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 file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file mpeg12.c
  25  * MPEG1/2 codec
  26  */
  27
  28 //#define DEBUG
  29 #include "avcodec.h"
  30 #include "dsputil.h"
  31 #include "mpegvideo.h"
  32
  33 #include "mpeg12data.h"
  34 #include "bytestream.h"
  35
  36 //#undef NDEBUG
  37 //#include <assert.h>
  38
  39
  40 #define DC_VLC_BITS 9
  41 #define MV_VLC_BITS 9
  42 #define MBINCR_VLC_BITS 9
  43 #define MB_PAT_VLC_BITS 9
  44 #define MB_PTYPE_VLC_BITS 6
  45 #define MB_BTYPE_VLC_BITS 6
  46 #define TEX_VLC_BITS 9
  47
  48 #ifdef CONFIG_ENCODERS
  49 static void mpeg1_encode_block(MpegEncContext *s,
  50                          DCTELEM *block,
  51                          int component);
  52 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
  53 #endif //CONFIG_ENCODERS
  54 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
  55                               DCTELEM *block,
  56                               int n);
  57 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
  58                               DCTELEM *block,
  59                               int n);
  60 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
  61 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
  62                                         DCTELEM *block,
  63                                         int n);
  64 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
  65                                     DCTELEM *block,
  66                                     int n);
  67 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
  68 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
  69 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
  70 static void exchange_uv(MpegEncContext *s);
  71
  72 #ifdef HAVE_XVMC
  73 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
  74 extern int XVMC_field_end(MpegEncContext *s);
  75 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
  76 extern void XVMC_init_block(MpegEncContext *s);//set s->block
  77 #endif
  78
  79 static const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
  80 static const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
  81 static const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
  82 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
  83                                            PIX_FMT_XVMC_MPEG2_IDCT,
  84                                            PIX_FMT_XVMC_MPEG2_MC,
  85                                            -1};
  86 #ifdef CONFIG_ENCODERS
  87 static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
  88 static uint8_t fcode_tab[MAX_MV*2+1];
  89
  90 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
  91 static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
  92
  93 /* simple include everything table for dc, first byte is bits number next 3 are code*/
  94 static uint32_t mpeg1_lum_dc_uni[512];
  95 static uint32_t mpeg1_chr_dc_uni[512];
  96
  97 static uint8_t mpeg1_index_run[2][64];
  98 static int8_t mpeg1_max_level[2][64];
  99 #endif //CONFIG_ENCODERS
 100
 101 static uint8_t static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
 102
 103 static void init_2d_vlc_rl(RLTable *rl, int use_static)
 104 {
 105     int i;
 106
 107     init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
 108              &rl->table_vlc[0][1], 4, 2,
 109              &rl->table_vlc[0][0], 4, 2, use_static);
 110
 111     if(use_static)
 112         rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
 113     else
 114         rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
 115
 116     for(i=0; i<rl->vlc.table_size; i++){
 117         int code= rl->vlc.table[i][0];
 118         int len = rl->vlc.table[i][1];
 119         int level, run;
 120
 121         if(len==0){ // illegal code
 122             run= 65;
 123             level= MAX_LEVEL;
 124         }else if(len<0){ //more bits needed
 125             run= 0;
 126             level= code;
 127         }else{
 128             if(code==rl->n){ //esc
 129                 run= 65;
 130                 level= 0;
 131             }else if(code==rl->n+1){ //eob
 132                 run= 0;
 133                 level= 127;
 134             }else{
 135                 run=   rl->table_run  [code] + 1;
 136                 level= rl->table_level[code];
 137             }
 138         }
 139         rl->rl_vlc[0][i].len= len;
 140         rl->rl_vlc[0][i].level= level;
 141         rl->rl_vlc[0][i].run= run;
 142     }
 143 }
 144
 145 #ifdef CONFIG_ENCODERS
 146 static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
 147     int i;
 148
 149     for(i=0; i<128; i++){
 150         int level= i-64;
 151         int run;
 152         for(run=0; run<64; run++){
 153             int len, bits, code;
 154
 155             int alevel= FFABS(level);
 156             int sign= (level>>31)&1;
 157
 158             if (alevel > rl->max_level[0][run])
 159                 code= 111; /*rl->n*/
 160             else
 161                 code= rl->index_run[0][run] + alevel - 1;
 162
 163             if (code < 111 /* rl->n */) {
 164                 /* store the vlc & sign at once */
 165                 len=   rl->table_vlc[code][1]+1;
 166                 bits= (rl->table_vlc[code][0]<<1) + sign;
 167             } else {
 168                 len=  rl->table_vlc[111/*rl->n*/][1]+6;
 169                 bits= rl->table_vlc[111/*rl->n*/][0]<<6;
 170
 171                 bits|= run;
 172                 if (alevel < 128) {
 173                     bits<<=8; len+=8;
 174                     bits|= level & 0xff;
 175                 } else {
 176                     bits<<=16; len+=16;
 177                     bits|= level & 0xff;
 178                     if (level < 0) {
 179                         bits|= 0x8001 + level + 255;
 180                     } else {
 181                         bits|= level & 0xffff;
 182                     }
 183                 }
 184             }
 185
 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/ff_frame_rate_tab[i].den*ff_frame_rate_tab[i].num*s->avctx->time_base.num;
 199         int64_t n1= 1001LL*s->avctx->time_base.den;
 200         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL && i>=9) break;
 201
 202         d = FFABS(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 > FF_COMPLIANCE_EXPERIMENTAL){
 223             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
 224             return -1;
 225         }else{
 226             av_log(avctx, AV_LOG_INFO, "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n", avctx->time_base.den, avctx->time_base.num);
 227         }
 228     }
 229
 230     if(avctx->profile == FF_PROFILE_UNKNOWN){
 231         if(avctx->level != FF_LEVEL_UNKNOWN){
 232             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 233             return -1;
 234         }
 235         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
 236     }
 237
 238     if(avctx->level == FF_LEVEL_UNKNOWN){
 239         if(avctx->profile == 0){ /* 4:2:2 */
 240             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
 241             else                                            avctx->level = 2; /* High */
 242         }else{
 243             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
 244                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 245                 return -1;
 246             }
 247             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
 248             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
 249             else                                            avctx->level = 4; /* High */
 250         }
 251     }
 252
 253     if((avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) && s->frame_rate_index != 4){
 254         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 255         return -1;
 256     }
 257
 258     return 0;
 259 }
 260
 261 static void put_header(MpegEncContext *s, int header)
 262 {
 263     align_put_bits(&s->pb);
 264     put_bits(&s->pb, 16, header>>16);
 265     put_bits(&s->pb, 16, header&0xFFFF);
 266 }
 267
 268 /* put sequence header if needed */
 269 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 270 {
 271         unsigned int vbv_buffer_size;
 272         unsigned int fps, v;
 273         int i;
 274         uint64_t time_code;
 275         float best_aspect_error= 1E10;
 276         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 277         int constraint_parameter_flag;
 278
 279         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 280
 281         if (s->current_picture.key_frame) {
 282             AVRational framerate= ff_frame_rate_tab[s->frame_rate_index];
 283
 284             /* mpeg1 header repeated every gop */
 285             put_header(s, SEQ_START_CODE);
 286
 287             put_bits(&s->pb, 12, s->width);
 288             put_bits(&s->pb, 12, s->height);
 289
 290             for(i=1; i<15; i++){
 291                 float error= aspect_ratio;
 292                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
 293                     error-= 1.0/mpeg1_aspect[i];
 294                 else
 295                     error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
 296
 297                 error= FFABS(error);
 298
 299                 if(error < best_aspect_error){
 300                     best_aspect_error= error;
 301                     s->aspect_ratio_info= i;
 302                 }
 303             }
 304
 305             put_bits(&s->pb, 4, s->aspect_ratio_info);
 306             put_bits(&s->pb, 4, s->frame_rate_index);
 307
 308             if(s->avctx->rc_max_rate){
 309                 v = (s->avctx->rc_max_rate + 399) / 400;
 310                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
 311                     v = 0x3ffff;
 312             }else{
 313                 v= 0x3FFFF;
 314             }
 315
 316             if(s->avctx->rc_buffer_size)
 317                 vbv_buffer_size = s->avctx->rc_buffer_size;
 318             else
 319                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 320                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 321             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 322
 323             put_bits(&s->pb, 18, v & 0x3FFFF);
 324             put_bits(&s->pb, 1, 1); /* marker */
 325             put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
 326
 327             constraint_parameter_flag=
 328                 s->width <= 768 && s->height <= 576 &&
 329                 s->mb_width * s->mb_height <= 396 &&
 330                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 331                 framerate.num <= framerate.den*30 &&
 332                 s->avctx->me_range && s->avctx->me_range < 128 &&
 333                 vbv_buffer_size <= 20 &&
 334                 v <= 1856000/400 &&
 335                 s->codec_id == CODEC_ID_MPEG1VIDEO;
 336
 337             put_bits(&s->pb, 1, constraint_parameter_flag);
 338
 339             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 340             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 341
 342             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 343                 put_header(s, EXT_START_CODE);
 344                 put_bits(&s->pb, 4, 1); //seq ext
 345
 346                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 347
 348                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 349                 put_bits(&s->pb, 4, s->avctx->level); //level
 350
 351                 put_bits(&s->pb, 1, s->progressive_sequence);
 352                 put_bits(&s->pb, 2, s->chroma_format);
 353                 put_bits(&s->pb, 2, 0); //horizontal size ext
 354                 put_bits(&s->pb, 2, 0); //vertical size ext
 355                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 356                 put_bits(&s->pb, 1, 1); //marker
 357                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 358                 put_bits(&s->pb, 1, s->low_delay);
 359                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
 360                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
 361             }
 362
 363             put_header(s, GOP_START_CODE);
 364             put_bits(&s->pb, 1, !!(s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE)); /* drop frame flag */
 365             /* time code : we must convert from the real frame rate to a
 366                fake mpeg frame rate in case of low frame rate */
 367             fps = (framerate.num + framerate.den/2)/ framerate.den;
 368             time_code = s->current_picture_ptr->coded_picture_number + s->avctx->timecode_frame_start;
 369
 370             s->gop_picture_number = s->current_picture_ptr->coded_picture_number;
 371             if (s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) {
 372                 /* only works for NTSC 29.97 */
 373                 int d = time_code / 17982;
 374                 int m = time_code % 17982;
 375                 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
 376                 time_code += 18 * d + 2 * ((m - 2) / 1798);
 377             }
 378             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 379             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 380             put_bits(&s->pb, 1, 1);
 381             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 382             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 383             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 384             put_bits(&s->pb, 1, 0); /* broken link */
 385         }
 386 }
 387
 388 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 389     while (run >= 33) {
 390         put_bits(&s->pb, 11, 0x008);
 391         run -= 33;
 392     }
 393     put_bits(&s->pb, mbAddrIncrTable[run][1],
 394              mbAddrIncrTable[run][0]);
 395 }
 396 #endif //CONFIG_ENCODERS
 397
 398 static void common_init(MpegEncContext *s)
 399 {
 400
 401     s->y_dc_scale_table=
 402     s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
 403
 404 }
 405
 406 void ff_mpeg1_clean_buffers(MpegEncContext *s){
 407     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
 408     s->last_dc[1] = s->last_dc[0];
 409     s->last_dc[2] = s->last_dc[0];
 410     memset(s->last_mv, 0, sizeof(s->last_mv));
 411 }
 412
 413 #ifdef CONFIG_ENCODERS
 414
 415 static av_always_inline void put_qscale(MpegEncContext *s)
 416 {
 417     if(s->q_scale_type){
 418         assert(s->qscale>=1 && s->qscale <=12);
 419         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 420     }else{
 421         put_bits(&s->pb, 5, s->qscale);
 422     }
 423 }
 424
 425 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 426     put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 427     put_qscale(s);
 428     put_bits(&s->pb, 1, 0); /* slice extra information */
 429 }
 430
 431 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 432 {
 433     mpeg1_encode_sequence_header(s);
 434
 435     /* mpeg1 picture header */
 436     put_header(s, PICTURE_START_CODE);
 437     /* temporal reference */
 438
 439     // RAL: s->picture_number instead of s->fake_picture_number
 440     put_bits(&s->pb, 10, (s->picture_number -
 441                           s->gop_picture_number) & 0x3ff);
 442     put_bits(&s->pb, 3, s->pict_type);
 443
 444     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 445     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 446
 447     // RAL: Forward f_code also needed for B frames
 448     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
 449         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 450         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 451             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 452         else
 453             put_bits(&s->pb, 3, 7); /* forward_f_code */
 454     }
 455
 456     // RAL: Backward f_code necessary for B frames
 457     if (s->pict_type == B_TYPE) {
 458         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 459         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 460             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 461         else
 462             put_bits(&s->pb, 3, 7); /* backward_f_code */
 463     }
 464
 465     put_bits(&s->pb, 1, 0); /* extra bit picture */
 466
 467     s->frame_pred_frame_dct = 1;
 468     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 469         put_header(s, EXT_START_CODE);
 470         put_bits(&s->pb, 4, 8); //pic ext
 471         if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
 472             put_bits(&s->pb, 4, s->f_code);
 473             put_bits(&s->pb, 4, s->f_code);
 474         }else{
 475             put_bits(&s->pb, 8, 255);
 476         }
 477         if (s->pict_type == B_TYPE) {
 478             put_bits(&s->pb, 4, s->b_code);
 479             put_bits(&s->pb, 4, s->b_code);
 480         }else{
 481             put_bits(&s->pb, 8, 255);
 482         }
 483         put_bits(&s->pb, 2, s->intra_dc_precision);
 484
 485         assert(s->picture_structure == PICT_FRAME);
 486         put_bits(&s->pb, 2, s->picture_structure);
 487         if (s->progressive_sequence) {
 488             put_bits(&s->pb, 1, 0); /* no repeat */
 489         } else {
 490             put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
 491         }
 492         /* XXX: optimize the generation of this flag with entropy
 493            measures */
 494         s->frame_pred_frame_dct = s->progressive_sequence;
 495
 496         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 497         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 498         put_bits(&s->pb, 1, s->q_scale_type);
 499         put_bits(&s->pb, 1, s->intra_vlc_format);
 500         put_bits(&s->pb, 1, s->alternate_scan);
 501         put_bits(&s->pb, 1, s->repeat_first_field);
 502         s->progressive_frame = s->progressive_sequence;
 503         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 504         put_bits(&s->pb, 1, s->progressive_frame);
 505         put_bits(&s->pb, 1, 0); //composite_display_flag
 506     }
 507     if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){
 508         int i;
 509
 510         put_header(s, USER_START_CODE);
 511         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 512             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 513         }
 514     }
 515
 516     s->mb_y=0;
 517     ff_mpeg1_encode_slice_header(s);
 518 }
 519
 520 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 521                                 int has_mv, int field_motion)
 522 {
 523     put_bits(&s->pb, n, bits);
 524     if (!s->frame_pred_frame_dct) {
 525         if (has_mv)
 526             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 527         put_bits(&s->pb, 1, s->interlaced_dct);
 528     }
 529 }
 530
 531 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 532                                                    DCTELEM block[6][64],
 533                                                    int motion_x, int motion_y,
 534                                                    int mb_block_count)
 535 {
 536     int i, cbp;
 537     const int mb_x = s->mb_x;
 538     const int mb_y = s->mb_y;
 539     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 540
 541     /* compute cbp */
 542     cbp = 0;
 543     for(i=0;i<mb_block_count;i++) {
 544         if (s->block_last_index[i] >= 0)
 545             cbp |= 1 << (mb_block_count - 1 - i);
 546     }
 547
 548     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 549         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
 550         ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
 551         (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) |
 552         ((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))) {
 553         s->mb_skip_run++;
 554         s->qscale -= s->dquant;
 555         s->skip_count++;
 556         s->misc_bits++;
 557         s->last_bits++;
 558         if(s->pict_type == P_TYPE){
 559             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 560             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 561         }
 562     } else {
 563         if(first_mb){
 564             assert(s->mb_skip_run == 0);
 565             encode_mb_skip_run(s, s->mb_x);
 566         }else{
 567             encode_mb_skip_run(s, s->mb_skip_run);
 568         }
 569
 570         if (s->pict_type == I_TYPE) {
 571             if(s->dquant && cbp){
 572                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 573                 put_qscale(s);
 574             }else{
 575                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 576                 s->qscale -= s->dquant;
 577             }
 578             s->misc_bits+= get_bits_diff(s);
 579             s->i_count++;
 580         } else if (s->mb_intra) {
 581             if(s->dquant && cbp){
 582                 put_mb_modes(s, 6, 0x01, 0, 0);
 583                 put_qscale(s);
 584             }else{
 585                 put_mb_modes(s, 5, 0x03, 0, 0);
 586                 s->qscale -= s->dquant;
 587             }
 588             s->misc_bits+= get_bits_diff(s);
 589             s->i_count++;
 590             memset(s->last_mv, 0, sizeof(s->last_mv));
 591         } else if (s->pict_type == P_TYPE) {
 592             if(s->mv_type == MV_TYPE_16X16){
 593                 if (cbp != 0) {
 594                     if ((motion_x|motion_y) == 0) {
 595                         if(s->dquant){
 596                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 597                             put_qscale(s);
 598                         }else{
 599                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 600                         }
 601                         s->misc_bits+= get_bits_diff(s);
 602                     } else {
 603                         if(s->dquant){
 604                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 605                             put_qscale(s);
 606                         }else{
 607                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 608                         }
 609                         s->misc_bits+= get_bits_diff(s);
 610                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 611                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 612                         s->mv_bits+= get_bits_diff(s);
 613                     }
 614                 } else {
 615                     put_bits(&s->pb, 3, 1); /* motion only */
 616                     if (!s->frame_pred_frame_dct)
 617                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 618                     s->misc_bits+= get_bits_diff(s);
 619                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 620                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 621                     s->qscale -= s->dquant;
 622                     s->mv_bits+= get_bits_diff(s);
 623                 }
 624                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 625                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 626             }else{
 627                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 628
 629                 if (cbp) {
 630                     if(s->dquant){
 631                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 632                         put_qscale(s);
 633                     }else{
 634                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 635                     }
 636                 } else {
 637                     put_bits(&s->pb, 3, 1); /* motion only */
 638                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 639                     s->qscale -= s->dquant;
 640                 }
 641                 s->misc_bits+= get_bits_diff(s);
 642                 for(i=0; i<2; i++){
 643                     put_bits(&s->pb, 1, s->field_select[0][i]);
 644                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 645                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 646                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 647                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 648                 }
 649                 s->mv_bits+= get_bits_diff(s);
 650             }
 651             if(cbp) {
 652                 if (s->chroma_y_shift) {
 653                     put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
 654                 } else {
 655                     put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
 656                     put_bits(&s->pb, 2, cbp & 3);
 657                 }
 658             }
 659             s->f_count++;
 660         } else{
 661             static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
 662
 663             if(s->mv_type == MV_TYPE_16X16){
 664                 if (cbp){    // With coded bloc pattern
 665                     if (s->dquant) {
 666                         if(s->mv_dir == MV_DIR_FORWARD)
 667                             put_mb_modes(s, 6, 3, 1, 0);
 668                         else
 669                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
 670                         put_qscale(s);
 671                     } else {
 672                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
 673                     }
 674                 }else{    // No coded bloc pattern
 675                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
 676                     if (!s->frame_pred_frame_dct)
 677                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 678                     s->qscale -= s->dquant;
 679                 }
 680                 s->misc_bits += get_bits_diff(s);
 681                 if (s->mv_dir&MV_DIR_FORWARD){
 682                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 683                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 684                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 685                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 686                     s->f_count++;
 687                 }
 688                 if (s->mv_dir&MV_DIR_BACKWARD){
 689                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 690                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 691                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 692                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 693                     s->b_count++;
 694                 }
 695             }else{
 696                 assert(s->mv_type == MV_TYPE_FIELD);
 697                 assert(!s->frame_pred_frame_dct);
 698                 if (cbp){    // With coded bloc pattern
 699                     if (s->dquant) {
 700                         if(s->mv_dir == MV_DIR_FORWARD)
 701                             put_mb_modes(s, 6, 3, 1, 1);
 702                         else
 703                             put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
 704                         put_qscale(s);
 705                     } else {
 706                         put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
 707                     }
 708                 }else{    // No coded bloc pattern
 709                     put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
 710                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 711                     s->qscale -= s->dquant;
 712                 }
 713                 s->misc_bits += get_bits_diff(s);
 714                 if (s->mv_dir&MV_DIR_FORWARD){
 715                     for(i=0; i<2; i++){
 716                         put_bits(&s->pb, 1, s->field_select[0][i]);
 717                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 718                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 719                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 720                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 721                     }
 722                     s->f_count++;
 723                 }
 724                 if (s->mv_dir&MV_DIR_BACKWARD){
 725                     for(i=0; i<2; i++){
 726                         put_bits(&s->pb, 1, s->field_select[1][i]);
 727                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 728                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 729                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 730                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 731                     }
 732                     s->b_count++;
 733                 }
 734             }
 735             s->mv_bits += get_bits_diff(s);
 736             if(cbp) {
 737                 if (s->chroma_y_shift) {
 738                     put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]);
 739                 } else {
 740                     put_bits(&s->pb, mbPatTable[cbp>>2][1], mbPatTable[cbp>>2][0]);
 741                     put_bits(&s->pb, 2, cbp & 3);
 742                 }
 743             }
 744         }
 745         for(i=0;i<mb_block_count;i++) {
 746             if (cbp & (1 << (mb_block_count - 1 - i))) {
 747                 mpeg1_encode_block(s, block[i], i);
 748             }
 749         }
 750         s->mb_skip_run = 0;
 751         if(s->mb_intra)
 752             s->i_tex_bits+= get_bits_diff(s);
 753         else
 754             s->p_tex_bits+= get_bits_diff(s);
 755     }
 756 }
 757
 758 void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
 759 {
 760     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 761     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 762 }
 763
 764 // RAL: Parameter added: f_or_b_code
 765 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 766 {
 767     int code, bit_size, l, bits, range, sign;
 768
 769     if (val == 0) {
 770         /* zero vector */
 771         code = 0;
 772         put_bits(&s->pb,
 773                  mbMotionVectorTable[0][1],
 774                  mbMotionVectorTable[0][0]);
 775     } else {
 776         bit_size = f_or_b_code - 1;
 777         range = 1 << bit_size;
 778         /* modulo encoding */
 779         l= INT_BIT - 5 - bit_size;
 780         val= (val<<l)>>l;
 781
 782         if (val >= 0) {
 783             val--;
 784             code = (val >> bit_size) + 1;
 785             bits = val & (range - 1);
 786             sign = 0;
 787         } else {
 788             val = -val;
 789             val--;
 790             code = (val >> bit_size) + 1;
 791             bits = val & (range - 1);
 792             sign = 1;
 793         }
 794
 795         assert(code > 0 && code <= 16);
 796
 797         put_bits(&s->pb,
 798                  mbMotionVectorTable[code][1],
 799                  mbMotionVectorTable[code][0]);
 800
 801         put_bits(&s->pb, 1, sign);
 802         if (bit_size > 0) {
 803             put_bits(&s->pb, bit_size, bits);
 804         }
 805     }
 806 }
 807
 808 void ff_mpeg1_encode_init(MpegEncContext *s)
 809 {
 810     static int done=0;
 811
 812     common_init(s);
 813
 814     if(!done){
 815         int f_code;
 816         int mv;
 817         int i;
 818
 819         done=1;
 820         init_rl(&rl_mpeg1, static_rl_table_store[0]);
 821         init_rl(&rl_mpeg2, static_rl_table_store[1]);
 822
 823         for(i=0; i<64; i++)
 824         {
 825                 mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
 826                 mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
 827         }
 828
 829         init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_len);
 830         if(s->intra_vlc_format)
 831             init_uni_ac_vlc(&rl_mpeg2, uni_mpeg2_ac_vlc_len);
 832
 833         /* build unified dc encoding tables */
 834         for(i=-255; i<256; i++)
 835         {
 836                 int adiff, index;
 837                 int bits, code;
 838                 int diff=i;
 839
 840                 adiff = FFABS(diff);
 841                 if(diff<0) diff--;
 842                 index = av_log2(2*adiff);
 843
 844                 bits= vlc_dc_lum_bits[index] + index;
 845                 code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 846                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 847
 848                 bits= vlc_dc_chroma_bits[index] + index;
 849                 code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 850                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 851         }
 852
 853         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 854             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 855                 int len;
 856
 857                 if(mv==0) len= mbMotionVectorTable[0][1];
 858                 else{
 859                     int val, bit_size, range, code;
 860
 861                     bit_size = f_code - 1;
 862                     range = 1 << bit_size;
 863
 864                     val=mv;
 865                     if (val < 0)
 866                         val = -val;
 867                     val--;
 868                     code = (val >> bit_size) + 1;
 869                     if(code<17){
 870                         len= mbMotionVectorTable[code][1] + 1 + bit_size;
 871                     }else{
 872                         len= mbMotionVectorTable[16][1] + 2 + bit_size;
 873                     }
 874                 }
 875
 876                 mv_penalty[f_code][mv+MAX_MV]= len;
 877             }
 878         }
 879
 880
 881         for(f_code=MAX_FCODE; f_code>0; f_code--){
 882             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 883                 fcode_tab[mv+MAX_MV]= f_code;
 884             }
 885         }
 886     }
 887     s->me.mv_penalty= mv_penalty;
 888     s->fcode_tab= fcode_tab;
 889     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 890         s->min_qcoeff=-255;
 891         s->max_qcoeff= 255;
 892     }else{
 893         s->min_qcoeff=-2047;
 894         s->max_qcoeff= 2047;
 895     }
 896     if (s->intra_vlc_format) {
 897         s->intra_ac_vlc_length=
 898         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 899     } else {
 900         s->intra_ac_vlc_length=
 901         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 902     }
 903     s->inter_ac_vlc_length=
 904     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 905 }
 906
 907 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 908 {
 909   if(((unsigned) (diff+255)) >= 511){
 910         int index;
 911
 912         if(diff<0){
 913             index= av_log2_16bit(-2*diff);
 914             diff--;
 915         }else{
 916             index= av_log2_16bit(2*diff);
 917         }
 918         if (component == 0) {
 919             put_bits(
 920                 &s->pb,
 921                 vlc_dc_lum_bits[index] + index,
 922                 (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 923         }else{
 924             put_bits(
 925                 &s->pb,
 926                 vlc_dc_chroma_bits[index] + index,
 927                 (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 928         }
 929   }else{
 930     if (component == 0) {
 931         put_bits(
 932             &s->pb,
 933             mpeg1_lum_dc_uni[diff+255]&0xFF,
 934             mpeg1_lum_dc_uni[diff+255]>>8);
 935     } else {
 936         put_bits(
 937             &s->pb,
 938             mpeg1_chr_dc_uni[diff+255]&0xFF,
 939             mpeg1_chr_dc_uni[diff+255]>>8);
 940     }
 941   }
 942 }
 943
 944 static void mpeg1_encode_block(MpegEncContext *s,
 945                                DCTELEM *block,
 946                                int n)
 947 {
 948     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 949     int code, component;
 950     const uint16_t (*table_vlc)[2] = rl_mpeg1.table_vlc;
 951
 952     last_index = s->block_last_index[n];
 953
 954     /* DC coef */
 955     if (s->mb_intra) {
 956         component = (n <= 3 ? 0 : (n&1) + 1);
 957         dc = block[0]; /* overflow is impossible */
 958         diff = dc - s->last_dc[component];
 959         encode_dc(s, diff, component);
 960         s->last_dc[component] = dc;
 961         i = 1;
 962         if (s->intra_vlc_format)
 963             table_vlc = rl_mpeg2.table_vlc;
 964     } else {
 965         /* encode the first coefficient : needs to be done here because
 966            it is handled slightly differently */
 967         level = block[0];
 968         if (abs(level) == 1) {
 969                 code = ((uint32_t)level >> 31); /* the sign bit */
 970                 put_bits(&s->pb, 2, code | 0x02);
 971                 i = 1;
 972         } else {
 973             i = 0;
 974             last_non_zero = -1;
 975             goto next_coef;
 976         }
 977     }
 978
 979     /* now quantify & encode AC coefs */
 980     last_non_zero = i - 1;
 981
 982     for(;i<=last_index;i++) {
 983         j = s->intra_scantable.permutated[i];
 984         level = block[j];
 985     next_coef:
 986 #if 0
 987         if (level != 0)
 988             dprintf(s->avctx, "level[%d]=%d\n", i, level);
 989 #endif
 990         /* encode using VLC */
 991         if (level != 0) {
 992             run = i - last_non_zero - 1;
 993
 994             alevel= level;
 995             MASK_ABS(sign, alevel)
 996             sign&=1;
 997
 998             if (alevel <= mpeg1_max_level[0][run]){
 999                 code= mpeg1_index_run[0][run] + alevel - 1;
1000                 /* store the vlc & sign at once */
1001                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
1002             } else {
1003                 /* escape seems to be pretty rare <5% so i dont optimize it */
1004                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
1005                 /* escape: only clip in this case */
1006                 put_bits(&s->pb, 6, run);
1007                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
1008                     if (alevel < 128) {
1009                         put_bits(&s->pb, 8, level & 0xff);
1010                     } else {
1011                         if (level < 0) {
1012                             put_bits(&s->pb, 16, 0x8001 + level + 255);
1013                         } else {
1014                             put_bits(&s->pb, 16, level & 0xffff);
1015                         }
1016                     }
1017                 }else{
1018                     put_bits(&s->pb, 12, level & 0xfff);
1019                 }
1020             }
1021             last_non_zero = i;
1022         }
1023     }
1024     /* end of block */
1025     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
1026 }
1027 #endif //CONFIG_ENCODERS
1028
1029 /******************************************/
1030 /* decoding */
1031
1032 static VLC dc_lum_vlc;
1033 static VLC dc_chroma_vlc;
1034 static VLC mv_vlc;
1035 static VLC mbincr_vlc;
1036 static VLC mb_ptype_vlc;
1037 static VLC mb_btype_vlc;
1038 static VLC mb_pat_vlc;
1039
1040 static void init_vlcs(void)
1041 {
1042     static int done = 0;
1043
1044     if (!done) {
1045         done = 1;
1046
1047         init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
1048                  vlc_dc_lum_bits, 1, 1,
1049                  vlc_dc_lum_code, 2, 2, 1);
1050         init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
1051                  vlc_dc_chroma_bits, 1, 1,
1052                  vlc_dc_chroma_code, 2, 2, 1);
1053         init_vlc(&mv_vlc, MV_VLC_BITS, 17,
1054                  &mbMotionVectorTable[0][1], 2, 1,
1055                  &mbMotionVectorTable[0][0], 2, 1, 1);
1056         init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
1057                  &mbAddrIncrTable[0][1], 2, 1,
1058                  &mbAddrIncrTable[0][0], 2, 1, 1);
1059         init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
1060                  &mbPatTable[0][1], 2, 1,
1061                  &mbPatTable[0][0], 2, 1, 1);
1062
1063         init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
1064                  &table_mb_ptype[0][1], 2, 1,
1065                  &table_mb_ptype[0][0], 2, 1, 1);
1066         init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
1067                  &table_mb_btype[0][1], 2, 1,
1068                  &table_mb_btype[0][0], 2, 1, 1);
1069         init_rl(&rl_mpeg1, static_rl_table_store[0]);
1070         init_rl(&rl_mpeg2, static_rl_table_store[1]);
1071
1072         init_2d_vlc_rl(&rl_mpeg1, 1);
1073         init_2d_vlc_rl(&rl_mpeg2, 1);
1074     }
1075 }
1076
1077 static inline int get_dmv(MpegEncContext *s)
1078 {
1079     if(get_bits1(&s->gb))
1080         return 1 - (get_bits1(&s->gb) << 1);
1081     else
1082         return 0;
1083 }
1084
1085 static inline int get_qscale(MpegEncContext *s)
1086 {
1087     int qscale = get_bits(&s->gb, 5);
1088     if (s->q_scale_type) {
1089         return non_linear_qscale[qscale];
1090     } else {
1091         return qscale << 1;
1092     }
1093 }
1094
1095 /* motion type (for mpeg2) */
1096 #define MT_FIELD 1
1097 #define MT_FRAME 2
1098 #define MT_16X8  2
1099 #define MT_DMV   3
1100
1101 static int mpeg_decode_mb(MpegEncContext *s,
1102                           DCTELEM block[12][64])
1103 {
1104     int i, j, k, cbp, val, mb_type, motion_type;
1105     const int mb_block_count = 4 + (1<< s->chroma_format);
1106
1107     dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1108
1109     assert(s->mb_skipped==0);
1110
1111     if (s->mb_skip_run-- != 0) {
1112         if(s->pict_type == I_TYPE){
1113             av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1114             return -1;
1115         }
1116
1117         /* skip mb */
1118         s->mb_intra = 0;
1119         for(i=0;i<12;i++)
1120             s->block_last_index[i] = -1;
1121         if(s->picture_structure == PICT_FRAME)
1122             s->mv_type = MV_TYPE_16X16;
1123         else
1124             s->mv_type = MV_TYPE_FIELD;
1125         if (s->pict_type == P_TYPE) {
1126             /* if P type, zero motion vector is implied */
1127             s->mv_dir = MV_DIR_FORWARD;
1128             s->mv[0][0][0] = s->mv[0][0][1] = 0;
1129             s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1130             s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1131             s->field_select[0][0]= s->picture_structure - 1;
1132             s->mb_skipped = 1;
1133             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1134         } else {
1135             int mb_type;
1136
1137             if(s->mb_x)
1138                 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
1139             else
1140                 mb_type= s->current_picture.mb_type[ s->mb_width + (s->mb_y-1)*s->mb_stride - 1]; // FIXME not sure if this is allowed in mpeg at all,
1141             if(IS_INTRA(mb_type))
1142                 return -1;
1143
1144             /* if B type, reuse previous vectors and directions */
1145             s->mv[0][0][0] = s->last_mv[0][0][0];
1146             s->mv[0][0][1] = s->last_mv[0][0][1];
1147             s->mv[1][0][0] = s->last_mv[1][0][0];
1148             s->mv[1][0][1] = s->last_mv[1][0][1];
1149
1150             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
1151                 mb_type | MB_TYPE_SKIP;
1152 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1153
1154             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
1155                 s->mb_skipped = 1;
1156         }
1157
1158         return 0;
1159     }
1160
1161     switch(s->pict_type) {
1162     default:
1163     case I_TYPE:
1164         if (get_bits1(&s->gb) == 0) {
1165             if (get_bits1(&s->gb) == 0){
1166                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1167                 return -1;
1168             }
1169             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1170         } else {
1171             mb_type = MB_TYPE_INTRA;
1172         }
1173         break;
1174     case P_TYPE:
1175         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1176         if (mb_type < 0){
1177             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1178             return -1;
1179         }
1180         mb_type = ptype2mb_type[ mb_type ];
1181         break;
1182     case B_TYPE:
1183         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1184         if (mb_type < 0){
1185             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1186             return -1;
1187         }
1188         mb_type = btype2mb_type[ mb_type ];
1189         break;
1190     }
1191     dprintf(s->avctx, "mb_type=%x\n", mb_type);
1192 //    motion_type = 0; /* avoid warning */
1193     if (IS_INTRA(mb_type)) {
1194         s->dsp.clear_blocks(s->block[0]);
1195
1196         if(!s->chroma_y_shift){
1197             s->dsp.clear_blocks(s->block[6]);
1198         }
1199
1200         /* compute dct type */
1201         if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1202             !s->frame_pred_frame_dct) {
1203             s->interlaced_dct = get_bits1(&s->gb);
1204         }
1205
1206         if (IS_QUANT(mb_type))
1207             s->qscale = get_qscale(s);
1208
1209         if (s->concealment_motion_vectors) {
1210             /* just parse them */
1211             if (s->picture_structure != PICT_FRAME)
1212                 skip_bits1(&s->gb); /* field select */
1213
1214             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
1215                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1216             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
1217                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1218
1219             skip_bits1(&s->gb); /* marker */
1220         }else
1221             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1222         s->mb_intra = 1;
1223 #ifdef HAVE_XVMC
1224         //one 1 we memcpy blocks in xvmcvideo
1225         if(s->avctx->xvmc_acceleration > 1){
1226             XVMC_pack_pblocks(s,-1);//inter are always full blocks
1227             if(s->swap_uv){
1228                 exchange_uv(s);
1229             }
1230         }
1231 #endif
1232
1233         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1234             if(s->flags2 & CODEC_FLAG2_FAST){
1235                 for(i=0;i<6;i++) {
1236                     mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
1237                 }
1238             }else{
1239                 for(i=0;i<mb_block_count;i++) {
1240                     if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1241                         return -1;
1242                 }
1243             }
1244         } else {
1245             for(i=0;i<6;i++) {
1246                 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1247                     return -1;
1248             }
1249         }
1250     } else {
1251         if (mb_type & MB_TYPE_ZERO_MV){
1252             assert(mb_type & MB_TYPE_CBP);
1253
1254             /* compute dct type */
1255             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1256                 !s->frame_pred_frame_dct) {
1257                 s->interlaced_dct = get_bits1(&s->gb);
1258             }
1259
1260             if (IS_QUANT(mb_type))
1261                 s->qscale = get_qscale(s);
1262
1263             s->mv_dir = MV_DIR_FORWARD;
1264             if(s->picture_structure == PICT_FRAME)
1265                 s->mv_type = MV_TYPE_16X16;
1266             else{
1267                 s->mv_type = MV_TYPE_FIELD;
1268                 mb_type |= MB_TYPE_INTERLACED;
1269                 s->field_select[0][0]= s->picture_structure - 1;
1270             }
1271             s->last_mv[0][0][0] = 0;
1272             s->last_mv[0][0][1] = 0;
1273             s->last_mv[0][1][0] = 0;
1274             s->last_mv[0][1][1] = 0;
1275             s->mv[0][0][0] = 0;
1276             s->mv[0][0][1] = 0;
1277         }else{
1278             assert(mb_type & MB_TYPE_L0L1);
1279 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1280             /* get additional motion vector type */
1281             if (s->frame_pred_frame_dct)
1282                 motion_type = MT_FRAME;
1283             else{
1284                 motion_type = get_bits(&s->gb, 2);
1285             }
1286
1287             /* compute dct type */
1288             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1289                 !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1290                 s->interlaced_dct = get_bits1(&s->gb);
1291             }
1292
1293             if (IS_QUANT(mb_type))
1294                 s->qscale = get_qscale(s);
1295
1296             /* motion vectors */
1297             s->mv_dir = 0;
1298             for(i=0;i<2;i++) {
1299                 if (USES_LIST(mb_type, i)) {
1300                     s->mv_dir |= (MV_DIR_FORWARD >> i);
1301                     dprintf(s->avctx, "motion_type=%d\n", motion_type);
1302                     switch(motion_type) {
1303                     case MT_FRAME: /* or MT_16X8 */
1304                         if (s->picture_structure == PICT_FRAME) {
1305                             /* MT_FRAME */
1306                             mb_type |= MB_TYPE_16x16;
1307                             s->mv_type = MV_TYPE_16X16;
1308                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
1309                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1310                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
1311                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1312                             /* full_pel: only for mpeg1 */
1313                             if (s->full_pel[i]){
1314                                 s->mv[i][0][0] <<= 1;
1315                                 s->mv[i][0][1] <<= 1;
1316                             }
1317                         } else {
1318                             /* MT_16X8 */
1319                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1320                             s->mv_type = MV_TYPE_16X8;
1321                             for(j=0;j<2;j++) {
1322                                 s->field_select[i][j] = get_bits1(&s->gb);
1323                                 for(k=0;k<2;k++) {
1324                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1325                                                              s->last_mv[i][j][k]);
1326                                     s->last_mv[i][j][k] = val;
1327                                     s->mv[i][j][k] = val;
1328                                 }
1329                             }
1330                         }
1331                         break;
1332                     case MT_FIELD:
1333                         s->mv_type = MV_TYPE_FIELD;
1334                         if (s->picture_structure == PICT_FRAME) {
1335                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1336                             for(j=0;j<2;j++) {
1337                                 s->field_select[i][j] = get_bits1(&s->gb);
1338                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1339                                                          s->last_mv[i][j][0]);
1340                                 s->last_mv[i][j][0] = val;
1341                                 s->mv[i][j][0] = val;
1342                                 dprintf(s->avctx, "fmx=%d\n", val);
1343                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1344                                                          s->last_mv[i][j][1] >> 1);
1345                                 s->last_mv[i][j][1] = val << 1;
1346                                 s->mv[i][j][1] = val;
1347                                 dprintf(s->avctx, "fmy=%d\n", val);
1348                             }
1349                         } else {
1350                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1351                             s->field_select[i][0] = get_bits1(&s->gb);
1352                             for(k=0;k<2;k++) {
1353                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1354                                                          s->last_mv[i][0][k]);
1355                                 s->last_mv[i][0][k] = val;
1356                                 s->last_mv[i][1][k] = val;
1357                                 s->mv[i][0][k] = val;
1358                             }
1359                         }
1360                         break;
1361                     case MT_DMV:
1362                         {
1363                             int dmx, dmy, mx, my, m;
1364
1365                             mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1366                                                     s->last_mv[i][0][0]);
1367                             s->last_mv[i][0][0] = mx;
1368                             s->last_mv[i][1][0] = mx;
1369                             dmx = get_dmv(s);
1370                             my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1371                                                     s->last_mv[i][0][1] >> 1);
1372                             dmy = get_dmv(s);
1373                             s->mv_type = MV_TYPE_DMV;
1374
1375
1376                             s->last_mv[i][0][1] = my<<1;
1377                             s->last_mv[i][1][1] = my<<1;
1378
1379                             s->mv[i][0][0] = mx;
1380                             s->mv[i][0][1] = my;
1381                             s->mv[i][1][0] = mx;//not used
1382                             s->mv[i][1][1] = my;//not used
1383
1384                             if (s->picture_structure == PICT_FRAME) {
1385                                 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1386
1387                                 //m = 1 + 2 * s->top_field_first;
1388                                 m = s->top_field_first ? 1 : 3;
1389
1390                                 /* top -> top pred */
1391                                 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1392                                 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1393                                 m = 4 - m;
1394                                 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1395                                 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1396                             } else {
1397                                 mb_type |= MB_TYPE_16x16;
1398
1399                                 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1400                                 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1401                                 if(s->picture_structure == PICT_TOP_FIELD)
1402                                     s->mv[i][2][1]--;
1403                                 else
1404                                     s->mv[i][2][1]++;
1405                             }
1406                         }
1407                         break;
1408                     default:
1409                         av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1410                         return -1;
1411                     }
1412                 }
1413             }
1414         }
1415
1416         s->mb_intra = 0;
1417         if (HAS_CBP(mb_type)) {
1418             s->dsp.clear_blocks(s->block[0]);
1419
1420             if(!s->chroma_y_shift){
1421                 s->dsp.clear_blocks(s->block[6]);
1422             }
1423
1424             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1425             if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
1426                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1427                 return -1;
1428             }
1429             if(mb_block_count > 6){
1430                  cbp<<= mb_block_count-6;
1431                  cbp |= get_bits(&s->gb, mb_block_count-6);
1432             }
1433
1434 #ifdef HAVE_XVMC
1435             //on 1 we memcpy blocks in xvmcvideo
1436             if(s->avctx->xvmc_acceleration > 1){
1437                 XVMC_pack_pblocks(s,cbp);
1438                 if(s->swap_uv){
1439                     exchange_uv(s);
1440                 }
1441             }
1442 #endif
1443
1444             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1445                 if(s->flags2 & CODEC_FLAG2_FAST){
1446                     for(i=0;i<6;i++) {
1447                         if(cbp & 32) {
1448                             mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
1449                         } else {
1450                             s->block_last_index[i] = -1;
1451                         }
1452                         cbp+=cbp;
1453                     }
1454                 }else{
1455                     cbp<<= 12-mb_block_count;
1456
1457                     for(i=0;i<mb_block_count;i++) {
1458                         if ( cbp & (1<<11) ) {
1459                             if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1460                                 return -1;
1461                         } else {
1462                             s->block_last_index[i] = -1;
1463                         }
1464                         cbp+=cbp;
1465                     }
1466                 }
1467             } else {
1468                 if(s->flags2 & CODEC_FLAG2_FAST){
1469                     for(i=0;i<6;i++) {
1470                         if (cbp & 32) {
1471                             mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
1472                         } else {
1473                             s->block_last_index[i] = -1;
1474                         }
1475                         cbp+=cbp;
1476                     }
1477                 }else{
1478                     for(i=0;i<6;i++) {
1479                         if (cbp & 32) {
1480                             if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1481                                 return -1;
1482                         } else {
1483                             s->block_last_index[i] = -1;
1484                         }
1485                         cbp+=cbp;
1486                     }
1487                 }
1488             }
1489         }else{
1490             for(i=0;i<12;i++)
1491                 s->block_last_index[i] = -1;
1492         }
1493     }
1494
1495     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1496
1497     return 0;
1498 }
1499
1500 /* as h263, but only 17 codes */
1501 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1502 {
1503     int code, sign, val, l, shift;
1504
1505     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1506     if (code == 0) {
1507         return pred;
1508     }
1509     if (code < 0) {
1510         return 0xffff;
1511     }
1512
1513     sign = get_bits1(&s->gb);
1514     shift = fcode - 1;
1515     val = code;
1516     if (shift) {
1517         val = (val - 1) << shift;
1518         val |= get_bits(&s->gb, shift);
1519         val++;
1520     }
1521     if (sign)
1522         val = -val;
1523     val += pred;
1524
1525     /* modulo decoding */
1526     l= INT_BIT - 5 - shift;
1527     val = (val<<l)>>l;
1528     return val;
1529 }
1530
1531 static inline int decode_dc(GetBitContext *gb, int component)
1532 {
1533     int code, diff;
1534
1535     if (component == 0) {
1536         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1537     } else {
1538         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1539     }
1540     if (code < 0){
1541         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1542         return 0xffff;
1543     }
1544     if (code == 0) {
1545         diff = 0;
1546     } else {
1547         diff = get_xbits(gb, code);
1548     }
1549     return diff;
1550 }
1551
1552 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
1553                                DCTELEM *block,
1554                                int n)
1555 {
1556     int level, dc, diff, i, j, run;
1557     int component;
1558     RLTable *rl = &rl_mpeg1;
1559     uint8_t * const scantable= s->intra_scantable.permutated;
1560     const uint16_t *quant_matrix= s->intra_matrix;
1561     const int qscale= s->qscale;
1562
1563     /* DC coef */
1564     component = (n <= 3 ? 0 : n - 4 + 1);
1565     diff = decode_dc(&s->gb, component);
1566     if (diff >= 0xffff)
1567         return -1;
1568     dc = s->last_dc[component];
1569     dc += diff;
1570     s->last_dc[component] = dc;
1571     block[0] = dc<<3;
1572     dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
1573     i = 0;
1574     {
1575         OPEN_READER(re, &s->gb);
1576         /* now quantify & encode AC coefs */
1577         for(;;) {
1578             UPDATE_CACHE(re, &s->gb);
1579             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1580
1581             if(level == 127){
1582                 break;
1583             } else if(level != 0) {
1584                 i += run;
1585                 j = scantable[i];
1586                 level= (level*qscale*quant_matrix[j])>>4;
1587                 level= (level-1)|1;
1588                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1589                 LAST_SKIP_BITS(re, &s->gb, 1);
1590             } else {
1591                 /* escape */
1592                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1593                 UPDATE_CACHE(re, &s->gb);
1594                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1595                 if (level == -128) {
1596                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1597                 } else if (level == 0) {
1598                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1599                 }
1600                 i += run;
1601                 j = scantable[i];
1602                 if(level<0){
1603                     level= -level;
1604                     level= (level*qscale*quant_matrix[j])>>4;
1605                     level= (level-1)|1;
1606                     level= -level;
1607                 }else{
1608                     level= (level*qscale*quant_matrix[j])>>4;
1609                     level= (level-1)|1;
1610                 }
1611             }
1612             if (i > 63){
1613                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1614                 return -1;
1615             }
1616
1617             block[j] = level;
1618         }
1619         CLOSE_READER(re, &s->gb);
1620     }
1621     s->block_last_index[n] = i;
1622    return 0;
1623 }
1624
1625 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
1626                                DCTELEM *block,
1627                                int n)
1628 {
1629     int level, i, j, run;
1630     RLTable *rl = &rl_mpeg1;
1631     uint8_t * const scantable= s->intra_scantable.permutated;
1632     const uint16_t *quant_matrix= s->inter_matrix;
1633     const int qscale= s->qscale;
1634
1635     {
1636         OPEN_READER(re, &s->gb);
1637         i = -1;
1638         /* special case for the first coef. no need to add a second vlc table */
1639         UPDATE_CACHE(re, &s->gb);
1640         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1641             level= (3*qscale*quant_matrix[0])>>5;
1642             level= (level-1)|1;
1643             if(GET_CACHE(re, &s->gb)&0x40000000)
1644                 level= -level;
1645             block[0] = level;
1646             i++;
1647             SKIP_BITS(re, &s->gb, 2);
1648             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1649                 goto end;
1650         }
1651
1652         /* now quantify & encode AC coefs */
1653         for(;;) {
1654             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1655
1656             if(level != 0) {
1657                 i += run;
1658                 j = scantable[i];
1659                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1660                 level= (level-1)|1;
1661                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1662                 SKIP_BITS(re, &s->gb, 1);
1663             } else {
1664                 /* escape */
1665                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1666                 UPDATE_CACHE(re, &s->gb);
1667                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1668                 if (level == -128) {
1669                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1670                 } else if (level == 0) {
1671                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1672                 }
1673                 i += run;
1674                 j = scantable[i];
1675                 if(level<0){
1676                     level= -level;
1677                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1678                     level= (level-1)|1;
1679                     level= -level;
1680                 }else{
1681                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1682                     level= (level-1)|1;
1683                 }
1684             }
1685             if (i > 63){
1686                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1687                 return -1;
1688             }
1689
1690             block[j] = level;
1691             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1692                 break;
1693             UPDATE_CACHE(re, &s->gb);
1694         }
1695 end:
1696         LAST_SKIP_BITS(re, &s->gb, 2);
1697         CLOSE_READER(re, &s->gb);
1698     }
1699     s->block_last_index[n] = i;
1700     return 0;
1701 }
1702
1703 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
1704 {
1705     int level, i, j, run;
1706     RLTable *rl = &rl_mpeg1;
1707     uint8_t * const scantable= s->intra_scantable.permutated;
1708     const int qscale= s->qscale;
1709
1710     {
1711         OPEN_READER(re, &s->gb);
1712         i = -1;
1713         /* special case for the first coef. no need to add a second vlc table */
1714         UPDATE_CACHE(re, &s->gb);
1715         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1716             level= (3*qscale)>>1;
1717             level= (level-1)|1;
1718             if(GET_CACHE(re, &s->gb)&0x40000000)
1719                 level= -level;
1720             block[0] = level;
1721             i++;
1722             SKIP_BITS(re, &s->gb, 2);
1723             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1724                 goto end;
1725         }
1726
1727         /* now quantify & encode AC coefs */
1728         for(;;) {
1729             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1730
1731             if(level != 0) {
1732                 i += run;
1733                 j = scantable[i];
1734                 level= ((level*2+1)*qscale)>>1;
1735                 level= (level-1)|1;
1736                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1737                 SKIP_BITS(re, &s->gb, 1);
1738             } else {
1739                 /* escape */
1740                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1741                 UPDATE_CACHE(re, &s->gb);
1742                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1743                 if (level == -128) {
1744                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
1745                 } else if (level == 0) {
1746                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
1747                 }
1748                 i += run;
1749                 j = scantable[i];
1750                 if(level<0){
1751                     level= -level;
1752                     level= ((level*2+1)*qscale)>>1;
1753                     level= (level-1)|1;
1754                     level= -level;
1755                 }else{
1756                     level= ((level*2+1)*qscale)>>1;
1757                     level= (level-1)|1;
1758                 }
1759             }
1760
1761             block[j] = level;
1762             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1763                 break;
1764             UPDATE_CACHE(re, &s->gb);
1765         }
1766 end:
1767         LAST_SKIP_BITS(re, &s->gb, 2);
1768         CLOSE_READER(re, &s->gb);
1769     }
1770     s->block_last_index[n] = i;
1771     return 0;
1772 }
1773
1774
1775 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
1776                                DCTELEM *block,
1777                                int n)
1778 {
1779     int level, i, j, run;
1780     RLTable *rl = &rl_mpeg1;
1781     uint8_t * const scantable= s->intra_scantable.permutated;
1782     const uint16_t *quant_matrix;
1783     const int qscale= s->qscale;
1784     int mismatch;
1785
1786     mismatch = 1;
1787
1788     {
1789         OPEN_READER(re, &s->gb);
1790         i = -1;
1791         if (n < 4)
1792             quant_matrix = s->inter_matrix;
1793         else
1794             quant_matrix = s->chroma_inter_matrix;
1795
1796         /* special case for the first coef. no need to add a second vlc table */
1797         UPDATE_CACHE(re, &s->gb);
1798         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1799             level= (3*qscale*quant_matrix[0])>>5;
1800             if(GET_CACHE(re, &s->gb)&0x40000000)
1801                 level= -level;
1802             block[0] = level;
1803             mismatch ^= level;
1804             i++;
1805             SKIP_BITS(re, &s->gb, 2);
1806             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1807                 goto end;
1808         }
1809
1810         /* now quantify & encode AC coefs */
1811         for(;;) {
1812             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1813
1814             if(level != 0) {
1815                 i += run;
1816                 j = scantable[i];
1817                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1818                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1819                 SKIP_BITS(re, &s->gb, 1);
1820             } else {
1821                 /* escape */
1822                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1823                 UPDATE_CACHE(re, &s->gb);
1824                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1825
1826                 i += run;
1827                 j = scantable[i];
1828                 if(level<0){
1829                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1830                     level= -level;
1831                 }else{
1832                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1833                 }
1834             }
1835             if (i > 63){
1836                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1837                 return -1;
1838             }
1839
1840             mismatch ^= level;
1841             block[j] = level;
1842             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1843                 break;
1844             UPDATE_CACHE(re, &s->gb);
1845         }
1846 end:
1847         LAST_SKIP_BITS(re, &s->gb, 2);
1848         CLOSE_READER(re, &s->gb);
1849     }
1850     block[63] ^= (mismatch & 1);
1851
1852     s->block_last_index[n] = i;
1853     return 0;
1854 }
1855
1856 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
1857                                DCTELEM *block,
1858                                int n)
1859 {
1860     int level, i, j, run;
1861     RLTable *rl = &rl_mpeg1;
1862     uint8_t * const scantable= s->intra_scantable.permutated;
1863     const int qscale= s->qscale;
1864     OPEN_READER(re, &s->gb);
1865     i = -1;
1866
1867     /* special case for the first coef. no need to add a second vlc table */
1868     UPDATE_CACHE(re, &s->gb);
1869     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
1870         level= (3*qscale)>>1;
1871         if(GET_CACHE(re, &s->gb)&0x40000000)
1872             level= -level;
1873         block[0] = level;
1874         i++;
1875         SKIP_BITS(re, &s->gb, 2);
1876         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1877             goto end;
1878     }
1879
1880     /* now quantify & encode AC coefs */
1881     for(;;) {
1882         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1883
1884         if(level != 0) {
1885             i += run;
1886             j = scantable[i];
1887             level= ((level*2+1)*qscale)>>1;
1888             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1889             SKIP_BITS(re, &s->gb, 1);
1890         } else {
1891             /* escape */
1892             run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1893             UPDATE_CACHE(re, &s->gb);
1894             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1895
1896             i += run;
1897             j = scantable[i];
1898             if(level<0){
1899                 level= ((-level*2+1)*qscale)>>1;
1900                 level= -level;
1901             }else{
1902                 level= ((level*2+1)*qscale)>>1;
1903             }
1904         }
1905
1906         block[j] = level;
1907         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1908             break;
1909         UPDATE_CACHE(re, &s->gb);
1910     }
1911 end:
1912     LAST_SKIP_BITS(re, &s->gb, 2);
1913     CLOSE_READER(re, &s->gb);
1914     s->block_last_index[n] = i;
1915     return 0;
1916 }
1917
1918
1919 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1920                                DCTELEM *block,
1921                                int n)
1922 {
1923     int level, dc, diff, i, j, run;
1924     int component;
1925     RLTable *rl;
1926     uint8_t * const scantable= s->intra_scantable.permutated;
1927     const uint16_t *quant_matrix;
1928     const int qscale= s->qscale;
1929     int mismatch;
1930
1931     /* DC coef */
1932     if (n < 4){
1933         quant_matrix = s->intra_matrix;
1934         component = 0;
1935     }else{
1936         quant_matrix = s->chroma_intra_matrix;
1937         component = (n&1) + 1;
1938     }
1939     diff = decode_dc(&s->gb, component);
1940     if (diff >= 0xffff)
1941         return -1;
1942     dc = s->last_dc[component];
1943     dc += diff;
1944     s->last_dc[component] = dc;
1945     block[0] = dc << (3 - s->intra_dc_precision);
1946     dprintf(s->avctx, "dc=%d\n", block[0]);
1947     mismatch = block[0] ^ 1;
1948     i = 0;
1949     if (s->intra_vlc_format)
1950         rl = &rl_mpeg2;
1951     else
1952         rl = &rl_mpeg1;
1953
1954     {
1955         OPEN_READER(re, &s->gb);
1956         /* now quantify & encode AC coefs */
1957         for(;;) {
1958             UPDATE_CACHE(re, &s->gb);
1959             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1960
1961             if(level == 127){
1962                 break;
1963             } else if(level != 0) {
1964                 i += run;
1965                 j = scantable[i];
1966                 level= (level*qscale*quant_matrix[j])>>4;
1967                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1968                 LAST_SKIP_BITS(re, &s->gb, 1);
1969             } else {
1970                 /* escape */
1971                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1972                 UPDATE_CACHE(re, &s->gb);
1973                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1974                 i += run;
1975                 j = scantable[i];
1976                 if(level<0){
1977                     level= (-level*qscale*quant_matrix[j])>>4;
1978                     level= -level;
1979                 }else{
1980                     level= (level*qscale*quant_matrix[j])>>4;
1981                 }
1982             }
1983             if (i > 63){
1984                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1985                 return -1;
1986             }
1987
1988             mismatch^= level;
1989             block[j] = level;
1990         }
1991         CLOSE_READER(re, &s->gb);
1992     }
1993     block[63]^= mismatch&1;
1994
1995     s->block_last_index[n] = i;
1996     return 0;
1997 }
1998
1999 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
2000                                DCTELEM *block,
2001                                int n)
2002 {
2003     int level, dc, diff, j, run;
2004     int component;
2005     RLTable *rl;
2006     uint8_t * scantable= s->intra_scantable.permutated;
2007     const uint16_t *quant_matrix;
2008     const int qscale= s->qscale;
2009
2010     /* DC coef */
2011     if (n < 4){
2012         quant_matrix = s->intra_matrix;
2013         component = 0;
2014     }else{
2015         quant_matrix = s->chroma_intra_matrix;
2016         component = (n&1) + 1;
2017     }
2018     diff = decode_dc(&s->gb, component);
2019     if (diff >= 0xffff)
2020         return -1;
2021     dc = s->last_dc[component];
2022     dc += diff;
2023     s->last_dc[component] = dc;
2024     block[0] = dc << (3 - s->intra_dc_precision);
2025     if (s->intra_vlc_format)
2026         rl = &rl_mpeg2;
2027     else
2028         rl = &rl_mpeg1;
2029
2030     {
2031         OPEN_READER(re, &s->gb);
2032         /* now quantify & encode AC coefs */
2033         for(;;) {
2034             UPDATE_CACHE(re, &s->gb);
2035             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
2036
2037             if(level == 127){
2038                 break;
2039             } else if(level != 0) {
2040                 scantable += run;
2041                 j = *scantable;
2042                 level= (level*qscale*quant_matrix[j])>>4;
2043                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
2044                 LAST_SKIP_BITS(re, &s->gb, 1);
2045             } else {
2046                 /* escape */
2047                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
2048                 UPDATE_CACHE(re, &s->gb);
2049                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
2050                 scantable += run;
2051                 j = *scantable;
2052                 if(level<0){
2053                     level= (-level*qscale*quant_matrix[j])>>4;
2054                     level= -level;
2055                 }else{
2056                     level= (level*qscale*quant_matrix[j])>>4;
2057                 }
2058             }
2059
2060             block[j] = level;
2061         }
2062         CLOSE_READER(re, &s->gb);
2063     }
2064
2065     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
2066     return 0;
2067 }
2068
2069 typedef struct Mpeg1Context {
2070     MpegEncContext mpeg_enc_ctx;
2071     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
2072     int repeat_field; /* true if we must repeat the field */
2073     AVPanScan pan_scan; /** some temporary storage for the panscan */
2074     int slice_count;
2075     int swap_uv;//indicate VCR2
2076     int save_aspect_info;
2077     int save_width, save_height;
2078     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
2079
2080 } Mpeg1Context;
2081
2082 static int mpeg_decode_init(AVCodecContext *avctx)
2083 {
2084     Mpeg1Context *s = avctx->priv_data;
2085     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2086     int i;
2087
2088     //we need some parmutation to store
2089     //matrixes, until MPV_common_init()
2090     //set the real permutatuon
2091     for(i=0;i<64;i++)
2092        s2->dsp.idct_permutation[i]=i;
2093
2094     MPV_decode_defaults(s2);
2095
2096     s->mpeg_enc_ctx.avctx= avctx;
2097     s->mpeg_enc_ctx.flags= avctx->flags;
2098     s->mpeg_enc_ctx.flags2= avctx->flags2;
2099     common_init(&s->mpeg_enc_ctx);
2100     init_vlcs();
2101
2102     s->mpeg_enc_ctx_allocated = 0;
2103     s->mpeg_enc_ctx.picture_number = 0;
2104     s->repeat_field = 0;
2105     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
2106     return 0;
2107 }
2108
2109 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
2110                                      const uint8_t *new_perm){
2111     uint16_t temp_matrix[64];
2112     int i;
2113
2114     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
2115
2116     for(i=0;i<64;i++){
2117         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
2118     }
2119 }
2120
2121 //Call this function when we know all parameters
2122 //it may be called in different places for mpeg1 and mpeg2
2123 static int mpeg_decode_postinit(AVCodecContext *avctx){
2124     Mpeg1Context *s1 = avctx->priv_data;
2125     MpegEncContext *s = &s1->mpeg_enc_ctx;
2126     uint8_t old_permutation[64];
2127
2128     if (
2129         (s1->mpeg_enc_ctx_allocated == 0)||
2130         avctx->coded_width  != s->width ||
2131         avctx->coded_height != s->height||
2132         s1->save_width != s->width ||
2133         s1->save_height != s->height ||
2134         s1->save_aspect_info != s->aspect_ratio_info||
2135         0)
2136     {
2137
2138         if (s1->mpeg_enc_ctx_allocated) {
2139             ParseContext pc= s->parse_context;
2140             s->parse_context.buffer=0;
2141             MPV_common_end(s);
2142             s->parse_context= pc;
2143         }
2144
2145         if( (s->width == 0 )||(s->height == 0))
2146             return -2;
2147
2148         avcodec_set_dimensions(avctx, s->width, s->height);
2149         avctx->bit_rate = s->bit_rate;
2150         s1->save_aspect_info = s->aspect_ratio_info;
2151         s1->save_width = s->width;
2152         s1->save_height = s->height;
2153
2154      //low_delay may be forced, in this case we will have B frames
2155      //that behave like P frames
2156         avctx->has_b_frames = !(s->low_delay);
2157
2158         if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
2159             //mpeg1 fps
2160             avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
2161             avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
2162             //mpeg1 aspect
2163             avctx->sample_aspect_ratio= av_d2q(
2164                     1.0/mpeg1_aspect[s->aspect_ratio_info], 255);
2165
2166         }else{//mpeg2
2167         //mpeg2 fps
2168             av_reduce(
2169                 &s->avctx->time_base.den,
2170                 &s->avctx->time_base.num,
2171                 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
2172                 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
2173                 1<<30);
2174         //mpeg2 aspect
2175             if(s->aspect_ratio_info > 1){
2176                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
2177                     s->avctx->sample_aspect_ratio=
2178                         av_div_q(
2179                          mpeg2_aspect[s->aspect_ratio_info],
2180                          (AVRational){s->width, s->height}
2181                          );
2182                 }else{
2183                     s->avctx->sample_aspect_ratio=
2184                         av_div_q(
2185                          mpeg2_aspect[s->aspect_ratio_info],
2186                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
2187                         );
2188                 }
2189             }else{
2190                 s->avctx->sample_aspect_ratio=
2191                     mpeg2_aspect[s->aspect_ratio_info];
2192             }
2193         }//mpeg2
2194
2195         if(avctx->xvmc_acceleration){
2196             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2197         }else{
2198             if(s->chroma_format <  2){
2199                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2200             }else
2201             if(s->chroma_format == 2){
2202                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
2203             }else
2204             if(s->chroma_format >  2){
2205                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
2206             }
2207         }
2208         //until then pix_fmt may be changed right after codec init
2209         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2210             if( avctx->idct_algo == FF_IDCT_AUTO )
2211                 avctx->idct_algo = FF_IDCT_SIMPLE;
2212
2213         //quantization matrixes may need reordering
2214         //if dct permutation is changed
2215         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
2216
2217         if (MPV_common_init(s) < 0)
2218             return -2;
2219
2220         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
2221         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
2222         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
2223         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
2224
2225         s1->mpeg_enc_ctx_allocated = 1;
2226     }
2227     return 0;
2228 }
2229
2230 static int mpeg1_decode_picture(AVCodecContext *avctx,
2231                                 const uint8_t *buf, int buf_size)
2232 {
2233     Mpeg1Context *s1 = avctx->priv_data;
2234     MpegEncContext *s = &s1->mpeg_enc_ctx;
2235     int ref, f_code, vbv_delay;
2236
2237     if(mpeg_decode_postinit(s->avctx) < 0)
2238        return -2;
2239
2240     init_get_bits(&s->gb, buf, buf_size*8);
2241
2242     ref = get_bits(&s->gb, 10); /* temporal ref */
2243     s->pict_type = get_bits(&s->gb, 3);
2244     if(s->pict_type == 0 || s->pict_type > 3)
2245         return -1;
2246
2247     vbv_delay= get_bits(&s->gb, 16);
2248     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
2249         s->full_pel[0] = get_bits1(&s->gb);
2250         f_code = get_bits(&s->gb, 3);
2251         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2252             return -1;
2253         s->mpeg_f_code[0][0] = f_code;
2254         s->mpeg_f_code[0][1] = f_code;
2255     }
2256     if (s->pict_type == B_TYPE) {
2257         s->full_pel[1] = get_bits1(&s->gb);
2258         f_code = get_bits(&s->gb, 3);
2259         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
2260             return -1;
2261         s->mpeg_f_code[1][0] = f_code;
2262         s->mpeg_f_code[1][1] = f_code;
2263     }
2264     s->current_picture.pict_type= s->pict_type;
2265     s->current_picture.key_frame= s->pict_type == I_TYPE;
2266
2267     if(avctx->debug & FF_DEBUG_PICT_INFO)
2268         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
2269
2270     s->y_dc_scale = 8;
2271     s->c_dc_scale = 8;
2272     s->first_slice = 1;
2273     return 0;
2274 }
2275
2276 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
2277 {
2278     MpegEncContext *s= &s1->mpeg_enc_ctx;
2279     int horiz_size_ext, vert_size_ext;
2280     int bit_rate_ext;
2281
2282     skip_bits(&s->gb, 1); /* profil and level esc*/
2283     s->avctx->profile= get_bits(&s->gb, 3);
2284     s->avctx->level= get_bits(&s->gb, 4);
2285     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
2286     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
2287     horiz_size_ext = get_bits(&s->gb, 2);
2288     vert_size_ext = get_bits(&s->gb, 2);
2289     s->width |= (horiz_size_ext << 12);
2290     s->height |= (vert_size_ext << 12);
2291     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
2292     s->bit_rate += (bit_rate_ext << 18) * 400;
2293     skip_bits1(&s->gb); /* marker */
2294     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
2295
2296     s->low_delay = get_bits1(&s->gb);
2297     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2298
2299     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
2300     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
2301
2302     dprintf(s->avctx, "sequence extension\n");
2303     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2304     s->avctx->sub_id = 2; /* indicates mpeg2 found */
2305
2306     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2307         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
2308                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
2309
2310 }
2311
2312 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
2313 {
2314     MpegEncContext *s= &s1->mpeg_enc_ctx;
2315     int color_description, w, h;
2316
2317     skip_bits(&s->gb, 3); /* video format */
2318     color_description= get_bits1(&s->gb);
2319     if(color_description){
2320         skip_bits(&s->gb, 8); /* color primaries */
2321         skip_bits(&s->gb, 8); /* transfer_characteristics */
2322         skip_bits(&s->gb, 8); /* matrix_coefficients */
2323     }
2324     w= get_bits(&s->gb, 14);
2325     skip_bits(&s->gb, 1); //marker
2326     h= get_bits(&s->gb, 14);
2327     skip_bits(&s->gb, 1); //marker
2328
2329     s1->pan_scan.width= 16*w;
2330     s1->pan_scan.height=16*h;
2331
2332     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2333         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
2334 }
2335
2336 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
2337 {
2338     MpegEncContext *s= &s1->mpeg_enc_ctx;
2339     int i,nofco;
2340
2341     nofco = 1;
2342     if(s->progressive_sequence){
2343         if(s->repeat_first_field){
2344             nofco++;
2345             if(s->top_field_first)
2346                 nofco++;
2347         }
2348     }else{
2349         if(s->picture_structure == PICT_FRAME){
2350             nofco++;
2351             if(s->repeat_first_field)
2352                 nofco++;
2353         }
2354     }
2355     for(i=0; i<nofco; i++){
2356         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
2357         skip_bits(&s->gb, 1); //marker
2358         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
2359         skip_bits(&s->gb, 1); //marker
2360     }
2361
2362     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2363         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
2364             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
2365             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
2366             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
2367         );
2368 }
2369
2370 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
2371 {
2372     int i, v, j;
2373
2374     dprintf(s->avctx, "matrix extension\n");
2375
2376     if (get_bits1(&s->gb)) {
2377         for(i=0;i<64;i++) {
2378             v = get_bits(&s->gb, 8);
2379             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2380             s->intra_matrix[j] = v;
2381             s->chroma_intra_matrix[j] = v;
2382         }
2383     }
2384     if (get_bits1(&s->gb)) {
2385         for(i=0;i<64;i++) {
2386             v = get_bits(&s->gb, 8);
2387             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2388             s->inter_matrix[j] = v;
2389             s->chroma_inter_matrix[j] = v;
2390         }
2391     }
2392     if (get_bits1(&s->gb)) {
2393         for(i=0;i<64;i++) {
2394             v = get_bits(&s->gb, 8);
2395             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2396             s->chroma_intra_matrix[j] = v;
2397         }
2398     }
2399     if (get_bits1(&s->gb)) {
2400         for(i=0;i<64;i++) {
2401             v = get_bits(&s->gb, 8);
2402             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2403             s->chroma_inter_matrix[j] = v;
2404         }
2405     }
2406 }
2407
2408 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
2409 {
2410     s->full_pel[0] = s->full_pel[1] = 0;
2411     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
2412     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
2413     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
2414     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
2415     s->intra_dc_precision = get_bits(&s->gb, 2);
2416     s->picture_structure = get_bits(&s->gb, 2);
2417     s->top_field_first = get_bits1(&s->gb);
2418     s->frame_pred_frame_dct = get_bits1(&s->gb);
2419     s->concealment_motion_vectors = get_bits1(&s->gb);
2420     s->q_scale_type = get_bits1(&s->gb);
2421     s->intra_vlc_format = get_bits1(&s->gb);
2422     s->alternate_scan = get_bits1(&s->gb);
2423     s->repeat_first_field = get_bits1(&s->gb);
2424     s->chroma_420_type = get_bits1(&s->gb);
2425     s->progressive_frame = get_bits1(&s->gb);
2426
2427     if(s->picture_structure == PICT_FRAME){
2428         s->first_field=0;
2429         s->v_edge_pos= 16*s->mb_height;
2430     }else{
2431         s->first_field ^= 1;
2432         s->v_edge_pos=  8*s->mb_height;
2433         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
2434     }
2435
2436     if(s->alternate_scan){
2437         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
2438         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
2439     }else{
2440         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
2441         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
2442     }
2443
2444     /* composite display not parsed */
2445     dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
2446     dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
2447     dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
2448     dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
2449     dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
2450     dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
2451     dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
2452     dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
2453     dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
2454 }
2455
2456 static void mpeg_decode_extension(AVCodecContext *avctx,
2457                                   const uint8_t *buf, int buf_size)
2458 {
2459     Mpeg1Context *s1 = avctx->priv_data;
2460     MpegEncContext *s = &s1->mpeg_enc_ctx;
2461     int ext_type;
2462
2463     init_get_bits(&s->gb, buf, buf_size*8);
2464
2465     ext_type = get_bits(&s->gb, 4);
2466     switch(ext_type) {
2467     case 0x1:
2468         mpeg_decode_sequence_extension(s1);
2469         break;
2470     case 0x2:
2471         mpeg_decode_sequence_display_extension(s1);
2472         break;
2473     case 0x3:
2474         mpeg_decode_quant_matrix_extension(s);
2475         break;
2476     case 0x7:
2477         mpeg_decode_picture_display_extension(s1);
2478         break;
2479     case 0x8:
2480         mpeg_decode_picture_coding_extension(s);
2481         break;
2482     }
2483 }
2484
2485 static void exchange_uv(MpegEncContext *s){
2486     short * tmp = s->pblocks[4];
2487     s->pblocks[4] = s->pblocks[5];
2488     s->pblocks[5] = tmp;
2489 }
2490
2491 static int mpeg_field_start(MpegEncContext *s){
2492     AVCodecContext *avctx= s->avctx;
2493     Mpeg1Context *s1 = (Mpeg1Context*)s;
2494
2495     /* start frame decoding */
2496     if(s->first_field || s->picture_structure==PICT_FRAME){
2497         if(MPV_frame_start(s, avctx) < 0)
2498             return -1;
2499
2500         ff_er_frame_start(s);
2501
2502         /* first check if we must repeat the frame */
2503         s->current_picture_ptr->repeat_pict = 0;
2504         if (s->repeat_first_field) {
2505             if (s->progressive_sequence) {
2506                 if (s->top_field_first)
2507                     s->current_picture_ptr->repeat_pict = 4;
2508                 else
2509                     s->current_picture_ptr->repeat_pict = 2;
2510             } else if (s->progressive_frame) {
2511                 s->current_picture_ptr->repeat_pict = 1;
2512             }
2513         }
2514
2515         *s->current_picture_ptr->pan_scan= s1->pan_scan;
2516     }else{ //second field
2517             int i;
2518
2519             if(!s->current_picture_ptr){
2520                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2521                 return -1;
2522             }
2523
2524             for(i=0; i<4; i++){
2525                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
2526                 if(s->picture_structure == PICT_BOTTOM_FIELD){
2527                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2528                 }
2529             }
2530     }
2531 #ifdef HAVE_XVMC
2532 // MPV_frame_start will call this function too,
2533 // but we need to call it on every field
2534     if(s->avctx->xvmc_acceleration)
2535          XVMC_field_start(s,avctx);
2536 #endif
2537
2538     return 0;
2539 }
2540
2541 #define DECODE_SLICE_ERROR -1
2542 #define DECODE_SLICE_OK 0
2543
2544 /**
2545  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
2546  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
2547  *         DECODE_SLICE_OK if this slice is ok<br>
2548  */
2549 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
2550                              const uint8_t **buf, int buf_size)
2551 {
2552     MpegEncContext *s = &s1->mpeg_enc_ctx;
2553     AVCodecContext *avctx= s->avctx;
2554     int ret;
2555     const int field_pic= s->picture_structure != PICT_FRAME;
2556     const int lowres= s->avctx->lowres;
2557
2558     s->resync_mb_x=
2559     s->resync_mb_y= -1;
2560
2561     if (mb_y<<field_pic >= s->mb_height){
2562         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
2563         return -1;
2564     }
2565
2566     init_get_bits(&s->gb, *buf, buf_size*8);
2567
2568     ff_mpeg1_clean_buffers(s);
2569     s->interlaced_dct = 0;
2570
2571     s->qscale = get_qscale(s);
2572
2573     if(s->qscale == 0){
2574         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2575         return -1;
2576     }
2577
2578     /* extra slice info */
2579     while (get_bits1(&s->gb) != 0) {
2580         skip_bits(&s->gb, 8);
2581     }
2582
2583     s->mb_x=0;
2584
2585     for(;;) {
2586         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2587         if (code < 0){
2588             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2589             return -1;
2590         }
2591         if (code >= 33) {
2592             if (code == 33) {
2593                 s->mb_x += 33;
2594             }
2595             /* otherwise, stuffing, nothing to do */
2596         } else {
2597             s->mb_x += code;
2598             break;
2599         }
2600     }
2601     if(s->mb_x >= (unsigned)s->mb_width){
2602         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
2603         return -1;
2604     }
2605
2606     s->resync_mb_x= s->mb_x;
2607     s->resync_mb_y= s->mb_y= mb_y;
2608     s->mb_skip_run= 0;
2609     ff_init_block_index(s);
2610
2611     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
2612         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2613              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",
2614                  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],
2615                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
2616                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
2617                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2618                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2619         }
2620     }
2621
2622     for(;;) {
2623 #ifdef HAVE_XVMC
2624         //one 1 we memcpy blocks in xvmcvideo
2625         if(s->avctx->xvmc_acceleration > 1)
2626             XVMC_init_block(s);//set s->block
2627 #endif
2628
2629         ret = mpeg_decode_mb(s, s->block);
2630         s->chroma_qscale= s->qscale;
2631
2632         dprintf(s->avctx, "ret=%d\n", ret);
2633         if (ret < 0)
2634             return -1;
2635
2636         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2637             const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
2638             int xy = s->mb_x*2 + s->mb_y*2*wrap;
2639             int motion_x, motion_y, dir, i;
2640             if(field_pic && !s->first_field)
2641                 xy += wrap/2;
2642
2643             for(i=0; i<2; i++){
2644                 for(dir=0; dir<2; dir++){
2645                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
2646                         motion_x = motion_y = 0;
2647                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
2648                         motion_x = s->mv[dir][0][0];
2649                         motion_y = s->mv[dir][0][1];
2650                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2651                         motion_x = s->mv[dir][i][0];
2652                         motion_y = s->mv[dir][i][1];
2653                     }
2654
2655                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
2656                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
2657                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
2658                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
2659                     s->current_picture.ref_index [dir][xy    ]=
2660                     s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
2661                     assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
2662                 }
2663                 xy += wrap;
2664             }
2665         }
2666
2667         s->dest[0] += 16 >> lowres;
2668         s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
2669         s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
2670
2671         MPV_decode_mb(s, s->block);
2672
2673         if (++s->mb_x >= s->mb_width) {
2674             const int mb_size= 16>>s->avctx->lowres;
2675
2676             ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
2677
2678             s->mb_x = 0;
2679             s->mb_y++;
2680
2681             if(s->mb_y<<field_pic >= s->mb_height){
2682                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2683                 int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
2684                             && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
2685                             && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
2686
2687                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
2688                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2689                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
2690                     return -1;
2691                 }else
2692                     goto eos;
2693             }
2694
2695             ff_init_block_index(s);
2696         }
2697
2698         /* skip mb handling */
2699         if (s->mb_skip_run == -1) {
2700             /* read again increment */
2701             s->mb_skip_run = 0;
2702             for(;;) {
2703                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2704                 if (code < 0){
2705                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2706                     return -1;
2707                 }
2708                 if (code >= 33) {
2709                     if (code == 33) {
2710                         s->mb_skip_run += 33;
2711                     }else if(code == 35){
2712                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2713                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2714                             return -1;
2715                         }
2716                         goto eos; /* end of slice */
2717                     }
2718                     /* otherwise, stuffing, nothing to do */
2719                 } else {
2720                     s->mb_skip_run += code;
2721                     break;
2722                 }
2723             }
2724         }
2725     }
2726 eos: // end of slice
2727     *buf += get_bits_count(&s->gb)/8 - 1;
2728 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2729     return 0;
2730 }
2731
2732 static int slice_decode_thread(AVCodecContext *c, void *arg){
2733     MpegEncContext *s= arg;
2734     const uint8_t *buf= s->gb.buffer;
2735     int mb_y= s->start_mb_y;
2736
2737     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
2738
2739     for(;;){
2740         uint32_t start_code;
2741         int ret;
2742
2743         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
2744         emms_c();
2745 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2746 //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);
2747         if(ret < 0){
2748             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
2749                 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);
2750         }else{
2751             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);
2752         }
2753
2754         if(s->mb_y == s->end_mb_y)
2755             return 0;
2756
2757         start_code= -1;
2758         buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
2759         mb_y= start_code - SLICE_MIN_START_CODE;
2760         if(mb_y < 0 || mb_y >= s->end_mb_y)
2761             return -1;
2762     }
2763
2764     return 0; //not reached
2765 }
2766
2767 /**
2768  * handles slice ends.
2769  * @return 1 if it seems to be the last slice of
2770  */
2771 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2772 {
2773     Mpeg1Context *s1 = avctx->priv_data;
2774     MpegEncContext *s = &s1->mpeg_enc_ctx;
2775
2776     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2777         return 0;
2778
2779 #ifdef HAVE_XVMC
2780     if(s->avctx->xvmc_acceleration)
2781         XVMC_field_end(s);
2782 #endif
2783     /* end of slice reached */
2784     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2785         /* end of image */
2786
2787         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2788
2789         ff_er_frame_end(s);
2790
2791         MPV_frame_end(s);
2792
2793         if (s->pict_type == B_TYPE || s->low_delay) {
2794             *pict= *(AVFrame*)s->current_picture_ptr;
2795             ff_print_debug_info(s, pict);
2796         } else {
2797             s->picture_number++;
2798             /* latency of 1 frame for I and P frames */
2799             /* XXX: use another variable than picture_number */
2800             if (s->last_picture_ptr != NULL) {
2801                 *pict= *(AVFrame*)s->last_picture_ptr;
2802                  ff_print_debug_info(s, pict);
2803             }
2804         }
2805
2806         return 1;
2807     } else {
2808         return 0;
2809     }
2810 }
2811
2812 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2813                                  const uint8_t *buf, int buf_size)
2814 {
2815     Mpeg1Context *s1 = avctx->priv_data;
2816     MpegEncContext *s = &s1->mpeg_enc_ctx;
2817     int width,height;
2818     int i, v, j;
2819
2820     init_get_bits(&s->gb, buf, buf_size*8);
2821
2822     width = get_bits(&s->gb, 12);
2823     height = get_bits(&s->gb, 12);
2824     if (width <= 0 || height <= 0 ||
2825         (width % 2) != 0 || (height % 2) != 0)
2826         return -1;
2827     s->aspect_ratio_info= get_bits(&s->gb, 4);
2828     if (s->aspect_ratio_info == 0)
2829         return -1;
2830     s->frame_rate_index = get_bits(&s->gb, 4);
2831     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2832         return -1;
2833     s->bit_rate = get_bits(&s->gb, 18) * 400;
2834     if (get_bits1(&s->gb) == 0) /* marker */
2835         return -1;
2836     s->width = width;
2837     s->height = height;
2838
2839     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2840     skip_bits(&s->gb, 1);
2841
2842     /* get matrix */
2843     if (get_bits1(&s->gb)) {
2844         for(i=0;i<64;i++) {
2845             v = get_bits(&s->gb, 8);
2846             if(v==0){
2847                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2848                 return -1;
2849             }
2850             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2851             s->intra_matrix[j] = v;
2852             s->chroma_intra_matrix[j] = v;
2853         }
2854 #ifdef DEBUG
2855         dprintf(s->avctx, "intra matrix present\n");
2856         for(i=0;i<64;i++)
2857             dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2858         dprintf(s->avctx, "\n");
2859 #endif
2860     } else {
2861         for(i=0;i<64;i++) {
2862             j = s->dsp.idct_permutation[i];
2863             v = ff_mpeg1_default_intra_matrix[i];
2864             s->intra_matrix[j] = v;
2865             s->chroma_intra_matrix[j] = v;
2866         }
2867     }
2868     if (get_bits1(&s->gb)) {
2869         for(i=0;i<64;i++) {
2870             v = get_bits(&s->gb, 8);
2871             if(v==0){
2872                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2873                 return -1;
2874             }
2875             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2876             s->inter_matrix[j] = v;
2877             s->chroma_inter_matrix[j] = v;
2878         }
2879 #ifdef DEBUG
2880         dprintf(s->avctx, "non intra matrix present\n");
2881         for(i=0;i<64;i++)
2882             dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2883         dprintf(s->avctx, "\n");
2884 #endif
2885     } else {
2886         for(i=0;i<64;i++) {
2887             int j= s->dsp.idct_permutation[i];
2888             v = ff_mpeg1_default_non_intra_matrix[i];
2889             s->inter_matrix[j] = v;
2890             s->chroma_inter_matrix[j] = v;
2891         }
2892     }
2893
2894     if(show_bits(&s->gb, 23) != 0){
2895         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2896         return -1;
2897     }
2898
2899     /* we set mpeg2 parameters so that it emulates mpeg1 */
2900     s->progressive_sequence = 1;
2901     s->progressive_frame = 1;
2902     s->picture_structure = PICT_FRAME;
2903     s->frame_pred_frame_dct = 1;
2904     s->chroma_format = 1;
2905     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2906     avctx->sub_id = 1; /* indicates mpeg1 */
2907     s->out_format = FMT_MPEG1;
2908     s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2909     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2910
2911     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2912         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2913                s->avctx->rc_buffer_size, s->bit_rate);
2914
2915     return 0;
2916 }
2917
2918 static int vcr2_init_sequence(AVCodecContext *avctx)
2919 {
2920     Mpeg1Context *s1 = avctx->priv_data;
2921     MpegEncContext *s = &s1->mpeg_enc_ctx;
2922     int i, v;
2923
2924     /* start new mpeg1 context decoding */
2925     s->out_format = FMT_MPEG1;
2926     if (s1->mpeg_enc_ctx_allocated) {
2927         MPV_common_end(s);
2928     }
2929     s->width  = avctx->coded_width;
2930     s->height = avctx->coded_height;
2931     avctx->has_b_frames= 0; //true?
2932     s->low_delay= 1;
2933
2934     if(avctx->xvmc_acceleration){
2935         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2936     }else{
2937         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2938     }
2939
2940     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2941         if( avctx->idct_algo == FF_IDCT_AUTO )
2942             avctx->idct_algo = FF_IDCT_SIMPLE;
2943
2944     if (MPV_common_init(s) < 0)
2945         return -1;
2946     exchange_uv(s);//common init reset pblocks, so we swap them here
2947     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2948     s1->mpeg_enc_ctx_allocated = 1;
2949
2950     for(i=0;i<64;i++) {
2951         int j= s->dsp.idct_permutation[i];
2952         v = ff_mpeg1_default_intra_matrix[i];
2953         s->intra_matrix[j] = v;
2954         s->chroma_intra_matrix[j] = v;
2955
2956         v = ff_mpeg1_default_non_intra_matrix[i];
2957         s->inter_matrix[j] = v;
2958         s->chroma_inter_matrix[j] = v;
2959     }
2960
2961     s->progressive_sequence = 1;
2962     s->progressive_frame = 1;
2963     s->picture_structure = PICT_FRAME;
2964     s->frame_pred_frame_dct = 1;
2965     s->chroma_format = 1;
2966     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2967     avctx->sub_id = 2; /* indicates mpeg2 */
2968     return 0;
2969 }
2970
2971
2972 static void mpeg_decode_user_data(AVCodecContext *avctx,
2973                                   const uint8_t *buf, int buf_size)
2974 {
2975     const uint8_t *p;
2976     int len, flags;
2977     p = buf;
2978     len = buf_size;
2979
2980     /* we parse the DTG active format information */
2981     if (len >= 5 &&
2982         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2983         flags = p[4];
2984         p += 5;
2985         len -= 5;
2986         if (flags & 0x80) {
2987             /* skip event id */
2988             if (len < 2)
2989                 return;
2990             p += 2;
2991             len -= 2;
2992         }
2993         if (flags & 0x40) {
2994             if (len < 1)
2995                 return;
2996             avctx->dtg_active_format = p[0] & 0x0f;
2997         }
2998     }
2999 }
3000
3001 static void mpeg_decode_gop(AVCodecContext *avctx,
3002                             const uint8_t *buf, int buf_size){
3003     Mpeg1Context *s1 = avctx->priv_data;
3004     MpegEncContext *s = &s1->mpeg_enc_ctx;
3005
3006     int drop_frame_flag;
3007     int time_code_hours, time_code_minutes;
3008     int time_code_seconds, time_code_pictures;
3009     int broken_link;
3010
3011     init_get_bits(&s->gb, buf, buf_size*8);
3012
3013     drop_frame_flag = get_bits1(&s->gb);
3014
3015     time_code_hours=get_bits(&s->gb,5);
3016     time_code_minutes = get_bits(&s->gb,6);
3017     skip_bits1(&s->gb);//marker bit
3018     time_code_seconds = get_bits(&s->gb,6);
3019     time_code_pictures = get_bits(&s->gb,6);
3020
3021     /*broken_link indicate that after editing the
3022       reference frames of the first B-Frames after GOP I-Frame
3023       are missing (open gop)*/
3024     broken_link = get_bits1(&s->gb);
3025
3026     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
3027         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
3028             time_code_hours, time_code_minutes, time_code_seconds,
3029             time_code_pictures, broken_link);
3030 }
3031 /**
3032  * finds the end of the current frame in the bitstream.
3033  * @return the position of the first byte of the next frame, or -1
3034  */
3035 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
3036 {
3037     int i;
3038     uint32_t state= pc->state;
3039
3040     i=0;
3041     if(!pc->frame_start_found){
3042         for(i=0; i<buf_size; i++){
3043             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3044             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
3045                 i++;
3046                 pc->frame_start_found=1;
3047                 break;
3048             }
3049         }
3050     }
3051
3052     if(pc->frame_start_found){
3053         /* EOF considered as end of frame */
3054         if (buf_size == 0)
3055             return 0;
3056         for(; i<buf_size; i++){
3057             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
3058             if((state&0xFFFFFF00) == 0x100){
3059                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
3060                     pc->frame_start_found=0;
3061                     pc->state=-1;
3062                     return i-3;
3063                 }
3064             }
3065         }
3066     }
3067     pc->state= state;
3068     return END_NOT_FOUND;
3069 }
3070
3071 /* handle buffering and image synchronisation */
3072 static int mpeg_decode_frame(AVCodecContext *avctx,
3073                              void *data, int *data_size,
3074                              uint8_t *buf, int buf_size)
3075 {
3076     Mpeg1Context *s = avctx->priv_data;
3077     const uint8_t *buf_end;
3078     const uint8_t *buf_ptr;
3079     uint32_t start_code;
3080     int ret, input_size;
3081     AVFrame *picture = data;
3082     MpegEncContext *s2 = &s->mpeg_enc_ctx;
3083     dprintf(avctx, "fill_buffer\n");
3084
3085     if (buf_size == 0) {
3086         /* special case for last picture */
3087         if (s2->low_delay==0 && s2->next_picture_ptr) {
3088             *picture= *(AVFrame*)s2->next_picture_ptr;
3089             s2->next_picture_ptr= NULL;
3090
3091             *data_size = sizeof(AVFrame);
3092         }
3093         return 0;
3094     }
3095
3096     if(s2->flags&CODEC_FLAG_TRUNCATED){
3097         int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
3098
3099         if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
3100             return buf_size;
3101     }
3102
3103     buf_ptr = buf;
3104     buf_end = buf + buf_size;
3105
3106 #if 0
3107     if (s->repeat_field % 2 == 1) {
3108         s->repeat_field++;
3109         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
3110         //        s2->picture_number, s->repeat_field);
3111         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
3112             *data_size = sizeof(AVPicture);
3113             goto the_end;
3114         }
3115     }
3116 #endif
3117
3118     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
3119         vcr2_init_sequence(avctx);
3120
3121     s->slice_count= 0;
3122
3123     for(;;) {
3124         /* find start next code */
3125         start_code = -1;
3126         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
3127         if (start_code > 0x1ff){
3128             if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
3129                 if(avctx->thread_count > 1){
3130                     int i;
3131
3132                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
3133                     for(i=0; i<s->slice_count; i++)
3134                         s2->error_count += s2->thread_context[i]->error_count;
3135                 }
3136                 if (slice_end(avctx, picture)) {
3137                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
3138                         *data_size = sizeof(AVPicture);
3139                 }
3140             }
3141             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
3142         }
3143
3144         input_size = buf_end - buf_ptr;
3145
3146         if(avctx->debug & FF_DEBUG_STARTCODE){
3147             av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
3148         }
3149
3150         /* prepare data for next start code */
3151         switch(start_code) {
3152         case SEQ_START_CODE:
3153             mpeg1_decode_sequence(avctx, buf_ptr,
3154                                     input_size);
3155             break;
3156
3157         case PICTURE_START_CODE:
3158             /* we have a complete image : we try to decompress it */
3159             mpeg1_decode_picture(avctx,
3160                                     buf_ptr, input_size);
3161             break;
3162         case EXT_START_CODE:
3163             mpeg_decode_extension(avctx,
3164                                     buf_ptr, input_size);
3165             break;
3166         case USER_START_CODE:
3167             mpeg_decode_user_data(avctx,
3168                                     buf_ptr, input_size);
3169             break;
3170         case GOP_START_CODE:
3171             s2->first_field=0;
3172             mpeg_decode_gop(avctx,
3173                                     buf_ptr, input_size);
3174             break;
3175         default:
3176             if (start_code >= SLICE_MIN_START_CODE &&
3177                 start_code <= SLICE_MAX_START_CODE) {
3178                 int mb_y= start_code - SLICE_MIN_START_CODE;
3179
3180                 if(s2->last_picture_ptr==NULL){
3181                 /* skip b frames if we dont have reference frames */
3182                     if(s2->pict_type==B_TYPE) break;
3183                 /* skip P frames if we dont have reference frame no valid header */
3184 //                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
3185                 }
3186                 /* skip b frames if we are in a hurry */
3187                 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
3188                 if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
3189                     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
3190                     || avctx->skip_frame >= AVDISCARD_ALL)
3191                     break;
3192                 /* skip everything if we are in a hurry>=5 */
3193                 if(avctx->hurry_up>=5) break;
3194
3195                 if (!s->mpeg_enc_ctx_allocated) break;
3196
3197                 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
3198                     if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
3199                         break;
3200                 }
3201
3202                 if(s2->first_slice){
3203                     s2->first_slice=0;
3204                             if(mpeg_field_start(s2) < 0)
3205                         return -1;
3206                     }
3207                 if(!s2->current_picture_ptr){
3208                     av_log(avctx, AV_LOG_ERROR, "current_picture not initalized\n");
3209                     return -1;
3210                 }
3211
3212                 if(avctx->thread_count > 1){
3213                     int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
3214                     if(threshold <= mb_y){
3215                         MpegEncContext *thread_context= s2->thread_context[s->slice_count];
3216
3217                         thread_context->start_mb_y= mb_y;
3218                         thread_context->end_mb_y  = s2->mb_height;
3219                         if(s->slice_count){
3220                             s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
3221                             ff_update_duplicate_context(thread_context, s2);
3222                         }
3223                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
3224                         s->slice_count++;
3225                     }
3226                     buf_ptr += 2; //FIXME add minimum num of bytes per slice
3227                 }else{
3228                     ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
3229                     emms_c();
3230
3231                     if(ret < 0){
3232                         if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
3233                             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);
3234                     }else{
3235                         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);
3236                     }
3237                 }
3238             }
3239             break;
3240         }
3241     }
3242 }
3243
3244 static int mpeg_decode_end(AVCodecContext *avctx)
3245 {
3246     Mpeg1Context *s = avctx->priv_data;
3247
3248     if (s->mpeg_enc_ctx_allocated)
3249         MPV_common_end(&s->mpeg_enc_ctx);
3250     return 0;
3251 }
3252
3253 AVCodec mpeg1video_decoder = {
3254     "mpeg1video",
3255     CODEC_TYPE_VIDEO,
3256     CODEC_ID_MPEG1VIDEO,
3257     sizeof(Mpeg1Context),
3258     mpeg_decode_init,
3259     NULL,
3260     mpeg_decode_end,
3261     mpeg_decode_frame,
3262     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3263     .flush= ff_mpeg_flush,
3264 };
3265
3266 AVCodec mpeg2video_decoder = {
3267     "mpeg2video",
3268     CODEC_TYPE_VIDEO,
3269     CODEC_ID_MPEG2VIDEO,
3270     sizeof(Mpeg1Context),
3271     mpeg_decode_init,
3272     NULL,
3273     mpeg_decode_end,
3274     mpeg_decode_frame,
3275     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3276     .flush= ff_mpeg_flush,
3277 };
3278
3279 //legacy decoder
3280 AVCodec mpegvideo_decoder = {
3281     "mpegvideo",
3282     CODEC_TYPE_VIDEO,
3283     CODEC_ID_MPEG2VIDEO,
3284     sizeof(Mpeg1Context),
3285     mpeg_decode_init,
3286     NULL,
3287     mpeg_decode_end,
3288     mpeg_decode_frame,
3289     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
3290     .flush= ff_mpeg_flush,
3291 };
3292
3293 #ifdef CONFIG_ENCODERS
3294
3295 AVCodec mpeg1video_encoder = {
3296     "mpeg1video",
3297     CODEC_TYPE_VIDEO,
3298     CODEC_ID_MPEG1VIDEO,
3299     sizeof(MpegEncContext),
3300     encode_init,
3301     MPV_encode_picture,
3302     MPV_encode_end,
3303     .supported_framerates= ff_frame_rate_tab+1,
3304     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
3305     .capabilities= CODEC_CAP_DELAY,
3306 };
3307
3308 AVCodec mpeg2video_encoder = {
3309     "mpeg2video",
3310     CODEC_TYPE_VIDEO,
3311     CODEC_ID_MPEG2VIDEO,
3312     sizeof(MpegEncContext),
3313     encode_init,
3314     MPV_encode_picture,
3315     MPV_encode_end,
3316     .supported_framerates= ff_frame_rate_tab+1,
3317     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, -1},
3318     .capabilities= CODEC_CAP_DELAY,
3319 };
3320 #endif
3321
3322 #ifdef HAVE_XVMC
3323 static int mpeg_mc_decode_init(AVCodecContext *avctx){
3324     Mpeg1Context *s;
3325
3326     if( avctx->thread_count > 1)
3327         return -1;
3328     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
3329         return -1;
3330     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
3331         dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
3332     }
3333     mpeg_decode_init(avctx);
3334     s = avctx->priv_data;
3335
3336     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
3337     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
3338
3339     return 0;
3340 }
3341
3342 AVCodec mpeg_xvmc_decoder = {
3343     "mpegvideo_xvmc",
3344     CODEC_TYPE_VIDEO,
3345     CODEC_ID_MPEG2VIDEO_XVMC,
3346     sizeof(Mpeg1Context),
3347     mpeg_mc_decode_init,
3348     NULL,
3349     mpeg_decode_end,
3350     mpeg_decode_frame,
3351     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
3352     .flush= ff_mpeg_flush,
3353 };
3354
3355 #endif
3356
3357 static int imx_dump_header(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
3358                            uint8_t **poutbuf, int *poutbuf_size,
3359                            const uint8_t *buf, int buf_size, int keyframe)
3360 {
3361     /* MXF essence element key */
3362     static const uint8_t imx_header[16] = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01,0x05,0x01,0x01,0x00 };
3363     uint8_t *poutbufp;
3364
3365     if (avctx->codec_id != CODEC_ID_MPEG2VIDEO) {
3366         av_log(avctx, AV_LOG_ERROR, "imx bitstream filter only applies to mpeg2video codec\n");
3367         return 0;
3368     }
3369
3370     *poutbuf = av_malloc(buf_size + 20 + FF_INPUT_BUFFER_PADDING_SIZE);
3371     poutbufp = *poutbuf;
3372     bytestream_put_buffer(&poutbufp, imx_header, 16);
3373     bytestream_put_byte(&poutbufp, 0x83); /* KLV BER long form */
3374     bytestream_put_be24(&poutbufp, buf_size);
3375     bytestream_put_buffer(&poutbufp, buf, buf_size);
3376     *poutbuf_size = poutbufp - *poutbuf;
3377     return 1;
3378 }
3379
3380 AVBitStreamFilter imx_dump_header_bsf = {
3381     "imxdump",
3382     0,
3383     imx_dump_header,
3384 };
3385
3386 /* this is ugly i know, but the alternative is too make
3387    hundreds of vars global and prefix them with ff_mpeg1_
3388    which is far uglier. */
3389 #include "mdec.c"