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megapixels
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A GTK3 camera application that knows how to deal with the media request api
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megapixels/main.c

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#include <errno.h>
#include <fcntl.h>
#include <linux/videodev2.h>
#include <linux/media.h>
#include <linux/v4l2-subdev.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <time.h>
#include <assert.h>
#include <limits.h>
#include <linux/kdev_t.h>
#include <sys/sysmacros.h>
#include <asm/errno.h>
#include <wordexp.h>
#include <gtk/gtk.h>
#include "config.h"
#include "ini.h"
#include "bayer.h"
#include "quickdebayer.h"
enum io_method {
IO_METHOD_READ,
IO_METHOD_MMAP,
IO_METHOD_USERPTR,
};
struct buffer {
void *start;
size_t length;
};
struct buffer *buffers;
static unsigned int n_buffers;
// Rear camera
static char *rear_dev_name;
static unsigned int rear_entity_id;
static char rear_dev[260];
static int rear_width = -1;
static int rear_height = -1;
static int rear_rate = 30;
static int rear_rotate = 0;
static int rear_fmt = V4L2_PIX_FMT_RGB24;
static int rear_mbus = MEDIA_BUS_FMT_RGB888_1X24;
// Front camera
static char *front_dev_name;
static unsigned int front_entity_id;
static char front_dev[260];
static int front_width = -1;
static int front_height = -1;
static int front_rate = 30;
static int front_rotate = 0;
static int front_fmt = V4L2_PIX_FMT_RGB24;
static int front_mbus = MEDIA_BUS_FMT_RGB888_1X24;
// Camera interface
static char *media_drv_name;
static unsigned int interface_entity_id;
static char dev_name[260];
static int media_fd;
static int video_fd;
// State
static int ready = 0;
static int current_width = -1;
static int current_height = -1;
static int current_fmt = 0;
static int current_rotate = 0;
static int current_fd;
static int capture = 0;
static int current_is_rear = 1;
static cairo_surface_t *surface = NULL;
static int preview_width = -1;
static int preview_height = -1;
// Widgets
GtkWidget *preview;
GtkWidget *error_box;
GtkWidget *error_message;
static int
xioctl(int fd, int request, void *arg)
{
int r;
do {
r = ioctl(fd, request, arg);
} while (r == -1 && errno == EINTR);
return r;
}
static void
errno_exit(const char *s)
{
fprintf(stderr, "%s error %d, %s\n", s, errno, strerror(errno));
exit(EXIT_FAILURE);
}
static void
show_error(const char *s)
{
gtk_label_set_text(GTK_LABEL(error_message), s);
gtk_widget_show(error_box);
}
static void
start_capturing(int fd)
{
enum v4l2_buf_type type;
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");
}
ready = 1;
}
static void
stop_capturing(int fd)
{
int i;
ready = 0;
printf("Stopping capture\n");
enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(fd, VIDIOC_STREAMOFF, &type) == -1) {
errno_exit("VIDIOC_STREAMOFF");
}
for (i = 0; i < n_buffers; ++i) {
munmap(buffers[i].start, buffers[i].length);
}
}
static void
init_mmap(int fd)
{
struct v4l2_requestbuffers req = {0};
req.count = 4;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
if (xioctl(fd, VIDIOC_REQBUFS, &req) == -1) {
if (errno == EINVAL) {
fprintf(stderr, "%s does not support memory mapping",
dev_name);
exit(EXIT_FAILURE);
} else {
errno_exit("VIDIOC_REQBUFS");
}
}
if (req.count < 2) {
fprintf(stderr, "Insufficient buffer memory on %s\n",
dev_name);
exit(EXIT_FAILURE);
}
buffers = calloc(req.count, sizeof(buffers[0]));
if (!buffers) {
fprintf(stderr, "Out of memory\\n");
exit(EXIT_FAILURE);
}
for (n_buffers = 0; n_buffers < req.count; ++n_buffers) {
struct v4l2_buffer buf = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.memory = V4L2_MEMORY_MMAP,
.index = n_buffers,
};
if (xioctl(fd, VIDIOC_QUERYBUF, &buf) == -1) {
errno_exit("VIDIOC_QUERYBUF");
}
buffers[n_buffers].length = buf.length;
buffers[n_buffers].start = 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");
}
}
}
static int
v4l2_ctrl_set(int fd, uint32_t id, int val)
{
struct v4l2_control ctrl = {0};
ctrl.id = id;
ctrl.value = val;
if (xioctl(fd, VIDIOC_S_CTRL, &ctrl) == -1) {
g_printerr("Failed to set control %d to %d\n", id, val);
return -1;
}
return 0;
}
static void
init_sensor(char *fn, int width, int height, int mbus, int rate)
{
int fd;
struct v4l2_subdev_frame_interval interval;
struct v4l2_subdev_format fmt;
fd = open(fn, O_RDWR);
g_printerr("Setting sensor rate to %d\n", rate);
interval.pad = 0;
interval.interval.numerator = 1;
interval.interval.denominator = rate;
if (xioctl(fd, VIDIOC_SUBDEV_S_FRAME_INTERVAL, &interval) == -1) {
errno_exit("VIDIOC_SUBDEV_S_FRAME_INTERVAL");
}
g_printerr("Driver returned %d/%d frameinterval\n",
interval.interval.numerator, interval.interval.denominator);
g_printerr("Setting sensor to %dx%d fmt %d\n",
width, height, mbus);
fmt.pad = 0;
fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
fmt.format.code = mbus;
fmt.format.width = width;
fmt.format.height = height;
fmt.format.field = V4L2_FIELD_ANY;
if (xioctl(fd, VIDIOC_SUBDEV_S_FMT, &fmt) == -1) {
errno_exit("VIDIOC_SUBDEV_S_FMT");
}
g_printerr("Driver returned %dx%d fmt %d\n",
fmt.format.width, fmt.format.height,
fmt.format.code);
// Placeholder, default is also 1
//v4l2_ctrl_set(fd, V4L2_CID_AUTOGAIN, 1);
close(current_fd);
current_fd = fd;
}
static int
init_device(int fd)
{
struct v4l2_capability cap;
if (xioctl(fd, VIDIOC_QUERYCAP, &cap) == -1) {
if (errno == EINVAL) {
fprintf(stderr, "%s is no V4L2 device\n",
dev_name);
exit(EXIT_FAILURE);
} else {
errno_exit("VIDIOC_QUERYCAP");
}
}
if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
fprintf(stderr, "%s is no video capture device\n",
dev_name);
exit(EXIT_FAILURE);
}
if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
fprintf(stderr, "%s does not support streaming i/o\n",
dev_name);
exit(EXIT_FAILURE);
}
/* Select video input, video standard and tune here. */
struct v4l2_cropcap cropcap = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
};
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;
}
}
} else {
/* Errors ignored. */
}
struct v4l2_format fmt = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
};
if (current_width > 0) {
g_printerr("Setting camera to %dx%d fmt %d\n",
current_width, current_height, current_fmt);
fmt.fmt.pix.width = current_width;
fmt.fmt.pix.height = current_height;
fmt.fmt.pix.pixelformat = current_fmt;
fmt.fmt.pix.field = V4L2_FIELD_ANY;
if (xioctl(fd, VIDIOC_S_FMT, &fmt) == -1) {
g_printerr("VIDIOC_S_FMT failed");
show_error("Could not set camera mode");
return -1;
}
g_printerr("Driver returned %dx%d fmt %d\n",
fmt.fmt.pix.width, fmt.fmt.pix.height,
fmt.fmt.pix.pixelformat);
/* Note VIDIOC_S_FMT may change width and height. */
} else {
g_printerr("Querying camera format\n");
/* Preserve original settings as set by v4l2-ctl for example */
if (xioctl(fd, VIDIOC_G_FMT, &fmt) == -1) {
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);
current_width = fmt.fmt.pix.width;
current_height = fmt.fmt.pix.height;
}
current_fmt = fmt.fmt.pix.pixelformat;
/* Buggy driver paranoia. */
unsigned int min = fmt.fmt.pix.width * 2;
if (fmt.fmt.pix.bytesperline < min) {
fmt.fmt.pix.bytesperline = min;
}
min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
if (fmt.fmt.pix.sizeimage < min) {
fmt.fmt.pix.sizeimage = min;
}
init_mmap(fd);
return 0;
}
static void
process_image(const int *p, int size)
{
clock_t t;
time_t rawtime;
struct tm tim;
uint8_t *pixels;
double time_taken;
char fname[255];
char timestamp[30];
GdkPixbuf *pixbuf;
GdkPixbuf *pixbufrot;
GError *error = NULL;
double scale;
cairo_t *cr;
t = clock();
int skip = 2;
dc1394bayer_method_t method = DC1394_BAYER_METHOD_DOWNSAMPLE;
dc1394color_filter_t filter = DC1394_COLOR_FILTER_BGGR;
if (capture) {
method = DC1394_BAYER_METHOD_SIMPLE;
// method = DC1394_BAYER_METHOD_VNG is slightly sharper but takes 10 seconds;
pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, FALSE, 8, current_width, current_height);
pixels = gdk_pixbuf_get_pixels(pixbuf);
dc1394_bayer_decoding_8bit((const uint8_t *) p, pixels, current_width, current_height, filter, method);
} else {
if(current_width > 1280) {
skip = 3;
}
pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, FALSE, 8, current_width / (skip*2), current_height / (skip*2));
pixels = gdk_pixbuf_get_pixels(pixbuf);
quick_debayer_bggr8((const uint8_t *)p, pixels, current_width, current_height, skip);
}
if (current_rotate == 0) {
pixbufrot = pixbuf;
} else if (current_rotate == 90) {
pixbufrot = gdk_pixbuf_rotate_simple(pixbuf, GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE);
} else if (current_rotate == 180) {
pixbufrot = gdk_pixbuf_rotate_simple(pixbuf, GDK_PIXBUF_ROTATE_UPSIDEDOWN);
} else if (current_rotate == 270) {
pixbufrot = gdk_pixbuf_rotate_simple(pixbuf, GDK_PIXBUF_ROTATE_CLOCKWISE);
}
if (capture) {
time(&rawtime);
tim = *(localtime(&rawtime));
strftime(timestamp, 30, "%Y%m%d%H%M%S", &tim);
sprintf(fname, "%s/Pictures/IMG%s.jpg", getenv("HOME"), timestamp);
printf("Saving image\n");
gdk_pixbuf_save(pixbufrot, fname, "jpeg", &error, "quality", "95", NULL);
if (error != NULL) {
g_printerr("%s\n", error->message);
g_clear_error(&error);
}
} else {
scale = (double) preview_width / gdk_pixbuf_get_width(pixbufrot);
cr = cairo_create(surface);
cairo_set_source_rgb(cr, 0, 0, 0);
cairo_paint(cr);
cairo_scale(cr, scale, scale);
gdk_cairo_set_source_pixbuf(cr, pixbufrot, 0, 0);
cairo_pattern_set_extend(cairo_get_source(cr), CAIRO_EXTEND_NONE);
cairo_paint(cr);
gtk_widget_queue_draw_area(preview, 0, 0, preview_width, preview_height);
}
capture = 0;
t = clock() - t;
time_taken = ((double) t) / CLOCKS_PER_SEC;
//printf("%f fps\n", 1.0 / time_taken);
}
static gboolean
preview_draw(GtkWidget *widget, cairo_t *cr, gpointer data)
{
cairo_set_source_surface(cr, surface, 0, 0);
cairo_paint(cr);
return FALSE;
}
static gboolean
preview_configure(GtkWidget *widget, GdkEventConfigure *event)
{
cairo_t *cr;
if (surface)
cairo_surface_destroy(surface);
surface = gdk_window_create_similar_surface(gtk_widget_get_window(widget),
CAIRO_CONTENT_COLOR,
gtk_widget_get_allocated_width(widget),
gtk_widget_get_allocated_height(widget));
preview_width = gtk_widget_get_allocated_width(widget);
preview_height = gtk_widget_get_allocated_height(widget);
cr = cairo_create(surface);
cairo_set_source_rgb(cr, 0, 0, 0);
cairo_paint(cr);
cairo_destroy(cr);
return TRUE;
}
static int
read_frame(int fd)
{
struct v4l2_buffer buf = {0};
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);
process_image(buffers[buf.index].start, buf.bytesused);
if (xioctl(fd, VIDIOC_QBUF, &buf) == -1) {
errno_exit("VIDIOC_QBUF");
}
return 1;
}
gboolean
get_frame()
{
if (ready == 0)
return TRUE;
while (1) {
fd_set fds;
struct timeval tv;
int r;
FD_ZERO(&fds);
FD_SET(video_fd, &fds);
/* Timeout. */
tv.tv_sec = 2;
tv.tv_usec = 0;
r = select(video_fd + 1, &fds, NULL, NULL, &tv);
if (r == -1) {
if (EINTR == errno) {
continue;
}
errno_exit("select");
} else if (r == 0) {
fprintf(stderr, "select timeout\\n");
exit(EXIT_FAILURE);
}
if (read_frame(video_fd)) {
break;
}
/* EAGAIN - continue select loop. */
}
return TRUE;
}
int
strtoint(const char *nptr, char **endptr, int base)
{
long x = strtol(nptr, endptr, base);
assert(x <= INT_MAX);
return (int) x;
}
static int
config_ini_handler(void *user, const char *section, const char *name,
const char *value)
{
if (strcmp(section, "rear") == 0) {
if (strcmp(name, "width") == 0) {
rear_width = strtoint(value, NULL, 10);
} else if (strcmp(name, "height") == 0) {
rear_height = strtoint(value, NULL, 10);
} else if (strcmp(name, "rate") == 0) {
rear_rate = strtoint(value, NULL, 10);
} else if (strcmp(name, "rotate") == 0) {
rear_rotate = strtoint(value, NULL, 10);
} else if (strcmp(name, "fmt") == 0) {
if (strcmp(value, "RGB") == 0) {
rear_fmt = V4L2_PIX_FMT_RGB24;
} else if (strcmp(value, "UYVY") == 0) {
rear_fmt = V4L2_PIX_FMT_UYVY;
} else if (strcmp(value, "YUYV") == 0) {
rear_fmt = V4L2_PIX_FMT_YUYV;
} else if (strcmp(value, "JPEG") == 0) {
rear_fmt = V4L2_PIX_FMT_JPEG;
} else if (strcmp(value, "NV12") == 0) {
rear_fmt = V4L2_PIX_FMT_NV12;
} else if (strcmp(value, "YUV420") == 0
|| strcmp(value, "I420") == 0
|| strcmp(value, "YU12") == 0) {
rear_fmt = V4L2_PIX_FMT_YUV420;
} else if (strcmp(value, "YVU420") == 0
|| strcmp(value, "YV12") == 0) {
rear_fmt = V4L2_PIX_FMT_YVU420;
} else if (strcmp(value, "RGGB8") == 0) {
rear_fmt = V4L2_PIX_FMT_SRGGB8;
} else if (strcmp(value, "BGGR8") == 0) {
rear_fmt = V4L2_PIX_FMT_SBGGR8;
rear_mbus = MEDIA_BUS_FMT_SBGGR8_1X8;
} else if (strcmp(value, "GRBG8") == 0) {
rear_fmt = V4L2_PIX_FMT_SGRBG8;
} else if (strcmp(value, "GBRG8") == 0) {
rear_fmt = V4L2_PIX_FMT_SGBRG8;
} else {
g_printerr("Unsupported pixelformat %s\n", value);
exit(1);
}
} else if (strcmp(name, "driver") == 0) {
rear_dev_name = strdup(value);
} else {
g_printerr("Unknown key '%s' in [rear]\n", name);
exit(1);
}
} else if (strcmp(section, "front") == 0) {
if (strcmp(name, "width") == 0) {
front_width = strtoint(value, NULL, 10);
} else if (strcmp(name, "height") == 0) {
front_height = strtoint(value, NULL, 10);
} else if (strcmp(name, "rate") == 0) {
front_rate = strtoint(value, NULL, 10);
} else if (strcmp(name, "rotate") == 0) {
front_rotate = strtoint(value, NULL, 10);
} else if (strcmp(name, "fmt") == 0) {
if (strcmp(value, "RGB") == 0) {
front_fmt = V4L2_PIX_FMT_RGB24;
} else if (strcmp(value, "UYVY") == 0) {
front_fmt = V4L2_PIX_FMT_UYVY;
} else if (strcmp(value, "YUYV") == 0) {
front_fmt = V4L2_PIX_FMT_YUYV;
} else if (strcmp(value, "JPEG") == 0) {
front_fmt = V4L2_PIX_FMT_JPEG;
} else if (strcmp(value, "NV12") == 0) {
front_fmt = V4L2_PIX_FMT_NV12;
} else if (strcmp(value, "YUV420") == 0
|| strcmp(value, "I420") == 0
|| strcmp(value, "YU12") == 0) {
front_fmt = V4L2_PIX_FMT_YUV420;
} else if (strcmp(value, "YVU420") == 0
|| strcmp(value, "YV12") == 0) {
front_fmt = V4L2_PIX_FMT_YVU420;
} else if (strcmp(value, "RGGB8") == 0) {
front_fmt = V4L2_PIX_FMT_SRGGB8;
} else if (strcmp(value, "BGGR8") == 0) {
front_fmt = V4L2_PIX_FMT_SBGGR8;
front_mbus = MEDIA_BUS_FMT_SBGGR8_1X8;
} else if (strcmp(value, "GRBG8") == 0) {
front_fmt = V4L2_PIX_FMT_SGRBG8;
} else if (strcmp(value, "GBRG8") == 0) {
front_fmt = V4L2_PIX_FMT_SGBRG8;
} else {
g_printerr("Unsupported pixelformat %s\n", value);
exit(1);
}
} else if (strcmp(name, "driver") == 0) {
front_dev_name = strdup(value);
} else {
g_printerr("Unknown key '%s' in [front]\n", name);
exit(1);
}
} else if (strcmp(section, "device") == 0) {
if (strcmp(name, "csi") == 0) {
media_drv_name = strdup(value);
} else {
g_printerr("Unknown key '%s' in [device]\n", name);
exit(1);
}
} else {
g_printerr("Unknown section '%s' in config file\n", section);
exit(1);
}
return 1;
}
int
find_dev_node(int maj, int min, char *fnbuf)
{
DIR *d;
struct dirent *dir;
struct stat info;
d = opendir("/dev");
while ((dir = readdir(d)) != NULL) {
sprintf(fnbuf, "/dev/%s", dir->d_name);
stat(fnbuf, &info);
if (!S_ISCHR(info.st_mode)) {
continue;
}
if (major(info.st_rdev) == maj && minor(info.st_rdev) == min) {
return 0;
}
}
return -1;
}
int
setup_rear()
{
struct media_link_desc link = {0};
// Disable the interface<->front link
link.flags = 0;
link.source.entity = front_entity_id;
link.source.index = 0;
link.sink.entity = interface_entity_id;
link.sink.index = 0;
if (xioctl(media_fd, MEDIA_IOC_SETUP_LINK, &link) < 0) {
g_printerr("Could not disable front camera link\n");
return -1;
}
// Enable the interface<->rear link
link.flags = MEDIA_LNK_FL_ENABLED;
link.source.entity = rear_entity_id;
link.source.index = 0;
link.sink.entity = interface_entity_id;
link.sink.index = 0;
if (xioctl(media_fd, MEDIA_IOC_SETUP_LINK, &link) < 0) {
g_printerr("Could not enable rear camera link\n");
return -1;
}
current_width = rear_width;
current_height = rear_height;
current_fmt = rear_fmt;
current_rotate = rear_rotate;
// Find camera node
init_sensor(rear_dev, rear_width, rear_height, rear_mbus, rear_rate);
return 0;
}
int
setup_front()
{
struct media_link_desc link = {0};
// Disable the interface<->rear link
link.flags = 0;
link.source.entity = rear_entity_id;
link.source.index = 0;
link.sink.entity = interface_entity_id;
link.sink.index = 0;
if (xioctl(media_fd, MEDIA_IOC_SETUP_LINK, &link) < 0) {
g_printerr("Could not disable rear camera link\n");
return -1;
}
// Enable the interface<->rear link
link.flags = MEDIA_LNK_FL_ENABLED;
link.source.entity = front_entity_id;
link.source.index = 0;
link.sink.entity = interface_entity_id;
link.sink.index = 0;
if (xioctl(media_fd, MEDIA_IOC_SETUP_LINK, &link) < 0) {
g_printerr("Could not enable front camera link\n");
return -1;
}
current_width = front_width;
current_height = front_height;
current_fmt = front_fmt;
current_rotate = front_rotate;
// Find camera node
init_sensor(front_dev, front_width, front_height, front_mbus, front_rate);
return 0;
}
int
find_cameras()
{
struct media_entity_desc entity = {0};
int ret;
int found = 0;
while (1) {
entity.id = entity.id | MEDIA_ENT_ID_FLAG_NEXT;
ret = xioctl(media_fd, MEDIA_IOC_ENUM_ENTITIES, &entity);
if (ret < 0) {
break;
}
printf("At node %s, (0x%x)\n", entity.name, entity.type);
if (strncmp(entity.name, front_dev_name, strlen(front_dev_name)) == 0) {
front_entity_id = entity.id;
find_dev_node(entity.dev.major, entity.dev.minor, front_dev);
printf("Found front cam, is %s at %s\n", entity.name, front_dev);
found++;
}
if (strncmp(entity.name, rear_dev_name, strlen(rear_dev_name)) == 0) {
rear_entity_id = entity.id;
find_dev_node(entity.dev.major, entity.dev.minor, rear_dev);
printf("Found rear cam, is %s at %s\n", entity.name, rear_dev);
found++;
}
if (entity.type == MEDIA_ENT_F_IO_V4L) {
interface_entity_id = entity.id;
find_dev_node(entity.dev.major, entity.dev.minor, dev_name);
printf("Found v4l2 interface node at %s\n", dev_name);
}
}
if (found < 2) {
return -1;
}
return 0;
}
int
find_media_fd()
{
DIR *d;
struct dirent *dir;
int fd;
char fnbuf[261];
struct media_device_info mdi = {0};
d = opendir("/dev");
while ((dir = readdir(d)) != NULL) {
if (strncmp(dir->d_name, "media", 5) == 0) {
sprintf(fnbuf, "/dev/%s", dir->d_name);
printf("Checking %s\n", fnbuf);
fd = open(fnbuf, O_RDWR);
xioctl(fd, MEDIA_IOC_DEVICE_INFO, &mdi);
printf("Found media device: %s\n", mdi.driver);
if (strcmp(mdi.driver, media_drv_name) == 0) {
media_fd = fd;
return 0;
}
close(fd);
}
}
return 1;
}
void
on_shutter_clicked(GtkWidget *widget, gpointer user_data)
{
capture = 1;
}
void
on_error_close_clicked(GtkWidget *widget, gpointer user_data)
{
gtk_widget_hide(error_box);
}
void
on_camera_switch_clicked(GtkWidget *widget, gpointer user_data)
{
stop_capturing(video_fd);
close(current_fd);
if (current_is_rear == 1) {
setup_front();
current_is_rear = 0;
} else {
setup_rear();
current_is_rear = 1;
}
close(video_fd);
video_fd = open(dev_name, O_RDWR);
if (video_fd == -1) {
g_printerr("Error opening video device: %s\n", dev_name);
return;
}
init_device(video_fd);
start_capturing(video_fd);
}
int
find_config(char *conffile)
{
char buf[512];
char *xdg_config_home;
wordexp_t exp_result;
FILE *fp;
// Resolve XDG stuff
if ((xdg_config_home = getenv("XDG_CONFIG_HOME")) == NULL) {
xdg_config_home = "~/.config";
}
wordexp(xdg_config_home, &exp_result, 0);
xdg_config_home = strdup(exp_result.we_wordv[0]);
wordfree(&exp_result);
if(access("/proc/device-tree/compatible", F_OK) != -1) {
// Reads to compatible string of the current device tree, looks like:
// pine64,pinephone-1.2\0allwinner,sun50i-a64\0
fp = fopen("/proc/device-tree/compatible", "r");
fgets(buf, 512, fp);
fclose(fp);
// Check for a config file in XDG_CONFIG_HOME
sprintf(conffile, "%s/megapixels/config/%s.ini", xdg_config_home, buf);
if(access(conffile, F_OK) != -1) {
printf("Found config file at %s\n", conffile);
return 0;
}
// Check user overridden /etc/megapixels/config/$dt.ini
sprintf(conffile, "%s/megapixels/config/%s.ini", SYSCONFDIR, buf);
if(access(conffile, F_OK) != -1) {
printf("Found config file at %s\n", conffile);
return 0;
}
// Check packaged /usr/share/megapixels/config/$dt.ini
sprintf(conffile, "%s/megapixels/config/%s.ini", DATADIR, buf);
if(access(conffile, F_OK) != -1) {
printf("Found config file at %s\n", conffile);
return 0;
}
// Check config/%dt.ini in the current working directory
sprintf(conffile, "config/%s.ini", buf);
if(access(conffile, F_OK) != -1) {
printf("Found config file at %s\n", conffile);
return 0;
}
printf("%s not found\n", conffile);
} else {
printf("Could not read device name from device tree\n");
}
// If all else fails, fall back to /etc/megapixels.ini
conffile = "/etc/megapixels.ini";
if(access(conffile, F_OK) != -1) {
printf("Found config file at %s\n", conffile);
return 0;
}
return -1;
}
int
main(int argc, char *argv[])
{
char conffile[512];
find_config(conffile);
gtk_init(&argc, &argv);
g_object_set(gtk_settings_get_default(), "gtk-application-prefer-dark-theme", TRUE, NULL);
GtkBuilder *builder = gtk_builder_new_from_resource("/org/postmarketos/Megapixels/camera.glade");
GtkWidget *window = GTK_WIDGET(gtk_builder_get_object(builder, "window"));
GtkWidget *preview_box = GTK_WIDGET(gtk_builder_get_object(builder, "preview_box"));
GtkWidget *shutter = GTK_WIDGET(gtk_builder_get_object(builder, "shutter"));
GtkWidget *switch_btn = GTK_WIDGET(gtk_builder_get_object(builder, "switch_camera"));
GtkWidget *settings_btn = GTK_WIDGET(gtk_builder_get_object(builder, "settings"));
GtkWidget *error_close = GTK_WIDGET(gtk_builder_get_object(builder, "error_close"));
preview = GTK_WIDGET(gtk_builder_get_object(builder, "preview"));
error_box = GTK_WIDGET(gtk_builder_get_object(builder, "error_box"));
error_message = GTK_WIDGET(gtk_builder_get_object(builder, "error_message"));
g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
g_signal_connect(shutter, "clicked", G_CALLBACK(on_shutter_clicked), NULL);
g_signal_connect(error_close, "clicked", G_CALLBACK(on_error_close_clicked), NULL);
g_signal_connect(switch_btn, "clicked", G_CALLBACK(on_camera_switch_clicked), NULL);
g_signal_connect(preview, "draw", G_CALLBACK(preview_draw), NULL);
g_signal_connect(preview, "configure-event", G_CALLBACK(preview_configure), NULL);
GtkCssProvider *provider = gtk_css_provider_new();
if (access("camera.css", F_OK) != -1) {
gtk_css_provider_load_from_path(provider, "camera.css", NULL);
} else {
gtk_css_provider_load_from_resource(provider, "/org/postmarketos/Megapixels/camera.css");
}
GtkStyleContext *context = gtk_widget_get_style_context(preview_box);
gtk_style_context_add_provider(context,
GTK_STYLE_PROVIDER(provider),
GTK_STYLE_PROVIDER_PRIORITY_USER);
context = gtk_widget_get_style_context(error_box);
gtk_style_context_add_provider(context,
GTK_STYLE_PROVIDER(provider),
GTK_STYLE_PROVIDER_PRIORITY_USER);
int result = ini_parse(conffile, config_ini_handler, NULL);
if (result == -1) {
g_printerr("Config file not found\n");
return 1;
} else if (result == -2) {
g_printerr("Could not allocate memory to parse config file\n");
return 1;
} else if (result != 0) {
g_printerr("Could not parse config file\n");
return 1;
}
if (find_media_fd() == -1) {
g_printerr("Could not find the media node\n");
show_error("Could not find the media node");
goto failed;
}
if (find_cameras() == -1) {
g_printerr("Could not find the cameras\n");
show_error("Could not find the cameras");
goto failed;
}
setup_rear();
int fd = open(dev_name, O_RDWR);
if (fd == -1) {
g_printerr("Error opening video device: %s\n", dev_name);
show_error("Error opening the video device");
goto failed;
}
video_fd = fd;
if(init_device(fd) < 0){
goto failed;
}
start_capturing(fd);
failed:
printf("window show\n");
gtk_widget_show(window);
g_idle_add((GSourceFunc)get_frame, NULL);
gtk_main();
return 0;
}