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High-performance mode via ISP for CSI

This script uses high-performance implementation for directly accessing sensor feeds and passing it via DMA into bcm2385 ISP. As such it does not implement brightness control similarly to libcamera.

# This script uses dumped IMX519 parametrs that are feed into bcm2385 ISP module
# This does not provide automatic brightness control
# Other sensors can be supported the same way as long as ISP parameters are adapted
tools/csi_camera.sh -help
tools/csi_camera.sh -camera-format=RG10 ...

This mode allows to provide significantly better performance for camera sensors than described in specs. For example for Arducam 16MP (using IMX519) it is possible to achieve:

  1. 120fps on 1280x720, with latency of about 50ms, where-as documentation says 1280x720x60p
  2. 60fps on 1920x1080, with latency of about 90ms, where-as documentation says 1920x1080x30p
  3. 30fps on 2328x1748, with latency of about 140ms, where-as documentation says 2328x1748x15p

The above was tested with camera connected to Raspberry PI Zero 2W, streaming MJPEG over WiFi with camera recording https://www.youtube.com/watch?v=e8ZtPSIfWPc from desktop monitor. So, it as well measured also a desktop rendering latency.