Cannot access file /usr/share/alsa/alsa.conf

[anatoly techtonik]

I am trying to pack core18 snap that needs ALSA. I added libraries, added plug, connected the interface https://docs.snapcraft.io/alsa-interface after installation, and I am still getting this error:

$ trx-audio.tx
trx (C) Copyright 2014 Mark Hills <email address hidden>
ALSA lib conf.c:3916:(snd_config_update_r) Cannot access file /usr/share/alsa/alsa.conf
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM default
snd_pcm_open: No such file or directory

I feel like :alsa interface documentation is missing something essential.

[anatoly techtonik (techtonik)]

This was the missing part.

layout:
  /usr/share/alsa:
    bind: $SNAP/usr/share/alsa

[anatoly techtonik (techtonik)]

And still is. From https://docs.snapcraft.io/alsa-interface docs.

Could also include tutorial how to build snaps for this interface.

    build-packages:
    - gcc
    - libasound2-dev
    - libopus-dev
    - libortp-dev
    stage-packages:
    - libasound2
    - libopus0
    - libortp9

[Oliver Grawert (ogra)]

there is documentation about using alsa in snaps at https://github.com/diddlesnaps/snapcraft-alsa

[anatoly techtonik (techtonik)]

What is the latency of that solution? I need ALSA because I pack https://snapcraft.io/trx-audio which is already complicated enough to wire.

[Zygmunt Krynicki (zyga)]

Dear reporter, is this issue still blocking you? I understand that the layout definition and addition packages help in this but I'd like to hear this from you directly. If there's an issue still can you please explain what it is. I'm marking the bug as incomplete until you do so.

Separately I'd like to encourage you to contribute to the documentation of the ALSA interface itself. The documentation is hosted on https://forum.snapcraft.io/t/the-alsa-interface/7766 and the documentation page is generated directly from the first comment in that thread.

I have notified my colleague Graham to keep an eye on comments to that page.

[Launchpad Janitor (janitor)]

[Expired for snapd because there has been no activity for 60 days.]

[hilaire (hilaire-fernandes)]

Hi,

On Ubuntu 19.10 I have the exact same issue when starting flightgear. Ohterwise sound is working fine with other application. It looks like something is wrong with Alsa packaging.

hilaire@PCHome:~$ flightgear --show-sound-devices
    0.00 [INFO]:general FlightGear: Version 2019.1.2
    0.00 [INFO]:general FlightGear: Build Type Dev
    0.00 [INFO]:general Built with GNU C++ version 7.4
    0.00 [INFO]:general Jenkins number/ID 0:none
    0.00 [INFO]:sound Initializing OpenAL sound manager
ALSA lib conf.c:3916:(snd_config_update_r) Cannot access file /usr/share/alsa/alsa.conf
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM default
AL lib: (EE) ALCplaybackAlsa_open: Could not open playback device 'default': No such file or directory
unknown provided by unknown

No. Device
    0.04 [ALRT]:sound Error: Default audio device not available.
0. "ALSA Default"