[L2Ork-dev] Flatpak build - audio backend testing

[Jonathan Wilkes]

On Mon, Jul 20, 2020 at 3:46 PM Sam Thursfield <ssssam at gmail.com> wrote:
>
> Hi :)
>
> On Mon, Jul 20, 2020 at 8:26 PM Jonathan Wilkes <jon.w.wilkes at gmail.com> wrote:
> > 1. I haven't read the ALSA Adventure Dungeon Map in a while. Is
> > "pulse" really a valid ALSA device,
> > or are you reusing the "-alsaadd" interface for the purpose of
> > re-routing to pulse?
>
> It's an ALSA device implemented by a plugin, the plugin itself being
> installed by PulseAudio. I haven't checked, but I guess it exists on
> most/all Linuxes that ship PulseAudio.
>
> > 2. Are you suggesting to have Purr Data on Linux default to "-alsaadd
> > pulse" and to have that device
> > selected by default? I think that's a good idea as newcomers will be
> > able to run youtube tutorials at the
> > same time as Purr Data.
>
> Ideally, yes :)
>
> > 3. If #2 above is the case, does anything in the Audio preferences tab
> > need to change? In other words,
> > are "sample rate", "block size", and "delay" still operational while
> > using the pulse device?
>
> That's a good question and I haven't yet figured out the answer. In
> testing I saw some 'audio dropout' type errors which suggest things
> aren't working as they should. I also got different results depending
> on the blocksize. It needs more testing, and ideally input from
> someone who knows more about ALSA and Pulseaudio than I do :)
>
> > 4. With the pulse device selected and a youtube video paused, what
> > happens if the user chooses a
> > direct-audio-hardware-access device in the audio list and clicks "Ok?"
>
> Probably something like this:
>
>     snd_pcm_open (input): Device or resource busy
>     snd_pcm_open (output): Device or resource busy
>
> Followed by a lack of sound :)

That would be unfortunate.

With all of Pulse's high level abstractions, is there really no way to tell
it, "I'm ready for exclusive low-latency access now, please move everyone
else out of my way."

-Jonathan

> Sam
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