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 Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; 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 "mathops.h"
  30 #include "mpegvideo.h"
  31
  32 #include "mpeg12.h"
  33 #include "mpeg12data.h"
  34 #include "bytestream.h"
  35
  36 #include "libavutil/attributes.h"
  37 #include "libavutil/log.h"
  38 #include "libavutil/opt.h"
  39
  40 static const uint8_t inv_non_linear_qscale[13] = {
  41     0, 2, 4, 6, 8,
  42     9,10,11,12,13,14,15,16,
  43 };
  44
  45 static const uint8_t svcd_scan_offset_placeholder[14] = {
  46     0x10, 0x0E,
  47     0x00, 0x80, 0x81,
  48     0x00, 0x80, 0x81,
  49     0xff, 0xff, 0xff,
  50     0xff, 0xff, 0xff,
  51 };
  52
  53 static void mpeg1_encode_block(MpegEncContext *s,
  54                          int16_t *block,
  55                          int component);
  56 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
  57
  58 static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
  59 static uint8_t fcode_tab[MAX_MV*2+1];
  60
  61 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
  62 static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
  63
  64 /* simple include everything table for dc, first byte is bits number next 3 are code*/
  65 static uint32_t mpeg1_lum_dc_uni[512];
  66 static uint32_t mpeg1_chr_dc_uni[512];
  67
  68 static uint8_t mpeg1_index_run[2][64];
  69 static int8_t mpeg1_max_level[2][64];
  70
  71 static av_cold void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len)
  72 {
  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 / ff_mpeg12_frame_rate_tab[i].den * ff_mpeg12_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     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 171         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 172         return -1;
 173     }
 174
 175     return 0;
 176 }
 177
 178 static void put_header(MpegEncContext *s, int header)
 179 {
 180     avpriv_align_put_bits(&s->pb);
 181     put_bits(&s->pb, 16, header>>16);
 182     put_sbits(&s->pb, 16, header);
 183 }
 184
 185 /* put sequence header if needed */
 186 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 187 {
 188         unsigned int vbv_buffer_size;
 189         unsigned int fps, v;
 190         int i;
 191         uint64_t time_code;
 192         float best_aspect_error= 1E10;
 193         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 194         int constraint_parameter_flag;
 195
 196         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 197
 198         if (s->current_picture.f.key_frame) {
 199             AVRational framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 200
 201             /* mpeg1 header repeated every gop */
 202             put_header(s, SEQ_START_CODE);
 203
 204             put_sbits(&s->pb, 12, s->width );
 205             put_sbits(&s->pb, 12, s->height);
 206
 207             for(i=1; i<15; i++){
 208                 float error= aspect_ratio;
 209                 if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <=1)
 210                     error-= 1.0/ff_mpeg1_aspect[i];
 211                 else
 212                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
 213
 214                 error= FFABS(error);
 215
 216                 if(error < best_aspect_error){
 217                     best_aspect_error= error;
 218                     s->aspect_ratio_info= i;
 219                 }
 220             }
 221
 222             put_bits(&s->pb, 4, s->aspect_ratio_info);
 223             put_bits(&s->pb, 4, s->frame_rate_index);
 224
 225             if(s->avctx->rc_max_rate){
 226                 v = (s->avctx->rc_max_rate + 399) / 400;
 227                 if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 228                     v = 0x3ffff;
 229             }else{
 230                 v= 0x3FFFF;
 231             }
 232
 233             if(s->avctx->rc_buffer_size)
 234                 vbv_buffer_size = s->avctx->rc_buffer_size;
 235             else
 236                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 237                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 238             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 239
 240             put_sbits(&s->pb, 18, v);
 241             put_bits(&s->pb, 1, 1); /* marker */
 242             put_sbits(&s->pb, 10, vbv_buffer_size);
 243
 244             constraint_parameter_flag=
 245                 s->width <= 768 && s->height <= 576 &&
 246                 s->mb_width * s->mb_height <= 396 &&
 247                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 248                 framerate.num <= framerate.den*30 &&
 249                 s->avctx->me_range && s->avctx->me_range < 128 &&
 250                 vbv_buffer_size <= 20 &&
 251                 v <= 1856000/400 &&
 252                 s->codec_id == AV_CODEC_ID_MPEG1VIDEO;
 253
 254             put_bits(&s->pb, 1, constraint_parameter_flag);
 255
 256             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 257             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 258
 259             if(s->codec_id == AV_CODEC_ID_MPEG2VIDEO){
 260                 put_header(s, EXT_START_CODE);
 261                 put_bits(&s->pb, 4, 1); //seq ext
 262
 263                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 264
 265                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 266                 put_bits(&s->pb, 4, s->avctx->level); //level
 267
 268                 put_bits(&s->pb, 1, s->progressive_sequence);
 269                 put_bits(&s->pb, 2, s->chroma_format);
 270                 put_bits(&s->pb, 2, s->width >>12);
 271                 put_bits(&s->pb, 2, s->height>>12);
 272                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 273                 put_bits(&s->pb, 1, 1); //marker
 274                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 275                 put_bits(&s->pb, 1, s->low_delay);
 276                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
 277                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
 278             }
 279
 280             put_header(s, GOP_START_CODE);
 281             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
 282             /* time code : we must convert from the real frame rate to a
 283                fake mpeg frame rate in case of low frame rate */
 284             fps = (framerate.num + framerate.den/2)/ framerate.den;
 285             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
 286
 287             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 288             if (s->drop_frame_timecode) {
 289                 /* only works for NTSC 29.97 */
 290                 int d = time_code / 17982;
 291                 int m = time_code % 17982;
 292                 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
 293                 time_code += 18 * d + 2 * ((m - 2) / 1798);
 294             }
 295             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 296             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 297             put_bits(&s->pb, 1, 1);
 298             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 299             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 300             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 301             put_bits(&s->pb, 1, 0); /* broken link */
 302         }
 303 }
 304
 305 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 306     while (run >= 33) {
 307         put_bits(&s->pb, 11, 0x008);
 308         run -= 33;
 309     }
 310     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 311              ff_mpeg12_mbAddrIncrTable[run][0]);
 312 }
 313
 314 static av_always_inline void put_qscale(MpegEncContext *s)
 315 {
 316     if(s->q_scale_type){
 317         assert(s->qscale>=1 && s->qscale <=12);
 318         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 319     }else{
 320         put_bits(&s->pb, 5, s->qscale);
 321     }
 322 }
 323
 324 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 325     if (s->height > 2800) {
 326         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 327         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
 328     } else {
 329         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 330     }
 331     put_qscale(s);
 332     put_bits(&s->pb, 1, 0); /* slice extra information */
 333 }
 334
 335 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 336 {
 337     mpeg1_encode_sequence_header(s);
 338
 339     /* mpeg1 picture header */
 340     put_header(s, PICTURE_START_CODE);
 341     /* temporal reference */
 342
 343     // RAL: s->picture_number instead of s->fake_picture_number
 344     put_bits(&s->pb, 10, (s->picture_number -
 345                           s->gop_picture_number) & 0x3ff);
 346     put_bits(&s->pb, 3, s->pict_type);
 347
 348     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 349     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 350
 351     // RAL: Forward f_code also needed for B frames
 352     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 353         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 354         if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 355             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 356         else
 357             put_bits(&s->pb, 3, 7); /* forward_f_code */
 358     }
 359
 360     // RAL: Backward f_code necessary for B frames
 361     if (s->pict_type == AV_PICTURE_TYPE_B) {
 362         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 363         if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 364             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 365         else
 366             put_bits(&s->pb, 3, 7); /* backward_f_code */
 367     }
 368
 369     put_bits(&s->pb, 1, 0); /* extra bit picture */
 370
 371     s->frame_pred_frame_dct = 1;
 372     if(s->codec_id == AV_CODEC_ID_MPEG2VIDEO){
 373         put_header(s, EXT_START_CODE);
 374         put_bits(&s->pb, 4, 8); //pic ext
 375         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 376             put_bits(&s->pb, 4, s->f_code);
 377             put_bits(&s->pb, 4, s->f_code);
 378         }else{
 379             put_bits(&s->pb, 8, 255);
 380         }
 381         if (s->pict_type == AV_PICTURE_TYPE_B) {
 382             put_bits(&s->pb, 4, s->b_code);
 383             put_bits(&s->pb, 4, s->b_code);
 384         }else{
 385             put_bits(&s->pb, 8, 255);
 386         }
 387         put_bits(&s->pb, 2, s->intra_dc_precision);
 388
 389         assert(s->picture_structure == PICT_FRAME);
 390         put_bits(&s->pb, 2, s->picture_structure);
 391         if (s->progressive_sequence) {
 392             put_bits(&s->pb, 1, 0); /* no repeat */
 393         } else {
 394             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 395         }
 396         /* XXX: optimize the generation of this flag with entropy
 397            measures */
 398         s->frame_pred_frame_dct = s->progressive_sequence;
 399
 400         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 401         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 402         put_bits(&s->pb, 1, s->q_scale_type);
 403         put_bits(&s->pb, 1, s->intra_vlc_format);
 404         put_bits(&s->pb, 1, s->alternate_scan);
 405         put_bits(&s->pb, 1, s->repeat_first_field);
 406         s->progressive_frame = s->progressive_sequence;
 407         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 408         put_bits(&s->pb, 1, s->progressive_frame);
 409         put_bits(&s->pb, 1, 0); //composite_display_flag
 410     }
 411     if (s->scan_offset) {
 412         int i;
 413
 414         put_header(s, USER_START_CODE);
 415         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 416             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 417         }
 418     }
 419
 420     s->mb_y=0;
 421     ff_mpeg1_encode_slice_header(s);
 422 }
 423
 424 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 425                                 int has_mv, int field_motion)
 426 {
 427     put_bits(&s->pb, n, bits);
 428     if (!s->frame_pred_frame_dct) {
 429         if (has_mv)
 430             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 431         put_bits(&s->pb, 1, s->interlaced_dct);
 432     }
 433 }
 434
 435 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 436                                                    int16_t block[6][64],
 437                                                    int motion_x, int motion_y,
 438                                                    int mb_block_count)
 439 {
 440     int i, cbp;
 441     const int mb_x = s->mb_x;
 442     const int mb_y = s->mb_y;
 443     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 444
 445     /* compute cbp */
 446     cbp = 0;
 447     for(i=0;i<mb_block_count;i++) {
 448         if (s->block_last_index[i] >= 0)
 449             cbp |= 1 << (mb_block_count - 1 - i);
 450     }
 451
 452     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 453         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
 454         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 455         (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) |
 456         ((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))) {
 457         s->mb_skip_run++;
 458         s->qscale -= s->dquant;
 459         s->skip_count++;
 460         s->misc_bits++;
 461         s->last_bits++;
 462         if(s->pict_type == AV_PICTURE_TYPE_P){
 463             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 464             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 465         }
 466     } else {
 467         if(first_mb){
 468             assert(s->mb_skip_run == 0);
 469             encode_mb_skip_run(s, s->mb_x);
 470         }else{
 471             encode_mb_skip_run(s, s->mb_skip_run);
 472         }
 473
 474         if (s->pict_type == AV_PICTURE_TYPE_I) {
 475             if(s->dquant && cbp){
 476                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 477                 put_qscale(s);
 478             }else{
 479                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 480                 s->qscale -= s->dquant;
 481             }
 482             s->misc_bits+= get_bits_diff(s);
 483             s->i_count++;
 484         } else if (s->mb_intra) {
 485             if(s->dquant && cbp){
 486                 put_mb_modes(s, 6, 0x01, 0, 0);
 487                 put_qscale(s);
 488             }else{
 489                 put_mb_modes(s, 5, 0x03, 0, 0);
 490                 s->qscale -= s->dquant;
 491             }
 492             s->misc_bits+= get_bits_diff(s);
 493             s->i_count++;
 494             memset(s->last_mv, 0, sizeof(s->last_mv));
 495         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 496             if(s->mv_type == MV_TYPE_16X16){
 497                 if (cbp != 0) {
 498                     if ((motion_x|motion_y) == 0) {
 499                         if(s->dquant){
 500                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 501                             put_qscale(s);
 502                         }else{
 503                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 504                         }
 505                         s->misc_bits+= get_bits_diff(s);
 506                     } else {
 507                         if(s->dquant){
 508                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 509                             put_qscale(s);
 510                         }else{
 511                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 512                         }
 513                         s->misc_bits+= get_bits_diff(s);
 514                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 515                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 516                         s->mv_bits+= get_bits_diff(s);
 517                     }
 518                 } else {
 519                     put_bits(&s->pb, 3, 1); /* motion only */
 520                     if (!s->frame_pred_frame_dct)
 521                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 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->qscale -= s->dquant;
 526                     s->mv_bits+= get_bits_diff(s);
 527                 }
 528                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 529                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 530             }else{
 531                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 532
 533                 if (cbp) {
 534                     if(s->dquant){
 535                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 536                         put_qscale(s);
 537                     }else{
 538                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 539                     }
 540                 } else {
 541                     put_bits(&s->pb, 3, 1); /* motion only */
 542                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 543                     s->qscale -= s->dquant;
 544                 }
 545                 s->misc_bits+= get_bits_diff(s);
 546                 for(i=0; i<2; i++){
 547                     put_bits(&s->pb, 1, s->field_select[0][i]);
 548                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 549                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 550                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 551                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 552                 }
 553                 s->mv_bits+= get_bits_diff(s);
 554             }
 555             if(cbp) {
 556                 if (s->chroma_y_shift) {
 557                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 558                 } else {
 559                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 560                     put_sbits(&s->pb, 2, cbp);
 561                 }
 562             }
 563             s->f_count++;
 564         } else{
 565             if(s->mv_type == MV_TYPE_16X16){
 566                 if (cbp){    // With coded bloc pattern
 567                     if (s->dquant) {
 568                         if(s->mv_dir == MV_DIR_FORWARD)
 569                             put_mb_modes(s, 6, 3, 1, 0);
 570                         else
 571                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
 572                         put_qscale(s);
 573                     } else {
 574                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
 575                     }
 576                 }else{    // No coded bloc pattern
 577                     put_bits(&s->pb, 5-s->mv_dir, 2);
 578                     if (!s->frame_pred_frame_dct)
 579                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 580                     s->qscale -= s->dquant;
 581                 }
 582                 s->misc_bits += get_bits_diff(s);
 583                 if (s->mv_dir&MV_DIR_FORWARD){
 584                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 585                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 586                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 587                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 588                     s->f_count++;
 589                 }
 590                 if (s->mv_dir&MV_DIR_BACKWARD){
 591                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 592                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 593                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 594                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 595                     s->b_count++;
 596                 }
 597             }else{
 598                 assert(s->mv_type == MV_TYPE_FIELD);
 599                 assert(!s->frame_pred_frame_dct);
 600                 if (cbp){    // With coded bloc pattern
 601                     if (s->dquant) {
 602                         if(s->mv_dir == MV_DIR_FORWARD)
 603                             put_mb_modes(s, 6, 3, 1, 1);
 604                         else
 605                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
 606                         put_qscale(s);
 607                     } else {
 608                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
 609                     }
 610                 }else{    // No coded bloc pattern
 611                     put_bits(&s->pb, 5-s->mv_dir, 2);
 612                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 613                     s->qscale -= s->dquant;
 614                 }
 615                 s->misc_bits += get_bits_diff(s);
 616                 if (s->mv_dir&MV_DIR_FORWARD){
 617                     for(i=0; i<2; i++){
 618                         put_bits(&s->pb, 1, s->field_select[0][i]);
 619                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 620                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 621                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 622                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 623                     }
 624                     s->f_count++;
 625                 }
 626                 if (s->mv_dir&MV_DIR_BACKWARD){
 627                     for(i=0; i<2; i++){
 628                         put_bits(&s->pb, 1, s->field_select[1][i]);
 629                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 630                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 631                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 632                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 633                     }
 634                     s->b_count++;
 635                 }
 636             }
 637             s->mv_bits += get_bits_diff(s);
 638             if(cbp) {
 639                 if (s->chroma_y_shift) {
 640                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 641                 } else {
 642                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 643                     put_sbits(&s->pb, 2, cbp);
 644                 }
 645             }
 646         }
 647         for(i=0;i<mb_block_count;i++) {
 648             if (cbp & (1 << (mb_block_count - 1 - i))) {
 649                 mpeg1_encode_block(s, block[i], i);
 650             }
 651         }
 652         s->mb_skip_run = 0;
 653         if(s->mb_intra)
 654             s->i_tex_bits+= get_bits_diff(s);
 655         else
 656             s->p_tex_bits+= get_bits_diff(s);
 657     }
 658 }
 659
 660 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[6][64], int motion_x, int motion_y)
 661 {
 662     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 663     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 664 }
 665
 666 // RAL: Parameter added: f_or_b_code
 667 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 668 {
 669     if (val == 0) {
 670         /* zero vector */
 671         put_bits(&s->pb,
 672                  ff_mpeg12_mbMotionVectorTable[0][1],
 673                  ff_mpeg12_mbMotionVectorTable[0][0]);
 674     } else {
 675         int code, sign, bits;
 676         int bit_size = f_or_b_code - 1;
 677         int range = 1 << bit_size;
 678         /* modulo encoding */
 679         val = sign_extend(val, 5 + bit_size);
 680
 681         if (val >= 0) {
 682             val--;
 683             code = (val >> bit_size) + 1;
 684             bits = val & (range - 1);
 685             sign = 0;
 686         } else {
 687             val = -val;
 688             val--;
 689             code = (val >> bit_size) + 1;
 690             bits = val & (range - 1);
 691             sign = 1;
 692         }
 693
 694         assert(code > 0 && code <= 16);
 695
 696         put_bits(&s->pb,
 697                  ff_mpeg12_mbMotionVectorTable[code][1],
 698                  ff_mpeg12_mbMotionVectorTable[code][0]);
 699
 700         put_bits(&s->pb, 1, sign);
 701         if (bit_size > 0) {
 702             put_bits(&s->pb, bit_size, bits);
 703         }
 704     }
 705 }
 706
 707 av_cold void ff_mpeg1_encode_init(MpegEncContext *s)
 708 {
 709     static int done=0;
 710
 711     ff_mpeg12_common_init(s);
 712
 713     if(!done){
 714         int f_code;
 715         int mv;
 716         int i;
 717
 718         done=1;
 719         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 720         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 721
 722         for(i=0; i<64; i++)
 723         {
 724                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
 725                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
 726         }
 727
 728         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 729         if(s->intra_vlc_format)
 730             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 731
 732         /* build unified dc encoding tables */
 733         for(i=-255; i<256; i++)
 734         {
 735                 int adiff, index;
 736                 int bits, code;
 737                 int diff=i;
 738
 739                 adiff = FFABS(diff);
 740                 if(diff<0) diff--;
 741                 index = av_log2(2*adiff);
 742
 743                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
 744                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 745                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 746
 747                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 748                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 749                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 750         }
 751
 752         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 753             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 754                 int len;
 755
 756                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
 757                 else{
 758                     int val, bit_size, code;
 759
 760                     bit_size = f_code - 1;
 761
 762                     val=mv;
 763                     if (val < 0)
 764                         val = -val;
 765                     val--;
 766                     code = (val >> bit_size) + 1;
 767                     if(code<17){
 768                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
 769                     }else{
 770                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
 771                     }
 772                 }
 773
 774                 mv_penalty[f_code][mv+MAX_MV]= len;
 775             }
 776         }
 777
 778
 779         for(f_code=MAX_FCODE; f_code>0; f_code--){
 780             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 781                 fcode_tab[mv+MAX_MV]= f_code;
 782             }
 783         }
 784     }
 785     s->me.mv_penalty= mv_penalty;
 786     s->fcode_tab= fcode_tab;
 787     if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO){
 788         s->min_qcoeff=-255;
 789         s->max_qcoeff= 255;
 790     }else{
 791         s->min_qcoeff=-2047;
 792         s->max_qcoeff= 2047;
 793     }
 794     if (s->intra_vlc_format) {
 795         s->intra_ac_vlc_length=
 796         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 797     } else {
 798         s->intra_ac_vlc_length=
 799         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 800     }
 801     s->inter_ac_vlc_length=
 802     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 803 }
 804
 805 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 806 {
 807   if(((unsigned) (diff+255)) >= 511){
 808         int index;
 809
 810         if(diff<0){
 811             index= av_log2_16bit(-2*diff);
 812             diff--;
 813         }else{
 814             index= av_log2_16bit(2*diff);
 815         }
 816         if (component == 0) {
 817             put_bits(
 818                 &s->pb,
 819                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
 820                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 821         }else{
 822             put_bits(
 823                 &s->pb,
 824                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 825                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 826         }
 827   }else{
 828     if (component == 0) {
 829         put_bits(
 830             &s->pb,
 831             mpeg1_lum_dc_uni[diff+255]&0xFF,
 832             mpeg1_lum_dc_uni[diff+255]>>8);
 833     } else {
 834         put_bits(
 835             &s->pb,
 836             mpeg1_chr_dc_uni[diff+255]&0xFF,
 837             mpeg1_chr_dc_uni[diff+255]>>8);
 838     }
 839   }
 840 }
 841
 842 static void mpeg1_encode_block(MpegEncContext *s,
 843                                int16_t *block,
 844                                int n)
 845 {
 846     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 847     int code, component;
 848     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 849
 850     last_index = s->block_last_index[n];
 851
 852     /* DC coef */
 853     if (s->mb_intra) {
 854         component = (n <= 3 ? 0 : (n&1) + 1);
 855         dc = block[0]; /* overflow is impossible */
 856         diff = dc - s->last_dc[component];
 857         encode_dc(s, diff, component);
 858         s->last_dc[component] = dc;
 859         i = 1;
 860         if (s->intra_vlc_format)
 861             table_vlc = ff_rl_mpeg2.table_vlc;
 862     } else {
 863         /* encode the first coefficient : needs to be done here because
 864            it is handled slightly differently */
 865         level = block[0];
 866         if (abs(level) == 1) {
 867                 code = ((uint32_t)level >> 31); /* the sign bit */
 868                 put_bits(&s->pb, 2, code | 0x02);
 869                 i = 1;
 870         } else {
 871             i = 0;
 872             last_non_zero = -1;
 873             goto next_coef;
 874         }
 875     }
 876
 877     /* now quantify & encode AC coefs */
 878     last_non_zero = i - 1;
 879
 880     for(;i<=last_index;i++) {
 881         j = s->intra_scantable.permutated[i];
 882         level = block[j];
 883     next_coef:
 884         /* encode using VLC */
 885         if (level != 0) {
 886             run = i - last_non_zero - 1;
 887
 888             alevel= level;
 889             MASK_ABS(sign, alevel);
 890             sign&=1;
 891
 892             if (alevel <= mpeg1_max_level[0][run]){
 893                 code= mpeg1_index_run[0][run] + alevel - 1;
 894                 /* store the vlc & sign at once */
 895                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
 896             } else {
 897                 /* escape seems to be pretty rare <5% so I do not optimize it */
 898                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 899                 /* escape: only clip in this case */
 900                 put_bits(&s->pb, 6, run);
 901                 if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO){
 902                     if (alevel < 128) {
 903                         put_sbits(&s->pb, 8, level);
 904                     } else {
 905                         if (level < 0) {
 906                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 907                         } else {
 908                             put_sbits(&s->pb, 16, level);
 909                         }
 910                     }
 911                 }else{
 912                     put_sbits(&s->pb, 12, level);
 913                 }
 914             }
 915             last_non_zero = i;
 916         }
 917     }
 918     /* end of block */
 919     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 920 }
 921
 922 #define OFFSET(x) offsetof(MpegEncContext, x)
 923 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 924 #define COMMON_OPTS\
 925     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },\
 926     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE}, \
 927     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 928
 929 static const AVOption mpeg1_options[] = {
 930     COMMON_OPTS
 931     FF_MPV_COMMON_OPTS
 932     { NULL },
 933 };
 934
 935 static const AVOption mpeg2_options[] = {
 936     COMMON_OPTS
 937     { "non_linear_quant",    "Use nonlinear quantizer.",          OFFSET(q_scale_type),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 938     { "alternate_scan",      "Enable alternate scantable.",       OFFSET(alternate_scan),       AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 939     FF_MPV_COMMON_OPTS
 940     { NULL },
 941 };
 942
 943 #define mpeg12_class(x)\
 944 static const AVClass mpeg## x ##_class = {\
 945     .class_name   = "mpeg" #x "video encoder",\
 946     .item_name    = av_default_item_name,\
 947     .option       = mpeg## x ##_options,\
 948     .version      = LIBAVUTIL_VERSION_INT,\
 949 };
 950
 951 mpeg12_class(1)
 952 mpeg12_class(2)
 953
 954 AVCodec ff_mpeg1video_encoder = {
 955     .name                 = "mpeg1video",
 956     .type                 = AVMEDIA_TYPE_VIDEO,
 957     .id                   = AV_CODEC_ID_MPEG1VIDEO,
 958     .priv_data_size       = sizeof(MpegEncContext),
 959     .init                 = encode_init,
 960     .encode2              = ff_MPV_encode_picture,
 961     .close                = ff_MPV_encode_end,
 962     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
 963     .pix_fmts             = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,
 964                                                         AV_PIX_FMT_NONE },
 965     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 966     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
 967     .priv_class           = &mpeg1_class,
 968 };
 969
 970 AVCodec ff_mpeg2video_encoder = {
 971     .name                 = "mpeg2video",
 972     .type                 = AVMEDIA_TYPE_VIDEO,
 973     .id                   = AV_CODEC_ID_MPEG2VIDEO,
 974     .priv_data_size       = sizeof(MpegEncContext),
 975     .init                 = encode_init,
 976     .encode2              = ff_MPV_encode_picture,
 977     .close                = ff_MPV_encode_end,
 978     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
 979     .pix_fmts             = (const enum AVPixelFormat[]){
 980         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE
 981     },
 982     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 983     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
 984     .priv_class           = &mpeg2_class,
 985 };