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EXAMPLE.md

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  1. check libcamera_proc running

If Not sure what exactly module is running, then just rmmod.

$ lsmod | grep libcamera_proc
libcamera_proc         12288  0

$ sudo rmmod libcamera_proc
  1. run libcamera_proc for data exchange with other program
$ sudo insmod ./build/libcamera_proc.ko
  1. run libcamera_mon

Make sure libcamera-vid is NOT running.

$ ./build/libcamera_mon
Configuration:
  Buffer size: 64
  Required data size: 256
  FIFO path: /tmp/libcamera/logs
  Sampling frequency: 30.00 Hz
  Cutoff frequency: 5.00 Hz
  Sampling method: 0
    (0: arithmetic+filter, 1: raw+filter, 2: arithmetic, 3: raw)
Calculated alpha: 0.1429
Path '/tmp/libcamera/' already exists.
Path '/tmp/libcamera/logs' already exists.
FIFO file '/tmp/libcamera/logs' opened successfully. Waiting for input...
PROC file '/proc/libcamera_proc' opened successfully. Waiting for write...
  1. execute libcamera-vid, make sure to use --verbose, then stream the log to pip /tmp/libcamera/logs
$ libcamera-vid \
  --verbose \
  --inline \
  --width 1920 \
  --height 1080 \
  --bitrate 4000000 \
  --framerate 30 \
  --hflip \
  --vflip \
  --timeout 0 \
  -o - 2> /tmp/libcamera/logs | \
  /usr/bin/gst-launch-1.0 \
    -v fdsrc ! h264parse ! rtph264pay config-interval=1 pt=35 ! udpsink sync=false host=127.0.0.1 port=5602
  1. libcamera_mon will get data as follows:
No more data. Waiting for libcamera log message...
No more data. Waiting for libcamera log message...
No more data. Waiting for libcamera log message...
No more data. Waiting for libcamera log message...
No more data. Waiting for libcamera log message...
No more data. Waiting for libcamera log message...
No more data. Waiting for libcamera log message...
No more data. Waiting for libcamera log message...
No more data. Waiting for libcamera log message...
....Failed(-2) to parse data. Discarding all data in the ring buffer.
.....Failed(-2) to parse data. Discarding all data in the ring buffer.
.....Failed(-2) to parse data. Discarding all data in the ring buffer.
.....Failed(-2) to parse data. Discarding all data in the ring buffer.
.....Failed(-2) to parse data. Discarding all data in the ring buffer.
.....Failed(-2) to parse data. Discarding all data in the ring buffer.
.....Failed(-2) to parse data. Discarding all data in the ring buffer.
.....Failed(-2) to parse data. Discarding all data in the ring buffer.
.....Failed(-2) to parse data. Discarding all data in the ring buffer.
.....Failed(-2) to parse data. Discarding all data in the ring buffer.
.....Failed(-2) to parse data. Discarding all data in the ring buffer.
........68: frame=127, fps=-0.00, size=127, bitrate=filtered(-0.00, -0.00) Mbps
...........68: frame=127, fps=-0.00, size=127, bitrate=filtered(-0.00, -0.00) Mbps
...........67: frame=-2, fps=30.01, size=20904, bitrate=filtered(0.72, 5.02) Mbps
............67: frame=-2, fps=30.01, size=17023, bitrate=filtered(1.20, 4.09) Mbps
.........67: frame=-2, fps=30.01, size=18952, bitrate=filtered(1.68, 4.55) Mbps
.............66: frame=-2, fps=30.01, size=8984, bitrate=filtered(1.75, 2.16) Mbps
..........67: frame=-2, fps=30.01, size=15932, bitrate=filtered(2.05, 3.82) Mbps
..........67: frame=-2, fps=30.01, size=15932, bitrate=filtered(2.30, 3.82) Mbps
........67: frame=-2, fps=30.01, size=15932, bitrate=filtered(2.52, 3.82) Mbps
............67: frame=-2, fps=30.01, size=15932, bitrate=filtered(2.70, 3.82) Mbps
...........67: frame=-2, fps=30.01, size=15932, bitrate=filtered(2.86, 3.82) Mbps
..........67: frame=-2, fps=30.01, size=19233, bitrate=filtered(3.12, 4.62) Mbps
........67: frame=-2, fps=30.01, size=19233, bitrate=filtered(3.33, 4.62) Mbps
........67: frame=-2, fps=30.01, size=16876, bitrate=filtered(3.43, 4.05) Mbps
........67: frame=-2, fps=30.01, size=16876, bitrate=filtered(3.52, 4.05) Mbps
........67: frame=-2, fps=30.01, size=16876, bitrate=filtered(3.60, 4.05) Mbps
........67: frame=-2, fps=29.99, size=16491, bitrate=filtered(3.65, 3.96) Mbps
...........67: frame=-2, fps=29.99, size=16491, bitrate=filtered(3.69, 3.96) Mbps
.........67: frame=-2, fps=30.01, size=15898, bitrate=filtered(3.71, 3.82) Mbps
.........67: frame=-2, fps=30.01, size=15584, bitrate=filtered(3.72, 3.74) Mbps
.............67: frame=-2, fps=30.01, size=15584, bitrate=filtered(3.72, 3.74) Mbps
............67: frame=-2, fps=30.01, size=15485, bitrate=filtered(3.72, 3.72) Mbps
...........67: frame=-2, fps=30.01, size=15814, bitrate=filtered(3.73, 3.80) Mbps
........67: frame=-2, fps=30.01, size=26604, bitrate=filtered(4.11, 6.39) Mbps
  1. we can get result from proc system
$ cat /proc/libcamera_proc
frame=-2, fps=30.01, size=15932, bitrate=filtered(2.05, 3.82) Mbps

Note: There is an update.sh loop cat messages.