[Bluez-users] Plantronics Explorer 350 and bluetooth-alsa

[Bluez-users] Plantronics Explorer 350 and bluetooth-alsa

[Crni Gorac]

Am trying to utilize my Plantronics Explorer 350 headset with Skype on
my Slackware 12.0 installation.  I first provided that hcid and sdpd
are started upon system boot (is any other daemon needed?), and the
compiled current CVS versions of sbc and plugz acoording to
instructions from http://bluetooth-alsa.sourceforge.net/build.html.
Then I created /etc/asound.conf with following contents (given MAC is
of my headset, obtained from hcitool scan output):

###
pcm.headset {
        @args [BDADDR TIMEOUT]

        # The Bluetooth device address for target headset, used for
Audio Gateway (PC) initiated connections
        # Please note that this value is ignored when the connection
is Headset initiated
        @args.BDADDR {
                type string
                default "00:03:89:F5:FB:F6"
        }

        # This value represents how long we will try to reach the
headset, until we give up.
        # Value is in milliseconds
        @args.TIMEOUT {
                type integer
                default 6000
        }

        type        sco
        bdaddr      $BDADDR
        timeout     $TIMEOUT
}

ctl.headset {
        type sco
}
###

Furhter, I started headsetd manually, and am not trying to have
something played on headset trough:
  mplayer -ao alsa:device=headset /opt/Skype/sounds/CallRingingIn.wav

However, I'm receiving following error reported:
alsa-lib: pcm_sco.c:277:(sco_headset_hw_params) Unable to set number
of SCO buffers : please upgrade your Kernel !
alsa-init: unable to set hw-parameters: Invalid argument
Could not open/initialize audio device -> no sound.

Is this because I haven't applied the sco-flowcontrol kernel patch
from plugz/patches directory?  But I'm running latest 2.6.22.1 kernel,
and an error is reported on one of kernel source files when the patch
applied against this kernel (and - what's the status of this patch
anyway, is it going to be included in stock kernel soon or not?)...
Further - do I need CONFIG_BT_SCO option enabled in kernel or not?

Thanks.

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Re: [Bluez-users] Plantronics Explorer 350 and bluetooth-alsa

[Crni Gorac]

To reply to my own questions from previous posting:

1. It is absolutely necessary to apply sco-flowcontrol kernel patch in
order to have Bluetooth headsets supported properly.  The patch
updated for current (2.6.22.1) kernel could be found here:
http://gentoo-wiki.com/HOWTO_use_a_bluetooth_headset, link is under
"Step 2" (bu the way, the whole thing with this patch really sucks, it
should be pushed upstream into the kernel ASAP).

2. Also, option "CONFIG_BT_SCO" must be enabled in kernel in order to
have Bluetooth headsets working properly.

So, now I have my headset working fine (am able to make a recording
using "arecord -D plug:headset test.wav", and play it back using
"aplay -D plug:headset test.wav"); on the other side, Skype seems to
have its own issues in actually using ALSA, but that's another
story...

HTH.

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