Ubuntu 22.10: Project closes if there are no audio output devices

[dalexeev]

Godot version

v3.5.stable.official [991bb6a], v4.0.beta3.official [01ae26d]

System information

Kubuntu 22.10

Issue description

Not sure if this is a Godot or Ubuntu bug, but I'll report it here as the running project is closing. I think this is wrong behavior.

When trying to play audio, the running project closes with the following errors if there are no audio output devices (for example, headphones are not connected).

E 0:00:00.216   pa_sink_info_cb: PulseAudio: sink info error: No such entity
  <C++ Source>  drivers/pulseaudio/audio_driver_pulseaudio.cpp:77 @ pa_sink_info_cb()

E 0:00:00.216   init_device: PulseAudio: init device failed to detect number of output channels
  <C++ Source>  drivers/pulseaudio/audio_driver_pulseaudio.cpp:195 @ init_device()

Perhaps this is due to the fact that in 22.10 Ubuntu switched from PulseAudio to PipeWire.

Steps to reproduce

Try running a project with audio on Ubuntu 22.10 without audio output devices.

If any configs are required, I can provide them.

Minimal reproduction project

No response

[Calinou]

• Related to Distorted sound on Windows with Corsair or SteelSeries Wireless Headset #25875.

Godot should definitely be able to fallback if no audio output device is present, but this needs to be checked on all platforms.

[DreamHollow]

It looks like this error might be related to the way the code is written in 'godot/audio_driver_pulseaudio.cpp'

There seems to be no built-in case for an actual 0 device error; I'm not sure if it's supposed to be coded that way intentionally.

void AudioDriverPulseAudio::pa_sink_info_cb(pa_context *c, const pa_sink_info *l, int eol, void *userdata) {
	AudioDriverPulseAudio *ad = static_cast<AudioDriverPulseAudio *>(userdata);

	// If eol is set to a positive number, you're at the end of the list
	if (eol > 0) {
		return;
	}

	// If eol is set to a negative number there's an error.
	if (eol < 0) {
		ERR_PRINT("PulseAudio: sink info error: " + String(pa_strerror(pa_context_errno(c))));
		ad->pa_status--;
		return;
	}

	ad->pa_map = l->channel_map;
	ad->pa_status++;
}

So the less than 0 condition is called instead, rather than a condition that would allow for a complete lack of an audio device?

[Calinou]

@DreamHollow Can you test changing eol < 0 to eol == 0 locally and see if it resolves the issue?

[dalexeev]

This is no longer reproducible on my configuration. Let's close this if nobody can confirm it.

[Calinou]

Closing per the above comment. For future readers, please comment if you can still reproduce this on the latest Godot version.