Could be a problem with sample rates or sample format. I poked around a bit and it seems that the phone or tablet has a really complicated setup of ALSA. Some of the magic may be happening inside the android container and there may be hardware acceleration for encoding/decoding for different codecs in the chipset. You can see the available ALSA devices with aplay -lL, arecord -lL, amixer. There are more than twenty devices for playback. And umpteen switches and parameters in the mixer. Without expert advice this will be difficult to tackle. On the pulseaudio side things look more straightforward. "pactl list short sinks" lists only two devices, a default one and one probably for bluetooth. At the moment your chain is something like ALSA default => pulseaudio => ALSA => HAL => Hardware. Your program talks to ALSA where the default devices are defined as pulseaudio. Pulseaudio has the modules module-droid-discover and module-droid-card-22 loaded which presumably talk to drivers within the android container (pactl list modules). The drivers in the android container are ALSA (kernel and/or userspace) modules talking to android's hardware abstraction layer (HAL). Lots of possibilities for things to go wrong in the chain.
Anyhow, I guess you could use pavucontrol to see whether baresip actually uses pulseaudio (indirectly, via ALSA defaults) and if so you should be able to attach a recording software to pulseaudio to record incoming and outgoing audio streams. For example, I am streaming from the phone's pulseaudio to a raspberry pulseaudio which has been patched to stream to airplay speakers. Now any sound output on the phone it is relayed to the airplay speakers. > sound is there now!!! > > but somehow clittered; don't know how to describe it better; can I record > it > with baresip to a file? Any options to tweak? > > matthias > -- > Matthias Apitz, ✉ g...@unixarea.de, ⌂ http://www.unixarea.de/ ☎ > +49-176-38902045 > "Die Verkaufsschlager des Buchmarkts geben Auskunft über den Zustand einer > Gesellschaft bzw. > sind, was diese Zeiten angeht, Gradmesser fortschreitenden Schwachsinns. > ..." (jW 19.05.2016) > > -- > Mailing list: https://launchpad.net/~ubuntu-phone > Post to : ubuntu-phone@lists.launchpad.net > Unsubscribe : https://launchpad.net/~ubuntu-phone > More help : https://help.launchpad.net/ListHelp >
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