+static void decode_mb(MpegEncContext *s, int ref)
+{
+ s->dest[0] = s->current_picture.f.data[0] + (s->mb_y * 16 * s->linesize) + s->mb_x * 16;
+ s->dest[1] = s->current_picture.f.data[1] + (s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize) + s->mb_x * (16 >> s->chroma_x_shift);
+ s->dest[2] = s->current_picture.f.data[2] + (s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize) + s->mb_x * (16 >> s->chroma_x_shift);
+
+ if (CONFIG_H264_DECODER && s->codec_id == AV_CODEC_ID_H264) {
+ H264Context *h = (void*)s;
+ h->mb_xy = s->mb_x + s->mb_y * s->mb_stride;
+ memset(h->non_zero_count_cache, 0, sizeof(h->non_zero_count_cache));
+ assert(ref >= 0);
+ /* FIXME: It is possible albeit uncommon that slice references
+ * differ between slices. We take the easy approach and ignore
+ * it for now. If this turns out to have any relevance in
+ * practice then correct remapping should be added. */
+ if (ref >= h->ref_count[0])
+ ref = 0;
+ fill_rectangle(&s->current_picture.f.ref_index[0][4 * h->mb_xy],
+ 2, 2, 2, ref, 1);
+ fill_rectangle(&h->ref_cache[0][scan8[0]], 4, 4, 8, ref, 1);
+ fill_rectangle(h->mv_cache[0][scan8[0]], 4, 4, 8,
+ pack16to32(s->mv[0][0][0], s->mv[0][0][1]), 4);
+ assert(!FRAME_MBAFF);
+ ff_h264_hl_decode_mb(h);
+ } else {
+ assert(ref == 0);
+ ff_MPV_decode_mb(s, s->block);
+ }