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Camera

Testing our MIPI cameras

Camera probe

Make sure the camera is connected, and boot the board. Then, run the following command to verify the camera was detected successfully:

v4l2-ctl --list-devices

This should produce the following output:

i.MX6S_CSI (platform:30710000.csi):
        /dev/video1

pxp (pxp_v4l2_out):
        /dev/video0

In the output seen above, "i.MX6S_CSI" is the camera, and "pxp" is the i.MX Pixel Processing Pipeline.

i.MX platform-specific GStreamer plugins

Run the following command to verify you have the i.MX7 platform-specific GStreamer plugins installed on your system:

gst-inspect-1.0 | grep "imx"
imxpxp:  imxpxpvideotransform: Freescale PxP video transform
imxpxp:  imxpxpvideosink: Freescale PxP video sink
imxv4l2videosrc:  imxv4l2videosrc: V4L2 CSI Video Source
imxaudio:  imxmp3audioenc: Freescale i.MX MP3 encoder
imxaudio:  imxuniaudiodec: Freescale i.MX uniaudio decoder

Gstreamer example 1: Testing Camera Loopback / Camera preview on the display

The below pipelines are suitable for the fslc-based Yocto releases for the VAR-SOM-MX7 (Yocto Morty and newer).

  • For 640x480@30fps:
gst-launch-1.0 imxv4l2videosrc device=/dev/video1 imx-capture-mode=0 ! imxpxpvideosink
  • For 720x480@30fps:
gst-launch-1.0 imxv4l2videosrc device=/dev/video1 imx-capture-mode=1 ! imxpxpvideosink
  • For 1280x720@30fps :
gst-launch-1.0 imxv4l2videosrc device=/dev/video1 imx-capture-mode=2 ! imxpxpvideosink
  • For 1920x1080@30fps:
gst-launch-1.0 imxv4l2videosrc device=/dev/video1 imx-capture-mode=3 ! imxpxpvideosink
  • For 2592x1944@15fps:
gst-launch-1.0 imxv4l2videosrc device=/dev/video1 imx-capture-mode=4 ! imxpxpvideosink

Gstreamer example 2: Taking a JPEG snapshot from the camera

To capture and encode a JPEG snapshot from the camera, run one of the below pipelines depending on the wanted resolution:

  • For 640x480:
gst-launch-1.0 imxv4l2videosrc device=/dev/video1 num-buffers=1 imx-capture-mode=0 ! 'video/x-raw,format=UYVY' ! jpegenc ! filesink location=/tmp/test.jpg
  • For 720x480:
gst-launch-1.0 imxv4l2videosrc device=/dev/video1 num-buffers=1 imx-capture-mode=1 ! 'video/x-raw,format=UYVY' ! jpegenc ! filesink location=/tmp/test.jpg
  • For 1280x720:
gst-launch-1.0 imxv4l2videosrc device=/dev/video1 num-buffers=1 imx-capture-mode=2 ! 'video/x-raw,format=UYVY' ! jpegenc ! filesink location=/tmp/test.jpg
  • For 1920x1080:
gst-launch-1.0 imxv4l2videosrc device=/dev/video1 num-buffers=1 imx-capture-mode=3 ! 'video/x-raw,format=UYVY' ! jpegenc ! filesink location=/tmp/test.jpg
  • For 2592x1944:
gst-launch-1.0 imxv4l2videosrc device=/dev/video1 num-buffers=1 imx-capture-mode=4 ! 'video/x-raw,format=UYVY' ! jpegenc ! filesink location=/tmp/test.jpg

References