[Bluez-devel] SCO & btsco

[Luca Pizzamiglio <pizzamiglio@cefriel.it>]

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Hi to all.

I'm using btsco with a headset and it works very well.
Now I'm trying to record audio from another bt device (es. a phone):
using socket SCO interface I read data and I write it in a file (sound.raw);
I'm trying to understand what audio formats I receive.

bt specification says that bluetooth supports three audio formats:
- - CVSD
- - u-law
- - a-law

hciconfig hci0 voice command reports:

hci0:   Type: USB
        BD Address: 00:09:DD:10:4C:C6 ACL MTU: 192:8 SCO MTU: 64:8
        Voice setting: 0x0060 (Default Condition)
        Input Coding: Linear
        Input Data Format: 2's complement
        Input Sample Size: 16 bit
        # of bits padding at MSB: 0
        Air Coding Format: CVSD

I see from btsco sources that btsco support only mu-law format (it is a
comment), but the code check if voice setting is equal to 0x0060 (CVSD).
So, btsco support CVSD? There's a CVSD codec in btsco source code or I
have to implement a Bluez CVSD codec?

Cheers,
Pizza

- -------------------------------------------
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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