hpeldsp: Explain why put_no_rnd_pixels_tab is larger than necessary

1 files changed, 2 insertions, 0 deletions

diff --git a/libavcodec/hpeldsp.h b/libavcodec/hpeldsp.h
index d037cba14e..62dee6813d 100644
--- a/libavcodec/hpeldsp.h
+++ b/libavcodec/hpeldsp.h
@@ -76,6 +76,8 @@ typedef struct HpelDSPContext {
      * @param pixels source
      * @param line_size number of bytes in a horizontal line of block
      * @param h height
+     * @note The size is kept at [4][4] to match the above pixel_tabs and avoid
+     *       out of bounds reads in the motion estimation code.
      */
     op_pixels_func put_no_rnd_pixels_tab[4][4];