[vorbis-dev] Re: [iPAQ] Ogg Vorbis fixed-point math anyone ?

[Dan Conti]

Actually, we have a integerized version of the vorbis libraries that are
available, royalty free, with a simple attribution requirement. These
libraries are 100% C code and run faster than real time on a cirrus
7312-74mhz processor (arm core). My guess is they should run at about
20-30% cpu utilization on a strongarm/200. Monty has this same code, but
his version doesn't play b4 content real time. 

For more information, feel free to contact me off-list.

> -----Original Message-----
> From: owner-vorbis-dev at xiph.org [mailto:owner-vorbis-dev at xiph.org]On
> Behalf Of Ian Walters
> Sent: Wednesday, February 20, 2002 2:33 PM
> To: Gregor Hoffleit; ipaq at handhelds.org
> Cc: vorbis-dev at xiph.org
> Subject: [vorbis-dev] Re: [iPAQ] Ogg Vorbis fixed-point math anyone ?
> 
> 
> Yes and no.
> 
> I tried it but not seriously.  I only went as far as floating point 
> emulation, not trying to understand the algorithms and turn them to 
> fixed-point/integer.  I have been watching the ogg-vorbis 
> lists though, and 
> it would seem to be only one part of it that remains to be properly 
> integerized.  Unfortunately from the sounds of things it 
> would take someone 
> who really knew what they were doing to transform that last 
> bit.  I don't 
> remember what it was, just that when I Googled for the 
> definition what I 
> found made very little sense to me.
> 
> The emulation proved insufficient as the quality was way, 
> way, way down.  And 
> the normal floating point emulation (e.g. the automatic 
> stuff) wasn't fast 
> enough.
> 
> Ian.
> 
> On Thu, 21 Feb 2002 05:38 am, Gregor Hoffleit wrote:
> > A few months ago, there was some discussion about adding fixed-point
> > support for iPAQ's StrongARM to Ogg Vorbis (whether and how it's
> > possible, that is). Has anybody tried this yet ?
> >
> >     Gregor
> > _______________________________________________
> > Open Source Software for Compaq iPAQ Handhelds.
> > iPAQ mailing list
> > iPAQ at handhelds.org
> > http://handhelds.org/mailman/listinfo/ipaq
> > irc://irc.openprojects.net #ipaq
> 
> --- >8 ----
> List archives:  http://www.xiph.org/archives/
> Ogg project homepage: http://www.xiph.org/ogg/
> To unsubscribe from this list, send a message to 
> 'vorbis-dev-request at xiph.org'
> containing only the word 'unsubscribe' in the body.  No 
> subject is needed.
> Unsubscribe messages sent to the list will be ignored/filtered.
> 

--- >8 ----
List archives:  http://www.xiph.org/archives/
Ogg project homepage: http://www.xiph.org/ogg/
To unsubscribe from this list, send a message to 'vorbis-dev-request at xiph.org'
containing only the word 'unsubscribe' in the body.  No subject is needed.
Unsubscribe messages sent to the list will be ignored/filtered.