+/**
+ * adds a slice.
+ * @param endx x component of the last macroblock, can be -1 for the last of the previous line
+ * @param status the status at the end (MV_END, AC_ERROR, ...), it is assumed that no earlier end or
+ * error of the same type occured
+ */
+void ff_er_add_slice(MpegEncContext *s, int startx, int starty, int endx, int endy, int status){
+ const int start_i= av_clip(startx + starty * s->mb_width , 0, s->mb_num-1);
+ const int end_i = av_clip(endx + endy * s->mb_width , 0, s->mb_num);
+ const int start_xy= s->mb_index2xy[start_i];
+ const int end_xy = s->mb_index2xy[end_i];
+ int mask= -1;
+
+ if(start_i > end_i || start_xy > end_xy){
+ av_log(s->avctx, AV_LOG_ERROR, "internal error, slice end before start\n");
+ return;
+ }
+
+ if(!s->error_resilience) return;
+
+ mask &= ~VP_START;
+ if(status & (AC_ERROR|AC_END)){
+ mask &= ~(AC_ERROR|AC_END);
+ s->error_count -= end_i - start_i + 1;
+ }
+ if(status & (DC_ERROR|DC_END)){
+ mask &= ~(DC_ERROR|DC_END);
+ s->error_count -= end_i - start_i + 1;
+ }
+ if(status & (MV_ERROR|MV_END)){
+ mask &= ~(MV_ERROR|MV_END);
+ s->error_count -= end_i - start_i + 1;
+ }
+
+ if(status & (AC_ERROR|DC_ERROR|MV_ERROR)) s->error_count= INT_MAX;
+
+ if(mask == ~0x7F){
+ memset(&s->error_status_table[start_xy], 0, (end_xy - start_xy) * sizeof(uint8_t));
+ }else{
+ int i;
+ for(i=start_xy; i<end_xy; i++){
+ s->error_status_table[ i ] &= mask;
+ }
+ }
+
+ if(end_i == s->mb_num)
+ s->error_count= INT_MAX;
+ else{
+ s->error_status_table[end_xy] &= mask;
+ s->error_status_table[end_xy] |= status;
+ }
+
+ s->error_status_table[start_xy] |= VP_START;
+
+ if(start_xy > 0 && s->avctx->thread_count <= 1 && s->avctx->skip_top*s->mb_width < start_i){
+ int prev_status= s->error_status_table[ s->mb_index2xy[start_i - 1] ];
+
+ prev_status &= ~ VP_START;
+ if(prev_status != (MV_END|DC_END|AC_END)) s->error_count= INT_MAX;
+ }
+}
+
+void ff_er_frame_end(MpegEncContext *s){
+ int i, mb_x, mb_y, error, error_type, dc_error, mv_error, ac_error;