Message-ID: <432823D3.3060705@cefriel.it>
From: Luca Pizzamiglio <pizzamiglio@cefriel.it>
MIME-Version: 1.0
To: bluez-devel@lists.sourceforge.net
Subject: Re: [Bluez-devel] SCO & btsco
References: <4327D66A.1030304@cefriel.it> <43280B35.1070303@csr.com>
In-Reply-To: <43280B35.1070303@csr.com>
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Sender: bluez-devel-admin@lists.sourceforge.net
Errors-To: bluez-devel-admin@lists.sourceforge.net
Reply-To: bluez-devel@lists.sourceforge.net
Date: Wed, 14 Sep 2005 15:21:23 +0200

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Thanks, Steven.
I'm sorry for confusion I created.

with sox:

sox -t raw -r 8000 -s -w sound.raw pippo.wav

I build a transformation chain that works.

Thank you.

Cheers,
Pizza


Steven Singer wrote:
> Luca Pizzamiglio wrote:
> 
>>bt specification says that bluetooth supports three audio formats:
>>- CVSD
>>- u-law
>>- a-law
> 
> 
> That's not what the BT spec says, you need to read it more carefully.
> 
> BT supports 3 *air* formats: u-law, A-law and CVSD, however, that's
> irrelevant as far as interfacing with the chip is concerned as the
> chip will transcode to and from those formats from and to the HCI
> format (aka the input format).
> 
> BT supports the following HCI formats:
> 
>   2's complement linear
>   1's complement linear
>   sign-magnitude
>   unsigned (some devices only)
>   u-law
>   A-law
> 
> The linear formats can be 8 bit, 16 bit or 9..15 bit right aligned
> in a 16 bit word.
> 
> The default format - 0x0060 - is CVSD on the air and 16 bit 2's
> complement linear signed on the wire as the output of hciconfig
> clearly states.
> 
> Always keep the air format set to CVSD (as the two sides need to agree
> on the air format in order to be able to make a connection and most,
> if not all, Bluetooth devices are set up for CVSD). Make the HCI
> format whatever your program supports.
> 
> 	- Steven


- --
- -------------------------------------------
Luca Pizzamiglio
CEFRIEL - Embedded Systems Design Unit
Via Fucini, 2 - 20133 MILANO (ITALY)
Phone:		+39 02 23954 343
e-mail:		pizzamiglio@cefriel.it
ICQ:		5046978
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