int main(void)
{
v4l_device *vd;
char *dev="/dev/video0";
v4l_open(dev,vd);
v4l_grab_picture(vd,1024);
printf("Hello World!\n");
return 0;
}
// ref effetv video.c function video_init()
int SwV4LDevice::VDopen(char * device, tBoxSize *newSize)
{
int maxc;
fprintf(stderr, "[V4L]::VDopen device '%s'\n", device);
if(device == NULL){
videodevice = new char [ strlen(DEFAULT_VIDEO_DEVICE) +1];
strcpy(videodevice, DEFAULT_VIDEO_DEVICE);
}
else {
videodevice = new char [ strlen(device) +1];
strcpy(videodevice, device);
}
if(v4l_open(videodevice)) {
return -1;
}
v4l_setdefaultnorm(norm); // moved after getcapabilities to get the channel number
v4l_getcapability();
// v4lsetdefaultnorm(norm);
// Read channel ...
if(!(vd.capability.type & VID_TYPE_CAPTURE)) {
fprintf(stderr, "[V4L]::VDOpen: This device seems not to support video capturing.\n");
return -1;
}
hastuner = 0;
if((vd.capability.type & VID_TYPE_TUNER)) {
hastuner = 1;
frequency_table = 0; // CSE : didn't undestand ... = freq;
TVchannel = 0;
}
// set acquisition size
changeSize(newSize);
getcurrentchannel();
maxc = vd.capability.channels;
if((maxc) && (channel <= maxc)) {
if(setchannel(channel))
return -1;
}
if(channel >= maxc) {
channel = maxc;
if(setchannel(channel))
return -1;
}
if(v4l_mmap()) {
fprintf(stderr, "[V4L]::VDopen: mmap interface is not supported by this driver.\n");
return -1;
}
/* quick hack for v4l driver that does not support double buffer capturing */
if(vd.mbuf.frames < 2) {
fprintf(stderr, "[V4L]::VDopen: double buffer capturing with mmap is not supported.\n");
return -1;
}
/* OLD COMMENT detecting a pixel format supported by the v4l driver.
* video_set_grabformat() overwrites both 'converter' and 'converter_hflip'.
* If 'converter' is non-NULL, palette converter must be initialized. */
if(setGrabFormat(palette)) {
fprintf(stderr, "[V4L]::VDopen: ERROR : Can't find a supported pixel format.\n");
return -1;
}
v4l_getpicture();
picture_brightness = vd.picture.brightness;
picture_hue = vd.picture.hue;
picture_colour = vd.picture.colour;
/*** END COPY ****/
if(StartGrab()) {
fprintf(stderr, "[V4L]::VDopen: Can't start grab.\n");
//normal at beginning or when capture has been stopped
}
initialised = true;
// echo();
return 0;
}
