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-rw-r--r--v4l2-apps/test/capture_example.c436
1 files changed, 200 insertions, 236 deletions
diff --git a/v4l2-apps/test/capture_example.c b/v4l2-apps/test/capture_example.c
index bbb0c4e57..a15ef3c09 100644
--- a/v4l2-apps/test/capture_example.c
+++ b/v4l2-apps/test/capture_example.c
@@ -27,7 +27,7 @@
#include <linux/videodev2.h>
-#define CLEAR(x) memset (&(x), 0, sizeof (x))
+#define CLEAR(x) memset(&(x), 0, sizeof(x))
typedef enum {
IO_METHOD_READ,
@@ -36,60 +36,53 @@ typedef enum {
} io_method;
struct buffer {
- void * start;
- size_t length;
+ void *start;
+ size_t length;
};
-static char * dev_name = NULL;
-static io_method io = IO_METHOD_MMAP;
-static int fd = -1;
-struct buffer * buffers = NULL;
-static unsigned int n_buffers = 0;
-static int out_buf = 0;
+static char *dev_name;
+static io_method io = IO_METHOD_MMAP;
+static int fd = -1;
+struct buffer *buffers;
+static unsigned int n_buffers;
+static int out_buf;
+static int force_format;
-static void
-errno_exit (const char * s)
+static void errno_exit(const char *s)
{
- fprintf (stderr, "%s error %d, %s\n",
- s, errno, strerror (errno));
-
- exit (EXIT_FAILURE);
+ fprintf(stderr, "%s error %d, %s\n", s, errno, strerror(errno));
+ exit(EXIT_FAILURE);
}
-static int
-xioctl (int fd,
- int request,
- void * arg)
+static int xioctl(int fh, int request, void *arg)
{
int r;
- do r = ioctl (fd, request, arg);
- while (-1 == r && EINTR == errno);
+ do {
+ r = ioctl(fh, request, arg);
+ } while (-1 == r && EINTR == errno);
return r;
}
-static void
-process_image (const void * p,
- int size)
+static void process_image(const void *p, int size)
{
- if (!out_buf)
- fputc ('.', stdout);
- else
- fwrite (p, size, 1, stdout);
+ if (out_buf)
+ fwrite(p, size, 1, stdout);
- fflush (stdout);
+ fflush(stderr);
+ fprintf(stderr, ".");
+ fflush(stdout);
}
-static int
-read_frame (void)
+static int read_frame(void)
{
struct v4l2_buffer buf;
unsigned int i;
switch (io) {
case IO_METHOD_READ:
- if (-1 == read (fd, buffers[0].start, buffers[0].length)) {
+ if (-1 == read(fd, buffers[0].start, buffers[0].length)) {
switch (errno) {
case EAGAIN:
return 0;
@@ -100,21 +93,20 @@ read_frame (void)
/* fall through */
default:
- errno_exit ("read");
+ errno_exit("read");
}
}
- process_image (buffers[0].start, buffers[0].length);
-
+ process_image(buffers[0].start, buffers[0].length);
break;
case IO_METHOD_MMAP:
- CLEAR (buf);
+ CLEAR(buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
- if (-1 == xioctl (fd, VIDIOC_DQBUF, &buf)) {
+ if (-1 == xioctl(fd, VIDIOC_DQBUF, &buf)) {
switch (errno) {
case EAGAIN:
return 0;
@@ -125,26 +117,25 @@ read_frame (void)
/* fall through */
default:
- errno_exit ("VIDIOC_DQBUF");
+ errno_exit("VIDIOC_DQBUF");
}
}
- assert (buf.index < n_buffers);
+ assert(buf.index < n_buffers);
- process_image (buffers[buf.index].start, buffers[buf.index].length);
-
- if (-1 == xioctl (fd, VIDIOC_QBUF, &buf))
- errno_exit ("VIDIOC_QBUF");
+ process_image(buffers[buf.index].start, buf.bytesused);
+ if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
+ errno_exit("VIDIOC_QBUF");
break;
case IO_METHOD_USERPTR:
- CLEAR (buf);
+ CLEAR(buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_USERPTR;
- if (-1 == xioctl (fd, VIDIOC_DQBUF, &buf)) {
+ if (-1 == xioctl(fd, VIDIOC_DQBUF, &buf)) {
switch (errno) {
case EAGAIN:
return 0;
@@ -155,30 +146,28 @@ read_frame (void)
/* fall through */
default:
- errno_exit ("VIDIOC_DQBUF");
+ errno_exit("VIDIOC_DQBUF");
}
}
for (i = 0; i < n_buffers; ++i)
- if (buf.m.userptr == (unsigned long) buffers[i].start
+ if (buf.m.userptr == (unsigned long)buffers[i].start
&& buf.length == buffers[i].length)
break;
- assert (i < n_buffers);
-
- process_image ((void *) buf.m.userptr, buf.length);
+ assert(i < n_buffers);
- if (-1 == xioctl (fd, VIDIOC_QBUF, &buf))
- errno_exit ("VIDIOC_QBUF");
+ process_image((void *)buf.m.userptr, buf.bytesused);
+ if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
+ errno_exit("VIDIOC_QBUF");
break;
}
return 1;
}
-static void
-mainloop (void)
+static void mainloop(void)
{
unsigned int count;
@@ -190,37 +179,34 @@ mainloop (void)
struct timeval tv;
int r;
- FD_ZERO (&fds);
- FD_SET (fd, &fds);
+ FD_ZERO(&fds);
+ FD_SET(fd, &fds);
/* Timeout. */
tv.tv_sec = 2;
tv.tv_usec = 0;
- r = select (fd + 1, &fds, NULL, NULL, &tv);
+ r = select(fd + 1, &fds, NULL, NULL, &tv);
if (-1 == r) {
if (EINTR == errno)
continue;
-
- errno_exit ("select");
+ errno_exit("select");
}
if (0 == r) {
- fprintf (stderr, "select timeout\n");
- exit (EXIT_FAILURE);
+ fprintf(stderr, "select timeout\n");
+ exit(EXIT_FAILURE);
}
- if (read_frame ())
+ if (read_frame())
break;
-
/* EAGAIN - continue select loop. */
}
}
}
-static void
-stop_capturing (void)
+static void stop_capturing(void)
{
enum v4l2_buf_type type;
@@ -232,16 +218,13 @@ stop_capturing (void)
case IO_METHOD_MMAP:
case IO_METHOD_USERPTR:
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-
- if (-1 == xioctl (fd, VIDIOC_STREAMOFF, &type))
- errno_exit ("VIDIOC_STREAMOFF");
-
+ if (-1 == xioctl(fd, VIDIOC_STREAMOFF, &type))
+ errno_exit("VIDIOC_STREAMOFF");
break;
}
}
-static void
-start_capturing (void)
+static void start_capturing(void)
{
unsigned int i;
enum v4l2_buf_type type;
@@ -255,192 +238,179 @@ start_capturing (void)
for (i = 0; i < n_buffers; ++i) {
struct v4l2_buffer buf;
- CLEAR (buf);
+ CLEAR(buf);
+ buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ buf.memory = V4L2_MEMORY_MMAP;
+ buf.index = i;
- buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- buf.memory = V4L2_MEMORY_MMAP;
- buf.index = i;
-
- if (-1 == xioctl (fd, VIDIOC_QBUF, &buf))
- errno_exit ("VIDIOC_QBUF");
+ if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
+ errno_exit("VIDIOC_QBUF");
}
-
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-
- if (-1 == xioctl (fd, VIDIOC_STREAMON, &type))
- errno_exit ("VIDIOC_STREAMON");
-
+ if (-1 == xioctl(fd, VIDIOC_STREAMON, &type))
+ errno_exit("VIDIOC_STREAMON");
break;
case IO_METHOD_USERPTR:
for (i = 0; i < n_buffers; ++i) {
struct v4l2_buffer buf;
- CLEAR (buf);
+ CLEAR(buf);
+ buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ buf.memory = V4L2_MEMORY_USERPTR;
+ buf.index = i;
+ buf.m.userptr = (unsigned long)buffers[i].start;
+ buf.length = buffers[i].length;
- buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- buf.memory = V4L2_MEMORY_USERPTR;
- buf.index = i;
- buf.m.userptr = (unsigned long) buffers[i].start;
- buf.length = buffers[i].length;
-
- if (-1 == xioctl (fd, VIDIOC_QBUF, &buf))
- errno_exit ("VIDIOC_QBUF");
+ if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
+ errno_exit("VIDIOC_QBUF");
}
-
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-
- if (-1 == xioctl (fd, VIDIOC_STREAMON, &type))
- errno_exit ("VIDIOC_STREAMON");
-
+ if (-1 == xioctl(fd, VIDIOC_STREAMON, &type))
+ errno_exit("VIDIOC_STREAMON");
break;
}
}
-static void
-uninit_device (void)
+static void uninit_device(void)
{
unsigned int i;
switch (io) {
case IO_METHOD_READ:
- free (buffers[0].start);
+ free(buffers[0].start);
break;
case IO_METHOD_MMAP:
for (i = 0; i < n_buffers; ++i)
- if (-1 == munmap (buffers[i].start, buffers[i].length))
- errno_exit ("munmap");
+ if (-1 == munmap(buffers[i].start, buffers[i].length))
+ errno_exit("munmap");
break;
case IO_METHOD_USERPTR:
for (i = 0; i < n_buffers; ++i)
- free (buffers[i].start);
+ free(buffers[i].start);
break;
}
- free (buffers);
+ free(buffers);
}
-static void
-init_read (unsigned int buffer_size)
+static void init_read(unsigned int buffer_size)
{
- buffers = calloc (1, sizeof (*buffers));
+ buffers = calloc(1, sizeof(*buffers));
if (!buffers) {
- fprintf (stderr, "Out of memory\n");
- exit (EXIT_FAILURE);
+ fprintf(stderr, "Out of memory\n");
+ exit(EXIT_FAILURE);
}
buffers[0].length = buffer_size;
- buffers[0].start = malloc (buffer_size);
+ buffers[0].start = malloc(buffer_size);
if (!buffers[0].start) {
- fprintf (stderr, "Out of memory\n");
- exit (EXIT_FAILURE);
+ fprintf(stderr, "Out of memory\n");
+ exit(EXIT_FAILURE);
}
}
-static void
-init_mmap (void)
+static void init_mmap(void)
{
struct v4l2_requestbuffers req;
- CLEAR (req);
+ CLEAR(req);
- req.count = 4;
- req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- req.memory = V4L2_MEMORY_MMAP;
+ req.count = 4;
+ req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ req.memory = V4L2_MEMORY_MMAP;
- if (-1 == xioctl (fd, VIDIOC_REQBUFS, &req)) {
+ if (-1 == xioctl(fd, VIDIOC_REQBUFS, &req)) {
if (EINVAL == errno) {
- fprintf (stderr, "%s does not support "
+ fprintf(stderr, "%s does not support "
"memory mapping\n", dev_name);
- exit (EXIT_FAILURE);
+ exit(EXIT_FAILURE);
} else {
- errno_exit ("VIDIOC_REQBUFS");
+ errno_exit("VIDIOC_REQBUFS");
}
}
if (req.count < 2) {
- fprintf (stderr, "Insufficient buffer memory on %s\n",
+ fprintf(stderr, "Insufficient buffer memory on %s\n",
dev_name);
- exit (EXIT_FAILURE);
+ exit(EXIT_FAILURE);
}
- buffers = calloc (req.count, sizeof (*buffers));
+ buffers = calloc(req.count, sizeof(*buffers));
if (!buffers) {
- fprintf (stderr, "Out of memory\n");
- exit (EXIT_FAILURE);
+ fprintf(stderr, "Out of memory\n");
+ exit(EXIT_FAILURE);
}
for (n_buffers = 0; n_buffers < req.count; ++n_buffers) {
struct v4l2_buffer buf;
- CLEAR (buf);
+ CLEAR(buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = n_buffers;
- if (-1 == xioctl (fd, VIDIOC_QUERYBUF, &buf))
- errno_exit ("VIDIOC_QUERYBUF");
+ if (-1 == xioctl(fd, VIDIOC_QUERYBUF, &buf))
+ errno_exit("VIDIOC_QUERYBUF");
buffers[n_buffers].length = buf.length;
buffers[n_buffers].start =
- mmap (NULL /* start anywhere */,
+ mmap(NULL /* start anywhere */,
buf.length,
PROT_READ | PROT_WRITE /* required */,
MAP_SHARED /* recommended */,
fd, buf.m.offset);
if (MAP_FAILED == buffers[n_buffers].start)
- errno_exit ("mmap");
+ errno_exit("mmap");
}
}
-static void
-init_userp (unsigned int buffer_size)
+static void init_userp(unsigned int buffer_size)
{
struct v4l2_requestbuffers req;
- CLEAR (req);
+ CLEAR(req);
- req.count = 4;
- req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- req.memory = V4L2_MEMORY_USERPTR;
+ req.count = 4;
+ req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ req.memory = V4L2_MEMORY_USERPTR;
- if (-1 == xioctl (fd, VIDIOC_REQBUFS, &req)) {
+ if (-1 == xioctl(fd, VIDIOC_REQBUFS, &req)) {
if (EINVAL == errno) {
- fprintf (stderr, "%s does not support "
+ fprintf(stderr, "%s does not support "
"user pointer i/o\n", dev_name);
- exit (EXIT_FAILURE);
+ exit(EXIT_FAILURE);
} else {
- errno_exit ("VIDIOC_REQBUFS");
+ errno_exit("VIDIOC_REQBUFS");
}
}
- buffers = calloc (4, sizeof (*buffers));
+ buffers = calloc(4, sizeof(*buffers));
if (!buffers) {
- fprintf (stderr, "Out of memory\n");
- exit (EXIT_FAILURE);
+ fprintf(stderr, "Out of memory\n");
+ exit(EXIT_FAILURE);
}
for (n_buffers = 0; n_buffers < 4; ++n_buffers) {
buffers[n_buffers].length = buffer_size;
- buffers[n_buffers].start = malloc (buffer_size);
+ buffers[n_buffers].start = malloc(buffer_size);
if (!buffers[n_buffers].start) {
- fprintf (stderr, "Out of memory\n");
- exit (EXIT_FAILURE);
+ fprintf(stderr, "Out of memory\n");
+ exit(EXIT_FAILURE);
}
}
}
-static void
-init_device (void)
+static void init_device(void)
{
struct v4l2_capability cap;
struct v4l2_cropcap cropcap;
@@ -448,40 +418,38 @@ init_device (void)
struct v4l2_format fmt;
unsigned int min;
- if (-1 == xioctl (fd, VIDIOC_QUERYCAP, &cap)) {
+ if (-1 == xioctl(fd, VIDIOC_QUERYCAP, &cap)) {
if (EINVAL == errno) {
- fprintf (stderr, "%s is no V4L2 device\n",
+ fprintf(stderr, "%s is no V4L2 device\n",
dev_name);
- exit (EXIT_FAILURE);
+ exit(EXIT_FAILURE);
} else {
- errno_exit ("VIDIOC_QUERYCAP");
+ errno_exit("VIDIOC_QUERYCAP");
}
}
if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
- fprintf (stderr, "%s is no video capture device\n",
+ fprintf(stderr, "%s is no video capture device\n",
dev_name);
- exit (EXIT_FAILURE);
+ exit(EXIT_FAILURE);
}
switch (io) {
case IO_METHOD_READ:
if (!(cap.capabilities & V4L2_CAP_READWRITE)) {
- fprintf (stderr, "%s does not support read i/o\n",
+ fprintf(stderr, "%s does not support read i/o\n",
dev_name);
- exit (EXIT_FAILURE);
+ exit(EXIT_FAILURE);
}
-
break;
case IO_METHOD_MMAP:
case IO_METHOD_USERPTR:
if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
- fprintf (stderr, "%s does not support streaming i/o\n",
+ fprintf(stderr, "%s does not support streaming i/o\n",
dev_name);
- exit (EXIT_FAILURE);
+ exit(EXIT_FAILURE);
}
-
break;
}
@@ -489,15 +457,15 @@ init_device (void)
/* Select video input, video standard and tune here. */
- CLEAR (cropcap);
+ CLEAR(cropcap);
cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- if (0 == xioctl (fd, VIDIOC_CROPCAP, &cropcap)) {
+ if (0 == xioctl(fd, VIDIOC_CROPCAP, &cropcap)) {
crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
crop.c = cropcap.defrect; /* reset to default */
- if (-1 == xioctl (fd, VIDIOC_S_CROP, &crop)) {
+ if (-1 == xioctl(fd, VIDIOC_S_CROP, &crop)) {
switch (errno) {
case EINVAL:
/* Cropping not supported. */
@@ -512,18 +480,24 @@ init_device (void)
}
- CLEAR (fmt);
+ CLEAR(fmt);
- fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- fmt.fmt.pix.width = 640;
- fmt.fmt.pix.height = 480;
- fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
- fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
+ fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ if (force_format) {
+ fmt.fmt.pix.width = 640;
+ fmt.fmt.pix.height = 480;
+ fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
+ fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
- if (-1 == xioctl (fd, VIDIOC_S_FMT, &fmt))
- errno_exit ("VIDIOC_S_FMT");
+ if (-1 == xioctl(fd, VIDIOC_S_FMT, &fmt))
+ errno_exit("VIDIOC_S_FMT");
- /* Note VIDIOC_S_FMT may change width and height. */
+ /* Note VIDIOC_S_FMT may change width and height. */
+ } else {
+ /* Preserve original settings as set by v4l2-ctl for example */
+ if (-1 == xioctl(fd, VIDIOC_G_FMT, &fmt))
+ errno_exit("VIDIOC_G_FMT");
+ }
/* Buggy driver paranoia. */
min = fmt.fmt.pix.width * 2;
@@ -535,97 +509,91 @@ init_device (void)
switch (io) {
case IO_METHOD_READ:
- init_read (fmt.fmt.pix.sizeimage);
+ init_read(fmt.fmt.pix.sizeimage);
break;
case IO_METHOD_MMAP:
- init_mmap ();
+ init_mmap();
break;
case IO_METHOD_USERPTR:
- init_userp (fmt.fmt.pix.sizeimage);
+ init_userp(fmt.fmt.pix.sizeimage);
break;
}
}
-static void
-close_device (void)
+static void close_device(void)
{
- if (-1 == close (fd))
- errno_exit ("close");
+ if (-1 == close(fd))
+ errno_exit("close");
fd = -1;
}
-static void
-open_device (void)
+static void open_device(void)
{
struct stat st;
- if (-1 == stat (dev_name, &st)) {
- fprintf (stderr, "Cannot identify '%s': %d, %s\n",
- dev_name, errno, strerror (errno));
- exit (EXIT_FAILURE);
+ if (-1 == stat(dev_name, &st)) {
+ fprintf(stderr, "Cannot identify '%s': %d, %s\n",
+ dev_name, errno, strerror(errno));
+ exit(EXIT_FAILURE);
}
- if (!S_ISCHR (st.st_mode)) {
- fprintf (stderr, "%s is no device\n", dev_name);
- exit (EXIT_FAILURE);
+ if (!S_ISCHR(st.st_mode)) {
+ fprintf(stderr, "%s is no device\n", dev_name);
+ exit(EXIT_FAILURE);
}
- fd = open (dev_name, O_RDWR /* required */ | O_NONBLOCK, 0);
+ fd = open(dev_name, O_RDWR /* required */ | O_NONBLOCK, 0);
if (-1 == fd) {
- fprintf (stderr, "Cannot open '%s': %d, %s\n",
- dev_name, errno, strerror (errno));
- exit (EXIT_FAILURE);
+ fprintf(stderr, "Cannot open '%s': %d, %s\n",
+ dev_name, errno, strerror(errno));
+ exit(EXIT_FAILURE);
}
}
-static void
-usage (FILE * fp,
- int argc,
- char ** argv)
+static void usage(FILE *fp, int argc, char **argv)
{
- fprintf (fp,
+ fprintf(fp,
"Usage: %s [options]\n\n"
"Options:\n"
- "-d | --device name Video device name [/dev/video]\n"
+ "-d | --device name Video device name [/dev/video0]\n"
"-h | --help Print this message\n"
"-m | --mmap Use memory mapped buffers\n"
"-r | --read Use read() calls\n"
"-u | --userp Use application allocated buffers\n"
"-o | --output Outputs stream to stdout\n"
+ "-f | --format Force format to 640x480 YUYV\n"
"",
argv[0]);
}
-static const char short_options [] = "d:hmruo";
+static const char short_options[] = "d:hmruof";
static const struct option
-long_options [] = {
- { "device", required_argument, NULL, 'd' },
- { "help", no_argument, NULL, 'h' },
- { "mmap", no_argument, NULL, 'm' },
- { "read", no_argument, NULL, 'r' },
- { "userp", no_argument, NULL, 'u' },
- { "output", no_argument, NULL, 'o' },
+long_options[] = {
+ { "device", required_argument, NULL, 'd' },
+ { "help", no_argument, NULL, 'h' },
+ { "mmap", no_argument, NULL, 'm' },
+ { "read", no_argument, NULL, 'r' },
+ { "userp", no_argument, NULL, 'u' },
+ { "output", no_argument, NULL, 'o' },
+ { "format", no_argument, NULL, 'f' },
{ 0, 0, 0, 0 }
};
-int
-main (int argc,
- char ** argv)
+int main(int argc, char **argv)
{
- dev_name = "/dev/video";
+ dev_name = "/dev/video0";
for (;;) {
- int index;
+ int idx;
int c;
- c = getopt_long (argc, argv,
- short_options, long_options,
- &index);
+ c = getopt_long(argc, argv,
+ short_options, long_options, &idx);
if (-1 == c)
break;
@@ -639,8 +607,8 @@ main (int argc,
break;
case 'h':
- usage (stdout, argc, argv);
- exit (EXIT_SUCCESS);
+ usage(stdout, argc, argv);
+ exit(EXIT_SUCCESS);
case 'm':
io = IO_METHOD_MMAP;
@@ -658,27 +626,23 @@ main (int argc,
out_buf++;
break;
+ case 'f':
+ force_format++;
+ break;
+
default:
- usage (stderr, argc, argv);
- exit (EXIT_FAILURE);
+ usage(stderr, argc, argv);
+ exit(EXIT_FAILURE);
}
}
- open_device ();
-
- init_device ();
-
- start_capturing ();
-
- mainloop ();
-
- stop_capturing ();
-
- uninit_device ();
-
- close_device ();
-
- exit (EXIT_SUCCESS);
-
+ open_device();
+ init_device();
+ start_capturing();
+ mainloop();
+ stop_capturing();
+ uninit_device();
+ close_device();
+ fprintf(stderr, "\n");
return 0;
}