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/log.h"
  37 #include "libavutil/opt.h"
  38
  39 static const uint8_t inv_non_linear_qscale[13] = {
  40     0, 2, 4, 6, 8,
  41     9,10,11,12,13,14,15,16,
  42 };
  43
  44 static const uint8_t svcd_scan_offset_placeholder[14] = {
  45     0x10, 0x0E,
  46     0x00, 0x80, 0x81,
  47     0x00, 0x80, 0x81,
  48     0xff, 0xff, 0xff,
  49     0xff, 0xff, 0xff,
  50 };
  51
  52 static void mpeg1_encode_block(MpegEncContext *s,
  53                          int16_t *block,
  54                          int component);
  55 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
  56
  57 static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
  58 static uint8_t fcode_tab[MAX_MV*2+1];
  59
  60 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
  61 static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
  62
  63 /* simple include everything table for dc, first byte is bits number next 3 are code*/
  64 static uint32_t mpeg1_lum_dc_uni[512];
  65 static uint32_t mpeg1_chr_dc_uni[512];
  66
  67 static uint8_t mpeg1_index_run[2][64];
  68 static int8_t mpeg1_max_level[2][64];
  69
  70 static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
  71     int i;
  72
  73     for(i=0; i<128; i++){
  74         int level= i-64;
  75         int run;
  76         if (!level)
  77             continue;
  78         for(run=0; run<64; run++){
  79             int len, code;
  80
  81             int alevel= FFABS(level);
  82
  83             if (alevel > rl->max_level[0][run])
  84                 code= 111; /*rl->n*/
  85             else
  86                 code= rl->index_run[0][run] + alevel - 1;
  87
  88             if (code < 111 /* rl->n */) {
  89                 /* length of vlc and sign */
  90                 len=   rl->table_vlc[code][1]+1;
  91             } else {
  92                 len=  rl->table_vlc[111/*rl->n*/][1]+6;
  93
  94                 if (alevel < 128) {
  95                     len += 8;
  96                 } else {
  97                     len += 16;
  98                 }
  99             }
 100
 101             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
 102         }
 103     }
 104 }
 105
 106
 107 static int find_frame_rate_index(MpegEncContext *s){
 108     int i;
 109     int64_t dmin= INT64_MAX;
 110     int64_t d;
 111
 112     for(i=1;i<14;i++) {
 113         int64_t n0 = 1001LL / ff_mpeg12_frame_rate_tab[i].den * ff_mpeg12_frame_rate_tab[i].num * s->avctx->time_base.num;
 114         int64_t n1= 1001LL*s->avctx->time_base.den;
 115         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL && i>=9) break;
 116
 117         d = FFABS(n0 - n1);
 118         if(d < dmin){
 119             dmin=d;
 120             s->frame_rate_index= i;
 121         }
 122     }
 123     if(dmin)
 124         return -1;
 125     else
 126         return 0;
 127 }
 128
 129 static av_cold int encode_init(AVCodecContext *avctx)
 130 {
 131     MpegEncContext *s = avctx->priv_data;
 132
 133     if(ff_MPV_encode_init(avctx) < 0)
 134         return -1;
 135
 136     if(find_frame_rate_index(s) < 0){
 137         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
 138             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
 139             return -1;
 140         }else{
 141             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);
 142         }
 143     }
 144
 145     if(avctx->profile == FF_PROFILE_UNKNOWN){
 146         if(avctx->level != FF_LEVEL_UNKNOWN){
 147             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 148             return -1;
 149         }
 150         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
 151     }
 152
 153     if(avctx->level == FF_LEVEL_UNKNOWN){
 154         if(avctx->profile == 0){ /* 4:2:2 */
 155             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
 156             else                                            avctx->level = 2; /* High */
 157         }else{
 158             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
 159                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 160                 return -1;
 161             }
 162             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
 163             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
 164             else                                            avctx->level = 4; /* High */
 165         }
 166     }
 167
 168     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 169         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 170         return -1;
 171     }
 172
 173     return 0;
 174 }
 175
 176 static void put_header(MpegEncContext *s, int header)
 177 {
 178     avpriv_align_put_bits(&s->pb);
 179     put_bits(&s->pb, 16, header>>16);
 180     put_sbits(&s->pb, 16, header);
 181 }
 182
 183 /* put sequence header if needed */
 184 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 185 {
 186         unsigned int vbv_buffer_size;
 187         unsigned int fps, v;
 188         int i;
 189         uint64_t time_code;
 190         float best_aspect_error= 1E10;
 191         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 192         int constraint_parameter_flag;
 193
 194         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 195
 196         if (s->current_picture.f.key_frame) {
 197             AVRational framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 198
 199             /* mpeg1 header repeated every gop */
 200             put_header(s, SEQ_START_CODE);
 201
 202             put_sbits(&s->pb, 12, s->width );
 203             put_sbits(&s->pb, 12, s->height);
 204
 205             for(i=1; i<15; i++){
 206                 float error= aspect_ratio;
 207                 if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <=1)
 208                     error-= 1.0/ff_mpeg1_aspect[i];
 209                 else
 210                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
 211
 212                 error= FFABS(error);
 213
 214                 if(error < best_aspect_error){
 215                     best_aspect_error= error;
 216                     s->aspect_ratio_info= i;
 217                 }
 218             }
 219
 220             put_bits(&s->pb, 4, s->aspect_ratio_info);
 221             put_bits(&s->pb, 4, s->frame_rate_index);
 222
 223             if(s->avctx->rc_max_rate){
 224                 v = (s->avctx->rc_max_rate + 399) / 400;
 225                 if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 226                     v = 0x3ffff;
 227             }else{
 228                 v= 0x3FFFF;
 229             }
 230
 231             if(s->avctx->rc_buffer_size)
 232                 vbv_buffer_size = s->avctx->rc_buffer_size;
 233             else
 234                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 235                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 236             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 237
 238             put_sbits(&s->pb, 18, v);
 239             put_bits(&s->pb, 1, 1); /* marker */
 240             put_sbits(&s->pb, 10, vbv_buffer_size);
 241
 242             constraint_parameter_flag=
 243                 s->width <= 768 && s->height <= 576 &&
 244                 s->mb_width * s->mb_height <= 396 &&
 245                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 246                 framerate.num <= framerate.den*30 &&
 247                 s->avctx->me_range && s->avctx->me_range < 128 &&
 248                 vbv_buffer_size <= 20 &&
 249                 v <= 1856000/400 &&
 250                 s->codec_id == AV_CODEC_ID_MPEG1VIDEO;
 251
 252             put_bits(&s->pb, 1, constraint_parameter_flag);
 253
 254             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 255             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 256
 257             if(s->codec_id == AV_CODEC_ID_MPEG2VIDEO){
 258                 put_header(s, EXT_START_CODE);
 259                 put_bits(&s->pb, 4, 1); //seq ext
 260
 261                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 262
 263                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 264                 put_bits(&s->pb, 4, s->avctx->level); //level
 265
 266                 put_bits(&s->pb, 1, s->progressive_sequence);
 267                 put_bits(&s->pb, 2, s->chroma_format);
 268                 put_bits(&s->pb, 2, s->width >>12);
 269                 put_bits(&s->pb, 2, s->height>>12);
 270                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 271                 put_bits(&s->pb, 1, 1); //marker
 272                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 273                 put_bits(&s->pb, 1, s->low_delay);
 274                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
 275                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
 276             }
 277
 278             put_header(s, GOP_START_CODE);
 279             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
 280             /* time code : we must convert from the real frame rate to a
 281                fake mpeg frame rate in case of low frame rate */
 282             fps = (framerate.num + framerate.den/2)/ framerate.den;
 283             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
 284
 285             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 286             if (s->drop_frame_timecode) {
 287                 /* only works for NTSC 29.97 */
 288                 int d = time_code / 17982;
 289                 int m = time_code % 17982;
 290                 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
 291                 time_code += 18 * d + 2 * ((m - 2) / 1798);
 292             }
 293             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 294             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 295             put_bits(&s->pb, 1, 1);
 296             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 297             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 298             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 299             put_bits(&s->pb, 1, 0); /* broken link */
 300         }
 301 }
 302
 303 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 304     while (run >= 33) {
 305         put_bits(&s->pb, 11, 0x008);
 306         run -= 33;
 307     }
 308     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 309              ff_mpeg12_mbAddrIncrTable[run][0]);
 310 }
 311
 312 static av_always_inline void put_qscale(MpegEncContext *s)
 313 {
 314     if(s->q_scale_type){
 315         assert(s->qscale>=1 && s->qscale <=12);
 316         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 317     }else{
 318         put_bits(&s->pb, 5, s->qscale);
 319     }
 320 }
 321
 322 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 323     if (s->height > 2800) {
 324         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 325         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
 326     } else {
 327         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 328     }
 329     put_qscale(s);
 330     put_bits(&s->pb, 1, 0); /* slice extra information */
 331 }
 332
 333 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 334 {
 335     mpeg1_encode_sequence_header(s);
 336
 337     /* mpeg1 picture header */
 338     put_header(s, PICTURE_START_CODE);
 339     /* temporal reference */
 340
 341     // RAL: s->picture_number instead of s->fake_picture_number
 342     put_bits(&s->pb, 10, (s->picture_number -
 343                           s->gop_picture_number) & 0x3ff);
 344     put_bits(&s->pb, 3, s->pict_type);
 345
 346     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 347     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 348
 349     // RAL: Forward f_code also needed for B frames
 350     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 351         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 352         if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 353             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 354         else
 355             put_bits(&s->pb, 3, 7); /* forward_f_code */
 356     }
 357
 358     // RAL: Backward f_code necessary for B frames
 359     if (s->pict_type == AV_PICTURE_TYPE_B) {
 360         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 361         if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 362             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 363         else
 364             put_bits(&s->pb, 3, 7); /* backward_f_code */
 365     }
 366
 367     put_bits(&s->pb, 1, 0); /* extra bit picture */
 368
 369     s->frame_pred_frame_dct = 1;
 370     if(s->codec_id == AV_CODEC_ID_MPEG2VIDEO){
 371         put_header(s, EXT_START_CODE);
 372         put_bits(&s->pb, 4, 8); //pic ext
 373         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 374             put_bits(&s->pb, 4, s->f_code);
 375             put_bits(&s->pb, 4, s->f_code);
 376         }else{
 377             put_bits(&s->pb, 8, 255);
 378         }
 379         if (s->pict_type == AV_PICTURE_TYPE_B) {
 380             put_bits(&s->pb, 4, s->b_code);
 381             put_bits(&s->pb, 4, s->b_code);
 382         }else{
 383             put_bits(&s->pb, 8, 255);
 384         }
 385         put_bits(&s->pb, 2, s->intra_dc_precision);
 386
 387         assert(s->picture_structure == PICT_FRAME);
 388         put_bits(&s->pb, 2, s->picture_structure);
 389         if (s->progressive_sequence) {
 390             put_bits(&s->pb, 1, 0); /* no repeat */
 391         } else {
 392             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 393         }
 394         /* XXX: optimize the generation of this flag with entropy
 395            measures */
 396         s->frame_pred_frame_dct = s->progressive_sequence;
 397
 398         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 399         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 400         put_bits(&s->pb, 1, s->q_scale_type);
 401         put_bits(&s->pb, 1, s->intra_vlc_format);
 402         put_bits(&s->pb, 1, s->alternate_scan);
 403         put_bits(&s->pb, 1, s->repeat_first_field);
 404         s->progressive_frame = s->progressive_sequence;
 405         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 406         put_bits(&s->pb, 1, s->progressive_frame);
 407         put_bits(&s->pb, 1, 0); //composite_display_flag
 408     }
 409     if (s->scan_offset) {
 410         int i;
 411
 412         put_header(s, USER_START_CODE);
 413         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 414             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 415         }
 416     }
 417
 418     s->mb_y=0;
 419     ff_mpeg1_encode_slice_header(s);
 420 }
 421
 422 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 423                                 int has_mv, int field_motion)
 424 {
 425     put_bits(&s->pb, n, bits);
 426     if (!s->frame_pred_frame_dct) {
 427         if (has_mv)
 428             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 429         put_bits(&s->pb, 1, s->interlaced_dct);
 430     }
 431 }
 432
 433 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 434                                                    int16_t block[6][64],
 435                                                    int motion_x, int motion_y,
 436                                                    int mb_block_count)
 437 {
 438     int i, cbp;
 439     const int mb_x = s->mb_x;
 440     const int mb_y = s->mb_y;
 441     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 442
 443     /* compute cbp */
 444     cbp = 0;
 445     for(i=0;i<mb_block_count;i++) {
 446         if (s->block_last_index[i] >= 0)
 447             cbp |= 1 << (mb_block_count - 1 - i);
 448     }
 449
 450     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 451         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
 452         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 453         (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) |
 454         ((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))) {
 455         s->mb_skip_run++;
 456         s->qscale -= s->dquant;
 457         s->skip_count++;
 458         s->misc_bits++;
 459         s->last_bits++;
 460         if(s->pict_type == AV_PICTURE_TYPE_P){
 461             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 462             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 463         }
 464     } else {
 465         if(first_mb){
 466             assert(s->mb_skip_run == 0);
 467             encode_mb_skip_run(s, s->mb_x);
 468         }else{
 469             encode_mb_skip_run(s, s->mb_skip_run);
 470         }
 471
 472         if (s->pict_type == AV_PICTURE_TYPE_I) {
 473             if(s->dquant && cbp){
 474                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 475                 put_qscale(s);
 476             }else{
 477                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 478                 s->qscale -= s->dquant;
 479             }
 480             s->misc_bits+= get_bits_diff(s);
 481             s->i_count++;
 482         } else if (s->mb_intra) {
 483             if(s->dquant && cbp){
 484                 put_mb_modes(s, 6, 0x01, 0, 0);
 485                 put_qscale(s);
 486             }else{
 487                 put_mb_modes(s, 5, 0x03, 0, 0);
 488                 s->qscale -= s->dquant;
 489             }
 490             s->misc_bits+= get_bits_diff(s);
 491             s->i_count++;
 492             memset(s->last_mv, 0, sizeof(s->last_mv));
 493         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 494             if(s->mv_type == MV_TYPE_16X16){
 495                 if (cbp != 0) {
 496                     if ((motion_x|motion_y) == 0) {
 497                         if(s->dquant){
 498                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 499                             put_qscale(s);
 500                         }else{
 501                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 502                         }
 503                         s->misc_bits+= get_bits_diff(s);
 504                     } else {
 505                         if(s->dquant){
 506                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 507                             put_qscale(s);
 508                         }else{
 509                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 510                         }
 511                         s->misc_bits+= get_bits_diff(s);
 512                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 513                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 514                         s->mv_bits+= get_bits_diff(s);
 515                     }
 516                 } else {
 517                     put_bits(&s->pb, 3, 1); /* motion only */
 518                     if (!s->frame_pred_frame_dct)
 519                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 520                     s->misc_bits+= get_bits_diff(s);
 521                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 522                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 523                     s->qscale -= s->dquant;
 524                     s->mv_bits+= get_bits_diff(s);
 525                 }
 526                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 527                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 528             }else{
 529                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 530
 531                 if (cbp) {
 532                     if(s->dquant){
 533                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 534                         put_qscale(s);
 535                     }else{
 536                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 537                     }
 538                 } else {
 539                     put_bits(&s->pb, 3, 1); /* motion only */
 540                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 541                     s->qscale -= s->dquant;
 542                 }
 543                 s->misc_bits+= get_bits_diff(s);
 544                 for(i=0; i<2; i++){
 545                     put_bits(&s->pb, 1, s->field_select[0][i]);
 546                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 547                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 548                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 549                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 550                 }
 551                 s->mv_bits+= get_bits_diff(s);
 552             }
 553             if(cbp) {
 554                 if (s->chroma_y_shift) {
 555                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 556                 } else {
 557                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 558                     put_sbits(&s->pb, 2, cbp);
 559                 }
 560             }
 561             s->f_count++;
 562         } else{
 563             if(s->mv_type == MV_TYPE_16X16){
 564                 if (cbp){    // With coded bloc pattern
 565                     if (s->dquant) {
 566                         if(s->mv_dir == MV_DIR_FORWARD)
 567                             put_mb_modes(s, 6, 3, 1, 0);
 568                         else
 569                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
 570                         put_qscale(s);
 571                     } else {
 572                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
 573                     }
 574                 }else{    // No coded bloc pattern
 575                     put_bits(&s->pb, 5-s->mv_dir, 2);
 576                     if (!s->frame_pred_frame_dct)
 577                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 578                     s->qscale -= s->dquant;
 579                 }
 580                 s->misc_bits += get_bits_diff(s);
 581                 if (s->mv_dir&MV_DIR_FORWARD){
 582                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 583                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 584                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 585                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 586                     s->f_count++;
 587                 }
 588                 if (s->mv_dir&MV_DIR_BACKWARD){
 589                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 590                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 591                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 592                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 593                     s->b_count++;
 594                 }
 595             }else{
 596                 assert(s->mv_type == MV_TYPE_FIELD);
 597                 assert(!s->frame_pred_frame_dct);
 598                 if (cbp){    // With coded bloc pattern
 599                     if (s->dquant) {
 600                         if(s->mv_dir == MV_DIR_FORWARD)
 601                             put_mb_modes(s, 6, 3, 1, 1);
 602                         else
 603                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
 604                         put_qscale(s);
 605                     } else {
 606                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
 607                     }
 608                 }else{    // No coded bloc pattern
 609                     put_bits(&s->pb, 5-s->mv_dir, 2);
 610                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 611                     s->qscale -= s->dquant;
 612                 }
 613                 s->misc_bits += get_bits_diff(s);
 614                 if (s->mv_dir&MV_DIR_FORWARD){
 615                     for(i=0; i<2; i++){
 616                         put_bits(&s->pb, 1, s->field_select[0][i]);
 617                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 618                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 619                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 620                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 621                     }
 622                     s->f_count++;
 623                 }
 624                 if (s->mv_dir&MV_DIR_BACKWARD){
 625                     for(i=0; i<2; i++){
 626                         put_bits(&s->pb, 1, s->field_select[1][i]);
 627                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 628                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 629                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 630                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 631                     }
 632                     s->b_count++;
 633                 }
 634             }
 635             s->mv_bits += get_bits_diff(s);
 636             if(cbp) {
 637                 if (s->chroma_y_shift) {
 638                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 639                 } else {
 640                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 641                     put_sbits(&s->pb, 2, cbp);
 642                 }
 643             }
 644         }
 645         for(i=0;i<mb_block_count;i++) {
 646             if (cbp & (1 << (mb_block_count - 1 - i))) {
 647                 mpeg1_encode_block(s, block[i], i);
 648             }
 649         }
 650         s->mb_skip_run = 0;
 651         if(s->mb_intra)
 652             s->i_tex_bits+= get_bits_diff(s);
 653         else
 654             s->p_tex_bits+= get_bits_diff(s);
 655     }
 656 }
 657
 658 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[6][64], int motion_x, int motion_y)
 659 {
 660     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 661     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 662 }
 663
 664 // RAL: Parameter added: f_or_b_code
 665 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 666 {
 667     if (val == 0) {
 668         /* zero vector */
 669         put_bits(&s->pb,
 670                  ff_mpeg12_mbMotionVectorTable[0][1],
 671                  ff_mpeg12_mbMotionVectorTable[0][0]);
 672     } else {
 673         int code, sign, bits;
 674         int bit_size = f_or_b_code - 1;
 675         int range = 1 << bit_size;
 676         /* modulo encoding */
 677         val = sign_extend(val, 5 + bit_size);
 678
 679         if (val >= 0) {
 680             val--;
 681             code = (val >> bit_size) + 1;
 682             bits = val & (range - 1);
 683             sign = 0;
 684         } else {
 685             val = -val;
 686             val--;
 687             code = (val >> bit_size) + 1;
 688             bits = val & (range - 1);
 689             sign = 1;
 690         }
 691
 692         assert(code > 0 && code <= 16);
 693
 694         put_bits(&s->pb,
 695                  ff_mpeg12_mbMotionVectorTable[code][1],
 696                  ff_mpeg12_mbMotionVectorTable[code][0]);
 697
 698         put_bits(&s->pb, 1, sign);
 699         if (bit_size > 0) {
 700             put_bits(&s->pb, bit_size, bits);
 701         }
 702     }
 703 }
 704
 705 void ff_mpeg1_encode_init(MpegEncContext *s)
 706 {
 707     static int done=0;
 708
 709     ff_mpeg12_common_init(s);
 710
 711     if(!done){
 712         int f_code;
 713         int mv;
 714         int i;
 715
 716         done=1;
 717         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 718         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 719
 720         for(i=0; i<64; i++)
 721         {
 722                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
 723                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
 724         }
 725
 726         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 727         if(s->intra_vlc_format)
 728             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 729
 730         /* build unified dc encoding tables */
 731         for(i=-255; i<256; i++)
 732         {
 733                 int adiff, index;
 734                 int bits, code;
 735                 int diff=i;
 736
 737                 adiff = FFABS(diff);
 738                 if(diff<0) diff--;
 739                 index = av_log2(2*adiff);
 740
 741                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
 742                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 743                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 744
 745                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 746                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 747                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 748         }
 749
 750         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 751             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 752                 int len;
 753
 754                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
 755                 else{
 756                     int val, bit_size, code;
 757
 758                     bit_size = f_code - 1;
 759
 760                     val=mv;
 761                     if (val < 0)
 762                         val = -val;
 763                     val--;
 764                     code = (val >> bit_size) + 1;
 765                     if(code<17){
 766                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
 767                     }else{
 768                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
 769                     }
 770                 }
 771
 772                 mv_penalty[f_code][mv+MAX_MV]= len;
 773             }
 774         }
 775
 776
 777         for(f_code=MAX_FCODE; f_code>0; f_code--){
 778             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 779                 fcode_tab[mv+MAX_MV]= f_code;
 780             }
 781         }
 782     }
 783     s->me.mv_penalty= mv_penalty;
 784     s->fcode_tab= fcode_tab;
 785     if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO){
 786         s->min_qcoeff=-255;
 787         s->max_qcoeff= 255;
 788     }else{
 789         s->min_qcoeff=-2047;
 790         s->max_qcoeff= 2047;
 791     }
 792     if (s->intra_vlc_format) {
 793         s->intra_ac_vlc_length=
 794         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 795     } else {
 796         s->intra_ac_vlc_length=
 797         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 798     }
 799     s->inter_ac_vlc_length=
 800     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 801 }
 802
 803 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 804 {
 805   if(((unsigned) (diff+255)) >= 511){
 806         int index;
 807
 808         if(diff<0){
 809             index= av_log2_16bit(-2*diff);
 810             diff--;
 811         }else{
 812             index= av_log2_16bit(2*diff);
 813         }
 814         if (component == 0) {
 815             put_bits(
 816                 &s->pb,
 817                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
 818                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 819         }else{
 820             put_bits(
 821                 &s->pb,
 822                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 823                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 824         }
 825   }else{
 826     if (component == 0) {
 827         put_bits(
 828             &s->pb,
 829             mpeg1_lum_dc_uni[diff+255]&0xFF,
 830             mpeg1_lum_dc_uni[diff+255]>>8);
 831     } else {
 832         put_bits(
 833             &s->pb,
 834             mpeg1_chr_dc_uni[diff+255]&0xFF,
 835             mpeg1_chr_dc_uni[diff+255]>>8);
 836     }
 837   }
 838 }
 839
 840 static void mpeg1_encode_block(MpegEncContext *s,
 841                                int16_t *block,
 842                                int n)
 843 {
 844     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 845     int code, component;
 846     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 847
 848     last_index = s->block_last_index[n];
 849
 850     /* DC coef */
 851     if (s->mb_intra) {
 852         component = (n <= 3 ? 0 : (n&1) + 1);
 853         dc = block[0]; /* overflow is impossible */
 854         diff = dc - s->last_dc[component];
 855         encode_dc(s, diff, component);
 856         s->last_dc[component] = dc;
 857         i = 1;
 858         if (s->intra_vlc_format)
 859             table_vlc = ff_rl_mpeg2.table_vlc;
 860     } else {
 861         /* encode the first coefficient : needs to be done here because
 862            it is handled slightly differently */
 863         level = block[0];
 864         if (abs(level) == 1) {
 865                 code = ((uint32_t)level >> 31); /* the sign bit */
 866                 put_bits(&s->pb, 2, code | 0x02);
 867                 i = 1;
 868         } else {
 869             i = 0;
 870             last_non_zero = -1;
 871             goto next_coef;
 872         }
 873     }
 874
 875     /* now quantify & encode AC coefs */
 876     last_non_zero = i - 1;
 877
 878     for(;i<=last_index;i++) {
 879         j = s->intra_scantable.permutated[i];
 880         level = block[j];
 881     next_coef:
 882         /* encode using VLC */
 883         if (level != 0) {
 884             run = i - last_non_zero - 1;
 885
 886             alevel= level;
 887             MASK_ABS(sign, alevel);
 888             sign&=1;
 889
 890             if (alevel <= mpeg1_max_level[0][run]){
 891                 code= mpeg1_index_run[0][run] + alevel - 1;
 892                 /* store the vlc & sign at once */
 893                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
 894             } else {
 895                 /* escape seems to be pretty rare <5% so I do not optimize it */
 896                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 897                 /* escape: only clip in this case */
 898                 put_bits(&s->pb, 6, run);
 899                 if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO){
 900                     if (alevel < 128) {
 901                         put_sbits(&s->pb, 8, level);
 902                     } else {
 903                         if (level < 0) {
 904                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 905                         } else {
 906                             put_sbits(&s->pb, 16, level);
 907                         }
 908                     }
 909                 }else{
 910                     put_sbits(&s->pb, 12, level);
 911                 }
 912             }
 913             last_non_zero = i;
 914         }
 915     }
 916     /* end of block */
 917     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 918 }
 919
 920 #define OFFSET(x) offsetof(MpegEncContext, x)
 921 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 922 #define COMMON_OPTS\
 923     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },\
 924     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE}, \
 925     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 926
 927 static const AVOption mpeg1_options[] = {
 928     COMMON_OPTS
 929     FF_MPV_COMMON_OPTS
 930     { NULL },
 931 };
 932
 933 static const AVOption mpeg2_options[] = {
 934     COMMON_OPTS
 935     { "non_linear_quant",    "Use nonlinear quantizer.",          OFFSET(q_scale_type),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 936     { "alternate_scan",      "Enable alternate scantable.",       OFFSET(alternate_scan),       AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 937     FF_MPV_COMMON_OPTS
 938     { NULL },
 939 };
 940
 941 #define mpeg12_class(x)\
 942 static const AVClass mpeg## x ##_class = {\
 943     .class_name   = "mpeg" #x "video encoder",\
 944     .item_name    = av_default_item_name,\
 945     .option       = mpeg## x ##_options,\
 946     .version      = LIBAVUTIL_VERSION_INT,\
 947 };
 948
 949 mpeg12_class(1)
 950 mpeg12_class(2)
 951
 952 AVCodec ff_mpeg1video_encoder = {
 953     .name                 = "mpeg1video",
 954     .type                 = AVMEDIA_TYPE_VIDEO,
 955     .id                   = AV_CODEC_ID_MPEG1VIDEO,
 956     .priv_data_size       = sizeof(MpegEncContext),
 957     .init                 = encode_init,
 958     .encode2              = ff_MPV_encode_picture,
 959     .close                = ff_MPV_encode_end,
 960     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
 961     .pix_fmts             = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,
 962                                                         AV_PIX_FMT_NONE },
 963     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 964     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
 965     .priv_class           = &mpeg1_class,
 966 };
 967
 968 AVCodec ff_mpeg2video_encoder = {
 969     .name                 = "mpeg2video",
 970     .type                 = AVMEDIA_TYPE_VIDEO,
 971     .id                   = AV_CODEC_ID_MPEG2VIDEO,
 972     .priv_data_size       = sizeof(MpegEncContext),
 973     .init                 = encode_init,
 974     .encode2              = ff_MPV_encode_picture,
 975     .close                = ff_MPV_encode_end,
 976     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
 977     .pix_fmts             = (const enum AVPixelFormat[]){
 978         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE
 979     },
 980     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 981     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
 982     .priv_class           = &mpeg2_class,
 983 };