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Added main loop for loading new frames

Martijn Braam 3 years ago
parent
commit
38ec7621fc
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GPG Key ID: C4280ACB000B060F
  1. 317
      main.c
  2. 3
      uvc.ini

317
main.c

@ -19,6 +19,7 @@ struct buffer {
};
struct buffer *buffers;
static int *outbuffer;
static unsigned int n_buffers;
static char *rear_dev_name;
static char *front_dev_name;
@ -53,54 +54,54 @@ start_capturing(int fd)
{
enum v4l2_buf_type type;
switch (io) {
case IO_METHOD_READ:
/* Nothing to do. */
break;
case IO_METHOD_MMAP:
for (int i = 0; i < n_buffers; ++i) {
struct v4l2_buffer buf = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.memory = V4L2_MEMORY_MMAP,
.index = i,
};
if (xioctl(fd, VIDIOC_QBUF, &buf) == -1) {
errno_exit("VIDIOC_QBUF");
case IO_METHOD_READ:
/* Nothing to do. */
break;
case IO_METHOD_MMAP:
for (int i = 0; i < n_buffers; ++i) {
struct v4l2_buffer buf = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.memory = V4L2_MEMORY_MMAP,
.index = i,
};
if (xioctl(fd, VIDIOC_QBUF, &buf) == -1) {
errno_exit("VIDIOC_QBUF");
}
}
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(fd, VIDIOC_STREAMON, &type) == -1) {
errno_exit("VIDIOC_STREAMON");
}
break;
case IO_METHOD_USERPTR:
for (int i = 0; i < n_buffers; ++i) {
struct v4l2_buffer buf = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.memory = V4L2_MEMORY_USERPTR,
.index = i,
};
buf.m.userptr = (unsigned long)buffers[i].start;
buf.length = buffers[i].length;
if (xioctl(fd, VIDIOC_QBUF, &buf) == -1) {
errno_exit("VIDIOC_QBUF");
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(fd, VIDIOC_STREAMON, &type) == -1) {
errno_exit("VIDIOC_STREAMON");
}
break;
case IO_METHOD_USERPTR:
for (int i = 0; i < n_buffers; ++i) {
struct v4l2_buffer buf = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.memory = V4L2_MEMORY_USERPTR,
.index = i,
};
buf.m.userptr = (unsigned long) buffers[i].start;
buf.length = buffers[i].length;
if (xioctl(fd, VIDIOC_QBUF, &buf) == -1) {
errno_exit("VIDIOC_QBUF");
}
}
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(fd, VIDIOC_STREAMON, &type) == -1) {
errno_exit("VIDIOC_STREAMON");
}
break;
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(fd, VIDIOC_STREAMON, &type) == -1) {
errno_exit("VIDIOC_STREAMON");
}
break;
}
}
static void
init_mmap(int fd)
{
struct v4l2_requestbuffers req = { 0 };
struct v4l2_requestbuffers req = {0};
req.count = 4;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
@ -108,7 +109,7 @@ init_mmap(int fd)
if (xioctl(fd, VIDIOC_REQBUFS, &req) == -1) {
if (errno == EINVAL) {
fprintf(stderr, "%s does not support memory mapping",
dev_name);
dev_name);
exit(EXIT_FAILURE);
} else {
errno_exit("VIDIOC_REQBUFS");
@ -117,7 +118,7 @@ init_mmap(int fd)
if (req.count < 2) {
fprintf(stderr, "Insufficient buffer memory on %s\n",
dev_name);
dev_name);
exit(EXIT_FAILURE);
}
@ -159,7 +160,7 @@ init_device(int fd)
if (xioctl(fd, VIDIOC_QUERYCAP, &cap) == -1) {
if (errno == EINVAL) {
fprintf(stderr, "%s is no V4L2 device\n",
dev_name);
dev_name);
exit(EXIT_FAILURE);
} else {
errno_exit("VIDIOC_QUERYCAP");
@ -168,26 +169,26 @@ init_device(int fd)
if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
fprintf(stderr, "%s is no video capture device\n",
dev_name);
dev_name);
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",
case IO_METHOD_READ:
if (!(cap.capabilities & V4L2_CAP_READWRITE)) {
fprintf(stderr, "%s does not support read i/o\n",
dev_name);
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",
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",
dev_name);
exit(EXIT_FAILURE);
}
break;
exit(EXIT_FAILURE);
}
break;
}
/* Select video input, video standard and tune here. */
@ -195,19 +196,19 @@ init_device(int fd)
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
};
struct v4l2_crop crop = { 0 };
struct v4l2_crop crop = {0};
if (xioctl(fd, VIDIOC_CROPCAP, &cropcap) == 0) {
crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
crop.c = cropcap.defrect; /* reset to default */
if (xioctl(fd, VIDIOC_S_CROP, &crop) == -1) {
switch (errno) {
case EINVAL:
/* Cropping not supported. */
break;
default:
/* Errors ignored. */
break;
case EINVAL:
/* Cropping not supported. */
break;
default:
/* Errors ignored. */
break;
}
}
} else {
@ -220,7 +221,7 @@ init_device(int fd)
};
if (preview_width > 0) {
g_printerr("Setting camera to %dx%d fmt %d\n",
preview_width, preview_height, preview_fmt);
preview_width, preview_height, preview_fmt);
fmt.fmt.pix.width = preview_width;
fmt.fmt.pix.height = preview_height;
fmt.fmt.pix.pixelformat = preview_fmt;
@ -231,8 +232,8 @@ init_device(int fd)
}
g_printerr("Driver returned %dx%d fmt %d\n",
fmt.fmt.pix.width, fmt.fmt.pix.height,
fmt.fmt.pix.pixelformat);
fmt.fmt.pix.width, fmt.fmt.pix.height,
fmt.fmt.pix.pixelformat);
/* Note VIDIOC_S_FMT may change width and height. */
@ -243,10 +244,12 @@ init_device(int fd)
errno_exit("VIDIOC_G_FMT");
}
g_printerr("Driver returned %dx%d fmt %d\n",
fmt.fmt.pix.width, fmt.fmt.pix.height,
fmt.fmt.pix.pixelformat);
fmt.fmt.pix.width, fmt.fmt.pix.height,
fmt.fmt.pix.pixelformat);
preview_width = fmt.fmt.pix.width;
preview_height = fmt.fmt.pix.height;
}
preview_fmt = fmt.fmt.pix.pixelformat;
/* Buggy driver paranoia. */
unsigned int min = fmt.fmt.pix.width * 2;
@ -259,109 +262,111 @@ init_device(int fd)
}
switch (io) {
case IO_METHOD_READ:
//init_read(fmt.fmt.pix.sizeimage);
break;
case IO_METHOD_READ:
//init_read(fmt.fmt.pix.sizeimage);
break;
case IO_METHOD_MMAP:
init_mmap(fd);
break;
case IO_METHOD_MMAP:
init_mmap(fd);
break;
case IO_METHOD_USERPTR:
//init_userp(fmt.fmt.pix.sizeimage);
break;
case IO_METHOD_USERPTR:
//init_userp(fmt.fmt.pix.sizeimage);
break;
}
}
static void
process_image(const void *p, int size)
process_image(const int *p, int size)
{
GdkPixbuf *pixbuf = gdk_pixbuf_new_from_data(p, GDK_COLORSPACE_RGB,
FALSE, 8, 640, 480, 2 * 640, NULL, NULL);
gtk_image_set_from_pixbuf(preview_image, pixbuf);
FALSE, 8, 640, 480, 2 * 640,
NULL, NULL);
gtk_image_set_from_pixbuf(preview_image, pixbuf
);
}
static int
read_frame(int fd)
{
struct v4l2_buffer buf = { 0 };
struct v4l2_buffer buf = {0};
switch (io) {
case IO_METHOD_READ:
if (read(fd, buffers[0].start, buffers[0].length) == -1) {
switch (errno) {
case EAGAIN:
return 0;
case EIO:
/* Could ignore EIO, see spec. */
/* fallthrough */
default:
errno_exit("read");
break;
case IO_METHOD_READ:
if (read(fd, buffers[0].start, buffers[0].length) == -1) {
switch (errno) {
case EAGAIN:
return 0;
case EIO:
/* Could ignore EIO, see spec. */
/* fallthrough */
default:
errno_exit("read");
break;
}
}
}
process_image(buffers[0].start, buffers[0].length);
break;
case IO_METHOD_MMAP:
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
if (xioctl(fd, VIDIOC_DQBUF, &buf) == -1) {
switch (errno) {
case EAGAIN:
return 0;
case EIO:
/* Could ignore EIO, see spec. */
/* fallthrough */
default:
errno_exit("VIDIOC_DQBUF");
break;
process_image(buffers[0].start, buffers[0].length);
break;
case IO_METHOD_MMAP:
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
if (xioctl(fd, VIDIOC_DQBUF, &buf) == -1) {
switch (errno) {
case EAGAIN:
return 0;
case EIO:
/* Could ignore EIO, see spec. */
/* fallthrough */
default:
errno_exit("VIDIOC_DQBUF");
break;
}
}
}
//assert(buf.index < n_buffers);
//assert(buf.index < n_buffers);
process_image(buffers[buf.index].start, buf.bytesused);
process_image(buffers[buf.index].start, buf.bytesused);
if (xioctl(fd, VIDIOC_QBUF, &buf) == -1) {
errno_exit("VIDIOC_QBUF");
}
break;
case IO_METHOD_USERPTR:
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_USERPTR;
if (xioctl(fd, VIDIOC_DQBUF, &buf) == -1) {
switch (errno) {
case EAGAIN:
return 0;
case EIO:
/* Could ignore EIO, see spec. */
/* fallthrough */
default:
errno_exit("VIDIOC_DQBUF");
break;
if (xioctl(fd, VIDIOC_QBUF, &buf) == -1) {
errno_exit("VIDIOC_QBUF");
}
}
unsigned int i;
for (i = 0; i < n_buffers; ++i) {
if (buf.m.userptr == (unsigned long)buffers[i].start
break;
case IO_METHOD_USERPTR:
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_USERPTR;
if (xioctl(fd, VIDIOC_DQBUF, &buf) == -1) {
switch (errno) {
case EAGAIN:
return 0;
case EIO:
/* Could ignore EIO, see spec. */
/* fallthrough */
default:
errno_exit("VIDIOC_DQBUF");
break;
}
}
unsigned int i;
for (i = 0; i < n_buffers; ++i) {
if (buf.m.userptr == (unsigned long) buffers[i].start
&& buf.length == buffers[i].length) {
break;
break;
}
}
}
//assert(i < n_buffers);
//assert(i < n_buffers);
process_image((void *)buf.m.userptr, buf.bytesused);
if (xioctl(fd, VIDIOC_QBUF, &buf) == -1) {
errno_exit("VIDIOC_QBUF");
}
break;
process_image((void *) buf.m.userptr, buf.bytesused);
if (xioctl(fd, VIDIOC_QBUF, &buf) == -1) {
errno_exit("VIDIOC_QBUF");
}
break;
}
return 1;
}
static void
static gboolean
get_frame(int fd)
{
while (1) {
@ -393,31 +398,35 @@ get_frame(int fd)
}
/* EAGAIN - continue select loop. */
}
return TRUE;
}
static int
config_ini_handler(void *user, const char *section, const char *name,
const char *value) {
const char *value)
{
if (strcmp(section, "preview") == 0) {
if (strcmp(name, "width") == 0) {
preview_width = strtol(value, NULL, 10);
} else if (strcmp(name, "height") == 0) {
preview_height = strtol(value, NULL, 10);
} else if (strcmp(name, "fmt") == 0) {
if (strcmp(value, "RGB") == 0){
if (strcmp(value, "RGB") == 0) {
preview_fmt = V4L2_PIX_FMT_RGB24;
} else if (strcmp(value, "UYVY8") == 0) {
} else if (strcmp(value, "UYVY") == 0) {
preview_fmt = V4L2_PIX_FMT_UYVY;
} else if (strcmp(value, "YUYV") == 0) {
preview_fmt = V4L2_PIX_FMT_YUYV;
} else if (strcmp(value, "JPEG") == 0) {
preview_fmt = V4L2_PIX_FMT_JPEG;
} else if (strcmp(value, "NV12") == 0) {
preview_fmt = V4L2_PIX_FMT_NV12;
} else if (strcmp(value, "YUV420") == 0
|| strcmp(value, "I420") == 0
|| strcmp(value, "YU12") == 0) {
|| strcmp(value, "I420") == 0
|| strcmp(value, "YU12") == 0) {
preview_fmt = V4L2_PIX_FMT_YUV420;
} else if (strcmp(value, "YVU420") == 0
|| strcmp(value, "YV12") == 0) {
|| strcmp(value, "YV12") == 0) {
preview_fmt = V4L2_PIX_FMT_YVU420;
} else {
g_printerr("Unsupported pixelformat %s\n", value);
@ -454,8 +463,8 @@ main(int argc, char *argv[])
GError *error = NULL;
gtk_init(&argc, &argv);
GtkBuilder *builder = gtk_builder_new();
char* glade_file = "/usr/share/camera/ui/camera.glade";
if (access( "camera.glade", F_OK) != -1) {
char *glade_file = "/usr/share/camera/ui/camera.glade";
if (access("camera.glade", F_OK) != -1) {
glade_file = "camera.glade";
}
if (gtk_builder_add_from_file(builder, glade_file, &error) == 0) {
@ -470,15 +479,15 @@ main(int argc, char *argv[])
g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
GtkCssProvider *provider = gtk_css_provider_new();
if (access( "camera.css", F_OK) != -1) {
if (access("camera.css", F_OK) != -1) {
gtk_css_provider_load_from_path(provider, "camera.css", NULL);
} else {
gtk_css_provider_load_from_path(provider, "/usr/share/camera/ui/camera.css", NULL);
}
GtkStyleContext *context = gtk_widget_get_style_context(preview_box);
gtk_style_context_add_provider(context,
GTK_STYLE_PROVIDER(provider),
GTK_STYLE_PROVIDER_PRIORITY_USER);
GTK_STYLE_PROVIDER(provider),
GTK_STYLE_PROVIDER_PRIORITY_USER);
int result = ini_parse(argv[1], config_ini_handler, NULL);
if (result == -1) {
@ -502,7 +511,9 @@ main(int argc, char *argv[])
init_device(fd);
start_capturing(fd);
get_frame(fd);
// Get a new frame every 34ms ~30fps
g_timeout_add(34, get_frame, fd);
gtk_widget_show(window);
gtk_main();

3
uvc.ini

@ -3,4 +3,5 @@ rear=/dev/video0
[preview]
width=640
height=480
height=480
fmt=YUYV
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