[vorbis-dev] vorbis on playstation 2

Brad BARCLAY bbarclay at jsyncmanager.org
Wed Feb 5 15:28:43 PST 2003

On Wed, 5 Feb 2003 12:58:44 -0800, David Etherton wrote:

Hi David:

>I'm interested in getting vorbis up and running on the PlayStation 2.  I'm
>an official developer, not a ps2 linux developer, but the issues should be
>roughly the same.  I've gotten the code to compile but our setup
>(intentionally) doesn't have libm so I'm seeing references to several
>double-precision math functions.

        I'm the guy who did the "official" port of Ogg Vorbis for the
PS2 Linux platform.  I won't pretend to be a PS2 development expert,
but I'd be happy to share what information I've collected.

>I took a brief look at Tremor, but the PS2 has more floating-point
>performance than integer performance, and it has a separate vector unit that
>could run tasks in parallel with the main CPU.  The IOP on the PS2 is a MIPS
>3000 at 36 Mhz, and I've been told that there's just not enough horsepower
>there so I'm sticking with floating-point for now.

        The Vorbis code is probably the way to go, using one (or both)
vector units to handle the most-called transformation functions.  I
looked into all of this about 6 months ago, running the code through a
profiler to determine which methods the code spent the most time in.

        I've actually been searching through my records recently
looking for this information (your the second official PS2 developer to
ask about this this week (the other one was via private e-mail)).  If
you'd like, when I find my notes I'd be happy to send them your way (I
haven't worked on this stuff for months, because there didn't appear to
be much -- if any -- interest in this within either the Vorbis or PS2
communities, besides which I have my own Open Source project I
administer (the jSyncManager -- ref: http://www.jsyncmanager.org), and
haven't had alot of time to work on optimizations and such).

        As well, if you're interested in working on this in a
completely Open Source framework, I can put you in touch with that
"other PS2 developer" (if they're likewise interested), and we can all
pool our resources.


>From the OS/2 WARP v4.5 Desktop of Brad BARCLAY.
E-Mail:  yaztromo at acm.org  Web:  http://www.jsyncmanager.org

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