src/third_party/ffmpeg/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 <stdint.h>
  29
  30 #include "libavutil/attributes.h"
  31 #include "libavutil/avassert.h"
  32 #include "libavutil/log.h"
  33 #include "libavutil/opt.h"
  34 #include "libavutil/timecode.h"
  35 #include "libavutil/stereo3d.h"
  36
  37 #include "avcodec.h"
  38 #include "bytestream.h"
  39 #include "mathops.h"
  40 #include "mpeg12.h"
  41 #include "mpeg12data.h"
  42 #include "mpegutils.h"
  43 #include "mpegvideo.h"
  44
  45
  46 static const uint8_t inv_non_linear_qscale[] = {
  47     0, 2, 4, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16,
  48 };
  49
  50 static const uint8_t svcd_scan_offset_placeholder[] = {
  51     0x10, 0x0E, 0x00, 0x80, 0x81, 0x00, 0x80,
  52     0x81, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  53 };
  54
  55 static uint8_t mv_penalty[MAX_FCODE + 1][MAX_MV * 2 + 1];
  56 static uint8_t fcode_tab[MAX_MV * 2 + 1];
  57
  58 static uint8_t uni_mpeg1_ac_vlc_len[64 * 64 * 2];
  59 static uint8_t uni_mpeg2_ac_vlc_len[64 * 64 * 2];
  60
  61 /* simple include everything table for dc, first byte is bits
  62  * number next 3 are code */
  63 static uint32_t mpeg1_lum_dc_uni[512];
  64 static uint32_t mpeg1_chr_dc_uni[512];
  65
  66 static uint8_t mpeg1_index_run[2][64];
  67 static int8_t  mpeg1_max_level[2][64];
  68
  69 static av_cold void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len)
  70 {
  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             int alevel = FFABS(level);
  81
  82             if (alevel > rl->max_level[0][run])
  83                 code = 111;                         /* rl->n */
  84             else
  85                 code = rl->index_run[0][run] + alevel - 1;
  86
  87             if (code < 111) {                       /* rl->n */
  88                 /* length of VLC and sign */
  89                 len = rl->table_vlc[code][1] + 1;
  90             } else {
  91                 len = rl->table_vlc[111 /* rl->n */][1] + 6;
  92
  93                 if (alevel < 128)
  94                     len += 8;
  95                 else
  96                     len += 16;
  97             }
  98
  99             uni_ac_vlc_len[UNI_AC_ENC_INDEX(run, i)] = len;
 100         }
 101     }
 102 }
 103
 104 static int find_frame_rate_index(MpegEncContext *s)
 105 {
 106     int i;
 107     AVRational bestq = (AVRational) {0, 0};
 108     AVRational ext;
 109     AVRational target = av_inv_q(s->avctx->time_base);
 110
 111     for (i = 1; i < 14; i++) {
 112         if (s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL &&
 113             i >= 9)
 114             break;
 115
 116         for (ext.num=1; ext.num <= 4; ext.num++) {
 117             for (ext.den=1; ext.den <= 32; ext.den++) {
 118                 AVRational q = av_mul_q(ext, ff_mpeg12_frame_rate_tab[i]);
 119
 120                 if (s->codec_id != AV_CODEC_ID_MPEG2VIDEO && (ext.den!=1 || ext.num!=1))
 121                     continue;
 122                 if (av_gcd(ext.den, ext.num) != 1)
 123                     continue;
 124
 125                 if (    bestq.num==0
 126                     || av_nearer_q(target, bestq, q) < 0
 127                     || ext.num==1 && ext.den==1 && av_nearer_q(target, bestq, q) == 0) {
 128                     bestq               = q;
 129                     s->frame_rate_index = i;
 130                     s->mpeg2_frame_rate_ext.num = ext.num;
 131                     s->mpeg2_frame_rate_ext.den = ext.den;
 132                 }
 133             }
 134         }
 135     }
 136
 137     if (av_cmp_q(target, bestq))
 138         return -1;
 139     else
 140         return 0;
 141 }
 142
 143 static av_cold int encode_init(AVCodecContext *avctx)
 144 {
 145     MpegEncContext *s = avctx->priv_data;
 146
 147     if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && avctx->height > 2800)
 148         avctx->thread_count = 1;
 149
 150     if (ff_mpv_encode_init(avctx) < 0)
 151         return -1;
 152
 153     if (find_frame_rate_index(s) < 0) {
 154         if (s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
 155             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n",
 156                    avctx->time_base.den, avctx->time_base.num);
 157             return -1;
 158         } else {
 159             av_log(avctx, AV_LOG_INFO,
 160                    "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n",
 161                    avctx->time_base.den, avctx->time_base.num);
 162         }
 163     }
 164
 165     if (avctx->profile == FF_PROFILE_UNKNOWN) {
 166         if (avctx->level != FF_LEVEL_UNKNOWN) {
 167             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 168             return -1;
 169         }
 170         /* Main or 4:2:2 */
 171         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0;
 172     }
 173
 174     if (avctx->level == FF_LEVEL_UNKNOWN) {
 175         if (avctx->profile == 0) {                  /* 4:2:2 */
 176             if (avctx->width <= 720 && avctx->height <= 608)
 177                 avctx->level = 5;                   /* Main */
 178             else
 179                 avctx->level = 2;                   /* High */
 180         } else {
 181             if (avctx->profile != 1 && s->chroma_format != CHROMA_420) {
 182                 av_log(avctx, AV_LOG_ERROR,
 183                        "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 184                 return -1;
 185             }
 186             if (avctx->width <= 720 && avctx->height <= 576)
 187                 avctx->level = 8;                   /* Main */
 188             else if (avctx->width <= 1440)
 189                 avctx->level = 6;                   /* High 1440 */
 190             else
 191                 avctx->level = 4;                   /* High */
 192         }
 193     }
 194
 195     if ((avctx->width & 0xFFF) == 0 && (avctx->height & 0xFFF) == 1) {
 196         av_log(avctx, AV_LOG_ERROR, "Width / Height is invalid for MPEG2\n");
 197         return AVERROR(EINVAL);
 198     }
 199
 200     if (s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
 201         if ((avctx->width & 0xFFF) == 0 || (avctx->height & 0xFFF) == 0) {
 202             av_log(avctx, AV_LOG_ERROR, "Width or Height are not allowed to be multiples of 4096\n"
 203                                         "add '-strict %d' if you want to use them anyway.\n", FF_COMPLIANCE_UNOFFICIAL);
 204             return AVERROR(EINVAL);
 205         }
 206     }
 207
 208     s->drop_frame_timecode = s->drop_frame_timecode || !!(avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE);
 209     if (s->drop_frame_timecode)
 210         s->tc.flags |= AV_TIMECODE_FLAG_DROPFRAME;
 211     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 212         av_log(avctx, AV_LOG_ERROR,
 213                "Drop frame time code only allowed with 1001/30000 fps\n");
 214         return -1;
 215     }
 216
 217     if (s->tc_opt_str) {
 218         AVRational rate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 219         int ret = av_timecode_init_from_string(&s->tc, rate, s->tc_opt_str, s);
 220         if (ret < 0)
 221             return ret;
 222         s->drop_frame_timecode = !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME);
 223         s->avctx->timecode_frame_start = s->tc.start;
 224     } else {
 225         s->avctx->timecode_frame_start = 0; // default is -1
 226     }
 227     return 0;
 228 }
 229
 230 static void put_header(MpegEncContext *s, int header)
 231 {
 232     avpriv_align_put_bits(&s->pb);
 233     put_bits(&s->pb, 16, header >> 16);
 234     put_sbits(&s->pb, 16, header);
 235 }
 236
 237 /* put sequence header if needed */
 238 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 239 {
 240     unsigned int vbv_buffer_size, fps, v;
 241     int i, constraint_parameter_flag;
 242     uint64_t time_code;
 243     int64_t best_aspect_error = INT64_MAX;
 244     AVRational aspect_ratio = s->avctx->sample_aspect_ratio;
 245
 246     if (aspect_ratio.num == 0 || aspect_ratio.den == 0)
 247         aspect_ratio = (AVRational){1,1};             // pixel aspect 1.1 (VGA)
 248
 249     if (s->current_picture.f->key_frame) {
 250         AVRational framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 251
 252         /* mpeg1 header repeated every gop */
 253         put_header(s, SEQ_START_CODE);
 254
 255         put_sbits(&s->pb, 12, s->width  & 0xFFF);
 256         put_sbits(&s->pb, 12, s->height & 0xFFF);
 257
 258         for (i = 1; i < 15; i++) {
 259             int64_t error = aspect_ratio.num * (1LL<<32) / aspect_ratio.den;
 260             if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <= 1)
 261                 error -= (1LL<<32) / ff_mpeg1_aspect[i];
 262             else
 263                 error -= (1LL<<32)*ff_mpeg2_aspect[i].num * s->height / s->width / ff_mpeg2_aspect[i].den;
 264
 265             error = FFABS(error);
 266
 267             if (error - 2 <= best_aspect_error) {
 268                 best_aspect_error    = error;
 269                 s->aspect_ratio_info = i;
 270             }
 271         }
 272
 273         put_bits(&s->pb, 4, s->aspect_ratio_info);
 274         put_bits(&s->pb, 4, s->frame_rate_index);
 275
 276         if (s->avctx->rc_max_rate) {
 277             v = (s->avctx->rc_max_rate + 399) / 400;
 278             if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 279                 v = 0x3ffff;
 280         } else {
 281             v = 0x3FFFF;
 282         }
 283
 284         if (s->avctx->rc_buffer_size)
 285             vbv_buffer_size = s->avctx->rc_buffer_size;
 286         else
 287             /* VBV calculation: Scaled so that a VCD has the proper
 288              * VBV size of 40 kilobytes */
 289             vbv_buffer_size = ((20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 290         vbv_buffer_size = (vbv_buffer_size + 16383) / 16384;
 291
 292         put_sbits(&s->pb, 18, v);
 293         put_bits(&s->pb, 1, 1);         // marker
 294         put_sbits(&s->pb, 10, vbv_buffer_size);
 295
 296         constraint_parameter_flag =
 297             s->width  <= 768                                    &&
 298             s->height <= 576                                    &&
 299             s->mb_width * s->mb_height                 <= 396   &&
 300             s->mb_width * s->mb_height * framerate.num <= 396 * 25 * framerate.den &&
 301             framerate.num <= framerate.den * 30                 &&
 302             s->avctx->me_range                                  &&
 303             s->avctx->me_range < 128                            &&
 304             vbv_buffer_size <= 20                               &&
 305             v <= 1856000 / 400                                  &&
 306             s->codec_id == AV_CODEC_ID_MPEG1VIDEO;
 307
 308         put_bits(&s->pb, 1, constraint_parameter_flag);
 309
 310         ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 311         ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 312
 313         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 314             AVFrameSideData *side_data;
 315             int width = s->width;
 316             int height = s->height;
 317             int use_seq_disp_ext;
 318
 319             put_header(s, EXT_START_CODE);
 320             put_bits(&s->pb, 4, 1);                 // seq ext
 321
 322             put_bits(&s->pb, 1, s->avctx->profile == 0); // escx 1 for 4:2:2 profile
 323
 324             put_bits(&s->pb, 3, s->avctx->profile); // profile
 325             put_bits(&s->pb, 4, s->avctx->level);   // level
 326
 327             put_bits(&s->pb, 1, s->progressive_sequence);
 328             put_bits(&s->pb, 2, s->chroma_format);
 329             put_bits(&s->pb, 2, s->width  >> 12);
 330             put_bits(&s->pb, 2, s->height >> 12);
 331             put_bits(&s->pb, 12, v >> 18);          // bitrate ext
 332             put_bits(&s->pb, 1, 1);                 // marker
 333             put_bits(&s->pb, 8, vbv_buffer_size >> 10); // vbv buffer ext
 334             put_bits(&s->pb, 1, s->low_delay);
 335             put_bits(&s->pb, 2, s->mpeg2_frame_rate_ext.num-1); // frame_rate_ext_n
 336             put_bits(&s->pb, 5, s->mpeg2_frame_rate_ext.den-1); // frame_rate_ext_d
 337
 338             side_data = av_frame_get_side_data(s->current_picture_ptr->f, AV_FRAME_DATA_PANSCAN);
 339             if (side_data) {
 340                 AVPanScan *pan_scan = (AVPanScan *)side_data->data;
 341                 if (pan_scan->width && pan_scan->height) {
 342                     width = pan_scan->width >> 4;
 343                     height = pan_scan->height >> 4;
 344                 }
 345             }
 346
 347             use_seq_disp_ext = (width != s->width ||
 348                                 height != s->height ||
 349                                 s->avctx->color_primaries != AVCOL_PRI_UNSPECIFIED ||
 350                                 s->avctx->color_trc != AVCOL_TRC_UNSPECIFIED ||
 351                                 s->avctx->colorspace != AVCOL_SPC_UNSPECIFIED);
 352
 353             if (s->seq_disp_ext == 1 || (s->seq_disp_ext == -1 && use_seq_disp_ext)) {
 354                 put_header(s, EXT_START_CODE);
 355                 put_bits(&s->pb, 4, 2);                         // sequence display extension
 356                 put_bits(&s->pb, 3, 0);                         // video_format: 0 is components
 357                 put_bits(&s->pb, 1, 1);                         // colour_description
 358                 put_bits(&s->pb, 8, s->avctx->color_primaries); // colour_primaries
 359                 put_bits(&s->pb, 8, s->avctx->color_trc);       // transfer_characteristics
 360                 put_bits(&s->pb, 8, s->avctx->colorspace);      // matrix_coefficients
 361                 put_bits(&s->pb, 14, width);                    // display_horizontal_size
 362                 put_bits(&s->pb, 1, 1);                         // marker_bit
 363                 put_bits(&s->pb, 14, height);                   // display_vertical_size
 364                 put_bits(&s->pb, 3, 0);                         // remaining 3 bits are zero padding
 365             }
 366         }
 367
 368         put_header(s, GOP_START_CODE);
 369         put_bits(&s->pb, 1, s->drop_frame_timecode);    // drop frame flag
 370         /* time code: we must convert from the real frame rate to a
 371          * fake MPEG frame rate in case of low frame rate */
 372         fps       = (framerate.num + framerate.den / 2) / framerate.den;
 373         time_code = s->current_picture_ptr->f->coded_picture_number +
 374                     s->avctx->timecode_frame_start;
 375
 376         s->gop_picture_number = s->current_picture_ptr->f->coded_picture_number;
 377
 378         av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));
 379         if (s->drop_frame_timecode)
 380             time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);
 381
 382         put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 383         put_bits(&s->pb, 6, (uint32_t)((time_code / (fps *   60)) % 60));
 384         put_bits(&s->pb, 1, 1);
 385         put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 386         put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 387         put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP) || s->intra_only || !s->gop_picture_number);
 388         put_bits(&s->pb, 1, 0);                     // broken link
 389     }
 390 }
 391
 392 static inline void encode_mb_skip_run(MpegEncContext *s, int run)
 393 {
 394     while (run >= 33) {
 395         put_bits(&s->pb, 11, 0x008);
 396         run -= 33;
 397     }
 398     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 399              ff_mpeg12_mbAddrIncrTable[run][0]);
 400 }
 401
 402 static av_always_inline void put_qscale(MpegEncContext *s)
 403 {
 404     if (s->q_scale_type) {
 405         av_assert2(s->qscale >= 1 && s->qscale <= 12);
 406         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 407     } else {
 408         put_bits(&s->pb, 5, s->qscale);
 409     }
 410 }
 411
 412 void ff_mpeg1_encode_slice_header(MpegEncContext *s)
 413 {
 414     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
 415         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 416         /* slice_vertical_position_extension */
 417         put_bits(&s->pb, 3, s->mb_y >> 7);
 418     } else {
 419         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 420     }
 421     put_qscale(s);
 422     /* slice extra information */
 423     put_bits(&s->pb, 1, 0);
 424 }
 425
 426 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 427 {
 428     AVFrameSideData *side_data;
 429     mpeg1_encode_sequence_header(s);
 430
 431     /* mpeg1 picture header */
 432     put_header(s, PICTURE_START_CODE);
 433     /* temporal reference */
 434
 435     // RAL: s->picture_number instead of s->fake_picture_number
 436     put_bits(&s->pb, 10,
 437              (s->picture_number - s->gop_picture_number) & 0x3ff);
 438     put_bits(&s->pb, 3, s->pict_type);
 439
 440     s->vbv_delay_ptr = s->pb.buf + put_bits_count(&s->pb) / 8;
 441     put_bits(&s->pb, 16, 0xFFFF);               /* vbv_delay */
 442
 443     // RAL: Forward f_code also needed for B-frames
 444     if (s->pict_type == AV_PICTURE_TYPE_P ||
 445         s->pict_type == AV_PICTURE_TYPE_B) {
 446         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 447         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 448             put_bits(&s->pb, 3, s->f_code);     /* forward_f_code */
 449         else
 450             put_bits(&s->pb, 3, 7);             /* forward_f_code */
 451     }
 452
 453     // RAL: Backward f_code necessary for B-frames
 454     if (s->pict_type == AV_PICTURE_TYPE_B) {
 455         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 456         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 457             put_bits(&s->pb, 3, s->b_code);     /* backward_f_code */
 458         else
 459             put_bits(&s->pb, 3, 7);             /* backward_f_code */
 460     }
 461
 462     put_bits(&s->pb, 1, 0);                     /* extra bit picture */
 463
 464     s->frame_pred_frame_dct = 1;
 465     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 466         put_header(s, EXT_START_CODE);
 467         put_bits(&s->pb, 4, 8);                 /* pic ext */
 468         if (s->pict_type == AV_PICTURE_TYPE_P ||
 469             s->pict_type == AV_PICTURE_TYPE_B) {
 470             put_bits(&s->pb, 4, s->f_code);
 471             put_bits(&s->pb, 4, s->f_code);
 472         } else {
 473             put_bits(&s->pb, 8, 255);
 474         }
 475         if (s->pict_type == AV_PICTURE_TYPE_B) {
 476             put_bits(&s->pb, 4, s->b_code);
 477             put_bits(&s->pb, 4, s->b_code);
 478         } else {
 479             put_bits(&s->pb, 8, 255);
 480         }
 481         put_bits(&s->pb, 2, s->intra_dc_precision);
 482
 483         av_assert0(s->picture_structure == PICT_FRAME);
 484         put_bits(&s->pb, 2, s->picture_structure);
 485         if (s->progressive_sequence)
 486             put_bits(&s->pb, 1, 0);             /* no repeat */
 487         else
 488             put_bits(&s->pb, 1, s->current_picture_ptr->f->top_field_first);
 489         /* XXX: optimize the generation of this flag with entropy measures */
 490         s->frame_pred_frame_dct = s->progressive_sequence;
 491
 492         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 493         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 494         put_bits(&s->pb, 1, s->q_scale_type);
 495         put_bits(&s->pb, 1, s->intra_vlc_format);
 496         put_bits(&s->pb, 1, s->alternate_scan);
 497         put_bits(&s->pb, 1, s->repeat_first_field);
 498         s->progressive_frame = s->progressive_sequence;
 499         /* chroma_420_type */
 500         put_bits(&s->pb, 1, s->chroma_format ==
 501                             CHROMA_420 ? s->progressive_frame : 0);
 502         put_bits(&s->pb, 1, s->progressive_frame);
 503         put_bits(&s->pb, 1, 0);                 /* composite_display_flag */
 504     }
 505     if (s->scan_offset) {
 506         int i;
 507
 508         put_header(s, USER_START_CODE);
 509         for (i = 0; i < sizeof(svcd_scan_offset_placeholder); i++)
 510             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 511     }
 512     side_data = av_frame_get_side_data(s->current_picture_ptr->f,
 513                                        AV_FRAME_DATA_STEREO3D);
 514     if (side_data) {
 515         AVStereo3D *stereo = (AVStereo3D *)side_data->data;
 516         uint8_t fpa_type;
 517
 518         switch (stereo->type) {
 519         case AV_STEREO3D_SIDEBYSIDE:
 520             fpa_type = 0x03;
 521             break;
 522         case AV_STEREO3D_TOPBOTTOM:
 523             fpa_type = 0x04;
 524             break;
 525         case AV_STEREO3D_2D:
 526             fpa_type = 0x08;
 527             break;
 528         case AV_STEREO3D_SIDEBYSIDE_QUINCUNX:
 529             fpa_type = 0x23;
 530             break;
 531         default:
 532             fpa_type = 0;
 533             break;
 534         }
 535
 536         if (fpa_type != 0) {
 537             put_header(s, USER_START_CODE);
 538             put_bits(&s->pb, 8, 'J');   // S3D_video_format_signaling_identifier
 539             put_bits(&s->pb, 8, 'P');
 540             put_bits(&s->pb, 8, '3');
 541             put_bits(&s->pb, 8, 'D');
 542             put_bits(&s->pb, 8, 0x03);  // S3D_video_format_length
 543
 544             put_bits(&s->pb, 1, 1);     // reserved_bit
 545             put_bits(&s->pb, 7, fpa_type); // S3D_video_format_type
 546             put_bits(&s->pb, 8, 0x04);  // reserved_data[0]
 547             put_bits(&s->pb, 8, 0xFF);  // reserved_data[1]
 548         }
 549     }
 550
 551     s->mb_y = 0;
 552     ff_mpeg1_encode_slice_header(s);
 553 }
 554
 555 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 556                                 int has_mv, int field_motion)
 557 {
 558     put_bits(&s->pb, n, bits);
 559     if (!s->frame_pred_frame_dct) {
 560         if (has_mv)
 561             /* motion_type: frame/field */
 562             put_bits(&s->pb, 2, 2 - field_motion);
 563         put_bits(&s->pb, 1, s->interlaced_dct);
 564     }
 565 }
 566
 567 // RAL: Parameter added: f_or_b_code
 568 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 569 {
 570     if (val == 0) {
 571         /* zero vector */
 572         put_bits(&s->pb,
 573                  ff_mpeg12_mbMotionVectorTable[0][1],
 574                  ff_mpeg12_mbMotionVectorTable[0][0]);
 575     } else {
 576         int code, sign, bits;
 577         int bit_size = f_or_b_code - 1;
 578         int range    = 1 << bit_size;
 579         /* modulo encoding */
 580         val = sign_extend(val, 5 + bit_size);
 581
 582         if (val >= 0) {
 583             val--;
 584             code = (val >> bit_size) + 1;
 585             bits = val & (range - 1);
 586             sign = 0;
 587         } else {
 588             val = -val;
 589             val--;
 590             code = (val >> bit_size) + 1;
 591             bits = val & (range - 1);
 592             sign = 1;
 593         }
 594
 595         av_assert2(code > 0 && code <= 16);
 596
 597         put_bits(&s->pb,
 598                  ff_mpeg12_mbMotionVectorTable[code][1],
 599                  ff_mpeg12_mbMotionVectorTable[code][0]);
 600
 601         put_bits(&s->pb, 1, sign);
 602         if (bit_size > 0)
 603             put_bits(&s->pb, bit_size, bits);
 604     }
 605 }
 606
 607 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 608 {
 609     if (((unsigned) (diff + 255)) >= 511) {
 610         int index;
 611
 612         if (diff < 0) {
 613             index = av_log2_16bit(-2 * diff);
 614             diff--;
 615         } else {
 616             index = av_log2_16bit(2 * diff);
 617         }
 618         if (component == 0)
 619             put_bits(&s->pb,
 620                      ff_mpeg12_vlc_dc_lum_bits[index] + index,
 621                      (ff_mpeg12_vlc_dc_lum_code[index] << index) +
 622                      (diff & ((1 << index) - 1)));
 623         else
 624             put_bits(&s->pb,
 625                      ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 626                      (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
 627                      (diff & ((1 << index) - 1)));
 628     } else {
 629         if (component == 0)
 630             put_bits(&s->pb,
 631                      mpeg1_lum_dc_uni[diff + 255] & 0xFF,
 632                      mpeg1_lum_dc_uni[diff + 255] >> 8);
 633         else
 634             put_bits(&s->pb,
 635                      mpeg1_chr_dc_uni[diff + 255] & 0xFF,
 636                      mpeg1_chr_dc_uni[diff + 255] >> 8);
 637     }
 638 }
 639
 640 static void mpeg1_encode_block(MpegEncContext *s, int16_t *block, int n)
 641 {
 642     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 643     int code, component;
 644     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 645
 646     last_index = s->block_last_index[n];
 647
 648     /* DC coef */
 649     if (s->mb_intra) {
 650         component = (n <= 3 ? 0 : (n & 1) + 1);
 651         dc        = block[0];                   /* overflow is impossible */
 652         diff      = dc - s->last_dc[component];
 653         encode_dc(s, diff, component);
 654         s->last_dc[component] = dc;
 655         i = 1;
 656         if (s->intra_vlc_format)
 657             table_vlc = ff_rl_mpeg2.table_vlc;
 658     } else {
 659         /* encode the first coefficient: needs to be done here because
 660          * it is handled slightly differently */
 661         level = block[0];
 662         if (abs(level) == 1) {
 663             code = ((uint32_t)level >> 31);     /* the sign bit */
 664             put_bits(&s->pb, 2, code | 0x02);
 665             i = 1;
 666         } else {
 667             i             = 0;
 668             last_non_zero = -1;
 669             goto next_coef;
 670         }
 671     }
 672
 673     /* now quantify & encode AC coefs */
 674     last_non_zero = i - 1;
 675
 676     for (; i <= last_index; i++) {
 677         j     = s->intra_scantable.permutated[i];
 678         level = block[j];
 679
 680 next_coef:
 681         /* encode using VLC */
 682         if (level != 0) {
 683             run = i - last_non_zero - 1;
 684
 685             alevel = level;
 686             MASK_ABS(sign, alevel);
 687             sign &= 1;
 688
 689             if (alevel <= mpeg1_max_level[0][run]) {
 690                 code = mpeg1_index_run[0][run] + alevel - 1;
 691                 /* store the VLC & sign at once */
 692                 put_bits(&s->pb, table_vlc[code][1] + 1,
 693                          (table_vlc[code][0] << 1) + sign);
 694             } else {
 695                 /* escape seems to be pretty rare <5% so I do not optimize it */
 696                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 697                 /* escape: only clip in this case */
 698                 put_bits(&s->pb, 6, run);
 699                 if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
 700                     if (alevel < 128) {
 701                         put_sbits(&s->pb, 8, level);
 702                     } else {
 703                         if (level < 0)
 704                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 705                         else
 706                             put_sbits(&s->pb, 16, level);
 707                     }
 708                 } else {
 709                     put_sbits(&s->pb, 12, level);
 710                 }
 711             }
 712             last_non_zero = i;
 713         }
 714     }
 715     /* end of block */
 716     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 717 }
 718
 719 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 720                                                       int16_t block[8][64],
 721                                                       int motion_x, int motion_y,
 722                                                       int mb_block_count)
 723 {
 724     int i, cbp;
 725     const int mb_x     = s->mb_x;
 726     const int mb_y     = s->mb_y;
 727     const int first_mb = mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 728
 729     /* compute cbp */
 730     cbp = 0;
 731     for (i = 0; i < mb_block_count; i++)
 732         if (s->block_last_index[i] >= 0)
 733             cbp |= 1 << (mb_block_count - 1 - i);
 734
 735     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 736         (mb_x != s->mb_width - 1 ||
 737          (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
 738         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 739          (s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir &&
 740           (((s->mv_dir & MV_DIR_FORWARD)
 741             ? ((s->mv[0][0][0] - s->last_mv[0][0][0]) |
 742                (s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
 743            ((s->mv_dir & MV_DIR_BACKWARD)
 744             ? ((s->mv[1][0][0] - s->last_mv[1][0][0]) |
 745                (s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
 746         s->mb_skip_run++;
 747         s->qscale -= s->dquant;
 748         s->skip_count++;
 749         s->misc_bits++;
 750         s->last_bits++;
 751         if (s->pict_type == AV_PICTURE_TYPE_P) {
 752             s->last_mv[0][0][0] =
 753             s->last_mv[0][0][1] =
 754             s->last_mv[0][1][0] =
 755             s->last_mv[0][1][1] = 0;
 756         }
 757     } else {
 758         if (first_mb) {
 759             av_assert0(s->mb_skip_run == 0);
 760             encode_mb_skip_run(s, s->mb_x);
 761         } else {
 762             encode_mb_skip_run(s, s->mb_skip_run);
 763         }
 764
 765         if (s->pict_type == AV_PICTURE_TYPE_I) {
 766             if (s->dquant && cbp) {
 767                 /* macroblock_type: macroblock_quant = 1 */
 768                 put_mb_modes(s, 2, 1, 0, 0);
 769                 put_qscale(s);
 770             } else {
 771                 /* macroblock_type: macroblock_quant = 0 */
 772                 put_mb_modes(s, 1, 1, 0, 0);
 773                 s->qscale -= s->dquant;
 774             }
 775             s->misc_bits += get_bits_diff(s);
 776             s->i_count++;
 777         } else if (s->mb_intra) {
 778             if (s->dquant && cbp) {
 779                 put_mb_modes(s, 6, 0x01, 0, 0);
 780                 put_qscale(s);
 781             } else {
 782                 put_mb_modes(s, 5, 0x03, 0, 0);
 783                 s->qscale -= s->dquant;
 784             }
 785             s->misc_bits += get_bits_diff(s);
 786             s->i_count++;
 787             memset(s->last_mv, 0, sizeof(s->last_mv));
 788         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 789             if (s->mv_type == MV_TYPE_16X16) {
 790                 if (cbp != 0) {
 791                     if ((motion_x | motion_y) == 0) {
 792                         if (s->dquant) {
 793                             /* macroblock_pattern & quant */
 794                             put_mb_modes(s, 5, 1, 0, 0);
 795                             put_qscale(s);
 796                         } else {
 797                             /* macroblock_pattern only */
 798                             put_mb_modes(s, 2, 1, 0, 0);
 799                         }
 800                         s->misc_bits += get_bits_diff(s);
 801                     } else {
 802                         if (s->dquant) {
 803                             put_mb_modes(s, 5, 2, 1, 0);    /* motion + cbp */
 804                             put_qscale(s);
 805                         } else {
 806                             put_mb_modes(s, 1, 1, 1, 0);    /* motion + cbp */
 807                         }
 808                         s->misc_bits += get_bits_diff(s);
 809                         // RAL: f_code parameter added
 810                         mpeg1_encode_motion(s,
 811                                             motion_x - s->last_mv[0][0][0],
 812                                             s->f_code);
 813                         // RAL: f_code parameter added
 814                         mpeg1_encode_motion(s,
 815                                             motion_y - s->last_mv[0][0][1],
 816                                             s->f_code);
 817                         s->mv_bits += get_bits_diff(s);
 818                     }
 819                 } else {
 820                     put_bits(&s->pb, 3, 1);         /* motion only */
 821                     if (!s->frame_pred_frame_dct)
 822                         put_bits(&s->pb, 2, 2);     /* motion_type: frame */
 823                     s->misc_bits += get_bits_diff(s);
 824                     // RAL: f_code parameter added
 825                     mpeg1_encode_motion(s,
 826                                         motion_x - s->last_mv[0][0][0],
 827                                         s->f_code);
 828                     // RAL: f_code parameter added
 829                     mpeg1_encode_motion(s,
 830                                         motion_y - s->last_mv[0][0][1],
 831                                         s->f_code);
 832                     s->qscale  -= s->dquant;
 833                     s->mv_bits += get_bits_diff(s);
 834                 }
 835                 s->last_mv[0][1][0] = s->last_mv[0][0][0] = motion_x;
 836                 s->last_mv[0][1][1] = s->last_mv[0][0][1] = motion_y;
 837             } else {
 838                 av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 839
 840                 if (cbp) {
 841                     if (s->dquant) {
 842                         put_mb_modes(s, 5, 2, 1, 1);    /* motion + cbp */
 843                         put_qscale(s);
 844                     } else {
 845                         put_mb_modes(s, 1, 1, 1, 1);    /* motion + cbp */
 846                     }
 847                 } else {
 848                     put_bits(&s->pb, 3, 1);             /* motion only */
 849                     put_bits(&s->pb, 2, 1);             /* motion_type: field */
 850                     s->qscale -= s->dquant;
 851                 }
 852                 s->misc_bits += get_bits_diff(s);
 853                 for (i = 0; i < 2; i++) {
 854                     put_bits(&s->pb, 1, s->field_select[0][i]);
 855                     mpeg1_encode_motion(s,
 856                                         s->mv[0][i][0] - s->last_mv[0][i][0],
 857                                         s->f_code);
 858                     mpeg1_encode_motion(s,
 859                                         s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 860                                         s->f_code);
 861                     s->last_mv[0][i][0] = s->mv[0][i][0];
 862                     s->last_mv[0][i][1] = 2 * s->mv[0][i][1];
 863                 }
 864                 s->mv_bits += get_bits_diff(s);
 865             }
 866             if (cbp) {
 867                 if (s->chroma_y_shift) {
 868                     put_bits(&s->pb,
 869                              ff_mpeg12_mbPatTable[cbp][1],
 870                              ff_mpeg12_mbPatTable[cbp][0]);
 871                 } else {
 872                     put_bits(&s->pb,
 873                              ff_mpeg12_mbPatTable[cbp >> 2][1],
 874                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
 875                     put_sbits(&s->pb, 2, cbp);
 876                 }
 877             }
 878             s->f_count++;
 879         } else {
 880             if (s->mv_type == MV_TYPE_16X16) {
 881                 if (cbp) {                      // With coded bloc pattern
 882                     if (s->dquant) {
 883                         if (s->mv_dir == MV_DIR_FORWARD)
 884                             put_mb_modes(s, 6, 3, 1, 0);
 885                         else
 886                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 0);
 887                         put_qscale(s);
 888                     } else {
 889                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 0);
 890                     }
 891                 } else {                        // No coded bloc pattern
 892                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 893                     if (!s->frame_pred_frame_dct)
 894                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 895                     s->qscale -= s->dquant;
 896                 }
 897                 s->misc_bits += get_bits_diff(s);
 898                 if (s->mv_dir & MV_DIR_FORWARD) {
 899                     mpeg1_encode_motion(s,
 900                                         s->mv[0][0][0] - s->last_mv[0][0][0],
 901                                         s->f_code);
 902                     mpeg1_encode_motion(s,
 903                                         s->mv[0][0][1] - s->last_mv[0][0][1],
 904                                         s->f_code);
 905                     s->last_mv[0][0][0] =
 906                     s->last_mv[0][1][0] = s->mv[0][0][0];
 907                     s->last_mv[0][0][1] =
 908                     s->last_mv[0][1][1] = s->mv[0][0][1];
 909                     s->f_count++;
 910                 }
 911                 if (s->mv_dir & MV_DIR_BACKWARD) {
 912                     mpeg1_encode_motion(s,
 913                                         s->mv[1][0][0] - s->last_mv[1][0][0],
 914                                         s->b_code);
 915                     mpeg1_encode_motion(s,
 916                                         s->mv[1][0][1] - s->last_mv[1][0][1],
 917                                         s->b_code);
 918                     s->last_mv[1][0][0] =
 919                     s->last_mv[1][1][0] = s->mv[1][0][0];
 920                     s->last_mv[1][0][1] =
 921                     s->last_mv[1][1][1] = s->mv[1][0][1];
 922                     s->b_count++;
 923                 }
 924             } else {
 925                 av_assert2(s->mv_type == MV_TYPE_FIELD);
 926                 av_assert2(!s->frame_pred_frame_dct);
 927                 if (cbp) {                      // With coded bloc pattern
 928                     if (s->dquant) {
 929                         if (s->mv_dir == MV_DIR_FORWARD)
 930                             put_mb_modes(s, 6, 3, 1, 1);
 931                         else
 932                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 1);
 933                         put_qscale(s);
 934                     } else {
 935                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 1);
 936                     }
 937                 } else {                        // No coded bloc pattern
 938                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 939                     put_bits(&s->pb, 2, 1);     /* motion_type: field */
 940                     s->qscale -= s->dquant;
 941                 }
 942                 s->misc_bits += get_bits_diff(s);
 943                 if (s->mv_dir & MV_DIR_FORWARD) {
 944                     for (i = 0; i < 2; i++) {
 945                         put_bits(&s->pb, 1, s->field_select[0][i]);
 946                         mpeg1_encode_motion(s,
 947                                             s->mv[0][i][0] - s->last_mv[0][i][0],
 948                                             s->f_code);
 949                         mpeg1_encode_motion(s,
 950                                             s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 951                                             s->f_code);
 952                         s->last_mv[0][i][0] = s->mv[0][i][0];
 953                         s->last_mv[0][i][1] = s->mv[0][i][1] * 2;
 954                     }
 955                     s->f_count++;
 956                 }
 957                 if (s->mv_dir & MV_DIR_BACKWARD) {
 958                     for (i = 0; i < 2; i++) {
 959                         put_bits(&s->pb, 1, s->field_select[1][i]);
 960                         mpeg1_encode_motion(s,
 961                                             s->mv[1][i][0] - s->last_mv[1][i][0],
 962                                             s->b_code);
 963                         mpeg1_encode_motion(s,
 964                                             s->mv[1][i][1] - (s->last_mv[1][i][1] >> 1),
 965                                             s->b_code);
 966                         s->last_mv[1][i][0] = s->mv[1][i][0];
 967                         s->last_mv[1][i][1] = s->mv[1][i][1] * 2;
 968                     }
 969                     s->b_count++;
 970                 }
 971             }
 972             s->mv_bits += get_bits_diff(s);
 973             if (cbp) {
 974                 if (s->chroma_y_shift) {
 975                     put_bits(&s->pb,
 976                              ff_mpeg12_mbPatTable[cbp][1],
 977                              ff_mpeg12_mbPatTable[cbp][0]);
 978                 } else {
 979                     put_bits(&s->pb,
 980                              ff_mpeg12_mbPatTable[cbp >> 2][1],
 981                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
 982                     put_sbits(&s->pb, 2, cbp);
 983                 }
 984             }
 985         }
 986         for (i = 0; i < mb_block_count; i++)
 987             if (cbp & (1 << (mb_block_count - 1 - i)))
 988                 mpeg1_encode_block(s, block[i], i);
 989         s->mb_skip_run = 0;
 990         if (s->mb_intra)
 991             s->i_tex_bits += get_bits_diff(s);
 992         else
 993             s->p_tex_bits += get_bits_diff(s);
 994     }
 995 }
 996
 997 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
 998                         int motion_x, int motion_y)
 999 {
1000     if (s->chroma_format == CHROMA_420)
1001         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
1002     else
1003         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
1004 }
1005
1006 av_cold void ff_mpeg1_encode_init(MpegEncContext *s)
1007 {
1008     static int done = 0;
1009
1010     ff_mpeg12_common_init(s);
1011
1012     if (!done) {
1013         int f_code;
1014         int mv;
1015         int i;
1016
1017         done = 1;
1018         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
1019         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
1020
1021         for (i = 0; i < 64; i++) {
1022             mpeg1_max_level[0][i] = ff_rl_mpeg1.max_level[0][i];
1023             mpeg1_index_run[0][i] = ff_rl_mpeg1.index_run[0][i];
1024         }
1025
1026         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
1027         if (s->intra_vlc_format)
1028             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
1029
1030         /* build unified dc encoding tables */
1031         for (i = -255; i < 256; i++) {
1032             int adiff, index;
1033             int bits, code;
1034             int diff = i;
1035
1036             adiff = FFABS(diff);
1037             if (diff < 0)
1038                 diff--;
1039             index = av_log2(2 * adiff);
1040
1041             bits = ff_mpeg12_vlc_dc_lum_bits[index] + index;
1042             code = (ff_mpeg12_vlc_dc_lum_code[index] << index) +
1043                    (diff & ((1 << index) - 1));
1044             mpeg1_lum_dc_uni[i + 255] = bits + (code << 8);
1045
1046             bits = ff_mpeg12_vlc_dc_chroma_bits[index] + index;
1047             code = (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
1048                    (diff & ((1 << index) - 1));
1049             mpeg1_chr_dc_uni[i + 255] = bits + (code << 8);
1050         }
1051
1052         for (f_code = 1; f_code <= MAX_FCODE; f_code++)
1053             for (mv = -MAX_MV; mv <= MAX_MV; mv++) {
1054                 int len;
1055
1056                 if (mv == 0) {
1057                     len = ff_mpeg12_mbMotionVectorTable[0][1];
1058                 } else {
1059                     int val, bit_size, code;
1060
1061                     bit_size = f_code - 1;
1062
1063                     val = mv;
1064                     if (val < 0)
1065                         val = -val;
1066                     val--;
1067                     code = (val >> bit_size) + 1;
1068                     if (code < 17)
1069                         len = ff_mpeg12_mbMotionVectorTable[code][1] +
1070                               1 + bit_size;
1071                     else
1072                         len = ff_mpeg12_mbMotionVectorTable[16][1] +
1073                               2 + bit_size;
1074                 }
1075
1076                 mv_penalty[f_code][mv + MAX_MV] = len;
1077             }
1078
1079
1080         for (f_code = MAX_FCODE; f_code > 0; f_code--)
1081             for (mv = -(8 << f_code); mv < (8 << f_code); mv++)
1082                 fcode_tab[mv + MAX_MV] = f_code;
1083     }
1084     s->me.mv_penalty = mv_penalty;
1085     s->fcode_tab     = fcode_tab;
1086     if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1087         s->min_qcoeff = -255;
1088         s->max_qcoeff = 255;
1089     } else {
1090         s->min_qcoeff = -2047;
1091         s->max_qcoeff = 2047;
1092     }
1093     if (s->intra_vlc_format) {
1094         s->intra_ac_vlc_length      =
1095         s->intra_ac_vlc_last_length = uni_mpeg2_ac_vlc_len;
1096     } else {
1097         s->intra_ac_vlc_length      =
1098         s->intra_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1099     }
1100     s->inter_ac_vlc_length      =
1101     s->inter_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1102 }
1103
1104 #define OFFSET(x) offsetof(MpegEncContext, x)
1105 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
1106 #define COMMON_OPTS                                                           \
1107     { "gop_timecode",        "MPEG GOP Timecode in hh:mm:ss[:;.]ff format",   \
1108       OFFSET(tc_opt_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, VE },\
1109     { "intra_vlc",           "Use MPEG-2 intra VLC table.",                   \
1110       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE }, \
1111     { "drop_frame_timecode", "Timecode is in drop frame format.",             \
1112       OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE }, \
1113     { "scan_offset",         "Reserve space for SVCD scan offset user data.", \
1114       OFFSET(scan_offset),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1115
1116 static const AVOption mpeg1_options[] = {
1117     COMMON_OPTS
1118     FF_MPV_COMMON_OPTS
1119     { NULL },
1120 };
1121
1122 static const AVOption mpeg2_options[] = {
1123     COMMON_OPTS
1124     { "non_linear_quant", "Use nonlinear quantizer.",    OFFSET(q_scale_type),   AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1125     { "alternate_scan",   "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1126     { "seq_disp_ext",     "Write sequence_display_extension blocks.", OFFSET(seq_disp_ext), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE, "seq_disp_ext" },
1127     {     "auto",   NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = -1},  0, 0, VE, "seq_disp_ext" },
1128     {     "never",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 0 },  0, 0, VE, "seq_disp_ext" },
1129     {     "always", NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 1 },  0, 0, VE, "seq_disp_ext" },
1130     FF_MPV_COMMON_OPTS
1131     { NULL },
1132 };
1133
1134 #define mpeg12_class(x)                                 \
1135 static const AVClass mpeg ## x ## _class = {            \
1136     .class_name = "mpeg" # x "video encoder",           \
1137     .item_name  = av_default_item_name,                 \
1138     .option     = mpeg ## x ## _options,                \
1139     .version    = LIBAVUTIL_VERSION_INT,                \
1140 };
1141
1142 mpeg12_class(1)
1143 mpeg12_class(2)
1144
1145 AVCodec ff_mpeg1video_encoder = {
1146     .name                 = "mpeg1video",
1147     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
1148     .type                 = AVMEDIA_TYPE_VIDEO,
1149     .id                   = AV_CODEC_ID_MPEG1VIDEO,
1150     .priv_data_size       = sizeof(MpegEncContext),
1151     .init                 = encode_init,
1152     .encode2              = ff_mpv_encode_picture,
1153     .close                = ff_mpv_encode_end,
1154     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
1155     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1156                                                            AV_PIX_FMT_NONE },
1157     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1158     .priv_class           = &mpeg1_class,
1159 };
1160
1161 AVCodec ff_mpeg2video_encoder = {
1162     .name                 = "mpeg2video",
1163     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1164     .type                 = AVMEDIA_TYPE_VIDEO,
1165     .id                   = AV_CODEC_ID_MPEG2VIDEO,
1166     .priv_data_size       = sizeof(MpegEncContext),
1167     .init                 = encode_init,
1168     .encode2              = ff_mpv_encode_picture,
1169     .close                = ff_mpv_encode_end,
1170     .supported_framerates = ff_mpeg2_frame_rate_tab,
1171     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1172                                                            AV_PIX_FMT_YUV422P,
1173                                                            AV_PIX_FMT_NONE },
1174     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1175     .priv_class           = &mpeg2_class,
1176 };