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sm0svx / svxlink

Advanced repeater system software with EchoLink support for Linux including a GUI, Qtel - the Qt EchoLink client
http://svxlink.org/
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Stereo output #128

Closed ajorg closed 9 years ago

ajorg commented 9 years ago

The ARS Repeaters USB EchoLink adapter has a VOX circuit that only triggers properly on stereo output. svxlink only supports mono output. On Windows EchoLink it's not a problem, because Windows copies mono output to all channels by default. Linux doesn't do this.

I've worked around the issue by writing an ALSA config that routes channel 0 to both 0 and 1, but it was hard to discover how to do this. It would be easier to work around if svxlink supported audio output to multiple channels / stereo.

sm0svx commented 9 years ago

Linux is not to blame for this. It's just that SvxLink is hard coded to always open the audio device in stereo mode. It would probably be quite simple to add a new config variable, CARD_CHANNELS, that can be set to 1 to open the audio device in mono mode. That will send the audio to both left and right connector.

ajorg commented 9 years ago

Sounds good. Do you want to paste me a patch to try?

sm0svx commented 9 years ago

The CARD_CHANNELS config variable is now available in latest git master.

ajorg commented 9 years ago

Excellent! I'll give it a try this weekend.

ajorg commented 9 years ago

I backported the patch to 14.08 and it seems to work nicely there. I'm rebuilding from HEAD now as well.

sm0svx commented 9 years ago

OK, sounds good. Closing issue.