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-rw-r--r--app/main.cpp4
-rw-r--r--app/utils.cpp47
-rw-r--r--app/utils.h3
3 files changed, 51 insertions, 3 deletions
diff --git a/app/main.cpp b/app/main.cpp
index fff9c4c..182489e 100644
--- a/app/main.cpp
+++ b/app/main.cpp
@@ -23,8 +23,6 @@
#include <gst/video/videooverlay.h>
#include <gst/wayland/wayland.h>
-#define DEFAULT_VIDEO_DEVICE "/dev/video0"
-
// these only applies if the window is a dialog/pop-up one
// by default the compositor make the window maximized
#define WINDOW_WIDTH_SIZE 640
@@ -669,7 +667,7 @@ int main(int argc, char *argv[])
memset(pipeline_str, 0, sizeof(pipeline_str));
snprintf(pipeline_str, sizeof(pipeline_str), "v4l2src device=%s ! video/x-raw,width=%d,height=%d ! waylandsink",
- DEFAULT_VIDEO_DEVICE, WINDOW_WIDTH_SIZE, WINDOW_HEIGHT_SIZE);
+ get_camera_device(), WINDOW_WIDTH_SIZE, WINDOW_HEIGHT_SIZE);
gst_init(&gargc, &gargv);
setbuf(stdout, NULL);
diff --git a/app/utils.cpp b/app/utils.cpp
index f1c3eae..1cf71f2 100644
--- a/app/utils.cpp
+++ b/app/utils.cpp
@@ -1,10 +1,16 @@
#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
+#include <dirent.h>
#include <assert.h>
#include <cstdlib>
#include <cstring>
#include <cerrno>
+#include <cstdio>
+#include <cctype>
+#include <linux/videodev2.h>
#include "utils.h"
@@ -148,3 +154,44 @@ os_create_anonymous_file(off_t size)
return fd;
}
+
+const char*
+get_camera_device(void)
+{
+ DIR *dir = opendir("/dev");
+ if (!dir) {
+ perror("Couldn't open the '/dev' directory");
+ return NULL;
+ }
+
+ static char device[PATH_MAX];
+ bool found = false;
+ while (struct dirent *dirent = readdir(dir)) {
+ if (strncmp(dirent->d_name, "video", strlen("video")))
+ continue;
+ if (!isdigit(dirent->d_name[strlen("video")]))
+ continue;
+
+ strcpy(device, "/dev/");
+ strncat(device, dirent->d_name, sizeof(device) - 1);
+
+ int fd = open(device, O_RDWR);
+ if (fd == -1)
+ continue;
+ struct v4l2_capability vid_cap;
+ if (ioctl(fd, VIDIOC_QUERYCAP, &vid_cap) < 0) {
+ close(fd);
+ continue;
+ }
+ close(fd);
+
+ if ((vid_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) ||
+ (vid_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE)) {
+ found = true;
+ break;
+ }
+ }
+
+ closedir(dir);
+ return found ? device : NULL;
+}
diff --git a/app/utils.h b/app/utils.h
index 99b2e30..8d6f0fd 100644
--- a/app/utils.h
+++ b/app/utils.h
@@ -8,6 +8,9 @@ extern "C" {
int
os_create_anonymous_file(off_t size);
+const char*
+get_camera_device(void);
+
#ifdef __cplusplus
}
#endif