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

   1 /*
   2  * MPEG-1/2 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  * MPEG-1/2 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_DMV * 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 (ff_mpv_encode_init(avctx) < 0)
 143         return -1;
 144
 145     if (find_frame_rate_index(s) < 0) {
 146         if (s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
 147             av_log(avctx, AV_LOG_ERROR, "MPEG-1/2 does not support %d/%d fps\n",
 148                    avctx->time_base.den, avctx->time_base.num);
 149             return -1;
 150         } else {
 151             av_log(avctx, AV_LOG_INFO,
 152                    "MPEG-1/2 does not support %d/%d fps, there may be AV sync issues\n",
 153                    avctx->time_base.den, avctx->time_base.num);
 154         }
 155     }
 156
 157     if (avctx->profile == FF_PROFILE_UNKNOWN) {
 158         if (avctx->level != FF_LEVEL_UNKNOWN) {
 159             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 160             return -1;
 161         }
 162         /* Main or 4:2:2 */
 163         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0;
 164     }
 165
 166     if (avctx->level == FF_LEVEL_UNKNOWN) {
 167         if (avctx->profile == 0) {                  /* 4:2:2 */
 168             if (avctx->width <= 720 && avctx->height <= 608)
 169                 avctx->level = 5;                   /* Main */
 170             else
 171                 avctx->level = 2;                   /* High */
 172         } else {
 173             if (avctx->profile != 1 && s->chroma_format != CHROMA_420) {
 174                 av_log(avctx, AV_LOG_ERROR,
 175                        "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 176                 return -1;
 177             }
 178             if (avctx->width <= 720 && avctx->height <= 576)
 179                 avctx->level = 8;                   /* Main */
 180             else if (avctx->width <= 1440)
 181                 avctx->level = 6;                   /* High 1440 */
 182             else
 183                 avctx->level = 4;                   /* High */
 184         }
 185     }
 186
 187     if ((avctx->width & 0xFFF) == 0 && (avctx->height & 0xFFF) == 1) {
 188         av_log(avctx, AV_LOG_ERROR, "Width / Height is invalid for MPEG2\n");
 189         return AVERROR(EINVAL);
 190     }
 191
 192     if (s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
 193         if ((avctx->width & 0xFFF) == 0 || (avctx->height & 0xFFF) == 0) {
 194             av_log(avctx, AV_LOG_ERROR, "Width or Height are not allowed to be multiples of 4096\n"
 195                                         "add '-strict %d' if you want to use them anyway.\n", FF_COMPLIANCE_UNOFFICIAL);
 196             return AVERROR(EINVAL);
 197         }
 198     }
 199
 200     s->drop_frame_timecode = s->drop_frame_timecode || !!(avctx->flags2 & AV_CODEC_FLAG2_DROP_FRAME_TIMECODE);
 201     if (s->drop_frame_timecode)
 202         s->tc.flags |= AV_TIMECODE_FLAG_DROPFRAME;
 203     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 204         av_log(avctx, AV_LOG_ERROR,
 205                "Drop frame time code only allowed with 1001/30000 fps\n");
 206         return -1;
 207     }
 208
 209 #if FF_API_PRIVATE_OPT
 210 FF_DISABLE_DEPRECATION_WARNINGS
 211     if (avctx->timecode_frame_start)
 212         s->timecode_frame_start = avctx->timecode_frame_start;
 213 FF_ENABLE_DEPRECATION_WARNINGS
 214 #endif
 215
 216     if (s->tc_opt_str) {
 217         AVRational rate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 218         int ret = av_timecode_init_from_string(&s->tc, rate, s->tc_opt_str, s);
 219         if (ret < 0)
 220             return ret;
 221         s->drop_frame_timecode = !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME);
 222         s->timecode_frame_start = s->tc.start;
 223     } else {
 224         s->timecode_frame_start = 0; // default is -1
 225     }
 226
 227     return 0;
 228 }
 229
 230 static void put_header(MpegEncContext *s, int header)
 231 {
 232     avpriv_align_put_bits(&s->pb);
 233     put_bits(&s->pb, 16, header >> 16);
 234     put_sbits(&s->pb, 16, header);
 235 }
 236
 237 /* put sequence header if needed */
 238 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 239 {
 240     unsigned int vbv_buffer_size, fps, v;
 241     int i, constraint_parameter_flag;
 242     uint64_t time_code;
 243     int64_t best_aspect_error = INT64_MAX;
 244     AVRational aspect_ratio = s->avctx->sample_aspect_ratio;
 245
 246     if (aspect_ratio.num == 0 || aspect_ratio.den == 0)
 247         aspect_ratio = (AVRational){1,1};             // pixel aspect 1.1 (VGA)
 248
 249     if (s->current_picture.f->key_frame) {
 250         AVRational framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 251
 252         /* MPEG-1 header repeated every GOP */
 253         put_header(s, SEQ_START_CODE);
 254
 255         put_sbits(&s->pb, 12, s->width  & 0xFFF);
 256         put_sbits(&s->pb, 12, s->height & 0xFFF);
 257
 258         for (i = 1; i < 15; i++) {
 259             int64_t error = aspect_ratio.num * (1LL<<32) / aspect_ratio.den;
 260             if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <= 1)
 261                 error -= (1LL<<32) / ff_mpeg1_aspect[i];
 262             else
 263                 error -= (1LL<<32)*ff_mpeg2_aspect[i].num * s->height / s->width / ff_mpeg2_aspect[i].den;
 264
 265             error = FFABS(error);
 266
 267             if (error - 2 <= best_aspect_error) {
 268                 best_aspect_error    = error;
 269                 s->aspect_ratio_info = i;
 270             }
 271         }
 272
 273         put_bits(&s->pb, 4, s->aspect_ratio_info);
 274         put_bits(&s->pb, 4, s->frame_rate_index);
 275
 276         if (s->avctx->rc_max_rate) {
 277             v = (s->avctx->rc_max_rate + 399) / 400;
 278             if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 279                 v = 0x3ffff;
 280         } else {
 281             v = 0x3FFFF;
 282         }
 283
 284         if (s->avctx->rc_buffer_size)
 285             vbv_buffer_size = s->avctx->rc_buffer_size;
 286         else
 287             /* VBV calculation: Scaled so that a VCD has the proper
 288              * VBV size of 40 kilobytes */
 289             vbv_buffer_size = ((20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 290         vbv_buffer_size = (vbv_buffer_size + 16383) / 16384;
 291
 292         put_sbits(&s->pb, 18, v);
 293         put_bits(&s->pb, 1, 1);         // marker
 294         put_sbits(&s->pb, 10, vbv_buffer_size);
 295
 296         constraint_parameter_flag =
 297             s->width  <= 768                                    &&
 298             s->height <= 576                                    &&
 299             s->mb_width * s->mb_height                 <= 396   &&
 300             s->mb_width * s->mb_height * framerate.num <= 396 * 25 * framerate.den &&
 301             framerate.num <= framerate.den * 30                 &&
 302             s->avctx->me_range                                  &&
 303             s->avctx->me_range < 128                            &&
 304             vbv_buffer_size <= 20                               &&
 305             v <= 1856000 / 400                                  &&
 306             s->codec_id == AV_CODEC_ID_MPEG1VIDEO;
 307
 308         put_bits(&s->pb, 1, constraint_parameter_flag);
 309
 310         ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 311         ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 312
 313         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 314             AVFrameSideData *side_data;
 315             int width = s->width;
 316             int height = s->height;
 317             int use_seq_disp_ext;
 318
 319             put_header(s, EXT_START_CODE);
 320             put_bits(&s->pb, 4, 1);                 // seq ext
 321
 322             put_bits(&s->pb, 1, s->avctx->profile == 0); // escx 1 for 4:2:2 profile
 323
 324             put_bits(&s->pb, 3, s->avctx->profile); // profile
 325             put_bits(&s->pb, 4, s->avctx->level);   // level
 326
 327             put_bits(&s->pb, 1, s->progressive_sequence);
 328             put_bits(&s->pb, 2, s->chroma_format);
 329             put_bits(&s->pb, 2, s->width  >> 12);
 330             put_bits(&s->pb, 2, s->height >> 12);
 331             put_bits(&s->pb, 12, v >> 18);          // bitrate ext
 332             put_bits(&s->pb, 1, 1);                 // marker
 333             put_bits(&s->pb, 8, vbv_buffer_size >> 10); // vbv buffer ext
 334             put_bits(&s->pb, 1, s->low_delay);
 335             put_bits(&s->pb, 2, s->mpeg2_frame_rate_ext.num-1); // frame_rate_ext_n
 336             put_bits(&s->pb, 5, s->mpeg2_frame_rate_ext.den-1); // frame_rate_ext_d
 337
 338             side_data = av_frame_get_side_data(s->current_picture_ptr->f, AV_FRAME_DATA_PANSCAN);
 339             if (side_data) {
 340                 AVPanScan *pan_scan = (AVPanScan *)side_data->data;
 341                 if (pan_scan->width && pan_scan->height) {
 342                     width = pan_scan->width >> 4;
 343                     height = pan_scan->height >> 4;
 344                 }
 345             }
 346
 347             use_seq_disp_ext = (width != s->width ||
 348                                 height != s->height ||
 349                                 s->avctx->color_primaries != AVCOL_PRI_UNSPECIFIED ||
 350                                 s->avctx->color_trc != AVCOL_TRC_UNSPECIFIED ||
 351                                 s->avctx->colorspace != AVCOL_SPC_UNSPECIFIED ||
 352                                 s->video_format != VIDEO_FORMAT_UNSPECIFIED);
 353
 354             if (s->seq_disp_ext == 1 || (s->seq_disp_ext == -1 && use_seq_disp_ext)) {
 355                 put_header(s, EXT_START_CODE);
 356                 put_bits(&s->pb, 4, 2);                         // sequence display extension
 357                 put_bits(&s->pb, 3, s->video_format);           // video_format
 358                 put_bits(&s->pb, 1, 1);                         // colour_description
 359                 put_bits(&s->pb, 8, s->avctx->color_primaries); // colour_primaries
 360                 put_bits(&s->pb, 8, s->avctx->color_trc);       // transfer_characteristics
 361                 put_bits(&s->pb, 8, s->avctx->colorspace);      // matrix_coefficients
 362                 put_bits(&s->pb, 14, width);                    // display_horizontal_size
 363                 put_bits(&s->pb, 1, 1);                         // marker_bit
 364                 put_bits(&s->pb, 14, height);                   // display_vertical_size
 365                 put_bits(&s->pb, 3, 0);                         // remaining 3 bits are zero padding
 366             }
 367         }
 368
 369         put_header(s, GOP_START_CODE);
 370         put_bits(&s->pb, 1, s->drop_frame_timecode);    // drop frame flag
 371         /* time code: we must convert from the real frame rate to a
 372          * fake MPEG frame rate in case of low frame rate */
 373         fps       = (framerate.num + framerate.den / 2) / framerate.den;
 374         time_code = s->current_picture_ptr->f->coded_picture_number +
 375                     s->timecode_frame_start;
 376
 377         s->gop_picture_number = s->current_picture_ptr->f->coded_picture_number;
 378
 379         av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));
 380         if (s->drop_frame_timecode)
 381             time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);
 382
 383         put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 384         put_bits(&s->pb, 6, (uint32_t)((time_code / (fps *   60)) % 60));
 385         put_bits(&s->pb, 1, 1);
 386         put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 387         put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 388         put_bits(&s->pb, 1, !!(s->avctx->flags & AV_CODEC_FLAG_CLOSED_GOP) || s->intra_only || !s->gop_picture_number);
 389         put_bits(&s->pb, 1, 0);                     // broken link
 390     }
 391 }
 392
 393 static inline void encode_mb_skip_run(MpegEncContext *s, int run)
 394 {
 395     while (run >= 33) {
 396         put_bits(&s->pb, 11, 0x008);
 397         run -= 33;
 398     }
 399     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 400              ff_mpeg12_mbAddrIncrTable[run][0]);
 401 }
 402
 403 static av_always_inline void put_qscale(MpegEncContext *s)
 404 {
 405     put_bits(&s->pb, 5, s->qscale);
 406 }
 407
 408 void ff_mpeg1_encode_slice_header(MpegEncContext *s)
 409 {
 410     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
 411         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 412         /* slice_vertical_position_extension */
 413         put_bits(&s->pb, 3, s->mb_y >> 7);
 414     } else {
 415         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 416     }
 417     put_qscale(s);
 418     /* slice extra information */
 419     put_bits(&s->pb, 1, 0);
 420 }
 421
 422 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 423 {
 424     AVFrameSideData *side_data;
 425     mpeg1_encode_sequence_header(s);
 426
 427     /* MPEG-1 picture header */
 428     put_header(s, PICTURE_START_CODE);
 429     /* temporal reference */
 430
 431     // RAL: s->picture_number instead of s->fake_picture_number
 432     put_bits(&s->pb, 10,
 433              (s->picture_number - s->gop_picture_number) & 0x3ff);
 434     put_bits(&s->pb, 3, s->pict_type);
 435
 436     s->vbv_delay_ptr = s->pb.buf + put_bits_count(&s->pb) / 8;
 437     put_bits(&s->pb, 16, 0xFFFF);               /* vbv_delay */
 438
 439     // RAL: Forward f_code also needed for B-frames
 440     if (s->pict_type == AV_PICTURE_TYPE_P ||
 441         s->pict_type == AV_PICTURE_TYPE_B) {
 442         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 443         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 444             put_bits(&s->pb, 3, s->f_code);     /* forward_f_code */
 445         else
 446             put_bits(&s->pb, 3, 7);             /* forward_f_code */
 447     }
 448
 449     // RAL: Backward f_code necessary for B-frames
 450     if (s->pict_type == AV_PICTURE_TYPE_B) {
 451         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 452         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 453             put_bits(&s->pb, 3, s->b_code);     /* backward_f_code */
 454         else
 455             put_bits(&s->pb, 3, 7);             /* backward_f_code */
 456     }
 457
 458     put_bits(&s->pb, 1, 0);                     /* extra bit picture */
 459
 460     s->frame_pred_frame_dct = 1;
 461     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 462         put_header(s, EXT_START_CODE);
 463         put_bits(&s->pb, 4, 8);                 /* pic ext */
 464         if (s->pict_type == AV_PICTURE_TYPE_P ||
 465             s->pict_type == AV_PICTURE_TYPE_B) {
 466             put_bits(&s->pb, 4, s->f_code);
 467             put_bits(&s->pb, 4, s->f_code);
 468         } else {
 469             put_bits(&s->pb, 8, 255);
 470         }
 471         if (s->pict_type == AV_PICTURE_TYPE_B) {
 472             put_bits(&s->pb, 4, s->b_code);
 473             put_bits(&s->pb, 4, s->b_code);
 474         } else {
 475             put_bits(&s->pb, 8, 255);
 476         }
 477         put_bits(&s->pb, 2, s->intra_dc_precision);
 478
 479         av_assert0(s->picture_structure == PICT_FRAME);
 480         put_bits(&s->pb, 2, s->picture_structure);
 481         if (s->progressive_sequence)
 482             put_bits(&s->pb, 1, 0);             /* no repeat */
 483         else
 484             put_bits(&s->pb, 1, s->current_picture_ptr->f->top_field_first);
 485         /* XXX: optimize the generation of this flag with entropy measures */
 486         s->frame_pred_frame_dct = s->progressive_sequence;
 487
 488         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 489         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 490         put_bits(&s->pb, 1, s->q_scale_type);
 491         put_bits(&s->pb, 1, s->intra_vlc_format);
 492         put_bits(&s->pb, 1, s->alternate_scan);
 493         put_bits(&s->pb, 1, s->repeat_first_field);
 494         s->progressive_frame = s->progressive_sequence;
 495         /* chroma_420_type */
 496         put_bits(&s->pb, 1, s->chroma_format ==
 497                             CHROMA_420 ? s->progressive_frame : 0);
 498         put_bits(&s->pb, 1, s->progressive_frame);
 499         put_bits(&s->pb, 1, 0);                 /* composite_display_flag */
 500     }
 501     if (s->scan_offset) {
 502         int i;
 503
 504         put_header(s, USER_START_CODE);
 505         for (i = 0; i < sizeof(svcd_scan_offset_placeholder); i++)
 506             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 507     }
 508     side_data = av_frame_get_side_data(s->current_picture_ptr->f,
 509                                        AV_FRAME_DATA_STEREO3D);
 510     if (side_data) {
 511         AVStereo3D *stereo = (AVStereo3D *)side_data->data;
 512         uint8_t fpa_type;
 513
 514         switch (stereo->type) {
 515         case AV_STEREO3D_SIDEBYSIDE:
 516             fpa_type = 0x03;
 517             break;
 518         case AV_STEREO3D_TOPBOTTOM:
 519             fpa_type = 0x04;
 520             break;
 521         case AV_STEREO3D_2D:
 522             fpa_type = 0x08;
 523             break;
 524         case AV_STEREO3D_SIDEBYSIDE_QUINCUNX:
 525             fpa_type = 0x23;
 526             break;
 527         default:
 528             fpa_type = 0;
 529             break;
 530         }
 531
 532         if (fpa_type != 0) {
 533             put_header(s, USER_START_CODE);
 534             put_bits(&s->pb, 8, 'J');   // S3D_video_format_signaling_identifier
 535             put_bits(&s->pb, 8, 'P');
 536             put_bits(&s->pb, 8, '3');
 537             put_bits(&s->pb, 8, 'D');
 538             put_bits(&s->pb, 8, 0x03);  // S3D_video_format_length
 539
 540             put_bits(&s->pb, 1, 1);     // reserved_bit
 541             put_bits(&s->pb, 7, fpa_type); // S3D_video_format_type
 542             put_bits(&s->pb, 8, 0x04);  // reserved_data[0]
 543             put_bits(&s->pb, 8, 0xFF);  // reserved_data[1]
 544         }
 545     }
 546
 547     s->mb_y = 0;
 548     ff_mpeg1_encode_slice_header(s);
 549 }
 550
 551 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 552                                 int has_mv, int field_motion)
 553 {
 554     put_bits(&s->pb, n, bits);
 555     if (!s->frame_pred_frame_dct) {
 556         if (has_mv)
 557             /* motion_type: frame/field */
 558             put_bits(&s->pb, 2, 2 - field_motion);
 559         put_bits(&s->pb, 1, s->interlaced_dct);
 560     }
 561 }
 562
 563 // RAL: Parameter added: f_or_b_code
 564 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 565 {
 566     if (val == 0) {
 567         /* zero vector */
 568         put_bits(&s->pb,
 569                  ff_mpeg12_mbMotionVectorTable[0][1],
 570                  ff_mpeg12_mbMotionVectorTable[0][0]);
 571     } else {
 572         int code, sign, bits;
 573         int bit_size = f_or_b_code - 1;
 574         int range    = 1 << bit_size;
 575         /* modulo encoding */
 576         val = sign_extend(val, 5 + bit_size);
 577
 578         if (val >= 0) {
 579             val--;
 580             code = (val >> bit_size) + 1;
 581             bits = val & (range - 1);
 582             sign = 0;
 583         } else {
 584             val = -val;
 585             val--;
 586             code = (val >> bit_size) + 1;
 587             bits = val & (range - 1);
 588             sign = 1;
 589         }
 590
 591         av_assert2(code > 0 && code <= 16);
 592
 593         put_bits(&s->pb,
 594                  ff_mpeg12_mbMotionVectorTable[code][1],
 595                  ff_mpeg12_mbMotionVectorTable[code][0]);
 596
 597         put_bits(&s->pb, 1, sign);
 598         if (bit_size > 0)
 599             put_bits(&s->pb, bit_size, bits);
 600     }
 601 }
 602
 603 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 604 {
 605     unsigned int diff_u = diff + 255;
 606     if (diff_u >= 511) {
 607         int index;
 608
 609         if (diff < 0) {
 610             index = av_log2_16bit(-2 * diff);
 611             diff--;
 612         } else {
 613             index = av_log2_16bit(2 * diff);
 614         }
 615         if (component == 0)
 616             put_bits(&s->pb,
 617                      ff_mpeg12_vlc_dc_lum_bits[index] + index,
 618                      (ff_mpeg12_vlc_dc_lum_code[index] << index) +
 619                      av_mod_uintp2(diff, index));
 620         else
 621             put_bits(&s->pb,
 622                      ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 623                      (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
 624                      av_mod_uintp2(diff, index));
 625     } else {
 626         if (component == 0)
 627             put_bits(&s->pb,
 628                      mpeg1_lum_dc_uni[diff + 255] & 0xFF,
 629                      mpeg1_lum_dc_uni[diff + 255] >> 8);
 630         else
 631             put_bits(&s->pb,
 632                      mpeg1_chr_dc_uni[diff + 255] & 0xFF,
 633                      mpeg1_chr_dc_uni[diff + 255] >> 8);
 634     }
 635 }
 636
 637 static void mpeg1_encode_block(MpegEncContext *s, int16_t *block, int n)
 638 {
 639     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 640     int code, component;
 641     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 642
 643     last_index = s->block_last_index[n];
 644
 645     /* DC coef */
 646     if (s->mb_intra) {
 647         component = (n <= 3 ? 0 : (n & 1) + 1);
 648         dc        = block[0];                   /* overflow is impossible */
 649         diff      = dc - s->last_dc[component];
 650         encode_dc(s, diff, component);
 651         s->last_dc[component] = dc;
 652         i = 1;
 653         if (s->intra_vlc_format)
 654             table_vlc = ff_rl_mpeg2.table_vlc;
 655     } else {
 656         /* encode the first coefficient: needs to be done here because
 657          * it is handled slightly differently */
 658         level = block[0];
 659         if (abs(level) == 1) {
 660             code = ((uint32_t)level >> 31);     /* the sign bit */
 661             put_bits(&s->pb, 2, code | 0x02);
 662             i = 1;
 663         } else {
 664             i             = 0;
 665             last_non_zero = -1;
 666             goto next_coef;
 667         }
 668     }
 669
 670     /* now quantify & encode AC coefs */
 671     last_non_zero = i - 1;
 672
 673     for (; i <= last_index; i++) {
 674         j     = s->intra_scantable.permutated[i];
 675         level = block[j];
 676
 677 next_coef:
 678         /* encode using VLC */
 679         if (level != 0) {
 680             run = i - last_non_zero - 1;
 681
 682             alevel = level;
 683             MASK_ABS(sign, alevel);
 684             sign &= 1;
 685
 686             if (alevel <= mpeg1_max_level[0][run]) {
 687                 code = mpeg1_index_run[0][run] + alevel - 1;
 688                 /* store the VLC & sign at once */
 689                 put_bits(&s->pb, table_vlc[code][1] + 1,
 690                          (table_vlc[code][0] << 1) + sign);
 691             } else {
 692                 /* escape seems to be pretty rare <5% so I do not optimize it */
 693                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 694                 /* escape: only clip in this case */
 695                 put_bits(&s->pb, 6, run);
 696                 if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
 697                     if (alevel < 128) {
 698                         put_sbits(&s->pb, 8, level);
 699                     } else {
 700                         if (level < 0)
 701                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 702                         else
 703                             put_sbits(&s->pb, 16, level);
 704                     }
 705                 } else {
 706                     put_sbits(&s->pb, 12, level);
 707                 }
 708             }
 709             last_non_zero = i;
 710         }
 711     }
 712     /* end of block */
 713     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 714 }
 715
 716 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 717                                                       int16_t block[8][64],
 718                                                       int motion_x, int motion_y,
 719                                                       int mb_block_count)
 720 {
 721     int i, cbp;
 722     const int mb_x     = s->mb_x;
 723     const int mb_y     = s->mb_y;
 724     const int first_mb = mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 725
 726     /* compute cbp */
 727     cbp = 0;
 728     for (i = 0; i < mb_block_count; i++)
 729         if (s->block_last_index[i] >= 0)
 730             cbp |= 1 << (mb_block_count - 1 - i);
 731
 732     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 733         (mb_x != s->mb_width - 1 ||
 734          (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
 735         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 736          (s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir &&
 737           (((s->mv_dir & MV_DIR_FORWARD)
 738             ? ((s->mv[0][0][0] - s->last_mv[0][0][0]) |
 739                (s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
 740            ((s->mv_dir & MV_DIR_BACKWARD)
 741             ? ((s->mv[1][0][0] - s->last_mv[1][0][0]) |
 742                (s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
 743         s->mb_skip_run++;
 744         s->qscale -= s->dquant;
 745         s->skip_count++;
 746         s->misc_bits++;
 747         s->last_bits++;
 748         if (s->pict_type == AV_PICTURE_TYPE_P) {
 749             s->last_mv[0][0][0] =
 750             s->last_mv[0][0][1] =
 751             s->last_mv[0][1][0] =
 752             s->last_mv[0][1][1] = 0;
 753         }
 754     } else {
 755         if (first_mb) {
 756             av_assert0(s->mb_skip_run == 0);
 757             encode_mb_skip_run(s, s->mb_x);
 758         } else {
 759             encode_mb_skip_run(s, s->mb_skip_run);
 760         }
 761
 762         if (s->pict_type == AV_PICTURE_TYPE_I) {
 763             if (s->dquant && cbp) {
 764                 /* macroblock_type: macroblock_quant = 1 */
 765                 put_mb_modes(s, 2, 1, 0, 0);
 766                 put_qscale(s);
 767             } else {
 768                 /* macroblock_type: macroblock_quant = 0 */
 769                 put_mb_modes(s, 1, 1, 0, 0);
 770                 s->qscale -= s->dquant;
 771             }
 772             s->misc_bits += get_bits_diff(s);
 773             s->i_count++;
 774         } else if (s->mb_intra) {
 775             if (s->dquant && cbp) {
 776                 put_mb_modes(s, 6, 0x01, 0, 0);
 777                 put_qscale(s);
 778             } else {
 779                 put_mb_modes(s, 5, 0x03, 0, 0);
 780                 s->qscale -= s->dquant;
 781             }
 782             s->misc_bits += get_bits_diff(s);
 783             s->i_count++;
 784             memset(s->last_mv, 0, sizeof(s->last_mv));
 785         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 786             if (s->mv_type == MV_TYPE_16X16) {
 787                 if (cbp != 0) {
 788                     if ((motion_x | motion_y) == 0) {
 789                         if (s->dquant) {
 790                             /* macroblock_pattern & quant */
 791                             put_mb_modes(s, 5, 1, 0, 0);
 792                             put_qscale(s);
 793                         } else {
 794                             /* macroblock_pattern only */
 795                             put_mb_modes(s, 2, 1, 0, 0);
 796                         }
 797                         s->misc_bits += get_bits_diff(s);
 798                     } else {
 799                         if (s->dquant) {
 800                             put_mb_modes(s, 5, 2, 1, 0);    /* motion + cbp */
 801                             put_qscale(s);
 802                         } else {
 803                             put_mb_modes(s, 1, 1, 1, 0);    /* motion + cbp */
 804                         }
 805                         s->misc_bits += get_bits_diff(s);
 806                         // RAL: f_code parameter added
 807                         mpeg1_encode_motion(s,
 808                                             motion_x - s->last_mv[0][0][0],
 809                                             s->f_code);
 810                         // RAL: f_code parameter added
 811                         mpeg1_encode_motion(s,
 812                                             motion_y - s->last_mv[0][0][1],
 813                                             s->f_code);
 814                         s->mv_bits += get_bits_diff(s);
 815                     }
 816                 } else {
 817                     put_bits(&s->pb, 3, 1);         /* motion only */
 818                     if (!s->frame_pred_frame_dct)
 819                         put_bits(&s->pb, 2, 2);     /* motion_type: frame */
 820                     s->misc_bits += get_bits_diff(s);
 821                     // RAL: f_code parameter added
 822                     mpeg1_encode_motion(s,
 823                                         motion_x - s->last_mv[0][0][0],
 824                                         s->f_code);
 825                     // RAL: f_code parameter added
 826                     mpeg1_encode_motion(s,
 827                                         motion_y - s->last_mv[0][0][1],
 828                                         s->f_code);
 829                     s->qscale  -= s->dquant;
 830                     s->mv_bits += get_bits_diff(s);
 831                 }
 832                 s->last_mv[0][1][0] = s->last_mv[0][0][0] = motion_x;
 833                 s->last_mv[0][1][1] = s->last_mv[0][0][1] = motion_y;
 834             } else {
 835                 av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 836
 837                 if (cbp) {
 838                     if (s->dquant) {
 839                         put_mb_modes(s, 5, 2, 1, 1);    /* motion + cbp */
 840                         put_qscale(s);
 841                     } else {
 842                         put_mb_modes(s, 1, 1, 1, 1);    /* motion + cbp */
 843                     }
 844                 } else {
 845                     put_bits(&s->pb, 3, 1);             /* motion only */
 846                     put_bits(&s->pb, 2, 1);             /* motion_type: field */
 847                     s->qscale -= s->dquant;
 848                 }
 849                 s->misc_bits += get_bits_diff(s);
 850                 for (i = 0; i < 2; i++) {
 851                     put_bits(&s->pb, 1, s->field_select[0][i]);
 852                     mpeg1_encode_motion(s,
 853                                         s->mv[0][i][0] - s->last_mv[0][i][0],
 854                                         s->f_code);
 855                     mpeg1_encode_motion(s,
 856                                         s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 857                                         s->f_code);
 858                     s->last_mv[0][i][0] = s->mv[0][i][0];
 859                     s->last_mv[0][i][1] = 2 * s->mv[0][i][1];
 860                 }
 861                 s->mv_bits += get_bits_diff(s);
 862             }
 863             if (cbp) {
 864                 if (s->chroma_y_shift) {
 865                     put_bits(&s->pb,
 866                              ff_mpeg12_mbPatTable[cbp][1],
 867                              ff_mpeg12_mbPatTable[cbp][0]);
 868                 } else {
 869                     put_bits(&s->pb,
 870                              ff_mpeg12_mbPatTable[cbp >> 2][1],
 871                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
 872                     put_sbits(&s->pb, 2, cbp);
 873                 }
 874             }
 875             s->f_count++;
 876         } else {
 877             if (s->mv_type == MV_TYPE_16X16) {
 878                 if (cbp) {                      // With coded bloc pattern
 879                     if (s->dquant) {
 880                         if (s->mv_dir == MV_DIR_FORWARD)
 881                             put_mb_modes(s, 6, 3, 1, 0);
 882                         else
 883                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 0);
 884                         put_qscale(s);
 885                     } else {
 886                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 0);
 887                     }
 888                 } else {                        // No coded bloc pattern
 889                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 890                     if (!s->frame_pred_frame_dct)
 891                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 892                     s->qscale -= s->dquant;
 893                 }
 894                 s->misc_bits += get_bits_diff(s);
 895                 if (s->mv_dir & MV_DIR_FORWARD) {
 896                     mpeg1_encode_motion(s,
 897                                         s->mv[0][0][0] - s->last_mv[0][0][0],
 898                                         s->f_code);
 899                     mpeg1_encode_motion(s,
 900                                         s->mv[0][0][1] - s->last_mv[0][0][1],
 901                                         s->f_code);
 902                     s->last_mv[0][0][0] =
 903                     s->last_mv[0][1][0] = s->mv[0][0][0];
 904                     s->last_mv[0][0][1] =
 905                     s->last_mv[0][1][1] = s->mv[0][0][1];
 906                     s->f_count++;
 907                 }
 908                 if (s->mv_dir & MV_DIR_BACKWARD) {
 909                     mpeg1_encode_motion(s,
 910                                         s->mv[1][0][0] - s->last_mv[1][0][0],
 911                                         s->b_code);
 912                     mpeg1_encode_motion(s,
 913                                         s->mv[1][0][1] - s->last_mv[1][0][1],
 914                                         s->b_code);
 915                     s->last_mv[1][0][0] =
 916                     s->last_mv[1][1][0] = s->mv[1][0][0];
 917                     s->last_mv[1][0][1] =
 918                     s->last_mv[1][1][1] = s->mv[1][0][1];
 919                     s->b_count++;
 920                 }
 921             } else {
 922                 av_assert2(s->mv_type == MV_TYPE_FIELD);
 923                 av_assert2(!s->frame_pred_frame_dct);
 924                 if (cbp) {                      // With coded bloc pattern
 925                     if (s->dquant) {
 926                         if (s->mv_dir == MV_DIR_FORWARD)
 927                             put_mb_modes(s, 6, 3, 1, 1);
 928                         else
 929                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 1);
 930                         put_qscale(s);
 931                     } else {
 932                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 1);
 933                     }
 934                 } else {                        // No coded bloc pattern
 935                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 936                     put_bits(&s->pb, 2, 1);     /* motion_type: field */
 937                     s->qscale -= s->dquant;
 938                 }
 939                 s->misc_bits += get_bits_diff(s);
 940                 if (s->mv_dir & MV_DIR_FORWARD) {
 941                     for (i = 0; i < 2; i++) {
 942                         put_bits(&s->pb, 1, s->field_select[0][i]);
 943                         mpeg1_encode_motion(s,
 944                                             s->mv[0][i][0] - s->last_mv[0][i][0],
 945                                             s->f_code);
 946                         mpeg1_encode_motion(s,
 947                                             s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 948                                             s->f_code);
 949                         s->last_mv[0][i][0] = s->mv[0][i][0];
 950                         s->last_mv[0][i][1] = s->mv[0][i][1] * 2;
 951                     }
 952                     s->f_count++;
 953                 }
 954                 if (s->mv_dir & MV_DIR_BACKWARD) {
 955                     for (i = 0; i < 2; i++) {
 956                         put_bits(&s->pb, 1, s->field_select[1][i]);
 957                         mpeg1_encode_motion(s,
 958                                             s->mv[1][i][0] - s->last_mv[1][i][0],
 959                                             s->b_code);
 960                         mpeg1_encode_motion(s,
 961                                             s->mv[1][i][1] - (s->last_mv[1][i][1] >> 1),
 962                                             s->b_code);
 963                         s->last_mv[1][i][0] = s->mv[1][i][0];
 964                         s->last_mv[1][i][1] = s->mv[1][i][1] * 2;
 965                     }
 966                     s->b_count++;
 967                 }
 968             }
 969             s->mv_bits += get_bits_diff(s);
 970             if (cbp) {
 971                 if (s->chroma_y_shift) {
 972                     put_bits(&s->pb,
 973                              ff_mpeg12_mbPatTable[cbp][1],
 974                              ff_mpeg12_mbPatTable[cbp][0]);
 975                 } else {
 976                     put_bits(&s->pb,
 977                              ff_mpeg12_mbPatTable[cbp >> 2][1],
 978                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
 979                     put_sbits(&s->pb, 2, cbp);
 980                 }
 981             }
 982         }
 983         for (i = 0; i < mb_block_count; i++)
 984             if (cbp & (1 << (mb_block_count - 1 - i)))
 985                 mpeg1_encode_block(s, block[i], i);
 986         s->mb_skip_run = 0;
 987         if (s->mb_intra)
 988             s->i_tex_bits += get_bits_diff(s);
 989         else
 990             s->p_tex_bits += get_bits_diff(s);
 991     }
 992 }
 993
 994 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
 995                         int motion_x, int motion_y)
 996 {
 997     if (s->chroma_format == CHROMA_420)
 998         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 999     else
1000         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
1001 }
1002
1003 av_cold void ff_mpeg1_encode_init(MpegEncContext *s)
1004 {
1005     static int done = 0;
1006
1007     ff_mpeg12_common_init(s);
1008
1009     if (!done) {
1010         int f_code;
1011         int mv;
1012         int i;
1013
1014         done = 1;
1015         ff_rl_init(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
1016         ff_rl_init(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
1017
1018         for (i = 0; i < 64; i++) {
1019             mpeg1_max_level[0][i] = ff_rl_mpeg1.max_level[0][i];
1020             mpeg1_index_run[0][i] = ff_rl_mpeg1.index_run[0][i];
1021         }
1022
1023         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
1024         if (s->intra_vlc_format)
1025             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
1026
1027         /* build unified dc encoding tables */
1028         for (i = -255; i < 256; i++) {
1029             int adiff, index;
1030             int bits, code;
1031             int diff = i;
1032
1033             adiff = FFABS(diff);
1034             if (diff < 0)
1035                 diff--;
1036             index = av_log2(2 * adiff);
1037
1038             bits = ff_mpeg12_vlc_dc_lum_bits[index] + index;
1039             code = (ff_mpeg12_vlc_dc_lum_code[index] << index) +
1040                     av_mod_uintp2(diff, index);
1041             mpeg1_lum_dc_uni[i + 255] = bits + (code << 8);
1042
1043             bits = ff_mpeg12_vlc_dc_chroma_bits[index] + index;
1044             code = (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
1045                     av_mod_uintp2(diff, index);
1046             mpeg1_chr_dc_uni[i + 255] = bits + (code << 8);
1047         }
1048
1049         for (f_code = 1; f_code <= MAX_FCODE; f_code++)
1050             for (mv = -MAX_DMV; mv <= MAX_DMV; mv++) {
1051                 int len;
1052
1053                 if (mv == 0) {
1054                     len = ff_mpeg12_mbMotionVectorTable[0][1];
1055                 } else {
1056                     int val, bit_size, code;
1057
1058                     bit_size = f_code - 1;
1059
1060                     val = mv;
1061                     if (val < 0)
1062                         val = -val;
1063                     val--;
1064                     code = (val >> bit_size) + 1;
1065                     if (code < 17)
1066                         len = ff_mpeg12_mbMotionVectorTable[code][1] +
1067                               1 + bit_size;
1068                     else
1069                         len = ff_mpeg12_mbMotionVectorTable[16][1] +
1070                               2 + bit_size;
1071                 }
1072
1073                 mv_penalty[f_code][mv + MAX_DMV] = len;
1074             }
1075
1076
1077         for (f_code = MAX_FCODE; f_code > 0; f_code--)
1078             for (mv = -(8 << f_code); mv < (8 << f_code); mv++)
1079                 fcode_tab[mv + MAX_MV] = f_code;
1080     }
1081     s->me.mv_penalty = mv_penalty;
1082     s->fcode_tab     = fcode_tab;
1083     if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1084         s->min_qcoeff = -255;
1085         s->max_qcoeff = 255;
1086     } else {
1087         s->min_qcoeff = -2047;
1088         s->max_qcoeff = 2047;
1089     }
1090     if (s->intra_vlc_format) {
1091         s->intra_ac_vlc_length      =
1092         s->intra_ac_vlc_last_length = uni_mpeg2_ac_vlc_len;
1093     } else {
1094         s->intra_ac_vlc_length      =
1095         s->intra_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1096     }
1097     s->inter_ac_vlc_length      =
1098     s->inter_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1099 }
1100
1101 #define OFFSET(x) offsetof(MpegEncContext, x)
1102 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
1103 #define COMMON_OPTS                                                           \
1104     { "gop_timecode",        "MPEG GOP Timecode in hh:mm:ss[:;.]ff format. Overrides timecode_frame_start.",   \
1105       OFFSET(tc_opt_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, VE },\
1106     { "intra_vlc",           "Use MPEG-2 intra VLC table.",                   \
1107       OFFSET(intra_vlc_format),    AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE }, \
1108     { "drop_frame_timecode", "Timecode is in drop frame format.",             \
1109       OFFSET(drop_frame_timecode), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE }, \
1110     { "scan_offset",         "Reserve space for SVCD scan offset user data.", \
1111       OFFSET(scan_offset),         AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE }, \
1112     { "timecode_frame_start", "GOP timecode frame start number, in non-drop-frame format", \
1113       OFFSET(timecode_frame_start), AV_OPT_TYPE_INT64, {.i64 = -1 }, -1, INT64_MAX, VE}, \
1114
1115 static const AVOption mpeg1_options[] = {
1116     COMMON_OPTS
1117     FF_MPV_COMMON_OPTS
1118     { NULL },
1119 };
1120
1121 static const AVOption mpeg2_options[] = {
1122     COMMON_OPTS
1123     { "non_linear_quant", "Use nonlinear quantizer.",    OFFSET(q_scale_type),   AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
1124     { "alternate_scan",   "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
1125     { "seq_disp_ext",     "Write sequence_display_extension blocks.", OFFSET(seq_disp_ext), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE, "seq_disp_ext" },
1126     {     "auto",   NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = -1},  0, 0, VE, "seq_disp_ext" },
1127     {     "never",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 0 },  0, 0, VE, "seq_disp_ext" },
1128     {     "always", NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 1 },  0, 0, VE, "seq_disp_ext" },
1129     { "video_format",     "Video_format in the sequence_display_extension indicating the source of the video.", OFFSET(video_format), AV_OPT_TYPE_INT, { .i64 = VIDEO_FORMAT_UNSPECIFIED }, 0, 7, VE, "video_format" },
1130     {     "component",    NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_COMPONENT  },  0, 0, VE, "video_format" },
1131     {     "pal",          NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_PAL        },  0, 0, VE, "video_format" },
1132     {     "ntsc",         NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_NTSC       },  0, 0, VE, "video_format" },
1133     {     "secam",        NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_SECAM      },  0, 0, VE, "video_format" },
1134     {     "mac",          NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_MAC        },  0, 0, VE, "video_format" },
1135     {     "unspecified",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_UNSPECIFIED},  0, 0, VE, "video_format" },
1136     FF_MPV_COMMON_OPTS
1137     { NULL },
1138 };
1139
1140 #define mpeg12_class(x)                                 \
1141 static const AVClass mpeg ## x ## _class = {            \
1142     .class_name = "mpeg" # x "video encoder",           \
1143     .item_name  = av_default_item_name,                 \
1144     .option     = mpeg ## x ## _options,                \
1145     .version    = LIBAVUTIL_VERSION_INT,                \
1146 };
1147
1148 mpeg12_class(1)
1149 mpeg12_class(2)
1150
1151 AVCodec ff_mpeg1video_encoder = {
1152     .name                 = "mpeg1video",
1153     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
1154     .type                 = AVMEDIA_TYPE_VIDEO,
1155     .id                   = AV_CODEC_ID_MPEG1VIDEO,
1156     .priv_data_size       = sizeof(MpegEncContext),
1157     .init                 = encode_init,
1158     .encode2              = ff_mpv_encode_picture,
1159     .close                = ff_mpv_encode_end,
1160     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
1161     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1162                                                            AV_PIX_FMT_NONE },
1163     .capabilities         = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
1164     .priv_class           = &mpeg1_class,
1165 };
1166
1167 AVCodec ff_mpeg2video_encoder = {
1168     .name                 = "mpeg2video",
1169     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1170     .type                 = AVMEDIA_TYPE_VIDEO,
1171     .id                   = AV_CODEC_ID_MPEG2VIDEO,
1172     .priv_data_size       = sizeof(MpegEncContext),
1173     .init                 = encode_init,
1174     .encode2              = ff_mpv_encode_picture,
1175     .close                = ff_mpv_encode_end,
1176     .supported_framerates = ff_mpeg2_frame_rate_tab,
1177     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1178                                                            AV_PIX_FMT_YUV422P,
1179                                                            AV_PIX_FMT_NONE },
1180     .capabilities         = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
1181     .priv_class           = &mpeg2_class,
1182 };