[Bluez-devel] SBC Fixed Point for A2Dp

[Bluez-devel] SBC Fixed Point for A2Dp

[Roberto LA RAGIONE]

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Dear All,

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

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

[Roberto LA RAGIONE]

where I can get the latest version ? Thanks Roberto

----- Original Message ----- 
From: "Brad Midgley" <bmidgley@xmission.com>
To: <bluez-devel@lists.sourceforge.net>
Sent: Wednesday, August 17, 2005 5:03 PM
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
>
>
> -------------------------------------------------------
> SF.Net email is Sponsored by the Better Software Conference & EXPO
> September 19-22, 2005 * San Francisco, CA * Development Lifecycle
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> https://lists.sourceforge.net/lists/listinfo/bluez-devel
>



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

[Brad Midgley]

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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September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
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Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
_______________________________________________
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Re: [Bluez-devel] SBC Fixed Point for A2Dp

[Brad Midgley]

Roberto

> where I can get the latest version ? Thanks Roberto

Get it from cvs. See

http://bluetooth-alsa.sourceforge.net/

for details on downloading and building.

Brad


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September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
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Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
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Re: [Bluez-devel] SBC Fixed Point for A2Dp

[Victor Shcherbatyuk]

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
>
>
> -------------------------------------------------------
> SF.Net email is Sponsored by the Better Software Conference & EXPO
> September 19-22, 2005 * San Francisco, CA * Development Lifecycle 
> Practices
> Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA
> Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
> _______________________________________________
> Bluez-devel mailing list
> Bluez-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bluez-devel 



-------------------------------------------------------
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September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
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Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
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Re: [Bluez-devel] SBC Fixed Point for A2Dp

[Roberto]

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
> >
> >
> > -------------------------------------------------------
> > SF.Net email is Sponsored by the Better Software Conference & EXPO
> > September 19-22, 2005 * San Francisco, CA * Development Lifecycle
> > Practices
> > Agile & Plan-Driven Development * Managing Projects & Teams * Testing &
QA
> > Security * Process Improvement & Measurement *
http://www.sqe.com/bsce5sf
> > _______________________________________________
> > Bluez-devel mailing list
> > Bluez-devel@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/bluez-devel
>
>
>
> -------------------------------------------------------
> SF.Net email is Sponsored by the Better Software Conference & EXPO
> September 19-22, 2005 * San Francisco, CA * Development Lifecycle
Practices
> Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA
> Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
> _______________________________________________
> Bluez-devel mailing list
> Bluez-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bluez-devel
>



-------------------------------------------------------
SF.Net email is Sponsored by the Better Software Conference & EXPO
September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA
Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
_______________________________________________
Bluez-devel mailing list
Bluez-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bluez-devel