File linux-v4l2-device-path.patch of Package obs-studio

Common subdirectories: obs-studio-26.1.2/plugins/linux-v4l2/data and obs-studio-26.1.2-fixed/plugins/linux-v4l2/data
diff -u obs-studio-26.1.2/plugins/linux-v4l2/v4l2-input.c obs-studio-26.1.2-fixed/plugins/linux-v4l2/v4l2-input.c
--- obs-studio-26.1.2/plugins/linux-v4l2/v4l2-input.c	2021-01-09 00:43:39.000000000 +0100
+++ obs-studio-26.1.2-fixed/plugins/linux-v4l2/v4l2-input.c	2021-04-10 16:48:05.995426766 +0200
@@ -53,11 +53,11 @@
 #define timeval2ns(tv) \
 	(((uint64_t)tv.tv_sec * 1000000000) + ((uint64_t)tv.tv_usec * 1000))
 
-#define V4L2_FOURCC_STR(code)                                         \
-	(char[5])                                                     \
-	{                                                             \
-		code & 0xFF, (code >> 8) & 0xFF, (code >> 16) & 0xFF, \
-			(code >> 24) & 0xFF, 0                        \
+#define V4L2_FOURCC_STR(code)                                                 \
+	(char[5])                                                             \
+	{                                                                     \
+		(code >> 24) & 0xFF, (code >> 16) & 0xFF, (code >> 8) & 0xFF, \
+			code & 0xFF, 0                                        \
 	}
 
 #define blog(level, msg, ...) blog(level, "v4l2-input: " msg, ##__VA_ARGS__)
@@ -123,7 +123,7 @@
 	switch (data->pixfmt) {
 	case V4L2_PIX_FMT_NV12:
 		frame->linesize[0] = data->linesize;
-		frame->linesize[1] = data->linesize;
+		frame->linesize[1] = data->linesize / 2;
 		plane_offsets[1] = data->linesize * data->height;
 		break;
 	case V4L2_PIX_FMT_YVU420:
@@ -276,10 +276,12 @@
 	const char *cur_device_name;
 
 #ifdef __FreeBSD__
-	dirp = opendir("/dev");
+	const char *basedir = "/dev/";
 #else
-	dirp = opendir("/sys/class/video4linux");
+	const char *basedir = "/dev/v4l/by-path/";
 #endif
+
+	dirp = opendir(basedir);
 	if (!dirp)
 		return;
 
@@ -288,7 +290,7 @@
 
 	obs_property_list_clear(prop);
 
-	dstr_init_copy(&device, "/dev/");
+	dstr_init(&device);
 
 	while ((dp = readdir(dirp)) != NULL) {
 		int fd;
@@ -303,8 +305,16 @@
 		if (dp->d_type == DT_DIR)
 			continue;
 
-		dstr_resize(&device, 5);
-		dstr_cat(&device, dp->d_name);
+		char *dev_path = dp->d_name;
+
+		char buf[1024];
+		ssize_t len;
+		if ((len = readlink(dp->d_name, buf, sizeof(buf) - 1)) != -1) {
+			buf[len] = '\0';
+			dev_path = &buf[0];
+		}
+		dstr_copy(&device, basedir);
+		dstr_cat(&device, dev_path);
 
 		if ((fd = v4l2_open(device.array, O_RDWR | O_NONBLOCK)) == -1) {
 			blog(LOG_INFO, "Unable to open %s", device.array);