Re: [Bluez-devel] Multiple simultaneous audio streams?

[deker <deker@slackdot.org>]

I've changed the MaxConnections setting and now I'm seeing something 
different (this must mean I'm getting closer :)

I'm using the following config/comandline to play audio:

audio.conf:
[General]
SCORouting=PCM
[Headset]
HFP=False
MaxConnections=2

~/.asoundrc:

pcm.bluetooth {
    type bluetooth
    device 00:0B:2E:D5:27:DA  
    profile auto
}
pcm.bluetooth2 {
    type bluetooth
    device 00:0B:2E:D4:EC:31
    profile auto
}

mplayer command lines:

 mplayer -ao alsa:device=bluetooth test.wav
 mplayer -ao alsa:device=bluetooth2 test.wav

Either execution of mplayer works properly as long as the other isn't 
streaming to the device. If one is already running, mplayer reports the 
following:

[AO_ALSA] alsa-lib: pcm_bluetooth.c:464:(bluetooth_hsp_hw_params) 
BT_SETCONFIGURATION failed : Input/output error(5)
[AO_ALSA] Unable to set hw-parameters: Input/output error
Could not open/initialize audio device -> no sound.
Audio: no sound
Video: no video


Exiting... (End of file)

Also, it seems that I'm losing the beginning of the sample in playback. 
I assume this is due to the delay of setting up the connection to the 
headset, but I was wondering if there was a way to avoid this.

Thanks,

-d




Johan Hedberg wrote:
> On Mon, Nov 03, 2008, deker wrote:
>   
>>  I am working on a project where it would be desirable to have audio 
>> streams going to more than one SCO audio device at a time. My quick test 
>> today of playing a WAV file with mplayer to two different devices didn't 
>> work and bluetoothd was reporting "connection refused" when I tried to 
>> get the second stream going. Once the first playback finished, I was 
>> able to then play to the second device.
>>
>> So, I suppose m question is if BlueZ supports audio to multiple SCO 
>> devices at the same time? If not, what might be involved in making it work?
>>     
>
> If you're using BlueZ 4.17 or later you'll need to add something like
> MaxConnections=2
> to the [Headset] section in /etc/bluetooth/audio.conf to be able to
> create a service level connection to more than 1 device.
>
> Johan
>
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