release/src/router/ffmpeg/libavcodec/h263.c

   1 /*
   2  * H263/MPEG4 backend for ffmpeg encoder and decoder
   3  * Copyright (c) 2000,2001 Fabrice Bellard
   4  * H263+ 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  * h263/mpeg4 codec.
  28  */
  29
  30 //#define DEBUG
  31 #include <limits.h>
  32
  33 #include "dsputil.h"
  34 #include "avcodec.h"
  35 #include "mpegvideo.h"
  36 #include "h263.h"
  37 #include "h263data.h"
  38 #include "mathops.h"
  39 #include "unary.h"
  40 #include "flv.h"
  41 #include "mpeg4video.h"
  42
  43 //#undef NDEBUG
  44 //#include <assert.h>
  45
  46 uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
  47
  48
  49 void ff_h263_update_motion_val(MpegEncContext * s){
  50     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
  51                //FIXME a lot of that is only needed for !low_delay
  52     const int wrap = s->b8_stride;
  53     const int xy = s->block_index[0];
  54
  55     s->current_picture.mbskip_table[mb_xy]= s->mb_skipped;
  56
  57     if(s->mv_type != MV_TYPE_8X8){
  58         int motion_x, motion_y;
  59         if (s->mb_intra) {
  60             motion_x = 0;
  61             motion_y = 0;
  62         } else if (s->mv_type == MV_TYPE_16X16) {
  63             motion_x = s->mv[0][0][0];
  64             motion_y = s->mv[0][0][1];
  65         } else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
  66             int i;
  67             motion_x = s->mv[0][0][0] + s->mv[0][1][0];
  68             motion_y = s->mv[0][0][1] + s->mv[0][1][1];
  69             motion_x = (motion_x>>1) | (motion_x&1);
  70             for(i=0; i<2; i++){
  71                 s->p_field_mv_table[i][0][mb_xy][0]= s->mv[0][i][0];
  72                 s->p_field_mv_table[i][0][mb_xy][1]= s->mv[0][i][1];
  73             }
  74             s->current_picture.ref_index[0][4*mb_xy    ]=
  75             s->current_picture.ref_index[0][4*mb_xy + 1]= s->field_select[0][0];
  76             s->current_picture.ref_index[0][4*mb_xy + 2]=
  77             s->current_picture.ref_index[0][4*mb_xy + 3]= s->field_select[0][1];
  78         }
  79
  80         /* no update if 8X8 because it has been done during parsing */
  81         s->current_picture.motion_val[0][xy][0] = motion_x;
  82         s->current_picture.motion_val[0][xy][1] = motion_y;
  83         s->current_picture.motion_val[0][xy + 1][0] = motion_x;
  84         s->current_picture.motion_val[0][xy + 1][1] = motion_y;
  85         s->current_picture.motion_val[0][xy + wrap][0] = motion_x;
  86         s->current_picture.motion_val[0][xy + wrap][1] = motion_y;
  87         s->current_picture.motion_val[0][xy + 1 + wrap][0] = motion_x;
  88         s->current_picture.motion_val[0][xy + 1 + wrap][1] = motion_y;
  89     }
  90
  91     if(s->encoding){ //FIXME encoding MUST be cleaned up
  92         if (s->mv_type == MV_TYPE_8X8)
  93             s->current_picture.mb_type[mb_xy]= MB_TYPE_L0 | MB_TYPE_8x8;
  94         else if(s->mb_intra)
  95             s->current_picture.mb_type[mb_xy]= MB_TYPE_INTRA;
  96         else
  97             s->current_picture.mb_type[mb_xy]= MB_TYPE_L0 | MB_TYPE_16x16;
  98     }
  99 }
 100
 101 int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
 102 {
 103     int x, y, wrap, a, c, pred_dc;
 104     int16_t *dc_val;
 105
 106     /* find prediction */
 107     if (n < 4) {
 108         x = 2 * s->mb_x + (n & 1);
 109         y = 2 * s->mb_y + ((n & 2) >> 1);
 110         wrap = s->b8_stride;
 111         dc_val = s->dc_val[0];
 112     } else {
 113         x = s->mb_x;
 114         y = s->mb_y;
 115         wrap = s->mb_stride;
 116         dc_val = s->dc_val[n - 4 + 1];
 117     }
 118     /* B C
 119      * A X
 120      */
 121     a = dc_val[(x - 1) + (y) * wrap];
 122     c = dc_val[(x) + (y - 1) * wrap];
 123
 124     /* No prediction outside GOB boundary */
 125     if(s->first_slice_line && n!=3){
 126         if(n!=2) c= 1024;
 127         if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024;
 128     }
 129     /* just DC prediction */
 130     if (a != 1024 && c != 1024)
 131         pred_dc = (a + c) >> 1;
 132     else if (a != 1024)
 133         pred_dc = a;
 134     else
 135         pred_dc = c;
 136
 137     /* we assume pred is positive */
 138     *dc_val_ptr = &dc_val[x + y * wrap];
 139     return pred_dc;
 140 }
 141
 142 void ff_h263_loop_filter(MpegEncContext * s){
 143     int qp_c;
 144     const int linesize  = s->linesize;
 145     const int uvlinesize= s->uvlinesize;
 146     const int xy = s->mb_y * s->mb_stride + s->mb_x;
 147     uint8_t *dest_y = s->dest[0];
 148     uint8_t *dest_cb= s->dest[1];
 149     uint8_t *dest_cr= s->dest[2];
 150
 151 //    if(s->pict_type==FF_B_TYPE && !s->readable) return;
 152
 153     /*
 154        Diag Top
 155        Left Center
 156     */
 157     if(!IS_SKIP(s->current_picture.mb_type[xy])){
 158         qp_c= s->qscale;
 159         s->dsp.h263_v_loop_filter(dest_y+8*linesize  , linesize, qp_c);
 160         s->dsp.h263_v_loop_filter(dest_y+8*linesize+8, linesize, qp_c);
 161     }else
 162         qp_c= 0;
 163
 164     if(s->mb_y){
 165         int qp_dt, qp_tt, qp_tc;
 166
 167         if(IS_SKIP(s->current_picture.mb_type[xy-s->mb_stride]))
 168             qp_tt=0;
 169         else
 170             qp_tt= s->current_picture.qscale_table[xy-s->mb_stride];
 171
 172         if(qp_c)
 173             qp_tc= qp_c;
 174         else
 175             qp_tc= qp_tt;
 176
 177         if(qp_tc){
 178             const int chroma_qp= s->chroma_qscale_table[qp_tc];
 179             s->dsp.h263_v_loop_filter(dest_y  ,   linesize, qp_tc);
 180             s->dsp.h263_v_loop_filter(dest_y+8,   linesize, qp_tc);
 181
 182             s->dsp.h263_v_loop_filter(dest_cb , uvlinesize, chroma_qp);
 183             s->dsp.h263_v_loop_filter(dest_cr , uvlinesize, chroma_qp);
 184         }
 185
 186         if(qp_tt)
 187             s->dsp.h263_h_loop_filter(dest_y-8*linesize+8  ,   linesize, qp_tt);
 188
 189         if(s->mb_x){
 190             if(qp_tt || IS_SKIP(s->current_picture.mb_type[xy-1-s->mb_stride]))
 191                 qp_dt= qp_tt;
 192             else
 193                 qp_dt= s->current_picture.qscale_table[xy-1-s->mb_stride];
 194
 195             if(qp_dt){
 196                 const int chroma_qp= s->chroma_qscale_table[qp_dt];
 197                 s->dsp.h263_h_loop_filter(dest_y -8*linesize  ,   linesize, qp_dt);
 198                 s->dsp.h263_h_loop_filter(dest_cb-8*uvlinesize, uvlinesize, chroma_qp);
 199                 s->dsp.h263_h_loop_filter(dest_cr-8*uvlinesize, uvlinesize, chroma_qp);
 200             }
 201         }
 202     }
 203
 204     if(qp_c){
 205         s->dsp.h263_h_loop_filter(dest_y +8,   linesize, qp_c);
 206         if(s->mb_y + 1 == s->mb_height)
 207             s->dsp.h263_h_loop_filter(dest_y+8*linesize+8,   linesize, qp_c);
 208     }
 209
 210     if(s->mb_x){
 211         int qp_lc;
 212         if(qp_c || IS_SKIP(s->current_picture.mb_type[xy-1]))
 213             qp_lc= qp_c;
 214         else
 215             qp_lc= s->current_picture.qscale_table[xy-1];
 216
 217         if(qp_lc){
 218             s->dsp.h263_h_loop_filter(dest_y,   linesize, qp_lc);
 219             if(s->mb_y + 1 == s->mb_height){
 220                 const int chroma_qp= s->chroma_qscale_table[qp_lc];
 221                 s->dsp.h263_h_loop_filter(dest_y +8*  linesize,   linesize, qp_lc);
 222                 s->dsp.h263_h_loop_filter(dest_cb             , uvlinesize, chroma_qp);
 223                 s->dsp.h263_h_loop_filter(dest_cr             , uvlinesize, chroma_qp);
 224             }
 225         }
 226     }
 227 }
 228
 229 void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n)
 230 {
 231     int x, y, wrap, a, c, pred_dc, scale, i;
 232     int16_t *dc_val, *ac_val, *ac_val1;
 233
 234     /* find prediction */
 235     if (n < 4) {
 236         x = 2 * s->mb_x + (n & 1);
 237         y = 2 * s->mb_y + (n>> 1);
 238         wrap = s->b8_stride;
 239         dc_val = s->dc_val[0];
 240         ac_val = s->ac_val[0][0];
 241         scale = s->y_dc_scale;
 242     } else {
 243         x = s->mb_x;
 244         y = s->mb_y;
 245         wrap = s->mb_stride;
 246         dc_val = s->dc_val[n - 4 + 1];
 247         ac_val = s->ac_val[n - 4 + 1][0];
 248         scale = s->c_dc_scale;
 249     }
 250
 251     ac_val += ((y) * wrap + (x)) * 16;
 252     ac_val1 = ac_val;
 253
 254     /* B C
 255      * A X
 256      */
 257     a = dc_val[(x - 1) + (y) * wrap];
 258     c = dc_val[(x) + (y - 1) * wrap];
 259
 260     /* No prediction outside GOB boundary */
 261     if(s->first_slice_line && n!=3){
 262         if(n!=2) c= 1024;
 263         if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024;
 264     }
 265
 266     if (s->ac_pred) {
 267         pred_dc = 1024;
 268         if (s->h263_aic_dir) {
 269             /* left prediction */
 270             if (a != 1024) {
 271                 ac_val -= 16;
 272                 for(i=1;i<8;i++) {
 273                     block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
 274                 }
 275                 pred_dc = a;
 276             }
 277         } else {
 278             /* top prediction */
 279             if (c != 1024) {
 280                 ac_val -= 16 * wrap;
 281                 for(i=1;i<8;i++) {
 282                     block[s->dsp.idct_permutation[i   ]] += ac_val[i + 8];
 283                 }
 284                 pred_dc = c;
 285             }
 286         }
 287     } else {
 288         /* just DC prediction */
 289         if (a != 1024 && c != 1024)
 290             pred_dc = (a + c) >> 1;
 291         else if (a != 1024)
 292             pred_dc = a;
 293         else
 294             pred_dc = c;
 295     }
 296
 297     /* we assume pred is positive */
 298     block[0]=block[0]*scale + pred_dc;
 299
 300     if (block[0] < 0)
 301         block[0] = 0;
 302     else
 303         block[0] |= 1;
 304
 305     /* Update AC/DC tables */
 306     dc_val[(x) + (y) * wrap] = block[0];
 307
 308     /* left copy */
 309     for(i=1;i<8;i++)
 310         ac_val1[i    ] = block[s->dsp.idct_permutation[i<<3]];
 311     /* top copy */
 312     for(i=1;i<8;i++)
 313         ac_val1[8 + i] = block[s->dsp.idct_permutation[i   ]];
 314 }
 315
 316 int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir,
 317                         int *px, int *py)
 318 {
 319     int wrap;
 320     int16_t *A, *B, *C, (*mot_val)[2];
 321     static const int off[4]= {2, 1, 1, -1};
 322
 323     wrap = s->b8_stride;
 324     mot_val = s->current_picture.motion_val[dir] + s->block_index[block];
 325
 326     A = mot_val[ - 1];
 327     /* special case for first (slice) line */
 328     if (s->first_slice_line && block<3) {
 329         // we can't just change some MVs to simulate that as we need them for the B frames (and ME)
 330         // and if we ever support non rectangular objects than we need to do a few ifs here anyway :(
 331         if(block==0){ //most common case
 332             if(s->mb_x  == s->resync_mb_x){ //rare
 333                 *px= *py = 0;
 334             }else if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
 335                 C = mot_val[off[block] - wrap];
 336                 if(s->mb_x==0){
 337                     *px = C[0];
 338                     *py = C[1];
 339                 }else{
 340                     *px = mid_pred(A[0], 0, C[0]);
 341                     *py = mid_pred(A[1], 0, C[1]);
 342                 }
 343             }else{
 344                 *px = A[0];
 345                 *py = A[1];
 346             }
 347         }else if(block==1){
 348             if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
 349                 C = mot_val[off[block] - wrap];
 350                 *px = mid_pred(A[0], 0, C[0]);
 351                 *py = mid_pred(A[1], 0, C[1]);
 352             }else{
 353                 *px = A[0];
 354                 *py = A[1];
 355             }
 356         }else{ /* block==2*/
 357             B = mot_val[ - wrap];
 358             C = mot_val[off[block] - wrap];
 359             if(s->mb_x == s->resync_mb_x) //rare
 360                 A[0]=A[1]=0;
 361
 362             *px = mid_pred(A[0], B[0], C[0]);
 363             *py = mid_pred(A[1], B[1], C[1]);
 364         }
 365     } else {
 366         B = mot_val[ - wrap];
 367         C = mot_val[off[block] - wrap];
 368         *px = mid_pred(A[0], B[0], C[0]);
 369         *py = mid_pred(A[1], B[1], C[1]);
 370     }
 371     return *mot_val;
 372 }
 373
 374
 375 /**
 376  * Get the GOB height based on picture height.
 377  */
 378 int ff_h263_get_gob_height(MpegEncContext *s){
 379     if (s->height <= 400)
 380         return 1;
 381     else if (s->height <= 800)
 382         return  2;
 383     else
 384         return 4;
 385 }