CSI Camera & I2S Mic
Original parts in the links below, or cheaper compatible ones could be used. And the fixtures are at your choice.
Camera Module v1 & v2 : https://www.raspberrypi.com/documentation/accessories/camera.html#hardware-specification
Stereo I2S Mic : https://learn.adafruit.com/adafruit-i2s-mems-microphone-breakout/raspberry-pi-wiring-test
aosp : https://github.com/android-rpi/local_manifests/tree/arpi-13-camic
kernel : https://github.com/android-rpi/kernel_manifest/tree/arpi-5.15-camic
/external/libcamera porting for RPi4 is pulled from https://github.com/glodroid
camera : https://github.com/android-rpi/RpCamera
mic echo : https://github.com/peyo-hd/MicTest
Audio output is working only with 3.5mm headphone port.