USB Camera Driver Installation

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:

  • 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 ant libjpeg8-dev

It will download and install the required prereqs,
 


  • Now download the latest version of the library (v4l4j-0.x.x.tar.gz) from the following link https://code.google.com/archive/p/v4l4j/downloads
  • Then go to the v4l4j directory (cd v4l4j-0.x.x) 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

 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.

  • Once the build process is completed

  • Install by running command

                                      sudo ant install




  • Finally test the library by running command
                                    ant test-fps