Mutah/FloatImg4PythonBinding
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pretty formating the kluge

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Tonton Th 2019-05-27 17:11:43 +02:00
parent 2a40718410
commit 1fdd8901a1
1 changed files with 135 additions and 96 deletions
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113
v4l2/v4l2grab.c
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@ -30,19 +30,34 @@
size_t length; size_t length;
}; };
static void xioctl(int fh, int request, void *arg) int verbosity;
{
int r;
do { /* --------------------------------------------------------------------- */
static void xioctl(int fh, int request, void *arg)
{
int r;
do {
r = v4l2_ioctl(fh, request, arg); r = v4l2_ioctl(fh, request, arg);
} while (r == -1 && ((errno == EINTR) || (errno == EAGAIN))); } while (r == -1 && ((errno == EINTR) || (errno == EAGAIN)));
if (r == -1) { if (r == -1) {
fprintf(stderr, "error %d, %s\n", errno, strerror(errno)); fprintf(stderr, "error %d, %s\n", errno, strerror(errno));
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
} }
/* --------------------------------------------------------------------- */
void help(int v)
{
puts("options :");
puts("\t-d /dev/?\tselect video device");
puts("\t-n NNN\t\thow many frames ?");
puts("\t-p NNN\t\tperiod in seconds");
puts("\t-v\t\tincrease verbosity");
exit(0);
}
/* --------------------------------------------------------------------- */
int main(int argc, char **argv) int main(int argc, char **argv)
{ {
@ -59,35 +74,52 @@
FILE *fout; FILE *fout;
struct buffer *buffers; struct buffer *buffers;
fd = v4l2_open(dev_name, O_RDWR | O_NONBLOCK, 0); int period = 10; /* delai entre les captures */
if (fd < 0) { int nbre_capt = 1; /* nombre de captures */
int opt;
while ((opt = getopt(argc, argv, "d:hn:p:v")) != -1) {
switch(opt) {
case 'd': dev_name = optarg; break;
case 'h': help(0); break;
case 'n': nbre_capt = atoi(optarg); break;
case 'p': period = atoi(optarg); break;
case 'v': verbosity++; break;
}
}
fd = v4l2_open(dev_name, O_RDWR | O_NONBLOCK, 0);
if (fd < 0) {
perror("Cannot open device"); perror("Cannot open device");
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
CLEAR(fmt); CLEAR(fmt);
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = 640; fmt.fmt.pix.width = 640;
fmt.fmt.pix.height = 480; fmt.fmt.pix.height = 480;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB24; fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB24;
fmt.fmt.pix.field = V4L2_FIELD_INTERLACED; fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
xioctl(fd, VIDIOC_S_FMT, &fmt); xioctl(fd, VIDIOC_S_FMT, &fmt);
if (fmt.fmt.pix.pixelformat != V4L2_PIX_FMT_RGB24) { if (fmt.fmt.pix.pixelformat != V4L2_PIX_FMT_RGB24) {
printf("Libv4l didn't accept RGB24 format. Can't proceed.\n"); printf("Libv4l didn't accept RGB24 format. Can't proceed.\n");
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
if ((fmt.fmt.pix.width != 640) || (fmt.fmt.pix.height != 480)) if ((fmt.fmt.pix.width != 640) || (fmt.fmt.pix.height != 480)) {
printf("Warning: driver is sending image at %dx%d\n", printf("Warning: driver is sending image at %dx%d\n",
fmt.fmt.pix.width, fmt.fmt.pix.height); fmt.fmt.pix.width, fmt.fmt.pix.height);
}
CLEAR(req); CLEAR(req);
req.count = 2; req.count = 2;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP; req.memory = V4L2_MEMORY_MMAP;
xioctl(fd, VIDIOC_REQBUFS, &req); xioctl(fd, VIDIOC_REQBUFS, &req);
buffers = calloc(req.count, sizeof(*buffers)); buffers = calloc(req.count, sizeof(*buffers));
for (n_buffers = 0; n_buffers < req.count; ++n_buffers) { for (n_buffers = 0; n_buffers < req.count; ++n_buffers) {
CLEAR(buf); CLEAR(buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
@ -107,17 +139,18 @@
} }
} }
for (i = 0; i < n_buffers; ++i) { for (i = 0; i < n_buffers; ++i) {
CLEAR(buf); CLEAR(buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP; buf.memory = V4L2_MEMORY_MMAP;
buf.index = i; buf.index = i;
xioctl(fd, VIDIOC_QBUF, &buf); xioctl(fd, VIDIOC_QBUF, &buf);
} }
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
xioctl(fd, VIDIOC_STREAMON, &type); type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
for (i = 0; i < 10; i++) {
xioctl(fd, VIDIOC_STREAMON, &type);
for (i = 0; i < nbre_capt; i++) {
do { do {
FD_ZERO(&fds); FD_ZERO(&fds);
FD_SET(fd, &fds); FD_SET(fd, &fds);
@ -128,6 +161,7 @@
r = select(fd + 1, &fds, NULL, NULL, &tv); r = select(fd + 1, &fds, NULL, NULL, &tv);
} while ((r == -1 && (errno = EINTR))); } while ((r == -1 && (errno = EINTR)));
if (r == -1) { if (r == -1) {
perror("select"); perror("select");
return errno; return errno;
@ -139,7 +173,8 @@
xioctl(fd, VIDIOC_DQBUF, &buf); xioctl(fd, VIDIOC_DQBUF, &buf);
sprintf(out_name, "out%03d.ppm", i); sprintf(out_name, "out%03d.ppm", i);
fprintf(stderr, "--> %s\n", out_name); if (verbosity) fprintf(stderr, "--> %s\n", out_name);
fout = fopen(out_name, "w"); fout = fopen(out_name, "w");
if (!fout) { if (!fout) {
perror("Cannot open image"); perror("Cannot open image");
@ -149,16 +184,20 @@
fmt.fmt.pix.width, fmt.fmt.pix.height); fmt.fmt.pix.width, fmt.fmt.pix.height);
fwrite(buffers[buf.index].start, buf.bytesused, 1, fout); fwrite(buffers[buf.index].start, buf.bytesused, 1, fout);
fclose(fout); fclose(fout);
sleep(666); if (nbre_capt > 1 && period) {
sleep(period);
}
xioctl(fd, VIDIOC_QBUF, &buf); xioctl(fd, VIDIOC_QBUF, &buf);
} }
type = V4L2_BUF_TYPE_VIDEO_CAPTURE; type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
xioctl(fd, VIDIOC_STREAMOFF, &type); xioctl(fd, VIDIOC_STREAMOFF, &type);
for (i = 0; i < n_buffers; ++i) for (i = 0; i < n_buffers; ++i) {
v4l2_munmap(buffers[i].start, buffers[i].length); v4l2_munmap(buffers[i].start, buffers[i].length);
v4l2_close(fd);
return 0;
} }
v4l2_close(fd);
return 0;
}