/* * H.26L/H.264/AVC/JVT/14496-10/... motion vector predicion * Copyright (c) 2003 Michael Niedermayer * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * H.264 / AVC / MPEG4 part10 motion vector predicion. * @author Michael Niedermayer */ #ifndef AVCODEC_H264_MVPRED_H #define AVCODEC_H264_MVPRED_H #include "internal.h" #include "avcodec.h" #include "h264.h" //#undef NDEBUG #include static inline int fetch_diagonal_mv(H264Context *h, const int16_t **C, int i, int list, int part_width){ const int topright_ref= h->ref_cache[list][ i - 8 + part_width ]; MpegEncContext *s = &h->s; /* there is no consistent mapping of mvs to neighboring locations that will * make mbaff happy, so we can't move all this logic to fill_caches */ if(FRAME_MBAFF){ #define SET_DIAG_MV(MV_OP, REF_OP, XY, Y4)\ const int xy = XY, y4 = Y4;\ const int mb_type = mb_types[xy+(y4>>2)*s->mb_stride];\ if(!USES_LIST(mb_type,list))\ return LIST_NOT_USED;\ mv = s->current_picture_ptr->motion_val[list][h->mb2b_xy[xy]+3 + y4*h->b_stride];\ h->mv_cache[list][scan8[0]-2][0] = mv[0];\ h->mv_cache[list][scan8[0]-2][1] = mv[1] MV_OP;\ return s->current_picture_ptr->ref_index[list][4*xy+1 + (y4&~1)] REF_OP; if(topright_ref == PART_NOT_AVAILABLE && i >= scan8[0]+8 && (i&7)==4 && h->ref_cache[list][scan8[0]-1] != PART_NOT_AVAILABLE){ const uint32_t *mb_types = s->current_picture_ptr->mb_type; const int16_t *mv; AV_ZERO32(h->mv_cache[list][scan8[0]-2]); *C = h->mv_cache[list][scan8[0]-2]; if(!MB_FIELD && IS_INTERLACED(h->left_type[0])){ SET_DIAG_MV(*2, >>1, h->left_mb_xy[0]+s->mb_stride, (s->mb_y&1)*2+(i>>5)); } if(MB_FIELD && !IS_INTERLACED(h->left_type[0])){ // left shift will turn LIST_NOT_USED into PART_NOT_AVAILABLE, but that's OK. SET_DIAG_MV(/2, <<1, h->left_mb_xy[i>=36], ((i>>2))&3); } } #undef SET_DIAG_MV } if(topright_ref != PART_NOT_AVAILABLE){ *C= h->mv_cache[list][ i - 8 + part_width ]; return topright_ref; }else{ tprintf(s->avctx, "topright MV not available\n"); *C= h->mv_cache[list][ i - 8 - 1 ]; return h->ref_cache[list][ i - 8 - 1 ]; } } /** * gets the predicted MV. * @param n the block index * @param part_width the width of the partition (4, 8,16) -> (1, 2, 4) * @param mx the x component of the predicted motion vector * @param my the y component of the predicted motion vector */ static inline void pred_motion(H264Context * const h, int n, int part_width, int list, int ref, int * const mx, int * const my){ const int index8= scan8[n]; const int top_ref= h->ref_cache[list][ index8 - 8 ]; const int left_ref= h->ref_cache[list][ index8 - 1 ]; const int16_t * const A= h->mv_cache[list][ index8 - 1 ]; const int16_t * const B= h->mv_cache[list][ index8 - 8 ]; const int16_t * C; int diagonal_ref, match_count; assert(part_width==1 || part_width==2 || part_width==4); /* mv_cache B . . A T T T T U . . L . . , . U . . L . . . . U . . L . . , . . . . L . . . . */ diagonal_ref= fetch_diagonal_mv(h, &C, index8, list, part_width); match_count= (diagonal_ref==ref) + (top_ref==ref) + (left_ref==ref); tprintf(h->s.avctx, "pred_motion match_count=%d\n", match_count); if(match_count > 1){ //most common *mx= mid_pred(A[0], B[0], C[0]); *my= mid_pred(A[1], B[1], C[1]); }else if(match_count==1){ if(left_ref==ref){ *mx= A[0]; *my= A[1]; }else if(top_ref==ref){ *mx= B[0]; *my= B[1]; }else{ *mx= C[0]; *my= C[1]; } }else{ if(top_ref == PART_NOT_AVAILABLE && diagonal_ref == PART_NOT_AVAILABLE && left_ref != PART_NOT_AVAILABLE){ *mx= A[0]; *my= A[1]; }else{ *mx= mid_pred(A[0], B[0], C[0]); *my= mid_pred(A[1], B[1], C[1]); } } tprintf(h->s.avctx, "pred_motion (%2d %2d %2d) (%2d %2d %2d) (%2d %2d %2d) -> (%2d %2d %2d) at %2d %2d %d list %d\n", top_ref, B[0], B[1], diagonal_ref, C[0], C[1], left_ref, A[0], A[1], ref, *mx, *my, h->s.mb_x, h->s.mb_y, n, list); } /** * gets the directionally predicted 16x8 MV. * @param n the block index * @param mx the x component of the predicted motion vector * @param my the y component of the predicted motion vector */ static inline void pred_16x8_motion(H264Context * const h, int n, int list, int ref, int * const mx, int * const my){ if(n==0){ const int top_ref= h->ref_cache[list][ scan8[0] - 8 ]; const int16_t * const B= h->mv_cache[list][ scan8[0] - 8 ]; tprintf(h->s.avctx, "pred_16x8: (%2d %2d %2d) at %2d %2d %d list %d\n", top_ref, B[0], B[1], h->s.mb_x, h->s.mb_y, n, list); if(top_ref == ref){ *mx= B[0]; *my= B[1]; return; } }else{ const int left_ref= h->ref_cache[list][ scan8[8] - 1 ]; const int16_t * const A= h->mv_cache[list][ scan8[8] - 1 ]; tprintf(h->s.avctx, "pred_16x8: (%2d %2d %2d) at %2d %2d %d list %d\n", left_ref, A[0], A[1], h->s.mb_x, h->s.mb_y, n, list); if(left_ref == ref){ *mx= A[0]; *my= A[1]; return; } } //RARE pred_motion(h, n, 4, list, ref, mx, my); } /** * gets the directionally predicted 8x16 MV. * @param n the block index * @param mx the x component of the predicted motion vector * @param my the y component of the predicted motion vector */ static inline void pred_8x16_motion(H264Context * const h, int n, int list, int ref, int * const mx, int * const my){ if(n==0){ const int left_ref= h->ref_cache[list][ scan8[0] - 1 ]; const int16_t * const A= h->mv_cache[list][ scan8[0] - 1 ]; tprintf(h->s.avctx, "pred_8x16: (%2d %2d %2d) at %2d %2d %d list %d\n", left_ref, A[0], A[1], h->s.mb_x, h->s.mb_y, n, list); if(left_ref == ref){ *mx= A[0]; *my= A[1]; return; } }else{ const int16_t * C; int diagonal_ref; diagonal_ref= fetch_diagonal_mv(h, &C, scan8[4], list, 2); tprintf(h->s.avctx, "pred_8x16: (%2d %2d %2d) at %2d %2d %d list %d\n", diagonal_ref, C[0], C[1], h->s.mb_x, h->s.mb_y, n, list); if(diagonal_ref == ref){ *mx= C[0]; *my= C[1]; return; } } //RARE pred_motion(h, n, 2, list, ref, mx, my); } static inline void pred_pskip_motion(H264Context * const h, int * const mx, int * const my){ const int top_ref = h->ref_cache[0][ scan8[0] - 8 ]; const int left_ref= h->ref_cache[0][ scan8[0] - 1 ]; tprintf(h->s.avctx, "pred_pskip: (%d) (%d) at %2d %2d\n", top_ref, left_ref, h->s.mb_x, h->s.mb_y); if(top_ref == PART_NOT_AVAILABLE || left_ref == PART_NOT_AVAILABLE || !( top_ref | AV_RN32A(h->mv_cache[0][ scan8[0] - 8 ])) || !(left_ref | AV_RN32A(h->mv_cache[0][ scan8[0] - 1 ]))){ *mx = *my = 0; return; } pred_motion(h, 0, 4, 0, 0, mx, my); return; } #endif /* AVCODEC_H264_MVPRED_H */