libavcodec/h263.c

   1 /*
   2  * H.263/MPEG-4 backend for encoder and decoder
   3  * Copyright (c) 2000,2001 Fabrice Bellard
   4  * H.263+ support.
   5  * Copyright (c) 2001 Juan J. Sierralta P
   6  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
   7  *
   8  * This file is part of FFmpeg.
   9  *
  10  * FFmpeg is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * FFmpeg is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with FFmpeg; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  23  */
  24
  25 /**
  26  * @file
  27  * H.263/MPEG-4 codec.
  28  */
  29
  30 #include "libavutil/thread.h"
  31 #include "mpegvideo.h"
  32 #include "h263.h"
  33 #include "h263data.h"
  34 #include "h263dsp.h"
  35 #include "idctdsp.h"
  36 #include "mathops.h"
  37 #include "mpegpicture.h"
  38 #include "mpegutils.h"
  39 #include "rl.h"
  40
  41 static av_cold void h263_init_rl_inter(void)
  42 {
  43     static uint8_t h263_rl_inter_table[2][2 * MAX_RUN + MAX_LEVEL + 3];
  44     ff_rl_init(&ff_h263_rl_inter, h263_rl_inter_table);
  45 }
  46
  47 av_cold void ff_h263_init_rl_inter(void)
  48 {
  49     static AVOnce init_static_once = AV_ONCE_INIT;
  50     ff_thread_once(&init_static_once, h263_init_rl_inter);
  51 }
  52
  53 void ff_h263_update_motion_val(MpegEncContext * s){
  54     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
  55                //FIXME a lot of that is only needed for !low_delay
  56     const int wrap = s->b8_stride;
  57     const int xy = s->block_index[0];
  58
  59     if(s->mv_type != MV_TYPE_8X8){
  60         int motion_x, motion_y;
  61         if (s->mb_intra) {
  62             motion_x = 0;
  63             motion_y = 0;
  64         } else if (s->mv_type == MV_TYPE_16X16) {
  65             motion_x = s->mv[0][0][0];
  66             motion_y = s->mv[0][0][1];
  67         } else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
  68             int i;
  69             motion_x = s->mv[0][0][0] + s->mv[0][1][0];
  70             motion_y = s->mv[0][0][1] + s->mv[0][1][1];
  71             motion_x = (motion_x>>1) | (motion_x&1);
  72             for(i=0; i<2; i++){
  73                 s->p_field_mv_table[i][0][mb_xy][0]= s->mv[0][i][0];
  74                 s->p_field_mv_table[i][0][mb_xy][1]= s->mv[0][i][1];
  75             }
  76             s->cur_pic.ref_index[0][4*mb_xy    ] =
  77             s->cur_pic.ref_index[0][4*mb_xy + 1] = s->field_select[0][0];
  78             s->cur_pic.ref_index[0][4*mb_xy + 2] =
  79             s->cur_pic.ref_index[0][4*mb_xy + 3] = s->field_select[0][1];
  80         }
  81
  82         /* no update if 8X8 because it has been done during parsing */
  83         s->cur_pic.motion_val[0][xy][0]            = motion_x;
  84         s->cur_pic.motion_val[0][xy][1]            = motion_y;
  85         s->cur_pic.motion_val[0][xy + 1][0]        = motion_x;
  86         s->cur_pic.motion_val[0][xy + 1][1]        = motion_y;
  87         s->cur_pic.motion_val[0][xy + wrap][0]     = motion_x;
  88         s->cur_pic.motion_val[0][xy + wrap][1]     = motion_y;
  89         s->cur_pic.motion_val[0][xy + 1 + wrap][0] = motion_x;
  90         s->cur_pic.motion_val[0][xy + 1 + wrap][1] = motion_y;
  91     }
  92 }
  93
  94 void ff_h263_loop_filter(MpegEncContext * s){
  95     int qp_c;
  96     const int linesize  = s->linesize;
  97     const int uvlinesize= s->uvlinesize;
  98     const int xy = s->mb_y * s->mb_stride + s->mb_x;
  99     uint8_t *dest_y = s->dest[0];
 100     uint8_t *dest_cb= s->dest[1];
 101     uint8_t *dest_cr= s->dest[2];
 102
 103     /*
 104        Diag Top
 105        Left Center
 106     */
 107     if (!IS_SKIP(s->cur_pic.mb_type[xy])) {
 108         qp_c= s->qscale;
 109         s->h263dsp.h263_v_loop_filter(dest_y + 8 * linesize,     linesize, qp_c);
 110         s->h263dsp.h263_v_loop_filter(dest_y + 8 * linesize + 8, linesize, qp_c);
 111     }else
 112         qp_c= 0;
 113
 114     if(s->mb_y){
 115         int qp_dt, qp_tt, qp_tc;
 116
 117         if (IS_SKIP(s->cur_pic.mb_type[xy - s->mb_stride]))
 118             qp_tt=0;
 119         else
 120             qp_tt = s->cur_pic.qscale_table[xy - s->mb_stride];
 121
 122         if(qp_c)
 123             qp_tc= qp_c;
 124         else
 125             qp_tc= qp_tt;
 126
 127         if(qp_tc){
 128             const int chroma_qp= s->chroma_qscale_table[qp_tc];
 129             s->h263dsp.h263_v_loop_filter(dest_y,     linesize, qp_tc);
 130             s->h263dsp.h263_v_loop_filter(dest_y + 8, linesize, qp_tc);
 131
 132             s->h263dsp.h263_v_loop_filter(dest_cb, uvlinesize, chroma_qp);
 133             s->h263dsp.h263_v_loop_filter(dest_cr, uvlinesize, chroma_qp);
 134         }
 135
 136         if(qp_tt)
 137             s->h263dsp.h263_h_loop_filter(dest_y - 8 * linesize + 8, linesize, qp_tt);
 138
 139         if(s->mb_x){
 140             if (qp_tt || IS_SKIP(s->cur_pic.mb_type[xy - 1 - s->mb_stride]))
 141                 qp_dt= qp_tt;
 142             else
 143                 qp_dt = s->cur_pic.qscale_table[xy - 1 - s->mb_stride];
 144
 145             if(qp_dt){
 146                 const int chroma_qp= s->chroma_qscale_table[qp_dt];
 147                 s->h263dsp.h263_h_loop_filter(dest_y  - 8 * linesize,   linesize,   qp_dt);
 148                 s->h263dsp.h263_h_loop_filter(dest_cb - 8 * uvlinesize, uvlinesize, chroma_qp);
 149                 s->h263dsp.h263_h_loop_filter(dest_cr - 8 * uvlinesize, uvlinesize, chroma_qp);
 150             }
 151         }
 152     }
 153
 154     if(qp_c){
 155         s->h263dsp.h263_h_loop_filter(dest_y + 8, linesize, qp_c);
 156         if(s->mb_y + 1 == s->mb_height)
 157             s->h263dsp.h263_h_loop_filter(dest_y + 8 * linesize + 8, linesize, qp_c);
 158     }
 159
 160     if(s->mb_x){
 161         int qp_lc;
 162         if (qp_c || IS_SKIP(s->cur_pic.mb_type[xy - 1]))
 163             qp_lc= qp_c;
 164         else
 165             qp_lc = s->cur_pic.qscale_table[xy - 1];
 166
 167         if(qp_lc){
 168             s->h263dsp.h263_h_loop_filter(dest_y, linesize, qp_lc);
 169             if(s->mb_y + 1 == s->mb_height){
 170                 const int chroma_qp= s->chroma_qscale_table[qp_lc];
 171                 s->h263dsp.h263_h_loop_filter(dest_y + 8 * linesize, linesize, qp_lc);
 172                 s->h263dsp.h263_h_loop_filter(dest_cb, uvlinesize, chroma_qp);
 173                 s->h263dsp.h263_h_loop_filter(dest_cr, uvlinesize, chroma_qp);
 174             }
 175         }
 176     }
 177 }
 178
 179 int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
 180                              int *px, int *py)
 181 {
 182     int wrap;
 183     int16_t *A, *B, *C, (*mot_val)[2];
 184     static const int off[4]= {2, 1, 1, -1};
 185
 186     wrap = s->b8_stride;
 187     mot_val = s->cur_pic.motion_val[dir] + s->block_index[block];
 188
 189     A = mot_val[ - 1];
 190     /* special case for first (slice) line */
 191     if (s->first_slice_line && block<3) {
 192         // we can't just change some MVs to simulate that as we need them for the B-frames (and ME)
 193         // and if we ever support non rectangular objects than we need to do a few ifs here anyway :(
 194         if(block==0){ //most common case
 195             if(s->mb_x  == s->resync_mb_x){ //rare
 196                 *px= *py = 0;
 197             }else if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
 198                 C = mot_val[off[block] - wrap];
 199                 if(s->mb_x==0){
 200                     *px = C[0];
 201                     *py = C[1];
 202                 }else{
 203                     *px = mid_pred(A[0], 0, C[0]);
 204                     *py = mid_pred(A[1], 0, C[1]);
 205                 }
 206             }else{
 207                 *px = A[0];
 208                 *py = A[1];
 209             }
 210         }else if(block==1){
 211             if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
 212                 C = mot_val[off[block] - wrap];
 213                 *px = mid_pred(A[0], 0, C[0]);
 214                 *py = mid_pred(A[1], 0, C[1]);
 215             }else{
 216                 *px = A[0];
 217                 *py = A[1];
 218             }
 219         }else{ /* block==2*/
 220             B = mot_val[ - wrap];
 221             C = mot_val[off[block] - wrap];
 222             if(s->mb_x == s->resync_mb_x) //rare
 223                 A[0]=A[1]=0;
 224
 225             *px = mid_pred(A[0], B[0], C[0]);
 226             *py = mid_pred(A[1], B[1], C[1]);
 227         }
 228     } else {
 229         B = mot_val[ - wrap];
 230         C = mot_val[off[block] - wrap];
 231         *px = mid_pred(A[0], B[0], C[0]);
 232         *py = mid_pred(A[1], B[1], C[1]);
 233     }
 234     return *mot_val;
 235 }