Skype and Hangouts

[Schorsch]

I'm experimenting with using the Logitech c920 webcam on Pine 64 with 2GB of RAM. I tried different Android images and I got some interesting results.

android-ver5.1.1-20161208-pine64-32GB.img.gz:
- camera works fine with Hangouts
- video message works in Skype, but calling drops the video after a few seconds
- the microphone doesn't work in any app, looks like it's missing the kernel driver for USB audio snd_usb_audio

The list of sound cards is missing the USB sound device:

Code:

# cat /proc/asound/cards                                  
0 [audiocodec     ]: audiocodec - audiocodec
                     audiocodec
1 [sndhdmi        ]: sndhdmi - sndhdmi
                     sndhdmi

The snd_usb_audio was not build-in and was not available as a module:

Code:

# lsmod | grep snd_usb_audio
# ls /sys/module/ | grep snd_usb_audio

android-ver6.0-20170112-pine64-32GB.img.gz:
- Skype video message works, Skype call and Hangouts doesn't
- microphone doesn't work, although it has the kernel USB audio driver build-in

The USB sound card is present:

Code:

# cat /proc/asound/cards
0 [C920           ]: USB-Audio - HD Pro Webcam C920
                     HD Pro Webcam C920 at usb-sunxi-ehci-1, high speed
1 [audiocodec     ]: audiocodec - audiocodec
                     audiocodec
2 [sndhdmi        ]: sndhdmi - sndhdmi
                     sndhdmi

android-6.0-pine-a64-tv-v1.0.1-r20.img.gz and android-7.0-pine-a64-tv-v1.11.0-r67.img.gz:
- no Skype video message, no Hangouts video
- microphone doesn't seem to work, even though it has the necessary kernel USB audio driver build-in

android-7.1-pine-a64-v0.1.1-r2.img.gz
- video doesn't work at all
- microphone works, it has the kernel USB audio driver build-in

I've also fiddled around with the following files:
- /system/etc/camera.cfg - contains the configuration of the cameras
- /system/etc/audio_policy.conf - contains the configuration of the audio stack

Let me know if you have other suggestions.

Any update on this thread? I finally got around to hooking up my pine64 (no issues, android); connected a hdmi monitor, USB camera, launched skype, started a call - but the audio is not working either way. I cannot hear the other side, and they cannot hear me. The video feed is stable. I am using a Genius Full HD 1080p USB webcam which has built in microphone (both work with other devices).  
I am looking for pointers how to debug this, if there isn't a straight forward fix (e.g. it's the OS, it's the power supply)