Re: [Bluez-devel] SBC Fixed Point for A2Dp

["Roberto" <rlr@bitween.com>]

thanks for the update my main poblem is that working with Mobile at around
100,10 Mhz it is quite slow this ckind of calculation , the one that I have
(sbc.c floating point) is totally slow so I hope you will implement oen a
little bit better and then I can improve on mobile, if you have time to send
me a version so I can test it on these days because i'm not in vacation :)

Ciao Roberto

----- Original Message ----- 
From: "Victor Shcherbatyuk" <victor@win.tue.nl>
To: <bluez-devel@lists.sourceforge.net>
Sent: Wednesday, August 17, 2005 8:02 PM
Subject: Re: [Bluez-devel] SBC Fixed Point for A2Dp


> It will be out there by the end of the week, we already have ARM specific
> 64-bit precise version which runs within around 30 MIPS and does not sound
> noisy, I'm finishing general 64-bit thing (uses long long for
multiplication
> result) to make it complete and currently integrating it into the a2dp
code.
> I'm on vacation now, so the progress is slow...
>
> Victor.
>
> ----- Original Message ----- 
> From: "Brad Midgley" <bmidgley@xmission.com>
> To: <bluez-devel@lists.sourceforge.net>
> Sent: Wednesday, August 17, 2005 17:03
> Subject: Re: [Bluez-devel] SBC Fixed Point for A2Dp
>
>
> > Roberto
> >
> >> I have read some transcoding to SBC fixed point somewhere , do you know
> >> where become available ? We are working on a mobile version of A2DP
with
> >> headphones for Symbian and we would like to port this part of code to
> >> mobile and deliver the library under LGPL
> >
> > I hope you are able to help us with this. We currently have no
> > implementation. Victor Shcherbatyuk has been tinkering with fixed point
> > but was getting noisy audio last I heard and has not contributed
anything
> > yet.
> >
> > If you look in sbc/sbc.h, you'll see some fixed point functions like
> > fxmult and conversion functions. Currently, the precision is set to 20
> > bits. This is probably not enough, but after you change it to get more
> > precision, the fixed point tables in sbc_tables_f.h need to be
> > regenerated; build gen_fixed.c by hand and run
> >
> > ./gen_fixed > sbc_tables_f.h
> >
> > to do that.
> >
> > Can I help in any other way?
> >
> > thanks!
> > Brad
> >
> >
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