[PD] alsa crashing on recent Pi OS

[IOhannes m zmoelnig]

On 12/4/23 21:23, Yann Seznec wrote:
> 
> 
> I’ll answer both of these questions at once…to be more clear, the most 
> obvious test of the Pi issues I was having is to launch 
> “humanCaller_test.pd” from this project: 
> https://github.com/yannseznec/humanCall 
> <https://github.com/yannseznec/humanCall>
> 
> It is a granular patch that will just play a stream of grains on startup.
> 
> When I was encountering issues, this patch would stop working after 
> somewhere between 30-90 seconds, and print many instances of the error 
> “restart alsa output alsa xrun recovery apparently failed”.
> 
> I am no longer having this issue, after compiling Pd 0.54.1 myself on 
> the 32 bit Pi OS 11.

since I was just playing along with an RPi4 i thought i'd give it a try.



hardware: Raspberry Pi 4 (Model B, 4GB RAM; iirc!)
  using the onboard soundcard
operating system: IEMberry
graphics: running without monitors, but with a full Desktop connected to 
via VNC
Pd: Pd-0.53-1, as packaged
sound: ALSA

IEMberry is our in-house RPi4 distribution, it's basically a Raspberry 
Pi OS (32bit) with loads of audio and development tools preinstalled.
   https://iemberry.iem.at/
i'm using iemberry11.20231017 (as can be currently downloaded on the 
webpage), which is based on Raspberry Pi OS "Bullseye" 11 (the "with 
desktop and recommended software" flavour).
The image was generated Mid-October, so it obviously did *not* use 
"Raspberry Pi OS (Legacy)" as can be found on the RPi homepage right 
now, as the latter was released 2023-12-05. Instead, the base image was 
the last release of Rasbian available back then, which turns out to be 
have been released 2023-05-03).

IEMberry provides only very few packages by itself, and instead relies 
on the Debian packages. It also has Debian/backports and the official 
Raspberry Pi OS repositories enabled (with Debian being preferred).

IEMberry comes with Pd from Debian/bullseye-backports pre-installed:
```
$ pd -version
Pd-0.53-1 ("") compiled for Debian (0.53.1+ds-2~bpo11+1) on 2023/01/31 
at 6:55:52 UTC
```

in order to get your patch running, I did:
- disconnect the [print button] object
- switch the Output Device to "bcm2835 Headphones (hardware)" (for 
whatever reason it preferred the "HDMI 1" output, even though no monitor 
is connected; probably some VNC thing)
- make sure to disable audio input (as the onboard soundcard has no adc)

i've run the "humanCaller_test.pd" patch for about half an hour without 
any problems, using ALSA as the backend.

seeing that everything works, i've stopped Pd, launched jackd (again 
making sure to output to the headphones instead of the non-existant 
monitor) and tried with JACK as backend.
after another 10 minutes I decided that everything works great.

gmadsr
IOhannes

-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_signature.asc
Type: application/pgp-signature
Size: 840 bytes
Desc: OpenPGP digital signature
URL: <http://lists.puredata.info/pipermail/pd-list/attachments/20231207/b3a4f95e/attachment.sig>