2022-04-10 USRP : Client for Raspberry Pi Audio Issue

1. check USB Sound Card no.

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: b1 [bcm2835 HDMI 1], device 0: bcm2835 HDMI 1 [bcm2835 HDMI 1]
Subdevices: 4/4
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
card 1: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones]
Subdevices: 4/4
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
card 2: Set [C-Media USB Headphone Set], device 0: USB Audio [USB Audio]
Subdevices: 0/1
Subdevice #0: subdevice #0

2. set alsa.conf

sudo nano /usr/share/alsa/alsa.conf
defaults.ctl.card 2 <- setting
defaults.pcm.card 2 <- setting

save file Ctrl-X ---> Y ---> Enter

3. if R2D2 accurs, modify daemon.conf

sudo nano /etc/pulse/daemon.conf
default-fragments = 5
default-fragment-size-msec = 2

save file Ctrl-X ---> Y ---> Enter

4. Reboot

sudo reboot

USRP Client for Raspberry Pi can cause R2D2 depending on
- Linux version, settings,
- and USB Sound Card
Also, there are occasional conflicts between pulseaudio and pyaudio.
Additional improvements are in progress.

I am going to release the latest SD Card Image version soon.
Once released, it is recommended that you download and use the Image File.

Thank you.

DS5QDR Heonmin Lee

Reference
- https://bbs.archlinux.org/viewtopic.php?id=185736

[SOLVED] '(snd_pcm_recover) underrun occurred' / Kernel & Hardware / Arch Linux Forums

Hi, First, sorry for my english, I'm French. When I try to launch a game using Wine and Primus (with primusrun), I get a very very bad sound and many errors in the terminal (every 200ms) like this : ALSA lib pcm.c:7843:(snd_pcm_recover) underrun occurred A

bbs.archlinux.org

- https://dvswitch.groups.io/g/main/message/3572?p=%2C%2C%2C20%2C0%2C0%2C0%3A%3Arecentpostdate%2Fsticky%2C%2CAlsa%2C20%2C1%2C0%2C30297565

Re: USB Audio on Raspberry Pi

Look in the python script, you see the sampling rate is 8000 (=8khz). I had the same problem with a cheap CM108 based usb soundcard, which only support 44,1 or 48khz. A "better" soundcard I used worked from 6khz-48 Khz. As I understand, for correct transco

dvswitch.groups.io

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