SCAN_VERT         952 libavcodec/hevc.c                 scan_idx = SCAN_VERT;
SCAN_VERT         960 libavcodec/hevc.c                 scan_idx_c = SCAN_VERT;
SCAN_VERT        1200 libavcodec/hevc_cabac.c     if (scan_idx == SCAN_VERT)