[pulseaudio-discuss] How to launch pulseaudio on embedded system

[Tanu Kaskinen]

On Thu, 2014-09-04 at 12:17 +0200, DIEHCO R&D wrote:
> Le 04/09/2014 11:32, Tanu Kaskinen a écrit :
> > On Tue, 2014-09-02 at 15:17 +0200, DIEHCO R&D wrote:
> >> Le 02/09/2014 12:35, Tanu Kaskinen a écrit :
> >>> On Tue, 2014-09-02 at 11:24 +0200, DIEHCO R&D wrote:
> >>>> Le 02/09/2014 10:57, Tanu Kaskinen a écrit :
> >>>>>>>> (...)
> >>>>>>>> I: [pulseaudio] module-udev-detect.c: Found 0 cards.
> >>>>>>> The debug logs before this line should tell why there weren't any sound
> >>>>>>> cards found.
> >>>>>> module-udev-detect.so found. I don't see if there is problem in log below.
> >>>>> Ok, so according to udev there are no sound devices. What does "ls
> >>>>> -l /dev/snd" print?
> >>>>>
> >>>> root at eukrea-cpuimx25:~# ls -l /dev/snd
> >>>> crw-rw----    1 root     root      116,   0 Sep  2 09:13 controlC0
> >>>> crw-rw----    1 root     root      116,  24 Sep  2 09:13 pcmC0D0c
> >>>> crw-rw----    1 root     root      116,  16 Sep  2 09:13 pcmC0D0p
> >>>> crw-rw----    1 root     root      116,   1 Sep  2 09:13 seq
> >>>> crw-rw----    1 root     root      116,  33 Sep  2 09:13 timer
> >>> Hmm, pulseaudio probably can't use these devices, because they are
> >>> accessible only to root and pulseaudio runs under the "pulse" user, so
> >>> modifying the access rights is required, but I think the log indicates
> >>> that pulseaudio doesn't even try, because according to udev there are no
> >>> sound cards.
> >>>
> >>> What does "udevadm info /dev/snd/controlC0" print?
> >> root at eukrea-cpuimx25:~# udevadm info /dev/snd/controlC0
> >> missing option
> >> root at eukrea-cpuimx25:~# udevadm info --query=all --name=/dev/snd/controlC0
> >> P: /devices/platform/soc-audio/sound/card0/controlC0
> >> N: snd/controlC0
> >> E: DEVNAME=/dev/snd/controlC0
> >> E: DEVPATH=/devices/platform/soc-audio/sound/card0/controlC0
> >> E: MAJOR=116
> >> E: MINOR=0
> >> E: SUBSYSTEM=sound
> > Looks good to me. Can you also paste the output of
> >
> >      udevadm info --query=all /sys/devices/platform/soc-audio/sound/card0
> >
> > If that also looks good, then I'm out of ideas.
> root at eukrea-cpuimx25:~# udevadm info --query=all 
> --path=/sys/devices/platform/soc-audio/sound/card0
> P: /devices/platform/soc-audio/sound/card0
> E: DEVPATH=/devices/platform/soc-audio/sound/card0
> E: SUBSYSTEM=sound
> I don't know it is good...

It has SUBSYSTEM=sound, so PulseAudio should pick it up.

> Maybe I could use module-alsa-source or module-alsa-source ? I did some 
> try without success because of wrong argument.

Yes, that's an option if udev doesn't work. Instead of the sink/source
modules, though, I recommend using module-alsa-card:

    load-module module-alsa-card device_id=cpuimxaudio

-- 
Tanu