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-rw-r--r--include/media/v4l2-common.h34
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.