Passing ALSA audio onto the host?

Project help
1

Hello there, this may sound like a basic question: how do I interface ALSA inside my container?

I read this from here but I’m not sure how I can execute a custom run command on BalenaOS:

docker run --rm --device /dev/snd

I’m trying to run SvxLinux on my Pi using BalenaOS. Essentially, it tries to use the speakers and doesn’t find them in the container and exits. Outside the container, I have an external USB sound card attached to my Pi 4 (64 bit OS).

Btw, SvxLinux can only use ALSA, OSS or UDP.

And for for reference, my code is here, and it’s based on this article.

4

Hi there,
to run the docker command you can connect via ssh form the dashboard or using the CLI, as described here: https://www.balena.io/docs/learn/manage/ssh-access/.
Once you are connected, just remember to replace docker with balena. Example balena run --rm --device /dev/snd ...

6

Thank you! I managed to do this with with a docker-compose file. :slight_smile:

7

Glad to hear it works @amingilani !

9

For whoever stumbles upon this in the future, here:

services:
  svxlink:
    build: ./svxlink
    devices:
      - "/dev/snd:/dev/snd"