git.sesse.net Git - ffmpeg/blob - libavcodec/mpeg12enc.c

   1 /*
   2  * MPEG1/2 encoder
   3  * Copyright (c) 2000,2001 Fabrice Bellard
   4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This file is part of 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 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 multiples 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 & AV_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     int64_t best_aspect_error = INT64_MAX;
 239     AVRational aspect_ratio = s->avctx->sample_aspect_ratio;
 240
 241     if (aspect_ratio.num == 0 || aspect_ratio.den == 0)
 242         aspect_ratio = (AVRational){1,1};             // 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             int64_t error = aspect_ratio.num * (1LL<<32) / aspect_ratio.den;
 255             if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <= 1)
 256                 error -= (1LL<<32) / ff_mpeg1_aspect[i];
 257             else
 258                 error -= (1LL<<32)*ff_mpeg2_aspect[i].num * s->height / s->width / ff_mpeg2_aspect[i].den;
 259
 260             error = FFABS(error);
 261
 262             if (error - 2 <= 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             AVFrameSideData *side_data;
 310             int width = s->width;
 311             int height = s->height;
 312             int use_seq_disp_ext;
 313
 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             side_data = av_frame_get_side_data(s->current_picture_ptr->f, AV_FRAME_DATA_PANSCAN);
 334             if (side_data) {
 335                 AVPanScan *pan_scan = (AVPanScan *)side_data->data;
 336                 if (pan_scan->width && pan_scan->height) {
 337                     width = pan_scan->width >> 4;
 338                     height = pan_scan->height >> 4;
 339                 }
 340             }
 341
 342             use_seq_disp_ext = (width != s->width ||
 343                                 height != s->height ||
 344                                 s->avctx->color_primaries != AVCOL_PRI_UNSPECIFIED ||
 345                                 s->avctx->color_trc != AVCOL_TRC_UNSPECIFIED ||
 346                                 s->avctx->colorspace != AVCOL_SPC_UNSPECIFIED);
 347
 348             if (s->seq_disp_ext == 1 || (s->seq_disp_ext == -1 && use_seq_disp_ext)) {
 349                 put_header(s, EXT_START_CODE);
 350                 put_bits(&s->pb, 4, 2);                         // sequence display extension
 351                 put_bits(&s->pb, 3, 0);                         // video_format: 0 is components
 352                 put_bits(&s->pb, 1, 1);                         // colour_description
 353                 put_bits(&s->pb, 8, s->avctx->color_primaries); // colour_primaries
 354                 put_bits(&s->pb, 8, s->avctx->color_trc);       // transfer_characteristics
 355                 put_bits(&s->pb, 8, s->avctx->colorspace);      // matrix_coefficients
 356                 put_bits(&s->pb, 14, width);                    // display_horizontal_size
 357                 put_bits(&s->pb, 1, 1);                         // marker_bit
 358                 put_bits(&s->pb, 14, height);                   // display_vertical_size
 359                 put_bits(&s->pb, 3, 0);                         // remaining 3 bits are zero padding
 360             }
 361         }
 362
 363         put_header(s, GOP_START_CODE);
 364         put_bits(&s->pb, 1, s->drop_frame_timecode);    // drop frame flag
 365         /* time code: we must convert from the real frame rate to a
 366          * fake MPEG frame rate in case of low frame rate */
 367         fps       = (framerate.num + framerate.den / 2) / framerate.den;
 368         time_code = s->current_picture_ptr->f->coded_picture_number +
 369                     s->avctx->timecode_frame_start;
 370
 371         s->gop_picture_number = s->current_picture_ptr->f->coded_picture_number;
 372
 373         av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));
 374         if (s->drop_frame_timecode)
 375             time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);
 376
 377         put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 378         put_bits(&s->pb, 6, (uint32_t)((time_code / (fps *   60)) % 60));
 379         put_bits(&s->pb, 1, 1);
 380         put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 381         put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 382         put_bits(&s->pb, 1, !!(s->avctx->flags & AV_CODEC_FLAG_CLOSED_GOP) || s->intra_only || !s->gop_picture_number);
 383         put_bits(&s->pb, 1, 0);                     // broken link
 384     }
 385 }
 386
 387 static inline void encode_mb_skip_run(MpegEncContext *s, int run)
 388 {
 389     while (run >= 33) {
 390         put_bits(&s->pb, 11, 0x008);
 391         run -= 33;
 392     }
 393     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 394              ff_mpeg12_mbAddrIncrTable[run][0]);
 395 }
 396
 397 static av_always_inline void put_qscale(MpegEncContext *s)
 398 {
 399     put_bits(&s->pb, 5, s->qscale);
 400 }
 401
 402 void ff_mpeg1_encode_slice_header(MpegEncContext *s)
 403 {
 404     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
 405         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 406         /* slice_vertical_position_extension */
 407         put_bits(&s->pb, 3, s->mb_y >> 7);
 408     } else {
 409         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 410     }
 411     put_qscale(s);
 412     /* slice extra information */
 413     put_bits(&s->pb, 1, 0);
 414 }
 415
 416 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 417 {
 418     AVFrameSideData *side_data;
 419     mpeg1_encode_sequence_header(s);
 420
 421     /* mpeg1 picture header */
 422     put_header(s, PICTURE_START_CODE);
 423     /* temporal reference */
 424
 425     // RAL: s->picture_number instead of s->fake_picture_number
 426     put_bits(&s->pb, 10,
 427              (s->picture_number - s->gop_picture_number) & 0x3ff);
 428     put_bits(&s->pb, 3, s->pict_type);
 429
 430     s->vbv_delay_ptr = s->pb.buf + put_bits_count(&s->pb) / 8;
 431     put_bits(&s->pb, 16, 0xFFFF);               /* vbv_delay */
 432
 433     // RAL: Forward f_code also needed for B-frames
 434     if (s->pict_type == AV_PICTURE_TYPE_P ||
 435         s->pict_type == AV_PICTURE_TYPE_B) {
 436         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 437         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 438             put_bits(&s->pb, 3, s->f_code);     /* forward_f_code */
 439         else
 440             put_bits(&s->pb, 3, 7);             /* forward_f_code */
 441     }
 442
 443     // RAL: Backward f_code necessary for B-frames
 444     if (s->pict_type == AV_PICTURE_TYPE_B) {
 445         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 446         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 447             put_bits(&s->pb, 3, s->b_code);     /* backward_f_code */
 448         else
 449             put_bits(&s->pb, 3, 7);             /* backward_f_code */
 450     }
 451
 452     put_bits(&s->pb, 1, 0);                     /* extra bit picture */
 453
 454     s->frame_pred_frame_dct = 1;
 455     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 456         put_header(s, EXT_START_CODE);
 457         put_bits(&s->pb, 4, 8);                 /* pic ext */
 458         if (s->pict_type == AV_PICTURE_TYPE_P ||
 459             s->pict_type == AV_PICTURE_TYPE_B) {
 460             put_bits(&s->pb, 4, s->f_code);
 461             put_bits(&s->pb, 4, s->f_code);
 462         } else {
 463             put_bits(&s->pb, 8, 255);
 464         }
 465         if (s->pict_type == AV_PICTURE_TYPE_B) {
 466             put_bits(&s->pb, 4, s->b_code);
 467             put_bits(&s->pb, 4, s->b_code);
 468         } else {
 469             put_bits(&s->pb, 8, 255);
 470         }
 471         put_bits(&s->pb, 2, s->intra_dc_precision);
 472
 473         av_assert0(s->picture_structure == PICT_FRAME);
 474         put_bits(&s->pb, 2, s->picture_structure);
 475         if (s->progressive_sequence)
 476             put_bits(&s->pb, 1, 0);             /* no repeat */
 477         else
 478             put_bits(&s->pb, 1, s->current_picture_ptr->f->top_field_first);
 479         /* XXX: optimize the generation of this flag with entropy measures */
 480         s->frame_pred_frame_dct = s->progressive_sequence;
 481
 482         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 483         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 484         put_bits(&s->pb, 1, s->q_scale_type);
 485         put_bits(&s->pb, 1, s->intra_vlc_format);
 486         put_bits(&s->pb, 1, s->alternate_scan);
 487         put_bits(&s->pb, 1, s->repeat_first_field);
 488         s->progressive_frame = s->progressive_sequence;
 489         /* chroma_420_type */
 490         put_bits(&s->pb, 1, s->chroma_format ==
 491                             CHROMA_420 ? s->progressive_frame : 0);
 492         put_bits(&s->pb, 1, s->progressive_frame);
 493         put_bits(&s->pb, 1, 0);                 /* composite_display_flag */
 494     }
 495     if (s->scan_offset) {
 496         int i;
 497
 498         put_header(s, USER_START_CODE);
 499         for (i = 0; i < sizeof(svcd_scan_offset_placeholder); i++)
 500             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 501     }
 502     side_data = av_frame_get_side_data(s->current_picture_ptr->f,
 503                                        AV_FRAME_DATA_STEREO3D);
 504     if (side_data) {
 505         AVStereo3D *stereo = (AVStereo3D *)side_data->data;
 506         uint8_t fpa_type;
 507
 508         switch (stereo->type) {
 509         case AV_STEREO3D_SIDEBYSIDE:
 510             fpa_type = 0x03;
 511             break;
 512         case AV_STEREO3D_TOPBOTTOM:
 513             fpa_type = 0x04;
 514             break;
 515         case AV_STEREO3D_2D:
 516             fpa_type = 0x08;
 517             break;
 518         case AV_STEREO3D_SIDEBYSIDE_QUINCUNX:
 519             fpa_type = 0x23;
 520             break;
 521         default:
 522             fpa_type = 0;
 523             break;
 524         }
 525
 526         if (fpa_type != 0) {
 527             put_header(s, USER_START_CODE);
 528             put_bits(&s->pb, 8, 'J');   // S3D_video_format_signaling_identifier
 529             put_bits(&s->pb, 8, 'P');
 530             put_bits(&s->pb, 8, '3');
 531             put_bits(&s->pb, 8, 'D');
 532             put_bits(&s->pb, 8, 0x03);  // S3D_video_format_length
 533
 534             put_bits(&s->pb, 1, 1);     // reserved_bit
 535             put_bits(&s->pb, 7, fpa_type); // S3D_video_format_type
 536             put_bits(&s->pb, 8, 0x04);  // reserved_data[0]
 537             put_bits(&s->pb, 8, 0xFF);  // reserved_data[1]
 538         }
 539     }
 540
 541     s->mb_y = 0;
 542     ff_mpeg1_encode_slice_header(s);
 543 }
 544
 545 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 546                                 int has_mv, int field_motion)
 547 {
 548     put_bits(&s->pb, n, bits);
 549     if (!s->frame_pred_frame_dct) {
 550         if (has_mv)
 551             /* motion_type: frame/field */
 552             put_bits(&s->pb, 2, 2 - field_motion);
 553         put_bits(&s->pb, 1, s->interlaced_dct);
 554     }
 555 }
 556
 557 // RAL: Parameter added: f_or_b_code
 558 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 559 {
 560     if (val == 0) {
 561         /* zero vector */
 562         put_bits(&s->pb,
 563                  ff_mpeg12_mbMotionVectorTable[0][1],
 564                  ff_mpeg12_mbMotionVectorTable[0][0]);
 565     } else {
 566         int code, sign, bits;
 567         int bit_size = f_or_b_code - 1;
 568         int range    = 1 << bit_size;
 569         /* modulo encoding */
 570         val = sign_extend(val, 5 + bit_size);
 571
 572         if (val >= 0) {
 573             val--;
 574             code = (val >> bit_size) + 1;
 575             bits = val & (range - 1);
 576             sign = 0;
 577         } else {
 578             val = -val;
 579             val--;
 580             code = (val >> bit_size) + 1;
 581             bits = val & (range - 1);
 582             sign = 1;
 583         }
 584
 585         av_assert2(code > 0 && code <= 16);
 586
 587         put_bits(&s->pb,
 588                  ff_mpeg12_mbMotionVectorTable[code][1],
 589                  ff_mpeg12_mbMotionVectorTable[code][0]);
 590
 591         put_bits(&s->pb, 1, sign);
 592         if (bit_size > 0)
 593             put_bits(&s->pb, bit_size, bits);
 594     }
 595 }
 596
 597 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 598 {
 599     unsigned int diff_u = diff + 255;
 600     if (diff_u >= 511) {
 601         int index;
 602
 603         if (diff < 0) {
 604             index = av_log2_16bit(-2 * diff);
 605             diff--;
 606         } else {
 607             index = av_log2_16bit(2 * diff);
 608         }
 609         if (component == 0)
 610             put_bits(&s->pb,
 611                      ff_mpeg12_vlc_dc_lum_bits[index] + index,
 612                      (ff_mpeg12_vlc_dc_lum_code[index] << index) +
 613                      av_mod_uintp2(diff, index));
 614         else
 615             put_bits(&s->pb,
 616                      ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 617                      (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
 618                      av_mod_uintp2(diff, index));
 619     } else {
 620         if (component == 0)
 621             put_bits(&s->pb,
 622                      mpeg1_lum_dc_uni[diff + 255] & 0xFF,
 623                      mpeg1_lum_dc_uni[diff + 255] >> 8);
 624         else
 625             put_bits(&s->pb,
 626                      mpeg1_chr_dc_uni[diff + 255] & 0xFF,
 627                      mpeg1_chr_dc_uni[diff + 255] >> 8);
 628     }
 629 }
 630
 631 static void mpeg1_encode_block(MpegEncContext *s, int16_t *block, int n)
 632 {
 633     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 634     int code, component;
 635     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 636
 637     last_index = s->block_last_index[n];
 638
 639     /* DC coef */
 640     if (s->mb_intra) {
 641         component = (n <= 3 ? 0 : (n & 1) + 1);
 642         dc        = block[0];                   /* overflow is impossible */
 643         diff      = dc - s->last_dc[component];
 644         encode_dc(s, diff, component);
 645         s->last_dc[component] = dc;
 646         i = 1;
 647         if (s->intra_vlc_format)
 648             table_vlc = ff_rl_mpeg2.table_vlc;
 649     } else {
 650         /* encode the first coefficient: needs to be done here because
 651          * it is handled slightly differently */
 652         level = block[0];
 653         if (abs(level) == 1) {
 654             code = ((uint32_t)level >> 31);     /* the sign bit */
 655             put_bits(&s->pb, 2, code | 0x02);
 656             i = 1;
 657         } else {
 658             i             = 0;
 659             last_non_zero = -1;
 660             goto next_coef;
 661         }
 662     }
 663
 664     /* now quantify & encode AC coefs */
 665     last_non_zero = i - 1;
 666
 667     for (; i <= last_index; i++) {
 668         j     = s->intra_scantable.permutated[i];
 669         level = block[j];
 670
 671 next_coef:
 672         /* encode using VLC */
 673         if (level != 0) {
 674             run = i - last_non_zero - 1;
 675
 676             alevel = level;
 677             MASK_ABS(sign, alevel);
 678             sign &= 1;
 679
 680             if (alevel <= mpeg1_max_level[0][run]) {
 681                 code = mpeg1_index_run[0][run] + alevel - 1;
 682                 /* store the VLC & sign at once */
 683                 put_bits(&s->pb, table_vlc[code][1] + 1,
 684                          (table_vlc[code][0] << 1) + sign);
 685             } else {
 686                 /* escape seems to be pretty rare <5% so I do not optimize it */
 687                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 688                 /* escape: only clip in this case */
 689                 put_bits(&s->pb, 6, run);
 690                 if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
 691                     if (alevel < 128) {
 692                         put_sbits(&s->pb, 8, level);
 693                     } else {
 694                         if (level < 0)
 695                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 696                         else
 697                             put_sbits(&s->pb, 16, level);
 698                     }
 699                 } else {
 700                     put_sbits(&s->pb, 12, level);
 701                 }
 702             }
 703             last_non_zero = i;
 704         }
 705     }
 706     /* end of block */
 707     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 708 }
 709
 710 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 711                                                       int16_t block[8][64],
 712                                                       int motion_x, int motion_y,
 713                                                       int mb_block_count)
 714 {
 715     int i, cbp;
 716     const int mb_x     = s->mb_x;
 717     const int mb_y     = s->mb_y;
 718     const int first_mb = mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 719
 720     /* compute cbp */
 721     cbp = 0;
 722     for (i = 0; i < mb_block_count; i++)
 723         if (s->block_last_index[i] >= 0)
 724             cbp |= 1 << (mb_block_count - 1 - i);
 725
 726     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 727         (mb_x != s->mb_width - 1 ||
 728          (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
 729         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 730          (s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir &&
 731           (((s->mv_dir & MV_DIR_FORWARD)
 732             ? ((s->mv[0][0][0] - s->last_mv[0][0][0]) |
 733                (s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
 734            ((s->mv_dir & MV_DIR_BACKWARD)
 735             ? ((s->mv[1][0][0] - s->last_mv[1][0][0]) |
 736                (s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
 737         s->mb_skip_run++;
 738         s->qscale -= s->dquant;
 739         s->skip_count++;
 740         s->misc_bits++;
 741         s->last_bits++;
 742         if (s->pict_type == AV_PICTURE_TYPE_P) {
 743             s->last_mv[0][0][0] =
 744             s->last_mv[0][0][1] =
 745             s->last_mv[0][1][0] =
 746             s->last_mv[0][1][1] = 0;
 747         }
 748     } else {
 749         if (first_mb) {
 750             av_assert0(s->mb_skip_run == 0);
 751             encode_mb_skip_run(s, s->mb_x);
 752         } else {
 753             encode_mb_skip_run(s, s->mb_skip_run);
 754         }
 755
 756         if (s->pict_type == AV_PICTURE_TYPE_I) {
 757             if (s->dquant && cbp) {
 758                 /* macroblock_type: macroblock_quant = 1 */
 759                 put_mb_modes(s, 2, 1, 0, 0);
 760                 put_qscale(s);
 761             } else {
 762                 /* macroblock_type: macroblock_quant = 0 */
 763                 put_mb_modes(s, 1, 1, 0, 0);
 764                 s->qscale -= s->dquant;
 765             }
 766             s->misc_bits += get_bits_diff(s);
 767             s->i_count++;
 768         } else if (s->mb_intra) {
 769             if (s->dquant && cbp) {
 770                 put_mb_modes(s, 6, 0x01, 0, 0);
 771                 put_qscale(s);
 772             } else {
 773                 put_mb_modes(s, 5, 0x03, 0, 0);
 774                 s->qscale -= s->dquant;
 775             }
 776             s->misc_bits += get_bits_diff(s);
 777             s->i_count++;
 778             memset(s->last_mv, 0, sizeof(s->last_mv));
 779         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 780             if (s->mv_type == MV_TYPE_16X16) {
 781                 if (cbp != 0) {
 782                     if ((motion_x | motion_y) == 0) {
 783                         if (s->dquant) {
 784                             /* macroblock_pattern & quant */
 785                             put_mb_modes(s, 5, 1, 0, 0);
 786                             put_qscale(s);
 787                         } else {
 788                             /* macroblock_pattern only */
 789                             put_mb_modes(s, 2, 1, 0, 0);
 790                         }
 791                         s->misc_bits += get_bits_diff(s);
 792                     } else {
 793                         if (s->dquant) {
 794                             put_mb_modes(s, 5, 2, 1, 0);    /* motion + cbp */
 795                             put_qscale(s);
 796                         } else {
 797                             put_mb_modes(s, 1, 1, 1, 0);    /* motion + cbp */
 798                         }
 799                         s->misc_bits += get_bits_diff(s);
 800                         // RAL: f_code parameter added
 801                         mpeg1_encode_motion(s,
 802                                             motion_x - s->last_mv[0][0][0],
 803                                             s->f_code);
 804                         // RAL: f_code parameter added
 805                         mpeg1_encode_motion(s,
 806                                             motion_y - s->last_mv[0][0][1],
 807                                             s->f_code);
 808                         s->mv_bits += get_bits_diff(s);
 809                     }
 810                 } else {
 811                     put_bits(&s->pb, 3, 1);         /* motion only */
 812                     if (!s->frame_pred_frame_dct)
 813                         put_bits(&s->pb, 2, 2);     /* motion_type: frame */
 814                     s->misc_bits += get_bits_diff(s);
 815                     // RAL: f_code parameter added
 816                     mpeg1_encode_motion(s,
 817                                         motion_x - s->last_mv[0][0][0],
 818                                         s->f_code);
 819                     // RAL: f_code parameter added
 820                     mpeg1_encode_motion(s,
 821                                         motion_y - s->last_mv[0][0][1],
 822                                         s->f_code);
 823                     s->qscale  -= s->dquant;
 824                     s->mv_bits += get_bits_diff(s);
 825                 }
 826                 s->last_mv[0][1][0] = s->last_mv[0][0][0] = motion_x;
 827                 s->last_mv[0][1][1] = s->last_mv[0][0][1] = motion_y;
 828             } else {
 829                 av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 830
 831                 if (cbp) {
 832                     if (s->dquant) {
 833                         put_mb_modes(s, 5, 2, 1, 1);    /* motion + cbp */
 834                         put_qscale(s);
 835                     } else {
 836                         put_mb_modes(s, 1, 1, 1, 1);    /* motion + cbp */
 837                     }
 838                 } else {
 839                     put_bits(&s->pb, 3, 1);             /* motion only */
 840                     put_bits(&s->pb, 2, 1);             /* motion_type: field */
 841                     s->qscale -= s->dquant;
 842                 }
 843                 s->misc_bits += get_bits_diff(s);
 844                 for (i = 0; i < 2; i++) {
 845                     put_bits(&s->pb, 1, s->field_select[0][i]);
 846                     mpeg1_encode_motion(s,
 847                                         s->mv[0][i][0] - s->last_mv[0][i][0],
 848                                         s->f_code);
 849                     mpeg1_encode_motion(s,
 850                                         s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 851                                         s->f_code);
 852                     s->last_mv[0][i][0] = s->mv[0][i][0];
 853                     s->last_mv[0][i][1] = 2 * s->mv[0][i][1];
 854                 }
 855                 s->mv_bits += get_bits_diff(s);
 856             }
 857             if (cbp) {
 858                 if (s->chroma_y_shift) {
 859                     put_bits(&s->pb,
 860                              ff_mpeg12_mbPatTable[cbp][1],
 861                              ff_mpeg12_mbPatTable[cbp][0]);
 862                 } else {
 863                     put_bits(&s->pb,
 864                              ff_mpeg12_mbPatTable[cbp >> 2][1],
 865                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
 866                     put_sbits(&s->pb, 2, cbp);
 867                 }
 868             }
 869             s->f_count++;
 870         } else {
 871             if (s->mv_type == MV_TYPE_16X16) {
 872                 if (cbp) {                      // With coded bloc pattern
 873                     if (s->dquant) {
 874                         if (s->mv_dir == MV_DIR_FORWARD)
 875                             put_mb_modes(s, 6, 3, 1, 0);
 876                         else
 877                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 0);
 878                         put_qscale(s);
 879                     } else {
 880                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 0);
 881                     }
 882                 } else {                        // No coded bloc pattern
 883                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 884                     if (!s->frame_pred_frame_dct)
 885                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 886                     s->qscale -= s->dquant;
 887                 }
 888                 s->misc_bits += get_bits_diff(s);
 889                 if (s->mv_dir & MV_DIR_FORWARD) {
 890                     mpeg1_encode_motion(s,
 891                                         s->mv[0][0][0] - s->last_mv[0][0][0],
 892                                         s->f_code);
 893                     mpeg1_encode_motion(s,
 894                                         s->mv[0][0][1] - s->last_mv[0][0][1],
 895                                         s->f_code);
 896                     s->last_mv[0][0][0] =
 897                     s->last_mv[0][1][0] = s->mv[0][0][0];
 898                     s->last_mv[0][0][1] =
 899                     s->last_mv[0][1][1] = s->mv[0][0][1];
 900                     s->f_count++;
 901                 }
 902                 if (s->mv_dir & MV_DIR_BACKWARD) {
 903                     mpeg1_encode_motion(s,
 904                                         s->mv[1][0][0] - s->last_mv[1][0][0],
 905                                         s->b_code);
 906                     mpeg1_encode_motion(s,
 907                                         s->mv[1][0][1] - s->last_mv[1][0][1],
 908                                         s->b_code);
 909                     s->last_mv[1][0][0] =
 910                     s->last_mv[1][1][0] = s->mv[1][0][0];
 911                     s->last_mv[1][0][1] =
 912                     s->last_mv[1][1][1] = s->mv[1][0][1];
 913                     s->b_count++;
 914                 }
 915             } else {
 916                 av_assert2(s->mv_type == MV_TYPE_FIELD);
 917                 av_assert2(!s->frame_pred_frame_dct);
 918                 if (cbp) {                      // With coded bloc pattern
 919                     if (s->dquant) {
 920                         if (s->mv_dir == MV_DIR_FORWARD)
 921                             put_mb_modes(s, 6, 3, 1, 1);
 922                         else
 923                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 1);
 924                         put_qscale(s);
 925                     } else {
 926                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 1);
 927                     }
 928                 } else {                        // No coded bloc pattern
 929                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 930                     put_bits(&s->pb, 2, 1);     /* motion_type: field */
 931                     s->qscale -= s->dquant;
 932                 }
 933                 s->misc_bits += get_bits_diff(s);
 934                 if (s->mv_dir & MV_DIR_FORWARD) {
 935                     for (i = 0; i < 2; i++) {
 936                         put_bits(&s->pb, 1, s->field_select[0][i]);
 937                         mpeg1_encode_motion(s,
 938                                             s->mv[0][i][0] - s->last_mv[0][i][0],
 939                                             s->f_code);
 940                         mpeg1_encode_motion(s,
 941                                             s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 942                                             s->f_code);
 943                         s->last_mv[0][i][0] = s->mv[0][i][0];
 944                         s->last_mv[0][i][1] = s->mv[0][i][1] * 2;
 945                     }
 946                     s->f_count++;
 947                 }
 948                 if (s->mv_dir & MV_DIR_BACKWARD) {
 949                     for (i = 0; i < 2; i++) {
 950                         put_bits(&s->pb, 1, s->field_select[1][i]);
 951                         mpeg1_encode_motion(s,
 952                                             s->mv[1][i][0] - s->last_mv[1][i][0],
 953                                             s->b_code);
 954                         mpeg1_encode_motion(s,
 955                                             s->mv[1][i][1] - (s->last_mv[1][i][1] >> 1),
 956                                             s->b_code);
 957                         s->last_mv[1][i][0] = s->mv[1][i][0];
 958                         s->last_mv[1][i][1] = s->mv[1][i][1] * 2;
 959                     }
 960                     s->b_count++;
 961                 }
 962             }
 963             s->mv_bits += get_bits_diff(s);
 964             if (cbp) {
 965                 if (s->chroma_y_shift) {
 966                     put_bits(&s->pb,
 967                              ff_mpeg12_mbPatTable[cbp][1],
 968                              ff_mpeg12_mbPatTable[cbp][0]);
 969                 } else {
 970                     put_bits(&s->pb,
 971                              ff_mpeg12_mbPatTable[cbp >> 2][1],
 972                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
 973                     put_sbits(&s->pb, 2, cbp);
 974                 }
 975             }
 976         }
 977         for (i = 0; i < mb_block_count; i++)
 978             if (cbp & (1 << (mb_block_count - 1 - i)))
 979                 mpeg1_encode_block(s, block[i], i);
 980         s->mb_skip_run = 0;
 981         if (s->mb_intra)
 982             s->i_tex_bits += get_bits_diff(s);
 983         else
 984             s->p_tex_bits += get_bits_diff(s);
 985     }
 986 }
 987
 988 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
 989                         int motion_x, int motion_y)
 990 {
 991     if (s->chroma_format == CHROMA_420)
 992         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 993     else
 994         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 995 }
 996
 997 av_cold void ff_mpeg1_encode_init(MpegEncContext *s)
 998 {
 999     static int done = 0;
1000
1001     ff_mpeg12_common_init(s);
1002
1003     if (!done) {
1004         int f_code;
1005         int mv;
1006         int i;
1007
1008         done = 1;
1009         ff_rl_init(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
1010         ff_rl_init(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
1011
1012         for (i = 0; i < 64; i++) {
1013             mpeg1_max_level[0][i] = ff_rl_mpeg1.max_level[0][i];
1014             mpeg1_index_run[0][i] = ff_rl_mpeg1.index_run[0][i];
1015         }
1016
1017         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
1018         if (s->intra_vlc_format)
1019             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
1020
1021         /* build unified dc encoding tables */
1022         for (i = -255; i < 256; i++) {
1023             int adiff, index;
1024             int bits, code;
1025             int diff = i;
1026
1027             adiff = FFABS(diff);
1028             if (diff < 0)
1029                 diff--;
1030             index = av_log2(2 * adiff);
1031
1032             bits = ff_mpeg12_vlc_dc_lum_bits[index] + index;
1033             code = (ff_mpeg12_vlc_dc_lum_code[index] << index) +
1034                     av_mod_uintp2(diff, index);
1035             mpeg1_lum_dc_uni[i + 255] = bits + (code << 8);
1036
1037             bits = ff_mpeg12_vlc_dc_chroma_bits[index] + index;
1038             code = (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
1039                     av_mod_uintp2(diff, index);
1040             mpeg1_chr_dc_uni[i + 255] = bits + (code << 8);
1041         }
1042
1043         for (f_code = 1; f_code <= MAX_FCODE; f_code++)
1044             for (mv = -MAX_MV; mv <= MAX_MV; mv++) {
1045                 int len;
1046
1047                 if (mv == 0) {
1048                     len = ff_mpeg12_mbMotionVectorTable[0][1];
1049                 } else {
1050                     int val, bit_size, code;
1051
1052                     bit_size = f_code - 1;
1053
1054                     val = mv;
1055                     if (val < 0)
1056                         val = -val;
1057                     val--;
1058                     code = (val >> bit_size) + 1;
1059                     if (code < 17)
1060                         len = ff_mpeg12_mbMotionVectorTable[code][1] +
1061                               1 + bit_size;
1062                     else
1063                         len = ff_mpeg12_mbMotionVectorTable[16][1] +
1064                               2 + bit_size;
1065                 }
1066
1067                 mv_penalty[f_code][mv + MAX_MV] = len;
1068             }
1069
1070
1071         for (f_code = MAX_FCODE; f_code > 0; f_code--)
1072             for (mv = -(8 << f_code); mv < (8 << f_code); mv++)
1073                 fcode_tab[mv + MAX_MV] = f_code;
1074     }
1075     s->me.mv_penalty = mv_penalty;
1076     s->fcode_tab     = fcode_tab;
1077     if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1078         s->min_qcoeff = -255;
1079         s->max_qcoeff = 255;
1080     } else {
1081         s->min_qcoeff = -2047;
1082         s->max_qcoeff = 2047;
1083     }
1084     if (s->intra_vlc_format) {
1085         s->intra_ac_vlc_length      =
1086         s->intra_ac_vlc_last_length = uni_mpeg2_ac_vlc_len;
1087     } else {
1088         s->intra_ac_vlc_length      =
1089         s->intra_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1090     }
1091     s->inter_ac_vlc_length      =
1092     s->inter_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1093 }
1094
1095 #define OFFSET(x) offsetof(MpegEncContext, x)
1096 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
1097 #define COMMON_OPTS                                                           \
1098     { "gop_timecode",        "MPEG GOP Timecode in hh:mm:ss[:;.]ff format",   \
1099       OFFSET(tc_opt_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, VE },\
1100     { "intra_vlc",           "Use MPEG-2 intra VLC table.",                   \
1101       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE }, \
1102     { "drop_frame_timecode", "Timecode is in drop frame format.",             \
1103       OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE }, \
1104     { "scan_offset",         "Reserve space for SVCD scan offset user data.", \
1105       OFFSET(scan_offset),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1106
1107 static const AVOption mpeg1_options[] = {
1108     COMMON_OPTS
1109     FF_MPV_COMMON_OPTS
1110     { NULL },
1111 };
1112
1113 static const AVOption mpeg2_options[] = {
1114     COMMON_OPTS
1115     { "non_linear_quant", "Use nonlinear quantizer.",    OFFSET(q_scale_type),   AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1116     { "alternate_scan",   "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1117     { "seq_disp_ext",     "Write sequence_display_extension blocks.", OFFSET(seq_disp_ext), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE, "seq_disp_ext" },
1118     {     "auto",   NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = -1},  0, 0, VE, "seq_disp_ext" },
1119     {     "never",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 0 },  0, 0, VE, "seq_disp_ext" },
1120     {     "always", NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 1 },  0, 0, VE, "seq_disp_ext" },
1121     FF_MPV_COMMON_OPTS
1122     { NULL },
1123 };
1124
1125 #define mpeg12_class(x)                                 \
1126 static const AVClass mpeg ## x ## _class = {            \
1127     .class_name = "mpeg" # x "video encoder",           \
1128     .item_name  = av_default_item_name,                 \
1129     .option     = mpeg ## x ## _options,                \
1130     .version    = LIBAVUTIL_VERSION_INT,                \
1131 };
1132
1133 mpeg12_class(1)
1134 mpeg12_class(2)
1135
1136 AVCodec ff_mpeg1video_encoder = {
1137     .name                 = "mpeg1video",
1138     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
1139     .type                 = AVMEDIA_TYPE_VIDEO,
1140     .id                   = AV_CODEC_ID_MPEG1VIDEO,
1141     .priv_data_size       = sizeof(MpegEncContext),
1142     .init                 = encode_init,
1143     .encode2              = ff_mpv_encode_picture,
1144     .close                = ff_mpv_encode_end,
1145     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
1146     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1147                                                            AV_PIX_FMT_NONE },
1148     .capabilities         = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
1149     .priv_class           = &mpeg1_class,
1150 };
1151
1152 AVCodec ff_mpeg2video_encoder = {
1153     .name                 = "mpeg2video",
1154     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1155     .type                 = AVMEDIA_TYPE_VIDEO,
1156     .id                   = AV_CODEC_ID_MPEG2VIDEO,
1157     .priv_data_size       = sizeof(MpegEncContext),
1158     .init                 = encode_init,
1159     .encode2              = ff_mpv_encode_picture,
1160     .close                = ff_mpv_encode_end,
1161     .supported_framerates = ff_mpeg2_frame_rate_tab,
1162     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1163                                                            AV_PIX_FMT_YUV422P,
1164                                                            AV_PIX_FMT_NONE },
1165     .capabilities         = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
1166     .priv_class           = &mpeg2_class,
1167 };