Camera (Linux): init support

CMakeLists.txt

@@ -433,7 +433,7 @@ if(LINUX)
         src/detection/wm/wm_nosupport.c
         src/detection/de/de_linux.c
         src/detection/wmtheme/wmtheme_linux.c
-        src/detection/camera/camera_nosupport.c
+        src/detection/camera/camera_linux.c
         src/util/platform/FFPlatform_unix.c
     )
 elseif(ANDROID)

src/detection/camera/camera_linux.c

@@ -0,0 +1,46 @@
+#include "camera.h"
+#include "common/io/io.h"
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#if __has_include(<linux/videodev2.h>)
+    #include <linux/videodev2.h>
+#endif
+
+const char* ffDetectCamera(FFlist* result)
+{
+#if __has_include(<linux/videodev2.h>)
+    char path[] = "/dev/videoN";
+
+    for (uint32_t i = 0; i <= 9; ++i)
+    {
+        path[sizeof(path) - 2] = (char) (i + '0');
+        FF_AUTO_CLOSE_FD int fd = open(path, O_RDONLY);
+        if (fd < 0)
+            break;
+
+        struct v4l2_capability cap = {};
+        if (ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0 || !(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
+            continue;
+
+        struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
+        if (ioctl(fd, VIDIOC_G_FMT, &fmt) < 0)
+            continue;
+
+        FFCameraResult* camera = (FFCameraResult*) ffListAdd(result);
+        ffStrbufInitS(&camera->name, (const char*) cap.card);
+        ffStrbufInit(&camera->vendor);
+        ffStrbufInitS(&camera->id, (const char*) cap.bus_info);
+        camera->width = camera->height = 0;
+
+        camera->width = fmt.fmt.pix.width;
+        camera->height = fmt.fmt.pix.height;
+    }
+
+    return NULL;
+#else
+    return "Fastfetch was compiled without <linux/videodev2.h>";
+#endif
+}