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 "mathops.h"
  25 #include "msmpeg4.h"
  26 #include "msmpeg4data.h"
  27 #include "intrax8.h"
  28 #include "wmv2.h"
  29
  30
  31 static void parse_mb_skip(Wmv2Context * w){
  32     int mb_x, mb_y;
  33     MpegEncContext * const s= &w->s;
  34     uint32_t * const mb_type= s->current_picture_ptr->mb_type;
  35
  36     w->skip_type= get_bits(&s->gb, 2);
  37     switch(w->skip_type){
  38     case SKIP_TYPE_NONE:
  39         for(mb_y=0; mb_y<s->mb_height; mb_y++){
  40             for(mb_x=0; mb_x<s->mb_width; mb_x++){
  41                 mb_type[mb_y*s->mb_stride + mb_x]= MB_TYPE_16x16 | MB_TYPE_L0;
  42             }
  43         }
  44         break;
  45     case SKIP_TYPE_MPEG:
  46         for(mb_y=0; mb_y<s->mb_height; mb_y++){
  47             for(mb_x=0; mb_x<s->mb_width; mb_x++){
  48                 mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
  49             }
  50         }
  51         break;
  52     case SKIP_TYPE_ROW:
  53         for(mb_y=0; mb_y<s->mb_height; mb_y++){
  54             if(get_bits1(&s->gb)){
  55                 for(mb_x=0; mb_x<s->mb_width; mb_x++){
  56                     mb_type[mb_y*s->mb_stride + mb_x]=  MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
  57                 }
  58             }else{
  59                 for(mb_x=0; mb_x<s->mb_width; mb_x++){
  60                     mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
  61                 }
  62             }
  63         }
  64         break;
  65     case SKIP_TYPE_COL:
  66         for(mb_x=0; mb_x<s->mb_width; mb_x++){
  67             if(get_bits1(&s->gb)){
  68                 for(mb_y=0; mb_y<s->mb_height; mb_y++){
  69                     mb_type[mb_y*s->mb_stride + mb_x]=  MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
  70                 }
  71             }else{
  72                 for(mb_y=0; mb_y<s->mb_height; mb_y++){
  73                     mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
  74                 }
  75             }
  76         }
  77         break;
  78     }
  79 }
  80
  81 static int decode_ext_header(Wmv2Context *w){
  82     MpegEncContext * const s= &w->s;
  83     GetBitContext gb;
  84     int fps;
  85     int code;
  86
  87     if(s->avctx->extradata_size<4) return -1;
  88
  89     init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
  90
  91     fps                = get_bits(&gb, 5);
  92     s->bit_rate        = get_bits(&gb, 11)*1024;
  93     w->mspel_bit       = get_bits1(&gb);
  94     s->loop_filter     = get_bits1(&gb);
  95     w->abt_flag        = get_bits1(&gb);
  96     w->j_type_bit      = get_bits1(&gb);
  97     w->top_left_mv_flag= get_bits1(&gb);
  98     w->per_mb_rl_bit   = get_bits1(&gb);
  99     code               = get_bits(&gb, 3);
 100
 101     if(code==0) return -1;
 102
 103     s->slice_height = s->mb_height / code;
 104
 105     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 106         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",
 107         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,
 108         code);
 109     }
 110     return 0;
 111 }
 112
 113 int ff_wmv2_decode_picture_header(MpegEncContext * s)
 114 {
 115     Wmv2Context * const w= (Wmv2Context*)s;
 116     int code;
 117
 118 #if 0
 119 {
 120 int i;
 121 for(i=0; i<s->gb.size*8; i++)
 122     printf("%d", get_bits1(&s->gb));
 123 //    get_bits1(&s->gb);
 124 printf("END\n");
 125 return -1;
 126 }
 127 #endif
 128     if(s->picture_number==0)
 129         decode_ext_header(w);
 130
 131     s->pict_type = get_bits1(&s->gb) + 1;
 132     if(s->pict_type == FF_I_TYPE){
 133         code = get_bits(&s->gb, 7);
 134         av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code);
 135     }
 136     s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
 137     if(s->qscale <= 0)
 138        return -1;
 139
 140     return 0;
 141 }
 142
 143 int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s)
 144 {
 145     Wmv2Context * const w= (Wmv2Context*)s;
 146
 147     if (s->pict_type == FF_I_TYPE) {
 148         if(w->j_type_bit) w->j_type= get_bits1(&s->gb);
 149         else              w->j_type= 0; //FIXME check
 150
 151         if(!w->j_type){
 152             if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb);
 153             else                 s->per_mb_rl_table= 0;
 154
 155             if(!s->per_mb_rl_table){
 156                 s->rl_chroma_table_index = decode012(&s->gb);
 157                 s->rl_table_index = decode012(&s->gb);
 158             }
 159
 160             s->dc_table_index = get_bits1(&s->gb);
 161         }
 162         s->inter_intra_pred= 0;
 163         s->no_rounding = 1;
 164         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 165             av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n",
 166                 s->qscale,
 167                 s->rl_chroma_table_index,
 168                 s->rl_table_index,
 169                 s->dc_table_index,
 170                 s->per_mb_rl_table,
 171                 w->j_type);
 172         }
 173     }else{
 174         int cbp_index;
 175         w->j_type=0;
 176
 177         parse_mb_skip(w);
 178         cbp_index= decode012(&s->gb);
 179         if(s->qscale <= 10){
 180             int map[3]= {0,2,1};
 181             w->cbp_table_index= map[cbp_index];
 182         }else if(s->qscale <= 20){
 183             int map[3]= {1,0,2};
 184             w->cbp_table_index= map[cbp_index];
 185         }else{
 186             int map[3]= {2,1,0};
 187             w->cbp_table_index= map[cbp_index];
 188         }
 189
 190         if(w->mspel_bit) s->mspel= get_bits1(&s->gb);
 191         else             s->mspel= 0; //FIXME check
 192
 193         if(w->abt_flag){
 194             w->per_mb_abt= get_bits1(&s->gb)^1;
 195             if(!w->per_mb_abt){
 196                 w->abt_type= decode012(&s->gb);
 197             }
 198         }
 199
 200         if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb);
 201         else                 s->per_mb_rl_table= 0;
 202
 203         if(!s->per_mb_rl_table){
 204             s->rl_table_index = decode012(&s->gb);
 205             s->rl_chroma_table_index = s->rl_table_index;
 206         }
 207
 208         s->dc_table_index = get_bits1(&s->gb);
 209         s->mv_table_index = get_bits1(&s->gb);
 210
 211         s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
 212         s->no_rounding ^= 1;
 213
 214         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 215             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",
 216                 s->rl_table_index,
 217                 s->rl_chroma_table_index,
 218                 s->dc_table_index,
 219                 s->mv_table_index,
 220                 s->per_mb_rl_table,
 221                 s->qscale,
 222                 s->mspel,
 223                 w->per_mb_abt,
 224                 w->abt_type,
 225                 w->cbp_table_index,
 226                 s->inter_intra_pred);
 227         }
 228     }
 229     s->esc3_level_length= 0;
 230     s->esc3_run_length= 0;
 231
 232 s->picture_number++; //FIXME ?
 233
 234
 235     if(w->j_type){
 236         ff_intrax8_decode_picture(&w->x8, 2*s->qscale, (s->qscale-1)|1 );
 237         return 1;
 238     }
 239
 240     return 0;
 241 }
 242
 243 static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr){
 244     MpegEncContext * const s= &w->s;
 245     int ret;
 246
 247     ret= ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);
 248
 249     if(ret<0) return -1;
 250
 251     if((((*mx_ptr)|(*my_ptr)) & 1) && s->mspel)
 252         w->hshift= get_bits1(&s->gb);
 253     else
 254         w->hshift= 0;
 255
 256 //printf("%d %d  ", *mx_ptr, *my_ptr);
 257
 258     return 0;
 259 }
 260
 261 static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py){
 262     MpegEncContext * const s= &w->s;
 263     int xy, wrap, diff, type;
 264     int16_t *A, *B, *C, *mot_val;
 265
 266     wrap = s->b8_stride;
 267     xy = s->block_index[0];
 268
 269     mot_val = s->current_picture.motion_val[0][xy];
 270
 271     A = s->current_picture.motion_val[0][xy - 1];
 272     B = s->current_picture.motion_val[0][xy - wrap];
 273     C = s->current_picture.motion_val[0][xy + 2 - wrap];
 274
 275     if(s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag)
 276         diff= FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1]));
 277     else
 278         diff=0;
 279
 280     if(diff >= 8)
 281         type= get_bits1(&s->gb);
 282     else
 283         type= 2;
 284
 285     if(type == 0){
 286         *px= A[0];
 287         *py= A[1];
 288     }else if(type == 1){
 289         *px= B[0];
 290         *py= B[1];
 291     }else{
 292         /* special case for first (slice) line */
 293         if (s->first_slice_line) {
 294             *px = A[0];
 295             *py = A[1];
 296         } else {
 297             *px = mid_pred(A[0], B[0], C[0]);
 298             *py = mid_pred(A[1], B[1], C[1]);
 299         }
 300     }
 301
 302     return mot_val;
 303 }
 304
 305 static inline int wmv2_decode_inter_block(Wmv2Context *w, DCTELEM *block, int n, int cbp){
 306     MpegEncContext * const s= &w->s;
 307     static const int sub_cbp_table[3]= {2,3,1};
 308     int sub_cbp;
 309
 310     if(!cbp){
 311         s->block_last_index[n] = -1;
 312
 313         return 0;
 314     }
 315
 316     if(w->per_block_abt)
 317         w->abt_type= decode012(&s->gb);
 318 #if 0
 319     if(w->per_block_abt)
 320         printf("B%d", w->abt_type);
 321 #endif
 322     w->abt_type_table[n]= w->abt_type;
 323
 324     if(w->abt_type){
 325 //        const uint8_t *scantable= w->abt_scantable[w->abt_type-1].permutated;
 326         const uint8_t *scantable= w->abt_scantable[w->abt_type-1].scantable;
 327 //        const uint8_t *scantable= w->abt_type-1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable;
 328
 329         sub_cbp= sub_cbp_table[ decode012(&s->gb) ];
 330 //        printf("S%d", sub_cbp);
 331
 332         if(sub_cbp&1){
 333             if (ff_msmpeg4_decode_block(s, block, n, 1, scantable) < 0)
 334                 return -1;
 335         }
 336
 337         if(sub_cbp&2){
 338             if (ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable) < 0)
 339                 return -1;
 340         }
 341         s->block_last_index[n] = 63;
 342
 343         return 0;
 344     }else{
 345         return ff_msmpeg4_decode_block(s, block, n, 1, s->inter_scantable.permutated);
 346     }
 347 }
 348
 349
 350 int ff_wmv2_decode_mb(MpegEncContext *s, DCTELEM block[6][64])
 351 {
 352     Wmv2Context * const w= (Wmv2Context*)s;
 353     int cbp, code, i;
 354     uint8_t *coded_val;
 355
 356     if(w->j_type) return 0;
 357
 358     if (s->pict_type == FF_P_TYPE) {
 359         if(IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])){
 360             /* skip mb */
 361             s->mb_intra = 0;
 362             for(i=0;i<6;i++)
 363                 s->block_last_index[i] = -1;
 364             s->mv_dir = MV_DIR_FORWARD;
 365             s->mv_type = MV_TYPE_16X16;
 366             s->mv[0][0][0] = 0;
 367             s->mv[0][0][1] = 0;
 368             s->mb_skipped = 1;
 369             w->hshift=0;
 370             return 0;
 371         }
 372
 373         code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index].table, MB_NON_INTRA_VLC_BITS, 3);
 374         if (code < 0)
 375             return -1;
 376         s->mb_intra = (~code & 0x40) >> 6;
 377
 378         cbp = code & 0x3f;
 379     } else {
 380         s->mb_intra = 1;
 381         code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
 382         if (code < 0){
 383             av_log(s->avctx, AV_LOG_ERROR, "II-cbp illegal at %d %d\n", s->mb_x, s->mb_y);
 384             return -1;
 385         }
 386         /* predict coded block pattern */
 387         cbp = 0;
 388         for(i=0;i<6;i++) {
 389             int val = ((code >> (5 - i)) & 1);
 390             if (i < 4) {
 391                 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
 392                 val = val ^ pred;
 393                 *coded_val = val;
 394             }
 395             cbp |= val << (5 - i);
 396         }
 397     }
 398
 399     if (!s->mb_intra) {
 400         int mx, my;
 401 //printf("P at %d %d\n", s->mb_x, s->mb_y);
 402         wmv2_pred_motion(w, &mx, &my);
 403
 404         if(cbp){
 405             s->dsp.clear_blocks(s->block[0]);
 406             if(s->per_mb_rl_table){
 407                 s->rl_table_index = decode012(&s->gb);
 408                 s->rl_chroma_table_index = s->rl_table_index;
 409             }
 410
 411             if(w->abt_flag && w->per_mb_abt){
 412                 w->per_block_abt= get_bits1(&s->gb);
 413                 if(!w->per_block_abt)
 414                     w->abt_type= decode012(&s->gb);
 415             }else
 416                 w->per_block_abt=0;
 417         }
 418
 419         if (wmv2_decode_motion(w, &mx, &my) < 0)
 420             return -1;
 421
 422         s->mv_dir = MV_DIR_FORWARD;
 423         s->mv_type = MV_TYPE_16X16;
 424         s->mv[0][0][0] = mx;
 425         s->mv[0][0][1] = my;
 426
 427         for (i = 0; i < 6; i++) {
 428             if (wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1) < 0)
 429             {
 430                 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding inter block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
 431                 return -1;
 432             }
 433         }
 434     } else {
 435 //if(s->pict_type==FF_P_TYPE)
 436 //   printf("%d%d ", s->inter_intra_pred, cbp);
 437 //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));
 438         s->ac_pred = get_bits1(&s->gb);
 439         if(s->inter_intra_pred){
 440             s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
 441 //            printf("%d%d %d %d/", s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
 442         }
 443         if(s->per_mb_rl_table && cbp){
 444             s->rl_table_index = decode012(&s->gb);
 445             s->rl_chroma_table_index = s->rl_table_index;
 446         }
 447
 448         s->dsp.clear_blocks(s->block[0]);
 449         for (i = 0; i < 6; i++) {
 450             if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
 451             {
 452                 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding intra block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
 453                 return -1;
 454             }
 455         }
 456     }
 457
 458     return 0;
 459 }
 460
 461 static av_cold int wmv2_decode_init(AVCodecContext *avctx){
 462     Wmv2Context * const w= avctx->priv_data;
 463
 464     if(avctx->idct_algo==FF_IDCT_AUTO){
 465         avctx->idct_algo=FF_IDCT_WMV2;
 466     }
 467
 468     if(ff_h263_decode_init(avctx) < 0)
 469         return -1;
 470
 471     ff_wmv2_common_init(w);
 472
 473     ff_intrax8_common_init(&w->x8,&w->s);
 474
 475     return 0;
 476 }
 477
 478 static av_cold int wmv2_decode_end(AVCodecContext *avctx)
 479 {
 480     Wmv2Context *w = avctx->priv_data;
 481
 482     ff_intrax8_common_end(&w->x8);
 483     return ff_h263_decode_end(avctx);
 484 }
 485
 486 AVCodec wmv2_decoder = {
 487     "wmv2",
 488     CODEC_TYPE_VIDEO,
 489     CODEC_ID_WMV2,
 490     sizeof(Wmv2Context),
 491     wmv2_decode_init,
 492     NULL,
 493     wmv2_decode_end,
 494     ff_h263_decode_frame,
 495     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 496     .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
 497     .pix_fmts= ff_pixfmt_list_420,
 498 };