[maemo-developers] [maemo-developers] Bluetooth headset - not really working?

[From: Brad Midgley]

Johannes

The two types of bluetooth audio are very different. You linked to a
discussion about the other type.

low-latency voice-quality mono audio uses a special transport (SCO) and
is delivered from the bluetooth chip either over the regular data
connection to the cpu (HCI) or it is connected to dedicated audio/analog
hardware (PCM). The HCI formatting and negotiation differs from chip to
chip and the linux driver is only complete for CSR chipsets.

a2dp specifies one-way high-quality, traditionally stereo, audio. It is
delivered over an L2CAP socket so linux can send and receive this audio
with any bluetooth chip that has even the most basic support.

We know what has to be done for a2dp. The SCO stuff is what I would like
to see help from Nokia on. I would hope they can help us with the HCI
interaction with the SCO transport since that gives us the most generic
control over the audio stream.

Brad

> On Tue, 2005-12-20 at 10:16 -0700, Brad Midgley wrote:
> 
>>I'm overseeing the bluetooth audio on linux project...
>>
>>Linux only supports SCO transfers for CSR chips. To use the current
>>btsco stuff, Nokia is going to have to contribute a SCO driver to the
>>kernel for whatever bluetooth chip they put in the 770.
> 
> 
> I found some further info at:
> http://thread.gmane.org/gmane.linux.bluez.devel/6713
> 
> Can anyone of the Nokia developers give us some more hints on the head
> set topic please? Can we only expect that to work when the 2006 software
> edition will be released or will the head set support be included in an
> earlier firmware update?
> 
> This missing feature is very much appreciated!
> 
> Greets, Jonek.
> 
> 
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