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   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
 353             if (s->seq_disp_ext == 1 || (s->seq_disp_ext == -1 && use_seq_disp_ext)) {
 354                 put_header(s, EXT_START_CODE);
 355                 put_bits(&s->pb, 4, 2);                         // sequence display extension
 356                 put_bits(&s->pb, 3, 5);                         // video_format: 5 is unspecified
 357                 put_bits(&s->pb, 1, 1);                         // colour_description
 358                 put_bits(&s->pb, 8, s->avctx->color_primaries); // colour_primaries
 359                 put_bits(&s->pb, 8, s->avctx->color_trc);       // transfer_characteristics
 360                 put_bits(&s->pb, 8, s->avctx->colorspace);      // matrix_coefficients
 361                 put_bits(&s->pb, 14, width);                    // display_horizontal_size
 362                 put_bits(&s->pb, 1, 1);                         // marker_bit
 363                 put_bits(&s->pb, 14, height);                   // display_vertical_size
 364                 put_bits(&s->pb, 3, 0);                         // remaining 3 bits are zero padding
 365             }
 366         }
 367
 368         put_header(s, GOP_START_CODE);
 369         put_bits(&s->pb, 1, s->drop_frame_timecode);    // drop frame flag
 370         /* time code: we must convert from the real frame rate to a
 371          * fake MPEG frame rate in case of low frame rate */
 372         fps       = (framerate.num + framerate.den / 2) / framerate.den;
 373         time_code = s->current_picture_ptr->f->coded_picture_number +
 374                     s->timecode_frame_start;
 375
 376         s->gop_picture_number = s->current_picture_ptr->f->coded_picture_number;
 377
 378         av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));
 379         if (s->drop_frame_timecode)
 380             time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);
 381
 382         put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 383         put_bits(&s->pb, 6, (uint32_t)((time_code / (fps *   60)) % 60));
 384         put_bits(&s->pb, 1, 1);
 385         put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 386         put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 387         put_bits(&s->pb, 1, !!(s->avctx->flags & AV_CODEC_FLAG_CLOSED_GOP) || s->intra_only || !s->gop_picture_number);
 388         put_bits(&s->pb, 1, 0);                     // broken link
 389     }
 390 }
 391
 392 static inline void encode_mb_skip_run(MpegEncContext *s, int run)
 393 {
 394     while (run >= 33) {
 395         put_bits(&s->pb, 11, 0x008);
 396         run -= 33;
 397     }
 398     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 399              ff_mpeg12_mbAddrIncrTable[run][0]);
 400 }
 401
 402 static av_always_inline void put_qscale(MpegEncContext *s)
 403 {
 404     put_bits(&s->pb, 5, s->qscale);
 405 }
 406
 407 void ff_mpeg1_encode_slice_header(MpegEncContext *s)
 408 {
 409     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
 410         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 411         /* slice_vertical_position_extension */
 412         put_bits(&s->pb, 3, s->mb_y >> 7);
 413     } else {
 414         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 415     }
 416     put_qscale(s);
 417     /* slice extra information */
 418     put_bits(&s->pb, 1, 0);
 419 }
 420
 421 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 422 {
 423     AVFrameSideData *side_data;
 424     mpeg1_encode_sequence_header(s);
 425
 426     /* MPEG-1 picture header */
 427     put_header(s, PICTURE_START_CODE);
 428     /* temporal reference */
 429
 430     // RAL: s->picture_number instead of s->fake_picture_number
 431     put_bits(&s->pb, 10,
 432              (s->picture_number - s->gop_picture_number) & 0x3ff);
 433     put_bits(&s->pb, 3, s->pict_type);
 434
 435     s->vbv_delay_ptr = s->pb.buf + put_bits_count(&s->pb) / 8;
 436     put_bits(&s->pb, 16, 0xFFFF);               /* vbv_delay */
 437
 438     // RAL: Forward f_code also needed for B-frames
 439     if (s->pict_type == AV_PICTURE_TYPE_P ||
 440         s->pict_type == AV_PICTURE_TYPE_B) {
 441         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 442         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 443             put_bits(&s->pb, 3, s->f_code);     /* forward_f_code */
 444         else
 445             put_bits(&s->pb, 3, 7);             /* forward_f_code */
 446     }
 447
 448     // RAL: Backward f_code necessary for B-frames
 449     if (s->pict_type == AV_PICTURE_TYPE_B) {
 450         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 451         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 452             put_bits(&s->pb, 3, s->b_code);     /* backward_f_code */
 453         else
 454             put_bits(&s->pb, 3, 7);             /* backward_f_code */
 455     }
 456
 457     put_bits(&s->pb, 1, 0);                     /* extra bit picture */
 458
 459     s->frame_pred_frame_dct = 1;
 460     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 461         put_header(s, EXT_START_CODE);
 462         put_bits(&s->pb, 4, 8);                 /* pic ext */
 463         if (s->pict_type == AV_PICTURE_TYPE_P ||
 464             s->pict_type == AV_PICTURE_TYPE_B) {
 465             put_bits(&s->pb, 4, s->f_code);
 466             put_bits(&s->pb, 4, s->f_code);
 467         } else {
 468             put_bits(&s->pb, 8, 255);
 469         }
 470         if (s->pict_type == AV_PICTURE_TYPE_B) {
 471             put_bits(&s->pb, 4, s->b_code);
 472             put_bits(&s->pb, 4, s->b_code);
 473         } else {
 474             put_bits(&s->pb, 8, 255);
 475         }
 476         put_bits(&s->pb, 2, s->intra_dc_precision);
 477
 478         av_assert0(s->picture_structure == PICT_FRAME);
 479         put_bits(&s->pb, 2, s->picture_structure);
 480         if (s->progressive_sequence)
 481             put_bits(&s->pb, 1, 0);             /* no repeat */
 482         else
 483             put_bits(&s->pb, 1, s->current_picture_ptr->f->top_field_first);
 484         /* XXX: optimize the generation of this flag with entropy measures */
 485         s->frame_pred_frame_dct = s->progressive_sequence;
 486
 487         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 488         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 489         put_bits(&s->pb, 1, s->q_scale_type);
 490         put_bits(&s->pb, 1, s->intra_vlc_format);
 491         put_bits(&s->pb, 1, s->alternate_scan);
 492         put_bits(&s->pb, 1, s->repeat_first_field);
 493         s->progressive_frame = s->progressive_sequence;
 494         /* chroma_420_type */
 495         put_bits(&s->pb, 1, s->chroma_format ==
 496                             CHROMA_420 ? s->progressive_frame : 0);
 497         put_bits(&s->pb, 1, s->progressive_frame);
 498         put_bits(&s->pb, 1, 0);                 /* composite_display_flag */
 499     }
 500     if (s->scan_offset) {
 501         int i;
 502
 503         put_header(s, USER_START_CODE);
 504         for (i = 0; i < sizeof(svcd_scan_offset_placeholder); i++)
 505             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 506     }
 507     side_data = av_frame_get_side_data(s->current_picture_ptr->f,
 508                                        AV_FRAME_DATA_STEREO3D);
 509     if (side_data) {
 510         AVStereo3D *stereo = (AVStereo3D *)side_data->data;
 511         uint8_t fpa_type;
 512
 513         switch (stereo->type) {
 514         case AV_STEREO3D_SIDEBYSIDE:
 515             fpa_type = 0x03;
 516             break;
 517         case AV_STEREO3D_TOPBOTTOM:
 518             fpa_type = 0x04;
 519             break;
 520         case AV_STEREO3D_2D:
 521             fpa_type = 0x08;
 522             break;
 523         case AV_STEREO3D_SIDEBYSIDE_QUINCUNX:
 524             fpa_type = 0x23;
 525             break;
 526         default:
 527             fpa_type = 0;
 528             break;
 529         }
 530
 531         if (fpa_type != 0) {
 532             put_header(s, USER_START_CODE);
 533             put_bits(&s->pb, 8, 'J');   // S3D_video_format_signaling_identifier
 534             put_bits(&s->pb, 8, 'P');
 535             put_bits(&s->pb, 8, '3');
 536             put_bits(&s->pb, 8, 'D');
 537             put_bits(&s->pb, 8, 0x03);  // S3D_video_format_length
 538
 539             put_bits(&s->pb, 1, 1);     // reserved_bit
 540             put_bits(&s->pb, 7, fpa_type); // S3D_video_format_type
 541             put_bits(&s->pb, 8, 0x04);  // reserved_data[0]
 542             put_bits(&s->pb, 8, 0xFF);  // reserved_data[1]
 543         }
 544     }
 545
 546     s->mb_y = 0;
 547     ff_mpeg1_encode_slice_header(s);
 548 }
 549
 550 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 551                                 int has_mv, int field_motion)
 552 {
 553     put_bits(&s->pb, n, bits);
 554     if (!s->frame_pred_frame_dct) {
 555         if (has_mv)
 556             /* motion_type: frame/field */
 557             put_bits(&s->pb, 2, 2 - field_motion);
 558         put_bits(&s->pb, 1, s->interlaced_dct);
 559     }
 560 }
 561
 562 // RAL: Parameter added: f_or_b_code
 563 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 564 {
 565     if (val == 0) {
 566         /* zero vector */
 567         put_bits(&s->pb,
 568                  ff_mpeg12_mbMotionVectorTable[0][1],
 569                  ff_mpeg12_mbMotionVectorTable[0][0]);
 570     } else {
 571         int code, sign, bits;
 572         int bit_size = f_or_b_code - 1;
 573         int range    = 1 << bit_size;
 574         /* modulo encoding */
 575         val = sign_extend(val, 5 + bit_size);
 576
 577         if (val >= 0) {
 578             val--;
 579             code = (val >> bit_size) + 1;
 580             bits = val & (range - 1);
 581             sign = 0;
 582         } else {
 583             val = -val;
 584             val--;
 585             code = (val >> bit_size) + 1;
 586             bits = val & (range - 1);
 587             sign = 1;
 588         }
 589
 590         av_assert2(code > 0 && code <= 16);
 591
 592         put_bits(&s->pb,
 593                  ff_mpeg12_mbMotionVectorTable[code][1],
 594                  ff_mpeg12_mbMotionVectorTable[code][0]);
 595
 596         put_bits(&s->pb, 1, sign);
 597         if (bit_size > 0)
 598             put_bits(&s->pb, bit_size, bits);
 599     }
 600 }
 601
 602 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 603 {
 604     unsigned int diff_u = diff + 255;
 605     if (diff_u >= 511) {
 606         int index;
 607
 608         if (diff < 0) {
 609             index = av_log2_16bit(-2 * diff);
 610             diff--;
 611         } else {
 612             index = av_log2_16bit(2 * diff);
 613         }
 614         if (component == 0)
 615             put_bits(&s->pb,
 616                      ff_mpeg12_vlc_dc_lum_bits[index] + index,
 617                      (ff_mpeg12_vlc_dc_lum_code[index] << index) +
 618                      av_mod_uintp2(diff, index));
 619         else
 620             put_bits(&s->pb,
 621                      ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 622                      (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
 623                      av_mod_uintp2(diff, index));
 624     } else {
 625         if (component == 0)
 626             put_bits(&s->pb,
 627                      mpeg1_lum_dc_uni[diff + 255] & 0xFF,
 628                      mpeg1_lum_dc_uni[diff + 255] >> 8);
 629         else
 630             put_bits(&s->pb,
 631                      mpeg1_chr_dc_uni[diff + 255] & 0xFF,
 632                      mpeg1_chr_dc_uni[diff + 255] >> 8);
 633     }
 634 }
 635
 636 static void mpeg1_encode_block(MpegEncContext *s, int16_t *block, int n)
 637 {
 638     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 639     int code, component;
 640     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 641
 642     last_index = s->block_last_index[n];
 643
 644     /* DC coef */
 645     if (s->mb_intra) {
 646         component = (n <= 3 ? 0 : (n & 1) + 1);
 647         dc        = block[0];                   /* overflow is impossible */
 648         diff      = dc - s->last_dc[component];
 649         encode_dc(s, diff, component);
 650         s->last_dc[component] = dc;
 651         i = 1;
 652         if (s->intra_vlc_format)
 653             table_vlc = ff_rl_mpeg2.table_vlc;
 654     } else {
 655         /* encode the first coefficient: needs to be done here because
 656          * it is handled slightly differently */
 657         level = block[0];
 658         if (abs(level) == 1) {
 659             code = ((uint32_t)level >> 31);     /* the sign bit */
 660             put_bits(&s->pb, 2, code | 0x02);
 661             i = 1;
 662         } else {
 663             i             = 0;
 664             last_non_zero = -1;
 665             goto next_coef;
 666         }
 667     }
 668
 669     /* now quantify & encode AC coefs */
 670     last_non_zero = i - 1;
 671
 672     for (; i <= last_index; i++) {
 673         j     = s->intra_scantable.permutated[i];
 674         level = block[j];
 675
 676 next_coef:
 677         /* encode using VLC */
 678         if (level != 0) {
 679             run = i - last_non_zero - 1;
 680
 681             alevel = level;
 682             MASK_ABS(sign, alevel);
 683             sign &= 1;
 684
 685             if (alevel <= mpeg1_max_level[0][run]) {
 686                 code = mpeg1_index_run[0][run] + alevel - 1;
 687                 /* store the VLC & sign at once */
 688                 put_bits(&s->pb, table_vlc[code][1] + 1,
 689                          (table_vlc[code][0] << 1) + sign);
 690             } else {
 691                 /* escape seems to be pretty rare <5% so I do not optimize it */
 692                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 693                 /* escape: only clip in this case */
 694                 put_bits(&s->pb, 6, run);
 695                 if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
 696                     if (alevel < 128) {
 697                         put_sbits(&s->pb, 8, level);
 698                     } else {
 699                         if (level < 0)
 700                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 701                         else
 702                             put_sbits(&s->pb, 16, level);
 703                     }
 704                 } else {
 705                     put_sbits(&s->pb, 12, level);
 706                 }
 707             }
 708             last_non_zero = i;
 709         }
 710     }
 711     /* end of block */
 712     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 713 }
 714
 715 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 716                                                       int16_t block[8][64],
 717                                                       int motion_x, int motion_y,
 718                                                       int mb_block_count)
 719 {
 720     int i, cbp;
 721     const int mb_x     = s->mb_x;
 722     const int mb_y     = s->mb_y;
 723     const int first_mb = mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 724
 725     /* compute cbp */
 726     cbp = 0;
 727     for (i = 0; i < mb_block_count; i++)
 728         if (s->block_last_index[i] >= 0)
 729             cbp |= 1 << (mb_block_count - 1 - i);
 730
 731     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 732         (mb_x != s->mb_width - 1 ||
 733          (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
 734         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 735          (s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir &&
 736           (((s->mv_dir & MV_DIR_FORWARD)
 737             ? ((s->mv[0][0][0] - s->last_mv[0][0][0]) |
 738                (s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
 739            ((s->mv_dir & MV_DIR_BACKWARD)
 740             ? ((s->mv[1][0][0] - s->last_mv[1][0][0]) |
 741                (s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
 742         s->mb_skip_run++;
 743         s->qscale -= s->dquant;
 744         s->skip_count++;
 745         s->misc_bits++;
 746         s->last_bits++;
 747         if (s->pict_type == AV_PICTURE_TYPE_P) {
 748             s->last_mv[0][0][0] =
 749             s->last_mv[0][0][1] =
 750             s->last_mv[0][1][0] =
 751             s->last_mv[0][1][1] = 0;
 752         }
 753     } else {
 754         if (first_mb) {
 755             av_assert0(s->mb_skip_run == 0);
 756             encode_mb_skip_run(s, s->mb_x);
 757         } else {
 758             encode_mb_skip_run(s, s->mb_skip_run);
 759         }
 760
 761         if (s->pict_type == AV_PICTURE_TYPE_I) {
 762             if (s->dquant && cbp) {
 763                 /* macroblock_type: macroblock_quant = 1 */
 764                 put_mb_modes(s, 2, 1, 0, 0);
 765                 put_qscale(s);
 766             } else {
 767                 /* macroblock_type: macroblock_quant = 0 */
 768                 put_mb_modes(s, 1, 1, 0, 0);
 769                 s->qscale -= s->dquant;
 770             }
 771             s->misc_bits += get_bits_diff(s);
 772             s->i_count++;
 773         } else if (s->mb_intra) {
 774             if (s->dquant && cbp) {
 775                 put_mb_modes(s, 6, 0x01, 0, 0);
 776                 put_qscale(s);
 777             } else {
 778                 put_mb_modes(s, 5, 0x03, 0, 0);
 779                 s->qscale -= s->dquant;
 780             }
 781             s->misc_bits += get_bits_diff(s);
 782             s->i_count++;
 783             memset(s->last_mv, 0, sizeof(s->last_mv));
 784         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 785             if (s->mv_type == MV_TYPE_16X16) {
 786                 if (cbp != 0) {
 787                     if ((motion_x | motion_y) == 0) {
 788                         if (s->dquant) {
 789                             /* macroblock_pattern & quant */
 790                             put_mb_modes(s, 5, 1, 0, 0);
 791                             put_qscale(s);
 792                         } else {
 793                             /* macroblock_pattern only */
 794                             put_mb_modes(s, 2, 1, 0, 0);
 795                         }
 796                         s->misc_bits += get_bits_diff(s);
 797                     } else {
 798                         if (s->dquant) {
 799                             put_mb_modes(s, 5, 2, 1, 0);    /* motion + cbp */
 800                             put_qscale(s);
 801                         } else {
 802                             put_mb_modes(s, 1, 1, 1, 0);    /* motion + cbp */
 803                         }
 804                         s->misc_bits += get_bits_diff(s);
 805                         // RAL: f_code parameter added
 806                         mpeg1_encode_motion(s,
 807                                             motion_x - s->last_mv[0][0][0],
 808                                             s->f_code);
 809                         // RAL: f_code parameter added
 810                         mpeg1_encode_motion(s,
 811                                             motion_y - s->last_mv[0][0][1],
 812                                             s->f_code);
 813                         s->mv_bits += get_bits_diff(s);
 814                     }
 815                 } else {
 816                     put_bits(&s->pb, 3, 1);         /* motion only */
 817                     if (!s->frame_pred_frame_dct)
 818                         put_bits(&s->pb, 2, 2);     /* motion_type: frame */
 819                     s->misc_bits += get_bits_diff(s);
 820                     // RAL: f_code parameter added
 821                     mpeg1_encode_motion(s,
 822                                         motion_x - s->last_mv[0][0][0],
 823                                         s->f_code);
 824                     // RAL: f_code parameter added
 825                     mpeg1_encode_motion(s,
 826                                         motion_y - s->last_mv[0][0][1],
 827                                         s->f_code);
 828                     s->qscale  -= s->dquant;
 829                     s->mv_bits += get_bits_diff(s);
 830                 }
 831                 s->last_mv[0][1][0] = s->last_mv[0][0][0] = motion_x;
 832                 s->last_mv[0][1][1] = s->last_mv[0][0][1] = motion_y;
 833             } else {
 834                 av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 835
 836                 if (cbp) {
 837                     if (s->dquant) {
 838                         put_mb_modes(s, 5, 2, 1, 1);    /* motion + cbp */
 839                         put_qscale(s);
 840                     } else {
 841                         put_mb_modes(s, 1, 1, 1, 1);    /* motion + cbp */
 842                     }
 843                 } else {
 844                     put_bits(&s->pb, 3, 1);             /* motion only */
 845                     put_bits(&s->pb, 2, 1);             /* motion_type: field */
 846                     s->qscale -= s->dquant;
 847                 }
 848                 s->misc_bits += get_bits_diff(s);
 849                 for (i = 0; i < 2; i++) {
 850                     put_bits(&s->pb, 1, s->field_select[0][i]);
 851                     mpeg1_encode_motion(s,
 852                                         s->mv[0][i][0] - s->last_mv[0][i][0],
 853                                         s->f_code);
 854                     mpeg1_encode_motion(s,
 855                                         s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 856                                         s->f_code);
 857                     s->last_mv[0][i][0] = s->mv[0][i][0];
 858                     s->last_mv[0][i][1] = 2 * s->mv[0][i][1];
 859                 }
 860                 s->mv_bits += get_bits_diff(s);
 861             }
 862             if (cbp) {
 863                 if (s->chroma_y_shift) {
 864                     put_bits(&s->pb,
 865                              ff_mpeg12_mbPatTable[cbp][1],
 866                              ff_mpeg12_mbPatTable[cbp][0]);
 867                 } else {
 868                     put_bits(&s->pb,
 869                              ff_mpeg12_mbPatTable[cbp >> 2][1],
 870                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
 871                     put_sbits(&s->pb, 2, cbp);
 872                 }
 873             }
 874             s->f_count++;
 875         } else {
 876             if (s->mv_type == MV_TYPE_16X16) {
 877                 if (cbp) {                      // With coded bloc pattern
 878                     if (s->dquant) {
 879                         if (s->mv_dir == MV_DIR_FORWARD)
 880                             put_mb_modes(s, 6, 3, 1, 0);
 881                         else
 882                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 0);
 883                         put_qscale(s);
 884                     } else {
 885                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 0);
 886                     }
 887                 } else {                        // No coded bloc pattern
 888                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 889                     if (!s->frame_pred_frame_dct)
 890                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 891                     s->qscale -= s->dquant;
 892                 }
 893                 s->misc_bits += get_bits_diff(s);
 894                 if (s->mv_dir & MV_DIR_FORWARD) {
 895                     mpeg1_encode_motion(s,
 896                                         s->mv[0][0][0] - s->last_mv[0][0][0],
 897                                         s->f_code);
 898                     mpeg1_encode_motion(s,
 899                                         s->mv[0][0][1] - s->last_mv[0][0][1],
 900                                         s->f_code);
 901                     s->last_mv[0][0][0] =
 902                     s->last_mv[0][1][0] = s->mv[0][0][0];
 903                     s->last_mv[0][0][1] =
 904                     s->last_mv[0][1][1] = s->mv[0][0][1];
 905                     s->f_count++;
 906                 }
 907                 if (s->mv_dir & MV_DIR_BACKWARD) {
 908                     mpeg1_encode_motion(s,
 909                                         s->mv[1][0][0] - s->last_mv[1][0][0],
 910                                         s->b_code);
 911                     mpeg1_encode_motion(s,
 912                                         s->mv[1][0][1] - s->last_mv[1][0][1],
 913                                         s->b_code);
 914                     s->last_mv[1][0][0] =
 915                     s->last_mv[1][1][0] = s->mv[1][0][0];
 916                     s->last_mv[1][0][1] =
 917                     s->last_mv[1][1][1] = s->mv[1][0][1];
 918                     s->b_count++;
 919                 }
 920             } else {
 921                 av_assert2(s->mv_type == MV_TYPE_FIELD);
 922                 av_assert2(!s->frame_pred_frame_dct);
 923                 if (cbp) {                      // With coded bloc pattern
 924                     if (s->dquant) {
 925                         if (s->mv_dir == MV_DIR_FORWARD)
 926                             put_mb_modes(s, 6, 3, 1, 1);
 927                         else
 928                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 1);
 929                         put_qscale(s);
 930                     } else {
 931                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 1);
 932                     }
 933                 } else {                        // No coded bloc pattern
 934                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 935                     put_bits(&s->pb, 2, 1);     /* motion_type: field */
 936                     s->qscale -= s->dquant;
 937                 }
 938                 s->misc_bits += get_bits_diff(s);
 939                 if (s->mv_dir & MV_DIR_FORWARD) {
 940                     for (i = 0; i < 2; i++) {
 941                         put_bits(&s->pb, 1, s->field_select[0][i]);
 942                         mpeg1_encode_motion(s,
 943                                             s->mv[0][i][0] - s->last_mv[0][i][0],
 944                                             s->f_code);
 945                         mpeg1_encode_motion(s,
 946                                             s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 947                                             s->f_code);
 948                         s->last_mv[0][i][0] = s->mv[0][i][0];
 949                         s->last_mv[0][i][1] = s->mv[0][i][1] * 2;
 950                     }
 951                     s->f_count++;
 952                 }
 953                 if (s->mv_dir & MV_DIR_BACKWARD) {
 954                     for (i = 0; i < 2; i++) {
 955                         put_bits(&s->pb, 1, s->field_select[1][i]);
 956                         mpeg1_encode_motion(s,
 957                                             s->mv[1][i][0] - s->last_mv[1][i][0],
 958                                             s->b_code);
 959                         mpeg1_encode_motion(s,
 960                                             s->mv[1][i][1] - (s->last_mv[1][i][1] >> 1),
 961                                             s->b_code);
 962                         s->last_mv[1][i][0] = s->mv[1][i][0];
 963                         s->last_mv[1][i][1] = s->mv[1][i][1] * 2;
 964                     }
 965                     s->b_count++;
 966                 }
 967             }
 968             s->mv_bits += get_bits_diff(s);
 969             if (cbp) {
 970                 if (s->chroma_y_shift) {
 971                     put_bits(&s->pb,
 972                              ff_mpeg12_mbPatTable[cbp][1],
 973                              ff_mpeg12_mbPatTable[cbp][0]);
 974                 } else {
 975                     put_bits(&s->pb,
 976                              ff_mpeg12_mbPatTable[cbp >> 2][1],
 977                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
 978                     put_sbits(&s->pb, 2, cbp);
 979                 }
 980             }
 981         }
 982         for (i = 0; i < mb_block_count; i++)
 983             if (cbp & (1 << (mb_block_count - 1 - i)))
 984                 mpeg1_encode_block(s, block[i], i);
 985         s->mb_skip_run = 0;
 986         if (s->mb_intra)
 987             s->i_tex_bits += get_bits_diff(s);
 988         else
 989             s->p_tex_bits += get_bits_diff(s);
 990     }
 991 }
 992
 993 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
 994                         int motion_x, int motion_y)
 995 {
 996     if (s->chroma_format == CHROMA_420)
 997         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 998     else
 999         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
1000 }
1001
1002 av_cold void ff_mpeg1_encode_init(MpegEncContext *s)
1003 {
1004     static int done = 0;
1005
1006     ff_mpeg12_common_init(s);
1007
1008     if (!done) {
1009         int f_code;
1010         int mv;
1011         int i;
1012
1013         done = 1;
1014         ff_rl_init(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
1015         ff_rl_init(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
1016
1017         for (i = 0; i < 64; i++) {
1018             mpeg1_max_level[0][i] = ff_rl_mpeg1.max_level[0][i];
1019             mpeg1_index_run[0][i] = ff_rl_mpeg1.index_run[0][i];
1020         }
1021
1022         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
1023         if (s->intra_vlc_format)
1024             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
1025
1026         /* build unified dc encoding tables */
1027         for (i = -255; i < 256; i++) {
1028             int adiff, index;
1029             int bits, code;
1030             int diff = i;
1031
1032             adiff = FFABS(diff);
1033             if (diff < 0)
1034                 diff--;
1035             index = av_log2(2 * adiff);
1036
1037             bits = ff_mpeg12_vlc_dc_lum_bits[index] + index;
1038             code = (ff_mpeg12_vlc_dc_lum_code[index] << index) +
1039                     av_mod_uintp2(diff, index);
1040             mpeg1_lum_dc_uni[i + 255] = bits + (code << 8);
1041
1042             bits = ff_mpeg12_vlc_dc_chroma_bits[index] + index;
1043             code = (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
1044                     av_mod_uintp2(diff, index);
1045             mpeg1_chr_dc_uni[i + 255] = bits + (code << 8);
1046         }
1047
1048         for (f_code = 1; f_code <= MAX_FCODE; f_code++)
1049             for (mv = -MAX_DMV; mv <= MAX_DMV; mv++) {
1050                 int len;
1051
1052                 if (mv == 0) {
1053                     len = ff_mpeg12_mbMotionVectorTable[0][1];
1054                 } else {
1055                     int val, bit_size, code;
1056
1057                     bit_size = f_code - 1;
1058
1059                     val = mv;
1060                     if (val < 0)
1061                         val = -val;
1062                     val--;
1063                     code = (val >> bit_size) + 1;
1064                     if (code < 17)
1065                         len = ff_mpeg12_mbMotionVectorTable[code][1] +
1066                               1 + bit_size;
1067                     else
1068                         len = ff_mpeg12_mbMotionVectorTable[16][1] +
1069                               2 + bit_size;
1070                 }
1071
1072                 mv_penalty[f_code][mv + MAX_DMV] = len;
1073             }
1074
1075
1076         for (f_code = MAX_FCODE; f_code > 0; f_code--)
1077             for (mv = -(8 << f_code); mv < (8 << f_code); mv++)
1078                 fcode_tab[mv + MAX_MV] = f_code;
1079     }
1080     s->me.mv_penalty = mv_penalty;
1081     s->fcode_tab     = fcode_tab;
1082     if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1083         s->min_qcoeff = -255;
1084         s->max_qcoeff = 255;
1085     } else {
1086         s->min_qcoeff = -2047;
1087         s->max_qcoeff = 2047;
1088     }
1089     if (s->intra_vlc_format) {
1090         s->intra_ac_vlc_length      =
1091         s->intra_ac_vlc_last_length = uni_mpeg2_ac_vlc_len;
1092     } else {
1093         s->intra_ac_vlc_length      =
1094         s->intra_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1095     }
1096     s->inter_ac_vlc_length      =
1097     s->inter_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1098 }
1099
1100 #define OFFSET(x) offsetof(MpegEncContext, x)
1101 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
1102 #define COMMON_OPTS                                                           \
1103     { "gop_timecode",        "MPEG GOP Timecode in hh:mm:ss[:;.]ff format. Overrides timecode_frame_start.",   \
1104       OFFSET(tc_opt_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, VE },\
1105     { "intra_vlc",           "Use MPEG-2 intra VLC table.",                   \
1106       OFFSET(intra_vlc_format),    AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE }, \
1107     { "drop_frame_timecode", "Timecode is in drop frame format.",             \
1108       OFFSET(drop_frame_timecode), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE }, \
1109     { "scan_offset",         "Reserve space for SVCD scan offset user data.", \
1110       OFFSET(scan_offset),         AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE }, \
1111     { "timecode_frame_start", "GOP timecode frame start number, in non-drop-frame format", \
1112       OFFSET(timecode_frame_start), AV_OPT_TYPE_INT64, {.i64 = -1 }, -1, INT64_MAX, VE}, \
1113
1114 static const AVOption mpeg1_options[] = {
1115     COMMON_OPTS
1116     FF_MPV_COMMON_OPTS
1117     { NULL },
1118 };
1119
1120 static const AVOption mpeg2_options[] = {
1121     COMMON_OPTS
1122     { "non_linear_quant", "Use nonlinear quantizer.",    OFFSET(q_scale_type),   AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
1123     { "alternate_scan",   "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
1124     { "seq_disp_ext",     "Write sequence_display_extension blocks.", OFFSET(seq_disp_ext), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE, "seq_disp_ext" },
1125     {     "auto",   NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = -1},  0, 0, VE, "seq_disp_ext" },
1126     {     "never",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 0 },  0, 0, VE, "seq_disp_ext" },
1127     {     "always", NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 1 },  0, 0, VE, "seq_disp_ext" },
1128     FF_MPV_COMMON_OPTS
1129     { NULL },
1130 };
1131
1132 #define mpeg12_class(x)                                 \
1133 static const AVClass mpeg ## x ## _class = {            \
1134     .class_name = "mpeg" # x "video encoder",           \
1135     .item_name  = av_default_item_name,                 \
1136     .option     = mpeg ## x ## _options,                \
1137     .version    = LIBAVUTIL_VERSION_INT,                \
1138 };
1139
1140 mpeg12_class(1)
1141 mpeg12_class(2)
1142
1143 AVCodec ff_mpeg1video_encoder = {
1144     .name                 = "mpeg1video",
1145     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
1146     .type                 = AVMEDIA_TYPE_VIDEO,
1147     .id                   = AV_CODEC_ID_MPEG1VIDEO,
1148     .priv_data_size       = sizeof(MpegEncContext),
1149     .init                 = encode_init,
1150     .encode2              = ff_mpv_encode_picture,
1151     .close                = ff_mpv_encode_end,
1152     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
1153     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1154                                                            AV_PIX_FMT_NONE },
1155     .capabilities         = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
1156     .priv_class           = &mpeg1_class,
1157 };
1158
1159 AVCodec ff_mpeg2video_encoder = {
1160     .name                 = "mpeg2video",
1161     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1162     .type                 = AVMEDIA_TYPE_VIDEO,
1163     .id                   = AV_CODEC_ID_MPEG2VIDEO,
1164     .priv_data_size       = sizeof(MpegEncContext),
1165     .init                 = encode_init,
1166     .encode2              = ff_mpv_encode_picture,
1167     .close                = ff_mpv_encode_end,
1168     .supported_framerates = ff_mpeg2_frame_rate_tab,
1169     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1170                                                            AV_PIX_FMT_YUV422P,
1171                                                            AV_PIX_FMT_NONE },
1172     .capabilities         = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
1173     .priv_class           = &mpeg2_class,
1174 };