/!\ You need to have a running LoxBerry installation with a microphone and an audio output connected. Here are some tipps and tweaks for audio with Raspberry.
You can use either the HDMI or the analog plug for audio output. Audio output should work out of the box. To test type:
mplayer /usr/share/sounds/alsa/Front_Left.wav
In case its not working check the following:
- Check if its working with ALSA directly
aplay -D plughw:ALSA,0 /usr/share/sounds/alsa/Front_Left.wav
- Volume level Adjust audio volume using:
alsamixer
- Get a list of your audio devices:
aplay -l
If there is no device. Check if you are a member of the group audio:
groups
> ... audio ...
- Check aplay with the correct audio device
aplay -D hw:<cardnum>,<devicenum> /usr/share/sounds/alsa/Front_Left.wav
where you take and (typicall 0,0 or 1,0) from the list printed by aplay -l
- Check controls
amixer controls
> numid=3,iface=MIXER,name='PCM Playback Route'
> numid=2,iface=MIXER,name='PCM Playback Switch'
> numid=1,iface=MIXER,name='PCM Playback Volume'
> numid=5,iface=PCM,name='IEC958 Playback Con Mask'
> numid=4,iface=PCM,name='IEC958 Playback Default'
- Manual set audio output to HDMI or anlog plug for HDMI:
amixer cset numid=3 2
for analog headphone plug
amixer cset numid=3 1
default for automatic
amixer cset numid=3 0
Have a look at:
- https://dbader.org/blog/crackle-free-audio-on-the-raspberry-pi-with-mpd-and-pulseaudio
- https://fedoraproject.org/wiki/How_to_debug_PulseAudio_problems
there are several tips. One is to change the time-based audio scheduling in PulseAudio. Edit:
/etc/pulse/default.pawith:
### Automatically load driver modules depending on the hardware available
.ifexists module-udev-detect.so
load-module module-udev-detect tsched=0
comment out load-module module-suspend-on-idle
Restart the Pi.
To record a file type:
arecord test.wav
Stop with CTRL+C
In case its not working check the following:
- Volume level Adjust mic volume using:
alsamixer
You may have to select the right device by F6
- Get a list of your audio input devices:
arecord -l
- In case
arecordgives an error like:
arecord: main:722: ...
Call arecord with your device
arecord --device=plughw:<device>,0 test.wav
For <device> fill in the number of or device given by arecord -l, or simply try 0,1,2...
Try to run the mic test twice in two different terminals at the same time. MPlayer was not working but aplay with -D option?
Check if pulseaudio is running.
pulseaudio --check
There should be no output - than its fine.
Still no sound? Manually configure pulseaudio to use the correct hardware: Edit /etc/pulse/defaul.pa and uncomment and adjust the lines
load-module module-alsa-sink device=hw:0,0
load-module module-alsa-source device=hw:0,0
Change hw:0,0 to your see above. Sink is the soundcard, source is the mic.