Message-ID: <000e01c5a355$e6b0a0d0$0201a8c0@NBVICTOR>
From: "Victor Shcherbatyuk" <victor@win.tue.nl>
To: <bluez-devel@lists.sourceforge.net>
References: <013e01c5a30a$b9329eb0$050aa8c0@gateway> <430351BD.7090100@xmission.com>
Subject: Re: [Bluez-devel] SBC Fixed Point for A2Dp
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Date: Wed, 17 Aug 2005 20:02:58 +0200

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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