avcodec/videodsp: Constify buf in VideoDSPContext.prefetch

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/libavcodec/videodsp.h b/libavcodec/videodsp.h
index b5219d236c..e8960b609d 100644
--- a/libavcodec/videodsp.h
+++ b/libavcodec/videodsp.h
@@ -72,7 +72,7 @@ typedef struct VideoDSPContext {
      * @param stride distance between two lines of buf (in bytes)
      * @param h      number of lines to prefetch
      */
-    void (*prefetch)(uint8_t *buf, ptrdiff_t stride, int h);
+    void (*prefetch)(const uint8_t *buf, ptrdiff_t stride, int h);
 } VideoDSPContext;
 
 void ff_videodsp_init(VideoDSPContext *ctx, int bpc);