avcodec/h264dec: Constify slices' pointer to the parent context

Modifying the main context by a slice thread is racy;
so constify the pointer to it in H264SliceContext.
The code itself was already compatible with this change.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/libavcodec/h264dec.h b/libavcodec/h264dec.h
index 0b9c5784a2..9a1ec1bace 100644
--- a/libavcodec/h264dec.h
+++ b/libavcodec/h264dec.h
@@ -168,7 +168,7 @@ typedef struct H264Ref {
 } H264Ref;
 
 typedef struct H264SliceContext {
-    struct H264Context *h264;
+    const struct H264Context *h264;
     GetBitContext gb;
     ERContext *er;