1 files changed, 34 insertions, 0 deletions
diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
index f3aa1d728c0b..38947dc42ab6 100644
--- a/include/media/v4l2-common.h
+++ b/include/media/v4l2-common.h
@@ -333,6 +333,40 @@ v4l2_find_nearest_format(const struct v4l2_frmsize_discrete *sizes,
 			  s32 width, s32 height);
 
 /**
+ * v4l2_find_nearest_size - Find the nearest size among a discrete
+ *	set of resolutions contained in an array of a driver specific struct.
+ *
+ * @array: a driver specific array of image sizes
+ * @array_size: the length of the driver specific array of image sizes
+ * @width_field: the name of the width field in the driver specific struct
+ * @height_field: the name of the height field in the driver specific struct
+ * @width: desired width.
+ * @height: desired height.
+ *
+ * Finds the closest resolution to minimize the width and height differences
+ * between what requested and the supported resolutions. The size of the width
+ * and height fields in the driver specific must equal to that of u32, i.e. four
+ * bytes.
+ *
+ * Returns the best match or NULL if the length of the array is zero.
+ */
+#define v4l2_find_nearest_size(array, array_size, width_field, height_field, \
+			       width, height)				\
+	({								\
+		BUILD_BUG_ON(sizeof((array)->width_field) != sizeof(u32) || \
+			     sizeof((array)->height_field) != sizeof(u32)); \
+		(typeof(&(*(array))))__v4l2_find_nearest_size(		\
+			(array), array_size, sizeof(*(array)),		\
+			offsetof(typeof(*(array)), width_field),	\
+			offsetof(typeof(*(array)), height_field),	\
+			width, height);					\
+	})
+const void *
+__v4l2_find_nearest_size(const void *array, size_t array_size,
+			 size_t entry_size, size_t width_offset,
+			 size_t height_offset, s32 width, s32 height);
+
+/**
  * v4l2_get_timestamp - helper routine to get a timestamp to be used when
  *	filling streaming metadata. Internally, it uses ktime_get_ts(),
  *	which is the recommended way to get it.