h264_mb: constify block_offset

It is read-only in this code.

libavcodec/h264_mb.c

@@ -616,7 +616,7 @@ static av_always_inline void hl_decode_mb_predict_luma(H264Context *h,
                                                        int simple,
                                                        int transform_bypass,
                                                        int pixel_shift,
-                                                       int *block_offset,
+                                                       const int *block_offset,
                                                        int linesize,
                                                        uint8_t *dest_y, int p)
 {
@@ -732,7 +732,7 @@ static av_always_inline void hl_decode_mb_idct_luma(H264Context *h, H264SliceCon
                                                     int is_h264, int simple,
                                                     int transform_bypass,
                                                     int pixel_shift,
-                                                    int *block_offset,
+                                                    const int *block_offset,
                                                     int linesize,
                                                     uint8_t *dest_y, int p)
 {

libavcodec/h264_mb_template.c

@@ -49,7 +49,7 @@ static av_noinline void FUNC(hl_decode_mb)(H264Context *h, H264SliceContext *sl)
     uint8_t *dest_y, *dest_cb, *dest_cr;
     int linesize, uvlinesize /*dct_offset*/;
     int i, j;
-    int *block_offset = &h->block_offset[0];
+    const int *block_offset = &h->block_offset[0];
     const int transform_bypass = !SIMPLE && (sl->qscale == 0 && h->sps.transform_bypass);
     /* is_h264 should always be true if SVQ3 is disabled. */
     const int is_h264 = !CONFIG_SVQ3_DECODER || SIMPLE || h->avctx->codec_id == AV_CODEC_ID_H264;
@@ -281,7 +281,7 @@ static av_noinline void FUNC(hl_decode_mb_444)(H264Context *h, H264SliceContext
     uint8_t *dest[3];
     int linesize;
     int i, j, p;
-    int *block_offset = &h->block_offset[0];
+    const int *block_offset = &h->block_offset[0];
     const int transform_bypass = !SIMPLE && (sl->qscale == 0 && h->sps.transform_bypass);
     const int plane_count      = (SIMPLE || !CONFIG_GRAY || !(h->flags & CODEC_FLAG_GRAY)) ? 3 : 1;