getting frame data from /dev/video1 for processing and displaying, Linux on iMX6Q

[jingyizhang]

Hi,

I am trying to write a terminal app which init the camera and manipulate the input frame by frame on a pixel level before displaying to LCD or storing to disk.

Can anyone point me in the right direction on how to get started? I am very new to programming in Linux, any documentation or sample code would be very helpful.

I am currently running an unmodified fsl-image-qt5-x11-imx6qdlsolo image on the i.MX6Q Sabre-SD Platform board.

[BiyongSUN]

Please refer to the mxc_vpu_test.out source code.

for test, here is the command

modprobe ov5640_camera_mipi
modprobe ov5642_camera
modprobe mxc_v4l2_capture

/unit_tests/mxc_vpu_test.out -E "-x 0 -o /enc.h264 -w 720 -h 480   -c 5000 -f 2"

-x <input method> input mode V4L2 with video node
         0 - /dev/video0, 1 - /dev/video1, and so on

then you can play the enc.h264 with following command

/unit_tests/mxc_vpu_test.out  -D "-i /enc.h264 "

[Yuri]

  General information how to use V4L2 API (with examples) may be found at

http://linuxtv.org/downloads/v4l-dvb-apis/

Also, it makes sense to look at Chapter 9 [Video for Linux Two (V4L2)
Driver ] of “i.MX_6_Linux_Reference_Manual.pdf” ; in particular – section
9.5.2 (Video4Linux API test).

https://www.freescale.com/webapp/Download?colCode=L3.14.28_1.0.0_LINUX_DOCS&location=null&fpsp=1&WT_...


You may to look to test sources on the host Linux :

/fsl-release-bsp/tmp/work/-poky-linux-gnueabi/imx-test/

Inside each test’s directory you will find the available documentation.

Have a great day,
Yuri

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