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FFmpeg/libavcodec/h264_mvpred.h

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/*
* H.26L/H.264/AVC/JVT/14496-10/... motion vector predicion
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
*
* 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 libavcodec/h264_mvpred.h
* H.264 / AVC / MPEG4 part10 motion vector predicion.
* @author Michael Niedermayer <michaelni@gmx.at>
*/
#ifndef AVCODEC_H264_MVPRED_H
#define AVCODEC_H264_MVPRED_H
#include "internal.h"
#include "avcodec.h"
#include "h264.h"
//#undef NDEBUG
#include <assert.h>
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){
const uint32_t *mb_types = s->current_picture_ptr->mb_type;
const int16_t *mv;
*(uint32_t*)h->mv_cache[list][scan8[0]-2] = 0;
*C = h->mv_cache[list][scan8[0]-2];
if(!MB_FIELD
&& (s->mb_y&1) && i < scan8[0]+8 && topright_ref != PART_NOT_AVAILABLE){
int topright_xy = s->mb_x + (s->mb_y-1)*s->mb_stride + (i == scan8[0]+3);
if(IS_INTERLACED(mb_types[topright_xy])){
#define SET_DIAG_MV(MV_OP, REF_OP, X4, Y4)\
const int x4 = X4, y4 = Y4;\
const int mb_type = mb_types[(x4>>2)+(y4>>2)*s->mb_stride];\
if(!USES_LIST(mb_type,list))\
return LIST_NOT_USED;\
mv = s->current_picture_ptr->motion_val[list][x4 + 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][(x4>>1) + (y4>>1)*h->b8_stride] REF_OP;
SET_DIAG_MV(*2, >>1, s->mb_x*4+(i&7)-4+part_width, s->mb_y*4-1);
}
}
if(topright_ref == PART_NOT_AVAILABLE
&& ((s->mb_y&1) || i >= scan8[0]+8) && (i&7)==4
&& h->ref_cache[list][scan8[0]-1] != PART_NOT_AVAILABLE){
if(!MB_FIELD
&& IS_INTERLACED(mb_types[h->left_mb_xy[0]])){
SET_DIAG_MV(*2, >>1, s->mb_x*4-1, (s->mb_y|1)*4+(s->mb_y&1)*2+(i>>4)-1);
}
if(MB_FIELD
&& !IS_INTERLACED(mb_types[h->left_mb_xy[0]])
&& i >= scan8[0]+8){
// left shift will turn LIST_NOT_USED into PART_NOT_AVAILABLE, but that's OK.
SET_DIAG_MV(/2, <<1, s->mb_x*4-1, (s->mb_y&~1)*4 - 1 + ((i-scan8[0])>>3)*2);
}
}
#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 | *(uint32_t*)h->mv_cache[0][ scan8[0] - 8 ])
|| !(left_ref | *(uint32_t*)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 */