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

[Ian Walters]

Really?

I would be very interested in this.  Does this include encoding as well as 
decoding?

Any and all information would be greatly appriciated, I would like to see 
this added to Trolltech's Qtopia.

Ian.

On Thu, 21 Feb 2002 8:55am, you wrote:
> 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
> >
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