Kinect refuses to be recognized as a microphone when gspca modules are loaded in the kernel

[gataria]

OS/Package information

• OS: Pop!_OS 20.10 x86_64, based on Ubuntu 20.10
• Kernel: 5.8.0-7642-generic

• Relevant package versions:

  • alsa-base: 1.0.25+dfsg-0ubuntu5

    Issue

    Had to do some troubleshooting to figure out the issue, but I got to it: After compiling and installing this driver and restarting (@grandchild's fork in particular, using a slightly modified version of @SterlingButters's install-webcam.sh script that I have attached), the Kinect's webcam does appear to work as a v4l2 loopback device. However, after this, the Kinect's microphones came to be undetected by ALSA. Running ALSA's alsa-info.sh troubleshooting script (from https://www.alsa-project.org/wiki/AlsaInfo looked to only show the following sound cards:

    
    !!Soundcards recognised by ALSA
    !!-----------------------------

  0 [NVidia ]: HDA-Intel - HDA NVidia HDA NVidia at 0xf7080000 irq 107 1 [Generic ]: HDA-Intel - HD-Audio Generic HD-Audio Generic at 0xf7900000 irq 110

  However, after blacklisting the `gspca_kinect2` and `gspca_main` modules by creating a `*.conf` file in `/etc/modprobe.d`, like so:

  Do not load gspca modules. Enabling them results in the Kinect refusing to work as a microphone.

  blacklist gspca_kinect2 blacklist gspca_main

  and rebooting, `alsa-info.sh` outputted this list of soundcards:

  !!Soundcards recognised by ALSA !!-----------------------------

  0 [NVidia ]: HDA-Intel - HDA NVidia HDA NVidia at 0xf7080000 irq 107 1 [Sensor ]: USB-Audio - Xbox NUI Sensor Microsoft Xbox NUI Sensor at usb-0000:02:00.0-4, super speed 2 [Generic ]: HDA-Intel - HD-Audio Generic HD-Audio Generic at 0xf7900000 irq 109

  
  and the Kinect's microphone was recognized by `pulseaudio` then.

I'm not sure if there's just some conflict between ALSA and the modules that use the Kinect as a webcam, but hopefully there's a way to resolve this problem. I figure that not only would someone want to use the Kinect as a webcam, but also as a microphone as well. It's also possible that this is just an issue with my own system -- I did have to screw around with multiple programs to be able to successfully use the Kinect as a webcam (which may have screwed with some things I'm unaware of), and I'm not certain if I ever did or did not see the webcam and microphone working at the same time -- so hopefully creating an issue helps in making sure whether or not this is a unique issue.

[gataria]

Sorry, forgot to attach install-webcam.sh. Here is what I used:

apt-get install ffmpeg

echo "Cloning GSPCA Repo..."
git clone https://github.com/grandchild/gspca-kinect2.git && cd gspca-kinect2
echo "Building & Installing Modules (copying into /lib/modules/`uname -r`/kernel/drivers/kinect)"
make -C /lib/modules/`uname -r`/build  M=`pwd` SRCROOT=`pwd` clean modules
cp gspca_main.ko gspca_kinect_main.ko
cp gspca_kinect_main.ko /lib/modules/`uname -r`/kernel/drivers/kinect/gspca_kinect_main.ko
cp gspca_kinect2.ko /lib/modules/`uname -r`/kernel/drivers/kinect/gspca_kinect2.ko
cd ..

echo "Cloning V4L2Loopback Repo..." 
git clone https://github.com/umlaeute/v4l2loopback.git && cd v4l2loopback
echo "Building and Installing Modules"
make && make install
cd ..
echo "Resolving Module Dependencies"
depmod -a
echo "Enabling GSPCA & V4L2Loopback Modules at boot"
for module in "videodev" "gspca_kinect_main" "gspca_kinect2" "v4l2loopback"
do
    if grep -Fxq $module /etc/modules
    then
            echo "$module found - skipping..."
    else
            echo "$module not found - adding to /etc/modules"
                echo $module >> /etc/modules
    fi
done

echo "options video_nr=10 card_label='Kinect v2'" > /etc/modprobe.d/v4l2loopback.conf
echo "Creating ffmpeg service v4l2-loopback.service"
echo "[Unit]
Description=V4L2 Loopback Service for Kinect Webcam

[Service]
Type=simple
ExecStart=ffmpeg -i /dev/video1 -vsync drop -filter:v fps=30,scale=1920:-1,hflip -pix_fmt yuyv422 -color_trc bt709 -color_primaries bt709 -color_range tv -f v4l2 /dev/video0

[Install]
WantedBy=multi-user.target" > /lib/systemd/system/v4l2-loopback.service

echo "Enabling v4l2-loopback.service at boot"
systemctl enable v4l2-loopback

I should also note that I disabled the v4l2-loopback.service by issuing systemctl disable v4l2-loopback and I commented out the modules that were added to /etc/modules.