[vorbis-dev] vorbis on playstation 2

Segher Boessenkool segher at koffie.nl
Thu Feb 6 23:56:53 PST 2003

David Etherton wrote:
>>If the IOP goes unused otherwise, running a 3x slower Vorbis
>>decoder on the IOP is still faster :)
> It's not useful if the IOP isn't fast enough to decode in realtime.  We
> actually abuse the IOP moreso than most people -- we mix three or four 48Khz
> ADPCM streams entirely in software to avoid poaching the meager 48 sound
> voices.
> But perhaps if I drop down to 24Khz samples and get very careful with my
> cache usage it may be doable.  It should would make it an easier sell for
> the rest of the company knowing that we don't have to give up any precious
> EE cycles.

An hybrid probably works best: do the floor interpolation and
the floor*res and the DCT and the windowing and the mixing on
the IOP (all these are traditional, well-parallelizable dsp
tasks, except the floor interpolation maybe).


<p>--- >8 ----
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