git.sesse.net Git - ffmpeg/blob - libavcodec/mpeg12.c

   1 /*
   2  * MPEG1 codec / MPEG2 decoder
   3  * Copyright (c) 2000,2001 Fabrice Bellard.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 /**
  21  * @file mpeg12.c
  22  * MPEG1/2 codec
  23  */
  24
  25 //#define DEBUG
  26 #include "avcodec.h"
  27 #include "dsputil.h"
  28 #include "mpegvideo.h"
  29
  30 #include "mpeg12data.h"
  31
  32
  33 /* Start codes. */
  34 #define SEQ_END_CODE            0x000001b7
  35 #define SEQ_START_CODE          0x000001b3
  36 #define GOP_START_CODE          0x000001b8
  37 #define PICTURE_START_CODE      0x00000100
  38 #define SLICE_MIN_START_CODE    0x00000101
  39 #define SLICE_MAX_START_CODE    0x000001af
  40 #define EXT_START_CODE          0x000001b5
  41 #define USER_START_CODE         0x000001b2
  42
  43 #define DC_VLC_BITS 9
  44 #define MV_VLC_BITS 9
  45 #define MBINCR_VLC_BITS 9
  46 #define MB_PAT_VLC_BITS 9
  47 #define MB_PTYPE_VLC_BITS 6
  48 #define MB_BTYPE_VLC_BITS 6
  49 #define TEX_VLC_BITS 9
  50
  51 #ifdef CONFIG_ENCODERS
  52 static void mpeg1_encode_block(MpegEncContext *s,
  53                          DCTELEM *block,
  54                          int component);
  55 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
  56 #endif //CONFIG_ENCODERS
  57 static void mpeg1_skip_picture(MpegEncContext *s, int pict_num);
  58 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
  59                               DCTELEM *block,
  60                               int n);
  61 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
  62                               DCTELEM *block,
  63                               int n);
  64 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
  65                                         DCTELEM *block,
  66                                         int n);
  67 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
  68                                     DCTELEM *block,
  69                                     int n);
  70 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
  71 static void exchange_uv(MpegEncContext *s);
  72
  73 #ifdef HAVE_XVMC
  74 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
  75 extern int XVMC_field_end(MpegEncContext *s);
  76 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
  77 extern void XVMC_init_block(MpegEncContext *s);//set s->block
  78 #endif
  79
  80 #ifdef CONFIG_ENCODERS
  81 static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
  82 static uint8_t fcode_tab[MAX_MV*2+1];
  83
  84 static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
  85 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
  86
  87 /* simple include everything table for dc, first byte is bits number next 3 are code*/
  88 static uint32_t mpeg1_lum_dc_uni[512];
  89 static uint32_t mpeg1_chr_dc_uni[512];
  90
  91 static uint8_t mpeg1_index_run[2][64];
  92 static int8_t mpeg1_max_level[2][64];
  93 #endif //CONFIG_ENCODERS
  94
  95 static void init_2d_vlc_rl(RLTable *rl)
  96 {
  97     int i;
  98
  99     init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
 100              &rl->table_vlc[0][1], 4, 2,
 101              &rl->table_vlc[0][0], 4, 2);
 102
 103
 104     rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
 105     for(i=0; i<rl->vlc.table_size; i++){
 106         int code= rl->vlc.table[i][0];
 107         int len = rl->vlc.table[i][1];
 108         int level, run;
 109
 110         if(len==0){ // illegal code
 111             run= 65;
 112             level= MAX_LEVEL;
 113         }else if(len<0){ //more bits needed
 114             run= 0;
 115             level= code;
 116         }else{
 117             if(code==rl->n){ //esc
 118                 run= 65;
 119                 level= 0;
 120             }else if(code==rl->n+1){ //eob
 121                 run= 0;
 122                 level= 127;
 123             }else{
 124                 run=   rl->table_run  [code] + 1;
 125                 level= rl->table_level[code];
 126             }
 127         }
 128         rl->rl_vlc[0][i].len= len;
 129         rl->rl_vlc[0][i].level= level;
 130         rl->rl_vlc[0][i].run= run;
 131     }
 132 }
 133
 134 #ifdef CONFIG_ENCODERS
 135 static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
 136     int i;
 137
 138     for(i=0; i<128; i++){
 139         int level= i-64;
 140         int run;
 141         for(run=0; run<64; run++){
 142             int len, bits, code;
 143
 144             int alevel= ABS(level);
 145             int sign= (level>>31)&1;
 146
 147             if (alevel > rl->max_level[0][run])
 148                 code= 111; /*rl->n*/
 149             else
 150                 code= rl->index_run[0][run] + alevel - 1;
 151
 152             if (code < 111 /* rl->n */) {
 153                 /* store the vlc & sign at once */
 154                 len=   mpeg1_vlc[code][1]+1;
 155                 bits= (mpeg1_vlc[code][0]<<1) + sign;
 156             } else {
 157                 len=  mpeg1_vlc[111/*rl->n*/][1]+6;
 158                 bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
 159
 160                 bits|= run;
 161                 if (alevel < 128) {
 162                     bits<<=8; len+=8;
 163                     bits|= level & 0xff;
 164                 } else {
 165                     bits<<=16; len+=16;
 166                     bits|= level & 0xff;
 167                     if (level < 0) {
 168                         bits|= 0x8001 + level + 255;
 169                     } else {
 170                         bits|= level & 0xffff;
 171                     }
 172                 }
 173             }
 174
 175             uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
 176             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
 177         }
 178     }
 179 }
 180
 181 static void put_header(MpegEncContext *s, int header)
 182 {
 183     align_put_bits(&s->pb);
 184     put_bits(&s->pb, 16, header>>16);
 185     put_bits(&s->pb, 16, header&0xFFFF);
 186 }
 187
 188 /* put sequence header if needed */
 189 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 190 {
 191         unsigned int vbv_buffer_size;
 192         unsigned int fps, v;
 193         int n, i;
 194         uint64_t time_code;
 195         float best_aspect_error= 1E10;
 196         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 197         int constraint_parameter_flag;
 198
 199         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 200
 201         if (s->current_picture.key_frame) {
 202             /* mpeg1 header repeated every gop */
 203             put_header(s, SEQ_START_CODE);
 204
 205             /* search closest frame rate */
 206             {
 207                 int i, dmin, d;
 208                 s->frame_rate_index = 0;
 209                 dmin = 0x7fffffff;
 210                 for(i=1;i<14;i++) {
 211                     if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
 212
 213                     d = abs(MPEG1_FRAME_RATE_BASE*(int64_t)s->avctx->frame_rate/s->avctx->frame_rate_base - frame_rate_tab[i]);
 214                     if (d < dmin) {
 215                         dmin = d;
 216                         s->frame_rate_index = i;
 217                     }
 218                 }
 219             }
 220
 221             put_bits(&s->pb, 12, s->width);
 222             put_bits(&s->pb, 12, s->height);
 223
 224             for(i=1; i<15; i++){
 225                 float error= aspect_ratio;
 226                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
 227                     error-= 1.0/mpeg1_aspect[i];
 228                 else
 229                     error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
 230
 231                 error= ABS(error);
 232
 233                 if(error < best_aspect_error){
 234                     best_aspect_error= error;
 235                     s->aspect_ratio_info= i;
 236                 }
 237             }
 238
 239             put_bits(&s->pb, 4, s->aspect_ratio_info);
 240             put_bits(&s->pb, 4, s->frame_rate_index);
 241
 242             if(s->avctx->rc_max_rate){
 243                 v = (s->avctx->rc_max_rate + 399) / 400;
 244                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
 245                     v = 0x3ffff;
 246             }else{
 247                 v= 0x3FFFF;
 248             }
 249
 250             if(s->avctx->rc_buffer_size)
 251                 vbv_buffer_size = s->avctx->rc_buffer_size;
 252             else
 253                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 254                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 255             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 256
 257             put_bits(&s->pb, 18, v & 0x3FFFF);
 258             put_bits(&s->pb, 1, 1); /* marker */
 259             put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
 260
 261             constraint_parameter_flag=
 262                 s->width <= 768 && s->height <= 576 &&
 263                 s->mb_width * s->mb_height <= 396 &&
 264                 s->mb_width * s->mb_height * frame_rate_tab[s->frame_rate_index] <= MPEG1_FRAME_RATE_BASE*396*25 &&
 265                 frame_rate_tab[s->frame_rate_index] <= MPEG1_FRAME_RATE_BASE*30 &&
 266                 vbv_buffer_size <= 20 &&
 267                 v <= 1856000/400 &&
 268                 s->codec_id == CODEC_ID_MPEG1VIDEO;
 269
 270             put_bits(&s->pb, 1, constraint_parameter_flag);
 271
 272             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 273             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 274
 275             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 276                 put_header(s, EXT_START_CODE);
 277                 put_bits(&s->pb, 4, 1); //seq ext
 278                 put_bits(&s->pb, 1, 0); //esc
 279                 put_bits(&s->pb, 3, 4); //profile
 280                 put_bits(&s->pb, 4, 8); //level
 281                 put_bits(&s->pb, 1, s->progressive_sequence);
 282                 put_bits(&s->pb, 2, 1); //chroma format 4:2:0
 283                 put_bits(&s->pb, 2, 0); //horizontal size ext
 284                 put_bits(&s->pb, 2, 0); //vertical size ext
 285                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 286                 put_bits(&s->pb, 1, 1); //marker
 287                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 288                 put_bits(&s->pb, 1, s->low_delay);
 289                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
 290                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
 291             }
 292
 293             put_header(s, GOP_START_CODE);
 294             put_bits(&s->pb, 1, 0); /* do drop frame */
 295             /* time code : we must convert from the real frame rate to a
 296                fake mpeg frame rate in case of low frame rate */
 297             fps = frame_rate_tab[s->frame_rate_index];
 298             time_code = (int64_t)s->fake_picture_number * MPEG1_FRAME_RATE_BASE;
 299             s->gop_picture_number = s->fake_picture_number;
 300             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 301             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 302             put_bits(&s->pb, 1, 1);
 303             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 304             put_bits(&s->pb, 6, (uint32_t)((time_code % fps) / MPEG1_FRAME_RATE_BASE));
 305             put_bits(&s->pb, 1, 0); /* closed gop */
 306             put_bits(&s->pb, 1, 0); /* broken link */
 307         }
 308
 309         if (s->avctx->frame_rate < (24 * s->avctx->frame_rate_base) && s->picture_number > 0) {
 310             /* insert empty P pictures to slow down to the desired
 311                frame rate. Each fake pictures takes about 20 bytes */
 312             fps = frame_rate_tab[s->frame_rate_index];
 313             n = av_rescale((int64_t)s->picture_number * s->avctx->frame_rate_base, fps, s->avctx->frame_rate) / MPEG1_FRAME_RATE_BASE - 1;
 314             while (s->fake_picture_number < n) {
 315                 mpeg1_skip_picture(s, s->fake_picture_number -
 316                                    s->gop_picture_number);
 317                 s->fake_picture_number++;
 318             }
 319
 320         }
 321 }
 322
 323 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 324     while (run >= 33) {
 325         put_bits(&s->pb, 11, 0x008);
 326         run -= 33;
 327     }
 328     put_bits(&s->pb, mbAddrIncrTable[run][1],
 329              mbAddrIncrTable[run][0]);
 330 }
 331
 332 /* insert a fake P picture */
 333 static void mpeg1_skip_picture(MpegEncContext *s, int pict_num)
 334 {
 335     assert(s->codec_id == CODEC_ID_MPEG1VIDEO); // mpeg2 can do these repeat things
 336
 337     /* mpeg1 picture header */
 338     put_header(s, PICTURE_START_CODE);
 339     /* temporal reference */
 340     put_bits(&s->pb, 10, pict_num & 0x3ff);
 341
 342     put_bits(&s->pb, 3, P_TYPE);
 343     put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
 344
 345     put_bits(&s->pb, 1, 1); /* integer coordinates */
 346     put_bits(&s->pb, 3, 1); /* forward_f_code */
 347
 348     put_bits(&s->pb, 1, 0); /* extra bit picture */
 349
 350     /* only one slice */
 351     put_header(s, SLICE_MIN_START_CODE);
 352     put_bits(&s->pb, 5, 1); /* quantizer scale */
 353     put_bits(&s->pb, 1, 0); /* slice extra information */
 354
 355     encode_mb_skip_run(s, 0);
 356
 357     /* empty macroblock */
 358     put_bits(&s->pb, 3, 1); /* motion only */
 359
 360     /* zero motion x & y */
 361     put_bits(&s->pb, 1, 1);
 362     put_bits(&s->pb, 1, 1);
 363
 364     /* output a number of empty slice */
 365     encode_mb_skip_run(s, s->mb_width * s->mb_height - 2);
 366
 367     /* empty macroblock */
 368     put_bits(&s->pb, 3, 1); /* motion only */
 369
 370     /* zero motion x & y */
 371     put_bits(&s->pb, 1, 1);
 372     put_bits(&s->pb, 1, 1);
 373 }
 374 #endif //CONFIG_ENCODERS
 375
 376 static void common_init(MpegEncContext *s)
 377 {
 378     s->y_dc_scale_table=
 379     s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
 380 }
 381
 382 void ff_mpeg1_clean_buffers(MpegEncContext *s){
 383     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
 384     s->last_dc[1] = s->last_dc[0];
 385     s->last_dc[2] = s->last_dc[0];
 386     memset(s->last_mv, 0, sizeof(s->last_mv));
 387 }
 388
 389 #ifdef CONFIG_ENCODERS
 390
 391 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 392     put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 393     put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
 394     put_bits(&s->pb, 1, 0); /* slice extra information */
 395 }
 396
 397 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 398 {
 399     mpeg1_encode_sequence_header(s);
 400
 401     /* mpeg1 picture header */
 402     put_header(s, PICTURE_START_CODE);
 403     /* temporal reference */
 404
 405     // RAL: s->picture_number instead of s->fake_picture_number
 406     put_bits(&s->pb, 10, (s->picture_number -
 407                           s->gop_picture_number) & 0x3ff);
 408     s->fake_picture_number++;
 409
 410     put_bits(&s->pb, 3, s->pict_type);
 411     put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
 412
 413     // RAL: Forward f_code also needed for B frames
 414     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
 415         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 416         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 417             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 418         else
 419             put_bits(&s->pb, 3, 7); /* forward_f_code */
 420     }
 421
 422     // RAL: Backward f_code necessary for B frames
 423     if (s->pict_type == B_TYPE) {
 424         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 425         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 426             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 427         else
 428             put_bits(&s->pb, 3, 7); /* backward_f_code */
 429     }
 430
 431     put_bits(&s->pb, 1, 0); /* extra bit picture */
 432
 433     s->frame_pred_frame_dct = 1;
 434     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 435         put_header(s, EXT_START_CODE);
 436         put_bits(&s->pb, 4, 8); //pic ext
 437         if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
 438             put_bits(&s->pb, 4, s->f_code);
 439             put_bits(&s->pb, 4, s->f_code);
 440         }else{
 441             put_bits(&s->pb, 8, 255);
 442         }
 443         if (s->pict_type == B_TYPE) {
 444             put_bits(&s->pb, 4, s->b_code);
 445             put_bits(&s->pb, 4, s->b_code);
 446         }else{
 447             put_bits(&s->pb, 8, 255);
 448         }
 449         put_bits(&s->pb, 2, s->intra_dc_precision);
 450         put_bits(&s->pb, 2, s->picture_structure= PICT_FRAME);
 451         if (s->progressive_sequence) {
 452             put_bits(&s->pb, 1, 0); /* no repeat */
 453         } else {
 454             put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
 455         }
 456         /* XXX: optimize the generation of this flag with entropy
 457            measures */
 458         s->frame_pred_frame_dct = s->progressive_sequence;
 459
 460         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 461         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 462         put_bits(&s->pb, 1, s->q_scale_type);
 463         put_bits(&s->pb, 1, s->intra_vlc_format);
 464         put_bits(&s->pb, 1, s->alternate_scan);
 465         put_bits(&s->pb, 1, s->repeat_first_field);
 466         put_bits(&s->pb, 1, s->chroma_420_type=1);
 467         s->progressive_frame = s->progressive_sequence;
 468         put_bits(&s->pb, 1, s->progressive_frame);
 469         put_bits(&s->pb, 1, 0); //composite_display_flag
 470     }
 471
 472     s->mb_y=0;
 473     ff_mpeg1_encode_slice_header(s);
 474 }
 475
 476 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 477                                 int has_mv)
 478 {
 479     put_bits(&s->pb, n, bits);
 480     if (!s->frame_pred_frame_dct) {
 481         if (has_mv)
 482             put_bits(&s->pb, 2, 2); /* motion_type: frame */
 483         put_bits(&s->pb, 1, s->interlaced_dct);
 484     }
 485 }
 486
 487 void mpeg1_encode_mb(MpegEncContext *s,
 488                      DCTELEM block[6][64],
 489                      int motion_x, int motion_y)
 490 {
 491     int i, cbp;
 492     const int mb_x = s->mb_x;
 493     const int mb_y = s->mb_y;
 494     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 495
 496     /* compute cbp */
 497     cbp = 0;
 498     for(i=0;i<6;i++) {
 499         if (s->block_last_index[i] >= 0)
 500             cbp |= 1 << (5 - i);
 501     }
 502
 503     if (cbp == 0 && !first_mb && (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
 504         ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
 505         (s->pict_type == B_TYPE && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
 506         ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
 507         s->mb_skip_run++;
 508         s->qscale -= s->dquant;
 509         s->skip_count++;
 510         s->misc_bits++;
 511         s->last_bits++;
 512     } else {
 513         if(first_mb){
 514             assert(s->mb_skip_run == 0);
 515             encode_mb_skip_run(s, s->mb_x);
 516         }else{
 517             encode_mb_skip_run(s, s->mb_skip_run);
 518         }
 519
 520         if (s->pict_type == I_TYPE) {
 521             if(s->dquant && cbp){
 522                 put_mb_modes(s, 2, 1, 0); /* macroblock_type : macroblock_quant = 1 */
 523                 put_bits(&s->pb, 5, s->qscale);
 524             }else{
 525                 put_mb_modes(s, 1, 1, 0); /* macroblock_type : macroblock_quant = 0 */
 526                 s->qscale -= s->dquant;
 527             }
 528             s->misc_bits+= get_bits_diff(s);
 529             s->i_count++;
 530         } else if (s->mb_intra) {
 531             if(s->dquant && cbp){
 532                 put_mb_modes(s, 6, 0x01, 0);
 533                 put_bits(&s->pb, 5, s->qscale);
 534             }else{
 535                 put_mb_modes(s, 5, 0x03, 0);
 536                 s->qscale -= s->dquant;
 537             }
 538             s->misc_bits+= get_bits_diff(s);
 539             s->i_count++;
 540             s->last_mv[0][0][0] =
 541             s->last_mv[0][0][1] = 0;
 542         } else if (s->pict_type == P_TYPE) {
 543                 if (cbp != 0) {
 544                     if (motion_x == 0 && motion_y == 0) {
 545                         if(s->dquant){
 546                             put_mb_modes(s, 5, 1, 0); /* macroblock_pattern & quant */
 547                             put_bits(&s->pb, 5, s->qscale);
 548                         }else{
 549                             put_mb_modes(s, 2, 1, 0); /* macroblock_pattern only */
 550                         }
 551                         s->misc_bits+= get_bits_diff(s);
 552                         put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
 553                     } else {
 554                         if(s->dquant){
 555                             put_mb_modes(s, 5, 2, 1); /* motion + cbp */
 556                             put_bits(&s->pb, 5, s->qscale);
 557                         }else{
 558                             put_mb_modes(s, 1, 1, 1); /* motion + cbp */
 559                         }
 560                         s->misc_bits+= get_bits_diff(s);
 561                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 562                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 563                         s->mv_bits+= get_bits_diff(s);
 564                         put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
 565                     }
 566                 } else {
 567                     put_bits(&s->pb, 3, 1); /* motion only */
 568                     if (!s->frame_pred_frame_dct)
 569                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 570                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 571                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 572                     s->qscale -= s->dquant;
 573                     s->mv_bits+= get_bits_diff(s);
 574                 }
 575                 s->f_count++;
 576         } else
 577             {    // RAL: All the following bloc added for B frames:
 578                 if (cbp != 0)
 579                     {    // With coded bloc pattern
 580                     if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
 581                         {    // Bi-directional motion
 582                         if (s->dquant) {
 583                             put_mb_modes(s, 5, 2, 1);
 584                             put_bits(&s->pb, 5, s->qscale);
 585                         } else {
 586                             put_mb_modes(s, 2, 3, 1);
 587                         }
 588                         s->misc_bits += get_bits_diff(s);
 589                         mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 590                         mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 591                         mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 592                         mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 593                         s->b_count++;
 594                         s->f_count++;
 595                         s->mv_bits += get_bits_diff(s);
 596                         put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
 597                         }
 598                     else if (s->mv_dir == MV_DIR_BACKWARD)
 599                         {    // Backward motion
 600                         if (s->dquant) {
 601                             put_mb_modes(s, 6, 2, 1);
 602                             put_bits(&s->pb, 5, s->qscale);
 603                         } else {
 604                             put_mb_modes(s, 3, 3, 1);
 605                         }
 606                         s->misc_bits += get_bits_diff(s);
 607                         mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
 608                         mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
 609                         s->b_count++;
 610                         s->mv_bits += get_bits_diff(s);
 611                         put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
 612                         }
 613                     else if (s->mv_dir == MV_DIR_FORWARD)
 614                         {    // Forward motion
 615                         if (s->dquant) {
 616                             put_mb_modes(s, 6, 3, 1);
 617                             put_bits(&s->pb, 5, s->qscale);
 618                         } else {
 619                             put_mb_modes(s, 4, 3, 1);
 620                         }
 621                         s->misc_bits += get_bits_diff(s);
 622                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
 623                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
 624                         s->f_count++;
 625                         s->mv_bits += get_bits_diff(s);
 626                         put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
 627                         }
 628                     }
 629                 else
 630                     {    // No coded bloc pattern
 631                     if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
 632                         {    // Bi-directional motion
 633                         put_bits(&s->pb, 2, 2); /* backward & forward motion */
 634                         if (!s->frame_pred_frame_dct)
 635                             put_bits(&s->pb, 2, 2); /* motion_type: frame */
 636                         mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 637                         mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 638                         mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 639                         mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 640                         s->b_count++;
 641                         s->f_count++;
 642                         }
 643                     else if (s->mv_dir == MV_DIR_BACKWARD)
 644                         {    // Backward motion
 645                         put_bits(&s->pb, 3, 2); /* backward motion only */
 646                         if (!s->frame_pred_frame_dct)
 647                             put_bits(&s->pb, 2, 2); /* motion_type: frame */
 648                         mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
 649                         mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
 650                         s->b_count++;
 651                         }
 652                     else if (s->mv_dir == MV_DIR_FORWARD)
 653                         {    // Forward motion
 654                         put_bits(&s->pb, 4, 2); /* forward motion only */
 655                         if (!s->frame_pred_frame_dct)
 656                             put_bits(&s->pb, 2, 2); /* motion_type: frame */
 657                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
 658                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
 659                         s->f_count++;
 660                         }
 661                     s->qscale -= s->dquant;
 662                     s->mv_bits += get_bits_diff(s);
 663                     }
 664             // End of bloc from RAL
 665             }
 666         for(i=0;i<6;i++) {
 667             if (cbp & (1 << (5 - i))) {
 668                 mpeg1_encode_block(s, block[i], i);
 669             }
 670         }
 671         s->mb_skip_run = 0;
 672         if(s->mb_intra)
 673             s->i_tex_bits+= get_bits_diff(s);
 674         else
 675             s->p_tex_bits+= get_bits_diff(s);
 676     }
 677
 678     // RAL: By this:
 679     if (s->mv_dir & MV_DIR_FORWARD)
 680         {
 681         s->last_mv[0][0][0]= s->mv[0][0][0];
 682         s->last_mv[0][0][1]= s->mv[0][0][1];
 683         }
 684     if (s->mv_dir & MV_DIR_BACKWARD)
 685         {
 686         s->last_mv[1][0][0]= s->mv[1][0][0];
 687         s->last_mv[1][0][1]= s->mv[1][0][1];
 688         }
 689 }
 690
 691 // RAL: Parameter added: f_or_b_code
 692 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 693 {
 694     int code, bit_size, l, m, bits, range, sign;
 695
 696     if (val == 0) {
 697         /* zero vector */
 698         code = 0;
 699         put_bits(&s->pb,
 700                  mbMotionVectorTable[0][1],
 701                  mbMotionVectorTable[0][0]);
 702     } else {
 703         bit_size = f_or_b_code - 1;
 704         range = 1 << bit_size;
 705         /* modulo encoding */
 706         l = 16 * range;
 707         m = 2 * l;
 708         if (val < -l) {
 709             val += m;
 710         } else if (val >= l) {
 711             val -= m;
 712         }
 713
 714         if (val >= 0) {
 715             val--;
 716             code = (val >> bit_size) + 1;
 717             bits = val & (range - 1);
 718             sign = 0;
 719         } else {
 720             val = -val;
 721             val--;
 722             code = (val >> bit_size) + 1;
 723             bits = val & (range - 1);
 724             sign = 1;
 725         }
 726
 727         assert(code > 0 && code <= 16);
 728
 729         put_bits(&s->pb,
 730                  mbMotionVectorTable[code][1],
 731                  mbMotionVectorTable[code][0]);
 732
 733         put_bits(&s->pb, 1, sign);
 734         if (bit_size > 0) {
 735             put_bits(&s->pb, bit_size, bits);
 736         }
 737     }
 738 }
 739
 740 void ff_mpeg1_encode_init(MpegEncContext *s)
 741 {
 742     static int done=0;
 743
 744     common_init(s);
 745
 746     if(!done){
 747         int f_code;
 748         int mv;
 749         int i;
 750
 751         done=1;
 752         init_rl(&rl_mpeg1);
 753
 754         for(i=0; i<64; i++)
 755         {
 756                 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
 757                 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
 758         }
 759
 760         init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
 761
 762         /* build unified dc encoding tables */
 763         for(i=-255; i<256; i++)
 764         {
 765                 int adiff, index;
 766                 int bits, code;
 767                 int diff=i;
 768
 769                 adiff = ABS(diff);
 770                 if(diff<0) diff--;
 771                 index = vlc_dc_table[adiff];
 772
 773                 bits= vlc_dc_lum_bits[index] + index;
 774                 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 775                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 776
 777                 bits= vlc_dc_chroma_bits[index] + index;
 778                 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 779                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 780         }
 781
 782         mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
 783
 784         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 785             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 786                 int len;
 787
 788                 if(mv==0) len= mbMotionVectorTable[0][1];
 789                 else{
 790                     int val, bit_size, range, code;
 791
 792                     bit_size = s->f_code - 1;
 793                     range = 1 << bit_size;
 794
 795                     val=mv;
 796                     if (val < 0)
 797                         val = -val;
 798                     val--;
 799                     code = (val >> bit_size) + 1;
 800                     if(code<17){
 801                         len= mbMotionVectorTable[code][1] + 1 + bit_size;
 802                     }else{
 803                         len= mbMotionVectorTable[16][1] + 2 + bit_size;
 804                     }
 805                 }
 806
 807                 mv_penalty[f_code][mv+MAX_MV]= len;
 808             }
 809         }
 810
 811
 812         for(f_code=MAX_FCODE; f_code>0; f_code--){
 813             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 814                 fcode_tab[mv+MAX_MV]= f_code;
 815             }
 816         }
 817     }
 818     s->me.mv_penalty= mv_penalty;
 819     s->fcode_tab= fcode_tab;
 820     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 821         s->min_qcoeff=-255;
 822         s->max_qcoeff= 255;
 823     }else{
 824         s->min_qcoeff=-2047;
 825         s->max_qcoeff= 2047;
 826     }
 827     s->intra_ac_vlc_length=
 828     s->inter_ac_vlc_length=
 829     s->intra_ac_vlc_last_length=
 830     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 831 }
 832
 833 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 834 {
 835     if (component == 0) {
 836         put_bits(
 837             &s->pb,
 838             mpeg1_lum_dc_uni[diff+255]&0xFF,
 839             mpeg1_lum_dc_uni[diff+255]>>8);
 840     } else {
 841         put_bits(
 842             &s->pb,
 843             mpeg1_chr_dc_uni[diff+255]&0xFF,
 844             mpeg1_chr_dc_uni[diff+255]>>8);
 845     }
 846 }
 847
 848 static void mpeg1_encode_block(MpegEncContext *s,
 849                                DCTELEM *block,
 850                                int n)
 851 {
 852     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 853     int code, component;
 854 //    RLTable *rl = &rl_mpeg1;
 855
 856     last_index = s->block_last_index[n];
 857
 858     /* DC coef */
 859     if (s->mb_intra) {
 860         component = (n <= 3 ? 0 : n - 4 + 1);
 861         dc = block[0]; /* overflow is impossible */
 862         diff = dc - s->last_dc[component];
 863         encode_dc(s, diff, component);
 864         s->last_dc[component] = dc;
 865         i = 1;
 866 /*
 867         if (s->intra_vlc_format)
 868             rl = &rl_mpeg2;
 869         else
 870             rl = &rl_mpeg1;
 871 */
 872     } else {
 873         /* encode the first coefficient : needs to be done here because
 874            it is handled slightly differently */
 875         level = block[0];
 876         if (abs(level) == 1) {
 877                 code = ((uint32_t)level >> 31); /* the sign bit */
 878                 put_bits(&s->pb, 2, code | 0x02);
 879                 i = 1;
 880         } else {
 881             i = 0;
 882             last_non_zero = -1;
 883             goto next_coef;
 884         }
 885     }
 886
 887     /* now quantify & encode AC coefs */
 888     last_non_zero = i - 1;
 889
 890     for(;i<=last_index;i++) {
 891         j = s->intra_scantable.permutated[i];
 892         level = block[j];
 893     next_coef:
 894 #if 0
 895         if (level != 0)
 896             dprintf("level[%d]=%d\n", i, level);
 897 #endif
 898         /* encode using VLC */
 899         if (level != 0) {
 900             run = i - last_non_zero - 1;
 901
 902             alevel= level;
 903             MASK_ABS(sign, alevel)
 904             sign&=1;
 905
 906 //            code = get_rl_index(rl, 0, run, alevel);
 907             if (alevel <= mpeg1_max_level[0][run]){
 908                 code= mpeg1_index_run[0][run] + alevel - 1;
 909                 /* store the vlc & sign at once */
 910                 put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
 911             } else {
 912                 /* escape seems to be pretty rare <5% so i dont optimize it */
 913                 put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
 914                 /* escape: only clip in this case */
 915                 put_bits(&s->pb, 6, run);
 916                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 917                     if (alevel < 128) {
 918                         put_bits(&s->pb, 8, level & 0xff);
 919                     } else {
 920                         if (level < 0) {
 921                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 922                         } else {
 923                             put_bits(&s->pb, 16, level & 0xffff);
 924                         }
 925                     }
 926                 }else{
 927                     put_bits(&s->pb, 12, level & 0xfff);
 928                 }
 929             }
 930             last_non_zero = i;
 931         }
 932     }
 933     /* end of block */
 934     put_bits(&s->pb, 2, 0x2);
 935 }
 936 #endif //CONFIG_ENCODERS
 937
 938 /******************************************/
 939 /* decoding */
 940
 941 static VLC dc_lum_vlc;
 942 static VLC dc_chroma_vlc;
 943 static VLC mv_vlc;
 944 static VLC mbincr_vlc;
 945 static VLC mb_ptype_vlc;
 946 static VLC mb_btype_vlc;
 947 static VLC mb_pat_vlc;
 948
 949 static void init_vlcs()
 950 {
 951     static int done = 0;
 952
 953     if (!done) {
 954         done = 1;
 955
 956         init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
 957                  vlc_dc_lum_bits, 1, 1,
 958                  vlc_dc_lum_code, 2, 2);
 959         init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
 960                  vlc_dc_chroma_bits, 1, 1,
 961                  vlc_dc_chroma_code, 2, 2);
 962         init_vlc(&mv_vlc, MV_VLC_BITS, 17,
 963                  &mbMotionVectorTable[0][1], 2, 1,
 964                  &mbMotionVectorTable[0][0], 2, 1);
 965         init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
 966                  &mbAddrIncrTable[0][1], 2, 1,
 967                  &mbAddrIncrTable[0][0], 2, 1);
 968         init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 63,
 969                  &mbPatTable[0][1], 2, 1,
 970                  &mbPatTable[0][0], 2, 1);
 971
 972         init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
 973                  &table_mb_ptype[0][1], 2, 1,
 974                  &table_mb_ptype[0][0], 2, 1);
 975         init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
 976                  &table_mb_btype[0][1], 2, 1,
 977                  &table_mb_btype[0][0], 2, 1);
 978         init_rl(&rl_mpeg1);
 979         init_rl(&rl_mpeg2);
 980
 981         init_2d_vlc_rl(&rl_mpeg1);
 982         init_2d_vlc_rl(&rl_mpeg2);
 983     }
 984 }
 985
 986 static inline int get_dmv(MpegEncContext *s)
 987 {
 988     if(get_bits1(&s->gb))
 989         return 1 - (get_bits1(&s->gb) << 1);
 990     else
 991         return 0;
 992 }
 993
 994 static inline int get_qscale(MpegEncContext *s)
 995 {
 996     int qscale = get_bits(&s->gb, 5);
 997     if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
 998         if (s->q_scale_type) {
 999             return non_linear_qscale[qscale];
1000         } else {
1001             return qscale << 1;
1002         }
1003     }
1004     return qscale;
1005 }
1006
1007 /* motion type (for mpeg2) */
1008 #define MT_FIELD 1
1009 #define MT_FRAME 2
1010 #define MT_16X8  2
1011 #define MT_DMV   3
1012
1013 static int mpeg_decode_mb(MpegEncContext *s,
1014                           DCTELEM block[6][64])
1015 {
1016     int i, j, k, cbp, val, mb_type, motion_type;
1017
1018     dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1019
1020     assert(s->mb_skiped==0);
1021
1022     if (s->mb_skip_run-- != 0) {
1023         if(s->pict_type == I_TYPE){
1024             av_log(s->avctx, AV_LOG_ERROR, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1025             return -1;
1026         }
1027
1028         /* skip mb */
1029         s->mb_intra = 0;
1030         for(i=0;i<6;i++)
1031             s->block_last_index[i] = -1;
1032         s->mv_type = MV_TYPE_16X16;
1033         if (s->pict_type == P_TYPE) {
1034             /* if P type, zero motion vector is implied */
1035             s->mv_dir = MV_DIR_FORWARD;
1036             s->mv[0][0][0] = s->mv[0][0][1] = 0;
1037             s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1038             s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1039             s->mb_skiped = 1;
1040             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1041         } else {
1042             /* if B type, reuse previous vectors and directions */
1043             s->mv[0][0][0] = s->last_mv[0][0][0];
1044             s->mv[0][0][1] = s->last_mv[0][0][1];
1045             s->mv[1][0][0] = s->last_mv[1][0][0];
1046             s->mv[1][0][1] = s->last_mv[1][0][1];
1047
1048             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1049                 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
1050 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1051
1052             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1053                 s->mb_skiped = 1;
1054         }
1055
1056         return 0;
1057     }
1058
1059     switch(s->pict_type) {
1060     default:
1061     case I_TYPE:
1062         if (get_bits1(&s->gb) == 0) {
1063             if (get_bits1(&s->gb) == 0){
1064                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1065                 return -1;
1066             }
1067             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1068         } else {
1069             mb_type = MB_TYPE_INTRA;
1070         }
1071         break;
1072     case P_TYPE:
1073         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1074         if (mb_type < 0){
1075             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1076             return -1;
1077         }
1078         mb_type = ptype2mb_type[ mb_type ];
1079         break;
1080     case B_TYPE:
1081         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1082         if (mb_type < 0){
1083             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1084             return -1;
1085         }
1086         mb_type = btype2mb_type[ mb_type ];
1087         break;
1088     }
1089     dprintf("mb_type=%x\n", mb_type);
1090 //    motion_type = 0; /* avoid warning */
1091     if (IS_INTRA(mb_type)) {
1092         /* compute dct type */
1093         if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1094             !s->frame_pred_frame_dct) {
1095             s->interlaced_dct = get_bits1(&s->gb);
1096         }
1097
1098         if (IS_QUANT(mb_type))
1099             s->qscale = get_qscale(s);
1100
1101         if (s->concealment_motion_vectors) {
1102             /* just parse them */
1103             if (s->picture_structure != PICT_FRAME)
1104                 skip_bits1(&s->gb); /* field select */
1105
1106             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1107                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1108             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1109                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1110
1111             skip_bits1(&s->gb); /* marker */
1112         }else
1113             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1114         s->mb_intra = 1;
1115 #ifdef HAVE_XVMC
1116         //one 1 we memcpy blocks in xvmcvideo
1117         if(s->avctx->xvmc_acceleration > 1){
1118             XVMC_pack_pblocks(s,-1);//inter are always full blocks
1119             if(s->swap_uv){
1120                 exchange_uv(s);
1121             }
1122         }
1123 #endif
1124
1125         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1126             for(i=0;i<6;i++) {
1127                 if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1128                     return -1;
1129             }
1130         } else {
1131             for(i=0;i<6;i++) {
1132                 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1133                     return -1;
1134             }
1135         }
1136     } else {
1137         if (mb_type & MB_TYPE_ZERO_MV){
1138             assert(mb_type & MB_TYPE_CBP);
1139
1140             /* compute dct type */
1141             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1142                 !s->frame_pred_frame_dct) {
1143                 s->interlaced_dct = get_bits1(&s->gb);
1144             }
1145
1146             if (IS_QUANT(mb_type))
1147                 s->qscale = get_qscale(s);
1148
1149             s->mv_dir = MV_DIR_FORWARD;
1150             s->mv_type = MV_TYPE_16X16;
1151             s->last_mv[0][0][0] = 0;
1152             s->last_mv[0][0][1] = 0;
1153             s->last_mv[0][1][0] = 0;
1154             s->last_mv[0][1][1] = 0;
1155             s->mv[0][0][0] = 0;
1156             s->mv[0][0][1] = 0;
1157         }else{
1158             assert(mb_type & MB_TYPE_L0L1);
1159 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1160             /* get additionnal motion vector type */
1161             if (s->frame_pred_frame_dct)
1162                 motion_type = MT_FRAME;
1163             else{
1164                 motion_type = get_bits(&s->gb, 2);
1165             }
1166
1167             /* compute dct type */
1168             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1169                 !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1170                 s->interlaced_dct = get_bits1(&s->gb);
1171             }
1172
1173             if (IS_QUANT(mb_type))
1174                 s->qscale = get_qscale(s);
1175
1176             /* motion vectors */
1177             s->mv_dir = 0;
1178             for(i=0;i<2;i++) {
1179                 if (USES_LIST(mb_type, i)) {
1180                     s->mv_dir |= (MV_DIR_FORWARD >> i);
1181                     dprintf("motion_type=%d\n", motion_type);
1182                     switch(motion_type) {
1183                     case MT_FRAME: /* or MT_16X8 */
1184                         if (s->picture_structure == PICT_FRAME) {
1185                             /* MT_FRAME */
1186                             mb_type |= MB_TYPE_16x16;
1187                             s->mv_type = MV_TYPE_16X16;
1188                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1189                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1190                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1191                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1192                             /* full_pel: only for mpeg1 */
1193                             if (s->full_pel[i]){
1194                                 s->mv[i][0][0] <<= 1;
1195                                 s->mv[i][0][1] <<= 1;
1196                             }
1197                         } else {
1198                             /* MT_16X8 */
1199                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1200                             s->mv_type = MV_TYPE_16X8;
1201                             for(j=0;j<2;j++) {
1202                                 s->field_select[i][j] = get_bits1(&s->gb);
1203                                 for(k=0;k<2;k++) {
1204                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1205                                                              s->last_mv[i][j][k]);
1206                                     s->last_mv[i][j][k] = val;
1207                                     s->mv[i][j][k] = val;
1208                                 }
1209                             }
1210                         }
1211                         break;
1212                     case MT_FIELD:
1213                         s->mv_type = MV_TYPE_FIELD;
1214                         if (s->picture_structure == PICT_FRAME) {
1215                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1216                             for(j=0;j<2;j++) {
1217                                 s->field_select[i][j] = get_bits1(&s->gb);
1218                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1219                                                          s->last_mv[i][j][0]);
1220                                 s->last_mv[i][j][0] = val;
1221                                 s->mv[i][j][0] = val;
1222                                 dprintf("fmx=%d\n", val);
1223                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1224                                                          s->last_mv[i][j][1] >> 1);
1225                                 s->last_mv[i][j][1] = val << 1;
1226                                 s->mv[i][j][1] = val;
1227                                 dprintf("fmy=%d\n", val);
1228                             }
1229                         } else {
1230                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1231                             s->field_select[i][0] = get_bits1(&s->gb);
1232                             for(k=0;k<2;k++) {
1233                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1234                                                          s->last_mv[i][0][k]);
1235                                 s->last_mv[i][0][k] = val;
1236                                 s->last_mv[i][1][k] = val;
1237                                 s->mv[i][0][k] = val;
1238                             }
1239                         }
1240                         break;
1241                     case MT_DMV:
1242                         {
1243                             int dmx, dmy, mx, my, m;
1244
1245                             mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1246                                                     s->last_mv[i][0][0]);
1247                             s->last_mv[i][0][0] = mx;
1248                             s->last_mv[i][1][0] = mx;
1249                             dmx = get_dmv(s);
1250                             my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1251                                                     s->last_mv[i][0][1] >> 1);
1252                             dmy = get_dmv(s);
1253                             s->mv_type = MV_TYPE_DMV;
1254
1255
1256                             s->last_mv[i][0][1] = my<<1;
1257                             s->last_mv[i][1][1] = my<<1;
1258
1259                             s->mv[i][0][0] = mx;
1260                             s->mv[i][0][1] = my;
1261                             s->mv[i][1][0] = mx;//not used
1262                             s->mv[i][1][1] = my;//not used
1263
1264                             if (s->picture_structure == PICT_FRAME) {
1265                                 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1266
1267                                 //m = 1 + 2 * s->top_field_first;
1268                                 m = s->top_field_first ? 1 : 3;
1269
1270                                 /* top -> top pred */
1271                                 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1272                                 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1273                                 m = 4 - m;
1274                                 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1275                                 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1276                             } else {
1277                                 mb_type |= MB_TYPE_16x16;
1278
1279                                 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1280                                 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1281                                 if(s->picture_structure == PICT_TOP_FIELD)
1282                                     s->mv[i][2][1]--;
1283                                 else
1284                                     s->mv[i][2][1]++;
1285                             }
1286                         }
1287                         break;
1288                     default:
1289                         av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1290                         return -1;
1291                     }
1292                 }
1293             }
1294         }
1295
1296         s->mb_intra = 0;
1297
1298         if (HAS_CBP(mb_type)) {
1299             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1300             if (cbp < 0){
1301                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1302                 return -1;
1303             }
1304             cbp++;
1305
1306 #ifdef HAVE_XVMC
1307             //on 1 we memcpy blocks in xvmcvideo
1308             if(s->avctx->xvmc_acceleration > 1){
1309                 XVMC_pack_pblocks(s,cbp);
1310                 if(s->swap_uv){
1311                     exchange_uv(s);
1312                 }
1313             }
1314 #endif
1315
1316             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1317                 for(i=0;i<6;i++) {
1318                     if (cbp & 32) {
1319                         if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1320                             return -1;
1321                     } else {
1322                         s->block_last_index[i] = -1;
1323                     }
1324                     cbp+=cbp;
1325                 }
1326             } else {
1327                 for(i=0;i<6;i++) {
1328                     if (cbp & 32) {
1329                         if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1330                             return -1;
1331                     } else {
1332                         s->block_last_index[i] = -1;
1333                     }
1334                     cbp+=cbp;
1335                 }
1336             }
1337         }else{
1338             for(i=0;i<6;i++)
1339                 s->block_last_index[i] = -1;
1340         }
1341     }
1342
1343     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1344
1345     return 0;
1346 }
1347
1348 /* as h263, but only 17 codes */
1349 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1350 {
1351     int code, sign, val, l, shift;
1352
1353     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1354     if (code == 0) {
1355         return pred;
1356     }
1357     if (code < 0) {
1358         return 0xffff;
1359     }
1360
1361     sign = get_bits1(&s->gb);
1362     shift = fcode - 1;
1363     val = code;
1364     if (shift) {
1365         val = (val - 1) << shift;
1366         val |= get_bits(&s->gb, shift);
1367         val++;
1368     }
1369     if (sign)
1370         val = -val;
1371     val += pred;
1372
1373     /* modulo decoding */
1374     l = 1 << (shift+4);
1375     val = ((val + l)&(l*2-1)) - l;
1376     return val;
1377 }
1378
1379 static inline int decode_dc(GetBitContext *gb, int component)
1380 {
1381     int code, diff;
1382
1383     if (component == 0) {
1384         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1385     } else {
1386         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1387     }
1388     if (code < 0){
1389         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1390         return 0xffff;
1391     }
1392     if (code == 0) {
1393         diff = 0;
1394     } else {
1395         diff = get_xbits(gb, code);
1396     }
1397     return diff;
1398 }
1399
1400 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1401                                DCTELEM *block,
1402                                int n)
1403 {
1404     int level, dc, diff, i, j, run;
1405     int component;
1406     RLTable *rl = &rl_mpeg1;
1407     uint8_t * const scantable= s->intra_scantable.permutated;
1408     const uint16_t *quant_matrix= s->intra_matrix;
1409     const int qscale= s->qscale;
1410
1411     /* DC coef */
1412     component = (n <= 3 ? 0 : n - 4 + 1);
1413     diff = decode_dc(&s->gb, component);
1414     if (diff >= 0xffff)
1415         return -1;
1416     dc = s->last_dc[component];
1417     dc += diff;
1418     s->last_dc[component] = dc;
1419     block[0] = dc<<3;
1420     dprintf("dc=%d diff=%d\n", dc, diff);
1421     i = 0;
1422     {
1423         OPEN_READER(re, &s->gb);
1424         /* now quantify & encode AC coefs */
1425         for(;;) {
1426             UPDATE_CACHE(re, &s->gb);
1427             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1428
1429             if(level == 127){
1430                 break;
1431             } else if(level != 0) {
1432                 i += run;
1433                 j = scantable[i];
1434                 level= (level*qscale*quant_matrix[j])>>3;
1435                 level= (level-1)|1;
1436                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1437                 LAST_SKIP_BITS(re, &s->gb, 1);
1438             } else {
1439                 /* escape */
1440                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1441                 UPDATE_CACHE(re, &s->gb);
1442                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1443                 if (level == -128) {
1444                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1445                 } else if (level == 0) {
1446                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1447                 }
1448                 i += run;
1449                 j = scantable[i];
1450                 if(level<0){
1451                     level= -level;
1452                     level= (level*qscale*quant_matrix[j])>>3;
1453                     level= (level-1)|1;
1454                     level= -level;
1455                 }else{
1456                     level= (level*qscale*quant_matrix[j])>>3;
1457                     level= (level-1)|1;
1458                 }
1459             }
1460             if (i > 63){
1461                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1462                 return -1;
1463             }
1464
1465             block[j] = level;
1466         }
1467         CLOSE_READER(re, &s->gb);
1468     }
1469     s->block_last_index[n] = i;
1470    return 0;
1471 }
1472
1473 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1474                                DCTELEM *block,
1475                                int n)
1476 {
1477     int level, i, j, run;
1478     RLTable *rl = &rl_mpeg1;
1479     uint8_t * const scantable= s->intra_scantable.permutated;
1480     const uint16_t *quant_matrix= s->inter_matrix;
1481     const int qscale= s->qscale;
1482
1483     {
1484         int v;
1485         OPEN_READER(re, &s->gb);
1486         i = -1;
1487         /* special case for the first coef. no need to add a second vlc table */
1488         UPDATE_CACHE(re, &s->gb);
1489         v= SHOW_UBITS(re, &s->gb, 2);
1490         if (v & 2) {
1491             LAST_SKIP_BITS(re, &s->gb, 2);
1492             level= (3*qscale*quant_matrix[0])>>4;
1493             level= (level-1)|1;
1494             if(v&1)
1495                 level= -level;
1496             block[0] = level;
1497             i++;
1498         }
1499
1500         /* now quantify & encode AC coefs */
1501         for(;;) {
1502             UPDATE_CACHE(re, &s->gb);
1503             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1504
1505             if(level == 127){
1506                 break;
1507             } else if(level != 0) {
1508                 i += run;
1509                 j = scantable[i];
1510                 level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1511                 level= (level-1)|1;
1512                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1513                 LAST_SKIP_BITS(re, &s->gb, 1);
1514             } else {
1515                 /* escape */
1516                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1517                 UPDATE_CACHE(re, &s->gb);
1518                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1519                 if (level == -128) {
1520                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1521                 } else if (level == 0) {
1522                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1523                 }
1524                 i += run;
1525                 j = scantable[i];
1526                 if(level<0){
1527                     level= -level;
1528                     level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1529                     level= (level-1)|1;
1530                     level= -level;
1531                 }else{
1532                     level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1533                     level= (level-1)|1;
1534                 }
1535             }
1536             if (i > 63){
1537                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1538                 return -1;
1539             }
1540
1541             block[j] = level;
1542         }
1543         CLOSE_READER(re, &s->gb);
1544     }
1545     s->block_last_index[n] = i;
1546     return 0;
1547 }
1548
1549 /* Also does unquantization here, since I will never support mpeg2
1550    encoding */
1551 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1552                                DCTELEM *block,
1553                                int n)
1554 {
1555     int level, i, j, run;
1556     RLTable *rl = &rl_mpeg1;
1557     uint8_t * const scantable= s->intra_scantable.permutated;
1558     const uint16_t *quant_matrix;
1559     const int qscale= s->qscale;
1560     int mismatch;
1561
1562     mismatch = 1;
1563
1564     {
1565         int v;
1566         OPEN_READER(re, &s->gb);
1567         i = -1;
1568         if (n < 4)
1569             quant_matrix = s->inter_matrix;
1570         else
1571             quant_matrix = s->chroma_inter_matrix;
1572
1573         /* special case for the first coef. no need to add a second vlc table */
1574         UPDATE_CACHE(re, &s->gb);
1575         v= SHOW_UBITS(re, &s->gb, 2);
1576         if (v & 2) {
1577             LAST_SKIP_BITS(re, &s->gb, 2);
1578             level= (3*qscale*quant_matrix[0])>>5;
1579             if(v&1)
1580                 level= -level;
1581             block[0] = level;
1582             mismatch ^= level;
1583             i++;
1584         }
1585
1586         /* now quantify & encode AC coefs */
1587         for(;;) {
1588             UPDATE_CACHE(re, &s->gb);
1589             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1590
1591             if(level == 127){
1592                 break;
1593             } else if(level != 0) {
1594                 i += run;
1595                 j = scantable[i];
1596                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1597                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1598                 LAST_SKIP_BITS(re, &s->gb, 1);
1599             } else {
1600                 /* escape */
1601                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1602                 UPDATE_CACHE(re, &s->gb);
1603                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1604
1605                 i += run;
1606                 j = scantable[i];
1607                 if(level<0){
1608                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1609                     level= -level;
1610                 }else{
1611                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1612                 }
1613             }
1614             if (i > 63){
1615                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1616                 return -1;
1617             }
1618
1619             mismatch ^= level;
1620             block[j] = level;
1621         }
1622         CLOSE_READER(re, &s->gb);
1623     }
1624     block[63] ^= (mismatch & 1);
1625
1626     s->block_last_index[n] = i;
1627     return 0;
1628 }
1629
1630 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1631                                DCTELEM *block,
1632                                int n)
1633 {
1634     int level, dc, diff, i, j, run;
1635     int component;
1636     RLTable *rl;
1637     uint8_t * const scantable= s->intra_scantable.permutated;
1638     const uint16_t *quant_matrix;
1639     const int qscale= s->qscale;
1640     int mismatch;
1641
1642     /* DC coef */
1643     if (n < 4){
1644         quant_matrix = s->intra_matrix;
1645         component = 0;
1646     }else{
1647         quant_matrix = s->chroma_intra_matrix;
1648         component = n - 3;
1649     }
1650     diff = decode_dc(&s->gb, component);
1651     if (diff >= 0xffff)
1652         return -1;
1653     dc = s->last_dc[component];
1654     dc += diff;
1655     s->last_dc[component] = dc;
1656     block[0] = dc << (3 - s->intra_dc_precision);
1657     dprintf("dc=%d\n", block[0]);
1658     mismatch = block[0] ^ 1;
1659     i = 0;
1660     if (s->intra_vlc_format)
1661         rl = &rl_mpeg2;
1662     else
1663         rl = &rl_mpeg1;
1664
1665     {
1666         OPEN_READER(re, &s->gb);
1667         /* now quantify & encode AC coefs */
1668         for(;;) {
1669             UPDATE_CACHE(re, &s->gb);
1670             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1671
1672             if(level == 127){
1673                 break;
1674             } else if(level != 0) {
1675                 i += run;
1676                 j = scantable[i];
1677                 level= (level*qscale*quant_matrix[j])>>4;
1678                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1679                 LAST_SKIP_BITS(re, &s->gb, 1);
1680             } else {
1681                 /* escape */
1682                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1683                 UPDATE_CACHE(re, &s->gb);
1684                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1685                 i += run;
1686                 j = scantable[i];
1687                 if(level<0){
1688                     level= (-level*qscale*quant_matrix[j])>>4;
1689                     level= -level;
1690                 }else{
1691                     level= (level*qscale*quant_matrix[j])>>4;
1692                 }
1693             }
1694             if (i > 63){
1695                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1696                 return -1;
1697             }
1698
1699             mismatch^= level;
1700             block[j] = level;
1701         }
1702         CLOSE_READER(re, &s->gb);
1703     }
1704     block[63]^= mismatch&1;
1705
1706     s->block_last_index[n] = i;
1707     return 0;
1708 }
1709
1710 typedef struct Mpeg1Context {
1711     MpegEncContext mpeg_enc_ctx;
1712     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1713     int repeat_field; /* true if we must repeat the field */
1714     AVPanScan pan_scan; /** some temporary storage for the panscan */
1715 } Mpeg1Context;
1716
1717 static int mpeg_decode_init(AVCodecContext *avctx)
1718 {
1719     Mpeg1Context *s = avctx->priv_data;
1720
1721     s->mpeg_enc_ctx.flags= avctx->flags;
1722     common_init(&s->mpeg_enc_ctx);
1723     init_vlcs();
1724
1725     s->mpeg_enc_ctx_allocated = 0;
1726     s->mpeg_enc_ctx.picture_number = 0;
1727     s->repeat_field = 0;
1728     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1729     return 0;
1730 }
1731
1732 /* return the 8 bit start code value and update the search
1733    state. Return -1 if no start code found */
1734 static int find_start_code(uint8_t **pbuf_ptr, uint8_t *buf_end)
1735 {
1736     uint8_t *buf_ptr;
1737     unsigned int state=0xFFFFFFFF, v;
1738     int val;
1739
1740     buf_ptr = *pbuf_ptr;
1741     while (buf_ptr < buf_end) {
1742         v = *buf_ptr++;
1743         if (state == 0x000001) {
1744             state = ((state << 8) | v) & 0xffffff;
1745             val = state;
1746             goto found;
1747         }
1748         state = ((state << 8) | v) & 0xffffff;
1749     }
1750     val = -1;
1751  found:
1752     *pbuf_ptr = buf_ptr;
1753     return val;
1754 }
1755
1756 static int mpeg1_decode_picture(AVCodecContext *avctx,
1757                                 uint8_t *buf, int buf_size)
1758 {
1759     Mpeg1Context *s1 = avctx->priv_data;
1760     MpegEncContext *s = &s1->mpeg_enc_ctx;
1761     int ref, f_code;
1762
1763     init_get_bits(&s->gb, buf, buf_size*8);
1764
1765     ref = get_bits(&s->gb, 10); /* temporal ref */
1766     s->pict_type = get_bits(&s->gb, 3);
1767     dprintf("pict_type=%d number=%d\n", s->pict_type, s->picture_number);
1768
1769     skip_bits(&s->gb, 16);
1770     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1771         s->full_pel[0] = get_bits1(&s->gb);
1772         f_code = get_bits(&s->gb, 3);
1773         if (f_code == 0)
1774             return -1;
1775         s->mpeg_f_code[0][0] = f_code;
1776         s->mpeg_f_code[0][1] = f_code;
1777     }
1778     if (s->pict_type == B_TYPE) {
1779         s->full_pel[1] = get_bits1(&s->gb);
1780         f_code = get_bits(&s->gb, 3);
1781         if (f_code == 0)
1782             return -1;
1783         s->mpeg_f_code[1][0] = f_code;
1784         s->mpeg_f_code[1][1] = f_code;
1785     }
1786     s->current_picture.pict_type= s->pict_type;
1787     s->current_picture.key_frame= s->pict_type == I_TYPE;
1788
1789     s->y_dc_scale = 8;
1790     s->c_dc_scale = 8;
1791     s->first_slice = 1;
1792     return 0;
1793 }
1794
1795 static void mpeg_decode_sequence_extension(MpegEncContext *s)
1796 {
1797     int horiz_size_ext, vert_size_ext;
1798     int bit_rate_ext, vbv_buf_ext;
1799     int frame_rate_ext_n, frame_rate_ext_d;
1800     int level, profile;
1801
1802     skip_bits(&s->gb, 1); /* profil and level esc*/
1803     profile= get_bits(&s->gb, 3);
1804     level= get_bits(&s->gb, 4);
1805     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1806     skip_bits(&s->gb, 2); /* chroma_format */
1807     horiz_size_ext = get_bits(&s->gb, 2);
1808     vert_size_ext = get_bits(&s->gb, 2);
1809     s->width |= (horiz_size_ext << 12);
1810     s->height |= (vert_size_ext << 12);
1811     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1812     s->bit_rate = ((s->bit_rate / 400) | (bit_rate_ext << 12)) * 400;
1813     skip_bits1(&s->gb); /* marker */
1814     vbv_buf_ext = get_bits(&s->gb, 8);
1815
1816     s->low_delay = get_bits1(&s->gb);
1817     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1818
1819     frame_rate_ext_n = get_bits(&s->gb, 2);
1820     frame_rate_ext_d = get_bits(&s->gb, 5);
1821     av_reduce(
1822         &s->avctx->frame_rate,
1823         &s->avctx->frame_rate_base,
1824         frame_rate_tab[s->frame_rate_index] * (frame_rate_ext_n+1),
1825         MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d+1),
1826         1<<30);
1827
1828     dprintf("sequence extension\n");
1829     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1830     s->avctx->sub_id = 2; /* indicates mpeg2 found */
1831
1832     if(s->aspect_ratio_info <= 1)
1833         s->avctx->sample_aspect_ratio= mpeg2_aspect[s->aspect_ratio_info];
1834     else{
1835         s->avctx->sample_aspect_ratio=
1836             av_div_q(
1837                 mpeg2_aspect[s->aspect_ratio_info],
1838                 (AVRational){s->width, s->height}
1839             );
1840     }
1841
1842     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1843         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d \n", profile, level);
1844 }
1845
1846 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1847 {
1848     MpegEncContext *s= &s1->mpeg_enc_ctx;
1849     int color_description, w, h;
1850
1851     skip_bits(&s->gb, 3); /* video format */
1852     color_description= get_bits1(&s->gb);
1853     if(color_description){
1854         skip_bits(&s->gb, 8); /* color primaries */
1855         skip_bits(&s->gb, 8); /* transfer_characteristics */
1856         skip_bits(&s->gb, 8); /* matrix_coefficients */
1857     }
1858     w= get_bits(&s->gb, 14);
1859     skip_bits(&s->gb, 1); //marker
1860     h= get_bits(&s->gb, 14);
1861     skip_bits(&s->gb, 1); //marker
1862
1863     s1->pan_scan.width= 16*w;
1864     s1->pan_scan.height=16*h;
1865
1866     if(s->aspect_ratio_info > 1)
1867         s->avctx->sample_aspect_ratio=
1868             av_div_q(
1869                 mpeg2_aspect[s->aspect_ratio_info],
1870                 (AVRational){w, h}
1871             );
1872
1873     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1874         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1875 }
1876
1877 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1878 {
1879     MpegEncContext *s= &s1->mpeg_enc_ctx;
1880     int i;
1881
1882     for(i=0; i<1; i++){ //FIXME count
1883         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1884         skip_bits(&s->gb, 1); //marker
1885         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1886         skip_bits(&s->gb, 1); //marker
1887     }
1888
1889     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1890         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1891             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1892             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1893             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1894         );
1895 }
1896
1897 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1898 {
1899     int i, v, j;
1900
1901     dprintf("matrix extension\n");
1902
1903     if (get_bits1(&s->gb)) {
1904         for(i=0;i<64;i++) {
1905             v = get_bits(&s->gb, 8);
1906             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1907             s->intra_matrix[j] = v;
1908             s->chroma_intra_matrix[j] = v;
1909         }
1910     }
1911     if (get_bits1(&s->gb)) {
1912         for(i=0;i<64;i++) {
1913             v = get_bits(&s->gb, 8);
1914             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1915             s->inter_matrix[j] = v;
1916             s->chroma_inter_matrix[j] = v;
1917         }
1918     }
1919     if (get_bits1(&s->gb)) {
1920         for(i=0;i<64;i++) {
1921             v = get_bits(&s->gb, 8);
1922             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1923             s->chroma_intra_matrix[j] = v;
1924         }
1925     }
1926     if (get_bits1(&s->gb)) {
1927         for(i=0;i<64;i++) {
1928             v = get_bits(&s->gb, 8);
1929             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1930             s->chroma_inter_matrix[j] = v;
1931         }
1932     }
1933 }
1934
1935 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1936 {
1937     s->full_pel[0] = s->full_pel[1] = 0;
1938     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1939     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1940     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1941     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1942     s->intra_dc_precision = get_bits(&s->gb, 2);
1943     s->picture_structure = get_bits(&s->gb, 2);
1944     s->top_field_first = get_bits1(&s->gb);
1945     s->frame_pred_frame_dct = get_bits1(&s->gb);
1946     s->concealment_motion_vectors = get_bits1(&s->gb);
1947     s->q_scale_type = get_bits1(&s->gb);
1948     s->intra_vlc_format = get_bits1(&s->gb);
1949     s->alternate_scan = get_bits1(&s->gb);
1950     s->repeat_first_field = get_bits1(&s->gb);
1951     s->chroma_420_type = get_bits1(&s->gb);
1952     s->progressive_frame = get_bits1(&s->gb);
1953
1954     if(s->picture_structure == PICT_FRAME)
1955         s->first_field=0;
1956     else{
1957         s->first_field ^= 1;
1958         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1959     }
1960
1961     if(s->alternate_scan){
1962         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1963         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1964         ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
1965         ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1966     }else{
1967         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1968         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1969         ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
1970         ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
1971     }
1972
1973     /* composite display not parsed */
1974     dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
1975     dprintf("picture_structure=%d\n", s->picture_structure);
1976     dprintf("top field first=%d\n", s->top_field_first);
1977     dprintf("repeat first field=%d\n", s->repeat_first_field);
1978     dprintf("conceal=%d\n", s->concealment_motion_vectors);
1979     dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
1980     dprintf("alternate_scan=%d\n", s->alternate_scan);
1981     dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1982     dprintf("progressive_frame=%d\n", s->progressive_frame);
1983 }
1984
1985 static void mpeg_decode_extension(AVCodecContext *avctx,
1986                                   uint8_t *buf, int buf_size)
1987 {
1988     Mpeg1Context *s1 = avctx->priv_data;
1989     MpegEncContext *s = &s1->mpeg_enc_ctx;
1990     int ext_type;
1991
1992     init_get_bits(&s->gb, buf, buf_size*8);
1993
1994     ext_type = get_bits(&s->gb, 4);
1995     switch(ext_type) {
1996     case 0x1:
1997         mpeg_decode_sequence_extension(s);
1998         break;
1999     case 0x2:
2000         mpeg_decode_sequence_display_extension(s1);
2001         break;
2002     case 0x3:
2003         mpeg_decode_quant_matrix_extension(s);
2004         break;
2005     case 0x7:
2006         mpeg_decode_picture_display_extension(s1);
2007         break;
2008     case 0x8:
2009         mpeg_decode_picture_coding_extension(s);
2010         break;
2011     }
2012 }
2013
2014 static void exchange_uv(MpegEncContext *s){
2015 short * tmp;
2016
2017     tmp = s->pblocks[4];
2018     s->pblocks[4] = s->pblocks[5];
2019     s->pblocks[5] = tmp;
2020 }
2021
2022 #define DECODE_SLICE_FATAL_ERROR -2
2023 #define DECODE_SLICE_ERROR -1
2024 #define DECODE_SLICE_OK 0
2025
2026 /**
2027  * decodes a slice.
2028  * @return DECODE_SLICE_FATAL_ERROR if a non recoverable error occured<br>
2029  *         DECODE_SLICE_ERROR if the slice is damaged<br>
2030  *         DECODE_SLICE_OK if this slice is ok<br>
2031  */
2032 static int mpeg_decode_slice(AVCodecContext *avctx,
2033                               AVFrame *pict,
2034                               int start_code,
2035                               uint8_t **buf, int buf_size)
2036 {
2037     Mpeg1Context *s1 = avctx->priv_data;
2038     MpegEncContext *s = &s1->mpeg_enc_ctx;
2039     int ret;
2040     const int field_pic= s->picture_structure != PICT_FRAME;
2041
2042     s->resync_mb_x= s->mb_x =
2043     s->resync_mb_y= s->mb_y = -1;
2044
2045     start_code = (start_code - 1) & 0xff;
2046     if (start_code >= s->mb_height){
2047         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", start_code, s->mb_height);
2048         return -1;
2049     }
2050
2051     ff_mpeg1_clean_buffers(s);
2052     s->interlaced_dct = 0;
2053
2054     /* start frame decoding */
2055     if (s->first_slice) {
2056       if(s->first_field || s->picture_structure==PICT_FRAME){
2057         if(MPV_frame_start(s, avctx) < 0)
2058             return DECODE_SLICE_FATAL_ERROR;
2059
2060         ff_er_frame_start(s);
2061
2062         /* first check if we must repeat the frame */
2063         s->current_picture_ptr->repeat_pict = 0;
2064         if (s->repeat_first_field) {
2065             if (s->progressive_sequence) {
2066                 if (s->top_field_first)
2067                     s->current_picture_ptr->repeat_pict = 4;
2068                 else
2069                     s->current_picture_ptr->repeat_pict = 2;
2070             } else if (s->progressive_frame) {
2071                 s->current_picture_ptr->repeat_pict = 1;
2072             }
2073         }
2074
2075         *s->current_picture_ptr->pan_scan= s1->pan_scan;
2076       }else{ //second field
2077             int i;
2078
2079             if(!s->current_picture_ptr){
2080                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2081                 return -1;
2082             }
2083
2084             for(i=0; i<4; i++){
2085                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
2086                 if(s->picture_structure == PICT_BOTTOM_FIELD){
2087                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2088                 }
2089             }
2090       }
2091 #ifdef HAVE_XVMC
2092 // MPV_frame_start will call this function too,
2093 // but we need to call it on every field
2094       if(s->avctx->xvmc_acceleration)
2095          XVMC_field_start(s,avctx);
2096 #endif
2097     }//fi(s->first_slice)
2098
2099     init_get_bits(&s->gb, *buf, buf_size*8);
2100
2101     s->qscale = get_qscale(s);
2102     if (s->first_slice && (s->first_field || s->picture_structure==PICT_FRAME)) {
2103         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2104              av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
2105                  s->qscale, s->mpeg_f_code[0][0],s->mpeg_f_code[0][1],s->mpeg_f_code[1][0],s->mpeg_f_code[1][1],
2106                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
2107                  s->progressive_sequence ? "pro" :"", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
2108                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2109                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2110         }
2111     }
2112
2113     s->first_slice = 0;
2114     if(s->qscale == 0){
2115         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2116         return -1;
2117     }
2118
2119     /* extra slice info */
2120     while (get_bits1(&s->gb) != 0) {
2121         skip_bits(&s->gb, 8);
2122     }
2123
2124     s->mb_x=0;
2125
2126     for(;;) {
2127         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2128         if (code < 0){
2129             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2130             return -1;
2131         }
2132         if (code >= 33) {
2133             if (code == 33) {
2134                 s->mb_x += 33;
2135             }
2136             /* otherwise, stuffing, nothing to do */
2137         } else {
2138             s->mb_x += code;
2139             break;
2140         }
2141     }
2142
2143     s->resync_mb_x= s->mb_x;
2144     s->resync_mb_y= s->mb_y = start_code;
2145     s->mb_skip_run= 0;
2146     ff_init_block_index(s);
2147
2148     for(;;) {
2149 #ifdef HAVE_XVMC
2150         //one 1 we memcpy blocks in xvmcvideo
2151         if(s->avctx->xvmc_acceleration > 1)
2152             XVMC_init_block(s);//set s->block
2153 #endif
2154
2155         s->dsp.clear_blocks(s->block[0]);
2156
2157         ret = mpeg_decode_mb(s, s->block);
2158         s->chroma_qscale= s->qscale;
2159
2160         dprintf("ret=%d\n", ret);
2161         if (ret < 0)
2162             return -1;
2163
2164         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2165             const int wrap = field_pic ? 2*s->block_wrap[0] : s->block_wrap[0];
2166             int xy = s->mb_x*2 + 1 + (s->mb_y*2 +1)*wrap;
2167             int motion_for_top_x, motion_for_top_y, motion_back_top_x, motion_back_top_y;
2168             int motion_for_bottom_x, motion_for_bottom_y, motion_back_bottom_x, motion_back_bottom_y;
2169             if(field_pic && !s->first_field)
2170                 xy += wrap/2;
2171
2172             if (s->mb_intra) {
2173                 motion_for_top_x = motion_for_top_y = motion_back_top_x = motion_back_top_y =
2174                 motion_for_bottom_x = motion_for_bottom_y = motion_back_bottom_x = motion_back_bottom_y = 0;
2175             }else if (s->mv_type == MV_TYPE_16X16){
2176                 motion_for_top_x = motion_for_bottom_x = s->mv[0][0][0];
2177                 motion_for_top_y = motion_for_bottom_y = s->mv[0][0][1];
2178                 motion_back_top_x = motion_back_bottom_x = s->mv[1][0][0];
2179                 motion_back_top_y = motion_back_bottom_y = s->mv[1][0][1];
2180             } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2181                 motion_for_top_x = s->mv[0][0][0];
2182                 motion_for_top_y = s->mv[0][0][1];
2183                 motion_for_bottom_x = s->mv[0][1][0];
2184                 motion_for_bottom_y = s->mv[0][1][1];
2185                 motion_back_top_x = s->mv[1][0][0];
2186                 motion_back_top_y = s->mv[1][0][1];
2187                 motion_back_bottom_x = s->mv[1][1][0];
2188                 motion_back_bottom_y = s->mv[1][1][1];
2189             }
2190
2191             s->current_picture.motion_val[0][xy][0] = motion_for_top_x;
2192             s->current_picture.motion_val[0][xy][1] = motion_for_top_y;
2193             s->current_picture.motion_val[0][xy + 1][0] = motion_for_top_x;
2194             s->current_picture.motion_val[0][xy + 1][1] = motion_for_top_y;
2195             s->current_picture.motion_val[0][xy + wrap][0] = motion_for_bottom_x;
2196             s->current_picture.motion_val[0][xy + wrap][1] = motion_for_bottom_y;
2197             s->current_picture.motion_val[0][xy + 1 + wrap][0] = motion_for_bottom_x;
2198             s->current_picture.motion_val[0][xy + 1 + wrap][1] = motion_for_bottom_y;
2199
2200             if(s->pict_type != B_TYPE){
2201                 motion_back_top_x = motion_back_top_y = motion_back_bottom_x = motion_back_bottom_y = 0;
2202             }
2203
2204             s->current_picture.motion_val[1][xy][0] = motion_back_top_x;
2205             s->current_picture.motion_val[1][xy][1] = motion_back_top_y;
2206             s->current_picture.motion_val[1][xy + 1][0] = motion_back_top_x;
2207             s->current_picture.motion_val[1][xy + 1][1] = motion_back_top_y;
2208             s->current_picture.motion_val[1][xy + wrap][0] = motion_back_bottom_x;
2209             s->current_picture.motion_val[1][xy + wrap][1] = motion_back_bottom_y;
2210             s->current_picture.motion_val[1][xy + 1 + wrap][0] = motion_back_bottom_x;
2211             s->current_picture.motion_val[1][xy + 1 + wrap][1] = motion_back_bottom_y;
2212         }
2213
2214         s->dest[0] += 16;
2215         s->dest[1] += 8;
2216         s->dest[2] += 8;
2217
2218         MPV_decode_mb(s, s->block);
2219
2220         if (++s->mb_x >= s->mb_width) {
2221
2222             ff_draw_horiz_band(s, 16*s->mb_y, 16);
2223
2224             s->mb_x = 0;
2225             s->mb_y++;
2226
2227             if(s->mb_y<<field_pic >= s->mb_height){
2228                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2229
2230                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2231                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2232                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d\n", left);
2233                     return -1;
2234                 }else
2235                     goto eos;
2236             }
2237
2238             ff_init_block_index(s);
2239         }
2240
2241         /* skip mb handling */
2242         if (s->mb_skip_run == -1) {
2243             /* read again increment */
2244             s->mb_skip_run = 0;
2245             for(;;) {
2246                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2247                 if (code < 0){
2248                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2249                     return -1;
2250                 }
2251                 if (code >= 33) {
2252                     if (code == 33) {
2253                         s->mb_skip_run += 33;
2254                     }else if(code == 35){
2255                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2256                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2257                             return -1;
2258                         }
2259                         goto eos; /* end of slice */
2260                     }
2261                     /* otherwise, stuffing, nothing to do */
2262                 } else {
2263                     s->mb_skip_run += code;
2264                     break;
2265                 }
2266             }
2267         }
2268     }
2269 eos: // end of slice
2270     *buf += get_bits_count(&s->gb)/8 - 1;
2271 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2272     return 0;
2273 }
2274
2275 /**
2276  * handles slice ends.
2277  * @return 1 if it seems to be the last slice of
2278  */
2279 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2280 {
2281     Mpeg1Context *s1 = avctx->priv_data;
2282     MpegEncContext *s = &s1->mpeg_enc_ctx;
2283
2284     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2285         return 0;
2286
2287 #ifdef HAVE_XVMC
2288     if(s->avctx->xvmc_acceleration)
2289         XVMC_field_end(s);
2290 #endif
2291     /* end of slice reached */
2292     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2293         /* end of image */
2294
2295         if(s->codec_id == CODEC_ID_MPEG2VIDEO){
2296             s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2297         }else
2298             s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG1;
2299
2300         ff_er_frame_end(s);
2301
2302         MPV_frame_end(s);
2303
2304         if (s->pict_type == B_TYPE || s->low_delay) {
2305             *pict= *(AVFrame*)s->current_picture_ptr;
2306             ff_print_debug_info(s, s->current_picture_ptr);
2307         } else {
2308             s->picture_number++;
2309             /* latency of 1 frame for I and P frames */
2310             /* XXX: use another variable than picture_number */
2311             if (s->last_picture_ptr != NULL) {
2312                 *pict= *(AVFrame*)s->last_picture_ptr;
2313                  ff_print_debug_info(s, s->last_picture_ptr);
2314             }
2315         }
2316
2317         return 1;
2318     } else {
2319         return 0;
2320     }
2321 }
2322
2323 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2324                                  uint8_t *buf, int buf_size)
2325 {
2326     Mpeg1Context *s1 = avctx->priv_data;
2327     MpegEncContext *s = &s1->mpeg_enc_ctx;
2328     int width, height, i, v, j;
2329     float aspect;
2330
2331     init_get_bits(&s->gb, buf, buf_size*8);
2332
2333     width = get_bits(&s->gb, 12);
2334     height = get_bits(&s->gb, 12);
2335     s->aspect_ratio_info= get_bits(&s->gb, 4);
2336     if (s->aspect_ratio_info == 0)
2337         return -1;
2338     aspect= 1.0/mpeg1_aspect[s->aspect_ratio_info];
2339     avctx->sample_aspect_ratio= av_d2q(aspect, 255);
2340
2341     s->frame_rate_index = get_bits(&s->gb, 4);
2342     if (s->frame_rate_index == 0)
2343         return -1;
2344     s->bit_rate = get_bits(&s->gb, 18) * 400;
2345     if (get_bits1(&s->gb) == 0) /* marker */
2346         return -1;
2347     if (width <= 0 || height <= 0 ||
2348         (width % 2) != 0 || (height % 2) != 0)
2349         return -1;
2350     if (width != s->width ||
2351         height != s->height) {
2352         /* start new mpeg1 context decoding */
2353         s->out_format = FMT_MPEG1;
2354         if (s1->mpeg_enc_ctx_allocated) {
2355             MPV_common_end(s);
2356         }
2357         s->width = width;
2358         s->height = height;
2359         avctx->has_b_frames= 1;
2360         s->avctx = avctx;
2361         avctx->width = width;
2362         avctx->height = height;
2363         av_reduce(
2364             &avctx->frame_rate,
2365             &avctx->frame_rate_base,
2366             frame_rate_tab[s->frame_rate_index],
2367             MPEG1_FRAME_RATE_BASE, //FIXME store in allready reduced form
2368             1<<30
2369             );
2370         avctx->bit_rate = s->bit_rate;
2371
2372         //get_format() or set_video(width,height,aspect,pix_fmt);
2373         //until then pix_fmt may be changed right after codec init
2374         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2375             if( avctx->idct_algo == FF_IDCT_AUTO )
2376                 avctx->idct_algo = FF_IDCT_SIMPLE;
2377
2378         if (MPV_common_init(s) < 0)
2379             return -1;
2380         s1->mpeg_enc_ctx_allocated = 1;
2381         s->swap_uv = 0;//just in case vcr2 and mpeg2 stream have been concatinated
2382     }
2383
2384     skip_bits(&s->gb, 10); /* vbv_buffer_size */
2385     skip_bits(&s->gb, 1);
2386
2387     /* get matrix */
2388     if (get_bits1(&s->gb)) {
2389         for(i=0;i<64;i++) {
2390             v = get_bits(&s->gb, 8);
2391             j = s->intra_scantable.permutated[i];
2392             s->intra_matrix[j] = v;
2393             s->chroma_intra_matrix[j] = v;
2394         }
2395 #ifdef DEBUG
2396         dprintf("intra matrix present\n");
2397         for(i=0;i<64;i++)
2398             dprintf(" %d", s->intra_matrix[s->intra_scantable.permutated[i]]);
2399         printf("\n");
2400 #endif
2401     } else {
2402         for(i=0;i<64;i++) {
2403             int j= s->dsp.idct_permutation[i];
2404             v = ff_mpeg1_default_intra_matrix[i];
2405             s->intra_matrix[j] = v;
2406             s->chroma_intra_matrix[j] = v;
2407         }
2408     }
2409     if (get_bits1(&s->gb)) {
2410         for(i=0;i<64;i++) {
2411             v = get_bits(&s->gb, 8);
2412             j = s->intra_scantable.permutated[i];
2413             s->inter_matrix[j] = v;
2414             s->chroma_inter_matrix[j] = v;
2415         }
2416 #ifdef DEBUG
2417         dprintf("non intra matrix present\n");
2418         for(i=0;i<64;i++)
2419             dprintf(" %d", s->inter_matrix[s->intra_scantable.permutated[i]]);
2420         printf("\n");
2421 #endif
2422     } else {
2423         for(i=0;i<64;i++) {
2424             int j= s->dsp.idct_permutation[i];
2425             v = ff_mpeg1_default_non_intra_matrix[i];
2426             s->inter_matrix[j] = v;
2427             s->chroma_inter_matrix[j] = v;
2428         }
2429     }
2430
2431     /* we set mpeg2 parameters so that it emulates mpeg1 */
2432     s->progressive_sequence = 1;
2433     s->progressive_frame = 1;
2434     s->picture_structure = PICT_FRAME;
2435     s->frame_pred_frame_dct = 1;
2436     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2437     avctx->sub_id = 1; /* indicates mpeg1 */
2438     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2439     return 0;
2440 }
2441
2442 static int vcr2_init_sequence(AVCodecContext *avctx)
2443 {
2444     Mpeg1Context *s1 = avctx->priv_data;
2445     MpegEncContext *s = &s1->mpeg_enc_ctx;
2446     int i, v;
2447
2448     /* start new mpeg1 context decoding */
2449     s->out_format = FMT_MPEG1;
2450     if (s1->mpeg_enc_ctx_allocated) {
2451         MPV_common_end(s);
2452     }
2453     s->width = avctx->width;
2454     s->height = avctx->height;
2455     avctx->has_b_frames= 0; //true?
2456     s->low_delay= 1;
2457     s->avctx = avctx;
2458
2459     //get_format() or set_video(width,height,aspect,pix_fmt);
2460     //until then pix_fmt may be changed right after codec init
2461     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2462         if( avctx->idct_algo == FF_IDCT_AUTO )
2463             avctx->idct_algo = FF_IDCT_SIMPLE;
2464
2465     if (MPV_common_init(s) < 0)
2466         return -1;
2467     exchange_uv(s);//common init reset pblocks, so we swap them here
2468     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2469     s1->mpeg_enc_ctx_allocated = 1;
2470
2471     for(i=0;i<64;i++) {
2472         int j= s->dsp.idct_permutation[i];
2473         v = ff_mpeg1_default_intra_matrix[i];
2474         s->intra_matrix[j] = v;
2475         s->chroma_intra_matrix[j] = v;
2476
2477         v = ff_mpeg1_default_non_intra_matrix[i];
2478         s->inter_matrix[j] = v;
2479         s->chroma_inter_matrix[j] = v;
2480     }
2481
2482     s->progressive_sequence = 1;
2483     s->progressive_frame = 1;
2484     s->picture_structure = PICT_FRAME;
2485     s->frame_pred_frame_dct = 1;
2486     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2487     avctx->sub_id = 2; /* indicates mpeg2 */
2488     return 0;
2489 }
2490
2491
2492 static void mpeg_decode_user_data(AVCodecContext *avctx,
2493                                   const uint8_t *buf, int buf_size)
2494 {
2495     const uint8_t *p;
2496     int len, flags;
2497     p = buf;
2498     len = buf_size;
2499
2500     /* we parse the DTG active format information */
2501     if (len >= 5 &&
2502         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2503         flags = p[4];
2504         p += 5;
2505         len -= 5;
2506         if (flags & 0x80) {
2507             /* skip event id */
2508             if (len < 2)
2509                 return;
2510             p += 2;
2511             len -= 2;
2512         }
2513         if (flags & 0x40) {
2514             if (len < 1)
2515                 return;
2516             avctx->dtg_active_format = p[0] & 0x0f;
2517         }
2518     }
2519 }
2520
2521 /**
2522  * finds the end of the current frame in the bitstream.
2523  * @return the position of the first byte of the next frame, or -1
2524  */
2525 static int mpeg1_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
2526     ParseContext *pc= &s->parse_context;
2527     int i;
2528     uint32_t state;
2529
2530     state= pc->state;
2531
2532     i=0;
2533     if(!pc->frame_start_found){
2534         for(i=0; i<buf_size; i++){
2535             state= (state<<8) | buf[i];
2536             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2537                 i++;
2538                 pc->frame_start_found=1;
2539                 break;
2540             }
2541         }
2542     }
2543
2544     if(pc->frame_start_found){
2545         for(; i<buf_size; i++){
2546             state= (state<<8) | buf[i];
2547             if((state&0xFFFFFF00) == 0x100){
2548                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2549                     pc->frame_start_found=0;
2550                     pc->state=-1;
2551                     return i-3;
2552                 }
2553             }
2554         }
2555     }
2556     pc->state= state;
2557     return END_NOT_FOUND;
2558 }
2559
2560 /* handle buffering and image synchronisation */
2561 static int mpeg_decode_frame(AVCodecContext *avctx,
2562                              void *data, int *data_size,
2563                              uint8_t *buf, int buf_size)
2564 {
2565     Mpeg1Context *s = avctx->priv_data;
2566     uint8_t *buf_end, *buf_ptr;
2567     int ret, start_code, input_size;
2568     AVFrame *picture = data;
2569     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2570     dprintf("fill_buffer\n");
2571
2572     *data_size = 0;
2573
2574     /* special case for last picture */
2575     if (buf_size == 0 && s2->low_delay==0 && s2->next_picture_ptr) {
2576         *picture= *(AVFrame*)s2->next_picture_ptr;
2577         s2->next_picture_ptr= NULL;
2578
2579         *data_size = sizeof(AVFrame);
2580         return 0;
2581     }
2582
2583     if(s2->flags&CODEC_FLAG_TRUNCATED){
2584         int next= mpeg1_find_frame_end(s2, buf, buf_size);
2585
2586         if( ff_combine_frame(s2, next, &buf, &buf_size) < 0 )
2587             return buf_size;
2588     }
2589
2590     buf_ptr = buf;
2591     buf_end = buf + buf_size;
2592
2593 #if 0
2594     if (s->repeat_field % 2 == 1) {
2595         s->repeat_field++;
2596         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2597         //        s2->picture_number, s->repeat_field);
2598         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2599             *data_size = sizeof(AVPicture);
2600             goto the_end;
2601         }
2602     }
2603 #endif
2604
2605     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2606         vcr2_init_sequence(avctx);
2607
2608     for(;;) {
2609         /* find start next code */
2610         start_code = find_start_code(&buf_ptr, buf_end);
2611         if (start_code < 0){
2612             if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
2613                 if (slice_end(avctx, picture)) {
2614                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2615                         *data_size = sizeof(AVPicture);
2616                 }
2617             }
2618             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2619         }
2620
2621         input_size = buf_end - buf_ptr;
2622
2623         if(avctx->debug & FF_DEBUG_STARTCODE){
2624             av_log(avctx, AV_LOG_DEBUG, "%3X at %d left %d\n", start_code, buf_ptr-buf, input_size);
2625         }
2626
2627                 /* prepare data for next start code */
2628                 switch(start_code) {
2629                 case SEQ_START_CODE:
2630                     mpeg1_decode_sequence(avctx, buf_ptr,
2631                                           input_size);
2632                     break;
2633
2634                 case PICTURE_START_CODE:
2635                     /* we have a complete image : we try to decompress it */
2636                     mpeg1_decode_picture(avctx,
2637                                          buf_ptr, input_size);
2638                     break;
2639                 case EXT_START_CODE:
2640                     mpeg_decode_extension(avctx,
2641                                           buf_ptr, input_size);
2642                     break;
2643                 case USER_START_CODE:
2644                     mpeg_decode_user_data(avctx,
2645                                           buf_ptr, input_size);
2646                     break;
2647                 case GOP_START_CODE:
2648                     s2->first_field=0;
2649                     break;
2650                 default:
2651                     if (start_code >= SLICE_MIN_START_CODE &&
2652                         start_code <= SLICE_MAX_START_CODE) {
2653
2654                         /* skip b frames if we dont have reference frames */
2655                         if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2656                         /* skip b frames if we are in a hurry */
2657                         if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2658                         /* skip everything if we are in a hurry>=5 */
2659                         if(avctx->hurry_up>=5) break;
2660
2661                         if (!s->mpeg_enc_ctx_allocated) break;
2662
2663                         ret = mpeg_decode_slice(avctx, picture,
2664                                                 start_code, &buf_ptr, input_size);
2665                         emms_c();
2666
2667                         if(ret < 0){
2668                             if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2669                                 ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
2670                             if(ret==DECODE_SLICE_FATAL_ERROR) return -1;
2671                         }else{
2672                             ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, AC_END|DC_END|MV_END);
2673                         }
2674                     }
2675                     break;
2676                 }
2677     }
2678 }
2679
2680 static int mpeg_decode_end(AVCodecContext *avctx)
2681 {
2682     Mpeg1Context *s = avctx->priv_data;
2683
2684     if (s->mpeg_enc_ctx_allocated)
2685         MPV_common_end(&s->mpeg_enc_ctx);
2686     return 0;
2687 }
2688
2689 AVCodec mpeg1video_decoder = {
2690     "mpeg1video",
2691     CODEC_TYPE_VIDEO,
2692     CODEC_ID_MPEG1VIDEO,
2693     sizeof(Mpeg1Context),
2694     mpeg_decode_init,
2695     NULL,
2696     mpeg_decode_end,
2697     mpeg_decode_frame,
2698     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2699     .flush= ff_mpeg_flush,
2700 };
2701
2702 AVCodec mpeg2video_decoder = {
2703     "mpeg2video",
2704     CODEC_TYPE_VIDEO,
2705     CODEC_ID_MPEG2VIDEO,
2706     sizeof(Mpeg1Context),
2707     mpeg_decode_init,
2708     NULL,
2709     mpeg_decode_end,
2710     mpeg_decode_frame,
2711     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2712     .flush= ff_mpeg_flush,
2713 };
2714
2715 //legacy decoder
2716 AVCodec mpegvideo_decoder = {
2717     "mpegvideo",
2718     CODEC_TYPE_VIDEO,
2719     CODEC_ID_MPEG2VIDEO,
2720     sizeof(Mpeg1Context),
2721     mpeg_decode_init,
2722     NULL,
2723     mpeg_decode_end,
2724     mpeg_decode_frame,
2725     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2726     .flush= ff_mpeg_flush,
2727 };
2728
2729 #ifdef HAVE_XVMC
2730 static int mpeg_mc_decode_init(AVCodecContext *avctx){
2731     Mpeg1Context *s;
2732
2733     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2734         return -1;
2735     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2736         dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2737     }
2738     mpeg_decode_init(avctx);
2739     s = avctx->priv_data;
2740
2741     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2742     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2743
2744     return 0;
2745 }
2746
2747 AVCodec mpeg_xvmc_decoder = {
2748     "mpegvideo_xvmc",
2749     CODEC_TYPE_VIDEO,
2750     CODEC_ID_MPEG2VIDEO_XVMC,
2751     sizeof(Mpeg1Context),
2752     mpeg_mc_decode_init,
2753     NULL,
2754     mpeg_decode_end,
2755     mpeg_decode_frame,
2756     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2757 };
2758
2759 #endif
2760
2761 /* this is ugly i know, but the alternative is too make
2762    hundreds of vars global and prefix them with ff_mpeg1_
2763    which is far uglier. */
2764 #include "mdec.c"