avutil: make av_frame_get_plane_buffer accept a const AVFrame*

Signed-off-by: Niklas Haas <git@haasn.dev>

doc/APIchanges

@@ -2,6 +2,9 @@ The last version increases of all libraries were on 2023-02-09
 
 API changes, most recent first:
 
+2023-04-10 - xxxxxxxxxx - lavu 58.6.100 - frame.h
+  av_frame_get_plane_buffer() now accepts const AVFrame*.
+
 2023-04-04 - xxxxxxxxxx - lavu 58.6.100 - hdr_dynamic_metadata.h
   Add AV_HDR_PLUS_MAX_PAYLOAD_SIZE.
   av_dynamic_hdr_plus_create_side_data() now accepts a user provided

libavutil/frame.c

@@ -600,7 +600,7 @@ int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
     return frame_copy_props(dst, src, 1);
 }
 
-AVBufferRef *av_frame_get_plane_buffer(AVFrame *frame, int plane)
+AVBufferRef *av_frame_get_plane_buffer(const AVFrame *frame, int plane)
 {
     uint8_t *data;
     int planes;

libavutil/frame.h

@@ -901,7 +901,7 @@ int av_frame_copy_props(AVFrame *dst, const AVFrame *src);
  * @return the buffer reference that contains the plane or NULL if the input
  * frame is not valid.
  */
-AVBufferRef *av_frame_get_plane_buffer(AVFrame *frame, int plane);
+AVBufferRef *av_frame_get_plane_buffer(const AVFrame *frame, int plane);
 
 /**
  * Add a new side data to a frame.