git.sesse.net Git - ffmpeg/blob - libavcodec/mpeg12enc.c

   1 /*
   2  * MPEG1/2 encoder
   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
  25  * MPEG1/2 encoder
  26  */
  27
  28 #include "avcodec.h"
  29 #include "dsputil.h"
  30 #include "mathops.h"
  31 #include "mpegvideo.h"
  32
  33 #include "mpeg12.h"
  34 #include "mpeg12data.h"
  35 #include "bytestream.h"
  36 #include "timecode.h"
  37 #include "libavutil/log.h"
  38 #include "libavutil/opt.h"
  39 #include "libavutil/avassert.h"
  40
  41 static const uint8_t inv_non_linear_qscale[13] = {
  42     0, 2, 4, 6, 8,
  43     9,10,11,12,13,14,15,16,
  44 };
  45
  46 static const uint8_t svcd_scan_offset_placeholder[14] = {
  47     0x10, 0x0E,
  48     0x00, 0x80, 0x81,
  49     0x00, 0x80, 0x81,
  50     0xff, 0xff, 0xff,
  51     0xff, 0xff, 0xff,
  52 };
  53
  54 static void mpeg1_encode_block(MpegEncContext *s,
  55                          DCTELEM *block,
  56                          int component);
  57 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
  58
  59 static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
  60 static uint8_t fcode_tab[MAX_MV*2+1];
  61
  62 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
  63 static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
  64
  65 /* simple include everything table for dc, first byte is bits number next 3 are code*/
  66 static uint32_t mpeg1_lum_dc_uni[512];
  67 static uint32_t mpeg1_chr_dc_uni[512];
  68
  69 static uint8_t mpeg1_index_run[2][64];
  70 static int8_t mpeg1_max_level[2][64];
  71
  72 static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
  73     int i;
  74
  75     for(i=0; i<128; i++){
  76         int level= i-64;
  77         int run;
  78         if (!level)
  79             continue;
  80         for(run=0; run<64; run++){
  81             int len, code;
  82
  83             int alevel= FFABS(level);
  84
  85             if (alevel > rl->max_level[0][run])
  86                 code= 111; /*rl->n*/
  87             else
  88                 code= rl->index_run[0][run] + alevel - 1;
  89
  90             if (code < 111 /* rl->n */) {
  91                 /* length of vlc and sign */
  92                 len=   rl->table_vlc[code][1]+1;
  93             } else {
  94                 len=  rl->table_vlc[111/*rl->n*/][1]+6;
  95
  96                 if (alevel < 128) {
  97                     len += 8;
  98                 } else {
  99                     len += 16;
 100                 }
 101             }
 102
 103             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
 104         }
 105     }
 106 }
 107
 108
 109 static int find_frame_rate_index(MpegEncContext *s){
 110     int i;
 111     int64_t dmin= INT64_MAX;
 112     int64_t d;
 113
 114     for(i=1;i<14;i++) {
 115         int64_t n0= 1001LL/avpriv_frame_rate_tab[i].den*avpriv_frame_rate_tab[i].num*s->avctx->time_base.num;
 116         int64_t n1= 1001LL*s->avctx->time_base.den;
 117         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL && i>=9) break;
 118
 119         d = FFABS(n0 - n1);
 120         if(d < dmin){
 121             dmin=d;
 122             s->frame_rate_index= i;
 123         }
 124     }
 125     if(dmin)
 126         return -1;
 127     else
 128         return 0;
 129 }
 130
 131 static av_cold int encode_init(AVCodecContext *avctx)
 132 {
 133     MpegEncContext *s = avctx->priv_data;
 134
 135     if(MPV_encode_init(avctx) < 0)
 136         return -1;
 137
 138 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
 139     if (avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE)
 140         s->drop_frame_timecode = 1;
 141     if (avctx->flags & CODEC_FLAG_SVCD_SCAN_OFFSET)
 142         s->scan_offset = 1;
 143 #endif
 144
 145     if(find_frame_rate_index(s) < 0){
 146         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
 147             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
 148             return -1;
 149         }else{
 150             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);
 151         }
 152     }
 153
 154     if(avctx->profile == FF_PROFILE_UNKNOWN){
 155         if(avctx->level != FF_LEVEL_UNKNOWN){
 156             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 157             return -1;
 158         }
 159         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
 160     }
 161
 162     if(avctx->level == FF_LEVEL_UNKNOWN){
 163         if(avctx->profile == 0){ /* 4:2:2 */
 164             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
 165             else                                            avctx->level = 2; /* High */
 166         }else{
 167             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
 168                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 169                 return -1;
 170             }
 171             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
 172             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
 173             else                                            avctx->level = 4; /* High */
 174         }
 175     }
 176
 177     s->drop_frame_timecode = s->tc.drop = s->drop_frame_timecode || !!(avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE);
 178     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 179         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 180         return -1;
 181     }
 182
 183     if (s->tc.str) {
 184         s->tc.rate = avpriv_frame_rate_tab[s->frame_rate_index];
 185         if (ff_init_smtpe_timecode(s, &s->tc) < 0)
 186             return -1;
 187         s->avctx->timecode_frame_start = s->tc.start;
 188     }
 189     return 0;
 190 }
 191
 192 static void put_header(MpegEncContext *s, int header)
 193 {
 194     avpriv_align_put_bits(&s->pb);
 195     put_bits(&s->pb, 16, header>>16);
 196     put_sbits(&s->pb, 16, header);
 197 }
 198
 199 /* put sequence header if needed */
 200 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 201 {
 202         unsigned int vbv_buffer_size;
 203         unsigned int fps, v;
 204         int i;
 205         uint64_t time_code;
 206         float best_aspect_error= 1E10;
 207         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 208         int constraint_parameter_flag;
 209
 210         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 211
 212         if (s->current_picture.f.key_frame) {
 213             AVRational framerate= avpriv_frame_rate_tab[s->frame_rate_index];
 214
 215             /* mpeg1 header repeated every gop */
 216             put_header(s, SEQ_START_CODE);
 217
 218             put_sbits(&s->pb, 12, s->width );
 219             put_sbits(&s->pb, 12, s->height);
 220
 221             for(i=1; i<15; i++){
 222                 float error= aspect_ratio;
 223                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
 224                     error-= 1.0/ff_mpeg1_aspect[i];
 225                 else
 226                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
 227
 228                 error= FFABS(error);
 229
 230                 if(error < best_aspect_error){
 231                     best_aspect_error= error;
 232                     s->aspect_ratio_info= i;
 233                 }
 234             }
 235
 236             put_bits(&s->pb, 4, s->aspect_ratio_info);
 237             put_bits(&s->pb, 4, s->frame_rate_index);
 238
 239             if(s->avctx->rc_max_rate){
 240                 v = (s->avctx->rc_max_rate + 399) / 400;
 241                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
 242                     v = 0x3ffff;
 243             }else{
 244                 v= 0x3FFFF;
 245             }
 246
 247             if(s->avctx->rc_buffer_size)
 248                 vbv_buffer_size = s->avctx->rc_buffer_size;
 249             else
 250                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 251                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 252             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 253
 254             put_sbits(&s->pb, 18, v);
 255             put_bits(&s->pb, 1, 1); /* marker */
 256             put_sbits(&s->pb, 10, vbv_buffer_size);
 257
 258             constraint_parameter_flag=
 259                 s->width <= 768 && s->height <= 576 &&
 260                 s->mb_width * s->mb_height <= 396 &&
 261                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 262                 framerate.num <= framerate.den*30 &&
 263                 s->avctx->me_range && s->avctx->me_range < 128 &&
 264                 vbv_buffer_size <= 20 &&
 265                 v <= 1856000/400 &&
 266                 s->codec_id == CODEC_ID_MPEG1VIDEO;
 267
 268             put_bits(&s->pb, 1, constraint_parameter_flag);
 269
 270             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 271             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 272
 273             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 274                 put_header(s, EXT_START_CODE);
 275                 put_bits(&s->pb, 4, 1); //seq ext
 276
 277                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 278
 279                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 280                 put_bits(&s->pb, 4, s->avctx->level); //level
 281
 282                 put_bits(&s->pb, 1, s->progressive_sequence);
 283                 put_bits(&s->pb, 2, s->chroma_format);
 284                 put_bits(&s->pb, 2, s->width >>12);
 285                 put_bits(&s->pb, 2, s->height>>12);
 286                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 287                 put_bits(&s->pb, 1, 1); //marker
 288                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 289                 put_bits(&s->pb, 1, s->low_delay);
 290                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
 291                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
 292             }
 293
 294             put_header(s, GOP_START_CODE);
 295             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
 296             /* time code : we must convert from the real frame rate to a
 297                fake mpeg frame rate in case of low frame rate */
 298             fps = (framerate.num + framerate.den/2)/ framerate.den;
 299             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
 300
 301             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 302             av_assert0(s->drop_frame_timecode == s->tc.drop);
 303             if (s->tc.drop)
 304                 time_code = ff_framenum_to_drop_timecode(time_code);
 305             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 306             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 307             put_bits(&s->pb, 1, 1);
 308             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 309             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 310             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 311             put_bits(&s->pb, 1, 0); /* broken link */
 312         }
 313 }
 314
 315 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 316     while (run >= 33) {
 317         put_bits(&s->pb, 11, 0x008);
 318         run -= 33;
 319     }
 320     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 321              ff_mpeg12_mbAddrIncrTable[run][0]);
 322 }
 323
 324 static av_always_inline void put_qscale(MpegEncContext *s)
 325 {
 326     if(s->q_scale_type){
 327         assert(s->qscale>=1 && s->qscale <=12);
 328         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 329     }else{
 330         put_bits(&s->pb, 5, s->qscale);
 331     }
 332 }
 333
 334 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 335     if (s->height > 2800) {
 336         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 337         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
 338     } else {
 339         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 340     }
 341     put_qscale(s);
 342     put_bits(&s->pb, 1, 0); /* slice extra information */
 343 }
 344
 345 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 346 {
 347     mpeg1_encode_sequence_header(s);
 348
 349     /* mpeg1 picture header */
 350     put_header(s, PICTURE_START_CODE);
 351     /* temporal reference */
 352
 353     // RAL: s->picture_number instead of s->fake_picture_number
 354     put_bits(&s->pb, 10, (s->picture_number -
 355                           s->gop_picture_number) & 0x3ff);
 356     put_bits(&s->pb, 3, s->pict_type);
 357
 358     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 359     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 360
 361     // RAL: Forward f_code also needed for B frames
 362     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 363         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 364         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 365             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 366         else
 367             put_bits(&s->pb, 3, 7); /* forward_f_code */
 368     }
 369
 370     // RAL: Backward f_code necessary for B frames
 371     if (s->pict_type == AV_PICTURE_TYPE_B) {
 372         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 373         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 374             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 375         else
 376             put_bits(&s->pb, 3, 7); /* backward_f_code */
 377     }
 378
 379     put_bits(&s->pb, 1, 0); /* extra bit picture */
 380
 381     s->frame_pred_frame_dct = 1;
 382     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 383         put_header(s, EXT_START_CODE);
 384         put_bits(&s->pb, 4, 8); //pic ext
 385         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 386             put_bits(&s->pb, 4, s->f_code);
 387             put_bits(&s->pb, 4, s->f_code);
 388         }else{
 389             put_bits(&s->pb, 8, 255);
 390         }
 391         if (s->pict_type == AV_PICTURE_TYPE_B) {
 392             put_bits(&s->pb, 4, s->b_code);
 393             put_bits(&s->pb, 4, s->b_code);
 394         }else{
 395             put_bits(&s->pb, 8, 255);
 396         }
 397         put_bits(&s->pb, 2, s->intra_dc_precision);
 398
 399         assert(s->picture_structure == PICT_FRAME);
 400         put_bits(&s->pb, 2, s->picture_structure);
 401         if (s->progressive_sequence) {
 402             put_bits(&s->pb, 1, 0); /* no repeat */
 403         } else {
 404             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 405         }
 406         /* XXX: optimize the generation of this flag with entropy
 407            measures */
 408         s->frame_pred_frame_dct = s->progressive_sequence;
 409
 410         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 411         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 412         put_bits(&s->pb, 1, s->q_scale_type);
 413         put_bits(&s->pb, 1, s->intra_vlc_format);
 414         put_bits(&s->pb, 1, s->alternate_scan);
 415         put_bits(&s->pb, 1, s->repeat_first_field);
 416         s->progressive_frame = s->progressive_sequence;
 417         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 418         put_bits(&s->pb, 1, s->progressive_frame);
 419         put_bits(&s->pb, 1, 0); //composite_display_flag
 420     }
 421     if (s->scan_offset) {
 422         int i;
 423
 424         put_header(s, USER_START_CODE);
 425         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 426             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 427         }
 428     }
 429
 430     s->mb_y=0;
 431     ff_mpeg1_encode_slice_header(s);
 432 }
 433
 434 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 435                                 int has_mv, int field_motion)
 436 {
 437     put_bits(&s->pb, n, bits);
 438     if (!s->frame_pred_frame_dct) {
 439         if (has_mv)
 440             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 441         put_bits(&s->pb, 1, s->interlaced_dct);
 442     }
 443 }
 444
 445 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 446                                                    DCTELEM block[6][64],
 447                                                    int motion_x, int motion_y,
 448                                                    int mb_block_count)
 449 {
 450     int i, cbp;
 451     const int mb_x = s->mb_x;
 452     const int mb_y = s->mb_y;
 453     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 454
 455     /* compute cbp */
 456     cbp = 0;
 457     for(i=0;i<mb_block_count;i++) {
 458         if (s->block_last_index[i] >= 0)
 459             cbp |= 1 << (mb_block_count - 1 - i);
 460     }
 461
 462     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 463         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
 464         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 465         (s->pict_type == AV_PICTURE_TYPE_B && 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) |
 466         ((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))) {
 467         s->mb_skip_run++;
 468         s->qscale -= s->dquant;
 469         s->skip_count++;
 470         s->misc_bits++;
 471         s->last_bits++;
 472         if(s->pict_type == AV_PICTURE_TYPE_P){
 473             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 474             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 475         }
 476     } else {
 477         if(first_mb){
 478             assert(s->mb_skip_run == 0);
 479             encode_mb_skip_run(s, s->mb_x);
 480         }else{
 481             encode_mb_skip_run(s, s->mb_skip_run);
 482         }
 483
 484         if (s->pict_type == AV_PICTURE_TYPE_I) {
 485             if(s->dquant && cbp){
 486                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 487                 put_qscale(s);
 488             }else{
 489                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 490                 s->qscale -= s->dquant;
 491             }
 492             s->misc_bits+= get_bits_diff(s);
 493             s->i_count++;
 494         } else if (s->mb_intra) {
 495             if(s->dquant && cbp){
 496                 put_mb_modes(s, 6, 0x01, 0, 0);
 497                 put_qscale(s);
 498             }else{
 499                 put_mb_modes(s, 5, 0x03, 0, 0);
 500                 s->qscale -= s->dquant;
 501             }
 502             s->misc_bits+= get_bits_diff(s);
 503             s->i_count++;
 504             memset(s->last_mv, 0, sizeof(s->last_mv));
 505         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 506             if(s->mv_type == MV_TYPE_16X16){
 507                 if (cbp != 0) {
 508                     if ((motion_x|motion_y) == 0) {
 509                         if(s->dquant){
 510                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 511                             put_qscale(s);
 512                         }else{
 513                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 514                         }
 515                         s->misc_bits+= get_bits_diff(s);
 516                     } else {
 517                         if(s->dquant){
 518                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 519                             put_qscale(s);
 520                         }else{
 521                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 522                         }
 523                         s->misc_bits+= get_bits_diff(s);
 524                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 525                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 526                         s->mv_bits+= get_bits_diff(s);
 527                     }
 528                 } else {
 529                     put_bits(&s->pb, 3, 1); /* motion only */
 530                     if (!s->frame_pred_frame_dct)
 531                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 532                     s->misc_bits+= get_bits_diff(s);
 533                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 534                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 535                     s->qscale -= s->dquant;
 536                     s->mv_bits+= get_bits_diff(s);
 537                 }
 538                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 539                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 540             }else{
 541                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 542
 543                 if (cbp) {
 544                     if(s->dquant){
 545                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 546                         put_qscale(s);
 547                     }else{
 548                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 549                     }
 550                 } else {
 551                     put_bits(&s->pb, 3, 1); /* motion only */
 552                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 553                     s->qscale -= s->dquant;
 554                 }
 555                 s->misc_bits+= get_bits_diff(s);
 556                 for(i=0; i<2; i++){
 557                     put_bits(&s->pb, 1, s->field_select[0][i]);
 558                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 559                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 560                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 561                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 562                 }
 563                 s->mv_bits+= get_bits_diff(s);
 564             }
 565             if(cbp) {
 566                 if (s->chroma_y_shift) {
 567                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 568                 } else {
 569                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 570                     put_sbits(&s->pb, 2, cbp);
 571                 }
 572             }
 573             s->f_count++;
 574         } else{
 575             if(s->mv_type == MV_TYPE_16X16){
 576                 if (cbp){    // With coded bloc pattern
 577                     if (s->dquant) {
 578                         if(s->mv_dir == MV_DIR_FORWARD)
 579                             put_mb_modes(s, 6, 3, 1, 0);
 580                         else
 581                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
 582                         put_qscale(s);
 583                     } else {
 584                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
 585                     }
 586                 }else{    // No coded bloc pattern
 587                     put_bits(&s->pb, 5-s->mv_dir, 2);
 588                     if (!s->frame_pred_frame_dct)
 589                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 590                     s->qscale -= s->dquant;
 591                 }
 592                 s->misc_bits += get_bits_diff(s);
 593                 if (s->mv_dir&MV_DIR_FORWARD){
 594                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 595                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 596                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 597                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 598                     s->f_count++;
 599                 }
 600                 if (s->mv_dir&MV_DIR_BACKWARD){
 601                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 602                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 603                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 604                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 605                     s->b_count++;
 606                 }
 607             }else{
 608                 assert(s->mv_type == MV_TYPE_FIELD);
 609                 assert(!s->frame_pred_frame_dct);
 610                 if (cbp){    // With coded bloc pattern
 611                     if (s->dquant) {
 612                         if(s->mv_dir == MV_DIR_FORWARD)
 613                             put_mb_modes(s, 6, 3, 1, 1);
 614                         else
 615                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
 616                         put_qscale(s);
 617                     } else {
 618                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
 619                     }
 620                 }else{    // No coded bloc pattern
 621                     put_bits(&s->pb, 5-s->mv_dir, 2);
 622                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 623                     s->qscale -= s->dquant;
 624                 }
 625                 s->misc_bits += get_bits_diff(s);
 626                 if (s->mv_dir&MV_DIR_FORWARD){
 627                     for(i=0; i<2; i++){
 628                         put_bits(&s->pb, 1, s->field_select[0][i]);
 629                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 630                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 631                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 632                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 633                     }
 634                     s->f_count++;
 635                 }
 636                 if (s->mv_dir&MV_DIR_BACKWARD){
 637                     for(i=0; i<2; i++){
 638                         put_bits(&s->pb, 1, s->field_select[1][i]);
 639                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 640                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 641                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 642                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 643                     }
 644                     s->b_count++;
 645                 }
 646             }
 647             s->mv_bits += get_bits_diff(s);
 648             if(cbp) {
 649                 if (s->chroma_y_shift) {
 650                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 651                 } else {
 652                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 653                     put_sbits(&s->pb, 2, cbp);
 654                 }
 655             }
 656         }
 657         for(i=0;i<mb_block_count;i++) {
 658             if (cbp & (1 << (mb_block_count - 1 - i))) {
 659                 mpeg1_encode_block(s, block[i], i);
 660             }
 661         }
 662         s->mb_skip_run = 0;
 663         if(s->mb_intra)
 664             s->i_tex_bits+= get_bits_diff(s);
 665         else
 666             s->p_tex_bits+= get_bits_diff(s);
 667     }
 668 }
 669
 670 void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
 671 {
 672     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 673     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 674 }
 675
 676 // RAL: Parameter added: f_or_b_code
 677 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 678 {
 679     if (val == 0) {
 680         /* zero vector */
 681         put_bits(&s->pb,
 682                  ff_mpeg12_mbMotionVectorTable[0][1],
 683                  ff_mpeg12_mbMotionVectorTable[0][0]);
 684     } else {
 685         int code, sign, bits;
 686         int bit_size = f_or_b_code - 1;
 687         int range = 1 << bit_size;
 688         /* modulo encoding */
 689         val = sign_extend(val, 5 + bit_size);
 690
 691         if (val >= 0) {
 692             val--;
 693             code = (val >> bit_size) + 1;
 694             bits = val & (range - 1);
 695             sign = 0;
 696         } else {
 697             val = -val;
 698             val--;
 699             code = (val >> bit_size) + 1;
 700             bits = val & (range - 1);
 701             sign = 1;
 702         }
 703
 704         assert(code > 0 && code <= 16);
 705
 706         put_bits(&s->pb,
 707                  ff_mpeg12_mbMotionVectorTable[code][1],
 708                  ff_mpeg12_mbMotionVectorTable[code][0]);
 709
 710         put_bits(&s->pb, 1, sign);
 711         if (bit_size > 0) {
 712             put_bits(&s->pb, bit_size, bits);
 713         }
 714     }
 715 }
 716
 717 void ff_mpeg1_encode_init(MpegEncContext *s)
 718 {
 719     static int done=0;
 720
 721     ff_mpeg12_common_init(s);
 722
 723     if(!done){
 724         int f_code;
 725         int mv;
 726         int i;
 727
 728         done=1;
 729         init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 730         init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 731
 732         for(i=0; i<64; i++)
 733         {
 734                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
 735                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
 736         }
 737
 738         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 739         if(s->intra_vlc_format)
 740             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 741
 742         /* build unified dc encoding tables */
 743         for(i=-255; i<256; i++)
 744         {
 745                 int adiff, index;
 746                 int bits, code;
 747                 int diff=i;
 748
 749                 adiff = FFABS(diff);
 750                 if(diff<0) diff--;
 751                 index = av_log2(2*adiff);
 752
 753                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
 754                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 755                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 756
 757                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 758                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 759                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 760         }
 761
 762         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 763             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 764                 int len;
 765
 766                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
 767                 else{
 768                     int val, bit_size, code;
 769
 770                     bit_size = f_code - 1;
 771
 772                     val=mv;
 773                     if (val < 0)
 774                         val = -val;
 775                     val--;
 776                     code = (val >> bit_size) + 1;
 777                     if(code<17){
 778                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
 779                     }else{
 780                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
 781                     }
 782                 }
 783
 784                 mv_penalty[f_code][mv+MAX_MV]= len;
 785             }
 786         }
 787
 788
 789         for(f_code=MAX_FCODE; f_code>0; f_code--){
 790             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 791                 fcode_tab[mv+MAX_MV]= f_code;
 792             }
 793         }
 794     }
 795     s->me.mv_penalty= mv_penalty;
 796     s->fcode_tab= fcode_tab;
 797     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 798         s->min_qcoeff=-255;
 799         s->max_qcoeff= 255;
 800     }else{
 801         s->min_qcoeff=-2047;
 802         s->max_qcoeff= 2047;
 803     }
 804     if (s->intra_vlc_format) {
 805         s->intra_ac_vlc_length=
 806         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 807     } else {
 808         s->intra_ac_vlc_length=
 809         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 810     }
 811     s->inter_ac_vlc_length=
 812     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 813 }
 814
 815 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 816 {
 817   if(((unsigned) (diff+255)) >= 511){
 818         int index;
 819
 820         if(diff<0){
 821             index= av_log2_16bit(-2*diff);
 822             diff--;
 823         }else{
 824             index= av_log2_16bit(2*diff);
 825         }
 826         if (component == 0) {
 827             put_bits(
 828                 &s->pb,
 829                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
 830                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 831         }else{
 832             put_bits(
 833                 &s->pb,
 834                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 835                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 836         }
 837   }else{
 838     if (component == 0) {
 839         put_bits(
 840             &s->pb,
 841             mpeg1_lum_dc_uni[diff+255]&0xFF,
 842             mpeg1_lum_dc_uni[diff+255]>>8);
 843     } else {
 844         put_bits(
 845             &s->pb,
 846             mpeg1_chr_dc_uni[diff+255]&0xFF,
 847             mpeg1_chr_dc_uni[diff+255]>>8);
 848     }
 849   }
 850 }
 851
 852 static void mpeg1_encode_block(MpegEncContext *s,
 853                                DCTELEM *block,
 854                                int n)
 855 {
 856     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 857     int code, component;
 858     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 859
 860     last_index = s->block_last_index[n];
 861
 862     /* DC coef */
 863     if (s->mb_intra) {
 864         component = (n <= 3 ? 0 : (n&1) + 1);
 865         dc = block[0]; /* overflow is impossible */
 866         diff = dc - s->last_dc[component];
 867         encode_dc(s, diff, component);
 868         s->last_dc[component] = dc;
 869         i = 1;
 870         if (s->intra_vlc_format)
 871             table_vlc = ff_rl_mpeg2.table_vlc;
 872     } else {
 873         /* encode the first coefficient : needs to be done here because
 874            it is handled slightly differently */
 875         level = block[0];
 876         if (abs(level) == 1) {
 877                 code = ((uint32_t)level >> 31); /* the sign bit */
 878                 put_bits(&s->pb, 2, code | 0x02);
 879                 i = 1;
 880         } else {
 881             i = 0;
 882             last_non_zero = -1;
 883             goto next_coef;
 884         }
 885     }
 886
 887     /* now quantify & encode AC coefs */
 888     last_non_zero = i - 1;
 889
 890     for(;i<=last_index;i++) {
 891         j = s->intra_scantable.permutated[i];
 892         level = block[j];
 893     next_coef:
 894         /* encode using VLC */
 895         if (level != 0) {
 896             run = i - last_non_zero - 1;
 897
 898             alevel= level;
 899             MASK_ABS(sign, alevel)
 900             sign&=1;
 901
 902             if (alevel <= mpeg1_max_level[0][run]){
 903                 code= mpeg1_index_run[0][run] + alevel - 1;
 904                 /* store the vlc & sign at once */
 905                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
 906             } else {
 907                 /* escape seems to be pretty rare <5% so I do not optimize it */
 908                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 909                 /* escape: only clip in this case */
 910                 put_bits(&s->pb, 6, run);
 911                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 912                     if (alevel < 128) {
 913                         put_sbits(&s->pb, 8, level);
 914                     } else {
 915                         if (level < 0) {
 916                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 917                         } else {
 918                             put_sbits(&s->pb, 16, level);
 919                         }
 920                     }
 921                 }else{
 922                     put_sbits(&s->pb, 12, level);
 923                 }
 924             }
 925             last_non_zero = i;
 926         }
 927     }
 928     /* end of block */
 929     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 930 }
 931
 932 #define OFFSET(x) offsetof(MpegEncContext, x)
 933 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 934 #define COMMON_OPTS\
 935         {TIMECODE_OPT(MpegEncContext,\
 936          AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)},\
 937     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },\
 938     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE}, \
 939     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 940
 941 static const AVOption mpeg1_options[] = {
 942     COMMON_OPTS
 943     { NULL },
 944 };
 945
 946 static const AVOption mpeg2_options[] = {
 947     COMMON_OPTS
 948     { "non_linear_quant",    "Use nonlinear quantizer.",          OFFSET(q_scale_type),         AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 949     { "alternate_scan",      "Enable alternate scantable.",       OFFSET(alternate_scan),       AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 950     { NULL },
 951 };
 952
 953 #define mpeg12_class(x)\
 954 static const AVClass mpeg## x ##_class = {\
 955     .class_name   = "mpeg" #x "video encoder",\
 956     .item_name    = av_default_item_name,\
 957     .option       = mpeg## x ##_options,\
 958     .version      = LIBAVUTIL_VERSION_INT,\
 959 };
 960
 961 mpeg12_class(1)
 962 mpeg12_class(2)
 963
 964 AVCodec ff_mpeg1video_encoder = {
 965     .name           = "mpeg1video",
 966     .type           = AVMEDIA_TYPE_VIDEO,
 967     .id             = CODEC_ID_MPEG1VIDEO,
 968     .priv_data_size = sizeof(MpegEncContext),
 969     .init           = encode_init,
 970     .encode         = MPV_encode_picture,
 971     .close          = MPV_encode_end,
 972     .supported_framerates= avpriv_frame_rate_tab+1,
 973     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
 974     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 975     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
 976     .priv_class     = &mpeg1_class,
 977 };
 978
 979 AVCodec ff_mpeg2video_encoder = {
 980     .name           = "mpeg2video",
 981     .type           = AVMEDIA_TYPE_VIDEO,
 982     .id             = CODEC_ID_MPEG2VIDEO,
 983     .priv_data_size = sizeof(MpegEncContext),
 984     .init           = encode_init,
 985     .encode         = MPV_encode_picture,
 986     .close          = MPV_encode_end,
 987     .supported_framerates= avpriv_frame_rate_tab+1,
 988     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE},
 989     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 990     .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
 991     .priv_class     = &mpeg2_class,
 992 };