Audio device not detected on Linux with SDL2_jll

[dalum]

Cross-ref: JuliaMultimedia/SimpleDirectMediaLayer.jl#51

Using SDL2_jll on Linux (latest Manjaro) together with SDL2_mixer_jll, no audio device is detected. If I manually copy over the system-provided libSDL2-2.0.so.0.12.0 into the artifacts directory for SDL2_jll, then everything works fine, so I assume something is up with the compiled .so in the JLL.

Would appreciate if someone could help resolve this. ☺️

[aviks]

Can you do ldd against the system and the artifact .so's and report the results?

[dalum]

Artifact:

	linux-vdso.so.1 (0x00007ffe2fff9000)
	libm.so.6 => /usr/lib/libm.so.6 (0x00007f1826f48000)
	libiconv.so.2 => not found
	libdl.so.2 => /usr/lib/libdl.so.2 (0x00007f1826f42000)
	libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007f1826f20000)
	librt.so.1 => /usr/lib/librt.so.1 (0x00007f1826f15000)
	libc.so.6 => /usr/lib/libc.so.6 (0x00007f1826d4e000)
	/usr/lib64/ld-linux-x86-64.so.2 (0x00007f1827446000)

System:

	linux-vdso.so.1 (0x00007ffcde3f6000)
	libm.so.6 => /usr/lib/libm.so.6 (0x00007f1a09fb9000)
	libdl.so.2 => /usr/lib/libdl.so.2 (0x00007f1a09fb3000)
	libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007f1a09f91000)
	libc.so.6 => /usr/lib/libc.so.6 (0x00007f1a09dca000)
	/usr/lib64/ld-linux-x86-64.so.2 (0x00007f1a0a2b2000)

[staticfloat]

@dalum I just merged a new SDL2_jll that relies on alsa_jll to get Audio output support on Linux. Now that that new version of SDL2_jll has been merged into the registry, can you update and try again to see if your sound works?

[dalum]

Unfortunately, it doesn't work ☹️

I get the following errors, though:

ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /workspace/destdir/share/alsa/alsa.conf
ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /workspace/destdir/share/alsa/alsa.conf
ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM default
ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /workspace/destdir/share/alsa/alsa.conf
ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /workspace/destdir/share/alsa/alsa.conf
ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM default
ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /workspace/destdir/share/alsa/alsa.conf
ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /workspace/destdir/share/alsa/alsa.conf

[staticfloat]

Do you know what sound system your custom SDL library is using?

…

On Tue, Aug 25, 2020 at 15:17 Sakse ***@***.***> wrote: Unfortunately, it doesn't work ☹️ I get the following errors, though: ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /workspace/destdir/share/alsa/alsa.conf ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /workspace/destdir/share/alsa/alsa.conf ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM default ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /workspace/destdir/share/alsa/alsa.conf ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /workspace/destdir/share/alsa/alsa.conf ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM default ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /workspace/destdir/share/alsa/alsa.conf ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /workspace/destdir/share/alsa/alsa.conf — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#1432 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAA762GJK2PNOEQU5VBJ2FDSCQZ6FANCNFSM4PYZZUAQ> .

[dalum]

I'm not 100% certain, but it has both libpulse, alsa-lib and jack as optional dependencies, so my guess would be that it's configured to use whichever one is available. My system has PulseAudio running with an ALSA backend.

[staticfloat]

Hmm, then ALSA should work, most likely it's buggered because the configuration file location needs to be set. What happens if you set export ALSA_CONFIG_DIR=/etc before running Julia?

[dalum]

Hmm, then ALSA should work, most likely it's buggered because the configuration file location needs to be set. What happens if you set export ALSA_CONFIG_DIR=/etc before running Julia?

ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /etc/alsa.conf
ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /etc/alsa.conf
ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM default
ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /etc/alsa.conf
ALSA lib conf.c:4048:(snd_config_update_r) Cannot access file /etc/alsa.conf

But /etc/alsa.conf also doesn't exist. Instead there is:

> ls /etc/alsa/conf.d/
10-samplerate.conf@    50-oss.conf@         60-upmix.conf@
10-speexrate.conf@     50-pipewire.conf@    60-vdownmix.conf@
50-arcam-av-ctl.conf@  50-pulseaudio.conf@  98-usb-stream.conf@
50-jack.conf@          60-speex.conf@       99-pulseaudio-default.conf@

[dalum]

What does "work" however, is to set ALSA_CONFIG_DIR to /usr/share/alsa. But in that case I get a new error:

ALSA lib dlmisc.c:285:(snd_dlobj_cache_get0) Cannot open shared library /workspace/destdir/lib/alsa-lib/libasound_module_pcm_pulse.so ((null): /workspace/destdir/lib/alsa-lib/libasound_module_pcm_pulse.so: cannot open shared object file: No such file or directory)

It looks like the builder ends up hardcoding a few too many paths from the build-agent?

[giordano]

maybe alsa_jll should set ALSA_CONFIG_DIR to the its own conf directory, if the variables isn't set already?

ALSA lib dlmisc.c:285:(snd_dlobj_cache_get0) Cannot open shared library /workspace/destdir/lib/alsa-lib/libasound_module_pcm_pulse.so ((null): /workspace/destdir/lib/alsa-lib/libasound_module_pcm_pulse.so: cannot open shared object file: No such file or directory)

Interesting, we don't have lib/alsa-lib/libasound_module_pcm_pulse.so in alsa_jll, nor any lib/alsa-lib directory at all 😕

[staticfloat]

That looks to me like your alsa config is telling it to use a pulseaudio plugin that it can't find.

Hmmm. There is a default alsa config embedded within the artifact, isn't there? Let's try just using that.

Can you set ALSA_CONFIG_DIR=$(julia -e 'using alsa_jll; println(alsa_jll.artifact_dir)')/share/alsa and see if that works?

[dalum]

I get the exact same error,

ALSA lib dlmisc.c:285:(snd_dlobj_cache_get0) Cannot open shared library /workspace/destdir/lib/alsa-lib/libasound_module_pcm_pulse.so ((null): /workspace/destdir/lib/alsa-lib/libasound_module_pcm_pulse.so: cannot open shared object file: No such file or directory)