Video for Linux

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Extract from V4L-DVB wiki: The V4L API is essentially a kernel interface for analog video capture and output drivers, and is applicable to most video streams that are not related to DVB devices ... or graphics cards -- though, the V4L API also entails a few oddities such as analog radio and RDS services. Examples of devices which fall within the scope of V4L are, amongst others, webcams, MPEG encoders/decoders, digital video streamers, analog TV tuners and video capture devices.

Installation

V4L core drivers are by default installed on APF27 configurations. APF9328 is currently not able to handle V4L compatible image capture streams.

Vivi driver

• V4L comes with a test driver called vivi that can be used to test your V4L applications:

<M>   Virtual Video Driver

# modprobe vivi
Linux video capture interface: v2.00
vivi: V4L2 device registered as /dev/video0
Video Technology Magazine Virtual Video Capture Board ver 0.5.0 successfully loaded.

Capture

• in target/demos/camera/ you will find a test application capture (derived from http://linuxtv.org/downloads/video4linux/API/V4L2_API/v4l2spec/capture.c)
• to compile it:

$ make shell_env
$ source armadeus_env.sh
$ cd target/demos/camera/capture/
$ make CC=$ARMADEUS_TOOLCHAIN_PATH/arm-linux-gcc

• you can also compile it for your Host if needed:

$ cd target/demos/camera/capture/
$ make clean
$ make

• to use it, copy capture executable (ARM one) to your board and then launch (here for example with a 800x480 LCD):

# ./capture --width 800 --height 480 --camwidth 640 --camheight 480

Links

• V4L-DVB Wiki