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 "libavutil/log.h"
  37 #include "libavutil/opt.h"
  38 #include "libavutil/avassert.h"
  39 #include "libavutil/timecode.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(ff_MPV_encode_init(avctx) < 0)
 136         return -1;
 137
 138     if(find_frame_rate_index(s) < 0){
 139         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
 140             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
 141             return -1;
 142         }else{
 143             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);
 144         }
 145     }
 146
 147     if(avctx->profile == FF_PROFILE_UNKNOWN){
 148         if(avctx->level != FF_LEVEL_UNKNOWN){
 149             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 150             return -1;
 151         }
 152         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
 153     }
 154
 155     if(avctx->level == FF_LEVEL_UNKNOWN){
 156         if(avctx->profile == 0){ /* 4:2:2 */
 157             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
 158             else                                            avctx->level = 2; /* High */
 159         }else{
 160             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
 161                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 162                 return -1;
 163             }
 164             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
 165             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
 166             else                                            avctx->level = 4; /* High */
 167         }
 168     }
 169
 170     s->drop_frame_timecode = s->drop_frame_timecode || !!(avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE);
 171     if (s->drop_frame_timecode)
 172         s->tc.flags |= AV_TIMECODE_FLAG_DROPFRAME;
 173     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 174         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 175         return -1;
 176     }
 177
 178     if (s->tc_opt_str) {
 179         AVRational rate = avpriv_frame_rate_tab[s->frame_rate_index];
 180         int ret = av_timecode_init_from_string(&s->tc, rate, s->tc_opt_str, s);
 181         if (ret < 0)
 182             return ret;
 183         s->drop_frame_timecode = !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME);
 184         s->avctx->timecode_frame_start = s->tc.start;
 185     } else {
 186         s->avctx->timecode_frame_start = 0; // default is -1
 187     }
 188     return 0;
 189 }
 190
 191 static void put_header(MpegEncContext *s, int header)
 192 {
 193     avpriv_align_put_bits(&s->pb);
 194     put_bits(&s->pb, 16, header>>16);
 195     put_sbits(&s->pb, 16, header);
 196 }
 197
 198 /* put sequence header if needed */
 199 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 200 {
 201         unsigned int vbv_buffer_size;
 202         unsigned int fps, v;
 203         int i;
 204         uint64_t time_code;
 205         float best_aspect_error= 1E10;
 206         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 207         int constraint_parameter_flag;
 208
 209         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 210
 211         if (s->current_picture.f.key_frame) {
 212             AVRational framerate= avpriv_frame_rate_tab[s->frame_rate_index];
 213
 214             /* mpeg1 header repeated every gop */
 215             put_header(s, SEQ_START_CODE);
 216
 217             put_sbits(&s->pb, 12, s->width );
 218             put_sbits(&s->pb, 12, s->height);
 219
 220             for(i=1; i<15; i++){
 221                 float error= aspect_ratio;
 222                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
 223                     error-= 1.0/ff_mpeg1_aspect[i];
 224                 else
 225                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
 226
 227                 error= FFABS(error);
 228
 229                 if(error < best_aspect_error){
 230                     best_aspect_error= error;
 231                     s->aspect_ratio_info= i;
 232                 }
 233             }
 234
 235             put_bits(&s->pb, 4, s->aspect_ratio_info);
 236             put_bits(&s->pb, 4, s->frame_rate_index);
 237
 238             if(s->avctx->rc_max_rate){
 239                 v = (s->avctx->rc_max_rate + 399) / 400;
 240                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
 241                     v = 0x3ffff;
 242             }else{
 243                 v= 0x3FFFF;
 244             }
 245
 246             if(s->avctx->rc_buffer_size)
 247                 vbv_buffer_size = s->avctx->rc_buffer_size;
 248             else
 249                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 250                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 251             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 252
 253             put_sbits(&s->pb, 18, v);
 254             put_bits(&s->pb, 1, 1); /* marker */
 255             put_sbits(&s->pb, 10, vbv_buffer_size);
 256
 257             constraint_parameter_flag=
 258                 s->width <= 768 && s->height <= 576 &&
 259                 s->mb_width * s->mb_height <= 396 &&
 260                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 261                 framerate.num <= framerate.den*30 &&
 262                 s->avctx->me_range && s->avctx->me_range < 128 &&
 263                 vbv_buffer_size <= 20 &&
 264                 v <= 1856000/400 &&
 265                 s->codec_id == CODEC_ID_MPEG1VIDEO;
 266
 267             put_bits(&s->pb, 1, constraint_parameter_flag);
 268
 269             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 270             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 271
 272             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 273                 put_header(s, EXT_START_CODE);
 274                 put_bits(&s->pb, 4, 1); //seq ext
 275
 276                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 277
 278                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 279                 put_bits(&s->pb, 4, s->avctx->level); //level
 280
 281                 put_bits(&s->pb, 1, s->progressive_sequence);
 282                 put_bits(&s->pb, 2, s->chroma_format);
 283                 put_bits(&s->pb, 2, s->width >>12);
 284                 put_bits(&s->pb, 2, s->height>>12);
 285                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 286                 put_bits(&s->pb, 1, 1); //marker
 287                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 288                 put_bits(&s->pb, 1, s->low_delay);
 289                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
 290                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
 291             }
 292
 293             put_header(s, GOP_START_CODE);
 294             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
 295             /* time code : we must convert from the real frame rate to a
 296                fake mpeg frame rate in case of low frame rate */
 297             fps = (framerate.num + framerate.den/2)/ framerate.den;
 298             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
 299
 300             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 301             av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));
 302             if (s->drop_frame_timecode)
 303                 time_code = av_timecode_adjust_ntsc_framenum(time_code);
 304             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 305             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 306             put_bits(&s->pb, 1, 1);
 307             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 308             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 309             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 310             put_bits(&s->pb, 1, 0); /* broken link */
 311         }
 312 }
 313
 314 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 315     while (run >= 33) {
 316         put_bits(&s->pb, 11, 0x008);
 317         run -= 33;
 318     }
 319     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 320              ff_mpeg12_mbAddrIncrTable[run][0]);
 321 }
 322
 323 static av_always_inline void put_qscale(MpegEncContext *s)
 324 {
 325     if(s->q_scale_type){
 326         assert(s->qscale>=1 && s->qscale <=12);
 327         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 328     }else{
 329         put_bits(&s->pb, 5, s->qscale);
 330     }
 331 }
 332
 333 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 334     if (s->height > 2800) {
 335         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 336         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
 337     } else {
 338         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 339     }
 340     put_qscale(s);
 341     put_bits(&s->pb, 1, 0); /* slice extra information */
 342 }
 343
 344 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 345 {
 346     mpeg1_encode_sequence_header(s);
 347
 348     /* mpeg1 picture header */
 349     put_header(s, PICTURE_START_CODE);
 350     /* temporal reference */
 351
 352     // RAL: s->picture_number instead of s->fake_picture_number
 353     put_bits(&s->pb, 10, (s->picture_number -
 354                           s->gop_picture_number) & 0x3ff);
 355     put_bits(&s->pb, 3, s->pict_type);
 356
 357     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 358     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 359
 360     // RAL: Forward f_code also needed for B frames
 361     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 362         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 363         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 364             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 365         else
 366             put_bits(&s->pb, 3, 7); /* forward_f_code */
 367     }
 368
 369     // RAL: Backward f_code necessary for B frames
 370     if (s->pict_type == AV_PICTURE_TYPE_B) {
 371         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 372         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 373             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 374         else
 375             put_bits(&s->pb, 3, 7); /* backward_f_code */
 376     }
 377
 378     put_bits(&s->pb, 1, 0); /* extra bit picture */
 379
 380     s->frame_pred_frame_dct = 1;
 381     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 382         put_header(s, EXT_START_CODE);
 383         put_bits(&s->pb, 4, 8); //pic ext
 384         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 385             put_bits(&s->pb, 4, s->f_code);
 386             put_bits(&s->pb, 4, s->f_code);
 387         }else{
 388             put_bits(&s->pb, 8, 255);
 389         }
 390         if (s->pict_type == AV_PICTURE_TYPE_B) {
 391             put_bits(&s->pb, 4, s->b_code);
 392             put_bits(&s->pb, 4, s->b_code);
 393         }else{
 394             put_bits(&s->pb, 8, 255);
 395         }
 396         put_bits(&s->pb, 2, s->intra_dc_precision);
 397
 398         assert(s->picture_structure == PICT_FRAME);
 399         put_bits(&s->pb, 2, s->picture_structure);
 400         if (s->progressive_sequence) {
 401             put_bits(&s->pb, 1, 0); /* no repeat */
 402         } else {
 403             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 404         }
 405         /* XXX: optimize the generation of this flag with entropy
 406            measures */
 407         s->frame_pred_frame_dct = s->progressive_sequence;
 408
 409         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 410         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 411         put_bits(&s->pb, 1, s->q_scale_type);
 412         put_bits(&s->pb, 1, s->intra_vlc_format);
 413         put_bits(&s->pb, 1, s->alternate_scan);
 414         put_bits(&s->pb, 1, s->repeat_first_field);
 415         s->progressive_frame = s->progressive_sequence;
 416         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 417         put_bits(&s->pb, 1, s->progressive_frame);
 418         put_bits(&s->pb, 1, 0); //composite_display_flag
 419     }
 420     if (s->scan_offset) {
 421         int i;
 422
 423         put_header(s, USER_START_CODE);
 424         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 425             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 426         }
 427     }
 428
 429     s->mb_y=0;
 430     ff_mpeg1_encode_slice_header(s);
 431 }
 432
 433 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 434                                 int has_mv, int field_motion)
 435 {
 436     put_bits(&s->pb, n, bits);
 437     if (!s->frame_pred_frame_dct) {
 438         if (has_mv)
 439             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 440         put_bits(&s->pb, 1, s->interlaced_dct);
 441     }
 442 }
 443
 444 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 445                                                    DCTELEM block[6][64],
 446                                                    int motion_x, int motion_y,
 447                                                    int mb_block_count)
 448 {
 449     int i, cbp;
 450     const int mb_x = s->mb_x;
 451     const int mb_y = s->mb_y;
 452     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 453
 454     /* compute cbp */
 455     cbp = 0;
 456     for(i=0;i<mb_block_count;i++) {
 457         if (s->block_last_index[i] >= 0)
 458             cbp |= 1 << (mb_block_count - 1 - i);
 459     }
 460
 461     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 462         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
 463         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 464         (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) |
 465         ((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))) {
 466         s->mb_skip_run++;
 467         s->qscale -= s->dquant;
 468         s->skip_count++;
 469         s->misc_bits++;
 470         s->last_bits++;
 471         if(s->pict_type == AV_PICTURE_TYPE_P){
 472             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 473             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 474         }
 475     } else {
 476         if(first_mb){
 477             assert(s->mb_skip_run == 0);
 478             encode_mb_skip_run(s, s->mb_x);
 479         }else{
 480             encode_mb_skip_run(s, s->mb_skip_run);
 481         }
 482
 483         if (s->pict_type == AV_PICTURE_TYPE_I) {
 484             if(s->dquant && cbp){
 485                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 486                 put_qscale(s);
 487             }else{
 488                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 489                 s->qscale -= s->dquant;
 490             }
 491             s->misc_bits+= get_bits_diff(s);
 492             s->i_count++;
 493         } else if (s->mb_intra) {
 494             if(s->dquant && cbp){
 495                 put_mb_modes(s, 6, 0x01, 0, 0);
 496                 put_qscale(s);
 497             }else{
 498                 put_mb_modes(s, 5, 0x03, 0, 0);
 499                 s->qscale -= s->dquant;
 500             }
 501             s->misc_bits+= get_bits_diff(s);
 502             s->i_count++;
 503             memset(s->last_mv, 0, sizeof(s->last_mv));
 504         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 505             if(s->mv_type == MV_TYPE_16X16){
 506                 if (cbp != 0) {
 507                     if ((motion_x|motion_y) == 0) {
 508                         if(s->dquant){
 509                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 510                             put_qscale(s);
 511                         }else{
 512                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 513                         }
 514                         s->misc_bits+= get_bits_diff(s);
 515                     } else {
 516                         if(s->dquant){
 517                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 518                             put_qscale(s);
 519                         }else{
 520                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 521                         }
 522                         s->misc_bits+= get_bits_diff(s);
 523                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 524                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 525                         s->mv_bits+= get_bits_diff(s);
 526                     }
 527                 } else {
 528                     put_bits(&s->pb, 3, 1); /* motion only */
 529                     if (!s->frame_pred_frame_dct)
 530                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 531                     s->misc_bits+= get_bits_diff(s);
 532                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 533                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 534                     s->qscale -= s->dquant;
 535                     s->mv_bits+= get_bits_diff(s);
 536                 }
 537                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 538                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 539             }else{
 540                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 541
 542                 if (cbp) {
 543                     if(s->dquant){
 544                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 545                         put_qscale(s);
 546                     }else{
 547                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 548                     }
 549                 } else {
 550                     put_bits(&s->pb, 3, 1); /* motion only */
 551                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 552                     s->qscale -= s->dquant;
 553                 }
 554                 s->misc_bits+= get_bits_diff(s);
 555                 for(i=0; i<2; i++){
 556                     put_bits(&s->pb, 1, s->field_select[0][i]);
 557                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 558                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 559                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 560                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 561                 }
 562                 s->mv_bits+= get_bits_diff(s);
 563             }
 564             if(cbp) {
 565                 if (s->chroma_y_shift) {
 566                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 567                 } else {
 568                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 569                     put_sbits(&s->pb, 2, cbp);
 570                 }
 571             }
 572             s->f_count++;
 573         } else{
 574             if(s->mv_type == MV_TYPE_16X16){
 575                 if (cbp){    // With coded bloc pattern
 576                     if (s->dquant) {
 577                         if(s->mv_dir == MV_DIR_FORWARD)
 578                             put_mb_modes(s, 6, 3, 1, 0);
 579                         else
 580                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
 581                         put_qscale(s);
 582                     } else {
 583                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
 584                     }
 585                 }else{    // No coded bloc pattern
 586                     put_bits(&s->pb, 5-s->mv_dir, 2);
 587                     if (!s->frame_pred_frame_dct)
 588                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 589                     s->qscale -= s->dquant;
 590                 }
 591                 s->misc_bits += get_bits_diff(s);
 592                 if (s->mv_dir&MV_DIR_FORWARD){
 593                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 594                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 595                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 596                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 597                     s->f_count++;
 598                 }
 599                 if (s->mv_dir&MV_DIR_BACKWARD){
 600                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 601                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 602                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 603                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 604                     s->b_count++;
 605                 }
 606             }else{
 607                 assert(s->mv_type == MV_TYPE_FIELD);
 608                 assert(!s->frame_pred_frame_dct);
 609                 if (cbp){    // With coded bloc pattern
 610                     if (s->dquant) {
 611                         if(s->mv_dir == MV_DIR_FORWARD)
 612                             put_mb_modes(s, 6, 3, 1, 1);
 613                         else
 614                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
 615                         put_qscale(s);
 616                     } else {
 617                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
 618                     }
 619                 }else{    // No coded bloc pattern
 620                     put_bits(&s->pb, 5-s->mv_dir, 2);
 621                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 622                     s->qscale -= s->dquant;
 623                 }
 624                 s->misc_bits += get_bits_diff(s);
 625                 if (s->mv_dir&MV_DIR_FORWARD){
 626                     for(i=0; i<2; i++){
 627                         put_bits(&s->pb, 1, s->field_select[0][i]);
 628                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 629                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 630                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 631                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 632                     }
 633                     s->f_count++;
 634                 }
 635                 if (s->mv_dir&MV_DIR_BACKWARD){
 636                     for(i=0; i<2; i++){
 637                         put_bits(&s->pb, 1, s->field_select[1][i]);
 638                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 639                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 640                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 641                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 642                     }
 643                     s->b_count++;
 644                 }
 645             }
 646             s->mv_bits += get_bits_diff(s);
 647             if(cbp) {
 648                 if (s->chroma_y_shift) {
 649                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 650                 } else {
 651                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 652                     put_sbits(&s->pb, 2, cbp);
 653                 }
 654             }
 655         }
 656         for(i=0;i<mb_block_count;i++) {
 657             if (cbp & (1 << (mb_block_count - 1 - i))) {
 658                 mpeg1_encode_block(s, block[i], i);
 659             }
 660         }
 661         s->mb_skip_run = 0;
 662         if(s->mb_intra)
 663             s->i_tex_bits+= get_bits_diff(s);
 664         else
 665             s->p_tex_bits+= get_bits_diff(s);
 666     }
 667 }
 668
 669 void ff_mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
 670 {
 671     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 672     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 673 }
 674
 675 // RAL: Parameter added: f_or_b_code
 676 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 677 {
 678     if (val == 0) {
 679         /* zero vector */
 680         put_bits(&s->pb,
 681                  ff_mpeg12_mbMotionVectorTable[0][1],
 682                  ff_mpeg12_mbMotionVectorTable[0][0]);
 683     } else {
 684         int code, sign, bits;
 685         int bit_size = f_or_b_code - 1;
 686         int range = 1 << bit_size;
 687         /* modulo encoding */
 688         val = sign_extend(val, 5 + bit_size);
 689
 690         if (val >= 0) {
 691             val--;
 692             code = (val >> bit_size) + 1;
 693             bits = val & (range - 1);
 694             sign = 0;
 695         } else {
 696             val = -val;
 697             val--;
 698             code = (val >> bit_size) + 1;
 699             bits = val & (range - 1);
 700             sign = 1;
 701         }
 702
 703         assert(code > 0 && code <= 16);
 704
 705         put_bits(&s->pb,
 706                  ff_mpeg12_mbMotionVectorTable[code][1],
 707                  ff_mpeg12_mbMotionVectorTable[code][0]);
 708
 709         put_bits(&s->pb, 1, sign);
 710         if (bit_size > 0) {
 711             put_bits(&s->pb, bit_size, bits);
 712         }
 713     }
 714 }
 715
 716 void ff_mpeg1_encode_init(MpegEncContext *s)
 717 {
 718     static int done=0;
 719
 720     ff_mpeg12_common_init(s);
 721
 722     if(!done){
 723         int f_code;
 724         int mv;
 725         int i;
 726
 727         done=1;
 728         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 729         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 730
 731         for(i=0; i<64; i++)
 732         {
 733                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
 734                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
 735         }
 736
 737         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 738         if(s->intra_vlc_format)
 739             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 740
 741         /* build unified dc encoding tables */
 742         for(i=-255; i<256; i++)
 743         {
 744                 int adiff, index;
 745                 int bits, code;
 746                 int diff=i;
 747
 748                 adiff = FFABS(diff);
 749                 if(diff<0) diff--;
 750                 index = av_log2(2*adiff);
 751
 752                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
 753                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 754                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 755
 756                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 757                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 758                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 759         }
 760
 761         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 762             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 763                 int len;
 764
 765                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
 766                 else{
 767                     int val, bit_size, code;
 768
 769                     bit_size = f_code - 1;
 770
 771                     val=mv;
 772                     if (val < 0)
 773                         val = -val;
 774                     val--;
 775                     code = (val >> bit_size) + 1;
 776                     if(code<17){
 777                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
 778                     }else{
 779                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
 780                     }
 781                 }
 782
 783                 mv_penalty[f_code][mv+MAX_MV]= len;
 784             }
 785         }
 786
 787
 788         for(f_code=MAX_FCODE; f_code>0; f_code--){
 789             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 790                 fcode_tab[mv+MAX_MV]= f_code;
 791             }
 792         }
 793     }
 794     s->me.mv_penalty= mv_penalty;
 795     s->fcode_tab= fcode_tab;
 796     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 797         s->min_qcoeff=-255;
 798         s->max_qcoeff= 255;
 799     }else{
 800         s->min_qcoeff=-2047;
 801         s->max_qcoeff= 2047;
 802     }
 803     if (s->intra_vlc_format) {
 804         s->intra_ac_vlc_length=
 805         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 806     } else {
 807         s->intra_ac_vlc_length=
 808         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 809     }
 810     s->inter_ac_vlc_length=
 811     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 812 }
 813
 814 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 815 {
 816   if(((unsigned) (diff+255)) >= 511){
 817         int index;
 818
 819         if(diff<0){
 820             index= av_log2_16bit(-2*diff);
 821             diff--;
 822         }else{
 823             index= av_log2_16bit(2*diff);
 824         }
 825         if (component == 0) {
 826             put_bits(
 827                 &s->pb,
 828                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
 829                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 830         }else{
 831             put_bits(
 832                 &s->pb,
 833                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 834                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 835         }
 836   }else{
 837     if (component == 0) {
 838         put_bits(
 839             &s->pb,
 840             mpeg1_lum_dc_uni[diff+255]&0xFF,
 841             mpeg1_lum_dc_uni[diff+255]>>8);
 842     } else {
 843         put_bits(
 844             &s->pb,
 845             mpeg1_chr_dc_uni[diff+255]&0xFF,
 846             mpeg1_chr_dc_uni[diff+255]>>8);
 847     }
 848   }
 849 }
 850
 851 static void mpeg1_encode_block(MpegEncContext *s,
 852                                DCTELEM *block,
 853                                int n)
 854 {
 855     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 856     int code, component;
 857     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 858
 859     last_index = s->block_last_index[n];
 860
 861     /* DC coef */
 862     if (s->mb_intra) {
 863         component = (n <= 3 ? 0 : (n&1) + 1);
 864         dc = block[0]; /* overflow is impossible */
 865         diff = dc - s->last_dc[component];
 866         encode_dc(s, diff, component);
 867         s->last_dc[component] = dc;
 868         i = 1;
 869         if (s->intra_vlc_format)
 870             table_vlc = ff_rl_mpeg2.table_vlc;
 871     } else {
 872         /* encode the first coefficient : needs to be done here because
 873            it is handled slightly differently */
 874         level = block[0];
 875         if (abs(level) == 1) {
 876                 code = ((uint32_t)level >> 31); /* the sign bit */
 877                 put_bits(&s->pb, 2, code | 0x02);
 878                 i = 1;
 879         } else {
 880             i = 0;
 881             last_non_zero = -1;
 882             goto next_coef;
 883         }
 884     }
 885
 886     /* now quantify & encode AC coefs */
 887     last_non_zero = i - 1;
 888
 889     for(;i<=last_index;i++) {
 890         j = s->intra_scantable.permutated[i];
 891         level = block[j];
 892     next_coef:
 893         /* encode using VLC */
 894         if (level != 0) {
 895             run = i - last_non_zero - 1;
 896
 897             alevel= level;
 898             MASK_ABS(sign, alevel)
 899             sign&=1;
 900
 901             if (alevel <= mpeg1_max_level[0][run]){
 902                 code= mpeg1_index_run[0][run] + alevel - 1;
 903                 /* store the vlc & sign at once */
 904                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
 905             } else {
 906                 /* escape seems to be pretty rare <5% so I do not optimize it */
 907                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 908                 /* escape: only clip in this case */
 909                 put_bits(&s->pb, 6, run);
 910                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 911                     if (alevel < 128) {
 912                         put_sbits(&s->pb, 8, level);
 913                     } else {
 914                         if (level < 0) {
 915                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 916                         } else {
 917                             put_sbits(&s->pb, 16, level);
 918                         }
 919                     }
 920                 }else{
 921                     put_sbits(&s->pb, 12, level);
 922                 }
 923             }
 924             last_non_zero = i;
 925         }
 926     }
 927     /* end of block */
 928     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 929 }
 930
 931 #define OFFSET(x) offsetof(MpegEncContext, x)
 932 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 933 #define COMMON_OPTS\
 934         {AV_TIMECODE_OPTION(MpegEncContext, tc_opt_str, \
 935          AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)},\
 936     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },\
 937     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE}, \
 938     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 939
 940 static const AVOption mpeg1_options[] = {
 941     COMMON_OPTS
 942     FF_MPV_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     FF_MPV_COMMON_OPTS
 951     { NULL },
 952 };
 953
 954 #define mpeg12_class(x)\
 955 static const AVClass mpeg## x ##_class = {\
 956     .class_name   = "mpeg" #x "video encoder",\
 957     .item_name    = av_default_item_name,\
 958     .option       = mpeg## x ##_options,\
 959     .version      = LIBAVUTIL_VERSION_INT,\
 960 };
 961
 962 mpeg12_class(1)
 963 mpeg12_class(2)
 964
 965 AVCodec ff_mpeg1video_encoder = {
 966     .name           = "mpeg1video",
 967     .type           = AVMEDIA_TYPE_VIDEO,
 968     .id             = CODEC_ID_MPEG1VIDEO,
 969     .priv_data_size = sizeof(MpegEncContext),
 970     .init           = encode_init,
 971     .encode2        = ff_MPV_encode_picture,
 972     .close          = ff_MPV_encode_end,
 973     .supported_framerates= avpriv_frame_rate_tab+1,
 974     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
 975     .capabilities= CODEC_CAP_DELAY,
 976     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
 977     .priv_class     = &mpeg1_class,
 978 };
 979
 980 AVCodec ff_mpeg2video_encoder = {
 981     .name           = "mpeg2video",
 982     .type           = AVMEDIA_TYPE_VIDEO,
 983     .id             = CODEC_ID_MPEG2VIDEO,
 984     .priv_data_size = sizeof(MpegEncContext),
 985     .init           = encode_init,
 986     .encode2        = ff_MPV_encode_picture,
 987     .close          = ff_MPV_encode_end,
 988     .supported_framerates= avpriv_frame_rate_tab+1,
 989     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE},
 990     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 991     .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
 992     .priv_class     = &mpeg2_class,
 993 };