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Backport virtio sound driver

Fixed

Description

virtio-snd is a driver for virtual sound device specified in https://github.com/oasis-tcs/virtio-spec/blob/master/virtio-sound.tex

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Walt Miner 
August 17, 2021 at 9:48 PM

Close for LL 12.0.0

George Kiagiadakis 
April 29, 2021 at 12:28 PM

Older versions of PipeWire struggle with virtual sound cards. Newer versions (what you will find in AGL master) can cope, but they need configuration tweaking. Specifically, you will need to increase the period-size and headroom properties of the alsa sink, as described in https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/469

 

Vasyl Vavrychuk 
April 29, 2021 at 10:18 AM

in scope of this ticket I am adding to AGL driver for virtio-snd virtual sound card.

Playback via this driver works well using aplay but it fails when using AGL mediaplayer UI.

Here are errors when driver is used on AGL Koi

sh-5.0# journalctl -u pipewire@1001.service -f -- Logs begin at Mon 2020-06-29 03:06:42 UTC. -- Apr 29 08:43:57 virtio-aarch64 systemd[1]: Started Multimedia Service for user 1001. Apr 29 08:43:58 virtio-aarch64 pipewire[556]: [W][000000036.349378][connection.c:150 connection_ensure_size()] connection 0x55747df820: resize buffer to 29208 4112 65536 Apr 29 08:43:58 virtio-aarch64 pipewire[558]: [W][000000036.359200][connection.c:150 connection_ensure_size()] connection 0x559483db80: resize buffer to 32768 2552 65536 Apr 29 08:46:09 virtio-aarch64 pipewire[556]: [W][000000167.328923][alsa-pcm.c:469 spa_alsa_set_format()] alsa-pcm hardware does double buffering, changing period_size to 512 Apr 29 08:46:09 virtio-aarch64 pipewire[556]: [E][000000167.364205][alsa-pcm.c:572 alsa_recover()] alsa-pcm 0x55747fcdb8: xrun of 558 usec 26 0.000000 Apr 29 08:46:09 virtio-aarch64 pipewire[556]: ALSA lib ../../../alsa-lib-1.2.1.2/src/pcm/pcm.c:8529:(snd_pcm_recover) cannot recovery from underrun, prepare failed: Invalid argument Apr 29 08:46:09 virtio-aarch64 pipewire[556]: [E][000000167.369599][alsa-pcm.c:588 alsa_recover()] alsa-pcm 0x55747fcdb8: snd_pcm_recover error: Invalid argument

Maybe you have some idea?

I plan to sync my AGL to latest master and retest with it too.

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Created April 20, 2021 at 7:54 PM
Updated August 17, 2021 at 9:48 PM
Resolved May 5, 2021 at 8:17 PM

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