I'm replying to myself for others that may have this issue in the future. I've looked at the pulseaudio source and found a solution, It can be done with udev, here is a complete udev rules file to make it happen. https://gist.github.com/mpaolino/91c3587045fa8d1a9353b74bf102c83b Any comments/improvements are welcome. On Tue, Nov 29, 2016 at 6:20 PM, Miguel Paolino <mpaolino at gmail.com> wrote: > Hi all, > > I have several USB cards, cheap ones, all have the same vendor, product > and serial id. The cards are all assigned different names using udev rules > based on the usb port they are plugged in. > > $ cat /proc/asound/cards: > > ... > > 1 [MyCard1 ]: USB-Audio - USB Audio Device > GeneralPlus USB Audio Device at > usb-0000:00:1d.0-1.3.5, full speed > 2 [MyCard2 ]: USB-Audio - USB Audio Device > GeneralPlus USB Audio Device at > usb-0000:00:1d.0-1.3.7, full speed > > > The problem I'm having is that I cannot get a reliable config that allows > me to name and use the sources of these cards with libpulseaudio. If I use > module-udev card and source naming depends on the order they are plugged in > like: > > alsa_input.usb-GeneralPlus_USB_Audio_Device-00.analog-mono.0 > alsa_input.usb-GeneralPlus_USB_Audio_Device-00.analog-mono.2 > > The closest I could get was configuring the sources statically using > module-alsa-source naming them with the 'name' argument and using > device=hw:MyCard[1,2]. > This works but the problem is if I unplug one of the cards and I need to > plug it again and restart pulseaudio because the moment the card is > unplugged pulseaudio unloads the module. The only way to get it working > again is restarting, and if I don't plug the card back pulseaudio refuses > to start because the system is missing a card that's in the config. This > of course have the additional and most important inconvenience of > cancelling any audio capture I might be doing using the other cards. > > I tried all sorts of things with udev trying to accomplish this using only > module-udev and I failed miserably. > > Is there a way to accomplish what I want? > > I'm using: > > pulseaudio 9.0 > udev 231 > kernel 4.8.0 > > Thanks! > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20161130/1013834a/attachment.html>
