Re: [Bluez-users] USB-drivers

[Steven Singer <steven.singer@csr.com>]

Marcel Holtmann wrote:
> My CSR dongles only support linear PCM (2's complement) with 8 or 16 bit
> for input. See output of "hciconfig hci0 voice".

That shouldn't be the whole truth. The full list should be:

   Linear:
     16 bit with up to 7 MSBs ignored, or 8 bit
     1's complement, 2's complement or sign-magnitude
   Logarithmic:
     8 bit u-law or A-law

That's the full set of host formats allowed by the BT 1.1 HCI spec.

The sample rate is fixed at 8 kHz (as defined by the Bluetooth spec).

I wouldn't recommend sending mp3s over a SCO link. Wavs should be
fine provided they're resampled at 8 kHz, you set the voice setting
to the appropriate data format, you skip the header and you get the
rate matching right.

(Anyone else reading this thread, particularly in the archive, should
  look at the thread Rikka started called "About Scotest" for several
  important caveats from me about SCO data).

	- Steven
-- 



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