving vorbis to SPU's (spurs or raw) is not a trivial task as the
context
> size is large (to large for SPU in it's unmodified form as they have
only
> 256kb of local storage for code AND data).
Have you tried the Tremor/lowmem version of the Vorbis decoder? It might
fit on an SPU.

http://svn.xiph.org/branches/lowmem-branch/Tremor/

Peter Harris
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