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From: Robert Huitl <bluez-devel@huitl.de>
To: bluez-devel@lists.sourceforge.net
Date: Wed, 16 May 2007 02:21:26 +0200
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Message-Id: <200705160221.27516.bluez-devel@huitl.de>
Subject: Re: [Bluez-devel] skype and bluetooth
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On Dienstag, 15. Mai 2007, you wrote:
> On Tuesday 15 May 2007 21:22, Robert Huitl wrote:
> > Okay after some debugging I know what the problem is.
> > 2.) Offering more sampling rates than 8 kHz would be nice to have, but
> > I'm not familiar with the design philosophies around ALSA. It's probably
> > not a good idea to implement resampling in each and every sound plugin
> > like pcm_sco. Does ALSA have some resampling facilities that can be
> > plugged in between an application and a plugin? Maybe some magic lines in
> > .asoundrc?
>
> I do this with a2dp, I'm sure the same could apply to sco.
> I use an .asoundrc file which looks like this:

Thanks a lot for this configuration. I got Skype running with it, even though 
it's freezing almost always when I call the echo test service (and both input 
and output are set to headset-sco-resample). But in a few cases it actually 
worked very nicely.

However, if only input _or_ output is set to the headset device, it's quite 
stable. So recording is fine, playback is fine, but both of them at a time 
freeze Skype.

For reference, this is my .asoundrc:

pcm.headset-sco-resample {
        type plug
        slave {
                pcm "headset-sco"
                rate 8000
                format S16_LE
                channels 1
        }
}
pcm.headset-sco {
        @args [BDADDR TIMEOUT]
        @args.BDADDR {
                type string
                default "xx:xx:xx:xx:xx:xx" # Put your HS address here
        }
        @args.TIMEOUT {
                type integer
                default 6000
        }
        type        sco
        bdaddr      $BDADDR
        timeout     $TIMEOUT
}

Might be some problem with ALSA, though.

Regards,
  Robert

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