on-connect and on-disconnect audio does not play, aplay is blocking about bt-speaker

[lukasjapan]

I think your sound card (plug0) does not have an integrated hardware mixer.
That is why you can only use one sound stream at a time, preventing the login/logout sounds which are played after the bluetooth audio stream connects (to your soundcard).

I don't think a mixer function belongs in this repository, so your best bet is to setup a software mixer with alsa.

http://alsa.opensrc.org/Hardware_mixing,_software_mixing

Or you could try to use a full suite like pulseaudio or jack.
But I only had trouble with those on the Pi, thats the reason I made this project.

[photon-schiesser]

Or you could try to use a full suite like pulseaudio or jack.
But I only had trouble with those on the Pi, thats the reason I made this project.

And that's the reason I am using this project. I love simple and low-level over the black magic of pulseaudio.

I think software mixing is the ticket. Thanks for your help.

I would like to leave this open until I can post a solution or my findings. What do you think?

Just out of curiosity, do you think the lack of a hardware mixer is due to a driver issue, or the USB audio chip (PCM2704) simply lacks the functionality?

[lukasjapan]

A very quick research left me with even more questions but I get the impression that the mixing function is build in the driver (called mmap) rather than using real hardware mixing.

Anybody correct me if I am wrong.

ALSA seems to have settings for mmap in the config too. I think people will appreciate it if you can manage to post a working config.