Installing V4l4j

For the ucam handler to work two things are needed, the video driver of the camera which comes by default and the v4l4j library. The steps below show installing of v4l4j library
Steps:

1. Before installing the v4l4j some packages are needed to be installed. If you are running debian based operating system type the command

sudo apt-get install openjdk-7-jdk ant libjpeg8-dev

It will download and install the required prereqs,

1. To download the v4l4j you need subversion(svn) tool, download and install it as shown below

sudo apt-get install subversion

1. Now download the library using the following command

svn co http://v4l4j.googlecode.com/svn/v4l4j/trunk v4l4j-trunk

1. Then go to the v4l4j-trunk directory (cd v4l4j-trunk) and start the build process by typing the command shown below

{}On Raspbian Wheezy (Raspberry pi):
JDK_HOME=/usr/lib/jvm/java-7-openjdk-armhf/ LIBPIXFC=pixfc-sse/libpixfc-sse-armv6l-hardfp.a ant clean all
*On Wheezy beta: (Raspberry Pi)*
JDK_HOME=/usr/lib/jvm/java-7-openjdk-armhf/ LIBPIXFC=pixfc-sse/libpixfc-sse-armv6l-softfp.a ant clean all
On other environments setup
Setup JDK_HOME environment variable to your JDK path and do
ant clean all

1. If you get this error "error: libv4lconvert.h: No such file or directory" , type

sudo apt-get install libv4l-dev

And do the build process again.

1. Once the build process is completed

1. Install by running command

sudo ant install

1. Finally test the library by running command

ant test-fps