ALSA not working inside snap despite including libasound2 and connecting :alsa interface

snapcraft
1

I’m building a snap for my music application that uses ALSA for audio playback.

Here are some relevant details from my yaml:

name: amphi-music
version: 1.0.0
license: Apache-2.0
summary: Music Application
source-code: https://github.com/amphi2024/music
issues: https://github.com/amphi2024/music/issues
icon: ./icon.png
description: |
  Cross-platform music player with support for syncing libraries via a self-hosted server

base: core24
confinement: strict
grade: stable

platforms:
  amd64:
  arm64:

apps:
  music:
    command: ./music
    desktop: ./amphi-music.desktop
    extensions: [gnome]
    plugs:
      - home
      - network
      - wayland
      - x11
      - desktop
      - opengl
      - pulseaudio
      - audio-playback
      - alsa
    environment:
      LD_LIBRARY_PATH: "$SNAP/lib:$SNAP/usr/lib:$SNAP/usr/lib/$CRAFT_ARCH_TRIPLET"
      ALSA_CONFIG_PATH: "$SNAP/usr/share/alsa/alsa.conf"

parts:
  ffmpeg:
    plugin: autotools
    source: https://ffmpeg.org/releases/ffmpeg-6.1.2.tar.gz
    autotools-configure-parameters:
      - --prefix=/usr
      - --libdir=/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR
      - --disable-debug
      - --disable-doc
      - --disable-static
      - --enable-gpl
      - --enable-shared
      - --disable-ffplay
      - --disable-devices
      - --enable-gnutls
      - --enable-libmp3lame
      - --enable-libvorbis
      - --enable-libdav1d
      - --enable-libopus
      - --enable-libx264
      - --enable-libx265
      - --enable-libvpx
      - --enable-libass
      - --enable-libaom
      - --enable-libfdk-aac
      - --enable-nonfree
      #- --enable-cuda-nvcc , https://codeberg.org/sameersharma2006/celluloid-snap/issues/6
      #- --enable-libnpp , https://codeberg.org/sameersharma2006/celluloid-snap/issues/6
    build-packages:
      - nasm
      - libmp3lame-dev
      - libvorbis-dev
      - libopus-dev
      - libx264-dev
      - libx265-dev
      - libnuma-dev
      - libvpx-dev
      - libdav1d-dev
      - libass-dev
      - libaom-dev
      - libfdk-aac-dev
      #- libffmpeg-nvenc-dev , https://codeberg.org/sameersharma2006/celluloid-snap/issues/6
      #- nvidia-cuda-toolkit-gcc , https://codeberg.org/sameersharma2006/celluloid-snap/issues/6
    prime:
      - -usr/share/doc
      - -usr/share/man
      - -usr/share/ffmpeg/examples
      - -usr/include
      - -usr/lib/*/pkgconfig

  mpv:
    source: https://github.com/mpv-player/mpv.git
    source-tag: 'v0.40.0'
    after: [ ffmpeg ]
    plugin: meson
    meson-parameters:
      - -Dprefix=/usr
      - -Dbuildtype=release
      - -Dx11=enabled
      - -Dwayland=enabled
      - -Dpipewire=disabled
      - -Dalsa=disabled
      - -Djack=disabled
      - -Dsndio=disabled
      - -Ddrm=enabled
      - -Dsdl2-audio=disabled
      - -Dmanpage-build=disabled
      - -Dshaderc=disabled
      - -Dbuild-date=false
    build-packages:
      - cmake
      - libjpeg-turbo8-dev
      - libxss-dev
      - libxpresent-dev
      - liblua5.2-dev
      - libplacebo-dev
      - libvdpau-dev
      - libxv-dev
      - ffmpeg
      - libdisplay-info-dev
    prime:
      - -usr/share/help
      - -usr/share/icons
      - -usr/share/applications
      - -usr/share/doc
      - -usr/share/metainfo
      - -usr/share/bash-completion
      - -usr/share/zsh
      - -usr/bin
      - -usr/include
      - -usr/lib/*/pkgconfig
  music:
    plugin: dump
    stage:
      - ./icon.png
      - ./amphi-music.desktop
      - ./music
      - ./lib
      - ./data
    source: ./files
    after: [ mpv ]

  deps:
    plugin: nil
    after: [music]
    stage-packages:
      - libass9
      - libxpresent1
      - libxss1
      - liblua5.2-0
      - libdav1d7
      - libnuma1
      - libx264-164
      - libx265-199
      - libfdk-aac2
      - libplacebo338
      - libunibreak5
      - libxv1
      - libpciaccess0
      - libdisplay-info1
      - zenity
      - libxmu6
      - libasound2
      - libasound2-data
      - libasound2-plugins
      - alsa-utils
    prime:
      - usr/lib/*/libass*
      - usr/lib/*/libXss*
      - usr/lib/*/libXpresent*
      - usr/lib/*/liblua5.2.so*
      - usr/lib/*/libdav1d*
      - usr/lib/*/libnuma*
      - usr/lib/*/libx264*
      - usr/lib/*/libx265*
      - usr/lib/*/libfdk*
      - usr/lib/*/libplacebo*
      - usr/lib/*/libunibreak*
      - usr/lib/*/libXv*
      - usr/lib/*/libpciaccess*
      - usr/lib/*/libdisplay-info*
      - usr/bin/zenity*
      - usr/lib/*/libxmu*
  • I included libasound2, libasound2-data, libasound2-plugins, and alsa-utils in the deps part’s stage-packages.
  • I set ALSA_CONFIG_PATH environment variable to $SNAP/usr/share/alsa/alsa.conf.
  • In apps.music.plugs I have connected alsa, audio-playback, and others.
  • The snap is confined with strict and based on core24.

And here is error message

ALSA lib conf.c:4579:(snd_config_update_r) Cannot access file /snap/amphi-music/x1/usr/share/alsa/alsa.conf
ALSA lib control.c:1570:(snd_ctl_open_noupdate) Invalid CTL hw:0
ALSA lib conf.c:4579:(snd_config_update_r) Cannot access file /snap/amphi-music/x1/usr/share/alsa/alsa.conf
Segmentation fault (core dumped)

I guess I haven’t included libasound2 or other ALSA-related libraries correctly. However, I’m not sure how to include them the right way, and there’s very little documentation or resources available for this. Could you please help me out? Thank you :slight_smile: