diff --git a/doc/APIchanges b/doc/APIchanges
index 6eefc7fc33..28cc0344ad 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -14,6 +14,9 @@ libavutil:     2021-04-27
 
 API changes, most recent first:
 
+2021-08-14 - xxxxxxxxxx - lavu 57.4.100 - imgutils.h
+  Add av_image_copy_plane_uc_from()
+
 2021-08-02 - xxxxxxxxxx - lavc 59.4.100 - packet.h
   Add AVPacket.opaque, AVPacket.opaque_ref, AVPacket.time_base.
 
diff --git a/libavutil/imgutils.c b/libavutil/imgutils.c
index 6c32a71cc5..9ab5757cf6 100644
--- a/libavutil/imgutils.c
+++ b/libavutil/imgutils.c
@@ -356,9 +356,9 @@ static void image_copy_plane(uint8_t       *dst, ptrdiff_t dst_linesize,
     }
 }
 
-static void image_copy_plane_uc_from(uint8_t       *dst, ptrdiff_t dst_linesize,
-                                     const uint8_t *src, ptrdiff_t src_linesize,
-                                     ptrdiff_t bytewidth, int height)
+void av_image_copy_plane_uc_from(uint8_t *dst, ptrdiff_t dst_linesize,
+                                 const uint8_t *src, ptrdiff_t src_linesize,
+                                 ptrdiff_t bytewidth, int height)
 {
     int ret = -1;
 
@@ -440,7 +440,7 @@ void av_image_copy_uc_from(uint8_t *dst_data[4], const ptrdiff_t dst_linesizes[4
                            enum AVPixelFormat pix_fmt, int width, int height)
 {
     image_copy(dst_data, dst_linesizes, src_data, src_linesizes, pix_fmt,
-               width, height, image_copy_plane_uc_from);
+               width, height, av_image_copy_plane_uc_from);
 }
 
 int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4],
diff --git a/libavutil/imgutils.h b/libavutil/imgutils.h
index 5eccbf0bf7..cb2d74728e 100644
--- a/libavutil/imgutils.h
+++ b/libavutil/imgutils.h
@@ -124,6 +124,24 @@ void av_image_copy_plane(uint8_t       *dst, int dst_linesize,
                          const uint8_t *src, int src_linesize,
                          int bytewidth, int height);
 
+/**
+ * Copy image data located in uncacheable (e.g. GPU mapped) memory. Where
+ * available, this function will use special functionality for reading from such
+ * memory, which may result in greatly improved performance compared to plain
+ * av_image_copy_plane().
+ *
+ * bytewidth must be contained by both absolute values of dst_linesize
+ * and src_linesize, otherwise the function behavior is undefined.
+ *
+ * @note The linesize parameters have the type ptrdiff_t here, while they are
+ *       int for av_image_copy_plane().
+ * @note On x86, the linesizes currently need to be aligned to the cacheline
+ *       size (i.e. 64) to get improved performance.
+ */
+void av_image_copy_plane_uc_from(uint8_t       *dst, ptrdiff_t dst_linesize,
+                                 const uint8_t *src, ptrdiff_t src_linesize,
+                                 ptrdiff_t bytewidth, int height);
+
 /**
  * Copy image in src_data to dst_data.
  *
diff --git a/libavutil/version.h b/libavutil/version.h
index 6b4a265457..201b012596 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -79,7 +79,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  57
-#define LIBAVUTIL_VERSION_MINOR   3
+#define LIBAVUTIL_VERSION_MINOR   4
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \