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

   1 /*
   2  * MPEG1 codec / MPEG2 decoder
   3  * Copyright (c) 2000,2001 Fabrice Bellard.
   4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 /**
  22  * @file mpeg12.c
  23  * MPEG1/2 codec
  24  */
  25
  26 //#define DEBUG
  27 #include "avcodec.h"
  28 #include "dsputil.h"
  29 #include "mpegvideo.h"
  30
  31 #include "mpeg12data.h"
  32
  33 //#undef NDEBUG
  34 //#include <assert.h>
  35
  36
  37 /* Start codes. */
  38 #define SEQ_END_CODE            0x000001b7
  39 #define SEQ_START_CODE          0x000001b3
  40 #define GOP_START_CODE          0x000001b8
  41 #define PICTURE_START_CODE      0x00000100
  42 #define SLICE_MIN_START_CODE    0x00000101
  43 #define SLICE_MAX_START_CODE    0x000001af
  44 #define EXT_START_CODE          0x000001b5
  45 #define USER_START_CODE         0x000001b2
  46
  47 #define DC_VLC_BITS 9
  48 #define MV_VLC_BITS 9
  49 #define MBINCR_VLC_BITS 9
  50 #define MB_PAT_VLC_BITS 9
  51 #define MB_PTYPE_VLC_BITS 6
  52 #define MB_BTYPE_VLC_BITS 6
  53 #define TEX_VLC_BITS 9
  54
  55 #ifdef CONFIG_ENCODERS
  56 static void mpeg1_encode_block(MpegEncContext *s,
  57                          DCTELEM *block,
  58                          int component);
  59 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
  60 #endif //CONFIG_ENCODERS
  61 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
  62                               DCTELEM *block,
  63                               int n);
  64 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
  65                               DCTELEM *block,
  66                               int n);
  67 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
  68                                         DCTELEM *block,
  69                                         int n);
  70 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
  71                                     DCTELEM *block,
  72                                     int n);
  73 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
  74 static void exchange_uv(MpegEncContext *s);
  75
  76 #ifdef HAVE_XVMC
  77 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
  78 extern int XVMC_field_end(MpegEncContext *s);
  79 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
  80 extern void XVMC_init_block(MpegEncContext *s);//set s->block
  81 #endif
  82
  83 const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
  84 const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
  85 const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
  86 const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
  87                                            PIX_FMT_XVMC_MPEG2_IDCT,
  88                                            PIX_FMT_XVMC_MPEG2_MC,
  89                                            -1};
  90 #ifdef CONFIG_ENCODERS
  91 static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
  92 static uint8_t fcode_tab[MAX_MV*2+1];
  93
  94 static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
  95 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
  96
  97 /* simple include everything table for dc, first byte is bits number next 3 are code*/
  98 static uint32_t mpeg1_lum_dc_uni[512];
  99 static uint32_t mpeg1_chr_dc_uni[512];
 100
 101 static uint8_t mpeg1_index_run[2][64];
 102 static int8_t mpeg1_max_level[2][64];
 103 #endif //CONFIG_ENCODERS
 104
 105 static void init_2d_vlc_rl(RLTable *rl)
 106 {
 107     int i;
 108
 109     init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
 110              &rl->table_vlc[0][1], 4, 2,
 111              &rl->table_vlc[0][0], 4, 2);
 112
 113
 114     rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
 115     for(i=0; i<rl->vlc.table_size; i++){
 116         int code= rl->vlc.table[i][0];
 117         int len = rl->vlc.table[i][1];
 118         int level, run;
 119
 120         if(len==0){ // illegal code
 121             run= 65;
 122             level= MAX_LEVEL;
 123         }else if(len<0){ //more bits needed
 124             run= 0;
 125             level= code;
 126         }else{
 127             if(code==rl->n){ //esc
 128                 run= 65;
 129                 level= 0;
 130             }else if(code==rl->n+1){ //eob
 131                 run= 0;
 132                 level= 127;
 133             }else{
 134                 run=   rl->table_run  [code] + 1;
 135                 level= rl->table_level[code];
 136             }
 137         }
 138         rl->rl_vlc[0][i].len= len;
 139         rl->rl_vlc[0][i].level= level;
 140         rl->rl_vlc[0][i].run= run;
 141     }
 142 }
 143
 144 #ifdef CONFIG_ENCODERS
 145 static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
 146     int i;
 147
 148     for(i=0; i<128; i++){
 149         int level= i-64;
 150         int run;
 151         for(run=0; run<64; run++){
 152             int len, bits, code;
 153
 154             int alevel= ABS(level);
 155             int sign= (level>>31)&1;
 156
 157             if (alevel > rl->max_level[0][run])
 158                 code= 111; /*rl->n*/
 159             else
 160                 code= rl->index_run[0][run] + alevel - 1;
 161
 162             if (code < 111 /* rl->n */) {
 163                 /* store the vlc & sign at once */
 164                 len=   mpeg1_vlc[code][1]+1;
 165                 bits= (mpeg1_vlc[code][0]<<1) + sign;
 166             } else {
 167                 len=  mpeg1_vlc[111/*rl->n*/][1]+6;
 168                 bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
 169
 170                 bits|= run;
 171                 if (alevel < 128) {
 172                     bits<<=8; len+=8;
 173                     bits|= level & 0xff;
 174                 } else {
 175                     bits<<=16; len+=16;
 176                     bits|= level & 0xff;
 177                     if (level < 0) {
 178                         bits|= 0x8001 + level + 255;
 179                     } else {
 180                         bits|= level & 0xffff;
 181                     }
 182                 }
 183             }
 184
 185             uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
 186             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
 187         }
 188     }
 189 }
 190
 191
 192 static int find_frame_rate_index(MpegEncContext *s){
 193     int i;
 194     int64_t dmin= INT64_MAX;
 195     int64_t d;
 196
 197     for(i=1;i<14;i++) {
 198         int64_t n0= 1001LL/frame_rate_tab[i].den*frame_rate_tab[i].num*s->avctx->frame_rate_base;
 199         int64_t n1= 1001LL*s->avctx->frame_rate;
 200         if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
 201
 202         d = ABS(n0 - n1);
 203         if(d < dmin){
 204             dmin=d;
 205             s->frame_rate_index= i;
 206         }
 207     }
 208     if(dmin)
 209         return -1;
 210     else
 211         return 0;
 212 }
 213
 214 static int encode_init(AVCodecContext *avctx)
 215 {
 216     MpegEncContext *s = avctx->priv_data;
 217
 218     if(MPV_encode_init(avctx) < 0)
 219         return -1;
 220
 221     if(find_frame_rate_index(s) < 0){
 222         if(s->strict_std_compliance >=0){
 223             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 doesnt support %d/%d fps\n", avctx->frame_rate, avctx->frame_rate_base);
 224             return -1;
 225         }else{
 226             av_log(avctx, AV_LOG_INFO, "MPEG1/2 doesnt support %d/%d fps, there may be AV sync issues\n", avctx->frame_rate, avctx->frame_rate_base);
 227         }
 228     }
 229
 230     return 0;
 231 }
 232
 233 static void put_header(MpegEncContext *s, int header)
 234 {
 235     align_put_bits(&s->pb);
 236     put_bits(&s->pb, 16, header>>16);
 237     put_bits(&s->pb, 16, header&0xFFFF);
 238 }
 239
 240 /* put sequence header if needed */
 241 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 242 {
 243         unsigned int vbv_buffer_size;
 244         unsigned int fps, v;
 245         int i;
 246         uint64_t time_code;
 247         float best_aspect_error= 1E10;
 248         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 249         int constraint_parameter_flag;
 250
 251         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 252
 253         if (s->current_picture.key_frame) {
 254             AVRational framerate= frame_rate_tab[s->frame_rate_index];
 255
 256             /* mpeg1 header repeated every gop */
 257             put_header(s, SEQ_START_CODE);
 258
 259             put_bits(&s->pb, 12, s->width);
 260             put_bits(&s->pb, 12, s->height);
 261
 262             for(i=1; i<15; i++){
 263                 float error= aspect_ratio;
 264                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
 265                     error-= 1.0/mpeg1_aspect[i];
 266                 else
 267                     error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
 268
 269                 error= ABS(error);
 270
 271                 if(error < best_aspect_error){
 272                     best_aspect_error= error;
 273                     s->aspect_ratio_info= i;
 274                 }
 275             }
 276
 277             put_bits(&s->pb, 4, s->aspect_ratio_info);
 278             put_bits(&s->pb, 4, s->frame_rate_index);
 279
 280             if(s->avctx->rc_max_rate){
 281                 v = (s->avctx->rc_max_rate + 399) / 400;
 282                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
 283                     v = 0x3ffff;
 284             }else{
 285                 v= 0x3FFFF;
 286             }
 287
 288             if(s->avctx->rc_buffer_size)
 289                 vbv_buffer_size = s->avctx->rc_buffer_size;
 290             else
 291                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 292                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 293             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 294
 295             put_bits(&s->pb, 18, v & 0x3FFFF);
 296             put_bits(&s->pb, 1, 1); /* marker */
 297             put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
 298
 299             constraint_parameter_flag=
 300                 s->width <= 768 && s->height <= 576 &&
 301                 s->mb_width * s->mb_height <= 396 &&
 302                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 303                 framerate.num <= framerate.den*30 &&
 304                 vbv_buffer_size <= 20 &&
 305                 v <= 1856000/400 &&
 306                 s->codec_id == CODEC_ID_MPEG1VIDEO;
 307
 308             put_bits(&s->pb, 1, constraint_parameter_flag);
 309
 310             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 311             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 312
 313             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 314                 put_header(s, EXT_START_CODE);
 315                 put_bits(&s->pb, 4, 1); //seq ext
 316                 put_bits(&s->pb, 1, 0); //esc
 317                 put_bits(&s->pb, 3, 4); //profile
 318                 put_bits(&s->pb, 4, 8); //level
 319                 put_bits(&s->pb, 1, s->progressive_sequence);
 320                 put_bits(&s->pb, 2, 1); //chroma format 4:2:0
 321                 put_bits(&s->pb, 2, 0); //horizontal size ext
 322                 put_bits(&s->pb, 2, 0); //vertical size ext
 323                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 324                 put_bits(&s->pb, 1, 1); //marker
 325                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 326                 put_bits(&s->pb, 1, s->low_delay);
 327                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
 328                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
 329             }
 330
 331             put_header(s, GOP_START_CODE);
 332             put_bits(&s->pb, 1, 0); /* do drop frame */
 333             /* time code : we must convert from the real frame rate to a
 334                fake mpeg frame rate in case of low frame rate */
 335             fps = (framerate.num + framerate.den/2)/ framerate.den;
 336             time_code = s->current_picture_ptr->coded_picture_number;
 337
 338             s->gop_picture_number = time_code;
 339             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 340             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 341             put_bits(&s->pb, 1, 1);
 342             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 343             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 344             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 345             put_bits(&s->pb, 1, 0); /* broken link */
 346         }
 347 }
 348
 349 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 350     while (run >= 33) {
 351         put_bits(&s->pb, 11, 0x008);
 352         run -= 33;
 353     }
 354     put_bits(&s->pb, mbAddrIncrTable[run][1],
 355              mbAddrIncrTable[run][0]);
 356 }
 357 #endif //CONFIG_ENCODERS
 358
 359 static void common_init(MpegEncContext *s)
 360 {
 361
 362     s->y_dc_scale_table=
 363     s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
 364
 365 }
 366
 367 void ff_mpeg1_clean_buffers(MpegEncContext *s){
 368     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
 369     s->last_dc[1] = s->last_dc[0];
 370     s->last_dc[2] = s->last_dc[0];
 371     memset(s->last_mv, 0, sizeof(s->last_mv));
 372 }
 373
 374 #ifdef CONFIG_ENCODERS
 375
 376 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 377     put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 378     put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
 379     put_bits(&s->pb, 1, 0); /* slice extra information */
 380 }
 381
 382 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 383 {
 384     mpeg1_encode_sequence_header(s);
 385
 386     /* mpeg1 picture header */
 387     put_header(s, PICTURE_START_CODE);
 388     /* temporal reference */
 389
 390     // RAL: s->picture_number instead of s->fake_picture_number
 391     put_bits(&s->pb, 10, (s->picture_number -
 392                           s->gop_picture_number) & 0x3ff);
 393     put_bits(&s->pb, 3, s->pict_type);
 394
 395     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 396     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 397
 398     // RAL: Forward f_code also needed for B frames
 399     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
 400         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 401         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 402             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 403         else
 404             put_bits(&s->pb, 3, 7); /* forward_f_code */
 405     }
 406
 407     // RAL: Backward f_code necessary for B frames
 408     if (s->pict_type == B_TYPE) {
 409         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 410         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 411             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 412         else
 413             put_bits(&s->pb, 3, 7); /* backward_f_code */
 414     }
 415
 416     put_bits(&s->pb, 1, 0); /* extra bit picture */
 417
 418     s->frame_pred_frame_dct = 1;
 419     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 420         put_header(s, EXT_START_CODE);
 421         put_bits(&s->pb, 4, 8); //pic ext
 422         if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
 423             put_bits(&s->pb, 4, s->f_code);
 424             put_bits(&s->pb, 4, s->f_code);
 425         }else{
 426             put_bits(&s->pb, 8, 255);
 427         }
 428         if (s->pict_type == B_TYPE) {
 429             put_bits(&s->pb, 4, s->b_code);
 430             put_bits(&s->pb, 4, s->b_code);
 431         }else{
 432             put_bits(&s->pb, 8, 255);
 433         }
 434         put_bits(&s->pb, 2, s->intra_dc_precision);
 435
 436         assert(s->picture_structure == PICT_FRAME);
 437         put_bits(&s->pb, 2, s->picture_structure);
 438         if (s->progressive_sequence) {
 439             put_bits(&s->pb, 1, 0); /* no repeat */
 440         } else {
 441             put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
 442         }
 443         /* XXX: optimize the generation of this flag with entropy
 444            measures */
 445         s->frame_pred_frame_dct = s->progressive_sequence;
 446
 447         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 448         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 449         put_bits(&s->pb, 1, s->q_scale_type);
 450         put_bits(&s->pb, 1, s->intra_vlc_format);
 451         put_bits(&s->pb, 1, s->alternate_scan);
 452         put_bits(&s->pb, 1, s->repeat_first_field);
 453         put_bits(&s->pb, 1, s->chroma_420_type=1);
 454         s->progressive_frame = s->progressive_sequence;
 455         put_bits(&s->pb, 1, s->progressive_frame);
 456         put_bits(&s->pb, 1, 0); //composite_display_flag
 457     }
 458     if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
 459         int i;
 460
 461         put_header(s, USER_START_CODE);
 462         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 463             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 464         }
 465     }
 466
 467     s->mb_y=0;
 468     ff_mpeg1_encode_slice_header(s);
 469 }
 470
 471 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 472                                 int has_mv, int field_motion)
 473 {
 474     put_bits(&s->pb, n, bits);
 475     if (!s->frame_pred_frame_dct) {
 476         if (has_mv)
 477             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 478         put_bits(&s->pb, 1, s->interlaced_dct);
 479     }
 480 }
 481
 482 void mpeg1_encode_mb(MpegEncContext *s,
 483                      DCTELEM block[6][64],
 484                      int motion_x, int motion_y)
 485 {
 486     int i, cbp;
 487     const int mb_x = s->mb_x;
 488     const int mb_y = s->mb_y;
 489     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 490
 491     /* compute cbp */
 492     cbp = 0;
 493     for(i=0;i<6;i++) {
 494         if (s->block_last_index[i] >= 0)
 495             cbp |= 1 << (5 - i);
 496     }
 497
 498     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 499         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
 500         ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
 501         (s->pict_type == B_TYPE && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
 502         ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
 503         s->mb_skip_run++;
 504         s->qscale -= s->dquant;
 505         s->skip_count++;
 506         s->misc_bits++;
 507         s->last_bits++;
 508         if(s->pict_type == P_TYPE){
 509             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 510             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 511         }
 512     } else {
 513         if(first_mb){
 514             assert(s->mb_skip_run == 0);
 515             encode_mb_skip_run(s, s->mb_x);
 516         }else{
 517             encode_mb_skip_run(s, s->mb_skip_run);
 518         }
 519
 520         if (s->pict_type == I_TYPE) {
 521             if(s->dquant && cbp){
 522                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 523                 put_bits(&s->pb, 5, s->qscale);
 524             }else{
 525                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 526                 s->qscale -= s->dquant;
 527             }
 528             s->misc_bits+= get_bits_diff(s);
 529             s->i_count++;
 530         } else if (s->mb_intra) {
 531             if(s->dquant && cbp){
 532                 put_mb_modes(s, 6, 0x01, 0, 0);
 533                 put_bits(&s->pb, 5, s->qscale);
 534             }else{
 535                 put_mb_modes(s, 5, 0x03, 0, 0);
 536                 s->qscale -= s->dquant;
 537             }
 538             s->misc_bits+= get_bits_diff(s);
 539             s->i_count++;
 540             memset(s->last_mv, 0, sizeof(s->last_mv));
 541         } else if (s->pict_type == P_TYPE) {
 542             if(s->mv_type == MV_TYPE_16X16){
 543                 if (cbp != 0) {
 544                     if ((motion_x|motion_y) == 0) {
 545                         if(s->dquant){
 546                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 547                             put_bits(&s->pb, 5, s->qscale);
 548                         }else{
 549                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 550                         }
 551                         s->misc_bits+= get_bits_diff(s);
 552                     } else {
 553                         if(s->dquant){
 554                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 555                             put_bits(&s->pb, 5, s->qscale);
 556                         }else{
 557                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 558                         }
 559                         s->misc_bits+= get_bits_diff(s);
 560                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 561                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 562                         s->mv_bits+= get_bits_diff(s);
 563                     }
 564                 } else {
 565                     put_bits(&s->pb, 3, 1); /* motion only */
 566                     if (!s->frame_pred_frame_dct)
 567                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 568                     s->misc_bits+= get_bits_diff(s);
 569                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 570                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 571                     s->qscale -= s->dquant;
 572                     s->mv_bits+= get_bits_diff(s);
 573                 }
 574                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 575                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 576             }else{
 577                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 578
 579                 if (cbp) {
 580                     if(s->dquant){
 581                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 582                         put_bits(&s->pb, 5, s->qscale);
 583                     }else{
 584                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 585                     }
 586                 } else {
 587                     put_bits(&s->pb, 3, 1); /* motion only */
 588                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 589                     s->qscale -= s->dquant;
 590                 }
 591                 s->misc_bits+= get_bits_diff(s);
 592                 for(i=0; i<2; i++){
 593                     put_bits(&s->pb, 1, s->field_select[0][i]);
 594                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 595                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 596                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 597                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 598                 }
 599                 s->mv_bits+= get_bits_diff(s);
 600             }
 601             if(cbp)
 602                 put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
 603             s->f_count++;
 604         } else{
 605             static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
 606
 607             if(s->mv_type == MV_TYPE_16X16){
 608                 if (cbp){    // With coded bloc pattern
 609                     if (s->dquant) {
 610                         if(s->mv_dir == MV_DIR_FORWARD)
 611                             put_mb_modes(s, 6, 3, 1, 0);
 612                         else
 613                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
 614                         put_bits(&s->pb, 5, s->qscale);
 615                     } else {
 616                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
 617                     }
 618                 }else{    // No coded bloc pattern
 619                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
 620                     if (!s->frame_pred_frame_dct)
 621                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 622                     s->qscale -= s->dquant;
 623                 }
 624                 s->misc_bits += get_bits_diff(s);
 625                 if (s->mv_dir&MV_DIR_FORWARD){
 626                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 627                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 628                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 629                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 630                     s->f_count++;
 631                 }
 632                 if (s->mv_dir&MV_DIR_BACKWARD){
 633                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 634                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 635                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 636                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 637                     s->b_count++;
 638                 }
 639             }else{
 640                 assert(s->mv_type == MV_TYPE_FIELD);
 641                 assert(!s->frame_pred_frame_dct);
 642                 if (cbp){    // With coded bloc pattern
 643                     if (s->dquant) {
 644                         if(s->mv_dir == MV_DIR_FORWARD)
 645                             put_mb_modes(s, 6, 3, 1, 1);
 646                         else
 647                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
 648                         put_bits(&s->pb, 5, s->qscale);
 649                     } else {
 650                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
 651                     }
 652                 }else{    // No coded bloc pattern
 653                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
 654                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 655                     s->qscale -= s->dquant;
 656                 }
 657                 s->misc_bits += get_bits_diff(s);
 658                 if (s->mv_dir&MV_DIR_FORWARD){
 659                     for(i=0; i<2; i++){
 660                         put_bits(&s->pb, 1, s->field_select[0][i]);
 661                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 662                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 663                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 664                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 665                     }
 666                     s->f_count++;
 667                 }
 668                 if (s->mv_dir&MV_DIR_BACKWARD){
 669                     for(i=0; i<2; i++){
 670                         put_bits(&s->pb, 1, s->field_select[1][i]);
 671                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 672                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 673                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 674                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 675                     }
 676                     s->b_count++;
 677                 }
 678             }
 679             s->mv_bits += get_bits_diff(s);
 680             if(cbp)
 681                 put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
 682         }
 683         for(i=0;i<6;i++) {
 684             if (cbp & (1 << (5 - i))) {
 685                 mpeg1_encode_block(s, block[i], i);
 686             }
 687         }
 688         s->mb_skip_run = 0;
 689         if(s->mb_intra)
 690             s->i_tex_bits+= get_bits_diff(s);
 691         else
 692             s->p_tex_bits+= get_bits_diff(s);
 693     }
 694 }
 695
 696 // RAL: Parameter added: f_or_b_code
 697 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 698 {
 699     int code, bit_size, l, m, bits, range, sign;
 700
 701     if (val == 0) {
 702         /* zero vector */
 703         code = 0;
 704         put_bits(&s->pb,
 705                  mbMotionVectorTable[0][1],
 706                  mbMotionVectorTable[0][0]);
 707     } else {
 708         bit_size = f_or_b_code - 1;
 709         range = 1 << bit_size;
 710         /* modulo encoding */
 711         l = 16 * range;
 712         m = 2 * l;
 713         if (val < -l) {
 714             val += m;
 715         } else if (val >= l) {
 716             val -= m;
 717         }
 718
 719         if (val >= 0) {
 720             val--;
 721             code = (val >> bit_size) + 1;
 722             bits = val & (range - 1);
 723             sign = 0;
 724         } else {
 725             val = -val;
 726             val--;
 727             code = (val >> bit_size) + 1;
 728             bits = val & (range - 1);
 729             sign = 1;
 730         }
 731
 732         assert(code > 0 && code <= 16);
 733
 734         put_bits(&s->pb,
 735                  mbMotionVectorTable[code][1],
 736                  mbMotionVectorTable[code][0]);
 737
 738         put_bits(&s->pb, 1, sign);
 739         if (bit_size > 0) {
 740             put_bits(&s->pb, bit_size, bits);
 741         }
 742     }
 743 }
 744
 745 void ff_mpeg1_encode_init(MpegEncContext *s)
 746 {
 747     static int done=0;
 748
 749     common_init(s);
 750
 751     if(!done){
 752         int f_code;
 753         int mv;
 754         int i;
 755
 756         done=1;
 757         init_rl(&rl_mpeg1);
 758
 759         for(i=0; i<64; i++)
 760         {
 761                 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
 762                 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
 763         }
 764
 765         init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
 766
 767         /* build unified dc encoding tables */
 768         for(i=-255; i<256; i++)
 769         {
 770                 int adiff, index;
 771                 int bits, code;
 772                 int diff=i;
 773
 774                 adiff = ABS(diff);
 775                 if(diff<0) diff--;
 776                 index = av_log2(2*adiff);
 777
 778                 bits= vlc_dc_lum_bits[index] + index;
 779                 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 780                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 781
 782                 bits= vlc_dc_chroma_bits[index] + index;
 783                 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 784                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 785         }
 786
 787         mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
 788
 789         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 790             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 791                 int len;
 792
 793                 if(mv==0) len= mbMotionVectorTable[0][1];
 794                 else{
 795                     int val, bit_size, range, code;
 796
 797                     bit_size = f_code - 1;
 798                     range = 1 << bit_size;
 799
 800                     val=mv;
 801                     if (val < 0)
 802                         val = -val;
 803                     val--;
 804                     code = (val >> bit_size) + 1;
 805                     if(code<17){
 806                         len= mbMotionVectorTable[code][1] + 1 + bit_size;
 807                     }else{
 808                         len= mbMotionVectorTable[16][1] + 2 + bit_size;
 809                     }
 810                 }
 811
 812                 mv_penalty[f_code][mv+MAX_MV]= len;
 813             }
 814         }
 815
 816
 817         for(f_code=MAX_FCODE; f_code>0; f_code--){
 818             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 819                 fcode_tab[mv+MAX_MV]= f_code;
 820             }
 821         }
 822     }
 823     s->me.mv_penalty= mv_penalty;
 824     s->fcode_tab= fcode_tab;
 825     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 826         s->min_qcoeff=-255;
 827         s->max_qcoeff= 255;
 828     }else{
 829         s->min_qcoeff=-2047;
 830         s->max_qcoeff= 2047;
 831     }
 832     s->intra_ac_vlc_length=
 833     s->inter_ac_vlc_length=
 834     s->intra_ac_vlc_last_length=
 835     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 836 }
 837
 838 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 839 {
 840     if (component == 0) {
 841         put_bits(
 842             &s->pb,
 843             mpeg1_lum_dc_uni[diff+255]&0xFF,
 844             mpeg1_lum_dc_uni[diff+255]>>8);
 845     } else {
 846         put_bits(
 847             &s->pb,
 848             mpeg1_chr_dc_uni[diff+255]&0xFF,
 849             mpeg1_chr_dc_uni[diff+255]>>8);
 850     }
 851 }
 852
 853 static void mpeg1_encode_block(MpegEncContext *s,
 854                                DCTELEM *block,
 855                                int n)
 856 {
 857     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 858     int code, component;
 859 //    RLTable *rl = &rl_mpeg1;
 860
 861     last_index = s->block_last_index[n];
 862
 863     /* DC coef */
 864     if (s->mb_intra) {
 865         component = (n <= 3 ? 0 : n - 4 + 1);
 866         dc = block[0]; /* overflow is impossible */
 867         diff = dc - s->last_dc[component];
 868         encode_dc(s, diff, component);
 869         s->last_dc[component] = dc;
 870         i = 1;
 871 /*
 872         if (s->intra_vlc_format)
 873             rl = &rl_mpeg2;
 874         else
 875             rl = &rl_mpeg1;
 876 */
 877     } else {
 878         /* encode the first coefficient : needs to be done here because
 879            it is handled slightly differently */
 880         level = block[0];
 881         if (abs(level) == 1) {
 882                 code = ((uint32_t)level >> 31); /* the sign bit */
 883                 put_bits(&s->pb, 2, code | 0x02);
 884                 i = 1;
 885         } else {
 886             i = 0;
 887             last_non_zero = -1;
 888             goto next_coef;
 889         }
 890     }
 891
 892     /* now quantify & encode AC coefs */
 893     last_non_zero = i - 1;
 894
 895     for(;i<=last_index;i++) {
 896         j = s->intra_scantable.permutated[i];
 897         level = block[j];
 898     next_coef:
 899 #if 0
 900         if (level != 0)
 901             dprintf("level[%d]=%d\n", i, level);
 902 #endif
 903         /* encode using VLC */
 904         if (level != 0) {
 905             run = i - last_non_zero - 1;
 906
 907             alevel= level;
 908             MASK_ABS(sign, alevel)
 909             sign&=1;
 910
 911 //            code = get_rl_index(rl, 0, run, alevel);
 912             if (alevel <= mpeg1_max_level[0][run]){
 913                 code= mpeg1_index_run[0][run] + alevel - 1;
 914                 /* store the vlc & sign at once */
 915                 put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
 916             } else {
 917                 /* escape seems to be pretty rare <5% so i dont optimize it */
 918                 put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
 919                 /* escape: only clip in this case */
 920                 put_bits(&s->pb, 6, run);
 921                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 922                     if (alevel < 128) {
 923                         put_bits(&s->pb, 8, level & 0xff);
 924                     } else {
 925                         if (level < 0) {
 926                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 927                         } else {
 928                             put_bits(&s->pb, 16, level & 0xffff);
 929                         }
 930                     }
 931                 }else{
 932                     put_bits(&s->pb, 12, level & 0xfff);
 933                 }
 934             }
 935             last_non_zero = i;
 936         }
 937     }
 938     /* end of block */
 939     put_bits(&s->pb, 2, 0x2);
 940 }
 941 #endif //CONFIG_ENCODERS
 942
 943 /******************************************/
 944 /* decoding */
 945
 946 static VLC dc_lum_vlc;
 947 static VLC dc_chroma_vlc;
 948 static VLC mv_vlc;
 949 static VLC mbincr_vlc;
 950 static VLC mb_ptype_vlc;
 951 static VLC mb_btype_vlc;
 952 static VLC mb_pat_vlc;
 953
 954 static void init_vlcs(void)
 955 {
 956     static int done = 0;
 957
 958     if (!done) {
 959         done = 1;
 960
 961         init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
 962                  vlc_dc_lum_bits, 1, 1,
 963                  vlc_dc_lum_code, 2, 2);
 964         init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
 965                  vlc_dc_chroma_bits, 1, 1,
 966                  vlc_dc_chroma_code, 2, 2);
 967         init_vlc(&mv_vlc, MV_VLC_BITS, 17,
 968                  &mbMotionVectorTable[0][1], 2, 1,
 969                  &mbMotionVectorTable[0][0], 2, 1);
 970         init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
 971                  &mbAddrIncrTable[0][1], 2, 1,
 972                  &mbAddrIncrTable[0][0], 2, 1);
 973         init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
 974                  &mbPatTable[0][1], 2, 1,
 975                  &mbPatTable[0][0], 2, 1);
 976
 977         init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
 978                  &table_mb_ptype[0][1], 2, 1,
 979                  &table_mb_ptype[0][0], 2, 1);
 980         init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
 981                  &table_mb_btype[0][1], 2, 1,
 982                  &table_mb_btype[0][0], 2, 1);
 983         init_rl(&rl_mpeg1);
 984         init_rl(&rl_mpeg2);
 985
 986         init_2d_vlc_rl(&rl_mpeg1);
 987         init_2d_vlc_rl(&rl_mpeg2);
 988     }
 989 }
 990
 991 static inline int get_dmv(MpegEncContext *s)
 992 {
 993     if(get_bits1(&s->gb))
 994         return 1 - (get_bits1(&s->gb) << 1);
 995     else
 996         return 0;
 997 }
 998
 999 static inline int get_qscale(MpegEncContext *s)
1000 {
1001     int qscale = get_bits(&s->gb, 5);
1002     if (s->q_scale_type) {
1003         return non_linear_qscale[qscale];
1004     } else {
1005         return qscale << 1;
1006     }
1007 }
1008
1009 /* motion type (for mpeg2) */
1010 #define MT_FIELD 1
1011 #define MT_FRAME 2
1012 #define MT_16X8  2
1013 #define MT_DMV   3
1014
1015 static int mpeg_decode_mb(MpegEncContext *s,
1016                           DCTELEM block[12][64])
1017 {
1018     int i, j, k, cbp, val, mb_type, motion_type;
1019
1020     dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1021
1022     assert(s->mb_skiped==0);
1023
1024     if (s->mb_skip_run-- != 0) {
1025         if(s->pict_type == I_TYPE){
1026             av_log(s->avctx, AV_LOG_ERROR, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1027             return -1;
1028         }
1029
1030         /* skip mb */
1031         s->mb_intra = 0;
1032         for(i=0;i<12;i++)
1033             s->block_last_index[i] = -1;
1034         if(s->picture_structure == PICT_FRAME)
1035             s->mv_type = MV_TYPE_16X16;
1036         else
1037             s->mv_type = MV_TYPE_FIELD;
1038         if (s->pict_type == P_TYPE) {
1039             /* if P type, zero motion vector is implied */
1040             s->mv_dir = MV_DIR_FORWARD;
1041             s->mv[0][0][0] = s->mv[0][0][1] = 0;
1042             s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1043             s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1044             s->field_select[0][0]= s->picture_structure - 1;
1045             s->mb_skiped = 1;
1046             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1047         } else {
1048             /* if B type, reuse previous vectors and directions */
1049             s->mv[0][0][0] = s->last_mv[0][0][0];
1050             s->mv[0][0][1] = s->last_mv[0][0][1];
1051             s->mv[1][0][0] = s->last_mv[1][0][0];
1052             s->mv[1][0][1] = s->last_mv[1][0][1];
1053
1054             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1055                 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
1056 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1057
1058             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1059                 s->mb_skiped = 1;
1060         }
1061
1062         return 0;
1063     }
1064
1065     switch(s->pict_type) {
1066     default:
1067     case I_TYPE:
1068         if (get_bits1(&s->gb) == 0) {
1069             if (get_bits1(&s->gb) == 0){
1070                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1071                 return -1;
1072             }
1073             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1074         } else {
1075             mb_type = MB_TYPE_INTRA;
1076         }
1077         break;
1078     case P_TYPE:
1079         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1080         if (mb_type < 0){
1081             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1082             return -1;
1083         }
1084         mb_type = ptype2mb_type[ mb_type ];
1085         break;
1086     case B_TYPE:
1087         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1088         if (mb_type < 0){
1089             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1090             return -1;
1091         }
1092         mb_type = btype2mb_type[ mb_type ];
1093         break;
1094     }
1095     dprintf("mb_type=%x\n", mb_type);
1096 //    motion_type = 0; /* avoid warning */
1097     if (IS_INTRA(mb_type)) {
1098         /* compute dct type */
1099         if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1100             !s->frame_pred_frame_dct) {
1101             s->interlaced_dct = get_bits1(&s->gb);
1102         }
1103
1104         if (IS_QUANT(mb_type))
1105             s->qscale = get_qscale(s);
1106
1107         if (s->concealment_motion_vectors) {
1108             /* just parse them */
1109             if (s->picture_structure != PICT_FRAME)
1110                 skip_bits1(&s->gb); /* field select */
1111
1112             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1113                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1114             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1115                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1116
1117             skip_bits1(&s->gb); /* marker */
1118         }else
1119             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1120         s->mb_intra = 1;
1121 #ifdef HAVE_XVMC
1122         //one 1 we memcpy blocks in xvmcvideo
1123         if(s->avctx->xvmc_acceleration > 1){
1124             XVMC_pack_pblocks(s,-1);//inter are always full blocks
1125             if(s->swap_uv){
1126                 exchange_uv(s);
1127             }
1128         }
1129 #endif
1130
1131         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1132             for(i=0;i<4+(1<<s->chroma_format);i++) {
1133                 if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1134                     return -1;
1135             }
1136         } else {
1137             for(i=0;i<6;i++) {
1138                 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1139                     return -1;
1140             }
1141         }
1142     } else {
1143         if (mb_type & MB_TYPE_ZERO_MV){
1144             assert(mb_type & MB_TYPE_CBP);
1145
1146             /* compute dct type */
1147             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1148                 !s->frame_pred_frame_dct) {
1149                 s->interlaced_dct = get_bits1(&s->gb);
1150             }
1151
1152             if (IS_QUANT(mb_type))
1153                 s->qscale = get_qscale(s);
1154
1155             s->mv_dir = MV_DIR_FORWARD;
1156             if(s->picture_structure == PICT_FRAME)
1157                 s->mv_type = MV_TYPE_16X16;
1158             else{
1159                 s->mv_type = MV_TYPE_FIELD;
1160                 mb_type |= MB_TYPE_INTERLACED;
1161                 s->field_select[0][0]= s->picture_structure - 1;
1162             }
1163             s->last_mv[0][0][0] = 0;
1164             s->last_mv[0][0][1] = 0;
1165             s->last_mv[0][1][0] = 0;
1166             s->last_mv[0][1][1] = 0;
1167             s->mv[0][0][0] = 0;
1168             s->mv[0][0][1] = 0;
1169         }else{
1170             assert(mb_type & MB_TYPE_L0L1);
1171 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1172             /* get additionnal motion vector type */
1173             if (s->frame_pred_frame_dct)
1174                 motion_type = MT_FRAME;
1175             else{
1176                 motion_type = get_bits(&s->gb, 2);
1177             }
1178
1179             /* compute dct type */
1180             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1181                 !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1182                 s->interlaced_dct = get_bits1(&s->gb);
1183             }
1184
1185             if (IS_QUANT(mb_type))
1186                 s->qscale = get_qscale(s);
1187
1188             /* motion vectors */
1189             s->mv_dir = 0;
1190             for(i=0;i<2;i++) {
1191                 if (USES_LIST(mb_type, i)) {
1192                     s->mv_dir |= (MV_DIR_FORWARD >> i);
1193                     dprintf("motion_type=%d\n", motion_type);
1194                     switch(motion_type) {
1195                     case MT_FRAME: /* or MT_16X8 */
1196                         if (s->picture_structure == PICT_FRAME) {
1197                             /* MT_FRAME */
1198                             mb_type |= MB_TYPE_16x16;
1199                             s->mv_type = MV_TYPE_16X16;
1200                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1201                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1202                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1203                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1204                             /* full_pel: only for mpeg1 */
1205                             if (s->full_pel[i]){
1206                                 s->mv[i][0][0] <<= 1;
1207                                 s->mv[i][0][1] <<= 1;
1208                             }
1209                         } else {
1210                             /* MT_16X8 */
1211                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1212                             s->mv_type = MV_TYPE_16X8;
1213                             for(j=0;j<2;j++) {
1214                                 s->field_select[i][j] = get_bits1(&s->gb);
1215                                 for(k=0;k<2;k++) {
1216                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1217                                                              s->last_mv[i][j][k]);
1218                                     s->last_mv[i][j][k] = val;
1219                                     s->mv[i][j][k] = val;
1220                                 }
1221                             }
1222                         }
1223                         break;
1224                     case MT_FIELD:
1225                         s->mv_type = MV_TYPE_FIELD;
1226                         if (s->picture_structure == PICT_FRAME) {
1227                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1228                             for(j=0;j<2;j++) {
1229                                 s->field_select[i][j] = get_bits1(&s->gb);
1230                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1231                                                          s->last_mv[i][j][0]);
1232                                 s->last_mv[i][j][0] = val;
1233                                 s->mv[i][j][0] = val;
1234                                 dprintf("fmx=%d\n", val);
1235                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1236                                                          s->last_mv[i][j][1] >> 1);
1237                                 s->last_mv[i][j][1] = val << 1;
1238                                 s->mv[i][j][1] = val;
1239                                 dprintf("fmy=%d\n", val);
1240                             }
1241                         } else {
1242                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1243                             s->field_select[i][0] = get_bits1(&s->gb);
1244                             for(k=0;k<2;k++) {
1245                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1246                                                          s->last_mv[i][0][k]);
1247                                 s->last_mv[i][0][k] = val;
1248                                 s->last_mv[i][1][k] = val;
1249                                 s->mv[i][0][k] = val;
1250                             }
1251                         }
1252                         break;
1253                     case MT_DMV:
1254                         {
1255                             int dmx, dmy, mx, my, m;
1256
1257                             mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1258                                                     s->last_mv[i][0][0]);
1259                             s->last_mv[i][0][0] = mx;
1260                             s->last_mv[i][1][0] = mx;
1261                             dmx = get_dmv(s);
1262                             my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1263                                                     s->last_mv[i][0][1] >> 1);
1264                             dmy = get_dmv(s);
1265                             s->mv_type = MV_TYPE_DMV;
1266
1267
1268                             s->last_mv[i][0][1] = my<<1;
1269                             s->last_mv[i][1][1] = my<<1;
1270
1271                             s->mv[i][0][0] = mx;
1272                             s->mv[i][0][1] = my;
1273                             s->mv[i][1][0] = mx;//not used
1274                             s->mv[i][1][1] = my;//not used
1275
1276                             if (s->picture_structure == PICT_FRAME) {
1277                                 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1278
1279                                 //m = 1 + 2 * s->top_field_first;
1280                                 m = s->top_field_first ? 1 : 3;
1281
1282                                 /* top -> top pred */
1283                                 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1284                                 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1285                                 m = 4 - m;
1286                                 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1287                                 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1288                             } else {
1289                                 mb_type |= MB_TYPE_16x16;
1290
1291                                 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1292                                 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1293                                 if(s->picture_structure == PICT_TOP_FIELD)
1294                                     s->mv[i][2][1]--;
1295                                 else
1296                                     s->mv[i][2][1]++;
1297                             }
1298                         }
1299                         break;
1300                     default:
1301                         av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1302                         return -1;
1303                     }
1304                 }
1305             }
1306         }
1307
1308         s->mb_intra = 0;
1309
1310         if (HAS_CBP(mb_type)) {
1311             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1312             if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1313                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1314                 return -1;
1315             }
1316             if(s->chroma_format == 2){//CHROMA422
1317                  cbp|= ( get_bits(&s->gb,2) ) << 6;
1318             }else
1319             if(s->chroma_format >  2){//CHROMA444
1320                  cbp|= ( get_bits(&s->gb,6) ) << 6;
1321             }
1322
1323 #ifdef HAVE_XVMC
1324             //on 1 we memcpy blocks in xvmcvideo
1325             if(s->avctx->xvmc_acceleration > 1){
1326                 XVMC_pack_pblocks(s,cbp);
1327                 if(s->swap_uv){
1328                     exchange_uv(s);
1329                 }
1330             }
1331 #endif
1332
1333             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1334                 for(i=0;i<6;i++) {
1335                     if (cbp & (1<<(5-i)) ) {
1336                         if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1337                             return -1;
1338                     } else {
1339                         s->block_last_index[i] = -1;
1340                     }
1341                 }
1342                 if (s->chroma_format >= 2) {
1343                     if (s->chroma_format == 2) {//CHROMA_422)
1344                         for(i=6;i<8;i++) {
1345                             if (cbp & (1<<(6+7-i)) ) {
1346                                 if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1347                                     return -1;
1348                             } else {
1349                                 s->block_last_index[i] = -1;
1350                             }
1351                         }
1352                     }else{ /*CHROMA_444*/
1353                         for(i=6;i<12;i++) {
1354                             if (cbp & (1<<(6+11-i)) ) {
1355                                 if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1356                                     return -1;
1357                             } else {
1358                                 s->block_last_index[i] = -1;
1359                             }
1360                         }
1361                     }
1362                 }
1363             } else {
1364                 for(i=0;i<6;i++) {
1365                     if (cbp & 32) {
1366                         if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1367                             return -1;
1368                     } else {
1369                         s->block_last_index[i] = -1;
1370                     }
1371                     cbp+=cbp;
1372                 }
1373             }
1374         }else{
1375             for(i=0;i<6;i++)
1376                 s->block_last_index[i] = -1;
1377         }
1378     }
1379
1380     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1381
1382     return 0;
1383 }
1384
1385 /* as h263, but only 17 codes */
1386 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1387 {
1388     int code, sign, val, l, shift;
1389
1390     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1391     if (code == 0) {
1392         return pred;
1393     }
1394     if (code < 0) {
1395         return 0xffff;
1396     }
1397
1398     sign = get_bits1(&s->gb);
1399     shift = fcode - 1;
1400     val = code;
1401     if (shift) {
1402         val = (val - 1) << shift;
1403         val |= get_bits(&s->gb, shift);
1404         val++;
1405     }
1406     if (sign)
1407         val = -val;
1408     val += pred;
1409
1410     /* modulo decoding */
1411     l = 1 << (shift+4);
1412     val = ((val + l)&(l*2-1)) - l;
1413     return val;
1414 }
1415
1416 static inline int decode_dc(GetBitContext *gb, int component)
1417 {
1418     int code, diff;
1419
1420     if (component == 0) {
1421         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1422     } else {
1423         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1424     }
1425     if (code < 0){
1426         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1427         return 0xffff;
1428     }
1429     if (code == 0) {
1430         diff = 0;
1431     } else {
1432         diff = get_xbits(gb, code);
1433     }
1434     return diff;
1435 }
1436
1437 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1438                                DCTELEM *block,
1439                                int n)
1440 {
1441     int level, dc, diff, i, j, run;
1442     int component;
1443     RLTable *rl = &rl_mpeg1;
1444     uint8_t * const scantable= s->intra_scantable.permutated;
1445     const uint16_t *quant_matrix= s->intra_matrix;
1446     const int qscale= s->qscale;
1447
1448     /* DC coef */
1449     component = (n <= 3 ? 0 : n - 4 + 1);
1450     diff = decode_dc(&s->gb, component);
1451     if (diff >= 0xffff)
1452         return -1;
1453     dc = s->last_dc[component];
1454     dc += diff;
1455     s->last_dc[component] = dc;
1456     block[0] = dc<<3;
1457     dprintf("dc=%d diff=%d\n", dc, diff);
1458     i = 0;
1459     {
1460         OPEN_READER(re, &s->gb);
1461         /* now quantify & encode AC coefs */
1462         for(;;) {
1463             UPDATE_CACHE(re, &s->gb);
1464             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1465
1466             if(level == 127){
1467                 break;
1468             } else if(level != 0) {
1469                 i += run;
1470                 j = scantable[i];
1471                 level= (level*qscale*quant_matrix[j])>>4;
1472                 level= (level-1)|1;
1473                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1474                 LAST_SKIP_BITS(re, &s->gb, 1);
1475             } else {
1476                 /* escape */
1477                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1478                 UPDATE_CACHE(re, &s->gb);
1479                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1480                 if (level == -128) {
1481                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1482                 } else if (level == 0) {
1483                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1484                 }
1485                 i += run;
1486                 j = scantable[i];
1487                 if(level<0){
1488                     level= -level;
1489                     level= (level*qscale*quant_matrix[j])>>4;
1490                     level= (level-1)|1;
1491                     level= -level;
1492                 }else{
1493                     level= (level*qscale*quant_matrix[j])>>4;
1494                     level= (level-1)|1;
1495                 }
1496             }
1497             if (i > 63){
1498                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1499                 return -1;
1500             }
1501
1502             block[j] = level;
1503         }
1504         CLOSE_READER(re, &s->gb);
1505     }
1506     s->block_last_index[n] = i;
1507    return 0;
1508 }
1509
1510 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1511                                DCTELEM *block,
1512                                int n)
1513 {
1514     int level, i, j, run;
1515     RLTable *rl = &rl_mpeg1;
1516     uint8_t * const scantable= s->intra_scantable.permutated;
1517     const uint16_t *quant_matrix= s->inter_matrix;
1518     const int qscale= s->qscale;
1519
1520     {
1521         int v;
1522         OPEN_READER(re, &s->gb);
1523         i = -1;
1524         /* special case for the first coef. no need to add a second vlc table */
1525         UPDATE_CACHE(re, &s->gb);
1526         v= SHOW_UBITS(re, &s->gb, 2);
1527         if (v & 2) {
1528             LAST_SKIP_BITS(re, &s->gb, 2);
1529             level= (3*qscale*quant_matrix[0])>>5;
1530             level= (level-1)|1;
1531             if(v&1)
1532                 level= -level;
1533             block[0] = level;
1534             i++;
1535         }
1536
1537         /* now quantify & encode AC coefs */
1538         for(;;) {
1539             UPDATE_CACHE(re, &s->gb);
1540             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1541
1542             if(level == 127){
1543                 break;
1544             } else if(level != 0) {
1545                 i += run;
1546                 j = scantable[i];
1547                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1548                 level= (level-1)|1;
1549                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1550                 LAST_SKIP_BITS(re, &s->gb, 1);
1551             } else {
1552                 /* escape */
1553                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1554                 UPDATE_CACHE(re, &s->gb);
1555                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1556                 if (level == -128) {
1557                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1558                 } else if (level == 0) {
1559                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1560                 }
1561                 i += run;
1562                 j = scantable[i];
1563                 if(level<0){
1564                     level= -level;
1565                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1566                     level= (level-1)|1;
1567                     level= -level;
1568                 }else{
1569                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1570                     level= (level-1)|1;
1571                 }
1572             }
1573             if (i > 63){
1574                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1575                 return -1;
1576             }
1577
1578             block[j] = level;
1579         }
1580         CLOSE_READER(re, &s->gb);
1581     }
1582     s->block_last_index[n] = i;
1583     return 0;
1584 }
1585
1586 /* Also does unquantization here, since I will never support mpeg2
1587    encoding */
1588 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1589                                DCTELEM *block,
1590                                int n)
1591 {
1592     int level, i, j, run;
1593     RLTable *rl = &rl_mpeg1;
1594     uint8_t * const scantable= s->intra_scantable.permutated;
1595     const uint16_t *quant_matrix;
1596     const int qscale= s->qscale;
1597     int mismatch;
1598
1599     mismatch = 1;
1600
1601     {
1602         int v;
1603         OPEN_READER(re, &s->gb);
1604         i = -1;
1605         if (n < 4)
1606             quant_matrix = s->inter_matrix;
1607         else
1608             quant_matrix = s->chroma_inter_matrix;
1609
1610         /* special case for the first coef. no need to add a second vlc table */
1611         UPDATE_CACHE(re, &s->gb);
1612         v= SHOW_UBITS(re, &s->gb, 2);
1613         if (v & 2) {
1614             LAST_SKIP_BITS(re, &s->gb, 2);
1615             level= (3*qscale*quant_matrix[0])>>5;
1616             if(v&1)
1617                 level= -level;
1618             block[0] = level;
1619             mismatch ^= level;
1620             i++;
1621         }
1622
1623         /* now quantify & encode AC coefs */
1624         for(;;) {
1625             UPDATE_CACHE(re, &s->gb);
1626             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1627
1628             if(level == 127){
1629                 break;
1630             } else if(level != 0) {
1631                 i += run;
1632                 j = scantable[i];
1633                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1634                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1635                 LAST_SKIP_BITS(re, &s->gb, 1);
1636             } else {
1637                 /* escape */
1638                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1639                 UPDATE_CACHE(re, &s->gb);
1640                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1641
1642                 i += run;
1643                 j = scantable[i];
1644                 if(level<0){
1645                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1646                     level= -level;
1647                 }else{
1648                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1649                 }
1650             }
1651             if (i > 63){
1652                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1653                 return -1;
1654             }
1655
1656             mismatch ^= level;
1657             block[j] = level;
1658         }
1659         CLOSE_READER(re, &s->gb);
1660     }
1661     block[63] ^= (mismatch & 1);
1662
1663     s->block_last_index[n] = i;
1664     return 0;
1665 }
1666
1667 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1668                                DCTELEM *block,
1669                                int n)
1670 {
1671     int level, dc, diff, i, j, run;
1672     int component;
1673     RLTable *rl;
1674     uint8_t * const scantable= s->intra_scantable.permutated;
1675     const uint16_t *quant_matrix;
1676     const int qscale= s->qscale;
1677     int mismatch;
1678
1679     /* DC coef */
1680     if (n < 4){
1681         quant_matrix = s->intra_matrix;
1682         component = 0;
1683     }else{
1684         quant_matrix = s->chroma_intra_matrix;
1685         component = (n&1) + 1;
1686     }
1687     diff = decode_dc(&s->gb, component);
1688     if (diff >= 0xffff)
1689         return -1;
1690     dc = s->last_dc[component];
1691     dc += diff;
1692     s->last_dc[component] = dc;
1693     block[0] = dc << (3 - s->intra_dc_precision);
1694     dprintf("dc=%d\n", block[0]);
1695     mismatch = block[0] ^ 1;
1696     i = 0;
1697     if (s->intra_vlc_format)
1698         rl = &rl_mpeg2;
1699     else
1700         rl = &rl_mpeg1;
1701
1702     {
1703         OPEN_READER(re, &s->gb);
1704         /* now quantify & encode AC coefs */
1705         for(;;) {
1706             UPDATE_CACHE(re, &s->gb);
1707             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1708
1709             if(level == 127){
1710                 break;
1711             } else if(level != 0) {
1712                 i += run;
1713                 j = scantable[i];
1714                 level= (level*qscale*quant_matrix[j])>>4;
1715                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1716                 LAST_SKIP_BITS(re, &s->gb, 1);
1717             } else {
1718                 /* escape */
1719                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1720                 UPDATE_CACHE(re, &s->gb);
1721                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1722                 i += run;
1723                 j = scantable[i];
1724                 if(level<0){
1725                     level= (-level*qscale*quant_matrix[j])>>4;
1726                     level= -level;
1727                 }else{
1728                     level= (level*qscale*quant_matrix[j])>>4;
1729                 }
1730             }
1731             if (i > 63){
1732                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1733                 return -1;
1734             }
1735
1736             mismatch^= level;
1737             block[j] = level;
1738         }
1739         CLOSE_READER(re, &s->gb);
1740     }
1741     block[63]^= mismatch&1;
1742
1743     s->block_last_index[n] = i;
1744     return 0;
1745 }
1746
1747 typedef struct Mpeg1Context {
1748     MpegEncContext mpeg_enc_ctx;
1749     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1750     int repeat_field; /* true if we must repeat the field */
1751     AVPanScan pan_scan; /** some temporary storage for the panscan */
1752     int slice_count;
1753     int swap_uv;//indicate VCR2
1754     int save_aspect_info;
1755
1756 } Mpeg1Context;
1757
1758 static int mpeg_decode_init(AVCodecContext *avctx)
1759 {
1760     Mpeg1Context *s = avctx->priv_data;
1761     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1762     int i;
1763
1764     //we need some parmutation to store
1765     //matrixes, until MPV_common_init()
1766     //set the real permutatuon
1767     for(i=0;i<64;i++)
1768        s2->dsp.idct_permutation[i]=i;
1769
1770     MPV_decode_defaults(s2);
1771
1772     s->mpeg_enc_ctx.avctx= avctx;
1773     s->mpeg_enc_ctx.flags= avctx->flags;
1774     s->mpeg_enc_ctx.flags2= avctx->flags2;
1775     common_init(&s->mpeg_enc_ctx);
1776     init_vlcs();
1777
1778     s->mpeg_enc_ctx_allocated = 0;
1779     s->mpeg_enc_ctx.picture_number = 0;
1780     s->repeat_field = 0;
1781     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1782     return 0;
1783 }
1784
1785 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1786                                      const uint8_t *new_perm){
1787 uint16_t temp_matrix[64];
1788 int i;
1789
1790     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1791
1792     for(i=0;i<64;i++){
1793         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1794     }
1795 }
1796
1797 //Call this function when we know all parameters
1798 //it may be called in different places for mpeg1 and mpeg2
1799 static int mpeg_decode_postinit(AVCodecContext *avctx){
1800 Mpeg1Context *s1 = avctx->priv_data;
1801 MpegEncContext *s = &s1->mpeg_enc_ctx;
1802 uint8_t old_permutation[64];
1803
1804
1805     if (
1806         (s1->mpeg_enc_ctx_allocated == 0)||
1807         avctx->width  != s->width ||
1808         avctx->height != s->height||
1809 //      s1->save_aspect_info != avctx->aspect_ratio_info||
1810         0)
1811     {
1812
1813         if (s1->mpeg_enc_ctx_allocated) {
1814             MPV_common_end(s);
1815         }
1816
1817         if( (s->width == 0 )||(s->height == 0))
1818             return -2;
1819
1820         avctx->width = s->width;
1821         avctx->height = s->height;
1822         avctx->bit_rate = s->bit_rate;
1823         s1->save_aspect_info = s->aspect_ratio_info;
1824
1825      //low_delay may be forced, in this case we will have B frames
1826      //that behave like P frames
1827         avctx->has_b_frames = !(s->low_delay);
1828
1829         if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1830             //mpeg1 fps
1831             avctx->frame_rate     = frame_rate_tab[s->frame_rate_index].num;
1832             avctx->frame_rate_base= frame_rate_tab[s->frame_rate_index].den;
1833             //mpeg1 aspect
1834             avctx->sample_aspect_ratio= av_d2q(
1835                     1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
1836
1837         }else{//mpeg2
1838         //mpeg2 fps
1839             av_reduce(
1840                 &s->avctx->frame_rate,
1841                 &s->avctx->frame_rate_base,
1842                 frame_rate_tab[s->frame_rate_index].num * (s->frame_rate_ext_n+1),
1843                 frame_rate_tab[s->frame_rate_index].den * (s->frame_rate_ext_d+1),
1844                 1<<30);
1845         //mpeg2 aspect
1846             if(s->aspect_ratio_info > 1){
1847                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
1848                     s->avctx->sample_aspect_ratio=
1849                         av_div_q(
1850                          mpeg2_aspect[s->aspect_ratio_info],
1851                          (AVRational){s->width, s->height}
1852                          );
1853                 }else{
1854                     s->avctx->sample_aspect_ratio=
1855                         av_div_q(
1856                          mpeg2_aspect[s->aspect_ratio_info],
1857                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1858                         );
1859                 }
1860             }else{
1861                 s->avctx->sample_aspect_ratio=
1862                     mpeg2_aspect[s->aspect_ratio_info];
1863             }
1864         }//mpeg2
1865
1866         if(avctx->xvmc_acceleration){
1867             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1868         }else{
1869             if(s->chroma_format <  2){
1870                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
1871             }else
1872             if(s->chroma_format == 2){
1873                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
1874             }else
1875             if(s->chroma_format >  2){
1876                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
1877             }
1878         }
1879         //until then pix_fmt may be changed right after codec init
1880         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1881             if( avctx->idct_algo == FF_IDCT_AUTO )
1882                 avctx->idct_algo = FF_IDCT_SIMPLE;
1883
1884         //quantization matrixes may need reordering
1885         //if dct permutation is changed
1886         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1887
1888         if (MPV_common_init(s) < 0)
1889             return -2;
1890
1891         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1892         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1893         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1894         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1895
1896         s1->mpeg_enc_ctx_allocated = 1;
1897     }
1898     return 0;
1899 }
1900
1901 /* return the 8 bit start code value and update the search
1902    state. Return -1 if no start code found */
1903 static int find_start_code(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1904 {
1905     const uint8_t *buf_ptr= *pbuf_ptr;
1906
1907     buf_ptr++; //gurantees that -1 is within the array
1908     buf_end -= 2; // gurantees that +2 is within the array
1909
1910     while (buf_ptr < buf_end) {
1911         if(*buf_ptr==0){
1912             while(buf_ptr < buf_end && buf_ptr[1]==0)
1913                 buf_ptr++;
1914
1915             if(buf_ptr[-1] == 0 && buf_ptr[1] == 1){
1916                 *pbuf_ptr = buf_ptr+3;
1917                 return buf_ptr[2] + 0x100;
1918             }
1919         }
1920         buf_ptr += 2;
1921     }
1922     buf_end += 2; //undo the hack above
1923
1924     *pbuf_ptr = buf_end;
1925     return -1;
1926 }
1927
1928 static int mpeg1_decode_picture(AVCodecContext *avctx,
1929                                 const uint8_t *buf, int buf_size)
1930 {
1931     Mpeg1Context *s1 = avctx->priv_data;
1932     MpegEncContext *s = &s1->mpeg_enc_ctx;
1933     int ref, f_code, vbv_delay;
1934
1935     if(mpeg_decode_postinit(s->avctx) < 0)
1936        return -2;
1937
1938     init_get_bits(&s->gb, buf, buf_size*8);
1939
1940     ref = get_bits(&s->gb, 10); /* temporal ref */
1941     s->pict_type = get_bits(&s->gb, 3);
1942
1943     vbv_delay= get_bits(&s->gb, 16);
1944     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1945         s->full_pel[0] = get_bits1(&s->gb);
1946         f_code = get_bits(&s->gb, 3);
1947         if (f_code == 0)
1948             return -1;
1949         s->mpeg_f_code[0][0] = f_code;
1950         s->mpeg_f_code[0][1] = f_code;
1951     }
1952     if (s->pict_type == B_TYPE) {
1953         s->full_pel[1] = get_bits1(&s->gb);
1954         f_code = get_bits(&s->gb, 3);
1955         if (f_code == 0)
1956             return -1;
1957         s->mpeg_f_code[1][0] = f_code;
1958         s->mpeg_f_code[1][1] = f_code;
1959     }
1960     s->current_picture.pict_type= s->pict_type;
1961     s->current_picture.key_frame= s->pict_type == I_TYPE;
1962
1963 //    if(avctx->debug & FF_DEBUG_PICT_INFO)
1964 //        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d\n", vbv_delay, ref);
1965
1966     s->y_dc_scale = 8;
1967     s->c_dc_scale = 8;
1968     s->first_slice = 1;
1969     return 0;
1970 }
1971
1972 static void mpeg_decode_sequence_extension(MpegEncContext *s)
1973 {
1974     int horiz_size_ext, vert_size_ext;
1975     int bit_rate_ext;
1976     int level, profile;
1977
1978     skip_bits(&s->gb, 1); /* profil and level esc*/
1979     profile= get_bits(&s->gb, 3);
1980     level= get_bits(&s->gb, 4);
1981     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1982     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1983     horiz_size_ext = get_bits(&s->gb, 2);
1984     vert_size_ext = get_bits(&s->gb, 2);
1985     s->width |= (horiz_size_ext << 12);
1986     s->height |= (vert_size_ext << 12);
1987     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1988     s->bit_rate += (bit_rate_ext << 12) * 400;
1989     skip_bits1(&s->gb); /* marker */
1990     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1991
1992     s->low_delay = get_bits1(&s->gb);
1993     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1994
1995     s->frame_rate_ext_n = get_bits(&s->gb, 2);
1996     s->frame_rate_ext_d = get_bits(&s->gb, 5);
1997
1998     dprintf("sequence extension\n");
1999     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2000     s->avctx->sub_id = 2; /* indicates mpeg2 found */
2001
2002     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2003         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
2004                profile, level, s->avctx->rc_buffer_size, s->bit_rate);
2005
2006 }
2007
2008 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2009 {
2010     MpegEncContext *s= &s1->mpeg_enc_ctx;
2011     int color_description, w, h;
2012
2013     skip_bits(&s->gb, 3); /* video format */
2014     color_description= get_bits1(&s->gb);
2015     if(color_description){
2016         skip_bits(&s->gb, 8); /* color primaries */
2017         skip_bits(&s->gb, 8); /* transfer_characteristics */
2018         skip_bits(&s->gb, 8); /* matrix_coefficients */
2019     }
2020     w= get_bits(&s->gb, 14);
2021     skip_bits(&s->gb, 1); //marker
2022     h= get_bits(&s->gb, 14);
2023     skip_bits(&s->gb, 1); //marker
2024
2025     s1->pan_scan.width= 16*w;
2026     s1->pan_scan.height=16*h;
2027
2028     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2029         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2030 }
2031
2032 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2033 {
2034     MpegEncContext *s= &s1->mpeg_enc_ctx;
2035     int i,nofco;
2036
2037     nofco = 1;
2038     if(s->progressive_sequence){
2039         if(s->repeat_first_field){
2040             nofco++;
2041             if(s->top_field_first)
2042                 nofco++;
2043         }
2044     }else{
2045         if(s->picture_structure == PICT_FRAME){
2046             nofco++;
2047             if(s->repeat_first_field)
2048                 nofco++;
2049         }
2050     }
2051     for(i=0; i<nofco; i++){
2052         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2053         skip_bits(&s->gb, 1); //marker
2054         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2055         skip_bits(&s->gb, 1); //marker
2056     }
2057
2058     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2059         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
2060             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
2061             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
2062             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2063         );
2064 }
2065
2066 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2067 {
2068     int i, v, j;
2069
2070     dprintf("matrix extension\n");
2071
2072     if (get_bits1(&s->gb)) {
2073         for(i=0;i<64;i++) {
2074             v = get_bits(&s->gb, 8);
2075             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2076             s->intra_matrix[j] = v;
2077             s->chroma_intra_matrix[j] = v;
2078         }
2079     }
2080     if (get_bits1(&s->gb)) {
2081         for(i=0;i<64;i++) {
2082             v = get_bits(&s->gb, 8);
2083             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2084             s->inter_matrix[j] = v;
2085             s->chroma_inter_matrix[j] = v;
2086         }
2087     }
2088     if (get_bits1(&s->gb)) {
2089         for(i=0;i<64;i++) {
2090             v = get_bits(&s->gb, 8);
2091             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2092             s->chroma_intra_matrix[j] = v;
2093         }
2094     }
2095     if (get_bits1(&s->gb)) {
2096         for(i=0;i<64;i++) {
2097             v = get_bits(&s->gb, 8);
2098             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2099             s->chroma_inter_matrix[j] = v;
2100         }
2101     }
2102 }
2103
2104 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2105 {
2106     s->full_pel[0] = s->full_pel[1] = 0;
2107     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2108     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2109     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2110     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2111     s->intra_dc_precision = get_bits(&s->gb, 2);
2112     s->picture_structure = get_bits(&s->gb, 2);
2113     s->top_field_first = get_bits1(&s->gb);
2114     s->frame_pred_frame_dct = get_bits1(&s->gb);
2115     s->concealment_motion_vectors = get_bits1(&s->gb);
2116     s->q_scale_type = get_bits1(&s->gb);
2117     s->intra_vlc_format = get_bits1(&s->gb);
2118     s->alternate_scan = get_bits1(&s->gb);
2119     s->repeat_first_field = get_bits1(&s->gb);
2120     s->chroma_420_type = get_bits1(&s->gb);
2121     s->progressive_frame = get_bits1(&s->gb);
2122
2123     if(s->picture_structure == PICT_FRAME)
2124         s->first_field=0;
2125     else{
2126         s->first_field ^= 1;
2127         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2128     }
2129
2130     if(s->alternate_scan){
2131         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2132         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2133     }else{
2134         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2135         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2136     }
2137
2138     /* composite display not parsed */
2139     dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
2140     dprintf("picture_structure=%d\n", s->picture_structure);
2141     dprintf("top field first=%d\n", s->top_field_first);
2142     dprintf("repeat first field=%d\n", s->repeat_first_field);
2143     dprintf("conceal=%d\n", s->concealment_motion_vectors);
2144     dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
2145     dprintf("alternate_scan=%d\n", s->alternate_scan);
2146     dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2147     dprintf("progressive_frame=%d\n", s->progressive_frame);
2148 }
2149
2150 static void mpeg_decode_extension(AVCodecContext *avctx,
2151                                   const uint8_t *buf, int buf_size)
2152 {
2153     Mpeg1Context *s1 = avctx->priv_data;
2154     MpegEncContext *s = &s1->mpeg_enc_ctx;
2155     int ext_type;
2156
2157     init_get_bits(&s->gb, buf, buf_size*8);
2158
2159     ext_type = get_bits(&s->gb, 4);
2160     switch(ext_type) {
2161     case 0x1:
2162         mpeg_decode_sequence_extension(s);
2163         break;
2164     case 0x2:
2165         mpeg_decode_sequence_display_extension(s1);
2166         break;
2167     case 0x3:
2168         mpeg_decode_quant_matrix_extension(s);
2169         break;
2170     case 0x7:
2171         mpeg_decode_picture_display_extension(s1);
2172         break;
2173     case 0x8:
2174         mpeg_decode_picture_coding_extension(s);
2175         break;
2176     }
2177 }
2178
2179 static void exchange_uv(MpegEncContext *s){
2180 short * tmp;
2181
2182     tmp = s->pblocks[4];
2183     s->pblocks[4] = s->pblocks[5];
2184     s->pblocks[5] = tmp;
2185 }
2186
2187 static int mpeg_field_start(MpegEncContext *s){
2188     AVCodecContext *avctx= s->avctx;
2189     Mpeg1Context *s1 = (Mpeg1Context*)s;
2190
2191     /* start frame decoding */
2192     if(s->first_field || s->picture_structure==PICT_FRAME){
2193         if(MPV_frame_start(s, avctx) < 0)
2194             return -1;
2195
2196         ff_er_frame_start(s);
2197
2198         /* first check if we must repeat the frame */
2199         s->current_picture_ptr->repeat_pict = 0;
2200         if (s->repeat_first_field) {
2201             if (s->progressive_sequence) {
2202                 if (s->top_field_first)
2203                     s->current_picture_ptr->repeat_pict = 4;
2204                 else
2205                     s->current_picture_ptr->repeat_pict = 2;
2206             } else if (s->progressive_frame) {
2207                 s->current_picture_ptr->repeat_pict = 1;
2208             }
2209         }
2210
2211         *s->current_picture_ptr->pan_scan= s1->pan_scan;
2212     }else{ //second field
2213             int i;
2214
2215             if(!s->current_picture_ptr){
2216                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2217                 return -1;
2218             }
2219
2220             for(i=0; i<4; i++){
2221                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
2222                 if(s->picture_structure == PICT_BOTTOM_FIELD){
2223                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2224                 }
2225             }
2226     }
2227 #ifdef HAVE_XVMC
2228 // MPV_frame_start will call this function too,
2229 // but we need to call it on every field
2230     if(s->avctx->xvmc_acceleration)
2231          XVMC_field_start(s,avctx);
2232 #endif
2233
2234     return 0;
2235 }
2236
2237 #define DECODE_SLICE_ERROR -1
2238 #define DECODE_SLICE_OK 0
2239
2240 /**
2241  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2242  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2243  *         DECODE_SLICE_OK if this slice is ok<br>
2244  */
2245 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2246                              const uint8_t **buf, int buf_size)
2247 {
2248     MpegEncContext *s = &s1->mpeg_enc_ctx;
2249     AVCodecContext *avctx= s->avctx;
2250     int ret;
2251     const int field_pic= s->picture_structure != PICT_FRAME;
2252
2253     s->resync_mb_x=
2254     s->resync_mb_y= -1;
2255
2256     if (mb_y<<field_pic >= s->mb_height){
2257         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2258         return -1;
2259     }
2260
2261     init_get_bits(&s->gb, *buf, buf_size*8);
2262
2263     ff_mpeg1_clean_buffers(s);
2264     s->interlaced_dct = 0;
2265
2266     s->qscale = get_qscale(s);
2267
2268     if(s->qscale == 0){
2269         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2270         return -1;
2271     }
2272
2273     /* extra slice info */
2274     while (get_bits1(&s->gb) != 0) {
2275         skip_bits(&s->gb, 8);
2276     }
2277
2278     s->mb_x=0;
2279
2280     for(;;) {
2281         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2282         if (code < 0){
2283             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2284             return -1;
2285         }
2286         if (code >= 33) {
2287             if (code == 33) {
2288                 s->mb_x += 33;
2289             }
2290             /* otherwise, stuffing, nothing to do */
2291         } else {
2292             s->mb_x += code;
2293             break;
2294         }
2295     }
2296
2297     s->resync_mb_x= s->mb_x;
2298     s->resync_mb_y= s->mb_y= mb_y;
2299     s->mb_skip_run= 0;
2300     ff_init_block_index(s);
2301
2302     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2303         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2304              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",
2305                  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],
2306                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
2307                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
2308                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2309                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2310         }
2311     }
2312
2313     for(;;) {
2314 #ifdef HAVE_XVMC
2315         //one 1 we memcpy blocks in xvmcvideo
2316         if(s->avctx->xvmc_acceleration > 1)
2317             XVMC_init_block(s);//set s->block
2318 #endif
2319
2320         s->dsp.clear_blocks(s->block[0]);
2321
2322         ret = mpeg_decode_mb(s, s->block);
2323         s->chroma_qscale= s->qscale;
2324
2325         dprintf("ret=%d\n", ret);
2326         if (ret < 0)
2327             return -1;
2328
2329         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2330             const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2331             int xy = s->mb_x*2 + s->mb_y*2*wrap;
2332             int motion_x, motion_y, dir, i;
2333             if(field_pic && !s->first_field)
2334                 xy += wrap/2;
2335
2336             for(i=0; i<2; i++){
2337                 for(dir=0; dir<2; dir++){
2338                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2339                         motion_x = motion_y = 0;
2340                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2341                         motion_x = s->mv[dir][0][0];
2342                         motion_y = s->mv[dir][0][1];
2343                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2344                         motion_x = s->mv[dir][i][0];
2345                         motion_y = s->mv[dir][i][1];
2346                     }
2347
2348                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2349                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2350                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2351                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2352                     s->current_picture.ref_index [dir][xy    ]=
2353                     s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2354                 }
2355                 xy += wrap;
2356             }
2357         }
2358
2359         s->dest[0] += 16;
2360         s->dest[1] += 8;
2361         s->dest[2] += 8;
2362
2363         MPV_decode_mb(s, s->block);
2364
2365         if (++s->mb_x >= s->mb_width) {
2366
2367             ff_draw_horiz_band(s, 16*s->mb_y, 16);
2368
2369             s->mb_x = 0;
2370             s->mb_y++;
2371
2372             if(s->mb_y<<field_pic >= s->mb_height){
2373                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2374
2375                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2376                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2377                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d\n", left);
2378                     return -1;
2379                 }else
2380                     goto eos;
2381             }
2382
2383             ff_init_block_index(s);
2384         }
2385
2386         /* skip mb handling */
2387         if (s->mb_skip_run == -1) {
2388             /* read again increment */
2389             s->mb_skip_run = 0;
2390             for(;;) {
2391                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2392                 if (code < 0){
2393                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2394                     return -1;
2395                 }
2396                 if (code >= 33) {
2397                     if (code == 33) {
2398                         s->mb_skip_run += 33;
2399                     }else if(code == 35){
2400                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2401                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2402                             return -1;
2403                         }
2404                         goto eos; /* end of slice */
2405                     }
2406                     /* otherwise, stuffing, nothing to do */
2407                 } else {
2408                     s->mb_skip_run += code;
2409                     break;
2410                 }
2411             }
2412         }
2413     }
2414 eos: // end of slice
2415     *buf += get_bits_count(&s->gb)/8 - 1;
2416 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2417     return 0;
2418 }
2419
2420 static int slice_decode_thread(AVCodecContext *c, void *arg){
2421     MpegEncContext *s= arg;
2422     const uint8_t *buf= s->gb.buffer;
2423     int mb_y= s->start_mb_y;
2424
2425     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2426
2427     for(;;){
2428         int start_code, ret;
2429
2430         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2431         emms_c();
2432 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2433 //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);
2434         if(ret < 0){
2435             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2436                 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);
2437         }else{
2438             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);
2439         }
2440
2441         if(s->mb_y == s->end_mb_y)
2442             return 0;
2443
2444         start_code = find_start_code(&buf, s->gb.buffer_end);
2445         mb_y= start_code - SLICE_MIN_START_CODE;
2446         if(mb_y < 0 || mb_y >= s->end_mb_y)
2447             return -1;
2448     }
2449
2450     return 0; //not reached
2451 }
2452
2453 /**
2454  * handles slice ends.
2455  * @return 1 if it seems to be the last slice of
2456  */
2457 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2458 {
2459     Mpeg1Context *s1 = avctx->priv_data;
2460     MpegEncContext *s = &s1->mpeg_enc_ctx;
2461
2462     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2463         return 0;
2464
2465 #ifdef HAVE_XVMC
2466     if(s->avctx->xvmc_acceleration)
2467         XVMC_field_end(s);
2468 #endif
2469     /* end of slice reached */
2470     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2471         /* end of image */
2472
2473         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2474
2475         ff_er_frame_end(s);
2476
2477         MPV_frame_end(s);
2478
2479         if (s->pict_type == B_TYPE || s->low_delay) {
2480             *pict= *(AVFrame*)s->current_picture_ptr;
2481             ff_print_debug_info(s, pict);
2482         } else {
2483             s->picture_number++;
2484             /* latency of 1 frame for I and P frames */
2485             /* XXX: use another variable than picture_number */
2486             if (s->last_picture_ptr != NULL) {
2487                 *pict= *(AVFrame*)s->last_picture_ptr;
2488                  ff_print_debug_info(s, pict);
2489             }
2490         }
2491
2492         return 1;
2493     } else {
2494         return 0;
2495     }
2496 }
2497
2498 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2499                                  const uint8_t *buf, int buf_size)
2500 {
2501     Mpeg1Context *s1 = avctx->priv_data;
2502     MpegEncContext *s = &s1->mpeg_enc_ctx;
2503     int width,height;
2504     int i, v, j;
2505
2506     init_get_bits(&s->gb, buf, buf_size*8);
2507
2508     width = get_bits(&s->gb, 12);
2509     height = get_bits(&s->gb, 12);
2510     if (width <= 0 || height <= 0 ||
2511         (width % 2) != 0 || (height % 2) != 0)
2512         return -1;
2513     s->aspect_ratio_info= get_bits(&s->gb, 4);
2514     if (s->aspect_ratio_info == 0)
2515         return -1;
2516     s->frame_rate_index = get_bits(&s->gb, 4);
2517     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2518         return -1;
2519     s->bit_rate = get_bits(&s->gb, 18) * 400;
2520     if (get_bits1(&s->gb) == 0) /* marker */
2521         return -1;
2522     s->width = width;
2523     s->height = height;
2524
2525     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2526     skip_bits(&s->gb, 1);
2527
2528     /* get matrix */
2529     if (get_bits1(&s->gb)) {
2530         for(i=0;i<64;i++) {
2531             v = get_bits(&s->gb, 8);
2532             if(v==0){
2533                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2534                 return -1;
2535             }
2536             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2537             s->intra_matrix[j] = v;
2538             s->chroma_intra_matrix[j] = v;
2539         }
2540 #ifdef DEBUG
2541         dprintf("intra matrix present\n");
2542         for(i=0;i<64;i++)
2543             dprintf(" %d", s->intra_matrix[s->dsp.idct_permutation[i]);
2544         printf("\n");
2545 #endif
2546     } else {
2547         for(i=0;i<64;i++) {
2548             j = s->dsp.idct_permutation[i];
2549             v = ff_mpeg1_default_intra_matrix[i];
2550             s->intra_matrix[j] = v;
2551             s->chroma_intra_matrix[j] = v;
2552         }
2553     }
2554     if (get_bits1(&s->gb)) {
2555         for(i=0;i<64;i++) {
2556             v = get_bits(&s->gb, 8);
2557             if(v==0){
2558                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2559                 return -1;
2560             }
2561             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2562             s->inter_matrix[j] = v;
2563             s->chroma_inter_matrix[j] = v;
2564         }
2565 #ifdef DEBUG
2566         dprintf("non intra matrix present\n");
2567         for(i=0;i<64;i++)
2568             dprintf(" %d", s->inter_matrix[s->dsp.idct_permutation[i]);
2569         printf("\n");
2570 #endif
2571     } else {
2572         for(i=0;i<64;i++) {
2573             int j= s->dsp.idct_permutation[i];
2574             v = ff_mpeg1_default_non_intra_matrix[i];
2575             s->inter_matrix[j] = v;
2576             s->chroma_inter_matrix[j] = v;
2577         }
2578     }
2579
2580     if(show_bits(&s->gb, 23) != 0){
2581         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2582         return -1;
2583     }
2584
2585     /* we set mpeg2 parameters so that it emulates mpeg1 */
2586     s->progressive_sequence = 1;
2587     s->progressive_frame = 1;
2588     s->picture_structure = PICT_FRAME;
2589     s->frame_pred_frame_dct = 1;
2590     s->chroma_format = 1;
2591     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2592     avctx->sub_id = 1; /* indicates mpeg1 */
2593     s->out_format = FMT_MPEG1;
2594     s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2595     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2596
2597     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2598         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2599                s->avctx->rc_buffer_size, s->bit_rate);
2600
2601     return 0;
2602 }
2603
2604 static int vcr2_init_sequence(AVCodecContext *avctx)
2605 {
2606     Mpeg1Context *s1 = avctx->priv_data;
2607     MpegEncContext *s = &s1->mpeg_enc_ctx;
2608     int i, v;
2609
2610     /* start new mpeg1 context decoding */
2611     s->out_format = FMT_MPEG1;
2612     if (s1->mpeg_enc_ctx_allocated) {
2613         MPV_common_end(s);
2614     }
2615     s->width = avctx->width;
2616     s->height = avctx->height;
2617     avctx->has_b_frames= 0; //true?
2618     s->low_delay= 1;
2619
2620     if(avctx->xvmc_acceleration){
2621         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2622     }else{
2623         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2624     }
2625
2626     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2627         if( avctx->idct_algo == FF_IDCT_AUTO )
2628             avctx->idct_algo = FF_IDCT_SIMPLE;
2629
2630     if (MPV_common_init(s) < 0)
2631         return -1;
2632     exchange_uv(s);//common init reset pblocks, so we swap them here
2633     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2634     s1->mpeg_enc_ctx_allocated = 1;
2635
2636     for(i=0;i<64;i++) {
2637         int j= s->dsp.idct_permutation[i];
2638         v = ff_mpeg1_default_intra_matrix[i];
2639         s->intra_matrix[j] = v;
2640         s->chroma_intra_matrix[j] = v;
2641
2642         v = ff_mpeg1_default_non_intra_matrix[i];
2643         s->inter_matrix[j] = v;
2644         s->chroma_inter_matrix[j] = v;
2645     }
2646
2647     s->progressive_sequence = 1;
2648     s->progressive_frame = 1;
2649     s->picture_structure = PICT_FRAME;
2650     s->frame_pred_frame_dct = 1;
2651     s->chroma_format = 1;
2652     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2653     avctx->sub_id = 2; /* indicates mpeg2 */
2654     return 0;
2655 }
2656
2657
2658 static void mpeg_decode_user_data(AVCodecContext *avctx,
2659                                   const uint8_t *buf, int buf_size)
2660 {
2661     const uint8_t *p;
2662     int len, flags;
2663     p = buf;
2664     len = buf_size;
2665
2666     /* we parse the DTG active format information */
2667     if (len >= 5 &&
2668         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2669         flags = p[4];
2670         p += 5;
2671         len -= 5;
2672         if (flags & 0x80) {
2673             /* skip event id */
2674             if (len < 2)
2675                 return;
2676             p += 2;
2677             len -= 2;
2678         }
2679         if (flags & 0x40) {
2680             if (len < 1)
2681                 return;
2682             avctx->dtg_active_format = p[0] & 0x0f;
2683         }
2684     }
2685 }
2686
2687 static void mpeg_decode_gop(AVCodecContext *avctx,
2688                             const uint8_t *buf, int buf_size){
2689     Mpeg1Context *s1 = avctx->priv_data;
2690     MpegEncContext *s = &s1->mpeg_enc_ctx;
2691
2692     int drop_frame_flag;
2693     int time_code_hours, time_code_minutes;
2694     int time_code_seconds, time_code_pictures;
2695     int broken_link;
2696
2697     init_get_bits(&s->gb, buf, buf_size*8);
2698
2699     drop_frame_flag = get_bits1(&s->gb);
2700
2701     time_code_hours=get_bits(&s->gb,5);
2702     time_code_minutes = get_bits(&s->gb,6);
2703     skip_bits1(&s->gb);//marker bit
2704     time_code_seconds = get_bits(&s->gb,6);
2705     time_code_pictures = get_bits(&s->gb,6);
2706
2707     /*broken_link indicate that after editing the
2708       reference frames of the first B-Frames after GOP I-Frame
2709       are missing (open gop)*/
2710     broken_link = get_bits1(&s->gb);
2711
2712     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2713         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2714             time_code_hours, time_code_minutes, time_code_seconds,
2715             time_code_pictures, broken_link);
2716 }
2717 /**
2718  * finds the end of the current frame in the bitstream.
2719  * @return the position of the first byte of the next frame, or -1
2720  */
2721 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2722 {
2723     int i;
2724     uint32_t state;
2725
2726     state= pc->state;
2727
2728     i=0;
2729     if(!pc->frame_start_found){
2730         for(i=0; i<buf_size; i++){
2731             state= (state<<8) | buf[i];
2732             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2733                 i++;
2734                 pc->frame_start_found=1;
2735                 break;
2736             }
2737         }
2738     }
2739
2740     if(pc->frame_start_found){
2741         /* EOF considered as end of frame */
2742         if (buf_size == 0)
2743             return 0;
2744         for(; i<buf_size; i++){
2745             state= (state<<8) | buf[i];
2746             if((state&0xFFFFFF00) == 0x100){
2747                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2748                     pc->frame_start_found=0;
2749                     pc->state=-1;
2750                     return i-3;
2751                 }
2752             }
2753         }
2754     }
2755     pc->state= state;
2756     return END_NOT_FOUND;
2757 }
2758
2759 /* handle buffering and image synchronisation */
2760 static int mpeg_decode_frame(AVCodecContext *avctx,
2761                              void *data, int *data_size,
2762                              uint8_t *buf, int buf_size)
2763 {
2764     Mpeg1Context *s = avctx->priv_data;
2765     const uint8_t *buf_end;
2766     const uint8_t *buf_ptr;
2767     int ret, start_code, input_size;
2768     AVFrame *picture = data;
2769     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2770     dprintf("fill_buffer\n");
2771
2772     *data_size = 0;
2773
2774     /* special case for last picture */
2775     if (buf_size == 0 && s2->low_delay==0 && s2->next_picture_ptr) {
2776         *picture= *(AVFrame*)s2->next_picture_ptr;
2777         s2->next_picture_ptr= NULL;
2778
2779         *data_size = sizeof(AVFrame);
2780         return 0;
2781     }
2782
2783     if(s2->flags&CODEC_FLAG_TRUNCATED){
2784         int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2785
2786         if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 )
2787             return buf_size;
2788     }
2789
2790     buf_ptr = buf;
2791     buf_end = buf + buf_size;
2792
2793 #if 0
2794     if (s->repeat_field % 2 == 1) {
2795         s->repeat_field++;
2796         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2797         //        s2->picture_number, s->repeat_field);
2798         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2799             *data_size = sizeof(AVPicture);
2800             goto the_end;
2801         }
2802     }
2803 #endif
2804
2805     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2806         vcr2_init_sequence(avctx);
2807
2808     s->slice_count= 0;
2809
2810     for(;;) {
2811         /* find start next code */
2812         start_code = find_start_code(&buf_ptr, buf_end);
2813         if (start_code < 0){
2814             if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
2815                 if(avctx->thread_count > 1){
2816                     int i;
2817
2818                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2819                     for(i=0; i<s->slice_count; i++)
2820                         s2->error_count += s2->thread_context[i]->error_count;
2821                 }
2822                 if (slice_end(avctx, picture)) {
2823                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2824                         *data_size = sizeof(AVPicture);
2825                 }
2826             }
2827             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2828         }
2829
2830         input_size = buf_end - buf_ptr;
2831
2832         if(avctx->debug & FF_DEBUG_STARTCODE){
2833             av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
2834         }
2835
2836                 /* prepare data for next start code */
2837                 switch(start_code) {
2838                 case SEQ_START_CODE:
2839                     mpeg1_decode_sequence(avctx, buf_ptr,
2840                                           input_size);
2841                     break;
2842
2843                 case PICTURE_START_CODE:
2844                     /* we have a complete image : we try to decompress it */
2845                     mpeg1_decode_picture(avctx,
2846                                          buf_ptr, input_size);
2847                     break;
2848                 case EXT_START_CODE:
2849                     mpeg_decode_extension(avctx,
2850                                           buf_ptr, input_size);
2851                     break;
2852                 case USER_START_CODE:
2853                     mpeg_decode_user_data(avctx,
2854                                           buf_ptr, input_size);
2855                     break;
2856                 case GOP_START_CODE:
2857                     s2->first_field=0;
2858                     mpeg_decode_gop(avctx,
2859                                           buf_ptr, input_size);
2860                     break;
2861                 default:
2862                     if (start_code >= SLICE_MIN_START_CODE &&
2863                         start_code <= SLICE_MAX_START_CODE) {
2864                         int mb_y= start_code - SLICE_MIN_START_CODE;
2865
2866                         /* skip b frames if we dont have reference frames */
2867                         if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2868                         /* skip b frames if we are in a hurry */
2869                         if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2870                         /* skip everything if we are in a hurry>=5 */
2871                         if(avctx->hurry_up>=5) break;
2872
2873                         if (!s->mpeg_enc_ctx_allocated) break;
2874
2875                         if(s2->first_slice){
2876                             s2->first_slice=0;
2877                             if(mpeg_field_start(s2) < 0)
2878                                 return -1;
2879                         }
2880
2881                         if(avctx->thread_count > 1){
2882                             int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2883                             if(threshold <= mb_y){
2884                                 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2885
2886                                 thread_context->start_mb_y= mb_y;
2887                                 thread_context->end_mb_y  = s2->mb_height;
2888                                 if(s->slice_count){
2889                                     s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2890                                     ff_update_duplicate_context(thread_context, s2);
2891                                 }
2892                                 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2893                                 s->slice_count++;
2894                             }
2895                             buf_ptr += 2; //FIXME add minimum num of bytes per slice
2896                         }else{
2897                             ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2898                             emms_c();
2899
2900                             if(ret < 0){
2901                                 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2902                                     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);
2903                             }else{
2904                                 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);
2905                             }
2906                         }
2907                     }
2908                     break;
2909                 }
2910     }
2911 }
2912
2913 static int mpeg_decode_end(AVCodecContext *avctx)
2914 {
2915     Mpeg1Context *s = avctx->priv_data;
2916
2917     if (s->mpeg_enc_ctx_allocated)
2918         MPV_common_end(&s->mpeg_enc_ctx);
2919     return 0;
2920 }
2921
2922 AVCodec mpeg1video_decoder = {
2923     "mpeg1video",
2924     CODEC_TYPE_VIDEO,
2925     CODEC_ID_MPEG1VIDEO,
2926     sizeof(Mpeg1Context),
2927     mpeg_decode_init,
2928     NULL,
2929     mpeg_decode_end,
2930     mpeg_decode_frame,
2931     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2932     .flush= ff_mpeg_flush,
2933 };
2934
2935 AVCodec mpeg2video_decoder = {
2936     "mpeg2video",
2937     CODEC_TYPE_VIDEO,
2938     CODEC_ID_MPEG2VIDEO,
2939     sizeof(Mpeg1Context),
2940     mpeg_decode_init,
2941     NULL,
2942     mpeg_decode_end,
2943     mpeg_decode_frame,
2944     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2945     .flush= ff_mpeg_flush,
2946 };
2947
2948 //legacy decoder
2949 AVCodec mpegvideo_decoder = {
2950     "mpegvideo",
2951     CODEC_TYPE_VIDEO,
2952     CODEC_ID_MPEG2VIDEO,
2953     sizeof(Mpeg1Context),
2954     mpeg_decode_init,
2955     NULL,
2956     mpeg_decode_end,
2957     mpeg_decode_frame,
2958     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2959     .flush= ff_mpeg_flush,
2960 };
2961
2962 #ifdef CONFIG_ENCODERS
2963
2964 AVCodec mpeg1video_encoder = {
2965     "mpeg1video",
2966     CODEC_TYPE_VIDEO,
2967     CODEC_ID_MPEG1VIDEO,
2968     sizeof(MpegEncContext),
2969     encode_init,
2970     MPV_encode_picture,
2971     MPV_encode_end,
2972     .supported_framerates= frame_rate_tab+1,
2973 };
2974
2975 #ifdef CONFIG_RISKY
2976
2977 AVCodec mpeg2video_encoder = {
2978     "mpeg2video",
2979     CODEC_TYPE_VIDEO,
2980     CODEC_ID_MPEG2VIDEO,
2981     sizeof(MpegEncContext),
2982     encode_init,
2983     MPV_encode_picture,
2984     MPV_encode_end,
2985     .supported_framerates= frame_rate_tab+1,
2986 };
2987 #endif
2988 #endif
2989
2990 #ifdef HAVE_XVMC
2991 static int mpeg_mc_decode_init(AVCodecContext *avctx){
2992     Mpeg1Context *s;
2993
2994     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2995         return -1;
2996     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2997         dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2998     }
2999     mpeg_decode_init(avctx);
3000     s = avctx->priv_data;
3001
3002     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3003     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3004
3005     return 0;
3006 }
3007
3008 AVCodec mpeg_xvmc_decoder = {
3009     "mpegvideo_xvmc",
3010     CODEC_TYPE_VIDEO,
3011     CODEC_ID_MPEG2VIDEO_XVMC,
3012     sizeof(Mpeg1Context),
3013     mpeg_mc_decode_init,
3014     NULL,
3015     mpeg_decode_end,
3016     mpeg_decode_frame,
3017     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL,
3018     .flush= ff_mpeg_flush,
3019 };
3020
3021 #endif
3022
3023 /* this is ugly i know, but the alternative is too make
3024    hundreds of vars global and prefix them with ff_mpeg1_
3025    which is far uglier. */
3026 #include "mdec.c"