158     if (fs->is_used & 1) {  in unmark_for_reference()
164     if (fs->is_used & 2) {  in unmark_for_reference()
170     if (fs->is_used == 3) {  in unmark_for_reference()
185     if (fs->is_used == 3) { // frame  in is_short_term_reference()
191     if (fs->is_used & 1) { // top field  in is_short_term_reference()
199     if (fs->is_used & 2) { // bottom field  in is_short_term_reference()
212     if (fs->is_used == 3) { // frame  in is_long_term_reference()
218     if (fs->is_used & 1) { // top field  in is_long_term_reference()
226     if (fs->is_used & 2) { // bottom field  in is_long_term_reference()
238     if (fs->is_used & 1) {  in unmark_for_long_term_reference()
244     if (fs->is_used & 2) {  in unmark_for_long_term_reference()
250     if (fs->is_used == 3) {  in unmark_for_long_term_reference()
285                     if (p_Dpb->fs_ref[i]->is_used == 3) {  in mm_unmark_short_term_for_reference()
295                     if (p_Dpb->fs_ref[i]->is_used == 3) {  in mm_unmark_short_term_for_reference()
323                     if (p_Dpb->fs_ltref[i]->is_used == 3) {  in mm_unmark_long_term_for_reference()
336                     if (p_Dpb->fs_ltref[i]->is_used == 3) {  in mm_unmark_long_term_for_reference()
608     if (fs->is_used == 3) { // frame  in is_used_for_reference()
614     if (fs->is_used & 1) { // top field  in is_used_for_reference()
622     if (fs->is_used & 2) { // bottom field  in is_used_for_reference()
664     switch (fs->is_used) {  in remove_frame_from_dpb()
688     fs->is_used = 0;  in remove_frame_from_dpb()
765     f->is_used = 0;  in alloc_frame_store()
795         } else if (fs->is_used == 0x01) { // unpaired, have top  in dpb_combine_field_yuv()
798         } else if (fs->is_used == 0x02) { // unpaired, have bottom  in dpb_combine_field_yuv()
802             ASSERT(fs->is_used == 0x03);  in dpb_combine_field_yuv()
950     VAL_CHECK(ret, fs->is_used < 3);  in write_unpaired_field()
951     if (fs->is_used & 0x01) { // we have a top field, construct an empty bottom field  in write_unpaired_field()
964     if (fs->is_used & 0x02) { // we have a bottom field, construct an empty top field  in write_unpaired_field()
983     fs->is_used = 3;  in write_unpaired_field()
1001     p_Vid->out_buffer.is_used = 0;  in flush_direct_output()
1016     if (fs->is_used < 3) {  in write_stored_frame()
1257         p_Vid->out_buffer.is_used = 0;  in direct_output()
1263         if (p_Vid->out_buffer.is_used & 1) {  in direct_output()
1267         p_Vid->out_buffer.is_used |= 1;  in direct_output()
1274         if (p_Vid->out_buffer.is_used & 2) {  in direct_output()
1278         p_Vid->out_buffer.is_used |= 2;  in direct_output()
1284     if (p_Vid->out_buffer.is_used == 3) {  in direct_output()
1296         p_Vid->out_buffer.is_used = 0;  in direct_output()
1370     if (fs->is_used == 3) {  in scan_dpb_output()
1713         fs->is_used = 3;  in insert_picture_in_dpb()
1729         fs->is_used |= 1;  in insert_picture_in_dpb()
1740         if (fs->is_used == 3) {  in insert_picture_in_dpb()
1748         fs->is_used |= 2;  in insert_picture_in_dpb()
1759         if (fs->is_used == 3) {  in insert_picture_in_dpb()
1841                 if (((p->structure == TOP_FIELD) && (p_last->is_used == 2))  in get_field_dpb_combine_flag()
1842                     || ((p->structure == BOTTOM_FIELD) && (p_last->is_used == 1))) {  in get_field_dpb_combine_flag()