Orange Pi and USB Sound Card


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Hi all. In this topic I will show, how to make work USB sound card with  Orange Pi. I did not found similar information, so I decided to put this info into a forum.

 

At the moment, I have working mocp from root user, which able to play mp3 and online radio.

 

I am not sure if all steps are necessary. So if You know a shorter version of this, please post a reply.

 

Lets begin.

 

1. Insert USB sound card, Boot Orange Pi, and login via SSH.

Цитата

 

mocp output:

Running the server...
Trying JACK...
Trying ALSA...
Trying OSS...

FATAL_ERROR: No valid sound driver!


FATAL_ERROR: Server exited!

 


alsamixer not work without arguments ( It may print something like: cannot open mixer: No such file or directory ). But this works: alsamixer -c 1

 

2. I am not sure if this step is necessary, but I installed
apt install pulseaudio ( https://wiki.debian.org/PulseAudio )

 

3. amixer able to find usb sound card

 

4. lsmod | grep snd_usb_audio ( just making sure that snd_usb_audio is loaded )

 

5. We need to add our user ( root and other if You want ) to audio group

usermod -a -G audio root

 

 

6. Setting the default device

 

https://www.alsa-project.org/wiki/Setting_the_default_device

Цитата

 

Find your desired card with:

   cat /proc/asound/cards

and then create /etc/asound.conf with following:

   defaults.pcm.card 1
   defaults.ctl.card 1

Replace "1" with number of your card determined above.

 

and reboot the system. Then login again via SSH.

 

 

7. Type in console

modprobe snd-pcm-oss


Then add to  /etc/modules ( from new line ) snd-pcm-oss
or to /etc/rc.local

modprobe snd-pcm-oss


8. At this moment You should have /dev/dsp or /dev/dsp1
You can type

ln -s /dev/dsp1 /dev/dsp

 

to make available sound card for cmus
 ( otherwise cmus answer with error: opening audio device: No such device  ) You can also, if You want, add to /etc/rc.local ln -s /dev/dsp1 /dev/dsp
by doing this, it will add a link from /dev/dsp1 to /dev/dsp during boot process

At this moment, your mocp should play.

 

9. Next step is copy config from /usr/share/doc/moc/examples/config.example
to ~./.moc/config
and then edit this file to this proposed setting:

Цитата

OSSDevice = /dev/dsp1 ( or whatever it is, it can be also a /dev/dsp )
InputBuffer = 1024
OutputBuffer = 1024
Prebuffering = 170

 

Save and close the file.

 

Now you can run mocp and play some file or radio.
Also, from this moment alsamixer works without arguments.

 

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