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 int8_t inv_non_linear_qscale[] = {
  46     0, 2, 4, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16,
  47    -1,17,-1,18,-1,19, -1, 20, -1, 21, -1, 22, -1,
  48    23,-1,24,-1,-1,-1
  49 };
  50
  51 static const uint8_t svcd_scan_offset_placeholder[] = {
  52     0x10, 0x0E, 0x00, 0x80, 0x81, 0x00, 0x80,
  53     0x81, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  54 };
  55
  56 static uint8_t mv_penalty[MAX_FCODE + 1][MAX_MV * 2 + 1];
  57 static uint8_t fcode_tab[MAX_MV * 2 + 1];
  58
  59 static uint8_t uni_mpeg1_ac_vlc_len[64 * 64 * 2];
  60 static uint8_t uni_mpeg2_ac_vlc_len[64 * 64 * 2];
  61
  62 /* simple include everything table for dc, first byte is bits
  63  * number next 3 are code */
  64 static uint32_t mpeg1_lum_dc_uni[512];
  65 static uint32_t mpeg1_chr_dc_uni[512];
  66
  67 static uint8_t mpeg1_index_run[2][64];
  68 static int8_t  mpeg1_max_level[2][64];
  69
  70 static av_cold void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len)
  71 {
  72     int i;
  73
  74     for (i = 0; i < 128; i++) {
  75         int level = i - 64;
  76         int run;
  77         if (!level)
  78             continue;
  79         for (run = 0; run < 64; run++) {
  80             int len, code;
  81             int alevel = FFABS(level);
  82
  83             if (alevel > rl->max_level[0][run])
  84                 code = 111;                         /* rl->n */
  85             else
  86                 code = rl->index_run[0][run] + alevel - 1;
  87
  88             if (code < 111) {                       /* rl->n */
  89                 /* length of VLC and sign */
  90                 len = rl->table_vlc[code][1] + 1;
  91             } else {
  92                 len = rl->table_vlc[111 /* rl->n */][1] + 6;
  93
  94                 if (alevel < 128)
  95                     len += 8;
  96                 else
  97                     len += 16;
  98             }
  99
 100             uni_ac_vlc_len[UNI_AC_ENC_INDEX(run, i)] = len;
 101         }
 102     }
 103 }
 104
 105 static int find_frame_rate_index(MpegEncContext *s)
 106 {
 107     int i;
 108     AVRational bestq = (AVRational) {0, 0};
 109     AVRational ext;
 110     AVRational target = av_inv_q(s->avctx->time_base);
 111
 112     for (i = 1; i < 14; i++) {
 113         if (s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL &&
 114             i >= 9)
 115             break;
 116
 117         for (ext.num=1; ext.num <= 4; ext.num++) {
 118             for (ext.den=1; ext.den <= 32; ext.den++) {
 119                 AVRational q = av_mul_q(ext, ff_mpeg12_frame_rate_tab[i]);
 120
 121                 if (s->codec_id != AV_CODEC_ID_MPEG2VIDEO && (ext.den!=1 || ext.num!=1))
 122                     continue;
 123                 if (av_gcd(ext.den, ext.num) != 1)
 124                     continue;
 125
 126                 if (    bestq.num==0
 127                     || av_nearer_q(target, bestq, q) < 0
 128                     || ext.num==1 && ext.den==1 && av_nearer_q(target, bestq, q) == 0) {
 129                     bestq               = q;
 130                     s->frame_rate_index = i;
 131                     s->mpeg2_frame_rate_ext.num = ext.num;
 132                     s->mpeg2_frame_rate_ext.den = ext.den;
 133                 }
 134             }
 135         }
 136     }
 137
 138     if (av_cmp_q(target, bestq))
 139         return -1;
 140     else
 141         return 0;
 142 }
 143
 144 static av_cold int encode_init(AVCodecContext *avctx)
 145 {
 146     MpegEncContext *s = avctx->priv_data;
 147
 148     if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && avctx->height > 2800)
 149         avctx->thread_count = 1;
 150
 151     if (ff_mpv_encode_init(avctx) < 0)
 152         return -1;
 153
 154     if (find_frame_rate_index(s) < 0) {
 155         if (s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
 156             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n",
 157                    avctx->time_base.den, avctx->time_base.num);
 158             return -1;
 159         } else {
 160             av_log(avctx, AV_LOG_INFO,
 161                    "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n",
 162                    avctx->time_base.den, avctx->time_base.num);
 163         }
 164     }
 165
 166     if (avctx->profile == FF_PROFILE_UNKNOWN) {
 167         if (avctx->level != FF_LEVEL_UNKNOWN) {
 168             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 169             return -1;
 170         }
 171         /* Main or 4:2:2 */
 172         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0;
 173     }
 174
 175     if (avctx->level == FF_LEVEL_UNKNOWN) {
 176         if (avctx->profile == 0) {                  /* 4:2:2 */
 177             if (avctx->width <= 720 && avctx->height <= 608)
 178                 avctx->level = 5;                   /* Main */
 179             else
 180                 avctx->level = 2;                   /* High */
 181         } else {
 182             if (avctx->profile != 1 && s->chroma_format != CHROMA_420) {
 183                 av_log(avctx, AV_LOG_ERROR,
 184                        "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 185                 return -1;
 186             }
 187             if (avctx->width <= 720 && avctx->height <= 576)
 188                 avctx->level = 8;                   /* Main */
 189             else if (avctx->width <= 1440)
 190                 avctx->level = 6;                   /* High 1440 */
 191             else
 192                 avctx->level = 4;                   /* High */
 193         }
 194     }
 195
 196     if ((avctx->width & 0xFFF) == 0 && (avctx->height & 0xFFF) == 1) {
 197         av_log(avctx, AV_LOG_ERROR, "Width / Height is invalid for MPEG2\n");
 198         return AVERROR(EINVAL);
 199     }
 200
 201     if (s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
 202         if ((avctx->width & 0xFFF) == 0 || (avctx->height & 0xFFF) == 0) {
 203             av_log(avctx, AV_LOG_ERROR, "Width or Height are not allowed to be multiples of 4096\n"
 204                                         "add '-strict %d' if you want to use them anyway.\n", FF_COMPLIANCE_UNOFFICIAL);
 205             return AVERROR(EINVAL);
 206         }
 207     }
 208
 209     s->drop_frame_timecode = s->drop_frame_timecode || !!(avctx->flags2 & AV_CODEC_FLAG2_DROP_FRAME_TIMECODE);
 210     if (s->drop_frame_timecode)
 211         s->tc.flags |= AV_TIMECODE_FLAG_DROPFRAME;
 212     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 213         av_log(avctx, AV_LOG_ERROR,
 214                "Drop frame time code only allowed with 1001/30000 fps\n");
 215         return -1;
 216     }
 217
 218     if (s->tc_opt_str) {
 219         AVRational rate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 220         int ret = av_timecode_init_from_string(&s->tc, rate, s->tc_opt_str, s);
 221         if (ret < 0)
 222             return ret;
 223         s->drop_frame_timecode = !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME);
 224         s->avctx->timecode_frame_start = s->tc.start;
 225     } else {
 226         s->avctx->timecode_frame_start = 0; // default is -1
 227     }
 228     return 0;
 229 }
 230
 231 static void put_header(MpegEncContext *s, int header)
 232 {
 233     avpriv_align_put_bits(&s->pb);
 234     put_bits(&s->pb, 16, header >> 16);
 235     put_sbits(&s->pb, 16, header);
 236 }
 237
 238 /* put sequence header if needed */
 239 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 240 {
 241     unsigned int vbv_buffer_size, fps, v;
 242     int i, constraint_parameter_flag;
 243     uint64_t time_code;
 244     int64_t best_aspect_error = INT64_MAX;
 245     AVRational aspect_ratio = s->avctx->sample_aspect_ratio;
 246
 247     if (aspect_ratio.num == 0 || aspect_ratio.den == 0)
 248         aspect_ratio = (AVRational){1,1};             // pixel aspect 1.1 (VGA)
 249
 250     if (s->current_picture.f->key_frame) {
 251         AVRational framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 252
 253         /* mpeg1 header repeated every gop */
 254         put_header(s, SEQ_START_CODE);
 255
 256         put_sbits(&s->pb, 12, s->width  & 0xFFF);
 257         put_sbits(&s->pb, 12, s->height & 0xFFF);
 258
 259         for (i = 1; i < 15; i++) {
 260             int64_t error = aspect_ratio.num * (1LL<<32) / aspect_ratio.den;
 261             if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <= 1)
 262                 error -= (1LL<<32) / ff_mpeg1_aspect[i];
 263             else
 264                 error -= (1LL<<32)*ff_mpeg2_aspect[i].num * s->height / s->width / ff_mpeg2_aspect[i].den;
 265
 266             error = FFABS(error);
 267
 268             if (error - 2 <= best_aspect_error) {
 269                 best_aspect_error    = error;
 270                 s->aspect_ratio_info = i;
 271             }
 272         }
 273
 274         put_bits(&s->pb, 4, s->aspect_ratio_info);
 275         put_bits(&s->pb, 4, s->frame_rate_index);
 276
 277         if (s->avctx->rc_max_rate) {
 278             v = (s->avctx->rc_max_rate + 399) / 400;
 279             if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 280                 v = 0x3ffff;
 281         } else {
 282             v = 0x3FFFF;
 283         }
 284
 285         if (s->avctx->rc_buffer_size)
 286             vbv_buffer_size = s->avctx->rc_buffer_size;
 287         else
 288             /* VBV calculation: Scaled so that a VCD has the proper
 289              * VBV size of 40 kilobytes */
 290             vbv_buffer_size = ((20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 291         vbv_buffer_size = (vbv_buffer_size + 16383) / 16384;
 292
 293         put_sbits(&s->pb, 18, v);
 294         put_bits(&s->pb, 1, 1);         // marker
 295         put_sbits(&s->pb, 10, vbv_buffer_size);
 296
 297         constraint_parameter_flag =
 298             s->width  <= 768                                    &&
 299             s->height <= 576                                    &&
 300             s->mb_width * s->mb_height                 <= 396   &&
 301             s->mb_width * s->mb_height * framerate.num <= 396 * 25 * framerate.den &&
 302             framerate.num <= framerate.den * 30                 &&
 303             s->avctx->me_range                                  &&
 304             s->avctx->me_range < 128                            &&
 305             vbv_buffer_size <= 20                               &&
 306             v <= 1856000 / 400                                  &&
 307             s->codec_id == AV_CODEC_ID_MPEG1VIDEO;
 308
 309         put_bits(&s->pb, 1, constraint_parameter_flag);
 310
 311         ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 312         ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 313
 314         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 315             AVFrameSideData *side_data;
 316             int width = s->width;
 317             int height = s->height;
 318             int use_seq_disp_ext;
 319
 320             put_header(s, EXT_START_CODE);
 321             put_bits(&s->pb, 4, 1);                 // seq ext
 322
 323             put_bits(&s->pb, 1, s->avctx->profile == 0); // escx 1 for 4:2:2 profile
 324
 325             put_bits(&s->pb, 3, s->avctx->profile); // profile
 326             put_bits(&s->pb, 4, s->avctx->level);   // level
 327
 328             put_bits(&s->pb, 1, s->progressive_sequence);
 329             put_bits(&s->pb, 2, s->chroma_format);
 330             put_bits(&s->pb, 2, s->width  >> 12);
 331             put_bits(&s->pb, 2, s->height >> 12);
 332             put_bits(&s->pb, 12, v >> 18);          // bitrate ext
 333             put_bits(&s->pb, 1, 1);                 // marker
 334             put_bits(&s->pb, 8, vbv_buffer_size >> 10); // vbv buffer ext
 335             put_bits(&s->pb, 1, s->low_delay);
 336             put_bits(&s->pb, 2, s->mpeg2_frame_rate_ext.num-1); // frame_rate_ext_n
 337             put_bits(&s->pb, 5, s->mpeg2_frame_rate_ext.den-1); // frame_rate_ext_d
 338
 339             side_data = av_frame_get_side_data(s->current_picture_ptr->f, AV_FRAME_DATA_PANSCAN);
 340             if (side_data) {
 341                 AVPanScan *pan_scan = (AVPanScan *)side_data->data;
 342                 if (pan_scan->width && pan_scan->height) {
 343                     width = pan_scan->width >> 4;
 344                     height = pan_scan->height >> 4;
 345                 }
 346             }
 347
 348             use_seq_disp_ext = (width != s->width ||
 349                                 height != s->height ||
 350                                 s->avctx->color_primaries != AVCOL_PRI_UNSPECIFIED ||
 351                                 s->avctx->color_trc != AVCOL_TRC_UNSPECIFIED ||
 352                                 s->avctx->colorspace != AVCOL_SPC_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, 0);                         // video_format: 0 is components
 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->avctx->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     if (s->q_scale_type) {
 406         int qp = inv_non_linear_qscale[s->qscale];
 407         av_assert2(s->qscale >= 1 && qp > 0);
 408         put_bits(&s->pb, 5, qp);
 409     } else {
 410         put_bits(&s->pb, 5, s->qscale);
 411     }
 412 }
 413
 414 void ff_mpeg1_encode_slice_header(MpegEncContext *s)
 415 {
 416     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
 417         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 418         /* slice_vertical_position_extension */
 419         put_bits(&s->pb, 3, s->mb_y >> 7);
 420     } else {
 421         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 422     }
 423     put_qscale(s);
 424     /* slice extra information */
 425     put_bits(&s->pb, 1, 0);
 426 }
 427
 428 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 429 {
 430     AVFrameSideData *side_data;
 431     mpeg1_encode_sequence_header(s);
 432
 433     /* mpeg1 picture header */
 434     put_header(s, PICTURE_START_CODE);
 435     /* temporal reference */
 436
 437     // RAL: s->picture_number instead of s->fake_picture_number
 438     put_bits(&s->pb, 10,
 439              (s->picture_number - s->gop_picture_number) & 0x3ff);
 440     put_bits(&s->pb, 3, s->pict_type);
 441
 442     s->vbv_delay_ptr = s->pb.buf + put_bits_count(&s->pb) / 8;
 443     put_bits(&s->pb, 16, 0xFFFF);               /* vbv_delay */
 444
 445     // RAL: Forward f_code also needed for B-frames
 446     if (s->pict_type == AV_PICTURE_TYPE_P ||
 447         s->pict_type == AV_PICTURE_TYPE_B) {
 448         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 449         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 450             put_bits(&s->pb, 3, s->f_code);     /* forward_f_code */
 451         else
 452             put_bits(&s->pb, 3, 7);             /* forward_f_code */
 453     }
 454
 455     // RAL: Backward f_code necessary for B-frames
 456     if (s->pict_type == AV_PICTURE_TYPE_B) {
 457         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 458         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 459             put_bits(&s->pb, 3, s->b_code);     /* backward_f_code */
 460         else
 461             put_bits(&s->pb, 3, 7);             /* backward_f_code */
 462     }
 463
 464     put_bits(&s->pb, 1, 0);                     /* extra bit picture */
 465
 466     s->frame_pred_frame_dct = 1;
 467     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 468         put_header(s, EXT_START_CODE);
 469         put_bits(&s->pb, 4, 8);                 /* pic ext */
 470         if (s->pict_type == AV_PICTURE_TYPE_P ||
 471             s->pict_type == AV_PICTURE_TYPE_B) {
 472             put_bits(&s->pb, 4, s->f_code);
 473             put_bits(&s->pb, 4, s->f_code);
 474         } else {
 475             put_bits(&s->pb, 8, 255);
 476         }
 477         if (s->pict_type == AV_PICTURE_TYPE_B) {
 478             put_bits(&s->pb, 4, s->b_code);
 479             put_bits(&s->pb, 4, s->b_code);
 480         } else {
 481             put_bits(&s->pb, 8, 255);
 482         }
 483         put_bits(&s->pb, 2, s->intra_dc_precision);
 484
 485         av_assert0(s->picture_structure == PICT_FRAME);
 486         put_bits(&s->pb, 2, s->picture_structure);
 487         if (s->progressive_sequence)
 488             put_bits(&s->pb, 1, 0);             /* no repeat */
 489         else
 490             put_bits(&s->pb, 1, s->current_picture_ptr->f->top_field_first);
 491         /* XXX: optimize the generation of this flag with entropy measures */
 492         s->frame_pred_frame_dct = s->progressive_sequence;
 493
 494         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 495         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 496         put_bits(&s->pb, 1, s->q_scale_type);
 497         put_bits(&s->pb, 1, s->intra_vlc_format);
 498         put_bits(&s->pb, 1, s->alternate_scan);
 499         put_bits(&s->pb, 1, s->repeat_first_field);
 500         s->progressive_frame = s->progressive_sequence;
 501         /* chroma_420_type */
 502         put_bits(&s->pb, 1, s->chroma_format ==
 503                             CHROMA_420 ? s->progressive_frame : 0);
 504         put_bits(&s->pb, 1, s->progressive_frame);
 505         put_bits(&s->pb, 1, 0);                 /* composite_display_flag */
 506     }
 507     if (s->scan_offset) {
 508         int i;
 509
 510         put_header(s, USER_START_CODE);
 511         for (i = 0; i < sizeof(svcd_scan_offset_placeholder); i++)
 512             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 513     }
 514     side_data = av_frame_get_side_data(s->current_picture_ptr->f,
 515                                        AV_FRAME_DATA_STEREO3D);
 516     if (side_data) {
 517         AVStereo3D *stereo = (AVStereo3D *)side_data->data;
 518         uint8_t fpa_type;
 519
 520         switch (stereo->type) {
 521         case AV_STEREO3D_SIDEBYSIDE:
 522             fpa_type = 0x03;
 523             break;
 524         case AV_STEREO3D_TOPBOTTOM:
 525             fpa_type = 0x04;
 526             break;
 527         case AV_STEREO3D_2D:
 528             fpa_type = 0x08;
 529             break;
 530         case AV_STEREO3D_SIDEBYSIDE_QUINCUNX:
 531             fpa_type = 0x23;
 532             break;
 533         default:
 534             fpa_type = 0;
 535             break;
 536         }
 537
 538         if (fpa_type != 0) {
 539             put_header(s, USER_START_CODE);
 540             put_bits(&s->pb, 8, 'J');   // S3D_video_format_signaling_identifier
 541             put_bits(&s->pb, 8, 'P');
 542             put_bits(&s->pb, 8, '3');
 543             put_bits(&s->pb, 8, 'D');
 544             put_bits(&s->pb, 8, 0x03);  // S3D_video_format_length
 545
 546             put_bits(&s->pb, 1, 1);     // reserved_bit
 547             put_bits(&s->pb, 7, fpa_type); // S3D_video_format_type
 548             put_bits(&s->pb, 8, 0x04);  // reserved_data[0]
 549             put_bits(&s->pb, 8, 0xFF);  // reserved_data[1]
 550         }
 551     }
 552
 553     s->mb_y = 0;
 554     ff_mpeg1_encode_slice_header(s);
 555 }
 556
 557 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 558                                 int has_mv, int field_motion)
 559 {
 560     put_bits(&s->pb, n, bits);
 561     if (!s->frame_pred_frame_dct) {
 562         if (has_mv)
 563             /* motion_type: frame/field */
 564             put_bits(&s->pb, 2, 2 - field_motion);
 565         put_bits(&s->pb, 1, s->interlaced_dct);
 566     }
 567 }
 568
 569 // RAL: Parameter added: f_or_b_code
 570 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 571 {
 572     if (val == 0) {
 573         /* zero vector */
 574         put_bits(&s->pb,
 575                  ff_mpeg12_mbMotionVectorTable[0][1],
 576                  ff_mpeg12_mbMotionVectorTable[0][0]);
 577     } else {
 578         int code, sign, bits;
 579         int bit_size = f_or_b_code - 1;
 580         int range    = 1 << bit_size;
 581         /* modulo encoding */
 582         val = sign_extend(val, 5 + bit_size);
 583
 584         if (val >= 0) {
 585             val--;
 586             code = (val >> bit_size) + 1;
 587             bits = val & (range - 1);
 588             sign = 0;
 589         } else {
 590             val = -val;
 591             val--;
 592             code = (val >> bit_size) + 1;
 593             bits = val & (range - 1);
 594             sign = 1;
 595         }
 596
 597         av_assert2(code > 0 && code <= 16);
 598
 599         put_bits(&s->pb,
 600                  ff_mpeg12_mbMotionVectorTable[code][1],
 601                  ff_mpeg12_mbMotionVectorTable[code][0]);
 602
 603         put_bits(&s->pb, 1, sign);
 604         if (bit_size > 0)
 605             put_bits(&s->pb, bit_size, bits);
 606     }
 607 }
 608
 609 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 610 {
 611     unsigned int diff_u = diff + 255;
 612     if (diff_u >= 511) {
 613         int index;
 614
 615         if (diff < 0) {
 616             index = av_log2_16bit(-2 * diff);
 617             diff--;
 618         } else {
 619             index = av_log2_16bit(2 * diff);
 620         }
 621         if (component == 0)
 622             put_bits(&s->pb,
 623                      ff_mpeg12_vlc_dc_lum_bits[index] + index,
 624                      (ff_mpeg12_vlc_dc_lum_code[index] << index) +
 625                      av_mod_uintp2(diff, index));
 626         else
 627             put_bits(&s->pb,
 628                      ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 629                      (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
 630                      av_mod_uintp2(diff, index));
 631     } else {
 632         if (component == 0)
 633             put_bits(&s->pb,
 634                      mpeg1_lum_dc_uni[diff + 255] & 0xFF,
 635                      mpeg1_lum_dc_uni[diff + 255] >> 8);
 636         else
 637             put_bits(&s->pb,
 638                      mpeg1_chr_dc_uni[diff + 255] & 0xFF,
 639                      mpeg1_chr_dc_uni[diff + 255] >> 8);
 640     }
 641 }
 642
 643 static void mpeg1_encode_block(MpegEncContext *s, int16_t *block, int n)
 644 {
 645     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 646     int code, component;
 647     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 648
 649     last_index = s->block_last_index[n];
 650
 651     /* DC coef */
 652     if (s->mb_intra) {
 653         component = (n <= 3 ? 0 : (n & 1) + 1);
 654         dc        = block[0];                   /* overflow is impossible */
 655         diff      = dc - s->last_dc[component];
 656         encode_dc(s, diff, component);
 657         s->last_dc[component] = dc;
 658         i = 1;
 659         if (s->intra_vlc_format)
 660             table_vlc = ff_rl_mpeg2.table_vlc;
 661     } else {
 662         /* encode the first coefficient: needs to be done here because
 663          * it is handled slightly differently */
 664         level = block[0];
 665         if (abs(level) == 1) {
 666             code = ((uint32_t)level >> 31);     /* the sign bit */
 667             put_bits(&s->pb, 2, code | 0x02);
 668             i = 1;
 669         } else {
 670             i             = 0;
 671             last_non_zero = -1;
 672             goto next_coef;
 673         }
 674     }
 675
 676     /* now quantify & encode AC coefs */
 677     last_non_zero = i - 1;
 678
 679     for (; i <= last_index; i++) {
 680         j     = s->intra_scantable.permutated[i];
 681         level = block[j];
 682
 683 next_coef:
 684         /* encode using VLC */
 685         if (level != 0) {
 686             run = i - last_non_zero - 1;
 687
 688             alevel = level;
 689             MASK_ABS(sign, alevel);
 690             sign &= 1;
 691
 692             if (alevel <= mpeg1_max_level[0][run]) {
 693                 code = mpeg1_index_run[0][run] + alevel - 1;
 694                 /* store the VLC & sign at once */
 695                 put_bits(&s->pb, table_vlc[code][1] + 1,
 696                          (table_vlc[code][0] << 1) + sign);
 697             } else {
 698                 /* escape seems to be pretty rare <5% so I do not optimize it */
 699                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 700                 /* escape: only clip in this case */
 701                 put_bits(&s->pb, 6, run);
 702                 if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
 703                     if (alevel < 128) {
 704                         put_sbits(&s->pb, 8, level);
 705                     } else {
 706                         if (level < 0)
 707                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 708                         else
 709                             put_sbits(&s->pb, 16, level);
 710                     }
 711                 } else {
 712                     put_sbits(&s->pb, 12, level);
 713                 }
 714             }
 715             last_non_zero = i;
 716         }
 717     }
 718     /* end of block */
 719     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 720 }
 721
 722 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 723                                                       int16_t block[8][64],
 724                                                       int motion_x, int motion_y,
 725                                                       int mb_block_count)
 726 {
 727     int i, cbp;
 728     const int mb_x     = s->mb_x;
 729     const int mb_y     = s->mb_y;
 730     const int first_mb = mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 731
 732     /* compute cbp */
 733     cbp = 0;
 734     for (i = 0; i < mb_block_count; i++)
 735         if (s->block_last_index[i] >= 0)
 736             cbp |= 1 << (mb_block_count - 1 - i);
 737
 738     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 739         (mb_x != s->mb_width - 1 ||
 740          (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
 741         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 742          (s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir &&
 743           (((s->mv_dir & MV_DIR_FORWARD)
 744             ? ((s->mv[0][0][0] - s->last_mv[0][0][0]) |
 745                (s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
 746            ((s->mv_dir & MV_DIR_BACKWARD)
 747             ? ((s->mv[1][0][0] - s->last_mv[1][0][0]) |
 748                (s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
 749         s->mb_skip_run++;
 750         s->qscale -= s->dquant;
 751         s->skip_count++;
 752         s->misc_bits++;
 753         s->last_bits++;
 754         if (s->pict_type == AV_PICTURE_TYPE_P) {
 755             s->last_mv[0][0][0] =
 756             s->last_mv[0][0][1] =
 757             s->last_mv[0][1][0] =
 758             s->last_mv[0][1][1] = 0;
 759         }
 760     } else {
 761         if (first_mb) {
 762             av_assert0(s->mb_skip_run == 0);
 763             encode_mb_skip_run(s, s->mb_x);
 764         } else {
 765             encode_mb_skip_run(s, s->mb_skip_run);
 766         }
 767
 768         if (s->pict_type == AV_PICTURE_TYPE_I) {
 769             if (s->dquant && cbp) {
 770                 /* macroblock_type: macroblock_quant = 1 */
 771                 put_mb_modes(s, 2, 1, 0, 0);
 772                 put_qscale(s);
 773             } else {
 774                 /* macroblock_type: macroblock_quant = 0 */
 775                 put_mb_modes(s, 1, 1, 0, 0);
 776                 s->qscale -= s->dquant;
 777             }
 778             s->misc_bits += get_bits_diff(s);
 779             s->i_count++;
 780         } else if (s->mb_intra) {
 781             if (s->dquant && cbp) {
 782                 put_mb_modes(s, 6, 0x01, 0, 0);
 783                 put_qscale(s);
 784             } else {
 785                 put_mb_modes(s, 5, 0x03, 0, 0);
 786                 s->qscale -= s->dquant;
 787             }
 788             s->misc_bits += get_bits_diff(s);
 789             s->i_count++;
 790             memset(s->last_mv, 0, sizeof(s->last_mv));
 791         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 792             if (s->mv_type == MV_TYPE_16X16) {
 793                 if (cbp != 0) {
 794                     if ((motion_x | motion_y) == 0) {
 795                         if (s->dquant) {
 796                             /* macroblock_pattern & quant */
 797                             put_mb_modes(s, 5, 1, 0, 0);
 798                             put_qscale(s);
 799                         } else {
 800                             /* macroblock_pattern only */
 801                             put_mb_modes(s, 2, 1, 0, 0);
 802                         }
 803                         s->misc_bits += get_bits_diff(s);
 804                     } else {
 805                         if (s->dquant) {
 806                             put_mb_modes(s, 5, 2, 1, 0);    /* motion + cbp */
 807                             put_qscale(s);
 808                         } else {
 809                             put_mb_modes(s, 1, 1, 1, 0);    /* motion + cbp */
 810                         }
 811                         s->misc_bits += get_bits_diff(s);
 812                         // RAL: f_code parameter added
 813                         mpeg1_encode_motion(s,
 814                                             motion_x - s->last_mv[0][0][0],
 815                                             s->f_code);
 816                         // RAL: f_code parameter added
 817                         mpeg1_encode_motion(s,
 818                                             motion_y - s->last_mv[0][0][1],
 819                                             s->f_code);
 820                         s->mv_bits += get_bits_diff(s);
 821                     }
 822                 } else {
 823                     put_bits(&s->pb, 3, 1);         /* motion only */
 824                     if (!s->frame_pred_frame_dct)
 825                         put_bits(&s->pb, 2, 2);     /* motion_type: frame */
 826                     s->misc_bits += get_bits_diff(s);
 827                     // RAL: f_code parameter added
 828                     mpeg1_encode_motion(s,
 829                                         motion_x - s->last_mv[0][0][0],
 830                                         s->f_code);
 831                     // RAL: f_code parameter added
 832                     mpeg1_encode_motion(s,
 833                                         motion_y - s->last_mv[0][0][1],
 834                                         s->f_code);
 835                     s->qscale  -= s->dquant;
 836                     s->mv_bits += get_bits_diff(s);
 837                 }
 838                 s->last_mv[0][1][0] = s->last_mv[0][0][0] = motion_x;
 839                 s->last_mv[0][1][1] = s->last_mv[0][0][1] = motion_y;
 840             } else {
 841                 av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 842
 843                 if (cbp) {
 844                     if (s->dquant) {
 845                         put_mb_modes(s, 5, 2, 1, 1);    /* motion + cbp */
 846                         put_qscale(s);
 847                     } else {
 848                         put_mb_modes(s, 1, 1, 1, 1);    /* motion + cbp */
 849                     }
 850                 } else {
 851                     put_bits(&s->pb, 3, 1);             /* motion only */
 852                     put_bits(&s->pb, 2, 1);             /* motion_type: field */
 853                     s->qscale -= s->dquant;
 854                 }
 855                 s->misc_bits += get_bits_diff(s);
 856                 for (i = 0; i < 2; i++) {
 857                     put_bits(&s->pb, 1, s->field_select[0][i]);
 858                     mpeg1_encode_motion(s,
 859                                         s->mv[0][i][0] - s->last_mv[0][i][0],
 860                                         s->f_code);
 861                     mpeg1_encode_motion(s,
 862                                         s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 863                                         s->f_code);
 864                     s->last_mv[0][i][0] = s->mv[0][i][0];
 865                     s->last_mv[0][i][1] = 2 * s->mv[0][i][1];
 866                 }
 867                 s->mv_bits += get_bits_diff(s);
 868             }
 869             if (cbp) {
 870                 if (s->chroma_y_shift) {
 871                     put_bits(&s->pb,
 872                              ff_mpeg12_mbPatTable[cbp][1],
 873                              ff_mpeg12_mbPatTable[cbp][0]);
 874                 } else {
 875                     put_bits(&s->pb,
 876                              ff_mpeg12_mbPatTable[cbp >> 2][1],
 877                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
 878                     put_sbits(&s->pb, 2, cbp);
 879                 }
 880             }
 881             s->f_count++;
 882         } else {
 883             if (s->mv_type == MV_TYPE_16X16) {
 884                 if (cbp) {                      // With coded bloc pattern
 885                     if (s->dquant) {
 886                         if (s->mv_dir == MV_DIR_FORWARD)
 887                             put_mb_modes(s, 6, 3, 1, 0);
 888                         else
 889                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 0);
 890                         put_qscale(s);
 891                     } else {
 892                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 0);
 893                     }
 894                 } else {                        // No coded bloc pattern
 895                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 896                     if (!s->frame_pred_frame_dct)
 897                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 898                     s->qscale -= s->dquant;
 899                 }
 900                 s->misc_bits += get_bits_diff(s);
 901                 if (s->mv_dir & MV_DIR_FORWARD) {
 902                     mpeg1_encode_motion(s,
 903                                         s->mv[0][0][0] - s->last_mv[0][0][0],
 904                                         s->f_code);
 905                     mpeg1_encode_motion(s,
 906                                         s->mv[0][0][1] - s->last_mv[0][0][1],
 907                                         s->f_code);
 908                     s->last_mv[0][0][0] =
 909                     s->last_mv[0][1][0] = s->mv[0][0][0];
 910                     s->last_mv[0][0][1] =
 911                     s->last_mv[0][1][1] = s->mv[0][0][1];
 912                     s->f_count++;
 913                 }
 914                 if (s->mv_dir & MV_DIR_BACKWARD) {
 915                     mpeg1_encode_motion(s,
 916                                         s->mv[1][0][0] - s->last_mv[1][0][0],
 917                                         s->b_code);
 918                     mpeg1_encode_motion(s,
 919                                         s->mv[1][0][1] - s->last_mv[1][0][1],
 920                                         s->b_code);
 921                     s->last_mv[1][0][0] =
 922                     s->last_mv[1][1][0] = s->mv[1][0][0];
 923                     s->last_mv[1][0][1] =
 924                     s->last_mv[1][1][1] = s->mv[1][0][1];
 925                     s->b_count++;
 926                 }
 927             } else {
 928                 av_assert2(s->mv_type == MV_TYPE_FIELD);
 929                 av_assert2(!s->frame_pred_frame_dct);
 930                 if (cbp) {                      // With coded bloc pattern
 931                     if (s->dquant) {
 932                         if (s->mv_dir == MV_DIR_FORWARD)
 933                             put_mb_modes(s, 6, 3, 1, 1);
 934                         else
 935                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 1);
 936                         put_qscale(s);
 937                     } else {
 938                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 1);
 939                     }
 940                 } else {                        // No coded bloc pattern
 941                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 942                     put_bits(&s->pb, 2, 1);     /* motion_type: field */
 943                     s->qscale -= s->dquant;
 944                 }
 945                 s->misc_bits += get_bits_diff(s);
 946                 if (s->mv_dir & MV_DIR_FORWARD) {
 947                     for (i = 0; i < 2; i++) {
 948                         put_bits(&s->pb, 1, s->field_select[0][i]);
 949                         mpeg1_encode_motion(s,
 950                                             s->mv[0][i][0] - s->last_mv[0][i][0],
 951                                             s->f_code);
 952                         mpeg1_encode_motion(s,
 953                                             s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 954                                             s->f_code);
 955                         s->last_mv[0][i][0] = s->mv[0][i][0];
 956                         s->last_mv[0][i][1] = s->mv[0][i][1] * 2;
 957                     }
 958                     s->f_count++;
 959                 }
 960                 if (s->mv_dir & MV_DIR_BACKWARD) {
 961                     for (i = 0; i < 2; i++) {
 962                         put_bits(&s->pb, 1, s->field_select[1][i]);
 963                         mpeg1_encode_motion(s,
 964                                             s->mv[1][i][0] - s->last_mv[1][i][0],
 965                                             s->b_code);
 966                         mpeg1_encode_motion(s,
 967                                             s->mv[1][i][1] - (s->last_mv[1][i][1] >> 1),
 968                                             s->b_code);
 969                         s->last_mv[1][i][0] = s->mv[1][i][0];
 970                         s->last_mv[1][i][1] = s->mv[1][i][1] * 2;
 971                     }
 972                     s->b_count++;
 973                 }
 974             }
 975             s->mv_bits += get_bits_diff(s);
 976             if (cbp) {
 977                 if (s->chroma_y_shift) {
 978                     put_bits(&s->pb,
 979                              ff_mpeg12_mbPatTable[cbp][1],
 980                              ff_mpeg12_mbPatTable[cbp][0]);
 981                 } else {
 982                     put_bits(&s->pb,
 983                              ff_mpeg12_mbPatTable[cbp >> 2][1],
 984                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
 985                     put_sbits(&s->pb, 2, cbp);
 986                 }
 987             }
 988         }
 989         for (i = 0; i < mb_block_count; i++)
 990             if (cbp & (1 << (mb_block_count - 1 - i)))
 991                 mpeg1_encode_block(s, block[i], i);
 992         s->mb_skip_run = 0;
 993         if (s->mb_intra)
 994             s->i_tex_bits += get_bits_diff(s);
 995         else
 996             s->p_tex_bits += get_bits_diff(s);
 997     }
 998 }
 999
1000 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
1001                         int motion_x, int motion_y)
1002 {
1003     if (s->chroma_format == CHROMA_420)
1004         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
1005     else
1006         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
1007 }
1008
1009 av_cold void ff_mpeg1_encode_init(MpegEncContext *s)
1010 {
1011     static int done = 0;
1012
1013     ff_mpeg12_common_init(s);
1014
1015     if (!done) {
1016         int f_code;
1017         int mv;
1018         int i;
1019
1020         done = 1;
1021         ff_rl_init(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
1022         ff_rl_init(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
1023
1024         for (i = 0; i < 64; i++) {
1025             mpeg1_max_level[0][i] = ff_rl_mpeg1.max_level[0][i];
1026             mpeg1_index_run[0][i] = ff_rl_mpeg1.index_run[0][i];
1027         }
1028
1029         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
1030         if (s->intra_vlc_format)
1031             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
1032
1033         /* build unified dc encoding tables */
1034         for (i = -255; i < 256; i++) {
1035             int adiff, index;
1036             int bits, code;
1037             int diff = i;
1038
1039             adiff = FFABS(diff);
1040             if (diff < 0)
1041                 diff--;
1042             index = av_log2(2 * adiff);
1043
1044             bits = ff_mpeg12_vlc_dc_lum_bits[index] + index;
1045             code = (ff_mpeg12_vlc_dc_lum_code[index] << index) +
1046                     av_mod_uintp2(diff, index);
1047             mpeg1_lum_dc_uni[i + 255] = bits + (code << 8);
1048
1049             bits = ff_mpeg12_vlc_dc_chroma_bits[index] + index;
1050             code = (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
1051                     av_mod_uintp2(diff, index);
1052             mpeg1_chr_dc_uni[i + 255] = bits + (code << 8);
1053         }
1054
1055         for (f_code = 1; f_code <= MAX_FCODE; f_code++)
1056             for (mv = -MAX_MV; mv <= MAX_MV; mv++) {
1057                 int len;
1058
1059                 if (mv == 0) {
1060                     len = ff_mpeg12_mbMotionVectorTable[0][1];
1061                 } else {
1062                     int val, bit_size, code;
1063
1064                     bit_size = f_code - 1;
1065
1066                     val = mv;
1067                     if (val < 0)
1068                         val = -val;
1069                     val--;
1070                     code = (val >> bit_size) + 1;
1071                     if (code < 17)
1072                         len = ff_mpeg12_mbMotionVectorTable[code][1] +
1073                               1 + bit_size;
1074                     else
1075                         len = ff_mpeg12_mbMotionVectorTable[16][1] +
1076                               2 + bit_size;
1077                 }
1078
1079                 mv_penalty[f_code][mv + MAX_MV] = len;
1080             }
1081
1082
1083         for (f_code = MAX_FCODE; f_code > 0; f_code--)
1084             for (mv = -(8 << f_code); mv < (8 << f_code); mv++)
1085                 fcode_tab[mv + MAX_MV] = f_code;
1086     }
1087     s->me.mv_penalty = mv_penalty;
1088     s->fcode_tab     = fcode_tab;
1089     if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1090         s->min_qcoeff = -255;
1091         s->max_qcoeff = 255;
1092     } else {
1093         s->min_qcoeff = -2047;
1094         s->max_qcoeff = 2047;
1095     }
1096     if (s->intra_vlc_format) {
1097         s->intra_ac_vlc_length      =
1098         s->intra_ac_vlc_last_length = uni_mpeg2_ac_vlc_len;
1099     } else {
1100         s->intra_ac_vlc_length      =
1101         s->intra_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1102     }
1103     s->inter_ac_vlc_length      =
1104     s->inter_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1105 }
1106
1107 #define OFFSET(x) offsetof(MpegEncContext, x)
1108 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
1109 #define COMMON_OPTS                                                           \
1110     { "gop_timecode",        "MPEG GOP Timecode in hh:mm:ss[:;.]ff format",   \
1111       OFFSET(tc_opt_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, VE },\
1112     { "intra_vlc",           "Use MPEG-2 intra VLC table.",                   \
1113       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE }, \
1114     { "drop_frame_timecode", "Timecode is in drop frame format.",             \
1115       OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE }, \
1116     { "scan_offset",         "Reserve space for SVCD scan offset user data.", \
1117       OFFSET(scan_offset),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1118
1119 static const AVOption mpeg1_options[] = {
1120     COMMON_OPTS
1121     FF_MPV_COMMON_OPTS
1122     { NULL },
1123 };
1124
1125 static const AVOption mpeg2_options[] = {
1126     COMMON_OPTS
1127     { "non_linear_quant", "Use nonlinear quantizer.",    OFFSET(q_scale_type),   AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1128     { "alternate_scan",   "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1129     { "seq_disp_ext",     "Write sequence_display_extension blocks.", OFFSET(seq_disp_ext), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE, "seq_disp_ext" },
1130     {     "auto",   NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = -1},  0, 0, VE, "seq_disp_ext" },
1131     {     "never",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 0 },  0, 0, VE, "seq_disp_ext" },
1132     {     "always", NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 1 },  0, 0, VE, "seq_disp_ext" },
1133     FF_MPV_COMMON_OPTS
1134     { NULL },
1135 };
1136
1137 #define mpeg12_class(x)                                 \
1138 static const AVClass mpeg ## x ## _class = {            \
1139     .class_name = "mpeg" # x "video encoder",           \
1140     .item_name  = av_default_item_name,                 \
1141     .option     = mpeg ## x ## _options,                \
1142     .version    = LIBAVUTIL_VERSION_INT,                \
1143 };
1144
1145 mpeg12_class(1)
1146 mpeg12_class(2)
1147
1148 AVCodec ff_mpeg1video_encoder = {
1149     .name                 = "mpeg1video",
1150     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
1151     .type                 = AVMEDIA_TYPE_VIDEO,
1152     .id                   = AV_CODEC_ID_MPEG1VIDEO,
1153     .priv_data_size       = sizeof(MpegEncContext),
1154     .init                 = encode_init,
1155     .encode2              = ff_mpv_encode_picture,
1156     .close                = ff_mpv_encode_end,
1157     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
1158     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1159                                                            AV_PIX_FMT_NONE },
1160     .capabilities         = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
1161     .priv_class           = &mpeg1_class,
1162 };
1163
1164 AVCodec ff_mpeg2video_encoder = {
1165     .name                 = "mpeg2video",
1166     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1167     .type                 = AVMEDIA_TYPE_VIDEO,
1168     .id                   = AV_CODEC_ID_MPEG2VIDEO,
1169     .priv_data_size       = sizeof(MpegEncContext),
1170     .init                 = encode_init,
1171     .encode2              = ff_mpv_encode_picture,
1172     .close                = ff_mpv_encode_end,
1173     .supported_framerates = ff_mpeg2_frame_rate_tab,
1174     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1175                                                            AV_PIX_FMT_YUV422P,
1176                                                            AV_PIX_FMT_NONE },
1177     .capabilities         = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
1178     .priv_class           = &mpeg2_class,
1179 };