[Vm-dev] Audio problems on Linux - part 1 (OSS)

[Phil B]

One correction: The configuration that worked was running on OS X 10.10
with the Squeak 5.1 VM.  (the latest VMs don't appear to support this
version of OS X)

On Wed, Oct 9, 2019 at 11:05 PM Phil B <pbpublist at gmail.com> wrote:

> I'm having problems recording audio using a relatively recent (20190724)
> build of the 64-bit VM on Linux (Debian 10) and was curious to see if this
> is a known issue or not.  I've been running with the OSS drivers for a
> while now[1] which have been running fine for audio playback at least
> (provided I wrap launching the vm with padsp.)  However, I haven't needed
> to record audio since I started using the OSS drivers.
>
> So recently I wanted to record audio (specifically using
> SoundPlugin primitiveSoundStartRecording/primitiveSoundRecordSamples/primitiveSoundStopRecording)
> and immediately ran into problems.  The image becomes almost completely
> unresponsive (regardless of what priority level I run the audio recording
> process at) and at best I get back a few fragments of audio when I stop
> recording.  No error messages in the console, errors in the image, etc.
> Just an unresponsive image and eventually an unusable recording.
>
> I switched over to another OS / VM (OS X 10.11) with the same image and
> audio recording works just fine.  OK, so the image isn't itself doesn't
> appear to be the problem, but rather some combination of my OS / VM /
> driver setup.  My question is: should recording via OSS drivers be expected
> to work?  If so, any suggestions on what I should be looking at?
>
> Thinking that this might be considered an obsolete/unsupported
> configuration, I try changing my VM audio drivers which results in another
> issue in part 2...
>
> [1] I started doing this due to Linux VM builds going a period of time
> without alternate (ALSA/PulseAudio) audio drivers included.  Not sure if
> this has been resolved or not given my issue in part 2.
>
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