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

   1 /*
   2  * MPEG1 codec / MPEG2 decoder
   3  * Copyright (c) 2000,2001 Fabrice Bellard.
   4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 /**
  22  * @file mpeg12.c
  23  * MPEG1/2 codec
  24  */
  25
  26 //#define DEBUG
  27 #include "avcodec.h"
  28 #include "dsputil.h"
  29 #include "mpegvideo.h"
  30
  31 #include "mpeg12data.h"
  32
  33 //#undef NDEBUG
  34 //#include <assert.h>
  35
  36
  37 /* Start codes. */
  38 #define SEQ_END_CODE            0x000001b7
  39 #define SEQ_START_CODE          0x000001b3
  40 #define GOP_START_CODE          0x000001b8
  41 #define PICTURE_START_CODE      0x00000100
  42 #define SLICE_MIN_START_CODE    0x00000101
  43 #define SLICE_MAX_START_CODE    0x000001af
  44 #define EXT_START_CODE          0x000001b5
  45 #define USER_START_CODE         0x000001b2
  46
  47 #define DC_VLC_BITS 9
  48 #define MV_VLC_BITS 9
  49 #define MBINCR_VLC_BITS 9
  50 #define MB_PAT_VLC_BITS 9
  51 #define MB_PTYPE_VLC_BITS 6
  52 #define MB_BTYPE_VLC_BITS 6
  53 #define TEX_VLC_BITS 9
  54
  55 #ifdef CONFIG_ENCODERS
  56 static void mpeg1_encode_block(MpegEncContext *s,
  57                          DCTELEM *block,
  58                          int component);
  59 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
  60 #endif //CONFIG_ENCODERS
  61 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
  62                               DCTELEM *block,
  63                               int n);
  64 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
  65                               DCTELEM *block,
  66                               int n);
  67 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
  68                                         DCTELEM *block,
  69                                         int n);
  70 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
  71                                     DCTELEM *block,
  72                                     int n);
  73 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
  74 static void exchange_uv(MpegEncContext *s);
  75
  76 #ifdef HAVE_XVMC
  77 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
  78 extern int XVMC_field_end(MpegEncContext *s);
  79 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
  80 extern void XVMC_init_block(MpegEncContext *s);//set s->block
  81 #endif
  82
  83 const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
  84 const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
  85 const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
  86 const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
  87                                            PIX_FMT_XVMC_MPEG2_IDCT,
  88                                            PIX_FMT_XVMC_MPEG2_MC,
  89                                            -1};
  90 #ifdef CONFIG_ENCODERS
  91 static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
  92 static uint8_t fcode_tab[MAX_MV*2+1];
  93
  94 static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
  95 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
  96
  97 /* simple include everything table for dc, first byte is bits number next 3 are code*/
  98 static uint32_t mpeg1_lum_dc_uni[512];
  99 static uint32_t mpeg1_chr_dc_uni[512];
 100
 101 static uint8_t mpeg1_index_run[2][64];
 102 static int8_t mpeg1_max_level[2][64];
 103 #endif //CONFIG_ENCODERS
 104
 105 static void init_2d_vlc_rl(RLTable *rl)
 106 {
 107     int i;
 108
 109     init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
 110              &rl->table_vlc[0][1], 4, 2,
 111              &rl->table_vlc[0][0], 4, 2);
 112
 113
 114     rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
 115     for(i=0; i<rl->vlc.table_size; i++){
 116         int code= rl->vlc.table[i][0];
 117         int len = rl->vlc.table[i][1];
 118         int level, run;
 119
 120         if(len==0){ // illegal code
 121             run= 65;
 122             level= MAX_LEVEL;
 123         }else if(len<0){ //more bits needed
 124             run= 0;
 125             level= code;
 126         }else{
 127             if(code==rl->n){ //esc
 128                 run= 65;
 129                 level= 0;
 130             }else if(code==rl->n+1){ //eob
 131                 run= 0;
 132                 level= 127;
 133             }else{
 134                 run=   rl->table_run  [code] + 1;
 135                 level= rl->table_level[code];
 136             }
 137         }
 138         rl->rl_vlc[0][i].len= len;
 139         rl->rl_vlc[0][i].level= level;
 140         rl->rl_vlc[0][i].run= run;
 141     }
 142 }
 143
 144 #ifdef CONFIG_ENCODERS
 145 static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
 146     int i;
 147
 148     for(i=0; i<128; i++){
 149         int level= i-64;
 150         int run;
 151         for(run=0; run<64; run++){
 152             int len, bits, code;
 153
 154             int alevel= ABS(level);
 155             int sign= (level>>31)&1;
 156
 157             if (alevel > rl->max_level[0][run])
 158                 code= 111; /*rl->n*/
 159             else
 160                 code= rl->index_run[0][run] + alevel - 1;
 161
 162             if (code < 111 /* rl->n */) {
 163                 /* store the vlc & sign at once */
 164                 len=   mpeg1_vlc[code][1]+1;
 165                 bits= (mpeg1_vlc[code][0]<<1) + sign;
 166             } else {
 167                 len=  mpeg1_vlc[111/*rl->n*/][1]+6;
 168                 bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
 169
 170                 bits|= run;
 171                 if (alevel < 128) {
 172                     bits<<=8; len+=8;
 173                     bits|= level & 0xff;
 174                 } else {
 175                     bits<<=16; len+=16;
 176                     bits|= level & 0xff;
 177                     if (level < 0) {
 178                         bits|= 0x8001 + level + 255;
 179                     } else {
 180                         bits|= level & 0xffff;
 181                     }
 182                 }
 183             }
 184
 185             uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
 186             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
 187         }
 188     }
 189 }
 190
 191
 192 static int find_frame_rate_index(MpegEncContext *s){
 193     int i;
 194     int64_t dmin= INT64_MAX;
 195     int64_t d;
 196
 197     for(i=1;i<14;i++) {
 198         int64_t n0= 1001LL/frame_rate_tab[i].den*frame_rate_tab[i].num*s->avctx->frame_rate_base;
 199         int64_t n1= 1001LL*s->avctx->frame_rate;
 200         if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
 201
 202         d = ABS(n0 - n1);
 203         if(d < dmin){
 204             dmin=d;
 205             s->frame_rate_index= i;
 206         }
 207     }
 208     if(dmin)
 209         return -1;
 210     else
 211         return 0;
 212 }
 213
 214 static int encode_init(AVCodecContext *avctx)
 215 {
 216     MpegEncContext *s = avctx->priv_data;
 217
 218     if(MPV_encode_init(avctx) < 0)
 219         return -1;
 220
 221     if(find_frame_rate_index(s) < 0){
 222         if(s->strict_std_compliance >=0){
 223             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 doesnt support %d/%d fps\n", avctx->frame_rate, avctx->frame_rate_base);
 224             return -1;
 225         }else{
 226             av_log(avctx, AV_LOG_INFO, "MPEG1/2 doesnt support %d/%d fps, there may be AV sync issues\n", avctx->frame_rate, avctx->frame_rate_base);
 227         }
 228     }
 229
 230     return 0;
 231 }
 232
 233 static void put_header(MpegEncContext *s, int header)
 234 {
 235     align_put_bits(&s->pb);
 236     put_bits(&s->pb, 16, header>>16);
 237     put_bits(&s->pb, 16, header&0xFFFF);
 238 }
 239
 240 /* put sequence header if needed */
 241 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 242 {
 243         unsigned int vbv_buffer_size;
 244         unsigned int fps, v;
 245         int i;
 246         uint64_t time_code;
 247         float best_aspect_error= 1E10;
 248         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 249         int constraint_parameter_flag;
 250
 251         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 252
 253         if (s->current_picture.key_frame) {
 254             AVRational framerate= frame_rate_tab[s->frame_rate_index];
 255
 256             /* mpeg1 header repeated every gop */
 257             put_header(s, SEQ_START_CODE);
 258
 259             put_bits(&s->pb, 12, s->width);
 260             put_bits(&s->pb, 12, s->height);
 261
 262             for(i=1; i<15; i++){
 263                 float error= aspect_ratio;
 264                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
 265                     error-= 1.0/mpeg1_aspect[i];
 266                 else
 267                     error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
 268
 269                 error= ABS(error);
 270
 271                 if(error < best_aspect_error){
 272                     best_aspect_error= error;
 273                     s->aspect_ratio_info= i;
 274                 }
 275             }
 276
 277             put_bits(&s->pb, 4, s->aspect_ratio_info);
 278             put_bits(&s->pb, 4, s->frame_rate_index);
 279
 280             if(s->avctx->rc_max_rate){
 281                 v = (s->avctx->rc_max_rate + 399) / 400;
 282                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
 283                     v = 0x3ffff;
 284             }else{
 285                 v= 0x3FFFF;
 286             }
 287
 288             if(s->avctx->rc_buffer_size)
 289                 vbv_buffer_size = s->avctx->rc_buffer_size;
 290             else
 291                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 292                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 293             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 294
 295             put_bits(&s->pb, 18, v & 0x3FFFF);
 296             put_bits(&s->pb, 1, 1); /* marker */
 297             put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
 298
 299             constraint_parameter_flag=
 300                 s->width <= 768 && s->height <= 576 &&
 301                 s->mb_width * s->mb_height <= 396 &&
 302                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 303                 framerate.num <= framerate.den*30 &&
 304                 vbv_buffer_size <= 20 &&
 305                 v <= 1856000/400 &&
 306                 s->codec_id == CODEC_ID_MPEG1VIDEO;
 307
 308             put_bits(&s->pb, 1, constraint_parameter_flag);
 309
 310             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 311             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 312
 313             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 314                 put_header(s, EXT_START_CODE);
 315                 put_bits(&s->pb, 4, 1); //seq ext
 316                 put_bits(&s->pb, 1, 0); //esc
 317                 put_bits(&s->pb, 3, 4); //profile
 318                 put_bits(&s->pb, 4, 8); //level
 319                 put_bits(&s->pb, 1, s->progressive_sequence);
 320                 put_bits(&s->pb, 2, 1); //chroma format 4:2:0
 321                 put_bits(&s->pb, 2, 0); //horizontal size ext
 322                 put_bits(&s->pb, 2, 0); //vertical size ext
 323                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 324                 put_bits(&s->pb, 1, 1); //marker
 325                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 326                 put_bits(&s->pb, 1, s->low_delay);
 327                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
 328                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
 329             }
 330
 331             put_header(s, GOP_START_CODE);
 332             put_bits(&s->pb, 1, 0); /* do drop frame */
 333             /* time code : we must convert from the real frame rate to a
 334                fake mpeg frame rate in case of low frame rate */
 335             fps = (framerate.num + framerate.den/2)/ framerate.den;
 336             time_code = s->current_picture_ptr->coded_picture_number;
 337
 338             s->gop_picture_number = time_code;
 339             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 340             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 341             put_bits(&s->pb, 1, 1);
 342             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 343             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 344             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 345             put_bits(&s->pb, 1, 0); /* broken link */
 346         }
 347 }
 348
 349 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 350     while (run >= 33) {
 351         put_bits(&s->pb, 11, 0x008);
 352         run -= 33;
 353     }
 354     put_bits(&s->pb, mbAddrIncrTable[run][1],
 355              mbAddrIncrTable[run][0]);
 356 }
 357 #endif //CONFIG_ENCODERS
 358
 359 static void common_init(MpegEncContext *s)
 360 {
 361
 362     s->y_dc_scale_table=
 363     s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
 364
 365 }
 366
 367 void ff_mpeg1_clean_buffers(MpegEncContext *s){
 368     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
 369     s->last_dc[1] = s->last_dc[0];
 370     s->last_dc[2] = s->last_dc[0];
 371     memset(s->last_mv, 0, sizeof(s->last_mv));
 372 }
 373
 374 #ifdef CONFIG_ENCODERS
 375
 376 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 377     put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 378     put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
 379     put_bits(&s->pb, 1, 0); /* slice extra information */
 380 }
 381
 382 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 383 {
 384     mpeg1_encode_sequence_header(s);
 385
 386     /* mpeg1 picture header */
 387     put_header(s, PICTURE_START_CODE);
 388     /* temporal reference */
 389
 390     // RAL: s->picture_number instead of s->fake_picture_number
 391     put_bits(&s->pb, 10, (s->picture_number -
 392                           s->gop_picture_number) & 0x3ff);
 393     put_bits(&s->pb, 3, s->pict_type);
 394
 395     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 396     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 397
 398     // RAL: Forward f_code also needed for B frames
 399     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
 400         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 401         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 402             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 403         else
 404             put_bits(&s->pb, 3, 7); /* forward_f_code */
 405     }
 406
 407     // RAL: Backward f_code necessary for B frames
 408     if (s->pict_type == B_TYPE) {
 409         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 410         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 411             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 412         else
 413             put_bits(&s->pb, 3, 7); /* backward_f_code */
 414     }
 415
 416     put_bits(&s->pb, 1, 0); /* extra bit picture */
 417
 418     s->frame_pred_frame_dct = 1;
 419     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 420         put_header(s, EXT_START_CODE);
 421         put_bits(&s->pb, 4, 8); //pic ext
 422         if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
 423             put_bits(&s->pb, 4, s->f_code);
 424             put_bits(&s->pb, 4, s->f_code);
 425         }else{
 426             put_bits(&s->pb, 8, 255);
 427         }
 428         if (s->pict_type == B_TYPE) {
 429             put_bits(&s->pb, 4, s->b_code);
 430             put_bits(&s->pb, 4, s->b_code);
 431         }else{
 432             put_bits(&s->pb, 8, 255);
 433         }
 434         put_bits(&s->pb, 2, s->intra_dc_precision);
 435
 436         assert(s->picture_structure == PICT_FRAME);
 437         put_bits(&s->pb, 2, s->picture_structure);
 438         if (s->progressive_sequence) {
 439             put_bits(&s->pb, 1, 0); /* no repeat */
 440         } else {
 441             put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
 442         }
 443         /* XXX: optimize the generation of this flag with entropy
 444            measures */
 445         s->frame_pred_frame_dct = s->progressive_sequence;
 446
 447         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 448         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 449         put_bits(&s->pb, 1, s->q_scale_type);
 450         put_bits(&s->pb, 1, s->intra_vlc_format);
 451         put_bits(&s->pb, 1, s->alternate_scan);
 452         put_bits(&s->pb, 1, s->repeat_first_field);
 453         put_bits(&s->pb, 1, s->chroma_420_type=1);
 454         s->progressive_frame = s->progressive_sequence;
 455         put_bits(&s->pb, 1, s->progressive_frame);
 456         put_bits(&s->pb, 1, 0); //composite_display_flag
 457     }
 458     if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
 459         int i;
 460
 461         put_header(s, USER_START_CODE);
 462         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 463             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 464         }
 465     }
 466
 467     s->mb_y=0;
 468     ff_mpeg1_encode_slice_header(s);
 469 }
 470
 471 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 472                                 int has_mv, int field_motion)
 473 {
 474     put_bits(&s->pb, n, bits);
 475     if (!s->frame_pred_frame_dct) {
 476         if (has_mv)
 477             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 478         put_bits(&s->pb, 1, s->interlaced_dct);
 479     }
 480 }
 481
 482 void mpeg1_encode_mb(MpegEncContext *s,
 483                      DCTELEM block[6][64],
 484                      int motion_x, int motion_y)
 485 {
 486     int i, cbp;
 487     const int mb_x = s->mb_x;
 488     const int mb_y = s->mb_y;
 489     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 490
 491     /* compute cbp */
 492     cbp = 0;
 493     for(i=0;i<6;i++) {
 494         if (s->block_last_index[i] >= 0)
 495             cbp |= 1 << (5 - i);
 496     }
 497
 498     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 499         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
 500         ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
 501         (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) |
 502         ((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))) {
 503         s->mb_skip_run++;
 504         s->qscale -= s->dquant;
 505         s->skip_count++;
 506         s->misc_bits++;
 507         s->last_bits++;
 508         if(s->pict_type == P_TYPE){
 509             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 510             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 511         }
 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, 0); /* macroblock_type : macroblock_quant = 1 */
 523                 put_bits(&s->pb, 5, s->qscale);
 524             }else{
 525                 put_mb_modes(s, 1, 1, 0, 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, 0);
 533                 put_bits(&s->pb, 5, s->qscale);
 534             }else{
 535                 put_mb_modes(s, 5, 0x03, 0, 0);
 536                 s->qscale -= s->dquant;
 537             }
 538             s->misc_bits+= get_bits_diff(s);
 539             s->i_count++;
 540             memset(s->last_mv, 0, sizeof(s->last_mv));
 541         } else if (s->pict_type == P_TYPE) {
 542             if(s->mv_type == MV_TYPE_16X16){
 543                 if (cbp != 0) {
 544                     if ((motion_x|motion_y) == 0) {
 545                         if(s->dquant){
 546                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 547                             put_bits(&s->pb, 5, s->qscale);
 548                         }else{
 549                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 550                         }
 551                         s->misc_bits+= get_bits_diff(s);
 552                     } else {
 553                         if(s->dquant){
 554                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 555                             put_bits(&s->pb, 5, s->qscale);
 556                         }else{
 557                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 558                         }
 559                         s->misc_bits+= get_bits_diff(s);
 560                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 561                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 562                         s->mv_bits+= get_bits_diff(s);
 563                     }
 564                 } else {
 565                     put_bits(&s->pb, 3, 1); /* motion only */
 566                     if (!s->frame_pred_frame_dct)
 567                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 568                     s->misc_bits+= get_bits_diff(s);
 569                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 570                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 571                     s->qscale -= s->dquant;
 572                     s->mv_bits+= get_bits_diff(s);
 573                 }
 574                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 575                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 576             }else{
 577                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 578
 579                 if (cbp) {
 580                     if(s->dquant){
 581                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 582                         put_bits(&s->pb, 5, s->qscale);
 583                     }else{
 584                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 585                     }
 586                 } else {
 587                     put_bits(&s->pb, 3, 1); /* motion only */
 588                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 589                     s->qscale -= s->dquant;
 590                 }
 591                 s->misc_bits+= get_bits_diff(s);
 592                 for(i=0; i<2; i++){
 593                     put_bits(&s->pb, 1, s->field_select[0][i]);
 594                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 595                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 596                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 597                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 598                 }
 599                 s->mv_bits+= get_bits_diff(s);
 600             }
 601             if(cbp)
 602                 put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
 603             s->f_count++;
 604         } else{
 605             static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
 606
 607             if(s->mv_type == MV_TYPE_16X16){
 608                 if (cbp){    // With coded bloc pattern
 609                     if (s->dquant) {
 610                         if(s->mv_dir == MV_DIR_FORWARD)
 611                             put_mb_modes(s, 6, 3, 1, 0);
 612                         else
 613                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
 614                         put_bits(&s->pb, 5, s->qscale);
 615                     } else {
 616                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
 617                     }
 618                 }else{    // No coded bloc pattern
 619                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
 620                     if (!s->frame_pred_frame_dct)
 621                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 622                     s->qscale -= s->dquant;
 623                 }
 624                 s->misc_bits += get_bits_diff(s);
 625                 if (s->mv_dir&MV_DIR_FORWARD){
 626                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 627                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 628                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 629                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 630                     s->f_count++;
 631                 }
 632                 if (s->mv_dir&MV_DIR_BACKWARD){
 633                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 634                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 635                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 636                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 637                     s->b_count++;
 638                 }
 639             }else{
 640                 assert(s->mv_type == MV_TYPE_FIELD);
 641                 assert(!s->frame_pred_frame_dct);
 642                 if (cbp){    // With coded bloc pattern
 643                     if (s->dquant) {
 644                         if(s->mv_dir == MV_DIR_FORWARD)
 645                             put_mb_modes(s, 6, 3, 1, 1);
 646                         else
 647                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
 648                         put_bits(&s->pb, 5, s->qscale);
 649                     } else {
 650                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
 651                     }
 652                 }else{    // No coded bloc pattern
 653                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
 654                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 655                     s->qscale -= s->dquant;
 656                 }
 657                 s->misc_bits += get_bits_diff(s);
 658                 if (s->mv_dir&MV_DIR_FORWARD){
 659                     for(i=0; i<2; i++){
 660                         put_bits(&s->pb, 1, s->field_select[0][i]);
 661                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 662                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 663                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 664                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 665                     }
 666                     s->f_count++;
 667                 }
 668                 if (s->mv_dir&MV_DIR_BACKWARD){
 669                     for(i=0; i<2; i++){
 670                         put_bits(&s->pb, 1, s->field_select[1][i]);
 671                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 672                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 673                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 674                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 675                     }
 676                     s->b_count++;
 677                 }
 678             }
 679             s->mv_bits += get_bits_diff(s);
 680             if(cbp)
 681                 put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
 682         }
 683         for(i=0;i<6;i++) {
 684             if (cbp & (1 << (5 - i))) {
 685                 mpeg1_encode_block(s, block[i], i);
 686             }
 687         }
 688         s->mb_skip_run = 0;
 689         if(s->mb_intra)
 690             s->i_tex_bits+= get_bits_diff(s);
 691         else
 692             s->p_tex_bits+= get_bits_diff(s);
 693     }
 694 }
 695
 696 // RAL: Parameter added: f_or_b_code
 697 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 698 {
 699     int code, bit_size, l, m, bits, range, sign;
 700
 701     if (val == 0) {
 702         /* zero vector */
 703         code = 0;
 704         put_bits(&s->pb,
 705                  mbMotionVectorTable[0][1],
 706                  mbMotionVectorTable[0][0]);
 707     } else {
 708         bit_size = f_or_b_code - 1;
 709         range = 1 << bit_size;
 710         /* modulo encoding */
 711         l = 16 * range;
 712         m = 2 * l;
 713         if (val < -l) {
 714             val += m;
 715         } else if (val >= l) {
 716             val -= m;
 717         }
 718
 719         if (val >= 0) {
 720             val--;
 721             code = (val >> bit_size) + 1;
 722             bits = val & (range - 1);
 723             sign = 0;
 724         } else {
 725             val = -val;
 726             val--;
 727             code = (val >> bit_size) + 1;
 728             bits = val & (range - 1);
 729             sign = 1;
 730         }
 731
 732         assert(code > 0 && code <= 16);
 733
 734         put_bits(&s->pb,
 735                  mbMotionVectorTable[code][1],
 736                  mbMotionVectorTable[code][0]);
 737
 738         put_bits(&s->pb, 1, sign);
 739         if (bit_size > 0) {
 740             put_bits(&s->pb, bit_size, bits);
 741         }
 742     }
 743 }
 744
 745 void ff_mpeg1_encode_init(MpegEncContext *s)
 746 {
 747     static int done=0;
 748
 749     common_init(s);
 750
 751     if(!done){
 752         int f_code;
 753         int mv;
 754         int i;
 755
 756         done=1;
 757         init_rl(&rl_mpeg1);
 758
 759         for(i=0; i<64; i++)
 760         {
 761                 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
 762                 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
 763         }
 764
 765         init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
 766
 767         /* build unified dc encoding tables */
 768         for(i=-255; i<256; i++)
 769         {
 770                 int adiff, index;
 771                 int bits, code;
 772                 int diff=i;
 773
 774                 adiff = ABS(diff);
 775                 if(diff<0) diff--;
 776                 index = av_log2(2*adiff);
 777
 778                 bits= vlc_dc_lum_bits[index] + index;
 779                 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 780                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 781
 782                 bits= vlc_dc_chroma_bits[index] + index;
 783                 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 784                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 785         }
 786
 787         mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
 788
 789         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 790             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 791                 int len;
 792
 793                 if(mv==0) len= mbMotionVectorTable[0][1];
 794                 else{
 795                     int val, bit_size, range, code;
 796
 797                     bit_size = f_code - 1;
 798                     range = 1 << bit_size;
 799
 800                     val=mv;
 801                     if (val < 0)
 802                         val = -val;
 803                     val--;
 804                     code = (val >> bit_size) + 1;
 805                     if(code<17){
 806                         len= mbMotionVectorTable[code][1] + 1 + bit_size;
 807                     }else{
 808                         len= mbMotionVectorTable[16][1] + 2 + bit_size;
 809                     }
 810                 }
 811
 812                 mv_penalty[f_code][mv+MAX_MV]= len;
 813             }
 814         }
 815
 816
 817         for(f_code=MAX_FCODE; f_code>0; f_code--){
 818             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 819                 fcode_tab[mv+MAX_MV]= f_code;
 820             }
 821         }
 822     }
 823     s->me.mv_penalty= mv_penalty;
 824     s->fcode_tab= fcode_tab;
 825     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 826         s->min_qcoeff=-255;
 827         s->max_qcoeff= 255;
 828     }else{
 829         s->min_qcoeff=-2047;
 830         s->max_qcoeff= 2047;
 831     }
 832     s->intra_ac_vlc_length=
 833     s->inter_ac_vlc_length=
 834     s->intra_ac_vlc_last_length=
 835     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 836 }
 837
 838 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 839 {
 840   if(((unsigned) (diff+255)) >= 511){
 841         int index;
 842
 843         if(diff<0){
 844             index= av_log2_16bit(-2*diff);
 845             diff--;
 846         }else{
 847             index= av_log2_16bit(2*diff);
 848         }
 849         if (component == 0) {
 850             put_bits(
 851                 &s->pb,
 852                 vlc_dc_lum_bits[index] + index,
 853                 (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 854         }else{
 855             put_bits(
 856                 &s->pb,
 857                 vlc_dc_chroma_bits[index] + index,
 858                 (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 859         }
 860   }else{
 861     if (component == 0) {
 862         put_bits(
 863             &s->pb,
 864             mpeg1_lum_dc_uni[diff+255]&0xFF,
 865             mpeg1_lum_dc_uni[diff+255]>>8);
 866     } else {
 867         put_bits(
 868             &s->pb,
 869             mpeg1_chr_dc_uni[diff+255]&0xFF,
 870             mpeg1_chr_dc_uni[diff+255]>>8);
 871     }
 872   }
 873 }
 874
 875 static void mpeg1_encode_block(MpegEncContext *s,
 876                                DCTELEM *block,
 877                                int n)
 878 {
 879     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 880     int code, component;
 881 //    RLTable *rl = &rl_mpeg1;
 882
 883     last_index = s->block_last_index[n];
 884
 885     /* DC coef */
 886     if (s->mb_intra) {
 887         component = (n <= 3 ? 0 : n - 4 + 1);
 888         dc = block[0]; /* overflow is impossible */
 889         diff = dc - s->last_dc[component];
 890         encode_dc(s, diff, component);
 891         s->last_dc[component] = dc;
 892         i = 1;
 893 /*
 894         if (s->intra_vlc_format)
 895             rl = &rl_mpeg2;
 896         else
 897             rl = &rl_mpeg1;
 898 */
 899     } else {
 900         /* encode the first coefficient : needs to be done here because
 901            it is handled slightly differently */
 902         level = block[0];
 903         if (abs(level) == 1) {
 904                 code = ((uint32_t)level >> 31); /* the sign bit */
 905                 put_bits(&s->pb, 2, code | 0x02);
 906                 i = 1;
 907         } else {
 908             i = 0;
 909             last_non_zero = -1;
 910             goto next_coef;
 911         }
 912     }
 913
 914     /* now quantify & encode AC coefs */
 915     last_non_zero = i - 1;
 916
 917     for(;i<=last_index;i++) {
 918         j = s->intra_scantable.permutated[i];
 919         level = block[j];
 920     next_coef:
 921 #if 0
 922         if (level != 0)
 923             dprintf("level[%d]=%d\n", i, level);
 924 #endif
 925         /* encode using VLC */
 926         if (level != 0) {
 927             run = i - last_non_zero - 1;
 928
 929             alevel= level;
 930             MASK_ABS(sign, alevel)
 931             sign&=1;
 932
 933 //            code = get_rl_index(rl, 0, run, alevel);
 934             if (alevel <= mpeg1_max_level[0][run]){
 935                 code= mpeg1_index_run[0][run] + alevel - 1;
 936                 /* store the vlc & sign at once */
 937                 put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
 938             } else {
 939                 /* escape seems to be pretty rare <5% so i dont optimize it */
 940                 put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
 941                 /* escape: only clip in this case */
 942                 put_bits(&s->pb, 6, run);
 943                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 944                     if (alevel < 128) {
 945                         put_bits(&s->pb, 8, level & 0xff);
 946                     } else {
 947                         if (level < 0) {
 948                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 949                         } else {
 950                             put_bits(&s->pb, 16, level & 0xffff);
 951                         }
 952                     }
 953                 }else{
 954                     put_bits(&s->pb, 12, level & 0xfff);
 955                 }
 956             }
 957             last_non_zero = i;
 958         }
 959     }
 960     /* end of block */
 961     put_bits(&s->pb, 2, 0x2);
 962 }
 963 #endif //CONFIG_ENCODERS
 964
 965 /******************************************/
 966 /* decoding */
 967
 968 static VLC dc_lum_vlc;
 969 static VLC dc_chroma_vlc;
 970 static VLC mv_vlc;
 971 static VLC mbincr_vlc;
 972 static VLC mb_ptype_vlc;
 973 static VLC mb_btype_vlc;
 974 static VLC mb_pat_vlc;
 975
 976 static void init_vlcs(void)
 977 {
 978     static int done = 0;
 979
 980     if (!done) {
 981         done = 1;
 982
 983         init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
 984                  vlc_dc_lum_bits, 1, 1,
 985                  vlc_dc_lum_code, 2, 2);
 986         init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
 987                  vlc_dc_chroma_bits, 1, 1,
 988                  vlc_dc_chroma_code, 2, 2);
 989         init_vlc(&mv_vlc, MV_VLC_BITS, 17,
 990                  &mbMotionVectorTable[0][1], 2, 1,
 991                  &mbMotionVectorTable[0][0], 2, 1);
 992         init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
 993                  &mbAddrIncrTable[0][1], 2, 1,
 994                  &mbAddrIncrTable[0][0], 2, 1);
 995         init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
 996                  &mbPatTable[0][1], 2, 1,
 997                  &mbPatTable[0][0], 2, 1);
 998
 999         init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
1000                  &table_mb_ptype[0][1], 2, 1,
1001                  &table_mb_ptype[0][0], 2, 1);
1002         init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
1003                  &table_mb_btype[0][1], 2, 1,
1004                  &table_mb_btype[0][0], 2, 1);
1005         init_rl(&rl_mpeg1);
1006         init_rl(&rl_mpeg2);
1007
1008         init_2d_vlc_rl(&rl_mpeg1);
1009         init_2d_vlc_rl(&rl_mpeg2);
1010     }
1011 }
1012
1013 static inline int get_dmv(MpegEncContext *s)
1014 {
1015     if(get_bits1(&s->gb))
1016         return 1 - (get_bits1(&s->gb) << 1);
1017     else
1018         return 0;
1019 }
1020
1021 static inline int get_qscale(MpegEncContext *s)
1022 {
1023     int qscale = get_bits(&s->gb, 5);
1024     if (s->q_scale_type) {
1025         return non_linear_qscale[qscale];
1026     } else {
1027         return qscale << 1;
1028     }
1029 }
1030
1031 /* motion type (for mpeg2) */
1032 #define MT_FIELD 1
1033 #define MT_FRAME 2
1034 #define MT_16X8  2
1035 #define MT_DMV   3
1036
1037 static int mpeg_decode_mb(MpegEncContext *s,
1038                           DCTELEM block[12][64])
1039 {
1040     int i, j, k, cbp, val, mb_type, motion_type;
1041
1042     dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1043
1044     assert(s->mb_skiped==0);
1045
1046     if (s->mb_skip_run-- != 0) {
1047         if(s->pict_type == I_TYPE){
1048             av_log(s->avctx, AV_LOG_ERROR, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1049             return -1;
1050         }
1051
1052         /* skip mb */
1053         s->mb_intra = 0;
1054         for(i=0;i<12;i++)
1055             s->block_last_index[i] = -1;
1056         if(s->picture_structure == PICT_FRAME)
1057             s->mv_type = MV_TYPE_16X16;
1058         else
1059             s->mv_type = MV_TYPE_FIELD;
1060         if (s->pict_type == P_TYPE) {
1061             /* if P type, zero motion vector is implied */
1062             s->mv_dir = MV_DIR_FORWARD;
1063             s->mv[0][0][0] = s->mv[0][0][1] = 0;
1064             s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1065             s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1066             s->field_select[0][0]= s->picture_structure - 1;
1067             s->mb_skiped = 1;
1068             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1069         } else {
1070             /* if B type, reuse previous vectors and directions */
1071             s->mv[0][0][0] = s->last_mv[0][0][0];
1072             s->mv[0][0][1] = s->last_mv[0][0][1];
1073             s->mv[1][0][0] = s->last_mv[1][0][0];
1074             s->mv[1][0][1] = s->last_mv[1][0][1];
1075
1076             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1077                 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
1078 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1079
1080             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1081                 s->mb_skiped = 1;
1082         }
1083
1084         return 0;
1085     }
1086
1087     switch(s->pict_type) {
1088     default:
1089     case I_TYPE:
1090         if (get_bits1(&s->gb) == 0) {
1091             if (get_bits1(&s->gb) == 0){
1092                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1093                 return -1;
1094             }
1095             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1096         } else {
1097             mb_type = MB_TYPE_INTRA;
1098         }
1099         break;
1100     case P_TYPE:
1101         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1102         if (mb_type < 0){
1103             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1104             return -1;
1105         }
1106         mb_type = ptype2mb_type[ mb_type ];
1107         break;
1108     case B_TYPE:
1109         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1110         if (mb_type < 0){
1111             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1112             return -1;
1113         }
1114         mb_type = btype2mb_type[ mb_type ];
1115         break;
1116     }
1117     dprintf("mb_type=%x\n", mb_type);
1118 //    motion_type = 0; /* avoid warning */
1119     if (IS_INTRA(mb_type)) {
1120         /* compute dct type */
1121         if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1122             !s->frame_pred_frame_dct) {
1123             s->interlaced_dct = get_bits1(&s->gb);
1124         }
1125
1126         if (IS_QUANT(mb_type))
1127             s->qscale = get_qscale(s);
1128
1129         if (s->concealment_motion_vectors) {
1130             /* just parse them */
1131             if (s->picture_structure != PICT_FRAME)
1132                 skip_bits1(&s->gb); /* field select */
1133
1134             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1135                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1136             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1137                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1138
1139             skip_bits1(&s->gb); /* marker */
1140         }else
1141             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1142         s->mb_intra = 1;
1143 #ifdef HAVE_XVMC
1144         //one 1 we memcpy blocks in xvmcvideo
1145         if(s->avctx->xvmc_acceleration > 1){
1146             XVMC_pack_pblocks(s,-1);//inter are always full blocks
1147             if(s->swap_uv){
1148                 exchange_uv(s);
1149             }
1150         }
1151 #endif
1152
1153         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1154             for(i=0;i<4+(1<<s->chroma_format);i++) {
1155                 if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1156                     return -1;
1157             }
1158         } else {
1159             for(i=0;i<6;i++) {
1160                 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1161                     return -1;
1162             }
1163         }
1164     } else {
1165         if (mb_type & MB_TYPE_ZERO_MV){
1166             assert(mb_type & MB_TYPE_CBP);
1167
1168             /* compute dct type */
1169             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1170                 !s->frame_pred_frame_dct) {
1171                 s->interlaced_dct = get_bits1(&s->gb);
1172             }
1173
1174             if (IS_QUANT(mb_type))
1175                 s->qscale = get_qscale(s);
1176
1177             s->mv_dir = MV_DIR_FORWARD;
1178             if(s->picture_structure == PICT_FRAME)
1179                 s->mv_type = MV_TYPE_16X16;
1180             else{
1181                 s->mv_type = MV_TYPE_FIELD;
1182                 mb_type |= MB_TYPE_INTERLACED;
1183                 s->field_select[0][0]= s->picture_structure - 1;
1184             }
1185             s->last_mv[0][0][0] = 0;
1186             s->last_mv[0][0][1] = 0;
1187             s->last_mv[0][1][0] = 0;
1188             s->last_mv[0][1][1] = 0;
1189             s->mv[0][0][0] = 0;
1190             s->mv[0][0][1] = 0;
1191         }else{
1192             assert(mb_type & MB_TYPE_L0L1);
1193 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1194             /* get additionnal motion vector type */
1195             if (s->frame_pred_frame_dct)
1196                 motion_type = MT_FRAME;
1197             else{
1198                 motion_type = get_bits(&s->gb, 2);
1199             }
1200
1201             /* compute dct type */
1202             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1203                 !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1204                 s->interlaced_dct = get_bits1(&s->gb);
1205             }
1206
1207             if (IS_QUANT(mb_type))
1208                 s->qscale = get_qscale(s);
1209
1210             /* motion vectors */
1211             s->mv_dir = 0;
1212             for(i=0;i<2;i++) {
1213                 if (USES_LIST(mb_type, i)) {
1214                     s->mv_dir |= (MV_DIR_FORWARD >> i);
1215                     dprintf("motion_type=%d\n", motion_type);
1216                     switch(motion_type) {
1217                     case MT_FRAME: /* or MT_16X8 */
1218                         if (s->picture_structure == PICT_FRAME) {
1219                             /* MT_FRAME */
1220                             mb_type |= MB_TYPE_16x16;
1221                             s->mv_type = MV_TYPE_16X16;
1222                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1223                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1224                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1225                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1226                             /* full_pel: only for mpeg1 */
1227                             if (s->full_pel[i]){
1228                                 s->mv[i][0][0] <<= 1;
1229                                 s->mv[i][0][1] <<= 1;
1230                             }
1231                         } else {
1232                             /* MT_16X8 */
1233                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1234                             s->mv_type = MV_TYPE_16X8;
1235                             for(j=0;j<2;j++) {
1236                                 s->field_select[i][j] = get_bits1(&s->gb);
1237                                 for(k=0;k<2;k++) {
1238                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1239                                                              s->last_mv[i][j][k]);
1240                                     s->last_mv[i][j][k] = val;
1241                                     s->mv[i][j][k] = val;
1242                                 }
1243                             }
1244                         }
1245                         break;
1246                     case MT_FIELD:
1247                         s->mv_type = MV_TYPE_FIELD;
1248                         if (s->picture_structure == PICT_FRAME) {
1249                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1250                             for(j=0;j<2;j++) {
1251                                 s->field_select[i][j] = get_bits1(&s->gb);
1252                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1253                                                          s->last_mv[i][j][0]);
1254                                 s->last_mv[i][j][0] = val;
1255                                 s->mv[i][j][0] = val;
1256                                 dprintf("fmx=%d\n", val);
1257                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1258                                                          s->last_mv[i][j][1] >> 1);
1259                                 s->last_mv[i][j][1] = val << 1;
1260                                 s->mv[i][j][1] = val;
1261                                 dprintf("fmy=%d\n", val);
1262                             }
1263                         } else {
1264                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1265                             s->field_select[i][0] = get_bits1(&s->gb);
1266                             for(k=0;k<2;k++) {
1267                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1268                                                          s->last_mv[i][0][k]);
1269                                 s->last_mv[i][0][k] = val;
1270                                 s->last_mv[i][1][k] = val;
1271                                 s->mv[i][0][k] = val;
1272                             }
1273                         }
1274                         break;
1275                     case MT_DMV:
1276                         {
1277                             int dmx, dmy, mx, my, m;
1278
1279                             mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1280                                                     s->last_mv[i][0][0]);
1281                             s->last_mv[i][0][0] = mx;
1282                             s->last_mv[i][1][0] = mx;
1283                             dmx = get_dmv(s);
1284                             my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1285                                                     s->last_mv[i][0][1] >> 1);
1286                             dmy = get_dmv(s);
1287                             s->mv_type = MV_TYPE_DMV;
1288
1289
1290                             s->last_mv[i][0][1] = my<<1;
1291                             s->last_mv[i][1][1] = my<<1;
1292
1293                             s->mv[i][0][0] = mx;
1294                             s->mv[i][0][1] = my;
1295                             s->mv[i][1][0] = mx;//not used
1296                             s->mv[i][1][1] = my;//not used
1297
1298                             if (s->picture_structure == PICT_FRAME) {
1299                                 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1300
1301                                 //m = 1 + 2 * s->top_field_first;
1302                                 m = s->top_field_first ? 1 : 3;
1303
1304                                 /* top -> top pred */
1305                                 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1306                                 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1307                                 m = 4 - m;
1308                                 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1309                                 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1310                             } else {
1311                                 mb_type |= MB_TYPE_16x16;
1312
1313                                 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1314                                 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1315                                 if(s->picture_structure == PICT_TOP_FIELD)
1316                                     s->mv[i][2][1]--;
1317                                 else
1318                                     s->mv[i][2][1]++;
1319                             }
1320                         }
1321                         break;
1322                     default:
1323                         av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1324                         return -1;
1325                     }
1326                 }
1327             }
1328         }
1329
1330         s->mb_intra = 0;
1331
1332         if (HAS_CBP(mb_type)) {
1333             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1334             if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1335                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1336                 return -1;
1337             }
1338             if(s->chroma_format == 2){//CHROMA422
1339                  cbp|= ( get_bits(&s->gb,2) ) << 6;
1340             }else
1341             if(s->chroma_format >  2){//CHROMA444
1342                  cbp|= ( get_bits(&s->gb,6) ) << 6;
1343             }
1344
1345 #ifdef HAVE_XVMC
1346             //on 1 we memcpy blocks in xvmcvideo
1347             if(s->avctx->xvmc_acceleration > 1){
1348                 XVMC_pack_pblocks(s,cbp);
1349                 if(s->swap_uv){
1350                     exchange_uv(s);
1351                 }
1352             }
1353 #endif
1354
1355             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1356                 for(i=0;i<6;i++) {
1357                     if (cbp & (1<<(5-i)) ) {
1358                         if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1359                             return -1;
1360                     } else {
1361                         s->block_last_index[i] = -1;
1362                     }
1363                 }
1364                 if (s->chroma_format >= 2) {
1365                     if (s->chroma_format == 2) {//CHROMA_422)
1366                         for(i=6;i<8;i++) {
1367                             if (cbp & (1<<(6+7-i)) ) {
1368                                 if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1369                                     return -1;
1370                             } else {
1371                                 s->block_last_index[i] = -1;
1372                             }
1373                         }
1374                     }else{ /*CHROMA_444*/
1375                         for(i=6;i<12;i++) {
1376                             if (cbp & (1<<(6+11-i)) ) {
1377                                 if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1378                                     return -1;
1379                             } else {
1380                                 s->block_last_index[i] = -1;
1381                             }
1382                         }
1383                     }
1384                 }
1385             } else {
1386                 for(i=0;i<6;i++) {
1387                     if (cbp & 32) {
1388                         if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1389                             return -1;
1390                     } else {
1391                         s->block_last_index[i] = -1;
1392                     }
1393                     cbp+=cbp;
1394                 }
1395             }
1396         }else{
1397             for(i=0;i<6;i++)
1398                 s->block_last_index[i] = -1;
1399         }
1400     }
1401
1402     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1403
1404     return 0;
1405 }
1406
1407 /* as h263, but only 17 codes */
1408 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1409 {
1410     int code, sign, val, l, shift;
1411
1412     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1413     if (code == 0) {
1414         return pred;
1415     }
1416     if (code < 0) {
1417         return 0xffff;
1418     }
1419
1420     sign = get_bits1(&s->gb);
1421     shift = fcode - 1;
1422     val = code;
1423     if (shift) {
1424         val = (val - 1) << shift;
1425         val |= get_bits(&s->gb, shift);
1426         val++;
1427     }
1428     if (sign)
1429         val = -val;
1430     val += pred;
1431
1432     /* modulo decoding */
1433     l = 1 << (shift+4);
1434     val = ((val + l)&(l*2-1)) - l;
1435     return val;
1436 }
1437
1438 static inline int decode_dc(GetBitContext *gb, int component)
1439 {
1440     int code, diff;
1441
1442     if (component == 0) {
1443         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1444     } else {
1445         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1446     }
1447     if (code < 0){
1448         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1449         return 0xffff;
1450     }
1451     if (code == 0) {
1452         diff = 0;
1453     } else {
1454         diff = get_xbits(gb, code);
1455     }
1456     return diff;
1457 }
1458
1459 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1460                                DCTELEM *block,
1461                                int n)
1462 {
1463     int level, dc, diff, i, j, run;
1464     int component;
1465     RLTable *rl = &rl_mpeg1;
1466     uint8_t * const scantable= s->intra_scantable.permutated;
1467     const uint16_t *quant_matrix= s->intra_matrix;
1468     const int qscale= s->qscale;
1469
1470     /* DC coef */
1471     component = (n <= 3 ? 0 : n - 4 + 1);
1472     diff = decode_dc(&s->gb, component);
1473     if (diff >= 0xffff)
1474         return -1;
1475     dc = s->last_dc[component];
1476     dc += diff;
1477     s->last_dc[component] = dc;
1478     block[0] = dc<<3;
1479     dprintf("dc=%d diff=%d\n", dc, diff);
1480     i = 0;
1481     {
1482         OPEN_READER(re, &s->gb);
1483         /* now quantify & encode AC coefs */
1484         for(;;) {
1485             UPDATE_CACHE(re, &s->gb);
1486             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1487
1488             if(level == 127){
1489                 break;
1490             } else if(level != 0) {
1491                 i += run;
1492                 j = scantable[i];
1493                 level= (level*qscale*quant_matrix[j])>>4;
1494                 level= (level-1)|1;
1495                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1496                 LAST_SKIP_BITS(re, &s->gb, 1);
1497             } else {
1498                 /* escape */
1499                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1500                 UPDATE_CACHE(re, &s->gb);
1501                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1502                 if (level == -128) {
1503                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1504                 } else if (level == 0) {
1505                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1506                 }
1507                 i += run;
1508                 j = scantable[i];
1509                 if(level<0){
1510                     level= -level;
1511                     level= (level*qscale*quant_matrix[j])>>4;
1512                     level= (level-1)|1;
1513                     level= -level;
1514                 }else{
1515                     level= (level*qscale*quant_matrix[j])>>4;
1516                     level= (level-1)|1;
1517                 }
1518             }
1519             if (i > 63){
1520                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1521                 return -1;
1522             }
1523
1524             block[j] = level;
1525         }
1526         CLOSE_READER(re, &s->gb);
1527     }
1528     s->block_last_index[n] = i;
1529    return 0;
1530 }
1531
1532 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1533                                DCTELEM *block,
1534                                int n)
1535 {
1536     int level, i, j, run;
1537     RLTable *rl = &rl_mpeg1;
1538     uint8_t * const scantable= s->intra_scantable.permutated;
1539     const uint16_t *quant_matrix= s->inter_matrix;
1540     const int qscale= s->qscale;
1541
1542     {
1543         int v;
1544         OPEN_READER(re, &s->gb);
1545         i = -1;
1546         /* special case for the first coef. no need to add a second vlc table */
1547         UPDATE_CACHE(re, &s->gb);
1548         v= SHOW_UBITS(re, &s->gb, 2);
1549         if (v & 2) {
1550             LAST_SKIP_BITS(re, &s->gb, 2);
1551             level= (3*qscale*quant_matrix[0])>>5;
1552             level= (level-1)|1;
1553             if(v&1)
1554                 level= -level;
1555             block[0] = level;
1556             i++;
1557         }
1558
1559         /* now quantify & encode AC coefs */
1560         for(;;) {
1561             UPDATE_CACHE(re, &s->gb);
1562             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1563
1564             if(level == 127){
1565                 break;
1566             } else if(level != 0) {
1567                 i += run;
1568                 j = scantable[i];
1569                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1570                 level= (level-1)|1;
1571                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1572                 LAST_SKIP_BITS(re, &s->gb, 1);
1573             } else {
1574                 /* escape */
1575                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1576                 UPDATE_CACHE(re, &s->gb);
1577                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1578                 if (level == -128) {
1579                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1580                 } else if (level == 0) {
1581                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1582                 }
1583                 i += run;
1584                 j = scantable[i];
1585                 if(level<0){
1586                     level= -level;
1587                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1588                     level= (level-1)|1;
1589                     level= -level;
1590                 }else{
1591                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1592                     level= (level-1)|1;
1593                 }
1594             }
1595             if (i > 63){
1596                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1597                 return -1;
1598             }
1599
1600             block[j] = level;
1601         }
1602         CLOSE_READER(re, &s->gb);
1603     }
1604     s->block_last_index[n] = i;
1605     return 0;
1606 }
1607
1608 /* Also does unquantization here, since I will never support mpeg2
1609    encoding */
1610 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1611                                DCTELEM *block,
1612                                int n)
1613 {
1614     int level, i, j, run;
1615     RLTable *rl = &rl_mpeg1;
1616     uint8_t * const scantable= s->intra_scantable.permutated;
1617     const uint16_t *quant_matrix;
1618     const int qscale= s->qscale;
1619     int mismatch;
1620
1621     mismatch = 1;
1622
1623     {
1624         int v;
1625         OPEN_READER(re, &s->gb);
1626         i = -1;
1627         if (n < 4)
1628             quant_matrix = s->inter_matrix;
1629         else
1630             quant_matrix = s->chroma_inter_matrix;
1631
1632         /* special case for the first coef. no need to add a second vlc table */
1633         UPDATE_CACHE(re, &s->gb);
1634         v= SHOW_UBITS(re, &s->gb, 2);
1635         if (v & 2) {
1636             LAST_SKIP_BITS(re, &s->gb, 2);
1637             level= (3*qscale*quant_matrix[0])>>5;
1638             if(v&1)
1639                 level= -level;
1640             block[0] = level;
1641             mismatch ^= level;
1642             i++;
1643         }
1644
1645         /* now quantify & encode AC coefs */
1646         for(;;) {
1647             UPDATE_CACHE(re, &s->gb);
1648             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1649
1650             if(level == 127){
1651                 break;
1652             } else if(level != 0) {
1653                 i += run;
1654                 j = scantable[i];
1655                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1656                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1657                 LAST_SKIP_BITS(re, &s->gb, 1);
1658             } else {
1659                 /* escape */
1660                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1661                 UPDATE_CACHE(re, &s->gb);
1662                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1663
1664                 i += run;
1665                 j = scantable[i];
1666                 if(level<0){
1667                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1668                     level= -level;
1669                 }else{
1670                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1671                 }
1672             }
1673             if (i > 63){
1674                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1675                 return -1;
1676             }
1677
1678             mismatch ^= level;
1679             block[j] = level;
1680         }
1681         CLOSE_READER(re, &s->gb);
1682     }
1683     block[63] ^= (mismatch & 1);
1684
1685     s->block_last_index[n] = i;
1686     return 0;
1687 }
1688
1689 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1690                                DCTELEM *block,
1691                                int n)
1692 {
1693     int level, dc, diff, i, j, run;
1694     int component;
1695     RLTable *rl;
1696     uint8_t * const scantable= s->intra_scantable.permutated;
1697     const uint16_t *quant_matrix;
1698     const int qscale= s->qscale;
1699     int mismatch;
1700
1701     /* DC coef */
1702     if (n < 4){
1703         quant_matrix = s->intra_matrix;
1704         component = 0;
1705     }else{
1706         quant_matrix = s->chroma_intra_matrix;
1707         component = (n&1) + 1;
1708     }
1709     diff = decode_dc(&s->gb, component);
1710     if (diff >= 0xffff)
1711         return -1;
1712     dc = s->last_dc[component];
1713     dc += diff;
1714     s->last_dc[component] = dc;
1715     block[0] = dc << (3 - s->intra_dc_precision);
1716     dprintf("dc=%d\n", block[0]);
1717     mismatch = block[0] ^ 1;
1718     i = 0;
1719     if (s->intra_vlc_format)
1720         rl = &rl_mpeg2;
1721     else
1722         rl = &rl_mpeg1;
1723
1724     {
1725         OPEN_READER(re, &s->gb);
1726         /* now quantify & encode AC coefs */
1727         for(;;) {
1728             UPDATE_CACHE(re, &s->gb);
1729             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1730
1731             if(level == 127){
1732                 break;
1733             } else if(level != 0) {
1734                 i += run;
1735                 j = scantable[i];
1736                 level= (level*qscale*quant_matrix[j])>>4;
1737                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1738                 LAST_SKIP_BITS(re, &s->gb, 1);
1739             } else {
1740                 /* escape */
1741                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1742                 UPDATE_CACHE(re, &s->gb);
1743                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1744                 i += run;
1745                 j = scantable[i];
1746                 if(level<0){
1747                     level= (-level*qscale*quant_matrix[j])>>4;
1748                     level= -level;
1749                 }else{
1750                     level= (level*qscale*quant_matrix[j])>>4;
1751                 }
1752             }
1753             if (i > 63){
1754                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1755                 return -1;
1756             }
1757
1758             mismatch^= level;
1759             block[j] = level;
1760         }
1761         CLOSE_READER(re, &s->gb);
1762     }
1763     block[63]^= mismatch&1;
1764
1765     s->block_last_index[n] = i;
1766     return 0;
1767 }
1768
1769 typedef struct Mpeg1Context {
1770     MpegEncContext mpeg_enc_ctx;
1771     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1772     int repeat_field; /* true if we must repeat the field */
1773     AVPanScan pan_scan; /** some temporary storage for the panscan */
1774     int slice_count;
1775     int swap_uv;//indicate VCR2
1776     int save_aspect_info;
1777
1778 } Mpeg1Context;
1779
1780 static int mpeg_decode_init(AVCodecContext *avctx)
1781 {
1782     Mpeg1Context *s = avctx->priv_data;
1783     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1784     int i;
1785
1786     //we need some parmutation to store
1787     //matrixes, until MPV_common_init()
1788     //set the real permutatuon
1789     for(i=0;i<64;i++)
1790        s2->dsp.idct_permutation[i]=i;
1791
1792     MPV_decode_defaults(s2);
1793
1794     s->mpeg_enc_ctx.avctx= avctx;
1795     s->mpeg_enc_ctx.flags= avctx->flags;
1796     s->mpeg_enc_ctx.flags2= avctx->flags2;
1797     common_init(&s->mpeg_enc_ctx);
1798     init_vlcs();
1799
1800     s->mpeg_enc_ctx_allocated = 0;
1801     s->mpeg_enc_ctx.picture_number = 0;
1802     s->repeat_field = 0;
1803     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1804     return 0;
1805 }
1806
1807 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1808                                      const uint8_t *new_perm){
1809 uint16_t temp_matrix[64];
1810 int i;
1811
1812     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1813
1814     for(i=0;i<64;i++){
1815         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1816     }
1817 }
1818
1819 //Call this function when we know all parameters
1820 //it may be called in different places for mpeg1 and mpeg2
1821 static int mpeg_decode_postinit(AVCodecContext *avctx){
1822 Mpeg1Context *s1 = avctx->priv_data;
1823 MpegEncContext *s = &s1->mpeg_enc_ctx;
1824 uint8_t old_permutation[64];
1825
1826
1827     if (
1828         (s1->mpeg_enc_ctx_allocated == 0)||
1829         avctx->width  != s->width ||
1830         avctx->height != s->height||
1831 //      s1->save_aspect_info != avctx->aspect_ratio_info||
1832         0)
1833     {
1834
1835         if (s1->mpeg_enc_ctx_allocated) {
1836             MPV_common_end(s);
1837         }
1838
1839         if( (s->width == 0 )||(s->height == 0))
1840             return -2;
1841
1842         avctx->width = s->width;
1843         avctx->height = s->height;
1844         avctx->bit_rate = s->bit_rate;
1845         s1->save_aspect_info = s->aspect_ratio_info;
1846
1847      //low_delay may be forced, in this case we will have B frames
1848      //that behave like P frames
1849         avctx->has_b_frames = !(s->low_delay);
1850
1851         if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1852             //mpeg1 fps
1853             avctx->frame_rate     = frame_rate_tab[s->frame_rate_index].num;
1854             avctx->frame_rate_base= frame_rate_tab[s->frame_rate_index].den;
1855             //mpeg1 aspect
1856             avctx->sample_aspect_ratio= av_d2q(
1857                     1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
1858
1859         }else{//mpeg2
1860         //mpeg2 fps
1861             av_reduce(
1862                 &s->avctx->frame_rate,
1863                 &s->avctx->frame_rate_base,
1864                 frame_rate_tab[s->frame_rate_index].num * (s->frame_rate_ext_n+1),
1865                 frame_rate_tab[s->frame_rate_index].den * (s->frame_rate_ext_d+1),
1866                 1<<30);
1867         //mpeg2 aspect
1868             if(s->aspect_ratio_info > 1){
1869                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
1870                     s->avctx->sample_aspect_ratio=
1871                         av_div_q(
1872                          mpeg2_aspect[s->aspect_ratio_info],
1873                          (AVRational){s->width, s->height}
1874                          );
1875                 }else{
1876                     s->avctx->sample_aspect_ratio=
1877                         av_div_q(
1878                          mpeg2_aspect[s->aspect_ratio_info],
1879                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1880                         );
1881                 }
1882             }else{
1883                 s->avctx->sample_aspect_ratio=
1884                     mpeg2_aspect[s->aspect_ratio_info];
1885             }
1886         }//mpeg2
1887
1888         if(avctx->xvmc_acceleration){
1889             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1890         }else{
1891             if(s->chroma_format <  2){
1892                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
1893             }else
1894             if(s->chroma_format == 2){
1895                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
1896             }else
1897             if(s->chroma_format >  2){
1898                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
1899             }
1900         }
1901         //until then pix_fmt may be changed right after codec init
1902         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1903             if( avctx->idct_algo == FF_IDCT_AUTO )
1904                 avctx->idct_algo = FF_IDCT_SIMPLE;
1905
1906         //quantization matrixes may need reordering
1907         //if dct permutation is changed
1908         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1909
1910         if (MPV_common_init(s) < 0)
1911             return -2;
1912
1913         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1914         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1915         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1916         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1917
1918         s1->mpeg_enc_ctx_allocated = 1;
1919     }
1920     return 0;
1921 }
1922
1923 /* return the 8 bit start code value and update the search
1924    state. Return -1 if no start code found */
1925 static int find_start_code(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1926 {
1927     const uint8_t *buf_ptr= *pbuf_ptr;
1928
1929     buf_ptr++; //gurantees that -1 is within the array
1930     buf_end -= 2; // gurantees that +2 is within the array
1931
1932     while (buf_ptr < buf_end) {
1933         if(*buf_ptr==0){
1934             while(buf_ptr < buf_end && buf_ptr[1]==0)
1935                 buf_ptr++;
1936
1937             if(buf_ptr[-1] == 0 && buf_ptr[1] == 1){
1938                 *pbuf_ptr = buf_ptr+3;
1939                 return buf_ptr[2] + 0x100;
1940             }
1941         }
1942         buf_ptr += 2;
1943     }
1944     buf_end += 2; //undo the hack above
1945
1946     *pbuf_ptr = buf_end;
1947     return -1;
1948 }
1949
1950 static int mpeg1_decode_picture(AVCodecContext *avctx,
1951                                 const uint8_t *buf, int buf_size)
1952 {
1953     Mpeg1Context *s1 = avctx->priv_data;
1954     MpegEncContext *s = &s1->mpeg_enc_ctx;
1955     int ref, f_code, vbv_delay;
1956
1957     if(mpeg_decode_postinit(s->avctx) < 0)
1958        return -2;
1959
1960     init_get_bits(&s->gb, buf, buf_size*8);
1961
1962     ref = get_bits(&s->gb, 10); /* temporal ref */
1963     s->pict_type = get_bits(&s->gb, 3);
1964
1965     vbv_delay= get_bits(&s->gb, 16);
1966     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1967         s->full_pel[0] = get_bits1(&s->gb);
1968         f_code = get_bits(&s->gb, 3);
1969         if (f_code == 0)
1970             return -1;
1971         s->mpeg_f_code[0][0] = f_code;
1972         s->mpeg_f_code[0][1] = f_code;
1973     }
1974     if (s->pict_type == B_TYPE) {
1975         s->full_pel[1] = get_bits1(&s->gb);
1976         f_code = get_bits(&s->gb, 3);
1977         if (f_code == 0)
1978             return -1;
1979         s->mpeg_f_code[1][0] = f_code;
1980         s->mpeg_f_code[1][1] = f_code;
1981     }
1982     s->current_picture.pict_type= s->pict_type;
1983     s->current_picture.key_frame= s->pict_type == I_TYPE;
1984
1985 //    if(avctx->debug & FF_DEBUG_PICT_INFO)
1986 //        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d\n", vbv_delay, ref);
1987
1988     s->y_dc_scale = 8;
1989     s->c_dc_scale = 8;
1990     s->first_slice = 1;
1991     return 0;
1992 }
1993
1994 static void mpeg_decode_sequence_extension(MpegEncContext *s)
1995 {
1996     int horiz_size_ext, vert_size_ext;
1997     int bit_rate_ext;
1998     int level, profile;
1999
2000     skip_bits(&s->gb, 1); /* profil and level esc*/
2001     profile= get_bits(&s->gb, 3);
2002     level= get_bits(&s->gb, 4);
2003     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
2004     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
2005     horiz_size_ext = get_bits(&s->gb, 2);
2006     vert_size_ext = get_bits(&s->gb, 2);
2007     s->width |= (horiz_size_ext << 12);
2008     s->height |= (vert_size_ext << 12);
2009     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
2010     s->bit_rate += (bit_rate_ext << 12) * 400;
2011     skip_bits1(&s->gb); /* marker */
2012     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
2013
2014     s->low_delay = get_bits1(&s->gb);
2015     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2016
2017     s->frame_rate_ext_n = get_bits(&s->gb, 2);
2018     s->frame_rate_ext_d = get_bits(&s->gb, 5);
2019
2020     dprintf("sequence extension\n");
2021     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2022     s->avctx->sub_id = 2; /* indicates mpeg2 found */
2023
2024     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2025         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
2026                profile, level, s->avctx->rc_buffer_size, s->bit_rate);
2027
2028 }
2029
2030 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2031 {
2032     MpegEncContext *s= &s1->mpeg_enc_ctx;
2033     int color_description, w, h;
2034
2035     skip_bits(&s->gb, 3); /* video format */
2036     color_description= get_bits1(&s->gb);
2037     if(color_description){
2038         skip_bits(&s->gb, 8); /* color primaries */
2039         skip_bits(&s->gb, 8); /* transfer_characteristics */
2040         skip_bits(&s->gb, 8); /* matrix_coefficients */
2041     }
2042     w= get_bits(&s->gb, 14);
2043     skip_bits(&s->gb, 1); //marker
2044     h= get_bits(&s->gb, 14);
2045     skip_bits(&s->gb, 1); //marker
2046
2047     s1->pan_scan.width= 16*w;
2048     s1->pan_scan.height=16*h;
2049
2050     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2051         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2052 }
2053
2054 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2055 {
2056     MpegEncContext *s= &s1->mpeg_enc_ctx;
2057     int i,nofco;
2058
2059     nofco = 1;
2060     if(s->progressive_sequence){
2061         if(s->repeat_first_field){
2062             nofco++;
2063             if(s->top_field_first)
2064                 nofco++;
2065         }
2066     }else{
2067         if(s->picture_structure == PICT_FRAME){
2068             nofco++;
2069             if(s->repeat_first_field)
2070                 nofco++;
2071         }
2072     }
2073     for(i=0; i<nofco; i++){
2074         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2075         skip_bits(&s->gb, 1); //marker
2076         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2077         skip_bits(&s->gb, 1); //marker
2078     }
2079
2080     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2081         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
2082             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
2083             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
2084             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2085         );
2086 }
2087
2088 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2089 {
2090     int i, v, j;
2091
2092     dprintf("matrix extension\n");
2093
2094     if (get_bits1(&s->gb)) {
2095         for(i=0;i<64;i++) {
2096             v = get_bits(&s->gb, 8);
2097             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2098             s->intra_matrix[j] = v;
2099             s->chroma_intra_matrix[j] = v;
2100         }
2101     }
2102     if (get_bits1(&s->gb)) {
2103         for(i=0;i<64;i++) {
2104             v = get_bits(&s->gb, 8);
2105             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2106             s->inter_matrix[j] = v;
2107             s->chroma_inter_matrix[j] = v;
2108         }
2109     }
2110     if (get_bits1(&s->gb)) {
2111         for(i=0;i<64;i++) {
2112             v = get_bits(&s->gb, 8);
2113             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2114             s->chroma_intra_matrix[j] = v;
2115         }
2116     }
2117     if (get_bits1(&s->gb)) {
2118         for(i=0;i<64;i++) {
2119             v = get_bits(&s->gb, 8);
2120             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2121             s->chroma_inter_matrix[j] = v;
2122         }
2123     }
2124 }
2125
2126 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2127 {
2128     s->full_pel[0] = s->full_pel[1] = 0;
2129     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2130     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2131     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2132     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2133     s->intra_dc_precision = get_bits(&s->gb, 2);
2134     s->picture_structure = get_bits(&s->gb, 2);
2135     s->top_field_first = get_bits1(&s->gb);
2136     s->frame_pred_frame_dct = get_bits1(&s->gb);
2137     s->concealment_motion_vectors = get_bits1(&s->gb);
2138     s->q_scale_type = get_bits1(&s->gb);
2139     s->intra_vlc_format = get_bits1(&s->gb);
2140     s->alternate_scan = get_bits1(&s->gb);
2141     s->repeat_first_field = get_bits1(&s->gb);
2142     s->chroma_420_type = get_bits1(&s->gb);
2143     s->progressive_frame = get_bits1(&s->gb);
2144
2145     if(s->picture_structure == PICT_FRAME)
2146         s->first_field=0;
2147     else{
2148         s->first_field ^= 1;
2149         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2150     }
2151
2152     if(s->alternate_scan){
2153         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2154         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2155     }else{
2156         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2157         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2158     }
2159
2160     /* composite display not parsed */
2161     dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2162     dprintf("picture_structure=%d\n", s->picture_structure);
2163     dprintf("top field first=%d\n", s->top_field_first);
2164     dprintf("repeat first field=%d\n", s->repeat_first_field);
2165     dprintf("conceal=%d\n", s->concealment_motion_vectors);
2166     dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2167     dprintf("alternate_scan=%d\n", s->alternate_scan);
2168     dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2169     dprintf("progressive_frame=%d\n", s->progressive_frame);
2170 }
2171
2172 static void mpeg_decode_extension(AVCodecContext *avctx,
2173                                   const uint8_t *buf, int buf_size)
2174 {
2175     Mpeg1Context *s1 = avctx->priv_data;
2176     MpegEncContext *s = &s1->mpeg_enc_ctx;
2177     int ext_type;
2178
2179     init_get_bits(&s->gb, buf, buf_size*8);
2180
2181     ext_type = get_bits(&s->gb, 4);
2182     switch(ext_type) {
2183     case 0x1:
2184         mpeg_decode_sequence_extension(s);
2185         break;
2186     case 0x2:
2187         mpeg_decode_sequence_display_extension(s1);
2188         break;
2189     case 0x3:
2190         mpeg_decode_quant_matrix_extension(s);
2191         break;
2192     case 0x7:
2193         mpeg_decode_picture_display_extension(s1);
2194         break;
2195     case 0x8:
2196         mpeg_decode_picture_coding_extension(s);
2197         break;
2198     }
2199 }
2200
2201 static void exchange_uv(MpegEncContext *s){
2202 short * tmp;
2203
2204     tmp = s->pblocks[4];
2205     s->pblocks[4] = s->pblocks[5];
2206     s->pblocks[5] = tmp;
2207 }
2208
2209 static int mpeg_field_start(MpegEncContext *s){
2210     AVCodecContext *avctx= s->avctx;
2211     Mpeg1Context *s1 = (Mpeg1Context*)s;
2212
2213     /* start frame decoding */
2214     if(s->first_field || s->picture_structure==PICT_FRAME){
2215         if(MPV_frame_start(s, avctx) < 0)
2216             return -1;
2217
2218         ff_er_frame_start(s);
2219
2220         /* first check if we must repeat the frame */
2221         s->current_picture_ptr->repeat_pict = 0;
2222         if (s->repeat_first_field) {
2223             if (s->progressive_sequence) {
2224                 if (s->top_field_first)
2225                     s->current_picture_ptr->repeat_pict = 4;
2226                 else
2227                     s->current_picture_ptr->repeat_pict = 2;
2228             } else if (s->progressive_frame) {
2229                 s->current_picture_ptr->repeat_pict = 1;
2230             }
2231         }
2232
2233         *s->current_picture_ptr->pan_scan= s1->pan_scan;
2234     }else{ //second field
2235             int i;
2236
2237             if(!s->current_picture_ptr){
2238                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2239                 return -1;
2240             }
2241
2242             for(i=0; i<4; i++){
2243                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
2244                 if(s->picture_structure == PICT_BOTTOM_FIELD){
2245                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2246                 }
2247             }
2248     }
2249 #ifdef HAVE_XVMC
2250 // MPV_frame_start will call this function too,
2251 // but we need to call it on every field
2252     if(s->avctx->xvmc_acceleration)
2253          XVMC_field_start(s,avctx);
2254 #endif
2255
2256     return 0;
2257 }
2258
2259 #define DECODE_SLICE_ERROR -1
2260 #define DECODE_SLICE_OK 0
2261
2262 /**
2263  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2264  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2265  *         DECODE_SLICE_OK if this slice is ok<br>
2266  */
2267 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2268                              const uint8_t **buf, int buf_size)
2269 {
2270     MpegEncContext *s = &s1->mpeg_enc_ctx;
2271     AVCodecContext *avctx= s->avctx;
2272     int ret;
2273     const int field_pic= s->picture_structure != PICT_FRAME;
2274
2275     s->resync_mb_x=
2276     s->resync_mb_y= -1;
2277
2278     if (mb_y<<field_pic >= s->mb_height){
2279         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2280         return -1;
2281     }
2282
2283     init_get_bits(&s->gb, *buf, buf_size*8);
2284
2285     ff_mpeg1_clean_buffers(s);
2286     s->interlaced_dct = 0;
2287
2288     s->qscale = get_qscale(s);
2289
2290     if(s->qscale == 0){
2291         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2292         return -1;
2293     }
2294
2295     /* extra slice info */
2296     while (get_bits1(&s->gb) != 0) {
2297         skip_bits(&s->gb, 8);
2298     }
2299
2300     s->mb_x=0;
2301
2302     for(;;) {
2303         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2304         if (code < 0){
2305             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2306             return -1;
2307         }
2308         if (code >= 33) {
2309             if (code == 33) {
2310                 s->mb_x += 33;
2311             }
2312             /* otherwise, stuffing, nothing to do */
2313         } else {
2314             s->mb_x += code;
2315             break;
2316         }
2317     }
2318
2319     s->resync_mb_x= s->mb_x;
2320     s->resync_mb_y= s->mb_y= mb_y;
2321     s->mb_skip_run= 0;
2322     ff_init_block_index(s);
2323
2324     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2325         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2326              av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
2327                  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],
2328                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
2329                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
2330                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2331                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2332         }
2333     }
2334
2335     for(;;) {
2336 #ifdef HAVE_XVMC
2337         //one 1 we memcpy blocks in xvmcvideo
2338         if(s->avctx->xvmc_acceleration > 1)
2339             XVMC_init_block(s);//set s->block
2340 #endif
2341
2342         s->dsp.clear_blocks(s->block[0]);
2343
2344         ret = mpeg_decode_mb(s, s->block);
2345         s->chroma_qscale= s->qscale;
2346
2347         dprintf("ret=%d\n", ret);
2348         if (ret < 0)
2349             return -1;
2350
2351         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2352             const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2353             int xy = s->mb_x*2 + s->mb_y*2*wrap;
2354             int motion_x, motion_y, dir, i;
2355             if(field_pic && !s->first_field)
2356                 xy += wrap/2;
2357
2358             for(i=0; i<2; i++){
2359                 for(dir=0; dir<2; dir++){
2360                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2361                         motion_x = motion_y = 0;
2362                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2363                         motion_x = s->mv[dir][0][0];
2364                         motion_y = s->mv[dir][0][1];
2365                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2366                         motion_x = s->mv[dir][i][0];
2367                         motion_y = s->mv[dir][i][1];
2368                     }
2369
2370                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2371                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2372                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2373                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2374                     s->current_picture.ref_index [dir][xy    ]=
2375                     s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2376                 }
2377                 xy += wrap;
2378             }
2379         }
2380
2381         s->dest[0] += 16;
2382         s->dest[1] += 8;
2383         s->dest[2] += 8;
2384
2385         MPV_decode_mb(s, s->block);
2386
2387         if (++s->mb_x >= s->mb_width) {
2388
2389             ff_draw_horiz_band(s, 16*s->mb_y, 16);
2390
2391             s->mb_x = 0;
2392             s->mb_y++;
2393
2394             if(s->mb_y<<field_pic >= s->mb_height){
2395                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2396
2397                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2398                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2399                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d\n", left);
2400                     return -1;
2401                 }else
2402                     goto eos;
2403             }
2404
2405             ff_init_block_index(s);
2406         }
2407
2408         /* skip mb handling */
2409         if (s->mb_skip_run == -1) {
2410             /* read again increment */
2411             s->mb_skip_run = 0;
2412             for(;;) {
2413                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2414                 if (code < 0){
2415                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2416                     return -1;
2417                 }
2418                 if (code >= 33) {
2419                     if (code == 33) {
2420                         s->mb_skip_run += 33;
2421                     }else if(code == 35){
2422                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2423                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2424                             return -1;
2425                         }
2426                         goto eos; /* end of slice */
2427                     }
2428                     /* otherwise, stuffing, nothing to do */
2429                 } else {
2430                     s->mb_skip_run += code;
2431                     break;
2432                 }
2433             }
2434         }
2435     }
2436 eos: // end of slice
2437     *buf += get_bits_count(&s->gb)/8 - 1;
2438 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2439     return 0;
2440 }
2441
2442 static int slice_decode_thread(AVCodecContext *c, void *arg){
2443     MpegEncContext *s= arg;
2444     const uint8_t *buf= s->gb.buffer;
2445     int mb_y= s->start_mb_y;
2446
2447     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2448
2449     for(;;){
2450         int start_code, ret;
2451
2452         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2453         emms_c();
2454 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2455 //ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count);
2456         if(ret < 0){
2457             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2458                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
2459         }else{
2460             ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
2461         }
2462
2463         if(s->mb_y == s->end_mb_y)
2464             return 0;
2465
2466         start_code = find_start_code(&buf, s->gb.buffer_end);
2467         mb_y= start_code - SLICE_MIN_START_CODE;
2468         if(mb_y < 0 || mb_y >= s->end_mb_y)
2469             return -1;
2470     }
2471
2472     return 0; //not reached
2473 }
2474
2475 /**
2476  * handles slice ends.
2477  * @return 1 if it seems to be the last slice of
2478  */
2479 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2480 {
2481     Mpeg1Context *s1 = avctx->priv_data;
2482     MpegEncContext *s = &s1->mpeg_enc_ctx;
2483
2484     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2485         return 0;
2486
2487 #ifdef HAVE_XVMC
2488     if(s->avctx->xvmc_acceleration)
2489         XVMC_field_end(s);
2490 #endif
2491     /* end of slice reached */
2492     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2493         /* end of image */
2494
2495         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2496
2497         ff_er_frame_end(s);
2498
2499         MPV_frame_end(s);
2500
2501         if (s->pict_type == B_TYPE || s->low_delay) {
2502             *pict= *(AVFrame*)s->current_picture_ptr;
2503             ff_print_debug_info(s, pict);
2504         } else {
2505             s->picture_number++;
2506             /* latency of 1 frame for I and P frames */
2507             /* XXX: use another variable than picture_number */
2508             if (s->last_picture_ptr != NULL) {
2509                 *pict= *(AVFrame*)s->last_picture_ptr;
2510                  ff_print_debug_info(s, pict);
2511             }
2512         }
2513
2514         return 1;
2515     } else {
2516         return 0;
2517     }
2518 }
2519
2520 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2521                                  const uint8_t *buf, int buf_size)
2522 {
2523     Mpeg1Context *s1 = avctx->priv_data;
2524     MpegEncContext *s = &s1->mpeg_enc_ctx;
2525     int width,height;
2526     int i, v, j;
2527
2528     init_get_bits(&s->gb, buf, buf_size*8);
2529
2530     width = get_bits(&s->gb, 12);
2531     height = get_bits(&s->gb, 12);
2532     if (width <= 0 || height <= 0 ||
2533         (width % 2) != 0 || (height % 2) != 0)
2534         return -1;
2535     s->aspect_ratio_info= get_bits(&s->gb, 4);
2536     if (s->aspect_ratio_info == 0)
2537         return -1;
2538     s->frame_rate_index = get_bits(&s->gb, 4);
2539     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2540         return -1;
2541     s->bit_rate = get_bits(&s->gb, 18) * 400;
2542     if (get_bits1(&s->gb) == 0) /* marker */
2543         return -1;
2544     s->width = width;
2545     s->height = height;
2546
2547     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2548     skip_bits(&s->gb, 1);
2549
2550     /* get matrix */
2551     if (get_bits1(&s->gb)) {
2552         for(i=0;i<64;i++) {
2553             v = get_bits(&s->gb, 8);
2554             if(v==0){
2555                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2556                 return -1;
2557             }
2558             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2559             s->intra_matrix[j] = v;
2560             s->chroma_intra_matrix[j] = v;
2561         }
2562 #ifdef DEBUG
2563         dprintf("intra matrix present\n");
2564         for(i=0;i<64;i++)
2565             dprintf(" %d", s->intra_matrix[s->dsp.idct_permutation[i]);
2566         printf("\n");
2567 #endif
2568     } else {
2569         for(i=0;i<64;i++) {
2570             j = s->dsp.idct_permutation[i];
2571             v = ff_mpeg1_default_intra_matrix[i];
2572             s->intra_matrix[j] = v;
2573             s->chroma_intra_matrix[j] = v;
2574         }
2575     }
2576     if (get_bits1(&s->gb)) {
2577         for(i=0;i<64;i++) {
2578             v = get_bits(&s->gb, 8);
2579             if(v==0){
2580                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2581                 return -1;
2582             }
2583             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2584             s->inter_matrix[j] = v;
2585             s->chroma_inter_matrix[j] = v;
2586         }
2587 #ifdef DEBUG
2588         dprintf("non intra matrix present\n");
2589         for(i=0;i<64;i++)
2590             dprintf(" %d", s->inter_matrix[s->dsp.idct_permutation[i]);
2591         printf("\n");
2592 #endif
2593     } else {
2594         for(i=0;i<64;i++) {
2595             int j= s->dsp.idct_permutation[i];
2596             v = ff_mpeg1_default_non_intra_matrix[i];
2597             s->inter_matrix[j] = v;
2598             s->chroma_inter_matrix[j] = v;
2599         }
2600     }
2601
2602     if(show_bits(&s->gb, 23) != 0){
2603         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2604         return -1;
2605     }
2606
2607     /* we set mpeg2 parameters so that it emulates mpeg1 */
2608     s->progressive_sequence = 1;
2609     s->progressive_frame = 1;
2610     s->picture_structure = PICT_FRAME;
2611     s->frame_pred_frame_dct = 1;
2612     s->chroma_format = 1;
2613     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2614     avctx->sub_id = 1; /* indicates mpeg1 */
2615     s->out_format = FMT_MPEG1;
2616     s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2617     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2618
2619     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2620         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2621                s->avctx->rc_buffer_size, s->bit_rate);
2622
2623     return 0;
2624 }
2625
2626 static int vcr2_init_sequence(AVCodecContext *avctx)
2627 {
2628     Mpeg1Context *s1 = avctx->priv_data;
2629     MpegEncContext *s = &s1->mpeg_enc_ctx;
2630     int i, v;
2631
2632     /* start new mpeg1 context decoding */
2633     s->out_format = FMT_MPEG1;
2634     if (s1->mpeg_enc_ctx_allocated) {
2635         MPV_common_end(s);
2636     }
2637     s->width = avctx->width;
2638     s->height = avctx->height;
2639     avctx->has_b_frames= 0; //true?
2640     s->low_delay= 1;
2641
2642     if(avctx->xvmc_acceleration){
2643         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2644     }else{
2645         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2646     }
2647
2648     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2649         if( avctx->idct_algo == FF_IDCT_AUTO )
2650             avctx->idct_algo = FF_IDCT_SIMPLE;
2651
2652     if (MPV_common_init(s) < 0)
2653         return -1;
2654     exchange_uv(s);//common init reset pblocks, so we swap them here
2655     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2656     s1->mpeg_enc_ctx_allocated = 1;
2657
2658     for(i=0;i<64;i++) {
2659         int j= s->dsp.idct_permutation[i];
2660         v = ff_mpeg1_default_intra_matrix[i];
2661         s->intra_matrix[j] = v;
2662         s->chroma_intra_matrix[j] = v;
2663
2664         v = ff_mpeg1_default_non_intra_matrix[i];
2665         s->inter_matrix[j] = v;
2666         s->chroma_inter_matrix[j] = v;
2667     }
2668
2669     s->progressive_sequence = 1;
2670     s->progressive_frame = 1;
2671     s->picture_structure = PICT_FRAME;
2672     s->frame_pred_frame_dct = 1;
2673     s->chroma_format = 1;
2674     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2675     avctx->sub_id = 2; /* indicates mpeg2 */
2676     return 0;
2677 }
2678
2679
2680 static void mpeg_decode_user_data(AVCodecContext *avctx,
2681                                   const uint8_t *buf, int buf_size)
2682 {
2683     const uint8_t *p;
2684     int len, flags;
2685     p = buf;
2686     len = buf_size;
2687
2688     /* we parse the DTG active format information */
2689     if (len >= 5 &&
2690         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2691         flags = p[4];
2692         p += 5;
2693         len -= 5;
2694         if (flags & 0x80) {
2695             /* skip event id */
2696             if (len < 2)
2697                 return;
2698             p += 2;
2699             len -= 2;
2700         }
2701         if (flags & 0x40) {
2702             if (len < 1)
2703                 return;
2704             avctx->dtg_active_format = p[0] & 0x0f;
2705         }
2706     }
2707 }
2708
2709 static void mpeg_decode_gop(AVCodecContext *avctx,
2710                             const uint8_t *buf, int buf_size){
2711     Mpeg1Context *s1 = avctx->priv_data;
2712     MpegEncContext *s = &s1->mpeg_enc_ctx;
2713
2714     int drop_frame_flag;
2715     int time_code_hours, time_code_minutes;
2716     int time_code_seconds, time_code_pictures;
2717     int broken_link;
2718
2719     init_get_bits(&s->gb, buf, buf_size*8);
2720
2721     drop_frame_flag = get_bits1(&s->gb);
2722
2723     time_code_hours=get_bits(&s->gb,5);
2724     time_code_minutes = get_bits(&s->gb,6);
2725     skip_bits1(&s->gb);//marker bit
2726     time_code_seconds = get_bits(&s->gb,6);
2727     time_code_pictures = get_bits(&s->gb,6);
2728
2729     /*broken_link indicate that after editing the
2730       reference frames of the first B-Frames after GOP I-Frame
2731       are missing (open gop)*/
2732     broken_link = get_bits1(&s->gb);
2733
2734     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2735         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2736             time_code_hours, time_code_minutes, time_code_seconds,
2737             time_code_pictures, broken_link);
2738 }
2739 /**
2740  * finds the end of the current frame in the bitstream.
2741  * @return the position of the first byte of the next frame, or -1
2742  */
2743 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2744 {
2745     int i;
2746     uint32_t state;
2747
2748     state= pc->state;
2749
2750     i=0;
2751     if(!pc->frame_start_found){
2752         for(i=0; i<buf_size; i++){
2753             state= (state<<8) | buf[i];
2754             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2755                 i++;
2756                 pc->frame_start_found=1;
2757                 break;
2758             }
2759         }
2760     }
2761
2762     if(pc->frame_start_found){
2763         /* EOF considered as end of frame */
2764         if (buf_size == 0)
2765             return 0;
2766         for(; i<buf_size; i++){
2767             state= (state<<8) | buf[i];
2768             if((state&0xFFFFFF00) == 0x100){
2769                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2770                     pc->frame_start_found=0;
2771                     pc->state=-1;
2772                     return i-3;
2773                 }
2774             }
2775         }
2776     }
2777     pc->state= state;
2778     return END_NOT_FOUND;
2779 }
2780
2781 /* handle buffering and image synchronisation */
2782 static int mpeg_decode_frame(AVCodecContext *avctx,
2783                              void *data, int *data_size,
2784                              uint8_t *buf, int buf_size)
2785 {
2786     Mpeg1Context *s = avctx->priv_data;
2787     const uint8_t *buf_end;
2788     const uint8_t *buf_ptr;
2789     int ret, start_code, input_size;
2790     AVFrame *picture = data;
2791     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2792     dprintf("fill_buffer\n");
2793
2794     *data_size = 0;
2795
2796     /* special case for last picture */
2797     if (buf_size == 0 && s2->low_delay==0 && s2->next_picture_ptr) {
2798         *picture= *(AVFrame*)s2->next_picture_ptr;
2799         s2->next_picture_ptr= NULL;
2800
2801         *data_size = sizeof(AVFrame);
2802         return 0;
2803     }
2804
2805     if(s2->flags&CODEC_FLAG_TRUNCATED){
2806         int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2807
2808         if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 )
2809             return buf_size;
2810     }
2811
2812     buf_ptr = buf;
2813     buf_end = buf + buf_size;
2814
2815 #if 0
2816     if (s->repeat_field % 2 == 1) {
2817         s->repeat_field++;
2818         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2819         //        s2->picture_number, s->repeat_field);
2820         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2821             *data_size = sizeof(AVPicture);
2822             goto the_end;
2823         }
2824     }
2825 #endif
2826
2827     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2828         vcr2_init_sequence(avctx);
2829
2830     s->slice_count= 0;
2831
2832     for(;;) {
2833         /* find start next code */
2834         start_code = find_start_code(&buf_ptr, buf_end);
2835         if (start_code < 0){
2836             if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
2837                 if(avctx->thread_count > 1){
2838                     int i;
2839
2840                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2841                     for(i=0; i<s->slice_count; i++)
2842                         s2->error_count += s2->thread_context[i]->error_count;
2843                 }
2844                 if (slice_end(avctx, picture)) {
2845                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2846                         *data_size = sizeof(AVPicture);
2847                 }
2848             }
2849             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2850         }
2851
2852         input_size = buf_end - buf_ptr;
2853
2854         if(avctx->debug & FF_DEBUG_STARTCODE){
2855             av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
2856         }
2857
2858                 /* prepare data for next start code */
2859                 switch(start_code) {
2860                 case SEQ_START_CODE:
2861                     mpeg1_decode_sequence(avctx, buf_ptr,
2862                                           input_size);
2863                     break;
2864
2865                 case PICTURE_START_CODE:
2866                     /* we have a complete image : we try to decompress it */
2867                     mpeg1_decode_picture(avctx,
2868                                          buf_ptr, input_size);
2869                     break;
2870                 case EXT_START_CODE:
2871                     mpeg_decode_extension(avctx,
2872                                           buf_ptr, input_size);
2873                     break;
2874                 case USER_START_CODE:
2875                     mpeg_decode_user_data(avctx,
2876                                           buf_ptr, input_size);
2877                     break;
2878                 case GOP_START_CODE:
2879                     s2->first_field=0;
2880                     mpeg_decode_gop(avctx,
2881                                           buf_ptr, input_size);
2882                     break;
2883                 default:
2884                     if (start_code >= SLICE_MIN_START_CODE &&
2885                         start_code <= SLICE_MAX_START_CODE) {
2886                         int mb_y= start_code - SLICE_MIN_START_CODE;
2887
2888                         /* skip b frames if we dont have reference frames */
2889                         if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2890                         /* skip b frames if we are in a hurry */
2891                         if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2892                         /* skip everything if we are in a hurry>=5 */
2893                         if(avctx->hurry_up>=5) break;
2894
2895                         if (!s->mpeg_enc_ctx_allocated) break;
2896
2897                         if(s2->first_slice){
2898                             s2->first_slice=0;
2899                             if(mpeg_field_start(s2) < 0)
2900                                 return -1;
2901                         }
2902
2903                         if(avctx->thread_count > 1){
2904                             int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2905                             if(threshold <= mb_y){
2906                                 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2907
2908                                 thread_context->start_mb_y= mb_y;
2909                                 thread_context->end_mb_y  = s2->mb_height;
2910                                 if(s->slice_count){
2911                                     s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2912                                     ff_update_duplicate_context(thread_context, s2);
2913                                 }
2914                                 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2915                                 s->slice_count++;
2916                             }
2917                             buf_ptr += 2; //FIXME add minimum num of bytes per slice
2918                         }else{
2919                             ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2920                             emms_c();
2921
2922                             if(ret < 0){
2923                                 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2924                                     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);
2925                             }else{
2926                                 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);
2927                             }
2928                         }
2929                     }
2930                     break;
2931                 }
2932     }
2933 }
2934
2935 static int mpeg_decode_end(AVCodecContext *avctx)
2936 {
2937     Mpeg1Context *s = avctx->priv_data;
2938
2939     if (s->mpeg_enc_ctx_allocated)
2940         MPV_common_end(&s->mpeg_enc_ctx);
2941     return 0;
2942 }
2943
2944 AVCodec mpeg1video_decoder = {
2945     "mpeg1video",
2946     CODEC_TYPE_VIDEO,
2947     CODEC_ID_MPEG1VIDEO,
2948     sizeof(Mpeg1Context),
2949     mpeg_decode_init,
2950     NULL,
2951     mpeg_decode_end,
2952     mpeg_decode_frame,
2953     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2954     .flush= ff_mpeg_flush,
2955 };
2956
2957 AVCodec mpeg2video_decoder = {
2958     "mpeg2video",
2959     CODEC_TYPE_VIDEO,
2960     CODEC_ID_MPEG2VIDEO,
2961     sizeof(Mpeg1Context),
2962     mpeg_decode_init,
2963     NULL,
2964     mpeg_decode_end,
2965     mpeg_decode_frame,
2966     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2967     .flush= ff_mpeg_flush,
2968 };
2969
2970 //legacy decoder
2971 AVCodec mpegvideo_decoder = {
2972     "mpegvideo",
2973     CODEC_TYPE_VIDEO,
2974     CODEC_ID_MPEG2VIDEO,
2975     sizeof(Mpeg1Context),
2976     mpeg_decode_init,
2977     NULL,
2978     mpeg_decode_end,
2979     mpeg_decode_frame,
2980     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2981     .flush= ff_mpeg_flush,
2982 };
2983
2984 #ifdef CONFIG_ENCODERS
2985
2986 AVCodec mpeg1video_encoder = {
2987     "mpeg1video",
2988     CODEC_TYPE_VIDEO,
2989     CODEC_ID_MPEG1VIDEO,
2990     sizeof(MpegEncContext),
2991     encode_init,
2992     MPV_encode_picture,
2993     MPV_encode_end,
2994     .supported_framerates= frame_rate_tab+1,
2995 };
2996
2997 #ifdef CONFIG_RISKY
2998
2999 AVCodec mpeg2video_encoder = {
3000     "mpeg2video",
3001     CODEC_TYPE_VIDEO,
3002     CODEC_ID_MPEG2VIDEO,
3003     sizeof(MpegEncContext),
3004     encode_init,
3005     MPV_encode_picture,
3006     MPV_encode_end,
3007     .supported_framerates= frame_rate_tab+1,
3008 };
3009 #endif
3010 #endif
3011
3012 #ifdef HAVE_XVMC
3013 static int mpeg_mc_decode_init(AVCodecContext *avctx){
3014     Mpeg1Context *s;
3015
3016     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
3017         return -1;
3018     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
3019         dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
3020     }
3021     mpeg_decode_init(avctx);
3022     s = avctx->priv_data;
3023
3024     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3025     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3026
3027     return 0;
3028 }
3029
3030 AVCodec mpeg_xvmc_decoder = {
3031     "mpegvideo_xvmc",
3032     CODEC_TYPE_VIDEO,
3033     CODEC_ID_MPEG2VIDEO_XVMC,
3034     sizeof(Mpeg1Context),
3035     mpeg_mc_decode_init,
3036     NULL,
3037     mpeg_decode_end,
3038     mpeg_decode_frame,
3039     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL,
3040     .flush= ff_mpeg_flush,
3041 };
3042
3043 #endif
3044
3045 /* this is ugly i know, but the alternative is too make
3046    hundreds of vars global and prefix them with ff_mpeg1_
3047    which is far uglier. */
3048 #include "mdec.c"