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 multiplies 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     float best_aspect_error = 1E10;
 244     float aspect_ratio      = av_q2d(s->avctx->sample_aspect_ratio);
 245
 246     if (aspect_ratio == 0.0)
 247         aspect_ratio = 1.0;             // 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             float error = aspect_ratio;
 260             if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <= 1)
 261                 error -= 1.0 / ff_mpeg1_aspect[i];
 262             else
 263                 error -= av_q2d(ff_mpeg2_aspect[i]) * s->height / s->width;
 264
 265             error = FFABS(error);
 266
 267             if (error < 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             put_header(s, EXT_START_CODE);
 315             put_bits(&s->pb, 4, 1);                 // seq ext
 316
 317             put_bits(&s->pb, 1, s->avctx->profile == 0); // escx 1 for 4:2:2 profile
 318
 319             put_bits(&s->pb, 3, s->avctx->profile); // profile
 320             put_bits(&s->pb, 4, s->avctx->level);   // level
 321
 322             put_bits(&s->pb, 1, s->progressive_sequence);
 323             put_bits(&s->pb, 2, s->chroma_format);
 324             put_bits(&s->pb, 2, s->width  >> 12);
 325             put_bits(&s->pb, 2, s->height >> 12);
 326             put_bits(&s->pb, 12, v >> 18);          // bitrate ext
 327             put_bits(&s->pb, 1, 1);                 // marker
 328             put_bits(&s->pb, 8, vbv_buffer_size >> 10); // vbv buffer ext
 329             put_bits(&s->pb, 1, s->low_delay);
 330             put_bits(&s->pb, 2, s->mpeg2_frame_rate_ext.num-1); // frame_rate_ext_n
 331             put_bits(&s->pb, 5, s->mpeg2_frame_rate_ext.den-1); // frame_rate_ext_d
 332         }
 333
 334         put_header(s, GOP_START_CODE);
 335         put_bits(&s->pb, 1, s->drop_frame_timecode);    // drop frame flag
 336         /* time code: we must convert from the real frame rate to a
 337          * fake MPEG frame rate in case of low frame rate */
 338         fps       = (framerate.num + framerate.den / 2) / framerate.den;
 339         time_code = s->current_picture_ptr->f->coded_picture_number +
 340                     s->avctx->timecode_frame_start;
 341
 342         s->gop_picture_number = s->current_picture_ptr->f->coded_picture_number;
 343
 344         av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));
 345         if (s->drop_frame_timecode)
 346             time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);
 347
 348         put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 349         put_bits(&s->pb, 6, (uint32_t)((time_code / (fps *   60)) % 60));
 350         put_bits(&s->pb, 1, 1);
 351         put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 352         put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 353         put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP) || s->intra_only || !s->gop_picture_number);
 354         put_bits(&s->pb, 1, 0);                     // broken link
 355     }
 356 }
 357
 358 static inline void encode_mb_skip_run(MpegEncContext *s, int run)
 359 {
 360     while (run >= 33) {
 361         put_bits(&s->pb, 11, 0x008);
 362         run -= 33;
 363     }
 364     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 365              ff_mpeg12_mbAddrIncrTable[run][0]);
 366 }
 367
 368 static av_always_inline void put_qscale(MpegEncContext *s)
 369 {
 370     if (s->q_scale_type) {
 371         av_assert2(s->qscale >= 1 && s->qscale <= 12);
 372         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 373     } else {
 374         put_bits(&s->pb, 5, s->qscale);
 375     }
 376 }
 377
 378 void ff_mpeg1_encode_slice_header(MpegEncContext *s)
 379 {
 380     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
 381         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 382         /* slice_vertical_position_extension */
 383         put_bits(&s->pb, 3, s->mb_y >> 7);
 384     } else {
 385         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 386     }
 387     put_qscale(s);
 388     /* slice extra information */
 389     put_bits(&s->pb, 1, 0);
 390 }
 391
 392 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 393 {
 394     AVFrameSideData *side_data;
 395     mpeg1_encode_sequence_header(s);
 396
 397     /* mpeg1 picture header */
 398     put_header(s, PICTURE_START_CODE);
 399     /* temporal reference */
 400
 401     // RAL: s->picture_number instead of s->fake_picture_number
 402     put_bits(&s->pb, 10,
 403              (s->picture_number - s->gop_picture_number) & 0x3ff);
 404     put_bits(&s->pb, 3, s->pict_type);
 405
 406     s->vbv_delay_ptr = s->pb.buf + put_bits_count(&s->pb) / 8;
 407     put_bits(&s->pb, 16, 0xFFFF);               /* vbv_delay */
 408
 409     // RAL: Forward f_code also needed for B-frames
 410     if (s->pict_type == AV_PICTURE_TYPE_P ||
 411         s->pict_type == AV_PICTURE_TYPE_B) {
 412         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 413         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 414             put_bits(&s->pb, 3, s->f_code);     /* forward_f_code */
 415         else
 416             put_bits(&s->pb, 3, 7);             /* forward_f_code */
 417     }
 418
 419     // RAL: Backward f_code necessary for B-frames
 420     if (s->pict_type == AV_PICTURE_TYPE_B) {
 421         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 422         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 423             put_bits(&s->pb, 3, s->b_code);     /* backward_f_code */
 424         else
 425             put_bits(&s->pb, 3, 7);             /* backward_f_code */
 426     }
 427
 428     put_bits(&s->pb, 1, 0);                     /* extra bit picture */
 429
 430     s->frame_pred_frame_dct = 1;
 431     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 432         put_header(s, EXT_START_CODE);
 433         put_bits(&s->pb, 4, 8);                 /* pic ext */
 434         if (s->pict_type == AV_PICTURE_TYPE_P ||
 435             s->pict_type == AV_PICTURE_TYPE_B) {
 436             put_bits(&s->pb, 4, s->f_code);
 437             put_bits(&s->pb, 4, s->f_code);
 438         } else {
 439             put_bits(&s->pb, 8, 255);
 440         }
 441         if (s->pict_type == AV_PICTURE_TYPE_B) {
 442             put_bits(&s->pb, 4, s->b_code);
 443             put_bits(&s->pb, 4, s->b_code);
 444         } else {
 445             put_bits(&s->pb, 8, 255);
 446         }
 447         put_bits(&s->pb, 2, s->intra_dc_precision);
 448
 449         av_assert0(s->picture_structure == PICT_FRAME);
 450         put_bits(&s->pb, 2, s->picture_structure);
 451         if (s->progressive_sequence)
 452             put_bits(&s->pb, 1, 0);             /* no repeat */
 453         else
 454             put_bits(&s->pb, 1, s->current_picture_ptr->f->top_field_first);
 455         /* XXX: optimize the generation of this flag with entropy measures */
 456         s->frame_pred_frame_dct = s->progressive_sequence;
 457
 458         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 459         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 460         put_bits(&s->pb, 1, s->q_scale_type);
 461         put_bits(&s->pb, 1, s->intra_vlc_format);
 462         put_bits(&s->pb, 1, s->alternate_scan);
 463         put_bits(&s->pb, 1, s->repeat_first_field);
 464         s->progressive_frame = s->progressive_sequence;
 465         /* chroma_420_type */
 466         put_bits(&s->pb, 1, s->chroma_format ==
 467                             CHROMA_420 ? s->progressive_frame : 0);
 468         put_bits(&s->pb, 1, s->progressive_frame);
 469         put_bits(&s->pb, 1, 0);                 /* composite_display_flag */
 470     }
 471     if (s->scan_offset) {
 472         int i;
 473
 474         put_header(s, USER_START_CODE);
 475         for (i = 0; i < sizeof(svcd_scan_offset_placeholder); i++)
 476             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 477     }
 478     side_data = av_frame_get_side_data(s->current_picture_ptr->f,
 479                                        AV_FRAME_DATA_STEREO3D);
 480     if (side_data) {
 481         AVStereo3D *stereo = (AVStereo3D *)side_data->data;
 482         uint8_t fpa_type;
 483
 484         switch (stereo->type) {
 485         case AV_STEREO3D_SIDEBYSIDE:
 486             fpa_type = 0x03;
 487             break;
 488         case AV_STEREO3D_TOPBOTTOM:
 489             fpa_type = 0x04;
 490             break;
 491         case AV_STEREO3D_2D:
 492             fpa_type = 0x08;
 493             break;
 494         case AV_STEREO3D_SIDEBYSIDE_QUINCUNX:
 495             fpa_type = 0x23;
 496             break;
 497         default:
 498             fpa_type = 0;
 499             break;
 500         }
 501
 502         if (fpa_type != 0) {
 503             put_header(s, USER_START_CODE);
 504             put_bits(&s->pb, 8, 'J');   // S3D_video_format_signaling_identifier
 505             put_bits(&s->pb, 8, 'P');
 506             put_bits(&s->pb, 8, '3');
 507             put_bits(&s->pb, 8, 'D');
 508             put_bits(&s->pb, 8, 0x03);  // S3D_video_format_length
 509
 510             put_bits(&s->pb, 1, 1);     // reserved_bit
 511             put_bits(&s->pb, 7, fpa_type); // S3D_video_format_type
 512             put_bits(&s->pb, 8, 0x04);  // reserved_data[0]
 513             put_bits(&s->pb, 8, 0xFF);  // reserved_data[1]
 514         }
 515     }
 516
 517     s->mb_y = 0;
 518     ff_mpeg1_encode_slice_header(s);
 519 }
 520
 521 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 522                                 int has_mv, int field_motion)
 523 {
 524     put_bits(&s->pb, n, bits);
 525     if (!s->frame_pred_frame_dct) {
 526         if (has_mv)
 527             /* motion_type: frame/field */
 528             put_bits(&s->pb, 2, 2 - field_motion);
 529         put_bits(&s->pb, 1, s->interlaced_dct);
 530     }
 531 }
 532
 533 // RAL: Parameter added: f_or_b_code
 534 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 535 {
 536     if (val == 0) {
 537         /* zero vector */
 538         put_bits(&s->pb,
 539                  ff_mpeg12_mbMotionVectorTable[0][1],
 540                  ff_mpeg12_mbMotionVectorTable[0][0]);
 541     } else {
 542         int code, sign, bits;
 543         int bit_size = f_or_b_code - 1;
 544         int range    = 1 << bit_size;
 545         /* modulo encoding */
 546         val = sign_extend(val, 5 + bit_size);
 547
 548         if (val >= 0) {
 549             val--;
 550             code = (val >> bit_size) + 1;
 551             bits = val & (range - 1);
 552             sign = 0;
 553         } else {
 554             val = -val;
 555             val--;
 556             code = (val >> bit_size) + 1;
 557             bits = val & (range - 1);
 558             sign = 1;
 559         }
 560
 561         av_assert2(code > 0 && code <= 16);
 562
 563         put_bits(&s->pb,
 564                  ff_mpeg12_mbMotionVectorTable[code][1],
 565                  ff_mpeg12_mbMotionVectorTable[code][0]);
 566
 567         put_bits(&s->pb, 1, sign);
 568         if (bit_size > 0)
 569             put_bits(&s->pb, bit_size, bits);
 570     }
 571 }
 572
 573 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 574 {
 575     if (((unsigned) (diff + 255)) >= 511) {
 576         int index;
 577
 578         if (diff < 0) {
 579             index = av_log2_16bit(-2 * diff);
 580             diff--;
 581         } else {
 582             index = av_log2_16bit(2 * diff);
 583         }
 584         if (component == 0)
 585             put_bits(&s->pb,
 586                      ff_mpeg12_vlc_dc_lum_bits[index] + index,
 587                      (ff_mpeg12_vlc_dc_lum_code[index] << index) +
 588                      (diff & ((1 << index) - 1)));
 589         else
 590             put_bits(&s->pb,
 591                      ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 592                      (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
 593                      (diff & ((1 << index) - 1)));
 594     } else {
 595         if (component == 0)
 596             put_bits(&s->pb,
 597                      mpeg1_lum_dc_uni[diff + 255] & 0xFF,
 598                      mpeg1_lum_dc_uni[diff + 255] >> 8);
 599         else
 600             put_bits(&s->pb,
 601                      mpeg1_chr_dc_uni[diff + 255] & 0xFF,
 602                      mpeg1_chr_dc_uni[diff + 255] >> 8);
 603     }
 604 }
 605
 606 static void mpeg1_encode_block(MpegEncContext *s, int16_t *block, int n)
 607 {
 608     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 609     int code, component;
 610     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 611
 612     last_index = s->block_last_index[n];
 613
 614     /* DC coef */
 615     if (s->mb_intra) {
 616         component = (n <= 3 ? 0 : (n & 1) + 1);
 617         dc        = block[0];                   /* overflow is impossible */
 618         diff      = dc - s->last_dc[component];
 619         encode_dc(s, diff, component);
 620         s->last_dc[component] = dc;
 621         i = 1;
 622         if (s->intra_vlc_format)
 623             table_vlc = ff_rl_mpeg2.table_vlc;
 624     } else {
 625         /* encode the first coefficient: needs to be done here because
 626          * it is handled slightly differently */
 627         level = block[0];
 628         if (abs(level) == 1) {
 629             code = ((uint32_t)level >> 31);     /* the sign bit */
 630             put_bits(&s->pb, 2, code | 0x02);
 631             i = 1;
 632         } else {
 633             i             = 0;
 634             last_non_zero = -1;
 635             goto next_coef;
 636         }
 637     }
 638
 639     /* now quantify & encode AC coefs */
 640     last_non_zero = i - 1;
 641
 642     for (; i <= last_index; i++) {
 643         j     = s->intra_scantable.permutated[i];
 644         level = block[j];
 645
 646 next_coef:
 647         /* encode using VLC */
 648         if (level != 0) {
 649             run = i - last_non_zero - 1;
 650
 651             alevel = level;
 652             MASK_ABS(sign, alevel);
 653             sign &= 1;
 654
 655             if (alevel <= mpeg1_max_level[0][run]) {
 656                 code = mpeg1_index_run[0][run] + alevel - 1;
 657                 /* store the VLC & sign at once */
 658                 put_bits(&s->pb, table_vlc[code][1] + 1,
 659                          (table_vlc[code][0] << 1) + sign);
 660             } else {
 661                 /* escape seems to be pretty rare <5% so I do not optimize it */
 662                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 663                 /* escape: only clip in this case */
 664                 put_bits(&s->pb, 6, run);
 665                 if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
 666                     if (alevel < 128) {
 667                         put_sbits(&s->pb, 8, level);
 668                     } else {
 669                         if (level < 0)
 670                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 671                         else
 672                             put_sbits(&s->pb, 16, level);
 673                     }
 674                 } else {
 675                     put_sbits(&s->pb, 12, level);
 676                 }
 677             }
 678             last_non_zero = i;
 679         }
 680     }
 681     /* end of block */
 682     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 683 }
 684
 685 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 686                                                       int16_t block[8][64],
 687                                                       int motion_x, int motion_y,
 688                                                       int mb_block_count)
 689 {
 690     int i, cbp;
 691     const int mb_x     = s->mb_x;
 692     const int mb_y     = s->mb_y;
 693     const int first_mb = mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 694
 695     /* compute cbp */
 696     cbp = 0;
 697     for (i = 0; i < mb_block_count; i++)
 698         if (s->block_last_index[i] >= 0)
 699             cbp |= 1 << (mb_block_count - 1 - i);
 700
 701     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 702         (mb_x != s->mb_width - 1 ||
 703          (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
 704         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 705          (s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir &&
 706           (((s->mv_dir & MV_DIR_FORWARD)
 707             ? ((s->mv[0][0][0] - s->last_mv[0][0][0]) |
 708                (s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
 709            ((s->mv_dir & MV_DIR_BACKWARD)
 710             ? ((s->mv[1][0][0] - s->last_mv[1][0][0]) |
 711                (s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
 712         s->mb_skip_run++;
 713         s->qscale -= s->dquant;
 714         s->skip_count++;
 715         s->misc_bits++;
 716         s->last_bits++;
 717         if (s->pict_type == AV_PICTURE_TYPE_P) {
 718             s->last_mv[0][0][0] =
 719             s->last_mv[0][0][1] =
 720             s->last_mv[0][1][0] =
 721             s->last_mv[0][1][1] = 0;
 722         }
 723     } else {
 724         if (first_mb) {
 725             av_assert0(s->mb_skip_run == 0);
 726             encode_mb_skip_run(s, s->mb_x);
 727         } else {
 728             encode_mb_skip_run(s, s->mb_skip_run);
 729         }
 730
 731         if (s->pict_type == AV_PICTURE_TYPE_I) {
 732             if (s->dquant && cbp) {
 733                 /* macroblock_type: macroblock_quant = 1 */
 734                 put_mb_modes(s, 2, 1, 0, 0);
 735                 put_qscale(s);
 736             } else {
 737                 /* macroblock_type: macroblock_quant = 0 */
 738                 put_mb_modes(s, 1, 1, 0, 0);
 739                 s->qscale -= s->dquant;
 740             }
 741             s->misc_bits += get_bits_diff(s);
 742             s->i_count++;
 743         } else if (s->mb_intra) {
 744             if (s->dquant && cbp) {
 745                 put_mb_modes(s, 6, 0x01, 0, 0);
 746                 put_qscale(s);
 747             } else {
 748                 put_mb_modes(s, 5, 0x03, 0, 0);
 749                 s->qscale -= s->dquant;
 750             }
 751             s->misc_bits += get_bits_diff(s);
 752             s->i_count++;
 753             memset(s->last_mv, 0, sizeof(s->last_mv));
 754         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 755             if (s->mv_type == MV_TYPE_16X16) {
 756                 if (cbp != 0) {
 757                     if ((motion_x | motion_y) == 0) {
 758                         if (s->dquant) {
 759                             /* macroblock_pattern & quant */
 760                             put_mb_modes(s, 5, 1, 0, 0);
 761                             put_qscale(s);
 762                         } else {
 763                             /* macroblock_pattern only */
 764                             put_mb_modes(s, 2, 1, 0, 0);
 765                         }
 766                         s->misc_bits += get_bits_diff(s);
 767                     } else {
 768                         if (s->dquant) {
 769                             put_mb_modes(s, 5, 2, 1, 0);    /* motion + cbp */
 770                             put_qscale(s);
 771                         } else {
 772                             put_mb_modes(s, 1, 1, 1, 0);    /* motion + cbp */
 773                         }
 774                         s->misc_bits += get_bits_diff(s);
 775                         // RAL: f_code parameter added
 776                         mpeg1_encode_motion(s,
 777                                             motion_x - s->last_mv[0][0][0],
 778                                             s->f_code);
 779                         // RAL: f_code parameter added
 780                         mpeg1_encode_motion(s,
 781                                             motion_y - s->last_mv[0][0][1],
 782                                             s->f_code);
 783                         s->mv_bits += get_bits_diff(s);
 784                     }
 785                 } else {
 786                     put_bits(&s->pb, 3, 1);         /* motion only */
 787                     if (!s->frame_pred_frame_dct)
 788                         put_bits(&s->pb, 2, 2);     /* motion_type: frame */
 789                     s->misc_bits += get_bits_diff(s);
 790                     // RAL: f_code parameter added
 791                     mpeg1_encode_motion(s,
 792                                         motion_x - s->last_mv[0][0][0],
 793                                         s->f_code);
 794                     // RAL: f_code parameter added
 795                     mpeg1_encode_motion(s,
 796                                         motion_y - s->last_mv[0][0][1],
 797                                         s->f_code);
 798                     s->qscale  -= s->dquant;
 799                     s->mv_bits += get_bits_diff(s);
 800                 }
 801                 s->last_mv[0][1][0] = s->last_mv[0][0][0] = motion_x;
 802                 s->last_mv[0][1][1] = s->last_mv[0][0][1] = motion_y;
 803             } else {
 804                 av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 805
 806                 if (cbp) {
 807                     if (s->dquant) {
 808                         put_mb_modes(s, 5, 2, 1, 1);    /* motion + cbp */
 809                         put_qscale(s);
 810                     } else {
 811                         put_mb_modes(s, 1, 1, 1, 1);    /* motion + cbp */
 812                     }
 813                 } else {
 814                     put_bits(&s->pb, 3, 1);             /* motion only */
 815                     put_bits(&s->pb, 2, 1);             /* motion_type: field */
 816                     s->qscale -= s->dquant;
 817                 }
 818                 s->misc_bits += get_bits_diff(s);
 819                 for (i = 0; i < 2; i++) {
 820                     put_bits(&s->pb, 1, s->field_select[0][i]);
 821                     mpeg1_encode_motion(s,
 822                                         s->mv[0][i][0] - s->last_mv[0][i][0],
 823                                         s->f_code);
 824                     mpeg1_encode_motion(s,
 825                                         s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 826                                         s->f_code);
 827                     s->last_mv[0][i][0] = s->mv[0][i][0];
 828                     s->last_mv[0][i][1] = 2 * s->mv[0][i][1];
 829                 }
 830                 s->mv_bits += get_bits_diff(s);
 831             }
 832             if (cbp) {
 833                 if (s->chroma_y_shift) {
 834                     put_bits(&s->pb,
 835                              ff_mpeg12_mbPatTable[cbp][1],
 836                              ff_mpeg12_mbPatTable[cbp][0]);
 837                 } else {
 838                     put_bits(&s->pb,
 839                              ff_mpeg12_mbPatTable[cbp >> 2][1],
 840                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
 841                     put_sbits(&s->pb, 2, cbp);
 842                 }
 843             }
 844             s->f_count++;
 845         } else {
 846             if (s->mv_type == MV_TYPE_16X16) {
 847                 if (cbp) {                      // With coded bloc pattern
 848                     if (s->dquant) {
 849                         if (s->mv_dir == MV_DIR_FORWARD)
 850                             put_mb_modes(s, 6, 3, 1, 0);
 851                         else
 852                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 0);
 853                         put_qscale(s);
 854                     } else {
 855                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 0);
 856                     }
 857                 } else {                        // No coded bloc pattern
 858                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 859                     if (!s->frame_pred_frame_dct)
 860                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 861                     s->qscale -= s->dquant;
 862                 }
 863                 s->misc_bits += get_bits_diff(s);
 864                 if (s->mv_dir & MV_DIR_FORWARD) {
 865                     mpeg1_encode_motion(s,
 866                                         s->mv[0][0][0] - s->last_mv[0][0][0],
 867                                         s->f_code);
 868                     mpeg1_encode_motion(s,
 869                                         s->mv[0][0][1] - s->last_mv[0][0][1],
 870                                         s->f_code);
 871                     s->last_mv[0][0][0] =
 872                     s->last_mv[0][1][0] = s->mv[0][0][0];
 873                     s->last_mv[0][0][1] =
 874                     s->last_mv[0][1][1] = s->mv[0][0][1];
 875                     s->f_count++;
 876                 }
 877                 if (s->mv_dir & MV_DIR_BACKWARD) {
 878                     mpeg1_encode_motion(s,
 879                                         s->mv[1][0][0] - s->last_mv[1][0][0],
 880                                         s->b_code);
 881                     mpeg1_encode_motion(s,
 882                                         s->mv[1][0][1] - s->last_mv[1][0][1],
 883                                         s->b_code);
 884                     s->last_mv[1][0][0] =
 885                     s->last_mv[1][1][0] = s->mv[1][0][0];
 886                     s->last_mv[1][0][1] =
 887                     s->last_mv[1][1][1] = s->mv[1][0][1];
 888                     s->b_count++;
 889                 }
 890             } else {
 891                 av_assert2(s->mv_type == MV_TYPE_FIELD);
 892                 av_assert2(!s->frame_pred_frame_dct);
 893                 if (cbp) {                      // With coded bloc pattern
 894                     if (s->dquant) {
 895                         if (s->mv_dir == MV_DIR_FORWARD)
 896                             put_mb_modes(s, 6, 3, 1, 1);
 897                         else
 898                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 1);
 899                         put_qscale(s);
 900                     } else {
 901                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 1);
 902                     }
 903                 } else {                        // No coded bloc pattern
 904                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 905                     put_bits(&s->pb, 2, 1);     /* motion_type: field */
 906                     s->qscale -= s->dquant;
 907                 }
 908                 s->misc_bits += get_bits_diff(s);
 909                 if (s->mv_dir & MV_DIR_FORWARD) {
 910                     for (i = 0; i < 2; i++) {
 911                         put_bits(&s->pb, 1, s->field_select[0][i]);
 912                         mpeg1_encode_motion(s,
 913                                             s->mv[0][i][0] - s->last_mv[0][i][0],
 914                                             s->f_code);
 915                         mpeg1_encode_motion(s,
 916                                             s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 917                                             s->f_code);
 918                         s->last_mv[0][i][0] = s->mv[0][i][0];
 919                         s->last_mv[0][i][1] = s->mv[0][i][1] * 2;
 920                     }
 921                     s->f_count++;
 922                 }
 923                 if (s->mv_dir & MV_DIR_BACKWARD) {
 924                     for (i = 0; i < 2; i++) {
 925                         put_bits(&s->pb, 1, s->field_select[1][i]);
 926                         mpeg1_encode_motion(s,
 927                                             s->mv[1][i][0] - s->last_mv[1][i][0],
 928                                             s->b_code);
 929                         mpeg1_encode_motion(s,
 930                                             s->mv[1][i][1] - (s->last_mv[1][i][1] >> 1),
 931                                             s->b_code);
 932                         s->last_mv[1][i][0] = s->mv[1][i][0];
 933                         s->last_mv[1][i][1] = s->mv[1][i][1] * 2;
 934                     }
 935                     s->b_count++;
 936                 }
 937             }
 938             s->mv_bits += get_bits_diff(s);
 939             if (cbp) {
 940                 if (s->chroma_y_shift) {
 941                     put_bits(&s->pb,
 942                              ff_mpeg12_mbPatTable[cbp][1],
 943                              ff_mpeg12_mbPatTable[cbp][0]);
 944                 } else {
 945                     put_bits(&s->pb,
 946                              ff_mpeg12_mbPatTable[cbp >> 2][1],
 947                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
 948                     put_sbits(&s->pb, 2, cbp);
 949                 }
 950             }
 951         }
 952         for (i = 0; i < mb_block_count; i++)
 953             if (cbp & (1 << (mb_block_count - 1 - i)))
 954                 mpeg1_encode_block(s, block[i], i);
 955         s->mb_skip_run = 0;
 956         if (s->mb_intra)
 957             s->i_tex_bits += get_bits_diff(s);
 958         else
 959             s->p_tex_bits += get_bits_diff(s);
 960     }
 961 }
 962
 963 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
 964                         int motion_x, int motion_y)
 965 {
 966     if (s->chroma_format == CHROMA_420)
 967         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 968     else
 969         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 970 }
 971
 972 av_cold void ff_mpeg1_encode_init(MpegEncContext *s)
 973 {
 974     static int done = 0;
 975
 976     ff_mpeg12_common_init(s);
 977
 978     if (!done) {
 979         int f_code;
 980         int mv;
 981         int i;
 982
 983         done = 1;
 984         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 985         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 986
 987         for (i = 0; i < 64; i++) {
 988             mpeg1_max_level[0][i] = ff_rl_mpeg1.max_level[0][i];
 989             mpeg1_index_run[0][i] = ff_rl_mpeg1.index_run[0][i];
 990         }
 991
 992         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 993         if (s->intra_vlc_format)
 994             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 995
 996         /* build unified dc encoding tables */
 997         for (i = -255; i < 256; i++) {
 998             int adiff, index;
 999             int bits, code;
1000             int diff = i;
1001
1002             adiff = FFABS(diff);
1003             if (diff < 0)
1004                 diff--;
1005             index = av_log2(2 * adiff);
1006
1007             bits = ff_mpeg12_vlc_dc_lum_bits[index] + index;
1008             code = (ff_mpeg12_vlc_dc_lum_code[index] << index) +
1009                    (diff & ((1 << index) - 1));
1010             mpeg1_lum_dc_uni[i + 255] = bits + (code << 8);
1011
1012             bits = ff_mpeg12_vlc_dc_chroma_bits[index] + index;
1013             code = (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
1014                    (diff & ((1 << index) - 1));
1015             mpeg1_chr_dc_uni[i + 255] = bits + (code << 8);
1016         }
1017
1018         for (f_code = 1; f_code <= MAX_FCODE; f_code++)
1019             for (mv = -MAX_MV; mv <= MAX_MV; mv++) {
1020                 int len;
1021
1022                 if (mv == 0) {
1023                     len = ff_mpeg12_mbMotionVectorTable[0][1];
1024                 } else {
1025                     int val, bit_size, code;
1026
1027                     bit_size = f_code - 1;
1028
1029                     val = mv;
1030                     if (val < 0)
1031                         val = -val;
1032                     val--;
1033                     code = (val >> bit_size) + 1;
1034                     if (code < 17)
1035                         len = ff_mpeg12_mbMotionVectorTable[code][1] +
1036                               1 + bit_size;
1037                     else
1038                         len = ff_mpeg12_mbMotionVectorTable[16][1] +
1039                               2 + bit_size;
1040                 }
1041
1042                 mv_penalty[f_code][mv + MAX_MV] = len;
1043             }
1044
1045
1046         for (f_code = MAX_FCODE; f_code > 0; f_code--)
1047             for (mv = -(8 << f_code); mv < (8 << f_code); mv++)
1048                 fcode_tab[mv + MAX_MV] = f_code;
1049     }
1050     s->me.mv_penalty = mv_penalty;
1051     s->fcode_tab     = fcode_tab;
1052     if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1053         s->min_qcoeff = -255;
1054         s->max_qcoeff = 255;
1055     } else {
1056         s->min_qcoeff = -2047;
1057         s->max_qcoeff = 2047;
1058     }
1059     if (s->intra_vlc_format) {
1060         s->intra_ac_vlc_length      =
1061         s->intra_ac_vlc_last_length = uni_mpeg2_ac_vlc_len;
1062     } else {
1063         s->intra_ac_vlc_length      =
1064         s->intra_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1065     }
1066     s->inter_ac_vlc_length      =
1067     s->inter_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1068 }
1069
1070 #define OFFSET(x) offsetof(MpegEncContext, x)
1071 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
1072 #define COMMON_OPTS                                                           \
1073     { "gop_timecode",        "MPEG GOP Timecode in hh:mm:ss[:;.]ff format",   \
1074       OFFSET(tc_opt_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, VE },\
1075     { "intra_vlc",           "Use MPEG-2 intra VLC table.",                   \
1076       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE }, \
1077     { "drop_frame_timecode", "Timecode is in drop frame format.",             \
1078       OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE }, \
1079     { "scan_offset",         "Reserve space for SVCD scan offset user data.", \
1080       OFFSET(scan_offset),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1081
1082 static const AVOption mpeg1_options[] = {
1083     COMMON_OPTS
1084     FF_MPV_COMMON_OPTS
1085     { NULL },
1086 };
1087
1088 static const AVOption mpeg2_options[] = {
1089     COMMON_OPTS
1090     { "non_linear_quant", "Use nonlinear quantizer.",    OFFSET(q_scale_type),   AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1091     { "alternate_scan",   "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1092     FF_MPV_COMMON_OPTS
1093     { NULL },
1094 };
1095
1096 #define mpeg12_class(x)                                 \
1097 static const AVClass mpeg ## x ## _class = {            \
1098     .class_name = "mpeg" # x "video encoder",           \
1099     .item_name  = av_default_item_name,                 \
1100     .option     = mpeg ## x ## _options,                \
1101     .version    = LIBAVUTIL_VERSION_INT,                \
1102 };
1103
1104 mpeg12_class(1)
1105 mpeg12_class(2)
1106
1107 AVCodec ff_mpeg1video_encoder = {
1108     .name                 = "mpeg1video",
1109     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
1110     .type                 = AVMEDIA_TYPE_VIDEO,
1111     .id                   = AV_CODEC_ID_MPEG1VIDEO,
1112     .priv_data_size       = sizeof(MpegEncContext),
1113     .init                 = encode_init,
1114     .encode2              = ff_MPV_encode_picture,
1115     .close                = ff_MPV_encode_end,
1116     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
1117     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1118                                                            AV_PIX_FMT_NONE },
1119     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1120     .priv_class           = &mpeg1_class,
1121 };
1122
1123 AVCodec ff_mpeg2video_encoder = {
1124     .name                 = "mpeg2video",
1125     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1126     .type                 = AVMEDIA_TYPE_VIDEO,
1127     .id                   = AV_CODEC_ID_MPEG2VIDEO,
1128     .priv_data_size       = sizeof(MpegEncContext),
1129     .init                 = encode_init,
1130     .encode2              = ff_MPV_encode_picture,
1131     .close                = ff_MPV_encode_end,
1132     .supported_framerates = ff_mpeg2_frame_rate_tab,
1133     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1134                                                            AV_PIX_FMT_YUV422P,
1135                                                            AV_PIX_FMT_NONE },
1136     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1137     .priv_class           = &mpeg2_class,
1138 };