V4L/DVB (10210): Fix a bug on v4lgrab.c
v4lgrab breaks the fputc macro on some systems, because of #defined FILE. Also, I also added comments because it was not at all clear that to get gspca cameras to work with this application you need v4l1compat. Signed-off-by: Simon Harrison <si1356@yahoo.co.uk> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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@ -11,6 +11,15 @@
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* Copied from http://www.tazenda.demon.co.uk/phil/vgrabber.c
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* with minor modifications (Dave Forrest, drf5n@virginia.edu).
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*
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*
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* For some cameras you may need to pre-load libv4l to perform
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* the necessary decompression, e.g.:
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*
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* export LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so
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* ./v4lgrab >image.ppm
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*
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* see http://hansdegoede.livejournal.com/3636.html for details.
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*
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*/
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#include <unistd.h>
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@ -24,7 +33,7 @@
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#include <linux/types.h>
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#include <linux/videodev.h>
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#define FILE "/dev/video0"
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#define VIDEO_DEV "/dev/video0"
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/* Stole this from tvset.c */
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@ -90,7 +99,7 @@ int get_brightness_adj(unsigned char *image, long size, int *brightness) {
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int main(int argc, char ** argv)
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{
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int fd = open(FILE, O_RDONLY), f;
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int fd = open(VIDEO_DEV, O_RDONLY), f;
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struct video_capability cap;
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struct video_window win;
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struct video_picture vpic;
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@ -100,13 +109,13 @@ int main(int argc, char ** argv)
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unsigned int i, src_depth;
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if (fd < 0) {
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perror(FILE);
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perror(VIDEO_DEV);
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exit(1);
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}
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if (ioctl(fd, VIDIOCGCAP, &cap) < 0) {
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perror("VIDIOGCAP");
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fprintf(stderr, "(" FILE " not a video4linux device?)\n");
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fprintf(stderr, "(" VIDEO_DEV " not a video4linux device?)\n");
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close(fd);
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exit(1);
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}
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