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   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 "libavutil/attributes.h"
  29 #include "libavutil/avassert.h"
  30 #include "libavutil/log.h"
  31 #include "libavutil/opt.h"
  32 #include "libavutil/timecode.h"
  33 #include "avcodec.h"
  34 #include "bytestream.h"
  35 #include "mathops.h"
  36 #include "mpeg12.h"
  37 #include "mpeg12data.h"
  38 #include "mpegvideo.h"
  39
  40
  41 static const uint8_t inv_non_linear_qscale[] = {
  42     0, 2, 4, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16,
  43 };
  44
  45 static const uint8_t svcd_scan_offset_placeholder[] = {
  46     0x10, 0x0E, 0x00, 0x80, 0x81, 0x00, 0x80,
  47     0x81, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  48 };
  49
  50 static uint8_t mv_penalty[MAX_FCODE + 1][MAX_MV * 2 + 1];
  51 static uint8_t fcode_tab[MAX_MV * 2 + 1];
  52
  53 static uint8_t uni_mpeg1_ac_vlc_len[64 * 64 * 2];
  54 static uint8_t uni_mpeg2_ac_vlc_len[64 * 64 * 2];
  55
  56 /* simple include everything table for dc, first byte is bits
  57  * number next 3 are code */
  58 static uint32_t mpeg1_lum_dc_uni[512];
  59 static uint32_t mpeg1_chr_dc_uni[512];
  60
  61 static uint8_t mpeg1_index_run[2][64];
  62 static int8_t  mpeg1_max_level[2][64];
  63
  64 static av_cold void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len)
  65 {
  66     int i;
  67
  68     for (i = 0; i < 128; i++) {
  69         int level = i - 64;
  70         int run;
  71         if (!level)
  72             continue;
  73         for (run = 0; run < 64; run++) {
  74             int len, code;
  75             int alevel = FFABS(level);
  76
  77             if (alevel > rl->max_level[0][run])
  78                 code = 111;                         /* rl->n */
  79             else
  80                 code = rl->index_run[0][run] + alevel - 1;
  81
  82             if (code < 111) {                       /* rl->n */
  83                 /* length of VLC and sign */
  84                 len = rl->table_vlc[code][1] + 1;
  85             } else {
  86                 len = rl->table_vlc[111 /* rl->n */][1] + 6;
  87
  88                 if (alevel < 128)
  89                     len += 8;
  90                 else
  91                     len += 16;
  92             }
  93
  94             uni_ac_vlc_len[UNI_AC_ENC_INDEX(run, i)] = len;
  95         }
  96     }
  97 }
  98
  99 static int find_frame_rate_index(MpegEncContext *s)
 100 {
 101     int i;
 102     AVRational bestq = (AVRational) {0, 0};
 103     AVRational ext;
 104     AVRational target = av_inv_q(s->avctx->time_base);
 105
 106     for (i = 1; i < 14; i++) {
 107         if (s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL &&
 108             i >= 9)
 109             break;
 110
 111         for (ext.num=1; ext.num <= 4; ext.num++) {
 112             for (ext.den=1; ext.den <= 32; ext.den++) {
 113                 AVRational q = av_mul_q(ext, ff_mpeg12_frame_rate_tab[i]);
 114
 115                 if (s->codec_id != AV_CODEC_ID_MPEG2VIDEO && (ext.den!=1 || ext.num!=1))
 116                     continue;
 117                 if (av_gcd(ext.den, ext.num) != 1)
 118                     continue;
 119
 120                 if (    bestq.num==0
 121                     || av_nearer_q(target, bestq, q) < 0
 122                     || ext.num==1 && ext.den==1 && av_nearer_q(target, bestq, q) == 0) {
 123                     bestq               = q;
 124                     s->frame_rate_index = i;
 125                     s->mpeg2_frame_rate_ext.num = ext.num;
 126                     s->mpeg2_frame_rate_ext.den = ext.den;
 127                 }
 128             }
 129         }
 130     }
 131
 132     if (av_cmp_q(target, bestq))
 133         return -1;
 134     else
 135         return 0;
 136 }
 137
 138 static av_cold int encode_init(AVCodecContext *avctx)
 139 {
 140     MpegEncContext *s = avctx->priv_data;
 141
 142     if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && avctx->height > 2800)
 143         avctx->thread_count = 1;
 144
 145     if (ff_MPV_encode_init(avctx) < 0)
 146         return -1;
 147
 148     if (find_frame_rate_index(s) < 0) {
 149         if (s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
 150             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n",
 151                    avctx->time_base.den, avctx->time_base.num);
 152             return -1;
 153         } else {
 154             av_log(avctx, AV_LOG_INFO,
 155                    "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n",
 156                    avctx->time_base.den, avctx->time_base.num);
 157         }
 158     }
 159
 160     if (avctx->profile == FF_PROFILE_UNKNOWN) {
 161         if (avctx->level != FF_LEVEL_UNKNOWN) {
 162             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 163             return -1;
 164         }
 165         /* Main or 4:2:2 */
 166         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0;
 167     }
 168
 169     if (avctx->level == FF_LEVEL_UNKNOWN) {
 170         if (avctx->profile == 0) {                  /* 4:2:2 */
 171             if (avctx->width <= 720 && avctx->height <= 608)
 172                 avctx->level = 5;                   /* Main */
 173             else
 174                 avctx->level = 2;                   /* High */
 175         } else {
 176             if (avctx->profile != 1 && s->chroma_format != CHROMA_420) {
 177                 av_log(avctx, AV_LOG_ERROR,
 178                        "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 179                 return -1;
 180             }
 181             if (avctx->width <= 720 && avctx->height <= 576)
 182                 avctx->level = 8;                   /* Main */
 183             else if (avctx->width <= 1440)
 184                 avctx->level = 6;                   /* High 1440 */
 185             else
 186                 avctx->level = 4;                   /* High */
 187         }
 188     }
 189
 190     if ((avctx->width & 0xFFF) == 0 && (avctx->height & 0xFFF) == 1) {
 191         av_log(avctx, AV_LOG_ERROR, "Width / Height is invalid for MPEG2\n");
 192         return AVERROR(EINVAL);
 193     }
 194
 195     if (s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
 196         if ((avctx->width & 0xFFF) == 0 || (avctx->height & 0xFFF) == 0) {
 197             av_log(avctx, AV_LOG_ERROR, "Width or Height are not allowed to be multiplies of 4096\n"
 198                                         "add '-strict %d' if you want to use them anyway.\n", FF_COMPLIANCE_UNOFFICIAL);
 199             return AVERROR(EINVAL);
 200         }
 201     }
 202
 203     s->drop_frame_timecode = s->drop_frame_timecode || !!(avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE);
 204     if (s->drop_frame_timecode)
 205         s->tc.flags |= AV_TIMECODE_FLAG_DROPFRAME;
 206     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 207         av_log(avctx, AV_LOG_ERROR,
 208                "Drop frame time code only allowed with 1001/30000 fps\n");
 209         return -1;
 210     }
 211
 212     if (s->tc_opt_str) {
 213         AVRational rate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 214         int ret = av_timecode_init_from_string(&s->tc, rate, s->tc_opt_str, s);
 215         if (ret < 0)
 216             return ret;
 217         s->drop_frame_timecode = !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME);
 218         s->avctx->timecode_frame_start = s->tc.start;
 219     } else {
 220         s->avctx->timecode_frame_start = 0; // default is -1
 221     }
 222     return 0;
 223 }
 224
 225 static void put_header(MpegEncContext *s, int header)
 226 {
 227     avpriv_align_put_bits(&s->pb);
 228     put_bits(&s->pb, 16, header >> 16);
 229     put_sbits(&s->pb, 16, header);
 230 }
 231
 232 /* put sequence header if needed */
 233 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 234 {
 235     unsigned int vbv_buffer_size, fps, v;
 236     int i, constraint_parameter_flag;
 237     uint64_t time_code;
 238     float best_aspect_error = 1E10;
 239     float aspect_ratio      = av_q2d(s->avctx->sample_aspect_ratio);
 240
 241     if (aspect_ratio == 0.0)
 242         aspect_ratio = 1.0;             // pixel aspect 1.1 (VGA)
 243
 244     if (s->current_picture.f.key_frame) {
 245         AVRational framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 246
 247         /* mpeg1 header repeated every gop */
 248         put_header(s, SEQ_START_CODE);
 249
 250         put_sbits(&s->pb, 12, s->width  & 0xFFF);
 251         put_sbits(&s->pb, 12, s->height & 0xFFF);
 252
 253         for (i = 1; i < 15; i++) {
 254             float error = aspect_ratio;
 255             if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <= 1)
 256                 error -= 1.0 / ff_mpeg1_aspect[i];
 257             else
 258                 error -= av_q2d(ff_mpeg2_aspect[i]) * s->height / s->width;
 259
 260             error = FFABS(error);
 261
 262             if (error < best_aspect_error) {
 263                 best_aspect_error    = error;
 264                 s->aspect_ratio_info = i;
 265             }
 266         }
 267
 268         put_bits(&s->pb, 4, s->aspect_ratio_info);
 269         put_bits(&s->pb, 4, s->frame_rate_index);
 270
 271         if (s->avctx->rc_max_rate) {
 272             v = (s->avctx->rc_max_rate + 399) / 400;
 273             if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 274                 v = 0x3ffff;
 275         } else {
 276             v = 0x3FFFF;
 277         }
 278
 279         if (s->avctx->rc_buffer_size)
 280             vbv_buffer_size = s->avctx->rc_buffer_size;
 281         else
 282             /* VBV calculation: Scaled so that a VCD has the proper
 283              * VBV size of 40 kilobytes */
 284             vbv_buffer_size = ((20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 285         vbv_buffer_size = (vbv_buffer_size + 16383) / 16384;
 286
 287         put_sbits(&s->pb, 18, v);
 288         put_bits(&s->pb, 1, 1);         // marker
 289         put_sbits(&s->pb, 10, vbv_buffer_size);
 290
 291         constraint_parameter_flag =
 292             s->width  <= 768                                    &&
 293             s->height <= 576                                    &&
 294             s->mb_width * s->mb_height                 <= 396   &&
 295             s->mb_width * s->mb_height * framerate.num <= 396 * 25 * framerate.den &&
 296             framerate.num <= framerate.den * 30                 &&
 297             s->avctx->me_range                                  &&
 298             s->avctx->me_range < 128                            &&
 299             vbv_buffer_size <= 20                               &&
 300             v <= 1856000 / 400                                  &&
 301             s->codec_id == AV_CODEC_ID_MPEG1VIDEO;
 302
 303         put_bits(&s->pb, 1, constraint_parameter_flag);
 304
 305         ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 306         ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 307
 308         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 309             put_header(s, EXT_START_CODE);
 310             put_bits(&s->pb, 4, 1);                 // seq ext
 311
 312             put_bits(&s->pb, 1, s->avctx->profile == 0); // escx 1 for 4:2:2 profile
 313
 314             put_bits(&s->pb, 3, s->avctx->profile); // profile
 315             put_bits(&s->pb, 4, s->avctx->level);   // level
 316
 317             put_bits(&s->pb, 1, s->progressive_sequence);
 318             put_bits(&s->pb, 2, s->chroma_format);
 319             put_bits(&s->pb, 2, s->width  >> 12);
 320             put_bits(&s->pb, 2, s->height >> 12);
 321             put_bits(&s->pb, 12, v >> 18);          // bitrate ext
 322             put_bits(&s->pb, 1, 1);                 // marker
 323             put_bits(&s->pb, 8, vbv_buffer_size >> 10); // vbv buffer ext
 324             put_bits(&s->pb, 1, s->low_delay);
 325             put_bits(&s->pb, 2, s->mpeg2_frame_rate_ext.num-1); // frame_rate_ext_n
 326             put_bits(&s->pb, 5, s->mpeg2_frame_rate_ext.den-1); // frame_rate_ext_d
 327         }
 328
 329         put_header(s, GOP_START_CODE);
 330         put_bits(&s->pb, 1, s->drop_frame_timecode);    // drop frame flag
 331         /* time code: we must convert from the real frame rate to a
 332          * fake MPEG frame rate in case of low frame rate */
 333         fps       = (framerate.num + framerate.den / 2) / framerate.den;
 334         time_code = s->current_picture_ptr->f.coded_picture_number +
 335                     s->avctx->timecode_frame_start;
 336
 337         s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 338
 339         av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));
 340         if (s->drop_frame_timecode)
 341             time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);
 342
 343         put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 344         put_bits(&s->pb, 6, (uint32_t)((time_code / (fps *   60)) % 60));
 345         put_bits(&s->pb, 1, 1);
 346         put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 347         put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 348         put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 349         put_bits(&s->pb, 1, 0);                     // broken link
 350     }
 351 }
 352
 353 static inline void encode_mb_skip_run(MpegEncContext *s, int run)
 354 {
 355     while (run >= 33) {
 356         put_bits(&s->pb, 11, 0x008);
 357         run -= 33;
 358     }
 359     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 360              ff_mpeg12_mbAddrIncrTable[run][0]);
 361 }
 362
 363 static av_always_inline void put_qscale(MpegEncContext *s)
 364 {
 365     if (s->q_scale_type) {
 366         av_assert2(s->qscale >= 1 && s->qscale <= 12);
 367         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 368     } else {
 369         put_bits(&s->pb, 5, s->qscale);
 370     }
 371 }
 372
 373 void ff_mpeg1_encode_slice_header(MpegEncContext *s)
 374 {
 375     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
 376         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 377         /* slice_vertical_position_extension */
 378         put_bits(&s->pb, 3, s->mb_y >> 7);
 379     } else {
 380         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 381     }
 382     put_qscale(s);
 383     /* slice extra information */
 384     put_bits(&s->pb, 1, 0);
 385 }
 386
 387 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 388 {
 389     mpeg1_encode_sequence_header(s);
 390
 391     /* mpeg1 picture header */
 392     put_header(s, PICTURE_START_CODE);
 393     /* temporal reference */
 394
 395     // RAL: s->picture_number instead of s->fake_picture_number
 396     put_bits(&s->pb, 10,
 397              (s->picture_number - s->gop_picture_number) & 0x3ff);
 398     put_bits(&s->pb, 3, s->pict_type);
 399
 400     s->vbv_delay_ptr = s->pb.buf + put_bits_count(&s->pb) / 8;
 401     put_bits(&s->pb, 16, 0xFFFF);               /* vbv_delay */
 402
 403     // RAL: Forward f_code also needed for B-frames
 404     if (s->pict_type == AV_PICTURE_TYPE_P ||
 405         s->pict_type == AV_PICTURE_TYPE_B) {
 406         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 407         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 408             put_bits(&s->pb, 3, s->f_code);     /* forward_f_code */
 409         else
 410             put_bits(&s->pb, 3, 7);             /* forward_f_code */
 411     }
 412
 413     // RAL: Backward f_code necessary for B-frames
 414     if (s->pict_type == AV_PICTURE_TYPE_B) {
 415         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 416         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 417             put_bits(&s->pb, 3, s->b_code);     /* backward_f_code */
 418         else
 419             put_bits(&s->pb, 3, 7);             /* backward_f_code */
 420     }
 421
 422     put_bits(&s->pb, 1, 0);                     /* extra bit picture */
 423
 424     s->frame_pred_frame_dct = 1;
 425     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 426         put_header(s, EXT_START_CODE);
 427         put_bits(&s->pb, 4, 8);                 /* pic ext */
 428         if (s->pict_type == AV_PICTURE_TYPE_P ||
 429             s->pict_type == AV_PICTURE_TYPE_B) {
 430             put_bits(&s->pb, 4, s->f_code);
 431             put_bits(&s->pb, 4, s->f_code);
 432         } else {
 433             put_bits(&s->pb, 8, 255);
 434         }
 435         if (s->pict_type == AV_PICTURE_TYPE_B) {
 436             put_bits(&s->pb, 4, s->b_code);
 437             put_bits(&s->pb, 4, s->b_code);
 438         } else {
 439             put_bits(&s->pb, 8, 255);
 440         }
 441         put_bits(&s->pb, 2, s->intra_dc_precision);
 442
 443         av_assert0(s->picture_structure == PICT_FRAME);
 444         put_bits(&s->pb, 2, s->picture_structure);
 445         if (s->progressive_sequence)
 446             put_bits(&s->pb, 1, 0);             /* no repeat */
 447         else
 448             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 449         /* XXX: optimize the generation of this flag with entropy measures */
 450         s->frame_pred_frame_dct = s->progressive_sequence;
 451
 452         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 453         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 454         put_bits(&s->pb, 1, s->q_scale_type);
 455         put_bits(&s->pb, 1, s->intra_vlc_format);
 456         put_bits(&s->pb, 1, s->alternate_scan);
 457         put_bits(&s->pb, 1, s->repeat_first_field);
 458         s->progressive_frame = s->progressive_sequence;
 459         /* chroma_420_type */
 460         put_bits(&s->pb, 1, s->chroma_format ==
 461                             CHROMA_420 ? s->progressive_frame : 0);
 462         put_bits(&s->pb, 1, s->progressive_frame);
 463         put_bits(&s->pb, 1, 0);                 /* composite_display_flag */
 464     }
 465     if (s->scan_offset) {
 466         int i;
 467
 468         put_header(s, USER_START_CODE);
 469         for (i = 0; i < sizeof(svcd_scan_offset_placeholder); i++)
 470             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 471     }
 472
 473     s->mb_y = 0;
 474     ff_mpeg1_encode_slice_header(s);
 475 }
 476
 477 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 478                                 int has_mv, int field_motion)
 479 {
 480     put_bits(&s->pb, n, bits);
 481     if (!s->frame_pred_frame_dct) {
 482         if (has_mv)
 483             /* motion_type: frame/field */
 484             put_bits(&s->pb, 2, 2 - field_motion);
 485         put_bits(&s->pb, 1, s->interlaced_dct);
 486     }
 487 }
 488
 489 // RAL: Parameter added: f_or_b_code
 490 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 491 {
 492     if (val == 0) {
 493         /* zero vector */
 494         put_bits(&s->pb,
 495                  ff_mpeg12_mbMotionVectorTable[0][1],
 496                  ff_mpeg12_mbMotionVectorTable[0][0]);
 497     } else {
 498         int code, sign, bits;
 499         int bit_size = f_or_b_code - 1;
 500         int range    = 1 << bit_size;
 501         /* modulo encoding */
 502         val = sign_extend(val, 5 + bit_size);
 503
 504         if (val >= 0) {
 505             val--;
 506             code = (val >> bit_size) + 1;
 507             bits = val & (range - 1);
 508             sign = 0;
 509         } else {
 510             val = -val;
 511             val--;
 512             code = (val >> bit_size) + 1;
 513             bits = val & (range - 1);
 514             sign = 1;
 515         }
 516
 517         av_assert2(code > 0 && code <= 16);
 518
 519         put_bits(&s->pb,
 520                  ff_mpeg12_mbMotionVectorTable[code][1],
 521                  ff_mpeg12_mbMotionVectorTable[code][0]);
 522
 523         put_bits(&s->pb, 1, sign);
 524         if (bit_size > 0)
 525             put_bits(&s->pb, bit_size, bits);
 526     }
 527 }
 528
 529 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 530 {
 531     if (((unsigned) (diff + 255)) >= 511) {
 532         int index;
 533
 534         if (diff < 0) {
 535             index = av_log2_16bit(-2 * diff);
 536             diff--;
 537         } else {
 538             index = av_log2_16bit(2 * diff);
 539         }
 540         if (component == 0)
 541             put_bits(&s->pb,
 542                      ff_mpeg12_vlc_dc_lum_bits[index] + index,
 543                      (ff_mpeg12_vlc_dc_lum_code[index] << index) +
 544                      (diff & ((1 << index) - 1)));
 545         else
 546             put_bits(&s->pb,
 547                      ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 548                      (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
 549                      (diff & ((1 << index) - 1)));
 550     } else {
 551         if (component == 0)
 552             put_bits(&s->pb,
 553                      mpeg1_lum_dc_uni[diff + 255] & 0xFF,
 554                      mpeg1_lum_dc_uni[diff + 255] >> 8);
 555         else
 556             put_bits(&s->pb,
 557                      mpeg1_chr_dc_uni[diff + 255] & 0xFF,
 558                      mpeg1_chr_dc_uni[diff + 255] >> 8);
 559     }
 560 }
 561
 562 static void mpeg1_encode_block(MpegEncContext *s, int16_t *block, int n)
 563 {
 564     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 565     int code, component;
 566     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 567
 568     last_index = s->block_last_index[n];
 569
 570     /* DC coef */
 571     if (s->mb_intra) {
 572         component = (n <= 3 ? 0 : (n & 1) + 1);
 573         dc        = block[0];                   /* overflow is impossible */
 574         diff      = dc - s->last_dc[component];
 575         encode_dc(s, diff, component);
 576         s->last_dc[component] = dc;
 577         i = 1;
 578         if (s->intra_vlc_format)
 579             table_vlc = ff_rl_mpeg2.table_vlc;
 580     } else {
 581         /* encode the first coefficient: needs to be done here because
 582          * it is handled slightly differently */
 583         level = block[0];
 584         if (abs(level) == 1) {
 585             code = ((uint32_t)level >> 31);     /* the sign bit */
 586             put_bits(&s->pb, 2, code | 0x02);
 587             i = 1;
 588         } else {
 589             i             = 0;
 590             last_non_zero = -1;
 591             goto next_coef;
 592         }
 593     }
 594
 595     /* now quantify & encode AC coefs */
 596     last_non_zero = i - 1;
 597
 598     for (; i <= last_index; i++) {
 599         j     = s->intra_scantable.permutated[i];
 600         level = block[j];
 601
 602 next_coef:
 603         /* encode using VLC */
 604         if (level != 0) {
 605             run = i - last_non_zero - 1;
 606
 607             alevel = level;
 608             MASK_ABS(sign, alevel);
 609             sign &= 1;
 610
 611             if (alevel <= mpeg1_max_level[0][run]) {
 612                 code = mpeg1_index_run[0][run] + alevel - 1;
 613                 /* store the VLC & sign at once */
 614                 put_bits(&s->pb, table_vlc[code][1] + 1,
 615                          (table_vlc[code][0] << 1) + sign);
 616             } else {
 617                 /* escape seems to be pretty rare <5% so I do not optimize it */
 618                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 619                 /* escape: only clip in this case */
 620                 put_bits(&s->pb, 6, run);
 621                 if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
 622                     if (alevel < 128) {
 623                         put_sbits(&s->pb, 8, level);
 624                     } else {
 625                         if (level < 0)
 626                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 627                         else
 628                             put_sbits(&s->pb, 16, level);
 629                     }
 630                 } else {
 631                     put_sbits(&s->pb, 12, level);
 632                 }
 633             }
 634             last_non_zero = i;
 635         }
 636     }
 637     /* end of block */
 638     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 639 }
 640
 641 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 642                                                       int16_t block[6][64],
 643                                                       int motion_x, int motion_y,
 644                                                       int mb_block_count)
 645 {
 646     int i, cbp;
 647     const int mb_x     = s->mb_x;
 648     const int mb_y     = s->mb_y;
 649     const int first_mb = mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 650
 651     /* compute cbp */
 652     cbp = 0;
 653     for (i = 0; i < mb_block_count; i++)
 654         if (s->block_last_index[i] >= 0)
 655             cbp |= 1 << (mb_block_count - 1 - i);
 656
 657     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 658         (mb_x != s->mb_width - 1 ||
 659          (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
 660         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 661          (s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir &&
 662           (((s->mv_dir & MV_DIR_FORWARD)
 663             ? ((s->mv[0][0][0] - s->last_mv[0][0][0]) |
 664                (s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
 665            ((s->mv_dir & MV_DIR_BACKWARD)
 666             ? ((s->mv[1][0][0] - s->last_mv[1][0][0]) |
 667                (s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
 668         s->mb_skip_run++;
 669         s->qscale -= s->dquant;
 670         s->skip_count++;
 671         s->misc_bits++;
 672         s->last_bits++;
 673         if (s->pict_type == AV_PICTURE_TYPE_P) {
 674             s->last_mv[0][0][0] =
 675             s->last_mv[0][0][1] =
 676             s->last_mv[0][1][0] =
 677             s->last_mv[0][1][1] = 0;
 678         }
 679     } else {
 680         if (first_mb) {
 681             av_assert0(s->mb_skip_run == 0);
 682             encode_mb_skip_run(s, s->mb_x);
 683         } else {
 684             encode_mb_skip_run(s, s->mb_skip_run);
 685         }
 686
 687         if (s->pict_type == AV_PICTURE_TYPE_I) {
 688             if (s->dquant && cbp) {
 689                 /* macroblock_type: macroblock_quant = 1 */
 690                 put_mb_modes(s, 2, 1, 0, 0);
 691                 put_qscale(s);
 692             } else {
 693                 /* macroblock_type: macroblock_quant = 0 */
 694                 put_mb_modes(s, 1, 1, 0, 0);
 695                 s->qscale -= s->dquant;
 696             }
 697             s->misc_bits += get_bits_diff(s);
 698             s->i_count++;
 699         } else if (s->mb_intra) {
 700             if (s->dquant && cbp) {
 701                 put_mb_modes(s, 6, 0x01, 0, 0);
 702                 put_qscale(s);
 703             } else {
 704                 put_mb_modes(s, 5, 0x03, 0, 0);
 705                 s->qscale -= s->dquant;
 706             }
 707             s->misc_bits += get_bits_diff(s);
 708             s->i_count++;
 709             memset(s->last_mv, 0, sizeof(s->last_mv));
 710         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 711             if (s->mv_type == MV_TYPE_16X16) {
 712                 if (cbp != 0) {
 713                     if ((motion_x | motion_y) == 0) {
 714                         if (s->dquant) {
 715                             /* macroblock_pattern & quant */
 716                             put_mb_modes(s, 5, 1, 0, 0);
 717                             put_qscale(s);
 718                         } else {
 719                             /* macroblock_pattern only */
 720                             put_mb_modes(s, 2, 1, 0, 0);
 721                         }
 722                         s->misc_bits += get_bits_diff(s);
 723                     } else {
 724                         if (s->dquant) {
 725                             put_mb_modes(s, 5, 2, 1, 0);    /* motion + cbp */
 726                             put_qscale(s);
 727                         } else {
 728                             put_mb_modes(s, 1, 1, 1, 0);    /* motion + cbp */
 729                         }
 730                         s->misc_bits += get_bits_diff(s);
 731                         // RAL: f_code parameter added
 732                         mpeg1_encode_motion(s,
 733                                             motion_x - s->last_mv[0][0][0],
 734                                             s->f_code);
 735                         // RAL: f_code parameter added
 736                         mpeg1_encode_motion(s,
 737                                             motion_y - s->last_mv[0][0][1],
 738                                             s->f_code);
 739                         s->mv_bits += get_bits_diff(s);
 740                     }
 741                 } else {
 742                     put_bits(&s->pb, 3, 1);         /* motion only */
 743                     if (!s->frame_pred_frame_dct)
 744                         put_bits(&s->pb, 2, 2);     /* motion_type: frame */
 745                     s->misc_bits += get_bits_diff(s);
 746                     // RAL: f_code parameter added
 747                     mpeg1_encode_motion(s,
 748                                         motion_x - s->last_mv[0][0][0],
 749                                         s->f_code);
 750                     // RAL: f_code parameter added
 751                     mpeg1_encode_motion(s,
 752                                         motion_y - s->last_mv[0][0][1],
 753                                         s->f_code);
 754                     s->qscale  -= s->dquant;
 755                     s->mv_bits += get_bits_diff(s);
 756                 }
 757                 s->last_mv[0][1][0] = s->last_mv[0][0][0] = motion_x;
 758                 s->last_mv[0][1][1] = s->last_mv[0][0][1] = motion_y;
 759             } else {
 760                 av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 761
 762                 if (cbp) {
 763                     if (s->dquant) {
 764                         put_mb_modes(s, 5, 2, 1, 1);    /* motion + cbp */
 765                         put_qscale(s);
 766                     } else {
 767                         put_mb_modes(s, 1, 1, 1, 1);    /* motion + cbp */
 768                     }
 769                 } else {
 770                     put_bits(&s->pb, 3, 1);             /* motion only */
 771                     put_bits(&s->pb, 2, 1);             /* motion_type: field */
 772                     s->qscale -= s->dquant;
 773                 }
 774                 s->misc_bits += get_bits_diff(s);
 775                 for (i = 0; i < 2; i++) {
 776                     put_bits(&s->pb, 1, s->field_select[0][i]);
 777                     mpeg1_encode_motion(s,
 778                                         s->mv[0][i][0] - s->last_mv[0][i][0],
 779                                         s->f_code);
 780                     mpeg1_encode_motion(s,
 781                                         s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 782                                         s->f_code);
 783                     s->last_mv[0][i][0] = s->mv[0][i][0];
 784                     s->last_mv[0][i][1] = 2 * s->mv[0][i][1];
 785                 }
 786                 s->mv_bits += get_bits_diff(s);
 787             }
 788             if (cbp) {
 789                 if (s->chroma_y_shift) {
 790                     put_bits(&s->pb,
 791                              ff_mpeg12_mbPatTable[cbp][1],
 792                              ff_mpeg12_mbPatTable[cbp][0]);
 793                 } else {
 794                     put_bits(&s->pb,
 795                              ff_mpeg12_mbPatTable[cbp >> 2][1],
 796                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
 797                     put_sbits(&s->pb, 2, cbp);
 798                 }
 799             }
 800             s->f_count++;
 801         } else {
 802             if (s->mv_type == MV_TYPE_16X16) {
 803                 if (cbp) {                      // With coded bloc pattern
 804                     if (s->dquant) {
 805                         if (s->mv_dir == MV_DIR_FORWARD)
 806                             put_mb_modes(s, 6, 3, 1, 0);
 807                         else
 808                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 0);
 809                         put_qscale(s);
 810                     } else {
 811                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 0);
 812                     }
 813                 } else {                        // No coded bloc pattern
 814                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 815                     if (!s->frame_pred_frame_dct)
 816                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 817                     s->qscale -= s->dquant;
 818                 }
 819                 s->misc_bits += get_bits_diff(s);
 820                 if (s->mv_dir & MV_DIR_FORWARD) {
 821                     mpeg1_encode_motion(s,
 822                                         s->mv[0][0][0] - s->last_mv[0][0][0],
 823                                         s->f_code);
 824                     mpeg1_encode_motion(s,
 825                                         s->mv[0][0][1] - s->last_mv[0][0][1],
 826                                         s->f_code);
 827                     s->last_mv[0][0][0] =
 828                     s->last_mv[0][1][0] = s->mv[0][0][0];
 829                     s->last_mv[0][0][1] =
 830                     s->last_mv[0][1][1] = s->mv[0][0][1];
 831                     s->f_count++;
 832                 }
 833                 if (s->mv_dir & MV_DIR_BACKWARD) {
 834                     mpeg1_encode_motion(s,
 835                                         s->mv[1][0][0] - s->last_mv[1][0][0],
 836                                         s->b_code);
 837                     mpeg1_encode_motion(s,
 838                                         s->mv[1][0][1] - s->last_mv[1][0][1],
 839                                         s->b_code);
 840                     s->last_mv[1][0][0] =
 841                     s->last_mv[1][1][0] = s->mv[1][0][0];
 842                     s->last_mv[1][0][1] =
 843                     s->last_mv[1][1][1] = s->mv[1][0][1];
 844                     s->b_count++;
 845                 }
 846             } else {
 847                 av_assert2(s->mv_type == MV_TYPE_FIELD);
 848                 av_assert2(!s->frame_pred_frame_dct);
 849                 if (cbp) {                      // With coded bloc pattern
 850                     if (s->dquant) {
 851                         if (s->mv_dir == MV_DIR_FORWARD)
 852                             put_mb_modes(s, 6, 3, 1, 1);
 853                         else
 854                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 1);
 855                         put_qscale(s);
 856                     } else {
 857                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 1);
 858                     }
 859                 } else {                        // No coded bloc pattern
 860                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 861                     put_bits(&s->pb, 2, 1);     /* motion_type: field */
 862                     s->qscale -= s->dquant;
 863                 }
 864                 s->misc_bits += get_bits_diff(s);
 865                 if (s->mv_dir & MV_DIR_FORWARD) {
 866                     for (i = 0; i < 2; i++) {
 867                         put_bits(&s->pb, 1, s->field_select[0][i]);
 868                         mpeg1_encode_motion(s,
 869                                             s->mv[0][i][0] - s->last_mv[0][i][0],
 870                                             s->f_code);
 871                         mpeg1_encode_motion(s,
 872                                             s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 873                                             s->f_code);
 874                         s->last_mv[0][i][0] = s->mv[0][i][0];
 875                         s->last_mv[0][i][1] = s->mv[0][i][1] * 2;
 876                     }
 877                     s->f_count++;
 878                 }
 879                 if (s->mv_dir & MV_DIR_BACKWARD) {
 880                     for (i = 0; i < 2; i++) {
 881                         put_bits(&s->pb, 1, s->field_select[1][i]);
 882                         mpeg1_encode_motion(s,
 883                                             s->mv[1][i][0] - s->last_mv[1][i][0],
 884                                             s->b_code);
 885                         mpeg1_encode_motion(s,
 886                                             s->mv[1][i][1] - (s->last_mv[1][i][1] >> 1),
 887                                             s->b_code);
 888                         s->last_mv[1][i][0] = s->mv[1][i][0];
 889                         s->last_mv[1][i][1] = s->mv[1][i][1] * 2;
 890                     }
 891                     s->b_count++;
 892                 }
 893             }
 894             s->mv_bits += get_bits_diff(s);
 895             if (cbp) {
 896                 if (s->chroma_y_shift) {
 897                     put_bits(&s->pb,
 898                              ff_mpeg12_mbPatTable[cbp][1],
 899                              ff_mpeg12_mbPatTable[cbp][0]);
 900                 } else {
 901                     put_bits(&s->pb,
 902                              ff_mpeg12_mbPatTable[cbp >> 2][1],
 903                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
 904                     put_sbits(&s->pb, 2, cbp);
 905                 }
 906             }
 907         }
 908         for (i = 0; i < mb_block_count; i++)
 909             if (cbp & (1 << (mb_block_count - 1 - i)))
 910                 mpeg1_encode_block(s, block[i], i);
 911         s->mb_skip_run = 0;
 912         if (s->mb_intra)
 913             s->i_tex_bits += get_bits_diff(s);
 914         else
 915             s->p_tex_bits += get_bits_diff(s);
 916     }
 917 }
 918
 919 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[6][64],
 920                         int motion_x, int motion_y)
 921 {
 922     if (s->chroma_format == CHROMA_420)
 923         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 924     else
 925         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 926 }
 927
 928 av_cold void ff_mpeg1_encode_init(MpegEncContext *s)
 929 {
 930     static int done = 0;
 931
 932     ff_mpeg12_common_init(s);
 933
 934     if (!done) {
 935         int f_code;
 936         int mv;
 937         int i;
 938
 939         done = 1;
 940         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 941         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 942
 943         for (i = 0; i < 64; i++) {
 944             mpeg1_max_level[0][i] = ff_rl_mpeg1.max_level[0][i];
 945             mpeg1_index_run[0][i] = ff_rl_mpeg1.index_run[0][i];
 946         }
 947
 948         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 949         if (s->intra_vlc_format)
 950             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 951
 952         /* build unified dc encoding tables */
 953         for (i = -255; i < 256; i++) {
 954             int adiff, index;
 955             int bits, code;
 956             int diff = i;
 957
 958             adiff = FFABS(diff);
 959             if (diff < 0)
 960                 diff--;
 961             index = av_log2(2 * adiff);
 962
 963             bits = ff_mpeg12_vlc_dc_lum_bits[index] + index;
 964             code = (ff_mpeg12_vlc_dc_lum_code[index] << index) +
 965                    (diff & ((1 << index) - 1));
 966             mpeg1_lum_dc_uni[i + 255] = bits + (code << 8);
 967
 968             bits = ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 969             code = (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
 970                    (diff & ((1 << index) - 1));
 971             mpeg1_chr_dc_uni[i + 255] = bits + (code << 8);
 972         }
 973
 974         for (f_code = 1; f_code <= MAX_FCODE; f_code++)
 975             for (mv = -MAX_MV; mv <= MAX_MV; mv++) {
 976                 int len;
 977
 978                 if (mv == 0) {
 979                     len = ff_mpeg12_mbMotionVectorTable[0][1];
 980                 } else {
 981                     int val, bit_size, code;
 982
 983                     bit_size = f_code - 1;
 984
 985                     val = mv;
 986                     if (val < 0)
 987                         val = -val;
 988                     val--;
 989                     code = (val >> bit_size) + 1;
 990                     if (code < 17)
 991                         len = ff_mpeg12_mbMotionVectorTable[code][1] +
 992                               1 + bit_size;
 993                     else
 994                         len = ff_mpeg12_mbMotionVectorTable[16][1] +
 995                               2 + bit_size;
 996                 }
 997
 998                 mv_penalty[f_code][mv + MAX_MV] = len;
 999             }
1000
1001
1002         for (f_code = MAX_FCODE; f_code > 0; f_code--)
1003             for (mv = -(8 << f_code); mv < (8 << f_code); mv++)
1004                 fcode_tab[mv + MAX_MV] = f_code;
1005     }
1006     s->me.mv_penalty = mv_penalty;
1007     s->fcode_tab     = fcode_tab;
1008     if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1009         s->min_qcoeff = -255;
1010         s->max_qcoeff = 255;
1011     } else {
1012         s->min_qcoeff = -2047;
1013         s->max_qcoeff = 2047;
1014     }
1015     if (s->intra_vlc_format) {
1016         s->intra_ac_vlc_length      =
1017         s->intra_ac_vlc_last_length = uni_mpeg2_ac_vlc_len;
1018     } else {
1019         s->intra_ac_vlc_length      =
1020         s->intra_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1021     }
1022     s->inter_ac_vlc_length      =
1023     s->inter_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1024 }
1025
1026 #define OFFSET(x) offsetof(MpegEncContext, x)
1027 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
1028 #define COMMON_OPTS                                                           \
1029     { "gop_timecode",        "MPEG GOP Timecode in hh:mm:ss[:;.]ff format",   \
1030       OFFSET(tc_opt_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, VE },\
1031     { "intra_vlc",           "Use MPEG-2 intra VLC table.",                   \
1032       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE }, \
1033     { "drop_frame_timecode", "Timecode is in drop frame format.",             \
1034       OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE }, \
1035     { "scan_offset",         "Reserve space for SVCD scan offset user data.", \
1036       OFFSET(scan_offset),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1037
1038 static const AVOption mpeg1_options[] = {
1039     COMMON_OPTS
1040     FF_MPV_COMMON_OPTS
1041     { NULL },
1042 };
1043
1044 static const AVOption mpeg2_options[] = {
1045     COMMON_OPTS
1046     { "non_linear_quant", "Use nonlinear quantizer.",    OFFSET(q_scale_type),   AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1047     { "alternate_scan",   "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1048     FF_MPV_COMMON_OPTS
1049     { NULL },
1050 };
1051
1052 #define mpeg12_class(x)                                 \
1053 static const AVClass mpeg ## x ## _class = {            \
1054     .class_name = "mpeg" # x "video encoder",           \
1055     .item_name  = av_default_item_name,                 \
1056     .option     = mpeg ## x ## _options,                \
1057     .version    = LIBAVUTIL_VERSION_INT,                \
1058 };
1059
1060 mpeg12_class(1)
1061 mpeg12_class(2)
1062
1063 AVCodec ff_mpeg1video_encoder = {
1064     .name                 = "mpeg1video",
1065     .type                 = AVMEDIA_TYPE_VIDEO,
1066     .id                   = AV_CODEC_ID_MPEG1VIDEO,
1067     .priv_data_size       = sizeof(MpegEncContext),
1068     .init                 = encode_init,
1069     .encode2              = ff_MPV_encode_picture,
1070     .close                = ff_MPV_encode_end,
1071     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
1072     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1073                                                            AV_PIX_FMT_NONE },
1074     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1075     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
1076     .priv_class           = &mpeg1_class,
1077 };
1078
1079 AVCodec ff_mpeg2video_encoder = {
1080     .name                 = "mpeg2video",
1081     .type                 = AVMEDIA_TYPE_VIDEO,
1082     .id                   = AV_CODEC_ID_MPEG2VIDEO,
1083     .priv_data_size       = sizeof(MpegEncContext),
1084     .init                 = encode_init,
1085     .encode2              = ff_MPV_encode_picture,
1086     .close                = ff_MPV_encode_end,
1087     .supported_framerates = ff_mpeg2_frame_rate_tab,
1088     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1089                                                            AV_PIX_FMT_YUV422P,
1090                                                            AV_PIX_FMT_NONE },
1091     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1092     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1093     .priv_class           = &mpeg2_class,
1094 };