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 n, 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     s->y_dc_scale_table=
 362     s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
 363 }
 364
 365 void ff_mpeg1_clean_buffers(MpegEncContext *s){
 366     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
 367     s->last_dc[1] = s->last_dc[0];
 368     s->last_dc[2] = s->last_dc[0];
 369     memset(s->last_mv, 0, sizeof(s->last_mv));
 370 }
 371
 372 #ifdef CONFIG_ENCODERS
 373
 374 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 375     put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 376     put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
 377     put_bits(&s->pb, 1, 0); /* slice extra information */
 378 }
 379
 380 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 381 {
 382     mpeg1_encode_sequence_header(s);
 383
 384     /* mpeg1 picture header */
 385     put_header(s, PICTURE_START_CODE);
 386     /* temporal reference */
 387
 388     // RAL: s->picture_number instead of s->fake_picture_number
 389     put_bits(&s->pb, 10, (s->picture_number -
 390                           s->gop_picture_number) & 0x3ff);
 391     put_bits(&s->pb, 3, s->pict_type);
 392
 393     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 394     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 395
 396     // RAL: Forward f_code also needed for B frames
 397     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
 398         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 399         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 400             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 401         else
 402             put_bits(&s->pb, 3, 7); /* forward_f_code */
 403     }
 404
 405     // RAL: Backward f_code necessary for B frames
 406     if (s->pict_type == B_TYPE) {
 407         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 408         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 409             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 410         else
 411             put_bits(&s->pb, 3, 7); /* backward_f_code */
 412     }
 413
 414     put_bits(&s->pb, 1, 0); /* extra bit picture */
 415
 416     s->frame_pred_frame_dct = 1;
 417     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 418         put_header(s, EXT_START_CODE);
 419         put_bits(&s->pb, 4, 8); //pic ext
 420         if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
 421             put_bits(&s->pb, 4, s->f_code);
 422             put_bits(&s->pb, 4, s->f_code);
 423         }else{
 424             put_bits(&s->pb, 8, 255);
 425         }
 426         if (s->pict_type == B_TYPE) {
 427             put_bits(&s->pb, 4, s->b_code);
 428             put_bits(&s->pb, 4, s->b_code);
 429         }else{
 430             put_bits(&s->pb, 8, 255);
 431         }
 432         put_bits(&s->pb, 2, s->intra_dc_precision);
 433
 434         assert(s->picture_structure == PICT_FRAME);
 435         put_bits(&s->pb, 2, s->picture_structure);
 436         if (s->progressive_sequence) {
 437             put_bits(&s->pb, 1, 0); /* no repeat */
 438         } else {
 439             put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
 440         }
 441         /* XXX: optimize the generation of this flag with entropy
 442            measures */
 443         s->frame_pred_frame_dct = s->progressive_sequence;
 444
 445         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 446         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 447         put_bits(&s->pb, 1, s->q_scale_type);
 448         put_bits(&s->pb, 1, s->intra_vlc_format);
 449         put_bits(&s->pb, 1, s->alternate_scan);
 450         put_bits(&s->pb, 1, s->repeat_first_field);
 451         put_bits(&s->pb, 1, s->chroma_420_type=1);
 452         s->progressive_frame = s->progressive_sequence;
 453         put_bits(&s->pb, 1, s->progressive_frame);
 454         put_bits(&s->pb, 1, 0); //composite_display_flag
 455     }
 456     if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
 457         int i;
 458
 459         put_header(s, USER_START_CODE);
 460         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 461             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 462         }
 463     }
 464
 465     s->mb_y=0;
 466     ff_mpeg1_encode_slice_header(s);
 467 }
 468
 469 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 470                                 int has_mv, int field_motion)
 471 {
 472     put_bits(&s->pb, n, bits);
 473     if (!s->frame_pred_frame_dct) {
 474         if (has_mv)
 475             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 476         put_bits(&s->pb, 1, s->interlaced_dct);
 477     }
 478 }
 479
 480 void mpeg1_encode_mb(MpegEncContext *s,
 481                      DCTELEM block[6][64],
 482                      int motion_x, int motion_y)
 483 {
 484     int i, cbp;
 485     const int mb_x = s->mb_x;
 486     const int mb_y = s->mb_y;
 487     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 488
 489     /* compute cbp */
 490     cbp = 0;
 491     for(i=0;i<6;i++) {
 492         if (s->block_last_index[i] >= 0)
 493             cbp |= 1 << (5 - i);
 494     }
 495
 496     if (cbp == 0 && !first_mb && (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
 497         ((s->pict_type == P_TYPE && s->mv_type == MV_TYPE_16X16 && (motion_x | motion_y) == 0) ||
 498         (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) |
 499         ((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))) {
 500         s->mb_skip_run++;
 501         s->qscale -= s->dquant;
 502         s->skip_count++;
 503         s->misc_bits++;
 504         s->last_bits++;
 505         if(s->pict_type == P_TYPE){
 506             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 507             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 508         }
 509     } else {
 510         if(first_mb){
 511             assert(s->mb_skip_run == 0);
 512             encode_mb_skip_run(s, s->mb_x);
 513         }else{
 514             encode_mb_skip_run(s, s->mb_skip_run);
 515         }
 516
 517         if (s->pict_type == I_TYPE) {
 518             if(s->dquant && cbp){
 519                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 520                 put_bits(&s->pb, 5, s->qscale);
 521             }else{
 522                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 523                 s->qscale -= s->dquant;
 524             }
 525             s->misc_bits+= get_bits_diff(s);
 526             s->i_count++;
 527         } else if (s->mb_intra) {
 528             if(s->dquant && cbp){
 529                 put_mb_modes(s, 6, 0x01, 0, 0);
 530                 put_bits(&s->pb, 5, s->qscale);
 531             }else{
 532                 put_mb_modes(s, 5, 0x03, 0, 0);
 533                 s->qscale -= s->dquant;
 534             }
 535             s->misc_bits+= get_bits_diff(s);
 536             s->i_count++;
 537             memset(s->last_mv, 0, sizeof(s->last_mv));
 538         } else if (s->pict_type == P_TYPE) {
 539             if(s->mv_type == MV_TYPE_16X16){
 540                 if (cbp != 0) {
 541                     if ((motion_x|motion_y) == 0) {
 542                         if(s->dquant){
 543                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 544                             put_bits(&s->pb, 5, s->qscale);
 545                         }else{
 546                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 547                         }
 548                         s->misc_bits+= get_bits_diff(s);
 549                     } else {
 550                         if(s->dquant){
 551                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 552                             put_bits(&s->pb, 5, s->qscale);
 553                         }else{
 554                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 555                         }
 556                         s->misc_bits+= get_bits_diff(s);
 557                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 558                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 559                         s->mv_bits+= get_bits_diff(s);
 560                     }
 561                 } else {
 562                     put_bits(&s->pb, 3, 1); /* motion only */
 563                     if (!s->frame_pred_frame_dct)
 564                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 565                     s->misc_bits+= get_bits_diff(s);
 566                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 567                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 568                     s->qscale -= s->dquant;
 569                     s->mv_bits+= get_bits_diff(s);
 570                 }
 571                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 572                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 573             }else{
 574                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 575
 576                 if (cbp) {
 577                     if(s->dquant){
 578                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 579                         put_bits(&s->pb, 5, s->qscale);
 580                     }else{
 581                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 582                     }
 583                 } else {
 584                     put_bits(&s->pb, 3, 1); /* motion only */
 585                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 586                     s->qscale -= s->dquant;
 587                 }
 588                 s->misc_bits+= get_bits_diff(s);
 589                 for(i=0; i<2; i++){
 590                     put_bits(&s->pb, 1, s->field_select[0][i]);
 591                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 592                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 593                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 594                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 595                 }
 596                 s->mv_bits+= get_bits_diff(s);
 597             }
 598             if(cbp)
 599                 put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
 600             s->f_count++;
 601         } else{
 602             static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
 603
 604             if(s->mv_type == MV_TYPE_16X16){
 605                 if (cbp){    // With coded bloc pattern
 606                     if (s->dquant) {
 607                         if(s->mv_dir == MV_DIR_FORWARD)
 608                             put_mb_modes(s, 6, 3, 1, 0);
 609                         else
 610                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
 611                         put_bits(&s->pb, 5, s->qscale);
 612                     } else {
 613                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
 614                     }
 615                 }else{    // No coded bloc pattern
 616                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
 617                     if (!s->frame_pred_frame_dct)
 618                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 619                     s->qscale -= s->dquant;
 620                 }
 621                 s->misc_bits += get_bits_diff(s);
 622                 if (s->mv_dir&MV_DIR_FORWARD){
 623                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 624                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 625                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 626                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 627                     s->f_count++;
 628                 }
 629                 if (s->mv_dir&MV_DIR_BACKWARD){
 630                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 631                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 632                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 633                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 634                     s->b_count++;
 635                 }
 636             }else{
 637                 assert(s->mv_type == MV_TYPE_FIELD);
 638                 assert(!s->frame_pred_frame_dct);
 639                 if (cbp){    // With coded bloc pattern
 640                     if (s->dquant) {
 641                         if(s->mv_dir == MV_DIR_FORWARD)
 642                             put_mb_modes(s, 6, 3, 1, 1);
 643                         else
 644                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
 645                         put_bits(&s->pb, 5, s->qscale);
 646                     } else {
 647                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
 648                     }
 649                 }else{    // No coded bloc pattern
 650                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
 651                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 652                     s->qscale -= s->dquant;
 653                 }
 654                 s->misc_bits += get_bits_diff(s);
 655                 if (s->mv_dir&MV_DIR_FORWARD){
 656                     for(i=0; i<2; i++){
 657                         put_bits(&s->pb, 1, s->field_select[0][i]);
 658                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 659                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 660                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 661                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 662                     }
 663                     s->f_count++;
 664                 }
 665                 if (s->mv_dir&MV_DIR_BACKWARD){
 666                     for(i=0; i<2; i++){
 667                         put_bits(&s->pb, 1, s->field_select[1][i]);
 668                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 669                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 670                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 671                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 672                     }
 673                     s->b_count++;
 674                 }
 675             }
 676             s->mv_bits += get_bits_diff(s);
 677             if(cbp)
 678                 put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
 679         }
 680         for(i=0;i<6;i++) {
 681             if (cbp & (1 << (5 - i))) {
 682                 mpeg1_encode_block(s, block[i], i);
 683             }
 684         }
 685         s->mb_skip_run = 0;
 686         if(s->mb_intra)
 687             s->i_tex_bits+= get_bits_diff(s);
 688         else
 689             s->p_tex_bits+= get_bits_diff(s);
 690     }
 691 }
 692
 693 // RAL: Parameter added: f_or_b_code
 694 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 695 {
 696     int code, bit_size, l, m, bits, range, sign;
 697
 698     if (val == 0) {
 699         /* zero vector */
 700         code = 0;
 701         put_bits(&s->pb,
 702                  mbMotionVectorTable[0][1],
 703                  mbMotionVectorTable[0][0]);
 704     } else {
 705         bit_size = f_or_b_code - 1;
 706         range = 1 << bit_size;
 707         /* modulo encoding */
 708         l = 16 * range;
 709         m = 2 * l;
 710         if (val < -l) {
 711             val += m;
 712         } else if (val >= l) {
 713             val -= m;
 714         }
 715
 716         if (val >= 0) {
 717             val--;
 718             code = (val >> bit_size) + 1;
 719             bits = val & (range - 1);
 720             sign = 0;
 721         } else {
 722             val = -val;
 723             val--;
 724             code = (val >> bit_size) + 1;
 725             bits = val & (range - 1);
 726             sign = 1;
 727         }
 728
 729         assert(code > 0 && code <= 16);
 730
 731         put_bits(&s->pb,
 732                  mbMotionVectorTable[code][1],
 733                  mbMotionVectorTable[code][0]);
 734
 735         put_bits(&s->pb, 1, sign);
 736         if (bit_size > 0) {
 737             put_bits(&s->pb, bit_size, bits);
 738         }
 739     }
 740 }
 741
 742 void ff_mpeg1_encode_init(MpegEncContext *s)
 743 {
 744     static int done=0;
 745
 746     common_init(s);
 747
 748     if(!done){
 749         int f_code;
 750         int mv;
 751         int i;
 752
 753         done=1;
 754         init_rl(&rl_mpeg1);
 755
 756         for(i=0; i<64; i++)
 757         {
 758                 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
 759                 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
 760         }
 761
 762         init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
 763
 764         /* build unified dc encoding tables */
 765         for(i=-255; i<256; i++)
 766         {
 767                 int adiff, index;
 768                 int bits, code;
 769                 int diff=i;
 770
 771                 adiff = ABS(diff);
 772                 if(diff<0) diff--;
 773                 index = vlc_dc_table[adiff];
 774
 775                 bits= vlc_dc_lum_bits[index] + index;
 776                 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 777                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 778
 779                 bits= vlc_dc_chroma_bits[index] + index;
 780                 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 781                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 782         }
 783
 784         mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
 785
 786         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 787             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 788                 int len;
 789
 790                 if(mv==0) len= mbMotionVectorTable[0][1];
 791                 else{
 792                     int val, bit_size, range, code;
 793
 794                     bit_size = s->f_code - 1;
 795                     range = 1 << bit_size;
 796
 797                     val=mv;
 798                     if (val < 0)
 799                         val = -val;
 800                     val--;
 801                     code = (val >> bit_size) + 1;
 802                     if(code<17){
 803                         len= mbMotionVectorTable[code][1] + 1 + bit_size;
 804                     }else{
 805                         len= mbMotionVectorTable[16][1] + 2 + bit_size;
 806                     }
 807                 }
 808
 809                 mv_penalty[f_code][mv+MAX_MV]= len;
 810             }
 811         }
 812
 813
 814         for(f_code=MAX_FCODE; f_code>0; f_code--){
 815             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 816                 fcode_tab[mv+MAX_MV]= f_code;
 817             }
 818         }
 819     }
 820     s->me.mv_penalty= mv_penalty;
 821     s->fcode_tab= fcode_tab;
 822     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 823         s->min_qcoeff=-255;
 824         s->max_qcoeff= 255;
 825     }else{
 826         s->min_qcoeff=-2047;
 827         s->max_qcoeff= 2047;
 828     }
 829     s->intra_ac_vlc_length=
 830     s->inter_ac_vlc_length=
 831     s->intra_ac_vlc_last_length=
 832     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 833 }
 834
 835 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 836 {
 837     if (component == 0) {
 838         put_bits(
 839             &s->pb,
 840             mpeg1_lum_dc_uni[diff+255]&0xFF,
 841             mpeg1_lum_dc_uni[diff+255]>>8);
 842     } else {
 843         put_bits(
 844             &s->pb,
 845             mpeg1_chr_dc_uni[diff+255]&0xFF,
 846             mpeg1_chr_dc_uni[diff+255]>>8);
 847     }
 848 }
 849
 850 static void mpeg1_encode_block(MpegEncContext *s,
 851                                DCTELEM *block,
 852                                int n)
 853 {
 854     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 855     int code, component;
 856 //    RLTable *rl = &rl_mpeg1;
 857
 858     last_index = s->block_last_index[n];
 859
 860     /* DC coef */
 861     if (s->mb_intra) {
 862         component = (n <= 3 ? 0 : n - 4 + 1);
 863         dc = block[0]; /* overflow is impossible */
 864         diff = dc - s->last_dc[component];
 865         encode_dc(s, diff, component);
 866         s->last_dc[component] = dc;
 867         i = 1;
 868 /*
 869         if (s->intra_vlc_format)
 870             rl = &rl_mpeg2;
 871         else
 872             rl = &rl_mpeg1;
 873 */
 874     } else {
 875         /* encode the first coefficient : needs to be done here because
 876            it is handled slightly differently */
 877         level = block[0];
 878         if (abs(level) == 1) {
 879                 code = ((uint32_t)level >> 31); /* the sign bit */
 880                 put_bits(&s->pb, 2, code | 0x02);
 881                 i = 1;
 882         } else {
 883             i = 0;
 884             last_non_zero = -1;
 885             goto next_coef;
 886         }
 887     }
 888
 889     /* now quantify & encode AC coefs */
 890     last_non_zero = i - 1;
 891
 892     for(;i<=last_index;i++) {
 893         j = s->intra_scantable.permutated[i];
 894         level = block[j];
 895     next_coef:
 896 #if 0
 897         if (level != 0)
 898             dprintf("level[%d]=%d\n", i, level);
 899 #endif
 900         /* encode using VLC */
 901         if (level != 0) {
 902             run = i - last_non_zero - 1;
 903
 904             alevel= level;
 905             MASK_ABS(sign, alevel)
 906             sign&=1;
 907
 908 //            code = get_rl_index(rl, 0, run, alevel);
 909             if (alevel <= mpeg1_max_level[0][run]){
 910                 code= mpeg1_index_run[0][run] + alevel - 1;
 911                 /* store the vlc & sign at once */
 912                 put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
 913             } else {
 914                 /* escape seems to be pretty rare <5% so i dont optimize it */
 915                 put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
 916                 /* escape: only clip in this case */
 917                 put_bits(&s->pb, 6, run);
 918                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 919                     if (alevel < 128) {
 920                         put_bits(&s->pb, 8, level & 0xff);
 921                     } else {
 922                         if (level < 0) {
 923                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 924                         } else {
 925                             put_bits(&s->pb, 16, level & 0xffff);
 926                         }
 927                     }
 928                 }else{
 929                     put_bits(&s->pb, 12, level & 0xfff);
 930                 }
 931             }
 932             last_non_zero = i;
 933         }
 934     }
 935     /* end of block */
 936     put_bits(&s->pb, 2, 0x2);
 937 }
 938 #endif //CONFIG_ENCODERS
 939
 940 /******************************************/
 941 /* decoding */
 942
 943 static VLC dc_lum_vlc;
 944 static VLC dc_chroma_vlc;
 945 static VLC mv_vlc;
 946 static VLC mbincr_vlc;
 947 static VLC mb_ptype_vlc;
 948 static VLC mb_btype_vlc;
 949 static VLC mb_pat_vlc;
 950
 951 static void init_vlcs()
 952 {
 953     static int done = 0;
 954
 955     if (!done) {
 956         done = 1;
 957
 958         init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
 959                  vlc_dc_lum_bits, 1, 1,
 960                  vlc_dc_lum_code, 2, 2);
 961         init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
 962                  vlc_dc_chroma_bits, 1, 1,
 963                  vlc_dc_chroma_code, 2, 2);
 964         init_vlc(&mv_vlc, MV_VLC_BITS, 17,
 965                  &mbMotionVectorTable[0][1], 2, 1,
 966                  &mbMotionVectorTable[0][0], 2, 1);
 967         init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
 968                  &mbAddrIncrTable[0][1], 2, 1,
 969                  &mbAddrIncrTable[0][0], 2, 1);
 970         init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
 971                  &mbPatTable[0][1], 2, 1,
 972                  &mbPatTable[0][0], 2, 1);
 973
 974         init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
 975                  &table_mb_ptype[0][1], 2, 1,
 976                  &table_mb_ptype[0][0], 2, 1);
 977         init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
 978                  &table_mb_btype[0][1], 2, 1,
 979                  &table_mb_btype[0][0], 2, 1);
 980         init_rl(&rl_mpeg1);
 981         init_rl(&rl_mpeg2);
 982
 983         init_2d_vlc_rl(&rl_mpeg1);
 984         init_2d_vlc_rl(&rl_mpeg2);
 985     }
 986 }
 987
 988 static inline int get_dmv(MpegEncContext *s)
 989 {
 990     if(get_bits1(&s->gb))
 991         return 1 - (get_bits1(&s->gb) << 1);
 992     else
 993         return 0;
 994 }
 995
 996 static inline int get_qscale(MpegEncContext *s)
 997 {
 998     int qscale = get_bits(&s->gb, 5);
 999     if (s->q_scale_type) {
1000         return non_linear_qscale[qscale];
1001     } else {
1002         return qscale << 1;
1003     }
1004 }
1005
1006 /* motion type (for mpeg2) */
1007 #define MT_FIELD 1
1008 #define MT_FRAME 2
1009 #define MT_16X8  2
1010 #define MT_DMV   3
1011
1012 static int mpeg_decode_mb(MpegEncContext *s,
1013                           DCTELEM block[12][64])
1014 {
1015     int i, j, k, cbp, val, mb_type, motion_type;
1016
1017     dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1018
1019     assert(s->mb_skiped==0);
1020
1021     if (s->mb_skip_run-- != 0) {
1022         if(s->pict_type == I_TYPE){
1023             av_log(s->avctx, AV_LOG_ERROR, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1024             return -1;
1025         }
1026
1027         /* skip mb */
1028         s->mb_intra = 0;
1029         for(i=0;i<12;i++)
1030             s->block_last_index[i] = -1;
1031         if(s->picture_structure == PICT_FRAME)
1032             s->mv_type = MV_TYPE_16X16;
1033         else
1034             s->mv_type = MV_TYPE_FIELD;
1035         if (s->pict_type == P_TYPE) {
1036             /* if P type, zero motion vector is implied */
1037             s->mv_dir = MV_DIR_FORWARD;
1038             s->mv[0][0][0] = s->mv[0][0][1] = 0;
1039             s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1040             s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1041             s->field_select[0][0]= s->picture_structure - 1;
1042             s->mb_skiped = 1;
1043             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1044         } else {
1045             /* if B type, reuse previous vectors and directions */
1046             s->mv[0][0][0] = s->last_mv[0][0][0];
1047             s->mv[0][0][1] = s->last_mv[0][0][1];
1048             s->mv[1][0][0] = s->last_mv[1][0][0];
1049             s->mv[1][0][1] = s->last_mv[1][0][1];
1050
1051             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1052                 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
1053 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1054
1055             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1056                 s->mb_skiped = 1;
1057         }
1058
1059         return 0;
1060     }
1061
1062     switch(s->pict_type) {
1063     default:
1064     case I_TYPE:
1065         if (get_bits1(&s->gb) == 0) {
1066             if (get_bits1(&s->gb) == 0){
1067                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1068                 return -1;
1069             }
1070             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1071         } else {
1072             mb_type = MB_TYPE_INTRA;
1073         }
1074         break;
1075     case P_TYPE:
1076         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1077         if (mb_type < 0){
1078             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1079             return -1;
1080         }
1081         mb_type = ptype2mb_type[ mb_type ];
1082         break;
1083     case B_TYPE:
1084         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1085         if (mb_type < 0){
1086             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1087             return -1;
1088         }
1089         mb_type = btype2mb_type[ mb_type ];
1090         break;
1091     }
1092     dprintf("mb_type=%x\n", mb_type);
1093 //    motion_type = 0; /* avoid warning */
1094     if (IS_INTRA(mb_type)) {
1095         /* compute dct type */
1096         if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1097             !s->frame_pred_frame_dct) {
1098             s->interlaced_dct = get_bits1(&s->gb);
1099         }
1100
1101         if (IS_QUANT(mb_type))
1102             s->qscale = get_qscale(s);
1103
1104         if (s->concealment_motion_vectors) {
1105             /* just parse them */
1106             if (s->picture_structure != PICT_FRAME)
1107                 skip_bits1(&s->gb); /* field select */
1108
1109             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1110                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1111             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1112                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1113
1114             skip_bits1(&s->gb); /* marker */
1115         }else
1116             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1117         s->mb_intra = 1;
1118 #ifdef HAVE_XVMC
1119         //one 1 we memcpy blocks in xvmcvideo
1120         if(s->avctx->xvmc_acceleration > 1){
1121             XVMC_pack_pblocks(s,-1);//inter are always full blocks
1122             if(s->swap_uv){
1123                 exchange_uv(s);
1124             }
1125         }
1126 #endif
1127
1128         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1129             for(i=0;i<4+(1<<s->chroma_format);i++) {
1130                 if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1131                     return -1;
1132             }
1133         } else {
1134             for(i=0;i<6;i++) {
1135                 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1136                     return -1;
1137             }
1138         }
1139     } else {
1140         if (mb_type & MB_TYPE_ZERO_MV){
1141             assert(mb_type & MB_TYPE_CBP);
1142
1143             /* compute dct type */
1144             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1145                 !s->frame_pred_frame_dct) {
1146                 s->interlaced_dct = get_bits1(&s->gb);
1147             }
1148
1149             if (IS_QUANT(mb_type))
1150                 s->qscale = get_qscale(s);
1151
1152             s->mv_dir = MV_DIR_FORWARD;
1153             if(s->picture_structure == PICT_FRAME)
1154                 s->mv_type = MV_TYPE_16X16;
1155             else{
1156                 s->mv_type = MV_TYPE_FIELD;
1157                 mb_type |= MB_TYPE_INTERLACED;
1158                 s->field_select[0][0]= s->picture_structure - 1;
1159             }
1160             s->last_mv[0][0][0] = 0;
1161             s->last_mv[0][0][1] = 0;
1162             s->last_mv[0][1][0] = 0;
1163             s->last_mv[0][1][1] = 0;
1164             s->mv[0][0][0] = 0;
1165             s->mv[0][0][1] = 0;
1166         }else{
1167             assert(mb_type & MB_TYPE_L0L1);
1168 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1169             /* get additionnal motion vector type */
1170             if (s->frame_pred_frame_dct)
1171                 motion_type = MT_FRAME;
1172             else{
1173                 motion_type = get_bits(&s->gb, 2);
1174             }
1175
1176             /* compute dct type */
1177             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1178                 !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1179                 s->interlaced_dct = get_bits1(&s->gb);
1180             }
1181
1182             if (IS_QUANT(mb_type))
1183                 s->qscale = get_qscale(s);
1184
1185             /* motion vectors */
1186             s->mv_dir = 0;
1187             for(i=0;i<2;i++) {
1188                 if (USES_LIST(mb_type, i)) {
1189                     s->mv_dir |= (MV_DIR_FORWARD >> i);
1190                     dprintf("motion_type=%d\n", motion_type);
1191                     switch(motion_type) {
1192                     case MT_FRAME: /* or MT_16X8 */
1193                         if (s->picture_structure == PICT_FRAME) {
1194                             /* MT_FRAME */
1195                             mb_type |= MB_TYPE_16x16;
1196                             s->mv_type = MV_TYPE_16X16;
1197                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1198                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1199                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1200                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1201                             /* full_pel: only for mpeg1 */
1202                             if (s->full_pel[i]){
1203                                 s->mv[i][0][0] <<= 1;
1204                                 s->mv[i][0][1] <<= 1;
1205                             }
1206                         } else {
1207                             /* MT_16X8 */
1208                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1209                             s->mv_type = MV_TYPE_16X8;
1210                             for(j=0;j<2;j++) {
1211                                 s->field_select[i][j] = get_bits1(&s->gb);
1212                                 for(k=0;k<2;k++) {
1213                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1214                                                              s->last_mv[i][j][k]);
1215                                     s->last_mv[i][j][k] = val;
1216                                     s->mv[i][j][k] = val;
1217                                 }
1218                             }
1219                         }
1220                         break;
1221                     case MT_FIELD:
1222                         s->mv_type = MV_TYPE_FIELD;
1223                         if (s->picture_structure == PICT_FRAME) {
1224                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1225                             for(j=0;j<2;j++) {
1226                                 s->field_select[i][j] = get_bits1(&s->gb);
1227                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1228                                                          s->last_mv[i][j][0]);
1229                                 s->last_mv[i][j][0] = val;
1230                                 s->mv[i][j][0] = val;
1231                                 dprintf("fmx=%d\n", val);
1232                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1233                                                          s->last_mv[i][j][1] >> 1);
1234                                 s->last_mv[i][j][1] = val << 1;
1235                                 s->mv[i][j][1] = val;
1236                                 dprintf("fmy=%d\n", val);
1237                             }
1238                         } else {
1239                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1240                             s->field_select[i][0] = get_bits1(&s->gb);
1241                             for(k=0;k<2;k++) {
1242                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1243                                                          s->last_mv[i][0][k]);
1244                                 s->last_mv[i][0][k] = val;
1245                                 s->last_mv[i][1][k] = val;
1246                                 s->mv[i][0][k] = val;
1247                             }
1248                         }
1249                         break;
1250                     case MT_DMV:
1251                         {
1252                             int dmx, dmy, mx, my, m;
1253
1254                             mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1255                                                     s->last_mv[i][0][0]);
1256                             s->last_mv[i][0][0] = mx;
1257                             s->last_mv[i][1][0] = mx;
1258                             dmx = get_dmv(s);
1259                             my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1260                                                     s->last_mv[i][0][1] >> 1);
1261                             dmy = get_dmv(s);
1262                             s->mv_type = MV_TYPE_DMV;
1263
1264
1265                             s->last_mv[i][0][1] = my<<1;
1266                             s->last_mv[i][1][1] = my<<1;
1267
1268                             s->mv[i][0][0] = mx;
1269                             s->mv[i][0][1] = my;
1270                             s->mv[i][1][0] = mx;//not used
1271                             s->mv[i][1][1] = my;//not used
1272
1273                             if (s->picture_structure == PICT_FRAME) {
1274                                 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1275
1276                                 //m = 1 + 2 * s->top_field_first;
1277                                 m = s->top_field_first ? 1 : 3;
1278
1279                                 /* top -> top pred */
1280                                 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1281                                 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1282                                 m = 4 - m;
1283                                 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1284                                 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1285                             } else {
1286                                 mb_type |= MB_TYPE_16x16;
1287
1288                                 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1289                                 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1290                                 if(s->picture_structure == PICT_TOP_FIELD)
1291                                     s->mv[i][2][1]--;
1292                                 else
1293                                     s->mv[i][2][1]++;
1294                             }
1295                         }
1296                         break;
1297                     default:
1298                         av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1299                         return -1;
1300                     }
1301                 }
1302             }
1303         }
1304
1305         s->mb_intra = 0;
1306
1307         if (HAS_CBP(mb_type)) {
1308             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1309             if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1310                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1311                 return -1;
1312             }
1313             if(s->chroma_format == 2){//CHROMA422
1314                  cbp|= ( get_bits(&s->gb,2) ) << 6;
1315             }else
1316             if(s->chroma_format >  2){//CHROMA444
1317                  cbp|= ( get_bits(&s->gb,6) ) << 6;
1318             }
1319
1320 #ifdef HAVE_XVMC
1321             //on 1 we memcpy blocks in xvmcvideo
1322             if(s->avctx->xvmc_acceleration > 1){
1323                 XVMC_pack_pblocks(s,cbp);
1324                 if(s->swap_uv){
1325                     exchange_uv(s);
1326                 }
1327             }
1328 #endif
1329
1330             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1331                 for(i=0;i<6;i++) {
1332                     if (cbp & (1<<(5-i)) ) {
1333                         if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1334                             return -1;
1335                     } else {
1336                         s->block_last_index[i] = -1;
1337                     }
1338                 }
1339                 if (s->chroma_format >= 2) {
1340                     if (s->chroma_format == 2) {//CHROMA_422)
1341                         for(i=6;i<8;i++) {
1342                             if (cbp & (1<<(6+7-i)) ) {
1343                                 if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1344                                     return -1;
1345                             } else {
1346                                 s->block_last_index[i] = -1;
1347                             }
1348                         }
1349                     }else{ /*CHROMA_444*/
1350                         for(i=6;i<12;i++) {
1351                             if (cbp & (1<<(6+11-i)) ) {
1352                                 if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1353                                     return -1;
1354                             } else {
1355                                 s->block_last_index[i] = -1;
1356                             }
1357                         }
1358                     }
1359                 }
1360             } else {
1361                 for(i=0;i<6;i++) {
1362                     if (cbp & 32) {
1363                         if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1364                             return -1;
1365                     } else {
1366                         s->block_last_index[i] = -1;
1367                     }
1368                     cbp+=cbp;
1369                 }
1370             }
1371         }else{
1372             for(i=0;i<6;i++)
1373                 s->block_last_index[i] = -1;
1374         }
1375     }
1376
1377     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1378
1379     return 0;
1380 }
1381
1382 /* as h263, but only 17 codes */
1383 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1384 {
1385     int code, sign, val, l, shift;
1386
1387     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1388     if (code == 0) {
1389         return pred;
1390     }
1391     if (code < 0) {
1392         return 0xffff;
1393     }
1394
1395     sign = get_bits1(&s->gb);
1396     shift = fcode - 1;
1397     val = code;
1398     if (shift) {
1399         val = (val - 1) << shift;
1400         val |= get_bits(&s->gb, shift);
1401         val++;
1402     }
1403     if (sign)
1404         val = -val;
1405     val += pred;
1406
1407     /* modulo decoding */
1408     l = 1 << (shift+4);
1409     val = ((val + l)&(l*2-1)) - l;
1410     return val;
1411 }
1412
1413 static inline int decode_dc(GetBitContext *gb, int component)
1414 {
1415     int code, diff;
1416
1417     if (component == 0) {
1418         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1419     } else {
1420         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1421     }
1422     if (code < 0){
1423         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1424         return 0xffff;
1425     }
1426     if (code == 0) {
1427         diff = 0;
1428     } else {
1429         diff = get_xbits(gb, code);
1430     }
1431     return diff;
1432 }
1433
1434 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1435                                DCTELEM *block,
1436                                int n)
1437 {
1438     int level, dc, diff, i, j, run;
1439     int component;
1440     RLTable *rl = &rl_mpeg1;
1441     uint8_t * const scantable= s->intra_scantable.permutated;
1442     const uint16_t *quant_matrix= s->intra_matrix;
1443     const int qscale= s->qscale;
1444
1445     /* DC coef */
1446     component = (n <= 3 ? 0 : n - 4 + 1);
1447     diff = decode_dc(&s->gb, component);
1448     if (diff >= 0xffff)
1449         return -1;
1450     dc = s->last_dc[component];
1451     dc += diff;
1452     s->last_dc[component] = dc;
1453     block[0] = dc<<3;
1454     dprintf("dc=%d diff=%d\n", dc, diff);
1455     i = 0;
1456     {
1457         OPEN_READER(re, &s->gb);
1458         /* now quantify & encode AC coefs */
1459         for(;;) {
1460             UPDATE_CACHE(re, &s->gb);
1461             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1462
1463             if(level == 127){
1464                 break;
1465             } else if(level != 0) {
1466                 i += run;
1467                 j = scantable[i];
1468                 level= (level*qscale*quant_matrix[j])>>4;
1469                 level= (level-1)|1;
1470                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1471                 LAST_SKIP_BITS(re, &s->gb, 1);
1472             } else {
1473                 /* escape */
1474                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1475                 UPDATE_CACHE(re, &s->gb);
1476                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1477                 if (level == -128) {
1478                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1479                 } else if (level == 0) {
1480                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1481                 }
1482                 i += run;
1483                 j = scantable[i];
1484                 if(level<0){
1485                     level= -level;
1486                     level= (level*qscale*quant_matrix[j])>>4;
1487                     level= (level-1)|1;
1488                     level= -level;
1489                 }else{
1490                     level= (level*qscale*quant_matrix[j])>>4;
1491                     level= (level-1)|1;
1492                 }
1493             }
1494             if (i > 63){
1495                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1496                 return -1;
1497             }
1498
1499             block[j] = level;
1500         }
1501         CLOSE_READER(re, &s->gb);
1502     }
1503     s->block_last_index[n] = i;
1504    return 0;
1505 }
1506
1507 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1508                                DCTELEM *block,
1509                                int n)
1510 {
1511     int level, i, j, run;
1512     RLTable *rl = &rl_mpeg1;
1513     uint8_t * const scantable= s->intra_scantable.permutated;
1514     const uint16_t *quant_matrix= s->inter_matrix;
1515     const int qscale= s->qscale;
1516
1517     {
1518         int v;
1519         OPEN_READER(re, &s->gb);
1520         i = -1;
1521         /* special case for the first coef. no need to add a second vlc table */
1522         UPDATE_CACHE(re, &s->gb);
1523         v= SHOW_UBITS(re, &s->gb, 2);
1524         if (v & 2) {
1525             LAST_SKIP_BITS(re, &s->gb, 2);
1526             level= (3*qscale*quant_matrix[0])>>5;
1527             level= (level-1)|1;
1528             if(v&1)
1529                 level= -level;
1530             block[0] = level;
1531             i++;
1532         }
1533
1534         /* now quantify & encode AC coefs */
1535         for(;;) {
1536             UPDATE_CACHE(re, &s->gb);
1537             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1538
1539             if(level == 127){
1540                 break;
1541             } else if(level != 0) {
1542                 i += run;
1543                 j = scantable[i];
1544                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1545                 level= (level-1)|1;
1546                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1547                 LAST_SKIP_BITS(re, &s->gb, 1);
1548             } else {
1549                 /* escape */
1550                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1551                 UPDATE_CACHE(re, &s->gb);
1552                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1553                 if (level == -128) {
1554                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1555                 } else if (level == 0) {
1556                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1557                 }
1558                 i += run;
1559                 j = scantable[i];
1560                 if(level<0){
1561                     level= -level;
1562                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1563                     level= (level-1)|1;
1564                     level= -level;
1565                 }else{
1566                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1567                     level= (level-1)|1;
1568                 }
1569             }
1570             if (i > 63){
1571                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1572                 return -1;
1573             }
1574
1575             block[j] = level;
1576         }
1577         CLOSE_READER(re, &s->gb);
1578     }
1579     s->block_last_index[n] = i;
1580     return 0;
1581 }
1582
1583 /* Also does unquantization here, since I will never support mpeg2
1584    encoding */
1585 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1586                                DCTELEM *block,
1587                                int n)
1588 {
1589     int level, i, j, run;
1590     RLTable *rl = &rl_mpeg1;
1591     uint8_t * const scantable= s->intra_scantable.permutated;
1592     const uint16_t *quant_matrix;
1593     const int qscale= s->qscale;
1594     int mismatch;
1595
1596     mismatch = 1;
1597
1598     {
1599         int v;
1600         OPEN_READER(re, &s->gb);
1601         i = -1;
1602         if (n < 4)
1603             quant_matrix = s->inter_matrix;
1604         else
1605             quant_matrix = s->chroma_inter_matrix;
1606
1607         /* special case for the first coef. no need to add a second vlc table */
1608         UPDATE_CACHE(re, &s->gb);
1609         v= SHOW_UBITS(re, &s->gb, 2);
1610         if (v & 2) {
1611             LAST_SKIP_BITS(re, &s->gb, 2);
1612             level= (3*qscale*quant_matrix[0])>>5;
1613             if(v&1)
1614                 level= -level;
1615             block[0] = level;
1616             mismatch ^= level;
1617             i++;
1618         }
1619
1620         /* now quantify & encode AC coefs */
1621         for(;;) {
1622             UPDATE_CACHE(re, &s->gb);
1623             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1624
1625             if(level == 127){
1626                 break;
1627             } else if(level != 0) {
1628                 i += run;
1629                 j = scantable[i];
1630                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1631                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1632                 LAST_SKIP_BITS(re, &s->gb, 1);
1633             } else {
1634                 /* escape */
1635                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1636                 UPDATE_CACHE(re, &s->gb);
1637                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1638
1639                 i += run;
1640                 j = scantable[i];
1641                 if(level<0){
1642                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1643                     level= -level;
1644                 }else{
1645                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1646                 }
1647             }
1648             if (i > 63){
1649                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1650                 return -1;
1651             }
1652
1653             mismatch ^= level;
1654             block[j] = level;
1655         }
1656         CLOSE_READER(re, &s->gb);
1657     }
1658     block[63] ^= (mismatch & 1);
1659
1660     s->block_last_index[n] = i;
1661     return 0;
1662 }
1663
1664 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1665                                DCTELEM *block,
1666                                int n)
1667 {
1668     int level, dc, diff, i, j, run;
1669     int component;
1670     RLTable *rl;
1671     uint8_t * const scantable= s->intra_scantable.permutated;
1672     const uint16_t *quant_matrix;
1673     const int qscale= s->qscale;
1674     int mismatch;
1675
1676     /* DC coef */
1677     if (n < 4){
1678         quant_matrix = s->intra_matrix;
1679         component = 0;
1680     }else{
1681         quant_matrix = s->chroma_intra_matrix;
1682         component = (n&1) + 1;
1683     }
1684     diff = decode_dc(&s->gb, component);
1685     if (diff >= 0xffff)
1686         return -1;
1687     dc = s->last_dc[component];
1688     dc += diff;
1689     s->last_dc[component] = dc;
1690     block[0] = dc << (3 - s->intra_dc_precision);
1691     dprintf("dc=%d\n", block[0]);
1692     mismatch = block[0] ^ 1;
1693     i = 0;
1694     if (s->intra_vlc_format)
1695         rl = &rl_mpeg2;
1696     else
1697         rl = &rl_mpeg1;
1698
1699     {
1700         OPEN_READER(re, &s->gb);
1701         /* now quantify & encode AC coefs */
1702         for(;;) {
1703             UPDATE_CACHE(re, &s->gb);
1704             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1705
1706             if(level == 127){
1707                 break;
1708             } else if(level != 0) {
1709                 i += run;
1710                 j = scantable[i];
1711                 level= (level*qscale*quant_matrix[j])>>4;
1712                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1713                 LAST_SKIP_BITS(re, &s->gb, 1);
1714             } else {
1715                 /* escape */
1716                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1717                 UPDATE_CACHE(re, &s->gb);
1718                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1719                 i += run;
1720                 j = scantable[i];
1721                 if(level<0){
1722                     level= (-level*qscale*quant_matrix[j])>>4;
1723                     level= -level;
1724                 }else{
1725                     level= (level*qscale*quant_matrix[j])>>4;
1726                 }
1727             }
1728             if (i > 63){
1729                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1730                 return -1;
1731             }
1732
1733             mismatch^= level;
1734             block[j] = level;
1735         }
1736         CLOSE_READER(re, &s->gb);
1737     }
1738     block[63]^= mismatch&1;
1739
1740     s->block_last_index[n] = i;
1741     return 0;
1742 }
1743
1744 typedef struct Mpeg1Context {
1745     MpegEncContext mpeg_enc_ctx;
1746     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1747     int repeat_field; /* true if we must repeat the field */
1748     AVPanScan pan_scan; /** some temporary storage for the panscan */
1749     int slice_count;
1750 } Mpeg1Context;
1751
1752 static int mpeg_decode_init(AVCodecContext *avctx)
1753 {
1754     Mpeg1Context *s = avctx->priv_data;
1755
1756     s->mpeg_enc_ctx.avctx= avctx;
1757     s->mpeg_enc_ctx.flags= avctx->flags;
1758     s->mpeg_enc_ctx.flags2= avctx->flags2;
1759     common_init(&s->mpeg_enc_ctx);
1760     init_vlcs();
1761
1762     s->mpeg_enc_ctx_allocated = 0;
1763     s->mpeg_enc_ctx.picture_number = 0;
1764     s->repeat_field = 0;
1765     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1766     return 0;
1767 }
1768
1769 /* return the 8 bit start code value and update the search
1770    state. Return -1 if no start code found */
1771 static int find_start_code(uint8_t **pbuf_ptr, uint8_t *buf_end)
1772 {
1773     uint8_t *buf_ptr;
1774     unsigned int state=0xFFFFFFFF, v;
1775     int val;
1776
1777     buf_ptr = *pbuf_ptr;
1778     while (buf_ptr < buf_end) {
1779         v = *buf_ptr++;
1780         if (state == 0x000001) {
1781             state = ((state << 8) | v) & 0xffffff;
1782             val = state;
1783             goto found;
1784         }
1785         state = ((state << 8) | v) & 0xffffff;
1786     }
1787     val = -1;
1788  found:
1789     *pbuf_ptr = buf_ptr;
1790     return val;
1791 }
1792
1793 static int mpeg1_decode_picture(AVCodecContext *avctx,
1794                                 uint8_t *buf, int buf_size)
1795 {
1796     Mpeg1Context *s1 = avctx->priv_data;
1797     MpegEncContext *s = &s1->mpeg_enc_ctx;
1798     int ref, f_code, vbv_delay;
1799
1800     init_get_bits(&s->gb, buf, buf_size*8);
1801
1802     ref = get_bits(&s->gb, 10); /* temporal ref */
1803     s->pict_type = get_bits(&s->gb, 3);
1804
1805     vbv_delay= get_bits(&s->gb, 16);
1806     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1807         s->full_pel[0] = get_bits1(&s->gb);
1808         f_code = get_bits(&s->gb, 3);
1809         if (f_code == 0)
1810             return -1;
1811         s->mpeg_f_code[0][0] = f_code;
1812         s->mpeg_f_code[0][1] = f_code;
1813     }
1814     if (s->pict_type == B_TYPE) {
1815         s->full_pel[1] = get_bits1(&s->gb);
1816         f_code = get_bits(&s->gb, 3);
1817         if (f_code == 0)
1818             return -1;
1819         s->mpeg_f_code[1][0] = f_code;
1820         s->mpeg_f_code[1][1] = f_code;
1821     }
1822     s->current_picture.pict_type= s->pict_type;
1823     s->current_picture.key_frame= s->pict_type == I_TYPE;
1824
1825 //    if(avctx->debug & FF_DEBUG_PICT_INFO)
1826 //        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d\n", vbv_delay, ref);
1827
1828     s->y_dc_scale = 8;
1829     s->c_dc_scale = 8;
1830     s->first_slice = 1;
1831     return 0;
1832 }
1833
1834 static void mpeg_decode_sequence_extension(MpegEncContext *s)
1835 {
1836     int horiz_size_ext, vert_size_ext;
1837     int bit_rate_ext;
1838     int frame_rate_ext_n, frame_rate_ext_d;
1839     int level, profile;
1840
1841     skip_bits(&s->gb, 1); /* profil and level esc*/
1842     profile= get_bits(&s->gb, 3);
1843     level= get_bits(&s->gb, 4);
1844     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1845     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1846     horiz_size_ext = get_bits(&s->gb, 2);
1847     vert_size_ext = get_bits(&s->gb, 2);
1848     s->width |= (horiz_size_ext << 12);
1849     s->height |= (vert_size_ext << 12);
1850     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1851     s->bit_rate += (bit_rate_ext << 12) * 400;
1852     skip_bits1(&s->gb); /* marker */
1853     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1854
1855     s->low_delay = get_bits1(&s->gb);
1856     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1857
1858     frame_rate_ext_n = get_bits(&s->gb, 2);
1859     frame_rate_ext_d = get_bits(&s->gb, 5);
1860     av_reduce(
1861         &s->avctx->frame_rate,
1862         &s->avctx->frame_rate_base,
1863         frame_rate_tab[s->frame_rate_index].num * (frame_rate_ext_n+1),
1864         frame_rate_tab[s->frame_rate_index].den * (frame_rate_ext_d+1),
1865         1<<30);
1866
1867     dprintf("sequence extension\n");
1868     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1869     s->avctx->sub_id = 2; /* indicates mpeg2 found */
1870
1871     if(s->aspect_ratio_info <= 1)
1872         s->avctx->sample_aspect_ratio= mpeg2_aspect[s->aspect_ratio_info];
1873     else{
1874         s->avctx->sample_aspect_ratio=
1875             av_div_q(
1876                 mpeg2_aspect[s->aspect_ratio_info],
1877                 (AVRational){s->width, s->height}
1878             );
1879     }
1880
1881     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1882         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1883                profile, level, s->avctx->rc_buffer_size, s->bit_rate);
1884 }
1885
1886 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1887 {
1888     MpegEncContext *s= &s1->mpeg_enc_ctx;
1889     int color_description, w, h;
1890
1891     skip_bits(&s->gb, 3); /* video format */
1892     color_description= get_bits1(&s->gb);
1893     if(color_description){
1894         skip_bits(&s->gb, 8); /* color primaries */
1895         skip_bits(&s->gb, 8); /* transfer_characteristics */
1896         skip_bits(&s->gb, 8); /* matrix_coefficients */
1897     }
1898     w= get_bits(&s->gb, 14);
1899     skip_bits(&s->gb, 1); //marker
1900     h= get_bits(&s->gb, 14);
1901     skip_bits(&s->gb, 1); //marker
1902
1903     s1->pan_scan.width= 16*w;
1904     s1->pan_scan.height=16*h;
1905
1906     if(s->aspect_ratio_info > 1)
1907         s->avctx->sample_aspect_ratio=
1908             av_div_q(
1909                 mpeg2_aspect[s->aspect_ratio_info],
1910                 (AVRational){w, h}
1911             );
1912
1913     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1914         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1915 }
1916
1917 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1918 {
1919     MpegEncContext *s= &s1->mpeg_enc_ctx;
1920     int i;
1921
1922     for(i=0; i<1; i++){ //FIXME count
1923         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1924         skip_bits(&s->gb, 1); //marker
1925         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1926         skip_bits(&s->gb, 1); //marker
1927     }
1928
1929     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1930         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1931             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1932             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1933             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1934         );
1935 }
1936
1937 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1938 {
1939     int i, v, j;
1940
1941     dprintf("matrix extension\n");
1942
1943     if (get_bits1(&s->gb)) {
1944         for(i=0;i<64;i++) {
1945             v = get_bits(&s->gb, 8);
1946             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1947             s->intra_matrix[j] = v;
1948             s->chroma_intra_matrix[j] = v;
1949         }
1950     }
1951     if (get_bits1(&s->gb)) {
1952         for(i=0;i<64;i++) {
1953             v = get_bits(&s->gb, 8);
1954             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1955             s->inter_matrix[j] = v;
1956             s->chroma_inter_matrix[j] = v;
1957         }
1958     }
1959     if (get_bits1(&s->gb)) {
1960         for(i=0;i<64;i++) {
1961             v = get_bits(&s->gb, 8);
1962             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1963             s->chroma_intra_matrix[j] = v;
1964         }
1965     }
1966     if (get_bits1(&s->gb)) {
1967         for(i=0;i<64;i++) {
1968             v = get_bits(&s->gb, 8);
1969             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1970             s->chroma_inter_matrix[j] = v;
1971         }
1972     }
1973 }
1974
1975 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1976 {
1977     s->full_pel[0] = s->full_pel[1] = 0;
1978     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1979     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1980     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1981     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1982     s->intra_dc_precision = get_bits(&s->gb, 2);
1983     s->picture_structure = get_bits(&s->gb, 2);
1984     s->top_field_first = get_bits1(&s->gb);
1985     s->frame_pred_frame_dct = get_bits1(&s->gb);
1986     s->concealment_motion_vectors = get_bits1(&s->gb);
1987     s->q_scale_type = get_bits1(&s->gb);
1988     s->intra_vlc_format = get_bits1(&s->gb);
1989     s->alternate_scan = get_bits1(&s->gb);
1990     s->repeat_first_field = get_bits1(&s->gb);
1991     s->chroma_420_type = get_bits1(&s->gb);
1992     s->progressive_frame = get_bits1(&s->gb);
1993
1994     if(s->picture_structure == PICT_FRAME)
1995         s->first_field=0;
1996     else{
1997         s->first_field ^= 1;
1998         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1999     }
2000
2001     if(s->alternate_scan){
2002         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2003         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2004     }else{
2005         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2006         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2007     }
2008
2009     /* composite display not parsed */
2010     dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2011     dprintf("picture_structure=%d\n", s->picture_structure);
2012     dprintf("top field first=%d\n", s->top_field_first);
2013     dprintf("repeat first field=%d\n", s->repeat_first_field);
2014     dprintf("conceal=%d\n", s->concealment_motion_vectors);
2015     dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2016     dprintf("alternate_scan=%d\n", s->alternate_scan);
2017     dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2018     dprintf("progressive_frame=%d\n", s->progressive_frame);
2019 }
2020
2021 static void mpeg_decode_extension(AVCodecContext *avctx,
2022                                   uint8_t *buf, int buf_size)
2023 {
2024     Mpeg1Context *s1 = avctx->priv_data;
2025     MpegEncContext *s = &s1->mpeg_enc_ctx;
2026     int ext_type;
2027
2028     init_get_bits(&s->gb, buf, buf_size*8);
2029
2030     ext_type = get_bits(&s->gb, 4);
2031     switch(ext_type) {
2032     case 0x1:
2033         mpeg_decode_sequence_extension(s);
2034         break;
2035     case 0x2:
2036         mpeg_decode_sequence_display_extension(s1);
2037         break;
2038     case 0x3:
2039         mpeg_decode_quant_matrix_extension(s);
2040         break;
2041     case 0x7:
2042         mpeg_decode_picture_display_extension(s1);
2043         break;
2044     case 0x8:
2045         mpeg_decode_picture_coding_extension(s);
2046         break;
2047     }
2048 }
2049
2050 static void exchange_uv(MpegEncContext *s){
2051 short * tmp;
2052
2053     tmp = s->pblocks[4];
2054     s->pblocks[4] = s->pblocks[5];
2055     s->pblocks[5] = tmp;
2056 }
2057
2058 static int mpeg_field_start(MpegEncContext *s){
2059     AVCodecContext *avctx= s->avctx;
2060     Mpeg1Context *s1 = (Mpeg1Context*)s;
2061
2062     /* start frame decoding */
2063     if(s->first_field || s->picture_structure==PICT_FRAME){
2064         if(MPV_frame_start(s, avctx) < 0)
2065             return -1;
2066
2067         ff_er_frame_start(s);
2068
2069         /* first check if we must repeat the frame */
2070         s->current_picture_ptr->repeat_pict = 0;
2071         if (s->repeat_first_field) {
2072             if (s->progressive_sequence) {
2073                 if (s->top_field_first)
2074                     s->current_picture_ptr->repeat_pict = 4;
2075                 else
2076                     s->current_picture_ptr->repeat_pict = 2;
2077             } else if (s->progressive_frame) {
2078                 s->current_picture_ptr->repeat_pict = 1;
2079             }
2080         }
2081
2082         *s->current_picture_ptr->pan_scan= s1->pan_scan;
2083     }else{ //second field
2084             int i;
2085
2086             if(!s->current_picture_ptr){
2087                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2088                 return -1;
2089             }
2090
2091             for(i=0; i<4; i++){
2092                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
2093                 if(s->picture_structure == PICT_BOTTOM_FIELD){
2094                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2095                 }
2096             }
2097     }
2098 #ifdef HAVE_XVMC
2099 // MPV_frame_start will call this function too,
2100 // but we need to call it on every field
2101     if(s->avctx->xvmc_acceleration)
2102          XVMC_field_start(s,avctx);
2103 #endif
2104
2105     return 0;
2106 }
2107
2108 #define DECODE_SLICE_ERROR -1
2109 #define DECODE_SLICE_OK 0
2110
2111 /**
2112  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2113  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2114  *         DECODE_SLICE_OK if this slice is ok<br>
2115  */
2116 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2117                               uint8_t **buf, int buf_size)
2118 {
2119     MpegEncContext *s = &s1->mpeg_enc_ctx;
2120     AVCodecContext *avctx= s->avctx;
2121     int ret;
2122     const int field_pic= s->picture_structure != PICT_FRAME;
2123
2124     s->resync_mb_x=
2125     s->resync_mb_y= -1;
2126
2127     if (mb_y >= s->mb_height){
2128         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", s->mb_y, s->mb_height);
2129         return -1;
2130     }
2131
2132     init_get_bits(&s->gb, *buf, buf_size*8);
2133
2134     ff_mpeg1_clean_buffers(s);
2135     s->interlaced_dct = 0;
2136
2137     s->qscale = get_qscale(s);
2138
2139     if(s->qscale == 0){
2140         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2141         return -1;
2142     }
2143
2144     /* extra slice info */
2145     while (get_bits1(&s->gb) != 0) {
2146         skip_bits(&s->gb, 8);
2147     }
2148
2149     s->mb_x=0;
2150
2151     for(;;) {
2152         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2153         if (code < 0){
2154             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2155             return -1;
2156         }
2157         if (code >= 33) {
2158             if (code == 33) {
2159                 s->mb_x += 33;
2160             }
2161             /* otherwise, stuffing, nothing to do */
2162         } else {
2163             s->mb_x += code;
2164             break;
2165         }
2166     }
2167
2168     s->resync_mb_x= s->mb_x;
2169     s->resync_mb_y= s->mb_y= mb_y;
2170     s->mb_skip_run= 0;
2171     ff_init_block_index(s);
2172
2173     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2174         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2175              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",
2176                  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],
2177                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
2178                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
2179                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2180                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2181         }
2182     }
2183
2184     for(;;) {
2185 #ifdef HAVE_XVMC
2186         //one 1 we memcpy blocks in xvmcvideo
2187         if(s->avctx->xvmc_acceleration > 1)
2188             XVMC_init_block(s);//set s->block
2189 #endif
2190
2191         s->dsp.clear_blocks(s->block[0]);
2192
2193         ret = mpeg_decode_mb(s, s->block);
2194         s->chroma_qscale= s->qscale;
2195
2196         dprintf("ret=%d\n", ret);
2197         if (ret < 0)
2198             return -1;
2199
2200         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2201             const int wrap = field_pic ? 2*s->block_wrap[0] : s->block_wrap[0];
2202             int xy = s->mb_x*2 + 1 + (s->mb_y*2 +1)*wrap;
2203             int motion_x, motion_y, dir, i;
2204             if(field_pic && !s->first_field)
2205                 xy += wrap/2;
2206
2207             for(i=0; i<2; i++){
2208                 for(dir=0; dir<2; dir++){
2209                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2210                         motion_x = motion_y = 0;
2211                     }else if (s->mv_type == MV_TYPE_16X16){
2212                         motion_x = s->mv[dir][0][0];
2213                         motion_y = s->mv[dir][0][1];
2214                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2215                         motion_x = s->mv[dir][i][0];
2216                         motion_y = s->mv[dir][i][1];
2217                     }
2218
2219                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2220                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2221                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2222                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2223                 }
2224                 xy += wrap;
2225             }
2226         }
2227
2228         s->dest[0] += 16;
2229         s->dest[1] += 8;
2230         s->dest[2] += 8;
2231
2232         MPV_decode_mb(s, s->block);
2233
2234         if (++s->mb_x >= s->mb_width) {
2235
2236             ff_draw_horiz_band(s, 16*s->mb_y, 16);
2237
2238             s->mb_x = 0;
2239             s->mb_y++;
2240
2241             if(s->mb_y<<field_pic >= s->mb_height){
2242                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2243
2244                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2245                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2246                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d\n", left);
2247                     return -1;
2248                 }else
2249                     goto eos;
2250             }
2251
2252             ff_init_block_index(s);
2253         }
2254
2255         /* skip mb handling */
2256         if (s->mb_skip_run == -1) {
2257             /* read again increment */
2258             s->mb_skip_run = 0;
2259             for(;;) {
2260                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2261                 if (code < 0){
2262                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2263                     return -1;
2264                 }
2265                 if (code >= 33) {
2266                     if (code == 33) {
2267                         s->mb_skip_run += 33;
2268                     }else if(code == 35){
2269                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2270                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2271                             return -1;
2272                         }
2273                         goto eos; /* end of slice */
2274                     }
2275                     /* otherwise, stuffing, nothing to do */
2276                 } else {
2277                     s->mb_skip_run += code;
2278                     break;
2279                 }
2280             }
2281         }
2282     }
2283 eos: // end of slice
2284     *buf += get_bits_count(&s->gb)/8 - 1;
2285 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2286     return 0;
2287 }
2288
2289 static int slice_decode_thread(AVCodecContext *c, void *arg){
2290     MpegEncContext *s= arg;
2291     const uint8_t *buf= s->gb.buffer;
2292     int mb_y= s->start_mb_y;
2293
2294     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2295
2296     for(;;){
2297         int start_code, ret;
2298
2299         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2300         emms_c();
2301 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2302 //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);
2303         if(ret < 0){
2304             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2305                 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);
2306         }else{
2307             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);
2308         }
2309
2310         if(s->mb_y == s->end_mb_y)
2311             return 0;
2312
2313         start_code = find_start_code(&buf, s->gb.buffer_end);
2314         mb_y= start_code - SLICE_MIN_START_CODE;
2315         if(mb_y < 0 || mb_y >= s->end_mb_y)
2316             return -1;
2317     }
2318
2319     return 0; //not reached
2320 }
2321
2322 /**
2323  * handles slice ends.
2324  * @return 1 if it seems to be the last slice of
2325  */
2326 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2327 {
2328     Mpeg1Context *s1 = avctx->priv_data;
2329     MpegEncContext *s = &s1->mpeg_enc_ctx;
2330
2331     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2332         return 0;
2333
2334 #ifdef HAVE_XVMC
2335     if(s->avctx->xvmc_acceleration)
2336         XVMC_field_end(s);
2337 #endif
2338     /* end of slice reached */
2339     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2340         /* end of image */
2341
2342         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2343
2344         ff_er_frame_end(s);
2345
2346         MPV_frame_end(s);
2347
2348         if (s->pict_type == B_TYPE || s->low_delay) {
2349             *pict= *(AVFrame*)s->current_picture_ptr;
2350             ff_print_debug_info(s, pict);
2351         } else {
2352             s->picture_number++;
2353             /* latency of 1 frame for I and P frames */
2354             /* XXX: use another variable than picture_number */
2355             if (s->last_picture_ptr != NULL) {
2356                 *pict= *(AVFrame*)s->last_picture_ptr;
2357                  ff_print_debug_info(s, pict);
2358             }
2359         }
2360
2361         return 1;
2362     } else {
2363         return 0;
2364     }
2365 }
2366
2367 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2368                                  uint8_t *buf, int buf_size)
2369 {
2370     Mpeg1Context *s1 = avctx->priv_data;
2371     MpegEncContext *s = &s1->mpeg_enc_ctx;
2372     int width, height, i, v, j;
2373     float aspect;
2374
2375     init_get_bits(&s->gb, buf, buf_size*8);
2376
2377     width = get_bits(&s->gb, 12);
2378     height = get_bits(&s->gb, 12);
2379     s->aspect_ratio_info= get_bits(&s->gb, 4);
2380     if (s->aspect_ratio_info == 0)
2381         return -1;
2382     aspect= 1.0/mpeg1_aspect[s->aspect_ratio_info];
2383     avctx->sample_aspect_ratio= av_d2q(aspect, 255);
2384
2385     s->frame_rate_index = get_bits(&s->gb, 4);
2386     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2387         return -1;
2388     s->bit_rate = get_bits(&s->gb, 18) * 400;
2389     if (get_bits1(&s->gb) == 0) /* marker */
2390         return -1;
2391     if (width <= 0 || height <= 0 ||
2392         (width % 2) != 0 || (height % 2) != 0)
2393         return -1;
2394     if (width != s->width ||
2395         height != s->height) {
2396         /* start new mpeg1 context decoding */
2397         s->out_format = FMT_MPEG1;
2398         if (s1->mpeg_enc_ctx_allocated) {
2399             MPV_common_end(s);
2400         }
2401         s->width = width;
2402         s->height = height;
2403         avctx->has_b_frames= 1;
2404         avctx->width = width;
2405         avctx->height = height;
2406         avctx->frame_rate     = frame_rate_tab[s->frame_rate_index].num;
2407         avctx->frame_rate_base= frame_rate_tab[s->frame_rate_index].den;
2408         avctx->bit_rate = s->bit_rate;
2409
2410         if(avctx->xvmc_acceleration){
2411             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2412         }else{
2413             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2414         }
2415
2416         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2417             if( avctx->idct_algo == FF_IDCT_AUTO )
2418                 avctx->idct_algo = FF_IDCT_SIMPLE;
2419
2420         if (MPV_common_init(s) < 0)
2421             return -1;
2422         s1->mpeg_enc_ctx_allocated = 1;
2423         s->swap_uv = 0;//just in case vcr2 and mpeg2 stream have been concatinated
2424     }
2425
2426     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2427     skip_bits(&s->gb, 1);
2428
2429     /* get matrix */
2430     if (get_bits1(&s->gb)) {
2431         for(i=0;i<64;i++) {
2432             v = get_bits(&s->gb, 8);
2433             if(v==0){
2434                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2435                 return -1;
2436             }
2437             j = s->intra_scantable.permutated[i];
2438             s->intra_matrix[j] = v;
2439             s->chroma_intra_matrix[j] = v;
2440         }
2441 #ifdef DEBUG
2442         dprintf("intra matrix present\n");
2443         for(i=0;i<64;i++)
2444             dprintf(" %d", s->intra_matrix[s->intra_scantable.permutated[i]]);
2445         printf("\n");
2446 #endif
2447     } else {
2448         for(i=0;i<64;i++) {
2449             int j= s->dsp.idct_permutation[i];
2450             v = ff_mpeg1_default_intra_matrix[i];
2451             s->intra_matrix[j] = v;
2452             s->chroma_intra_matrix[j] = v;
2453         }
2454     }
2455     if (get_bits1(&s->gb)) {
2456         for(i=0;i<64;i++) {
2457             v = get_bits(&s->gb, 8);
2458             if(v==0){
2459                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2460                 return -1;
2461             }
2462             j = s->intra_scantable.permutated[i];
2463             s->inter_matrix[j] = v;
2464             s->chroma_inter_matrix[j] = v;
2465         }
2466 #ifdef DEBUG
2467         dprintf("non intra matrix present\n");
2468         for(i=0;i<64;i++)
2469             dprintf(" %d", s->inter_matrix[s->intra_scantable.permutated[i]]);
2470         printf("\n");
2471 #endif
2472     } else {
2473         for(i=0;i<64;i++) {
2474             int j= s->dsp.idct_permutation[i];
2475             v = ff_mpeg1_default_non_intra_matrix[i];
2476             s->inter_matrix[j] = v;
2477             s->chroma_inter_matrix[j] = v;
2478         }
2479     }
2480
2481     if(show_bits(&s->gb, 23) != 0){
2482         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2483         return -1;
2484     }
2485
2486     /* we set mpeg2 parameters so that it emulates mpeg1 */
2487     s->progressive_sequence = 1;
2488     s->progressive_frame = 1;
2489     s->picture_structure = PICT_FRAME;
2490     s->frame_pred_frame_dct = 1;
2491     s->chroma_format = 1;
2492     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2493     avctx->sub_id = 1; /* indicates mpeg1 */
2494     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2495
2496     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2497         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2498                s->avctx->rc_buffer_size, s->bit_rate);
2499
2500     return 0;
2501 }
2502
2503 static int vcr2_init_sequence(AVCodecContext *avctx)
2504 {
2505     Mpeg1Context *s1 = avctx->priv_data;
2506     MpegEncContext *s = &s1->mpeg_enc_ctx;
2507     int i, v;
2508
2509     /* start new mpeg1 context decoding */
2510     s->out_format = FMT_MPEG1;
2511     if (s1->mpeg_enc_ctx_allocated) {
2512         MPV_common_end(s);
2513     }
2514     s->width = avctx->width;
2515     s->height = avctx->height;
2516     avctx->has_b_frames= 0; //true?
2517     s->low_delay= 1;
2518
2519     if(avctx->xvmc_acceleration){
2520         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2521     }else{
2522         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2523     }
2524
2525     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2526         if( avctx->idct_algo == FF_IDCT_AUTO )
2527             avctx->idct_algo = FF_IDCT_SIMPLE;
2528
2529     if (MPV_common_init(s) < 0)
2530         return -1;
2531     exchange_uv(s);//common init reset pblocks, so we swap them here
2532     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2533     s1->mpeg_enc_ctx_allocated = 1;
2534
2535     for(i=0;i<64;i++) {
2536         int j= s->dsp.idct_permutation[i];
2537         v = ff_mpeg1_default_intra_matrix[i];
2538         s->intra_matrix[j] = v;
2539         s->chroma_intra_matrix[j] = v;
2540
2541         v = ff_mpeg1_default_non_intra_matrix[i];
2542         s->inter_matrix[j] = v;
2543         s->chroma_inter_matrix[j] = v;
2544     }
2545
2546     s->progressive_sequence = 1;
2547     s->progressive_frame = 1;
2548     s->picture_structure = PICT_FRAME;
2549     s->frame_pred_frame_dct = 1;
2550     s->chroma_format = 1;
2551     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2552     avctx->sub_id = 2; /* indicates mpeg2 */
2553     return 0;
2554 }
2555
2556
2557 static void mpeg_decode_user_data(AVCodecContext *avctx,
2558                                   const uint8_t *buf, int buf_size)
2559 {
2560     const uint8_t *p;
2561     int len, flags;
2562     p = buf;
2563     len = buf_size;
2564
2565     /* we parse the DTG active format information */
2566     if (len >= 5 &&
2567         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2568         flags = p[4];
2569         p += 5;
2570         len -= 5;
2571         if (flags & 0x80) {
2572             /* skip event id */
2573             if (len < 2)
2574                 return;
2575             p += 2;
2576             len -= 2;
2577         }
2578         if (flags & 0x40) {
2579             if (len < 1)
2580                 return;
2581             avctx->dtg_active_format = p[0] & 0x0f;
2582         }
2583     }
2584 }
2585
2586 static void mpeg_decode_gop(AVCodecContext *avctx,
2587                             uint8_t *buf, int buf_size){
2588     Mpeg1Context *s1 = avctx->priv_data;
2589     MpegEncContext *s = &s1->mpeg_enc_ctx;
2590
2591     int drop_frame_flag;
2592     int time_code_hours, time_code_minutes;
2593     int time_code_seconds, time_code_pictures;
2594     int broken_link;
2595
2596     s->first_field = 0;
2597
2598     init_get_bits(&s->gb, buf, buf_size*8);
2599
2600     drop_frame_flag = get_bits1(&s->gb);
2601
2602     time_code_hours=get_bits(&s->gb,5);
2603     time_code_minutes = get_bits(&s->gb,6);
2604     skip_bits1(&s->gb);//marker bit
2605     time_code_seconds = get_bits(&s->gb,6);
2606     time_code_pictures = get_bits(&s->gb,6);
2607     /*broken_link indicate that after editing the
2608       reference frames of the first B-Frames after GOP I-Frame
2609       are missing (open gop)*/
2610     broken_link = get_bits1(&s->gb);
2611     if(broken_link == 1){
2612 //        avcodec_flush_buffers(avctx);
2613         ff_mpeg_flush(avctx);
2614     }
2615 }
2616
2617 /**
2618  * finds the end of the current frame in the bitstream.
2619  * @return the position of the first byte of the next frame, or -1
2620  */
2621 static int mpeg1_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
2622     ParseContext *pc= &s->parse_context;
2623     int i;
2624     uint32_t state;
2625
2626     state= pc->state;
2627
2628     i=0;
2629     if(!pc->frame_start_found){
2630         for(i=0; i<buf_size; i++){
2631             state= (state<<8) | buf[i];
2632             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2633                 i++;
2634                 pc->frame_start_found=1;
2635                 break;
2636             }
2637         }
2638     }
2639
2640     if(pc->frame_start_found){
2641         for(; i<buf_size; i++){
2642             state= (state<<8) | buf[i];
2643             if((state&0xFFFFFF00) == 0x100){
2644                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2645                     pc->frame_start_found=0;
2646                     pc->state=-1;
2647                     return i-3;
2648                 }
2649             }
2650         }
2651     }
2652     pc->state= state;
2653     return END_NOT_FOUND;
2654 }
2655
2656 /* handle buffering and image synchronisation */
2657 static int mpeg_decode_frame(AVCodecContext *avctx,
2658                              void *data, int *data_size,
2659                              uint8_t *buf, int buf_size)
2660 {
2661     Mpeg1Context *s = avctx->priv_data;
2662     uint8_t *buf_end, *buf_ptr;
2663     int ret, start_code, input_size;
2664     AVFrame *picture = data;
2665     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2666     dprintf("fill_buffer\n");
2667
2668     *data_size = 0;
2669
2670     /* special case for last picture */
2671     if (buf_size == 0 && s2->low_delay==0 && s2->next_picture_ptr) {
2672         *picture= *(AVFrame*)s2->next_picture_ptr;
2673         s2->next_picture_ptr= NULL;
2674
2675         *data_size = sizeof(AVFrame);
2676         return 0;
2677     }
2678
2679     if(s2->flags&CODEC_FLAG_TRUNCATED){
2680         int next= mpeg1_find_frame_end(s2, buf, buf_size);
2681
2682         if( ff_combine_frame(s2, next, &buf, &buf_size) < 0 )
2683             return buf_size;
2684     }
2685
2686     buf_ptr = buf;
2687     buf_end = buf + buf_size;
2688
2689 #if 0
2690     if (s->repeat_field % 2 == 1) {
2691         s->repeat_field++;
2692         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2693         //        s2->picture_number, s->repeat_field);
2694         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2695             *data_size = sizeof(AVPicture);
2696             goto the_end;
2697         }
2698     }
2699 #endif
2700
2701     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2702         vcr2_init_sequence(avctx);
2703
2704     s->slice_count= 0;
2705
2706     for(;;) {
2707         /* find start next code */
2708         start_code = find_start_code(&buf_ptr, buf_end);
2709         if (start_code < 0){
2710             if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
2711                 if(avctx->thread_count > 1){
2712                     int i;
2713
2714                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2715                     for(i=0; i<s->slice_count; i++)
2716                         s2->error_count += s2->thread_context[i]->error_count;
2717                 }
2718                 if (slice_end(avctx, picture)) {
2719                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2720                         *data_size = sizeof(AVPicture);
2721                 }
2722             }
2723             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2724         }
2725
2726         input_size = buf_end - buf_ptr;
2727
2728         if(avctx->debug & FF_DEBUG_STARTCODE){
2729             av_log(avctx, AV_LOG_DEBUG, "%3X at %d left %d\n", start_code, buf_ptr-buf, input_size);
2730         }
2731
2732                 /* prepare data for next start code */
2733                 switch(start_code) {
2734                 case SEQ_START_CODE:
2735                     mpeg1_decode_sequence(avctx, buf_ptr,
2736                                           input_size);
2737                     break;
2738
2739                 case PICTURE_START_CODE:
2740                     /* we have a complete image : we try to decompress it */
2741                     mpeg1_decode_picture(avctx,
2742                                          buf_ptr, input_size);
2743                     break;
2744                 case EXT_START_CODE:
2745                     mpeg_decode_extension(avctx,
2746                                           buf_ptr, input_size);
2747                     break;
2748                 case USER_START_CODE:
2749                     mpeg_decode_user_data(avctx,
2750                                           buf_ptr, input_size);
2751                     break;
2752                 case GOP_START_CODE:
2753                     mpeg_decode_gop(avctx, buf_ptr, input_size);
2754                     break;
2755                 default:
2756                     if (start_code >= SLICE_MIN_START_CODE &&
2757                         start_code <= SLICE_MAX_START_CODE) {
2758                         int mb_y= start_code - SLICE_MIN_START_CODE;
2759
2760                         /* skip b frames if we dont have reference frames */
2761                         if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2762                         /* skip b frames if we are in a hurry */
2763                         if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2764                         /* skip everything if we are in a hurry>=5 */
2765                         if(avctx->hurry_up>=5) break;
2766
2767                         if (!s->mpeg_enc_ctx_allocated) break;
2768
2769                         if(s2->first_slice){
2770                             s2->first_slice=0;
2771                             if(mpeg_field_start(s2) < 0)
2772                                 return -1;
2773                         }
2774
2775                         if(avctx->thread_count > 1){
2776                             int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2777                             if(threshold <= mb_y){
2778                                 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2779
2780                                 thread_context->start_mb_y= mb_y;
2781                                 thread_context->end_mb_y  = s2->mb_height;
2782                                 if(s->slice_count){
2783                                     s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2784                                     ff_update_duplicate_context(thread_context, s2);
2785                                 }
2786                                 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2787                                 s->slice_count++;
2788                             }
2789                             buf_ptr += 2; //FIXME add minimum num of bytes per slice
2790                         }else{
2791                             ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2792                             emms_c();
2793
2794                             if(ret < 0){
2795                                 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2796                                     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);
2797                             }else{
2798                                 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);
2799                             }
2800                         }
2801                     }
2802                     break;
2803                 }
2804     }
2805 }
2806
2807 static int mpeg_decode_end(AVCodecContext *avctx)
2808 {
2809     Mpeg1Context *s = avctx->priv_data;
2810
2811     if (s->mpeg_enc_ctx_allocated)
2812         MPV_common_end(&s->mpeg_enc_ctx);
2813     return 0;
2814 }
2815
2816 AVCodec mpeg1video_decoder = {
2817     "mpeg1video",
2818     CODEC_TYPE_VIDEO,
2819     CODEC_ID_MPEG1VIDEO,
2820     sizeof(Mpeg1Context),
2821     mpeg_decode_init,
2822     NULL,
2823     mpeg_decode_end,
2824     mpeg_decode_frame,
2825     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2826     .flush= ff_mpeg_flush,
2827 };
2828
2829 AVCodec mpeg2video_decoder = {
2830     "mpeg2video",
2831     CODEC_TYPE_VIDEO,
2832     CODEC_ID_MPEG2VIDEO,
2833     sizeof(Mpeg1Context),
2834     mpeg_decode_init,
2835     NULL,
2836     mpeg_decode_end,
2837     mpeg_decode_frame,
2838     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2839     .flush= ff_mpeg_flush,
2840 };
2841
2842 //legacy decoder
2843 AVCodec mpegvideo_decoder = {
2844     "mpegvideo",
2845     CODEC_TYPE_VIDEO,
2846     CODEC_ID_MPEG2VIDEO,
2847     sizeof(Mpeg1Context),
2848     mpeg_decode_init,
2849     NULL,
2850     mpeg_decode_end,
2851     mpeg_decode_frame,
2852     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2853     .flush= ff_mpeg_flush,
2854 };
2855
2856 #ifdef CONFIG_ENCODERS
2857
2858 AVCodec mpeg1video_encoder = {
2859     "mpeg1video",
2860     CODEC_TYPE_VIDEO,
2861     CODEC_ID_MPEG1VIDEO,
2862     sizeof(MpegEncContext),
2863     encode_init,
2864     MPV_encode_picture,
2865     MPV_encode_end,
2866     .supported_framerates= frame_rate_tab+1,
2867 };
2868
2869 #ifdef CONFIG_RISKY
2870
2871 AVCodec mpeg2video_encoder = {
2872     "mpeg2video",
2873     CODEC_TYPE_VIDEO,
2874     CODEC_ID_MPEG2VIDEO,
2875     sizeof(MpegEncContext),
2876     encode_init,
2877     MPV_encode_picture,
2878     MPV_encode_end,
2879     .supported_framerates= frame_rate_tab+1,
2880 };
2881 #endif
2882 #endif
2883
2884 #ifdef HAVE_XVMC
2885 static int mpeg_mc_decode_init(AVCodecContext *avctx){
2886     Mpeg1Context *s;
2887
2888     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2889         return -1;
2890     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2891         dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2892     }
2893     mpeg_decode_init(avctx);
2894     s = avctx->priv_data;
2895
2896     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2897     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2898
2899     return 0;
2900 }
2901
2902 AVCodec mpeg_xvmc_decoder = {
2903     "mpegvideo_xvmc",
2904     CODEC_TYPE_VIDEO,
2905     CODEC_ID_MPEG2VIDEO_XVMC,
2906     sizeof(Mpeg1Context),
2907     mpeg_mc_decode_init,
2908     NULL,
2909     mpeg_decode_end,
2910     mpeg_decode_frame,
2911     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL,
2912     .flush= ff_mpeg_flush,
2913 };
2914
2915 #endif
2916
2917 /* this is ugly i know, but the alternative is too make
2918    hundreds of vars global and prefix them with ff_mpeg1_
2919    which is far uglier. */
2920 #include "mdec.c"