libavcodec/wmv2dec.c

   1 /*
   2  * Copyright (c) 2002 The FFmpeg Project.
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "avcodec.h"
  22 #include "dsputil.h"
  23 #include "mpegvideo.h"
  24 #include "msmpeg4.h"
  25 #include "msmpeg4data.h"
  26 #include "intrax8.h"
  27 #include "wmv2.h"
  28
  29
  30 static void parse_mb_skip(Wmv2Context * w){
  31     int mb_x, mb_y;
  32     MpegEncContext * const s= &w->s;
  33     uint32_t * const mb_type= s->current_picture_ptr->mb_type;
  34
  35     w->skip_type= get_bits(&s->gb, 2);
  36     switch(w->skip_type){
  37     case SKIP_TYPE_NONE:
  38         for(mb_y=0; mb_y<s->mb_height; mb_y++){
  39             for(mb_x=0; mb_x<s->mb_width; mb_x++){
  40                 mb_type[mb_y*s->mb_stride + mb_x]= MB_TYPE_16x16 | MB_TYPE_L0;
  41             }
  42         }
  43         break;
  44     case SKIP_TYPE_MPEG:
  45         for(mb_y=0; mb_y<s->mb_height; mb_y++){
  46             for(mb_x=0; mb_x<s->mb_width; mb_x++){
  47                 mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
  48             }
  49         }
  50         break;
  51     case SKIP_TYPE_ROW:
  52         for(mb_y=0; mb_y<s->mb_height; mb_y++){
  53             if(get_bits1(&s->gb)){
  54                 for(mb_x=0; mb_x<s->mb_width; mb_x++){
  55                     mb_type[mb_y*s->mb_stride + mb_x]=  MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
  56                 }
  57             }else{
  58                 for(mb_x=0; mb_x<s->mb_width; mb_x++){
  59                     mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
  60                 }
  61             }
  62         }
  63         break;
  64     case SKIP_TYPE_COL:
  65         for(mb_x=0; mb_x<s->mb_width; mb_x++){
  66             if(get_bits1(&s->gb)){
  67                 for(mb_y=0; mb_y<s->mb_height; mb_y++){
  68                     mb_type[mb_y*s->mb_stride + mb_x]=  MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
  69                 }
  70             }else{
  71                 for(mb_y=0; mb_y<s->mb_height; mb_y++){
  72                     mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
  73                 }
  74             }
  75         }
  76         break;
  77     }
  78 }
  79
  80 static int decode_ext_header(Wmv2Context *w){
  81     MpegEncContext * const s= &w->s;
  82     GetBitContext gb;
  83     int fps;
  84     int code;
  85
  86     if(s->avctx->extradata_size<4) return -1;
  87
  88     init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
  89
  90     fps                = get_bits(&gb, 5);
  91     s->bit_rate        = get_bits(&gb, 11)*1024;
  92     w->mspel_bit       = get_bits1(&gb);
  93     s->loop_filter     = get_bits1(&gb);
  94     w->abt_flag        = get_bits1(&gb);
  95     w->j_type_bit      = get_bits1(&gb);
  96     w->top_left_mv_flag= get_bits1(&gb);
  97     w->per_mb_rl_bit   = get_bits1(&gb);
  98     code               = get_bits(&gb, 3);
  99
 100     if(code==0) return -1;
 101
 102     s->slice_height = s->mb_height / code;
 103
 104     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 105         av_log(s->avctx, AV_LOG_DEBUG, "fps:%d, br:%d, qpbit:%d, abt_flag:%d, j_type_bit:%d, tl_mv_flag:%d, mbrl_bit:%d, code:%d, loop_filter:%d, slices:%d\n",
 106         fps, s->bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit, w->top_left_mv_flag, w->per_mb_rl_bit, code, s->loop_filter,
 107         code);
 108     }
 109     return 0;
 110 }
 111
 112 int ff_wmv2_decode_picture_header(MpegEncContext * s)
 113 {
 114     Wmv2Context * const w= (Wmv2Context*)s;
 115     int code;
 116
 117 #if 0
 118 {
 119 int i;
 120 for(i=0; i<s->gb.size*8; i++)
 121     printf("%d", get_bits1(&s->gb));
 122 //    get_bits1(&s->gb);
 123 printf("END\n");
 124 return -1;
 125 }
 126 #endif
 127     if(s->picture_number==0)
 128         decode_ext_header(w);
 129
 130     s->pict_type = get_bits1(&s->gb) + 1;
 131     if(s->pict_type == FF_I_TYPE){
 132         code = get_bits(&s->gb, 7);
 133         av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code);
 134     }
 135     s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
 136     if(s->qscale <= 0)
 137        return -1;
 138
 139     return 0;
 140 }
 141
 142 int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s)
 143 {
 144     Wmv2Context * const w= (Wmv2Context*)s;
 145
 146     if (s->pict_type == FF_I_TYPE) {
 147         if(w->j_type_bit) w->j_type= get_bits1(&s->gb);
 148         else              w->j_type= 0; //FIXME check
 149
 150         if(!w->j_type){
 151             if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb);
 152             else                 s->per_mb_rl_table= 0;
 153
 154             if(!s->per_mb_rl_table){
 155                 s->rl_chroma_table_index = decode012(&s->gb);
 156                 s->rl_table_index = decode012(&s->gb);
 157             }
 158
 159             s->dc_table_index = get_bits1(&s->gb);
 160         }
 161         s->inter_intra_pred= 0;
 162         s->no_rounding = 1;
 163         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 164             av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n",
 165                 s->qscale,
 166                 s->rl_chroma_table_index,
 167                 s->rl_table_index,
 168                 s->dc_table_index,
 169                 s->per_mb_rl_table,
 170                 w->j_type);
 171         }
 172     }else{
 173         int cbp_index;
 174         w->j_type=0;
 175
 176         parse_mb_skip(w);
 177         cbp_index= decode012(&s->gb);
 178         if(s->qscale <= 10){
 179             int map[3]= {0,2,1};
 180             w->cbp_table_index= map[cbp_index];
 181         }else if(s->qscale <= 20){
 182             int map[3]= {1,0,2};
 183             w->cbp_table_index= map[cbp_index];
 184         }else{
 185             int map[3]= {2,1,0};
 186             w->cbp_table_index= map[cbp_index];
 187         }
 188
 189         if(w->mspel_bit) s->mspel= get_bits1(&s->gb);
 190         else             s->mspel= 0; //FIXME check
 191
 192         if(w->abt_flag){
 193             w->per_mb_abt= get_bits1(&s->gb)^1;
 194             if(!w->per_mb_abt){
 195                 w->abt_type= decode012(&s->gb);
 196             }
 197         }
 198
 199         if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb);
 200         else                 s->per_mb_rl_table= 0;
 201
 202         if(!s->per_mb_rl_table){
 203             s->rl_table_index = decode012(&s->gb);
 204             s->rl_chroma_table_index = s->rl_table_index;
 205         }
 206
 207         s->dc_table_index = get_bits1(&s->gb);
 208         s->mv_table_index = get_bits1(&s->gb);
 209
 210         s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
 211         s->no_rounding ^= 1;
 212
 213         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 214             av_log(s->avctx, AV_LOG_DEBUG, "rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d mspel:%d per_mb_abt:%d abt_type:%d cbp:%d ii:%d\n",
 215                 s->rl_table_index,
 216                 s->rl_chroma_table_index,
 217                 s->dc_table_index,
 218                 s->mv_table_index,
 219                 s->per_mb_rl_table,
 220                 s->qscale,
 221                 s->mspel,
 222                 w->per_mb_abt,
 223                 w->abt_type,
 224                 w->cbp_table_index,
 225                 s->inter_intra_pred);
 226         }
 227     }
 228     s->esc3_level_length= 0;
 229     s->esc3_run_length= 0;
 230
 231 s->picture_number++; //FIXME ?
 232
 233
 234     if(w->j_type){
 235         ff_intrax8_decode_picture(&w->x8, 2*s->qscale, (s->qscale-1)|1 );
 236         return 1;
 237     }
 238
 239     return 0;
 240 }
 241
 242 static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr){
 243     MpegEncContext * const s= &w->s;
 244     int ret;
 245
 246     ret= ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);
 247
 248     if(ret<0) return -1;
 249
 250     if((((*mx_ptr)|(*my_ptr)) & 1) && s->mspel)
 251         w->hshift= get_bits1(&s->gb);
 252     else
 253         w->hshift= 0;
 254
 255 //printf("%d %d  ", *mx_ptr, *my_ptr);
 256
 257     return 0;
 258 }
 259
 260 static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py){
 261     MpegEncContext * const s= &w->s;
 262     int xy, wrap, diff, type;
 263     int16_t *A, *B, *C, *mot_val;
 264
 265     wrap = s->b8_stride;
 266     xy = s->block_index[0];
 267
 268     mot_val = s->current_picture.motion_val[0][xy];
 269
 270     A = s->current_picture.motion_val[0][xy - 1];
 271     B = s->current_picture.motion_val[0][xy - wrap];
 272     C = s->current_picture.motion_val[0][xy + 2 - wrap];
 273
 274     if(s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag)
 275         diff= FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1]));
 276     else
 277         diff=0;
 278
 279     if(diff >= 8)
 280         type= get_bits1(&s->gb);
 281     else
 282         type= 2;
 283
 284     if(type == 0){
 285         *px= A[0];
 286         *py= A[1];
 287     }else if(type == 1){
 288         *px= B[0];
 289         *py= B[1];
 290     }else{
 291         /* special case for first (slice) line */
 292         if (s->first_slice_line) {
 293             *px = A[0];
 294             *py = A[1];
 295         } else {
 296             *px = mid_pred(A[0], B[0], C[0]);
 297             *py = mid_pred(A[1], B[1], C[1]);
 298         }
 299     }
 300
 301     return mot_val;
 302 }
 303
 304 static inline int wmv2_decode_inter_block(Wmv2Context *w, DCTELEM *block, int n, int cbp){
 305     MpegEncContext * const s= &w->s;
 306     static const int sub_cbp_table[3]= {2,3,1};
 307     int sub_cbp;
 308
 309     if(!cbp){
 310         s->block_last_index[n] = -1;
 311
 312         return 0;
 313     }
 314
 315     if(w->per_block_abt)
 316         w->abt_type= decode012(&s->gb);
 317 #if 0
 318     if(w->per_block_abt)
 319         printf("B%d", w->abt_type);
 320 #endif
 321     w->abt_type_table[n]= w->abt_type;
 322
 323     if(w->abt_type){
 324 //        const uint8_t *scantable= w->abt_scantable[w->abt_type-1].permutated;
 325         const uint8_t *scantable= w->abt_scantable[w->abt_type-1].scantable;
 326 //        const uint8_t *scantable= w->abt_type-1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable;
 327
 328         sub_cbp= sub_cbp_table[ decode012(&s->gb) ];
 329 //        printf("S%d", sub_cbp);
 330
 331         if(sub_cbp&1){
 332             if (ff_msmpeg4_decode_block(s, block, n, 1, scantable) < 0)
 333                 return -1;
 334         }
 335
 336         if(sub_cbp&2){
 337             if (ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable) < 0)
 338                 return -1;
 339         }
 340         s->block_last_index[n] = 63;
 341
 342         return 0;
 343     }else{
 344         return ff_msmpeg4_decode_block(s, block, n, 1, s->inter_scantable.permutated);
 345     }
 346 }
 347
 348
 349 int ff_wmv2_decode_mb(MpegEncContext *s, DCTELEM block[6][64])
 350 {
 351     Wmv2Context * const w= (Wmv2Context*)s;
 352     int cbp, code, i;
 353     uint8_t *coded_val;
 354
 355     if(w->j_type) return 0;
 356
 357     if (s->pict_type == FF_P_TYPE) {
 358         if(IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])){
 359             /* skip mb */
 360             s->mb_intra = 0;
 361             for(i=0;i<6;i++)
 362                 s->block_last_index[i] = -1;
 363             s->mv_dir = MV_DIR_FORWARD;
 364             s->mv_type = MV_TYPE_16X16;
 365             s->mv[0][0][0] = 0;
 366             s->mv[0][0][1] = 0;
 367             s->mb_skipped = 1;
 368             w->hshift=0;
 369             return 0;
 370         }
 371
 372         code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index].table, MB_NON_INTRA_VLC_BITS, 3);
 373         if (code < 0)
 374             return -1;
 375         s->mb_intra = (~code & 0x40) >> 6;
 376
 377         cbp = code & 0x3f;
 378     } else {
 379         s->mb_intra = 1;
 380         code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
 381         if (code < 0){
 382             av_log(s->avctx, AV_LOG_ERROR, "II-cbp illegal at %d %d\n", s->mb_x, s->mb_y);
 383             return -1;
 384         }
 385         /* predict coded block pattern */
 386         cbp = 0;
 387         for(i=0;i<6;i++) {
 388             int val = ((code >> (5 - i)) & 1);
 389             if (i < 4) {
 390                 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
 391                 val = val ^ pred;
 392                 *coded_val = val;
 393             }
 394             cbp |= val << (5 - i);
 395         }
 396     }
 397
 398     if (!s->mb_intra) {
 399         int mx, my;
 400 //printf("P at %d %d\n", s->mb_x, s->mb_y);
 401         wmv2_pred_motion(w, &mx, &my);
 402
 403         if(cbp){
 404             s->dsp.clear_blocks(s->block[0]);
 405             if(s->per_mb_rl_table){
 406                 s->rl_table_index = decode012(&s->gb);
 407                 s->rl_chroma_table_index = s->rl_table_index;
 408             }
 409
 410             if(w->abt_flag && w->per_mb_abt){
 411                 w->per_block_abt= get_bits1(&s->gb);
 412                 if(!w->per_block_abt)
 413                     w->abt_type= decode012(&s->gb);
 414             }else
 415                 w->per_block_abt=0;
 416         }
 417
 418         if (wmv2_decode_motion(w, &mx, &my) < 0)
 419             return -1;
 420
 421         s->mv_dir = MV_DIR_FORWARD;
 422         s->mv_type = MV_TYPE_16X16;
 423         s->mv[0][0][0] = mx;
 424         s->mv[0][0][1] = my;
 425
 426         for (i = 0; i < 6; i++) {
 427             if (wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1) < 0)
 428             {
 429                 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding inter block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
 430                 return -1;
 431             }
 432         }
 433     } else {
 434 //if(s->pict_type==FF_P_TYPE)
 435 //   printf("%d%d ", s->inter_intra_pred, cbp);
 436 //printf("I at %d %d %d %06X\n", s->mb_x, s->mb_y, ((cbp&3)? 1 : 0) +((cbp&0x3C)? 2 : 0), show_bits(&s->gb, 24));
 437         s->ac_pred = get_bits1(&s->gb);
 438         if(s->inter_intra_pred){
 439             s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
 440 //            printf("%d%d %d %d/", s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
 441         }
 442         if(s->per_mb_rl_table && cbp){
 443             s->rl_table_index = decode012(&s->gb);
 444             s->rl_chroma_table_index = s->rl_table_index;
 445         }
 446
 447         s->dsp.clear_blocks(s->block[0]);
 448         for (i = 0; i < 6; i++) {
 449             if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
 450             {
 451                 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding intra block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
 452                 return -1;
 453             }
 454         }
 455     }
 456
 457     return 0;
 458 }
 459
 460 static av_cold int wmv2_decode_init(AVCodecContext *avctx){
 461     Wmv2Context * const w= avctx->priv_data;
 462
 463     if(avctx->idct_algo==FF_IDCT_AUTO){
 464         avctx->idct_algo=FF_IDCT_WMV2;
 465     }
 466
 467     if(ff_h263_decode_init(avctx) < 0)
 468         return -1;
 469
 470     ff_wmv2_common_init(w);
 471
 472     ff_intrax8_common_init(&w->x8,&w->s);
 473
 474     return 0;
 475 }
 476
 477 static av_cold int wmv2_decode_end(AVCodecContext *avctx)
 478 {
 479     Wmv2Context *w = avctx->priv_data;
 480
 481     ff_intrax8_common_end(&w->x8);
 482     return ff_h263_decode_end(avctx);
 483 }
 484
 485 AVCodec wmv2_decoder = {
 486     "wmv2",
 487     CODEC_TYPE_VIDEO,
 488     CODEC_ID_WMV2,
 489     sizeof(Wmv2Context),
 490     wmv2_decode_init,
 491     NULL,
 492     wmv2_decode_end,
 493     ff_h263_decode_frame,
 494     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 495     .long_name = "Windows Media Video 8",
 496 };