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hifiberry / hifiberry-dsp

DSP toolkit
MIT License
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Cannot find DSPVolume when hifiberry is not the default alsa device (eg when running pulseaudio) #39

Closed chatziko closed 1 year ago

chatziko commented 2 years ago

sigmatcpserver tries to open DSPVolume in the default alsa device. If hifiberry is not the default device, it fails with

ERROR:root:ALSA mixer DSPVolume not found"

and the alsa mixer becomes ususable (it does not control the DSP volume). Tested on pi4 with DAC+DSP.

This happens for instance if pulseaudio is running (default in recent Raspberry Pi OS), since a pulseaudio compatibility wrapper is set as the default alsa device.

Correct behaviour: when multiple alsa deviecs are present, sigmatcpserver should detect which is the hifiberry one.

Workaround: pulseaudio's wrapper alsa device can be disabled by commenting out the contents of /etc/alsa/conf.d/99-pulse.conf (this however means that a program cannot use alsa to output sound via pulseaudio).

RobisLV commented 1 year ago

Hi! I do not know if this is still relevant but I made a fix for this issue. I will submit PR and link to the fix today.

hifiberry commented 1 year ago

We're happy to look into a PR for this.

hifiberry commented 1 year ago

PR merged

chatziko commented 1 year ago

Seems to work fine, thanks!

PS. A pypi release might be useful, there seem to be a few changes since the last one.