mimas::image_v4linput< T > Class Template Reference
[Image Input]

Class for reading images from a video4linux device. More...

#include <image_v4linput.h>

Inheritance diagram for mimas::image_v4linput< T >:

[legend]Collaboration diagram for mimas::image_v4linput< T >:


Public Member Functions
	image_v4linput (const std::string &_device, int channel=0, int width=-1, int height=-1, int channel_norm=VIDEO_MODE_PAL) throw (mimasexception)
	~image_v4linput (void)
virtual void	read (image< T > &img) throw (mimasexception)
	Read image from arbitrary source.
int	getWidth (void) const
int	getHeight (void) const
void	setSensivity (__u16 brightness, __u16 hue, __u16 colour, __u16 contrast) throw (mimasexception)
Protected Member Functions
int	xioctl (int request, void *arg)
void	selectPalette (void) throw (mimasexception)
Protected Attributes
std::string	device
int	fd
void *	map
video_channel	chan
video_picture	pic
video_window	win
video_mbuf	buf

Detailed Description

template<typename T>
class mimas::image_v4linput< T >

Class for reading images from a video4linux device.

The class has been successfully tested for colour-images (i.e. T = rgba< unsigned char >) and the following devices:

Logitech QuickCam Pro 4000
BT848A video (Imagenation PXC20)
BT878 (Unknown generic)

See V4L-API for more information about video4linux.

Here is a minimal example program on how to grab and display images with this class:

#include <fstream>
#include <GL/glut.h>
#include "image_v4linput.h"
#include "image_mesaoutput.h"

using namespace std;
using namespace mimas;

// Minimal program for accessing video data using libxine.
int main( int argc, char *argv[] )
{
  int retVal = 0;

  try {

    // Initialise GLUT.
    glutInit( &argc, argv );

    // Open X11 display.
    x11_display display;

    // Open V4L device.
    image_v4linput< rgba< unsigned char > > input( "/dev/video0" );

    // Open window.
    image_mesaoutput< rgba< unsigned char > > window( &display );

    // Allocate image.
    image< rgba< unsigned char > > img;

    // Loop for images.
    while ( input ) {
      
      // Grab image.
      input >> img;

      // Display image.
      window << img;
      
    };

  } catch ( exception &e ) {

    cerr << e.what() << endl;
    retVal = 1;

  };
  
  return retVal;
}

Author:: Bala Amavasai (bala@amavasai.org)
Jan Wedekind (jan at wedesoft.de)

Date:: Wed Mar 2 14:58:34 GMT 2005

Definition at line 36 of file image_v4linput.h.

Constructor & Destructor Documentation

template<typename T>

mimas::image_v4linput< T >::image_v4linput	(	const std::string &	_device,
		int	channel = `0`,
		int	width = `-1`,
		int	height = `-1`,
		int	channel_norm = `VIDEO_MODE_PAL`
	)			throw (mimasexception)