Hi,
I'm trying to write a program to display images from my tv card
(a Hauppauge (bt878)).
When I try reading from it my program just hangs.
I've set up the card...
----
/* prepare new settings */
tv_vwin.width = 320;
tv_vwin.height = 240;
vid_pic.palette = VIDEO_PALETTE_RGB24;
vid_chan.channel = 1; /*composite 1*/
/* set them */
ioctl(tv_fd, VIDIOCSWIN, &tv_vwin);
if (ioctl(tv_fd, VIDIOCSPICT, &vid_pic) < 0) {
perror("Error setting palette\n");
return 0;
}
if (ioctl(tv_fd, VIDIOCSCHAN, &vid_chan) < 0) {
perror("Error setting channel\n");
return 0;
}
---
...ok as far as I can tell but when I try to read...
---
printf("Trying to read 230400 bytes\n");
bytes_read = read (tv_fd, tv_buff,230400);
printf("Read %d bytes \n",bytes_read);
---
it just hangs on the read. My program still hangs even if I only try to
read 3 bytes.
However if I replace tv_fd with cam_fd , and thus try to read from my
webcam the code works fine.
Are my problems because my tv card doesn't support read operations (is
there any way of telling?) or is there something else odd going on?
Thanks for any ideas
Martin
PS is there a more up-to-date version of the API documentation
anywhere - perhaps one that doesn't mention the seemingly non-existent
VIDEO_VC_NORM , mentions that VIDIOCSCHAN might want a structure rather
than an int and tells me what palette 17 is?
Should I be asking this question elsewhere or looking at some other
documentation?
