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

   1 /*
   2  * MPEG-1/2 encoder
   3  * Copyright (c) 2000,2001 Fabrice Bellard
   4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file
  25  * MPEG-1/2 encoder
  26  */
  27
  28 #include <stdint.h>
  29
  30 #include "libavutil/attributes.h"
  31 #include "libavutil/avassert.h"
  32 #include "libavutil/log.h"
  33 #include "libavutil/opt.h"
  34 #include "libavutil/timecode.h"
  35 #include "libavutil/stereo3d.h"
  36
  37 #include "avcodec.h"
  38 #include "bytestream.h"
  39 #include "mathops.h"
  40 #include "mpeg12.h"
  41 #include "mpeg12data.h"
  42 #include "mpegutils.h"
  43 #include "mpegvideo.h"
  44
  45 static const uint8_t svcd_scan_offset_placeholder[] = {
  46     0x10, 0x0E, 0x00, 0x80, 0x81, 0x00, 0x80,
  47     0x81, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  48 };
  49
  50 static uint8_t mv_penalty[MAX_FCODE + 1][MAX_DMV * 2 + 1];
  51 static uint8_t fcode_tab[MAX_MV * 2 + 1];
  52
  53 static uint8_t uni_mpeg1_ac_vlc_len[64 * 64 * 2];
  54 static uint8_t uni_mpeg2_ac_vlc_len[64 * 64 * 2];
  55
  56 /* simple include everything table for dc, first byte is bits
  57  * number next 3 are code */
  58 static uint32_t mpeg1_lum_dc_uni[512];
  59 static uint32_t mpeg1_chr_dc_uni[512];
  60
  61 static uint8_t mpeg1_index_run[2][64];
  62 static int8_t  mpeg1_max_level[2][64];
  63
  64 #define A53_MAX_CC_COUNT 0x1f
  65
  66 static av_cold void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len)
  67 {
  68     int i;
  69
  70     for (i = 0; i < 128; i++) {
  71         int level = i - 64;
  72         int run;
  73         if (!level)
  74             continue;
  75         for (run = 0; run < 64; run++) {
  76             int len, code;
  77             int alevel = FFABS(level);
  78
  79             if (alevel > rl->max_level[0][run])
  80                 code = 111;                         /* rl->n */
  81             else
  82                 code = rl->index_run[0][run] + alevel - 1;
  83
  84             if (code < 111) {                       /* rl->n */
  85                 /* length of VLC and sign */
  86                 len = rl->table_vlc[code][1] + 1;
  87             } else {
  88                 len = rl->table_vlc[111 /* rl->n */][1] + 6;
  89
  90                 if (alevel < 128)
  91                     len += 8;
  92                 else
  93                     len += 16;
  94             }
  95
  96             uni_ac_vlc_len[UNI_AC_ENC_INDEX(run, i)] = len;
  97         }
  98     }
  99 }
 100
 101 static int find_frame_rate_index(MpegEncContext *s)
 102 {
 103     int i;
 104     AVRational bestq = (AVRational) {0, 0};
 105     AVRational ext;
 106     AVRational target = av_inv_q(s->avctx->time_base);
 107
 108     for (i = 1; i < 14; i++) {
 109         if (s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL &&
 110             i >= 9)
 111             break;
 112
 113         for (ext.num=1; ext.num <= 4; ext.num++) {
 114             for (ext.den=1; ext.den <= 32; ext.den++) {
 115                 AVRational q = av_mul_q(ext, ff_mpeg12_frame_rate_tab[i]);
 116
 117                 if (s->codec_id != AV_CODEC_ID_MPEG2VIDEO && (ext.den!=1 || ext.num!=1))
 118                     continue;
 119                 if (av_gcd(ext.den, ext.num) != 1)
 120                     continue;
 121
 122                 if (    bestq.num==0
 123                     || av_nearer_q(target, bestq, q) < 0
 124                     || ext.num==1 && ext.den==1 && av_nearer_q(target, bestq, q) == 0) {
 125                     bestq               = q;
 126                     s->frame_rate_index = i;
 127                     s->mpeg2_frame_rate_ext.num = ext.num;
 128                     s->mpeg2_frame_rate_ext.den = ext.den;
 129                 }
 130             }
 131         }
 132     }
 133
 134     if (av_cmp_q(target, bestq))
 135         return -1;
 136     else
 137         return 0;
 138 }
 139
 140 static av_cold int encode_init(AVCodecContext *avctx)
 141 {
 142     int ret;
 143     MpegEncContext *s = avctx->priv_data;
 144
 145     if ((ret = ff_mpv_encode_init(avctx)) < 0)
 146         return ret;
 147
 148     if (find_frame_rate_index(s) < 0) {
 149         if (s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
 150             av_log(avctx, AV_LOG_ERROR, "MPEG-1/2 does not support %d/%d fps\n",
 151                    avctx->time_base.den, avctx->time_base.num);
 152             return AVERROR(EINVAL);
 153         } else {
 154             av_log(avctx, AV_LOG_INFO,
 155                    "MPEG-1/2 does not support %d/%d fps, there may be AV sync issues\n",
 156                    avctx->time_base.den, avctx->time_base.num);
 157         }
 158     }
 159
 160     if (avctx->profile == FF_PROFILE_UNKNOWN) {
 161         if (avctx->level != FF_LEVEL_UNKNOWN) {
 162             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 163             return AVERROR(EINVAL);
 164         }
 165         /* Main or 4:2:2 */
 166         avctx->profile = s->chroma_format == CHROMA_420 ? FF_PROFILE_MPEG2_MAIN : FF_PROFILE_MPEG2_422;
 167     }
 168
 169     if (avctx->level == FF_LEVEL_UNKNOWN) {
 170         if (avctx->profile == FF_PROFILE_MPEG2_422) {   /* 4:2:2 */
 171             if (avctx->width <= 720 && avctx->height <= 608)
 172                 avctx->level = 5;                   /* Main */
 173             else
 174                 avctx->level = 2;                   /* High */
 175         } else {
 176             if (avctx->profile != FF_PROFILE_MPEG2_HIGH && s->chroma_format != CHROMA_420) {
 177                 av_log(avctx, AV_LOG_ERROR,
 178                        "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 179                 return AVERROR(EINVAL);
 180             }
 181             if (avctx->width <= 720 && avctx->height <= 576)
 182                 avctx->level = 8;                   /* Main */
 183             else if (avctx->width <= 1440)
 184                 avctx->level = 6;                   /* High 1440 */
 185             else
 186                 avctx->level = 4;                   /* High */
 187         }
 188     }
 189
 190     if ((avctx->width & 0xFFF) == 0 && (avctx->height & 0xFFF) == 1) {
 191         av_log(avctx, AV_LOG_ERROR, "Width / Height is invalid for MPEG2\n");
 192         return AVERROR(EINVAL);
 193     }
 194
 195     if (s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
 196         if ((avctx->width & 0xFFF) == 0 || (avctx->height & 0xFFF) == 0) {
 197             av_log(avctx, AV_LOG_ERROR, "Width or Height are not allowed to be multiples of 4096\n"
 198                                         "add '-strict %d' if you want to use them anyway.\n", FF_COMPLIANCE_UNOFFICIAL);
 199             return AVERROR(EINVAL);
 200         }
 201     }
 202
 203     s->drop_frame_timecode = s->drop_frame_timecode || !!(avctx->flags2 & AV_CODEC_FLAG2_DROP_FRAME_TIMECODE);
 204     if (s->drop_frame_timecode)
 205         s->tc.flags |= AV_TIMECODE_FLAG_DROPFRAME;
 206     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 207         av_log(avctx, AV_LOG_ERROR,
 208                "Drop frame time code only allowed with 1001/30000 fps\n");
 209         return AVERROR(EINVAL);
 210     }
 211
 212 #if FF_API_PRIVATE_OPT
 213 FF_DISABLE_DEPRECATION_WARNINGS
 214     if (avctx->timecode_frame_start)
 215         s->timecode_frame_start = avctx->timecode_frame_start;
 216 FF_ENABLE_DEPRECATION_WARNINGS
 217 #endif
 218
 219     if (s->tc_opt_str) {
 220         AVRational rate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 221         int ret = av_timecode_init_from_string(&s->tc, rate, s->tc_opt_str, s);
 222         if (ret < 0)
 223             return ret;
 224         s->drop_frame_timecode = !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME);
 225         s->timecode_frame_start = s->tc.start;
 226     } else {
 227         s->timecode_frame_start = 0; // default is -1
 228     }
 229
 230     return 0;
 231 }
 232
 233 static void put_header(MpegEncContext *s, int header)
 234 {
 235     avpriv_align_put_bits(&s->pb);
 236     put_bits(&s->pb, 16, header >> 16);
 237     put_sbits(&s->pb, 16, header);
 238 }
 239
 240 /* put sequence header if needed */
 241 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 242 {
 243     unsigned int vbv_buffer_size, fps, v;
 244     int i, constraint_parameter_flag;
 245     uint64_t time_code;
 246     int64_t best_aspect_error = INT64_MAX;
 247     AVRational aspect_ratio = s->avctx->sample_aspect_ratio;
 248
 249     if (aspect_ratio.num == 0 || aspect_ratio.den == 0)
 250         aspect_ratio = (AVRational){1,1};             // pixel aspect 1.1 (VGA)
 251
 252     if (s->current_picture.f->key_frame) {
 253         AVRational framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 254
 255         /* MPEG-1 header repeated every GOP */
 256         put_header(s, SEQ_START_CODE);
 257
 258         put_sbits(&s->pb, 12, s->width  & 0xFFF);
 259         put_sbits(&s->pb, 12, s->height & 0xFFF);
 260
 261         for (i = 1; i < 15; i++) {
 262             int64_t error = aspect_ratio.num * (1LL<<32) / aspect_ratio.den;
 263             if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <= 1)
 264                 error -= (1LL<<32) / ff_mpeg1_aspect[i];
 265             else
 266                 error -= (1LL<<32)*ff_mpeg2_aspect[i].num * s->height / s->width / ff_mpeg2_aspect[i].den;
 267
 268             error = FFABS(error);
 269
 270             if (error - 2 <= best_aspect_error) {
 271                 best_aspect_error    = error;
 272                 s->aspect_ratio_info = i;
 273             }
 274         }
 275
 276         put_bits(&s->pb, 4, s->aspect_ratio_info);
 277         put_bits(&s->pb, 4, s->frame_rate_index);
 278
 279         if (s->avctx->rc_max_rate) {
 280             v = (s->avctx->rc_max_rate + 399) / 400;
 281             if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 282                 v = 0x3ffff;
 283         } else {
 284             v = 0x3FFFF;
 285         }
 286
 287         if (s->avctx->rc_buffer_size)
 288             vbv_buffer_size = s->avctx->rc_buffer_size;
 289         else
 290             /* VBV calculation: Scaled so that a VCD has the proper
 291              * VBV size of 40 kilobytes */
 292             vbv_buffer_size = ((20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 293         vbv_buffer_size = (vbv_buffer_size + 16383) / 16384;
 294
 295         put_sbits(&s->pb, 18, v);
 296         put_bits(&s->pb, 1, 1);         // marker
 297         put_sbits(&s->pb, 10, vbv_buffer_size);
 298
 299         constraint_parameter_flag =
 300             s->width  <= 768                                    &&
 301             s->height <= 576                                    &&
 302             s->mb_width * s->mb_height                 <= 396   &&
 303             s->mb_width * s->mb_height * framerate.num <= 396 * 25 * framerate.den &&
 304             framerate.num <= framerate.den * 30                 &&
 305             s->avctx->me_range                                  &&
 306             s->avctx->me_range < 128                            &&
 307             vbv_buffer_size <= 20                               &&
 308             v <= 1856000 / 400                                  &&
 309             s->codec_id == AV_CODEC_ID_MPEG1VIDEO;
 310
 311         put_bits(&s->pb, 1, constraint_parameter_flag);
 312
 313         ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 314         ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 315
 316         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 317             AVFrameSideData *side_data;
 318             int width = s->width;
 319             int height = s->height;
 320             int use_seq_disp_ext;
 321
 322             put_header(s, EXT_START_CODE);
 323             put_bits(&s->pb, 4, 1);                 // seq ext
 324
 325             put_bits(&s->pb, 1, s->avctx->profile == FF_PROFILE_MPEG2_422); // escx 1 for 4:2:2 profile
 326
 327             put_bits(&s->pb, 3, s->avctx->profile); // profile
 328             put_bits(&s->pb, 4, s->avctx->level);   // level
 329
 330             put_bits(&s->pb, 1, s->progressive_sequence);
 331             put_bits(&s->pb, 2, s->chroma_format);
 332             put_bits(&s->pb, 2, s->width  >> 12);
 333             put_bits(&s->pb, 2, s->height >> 12);
 334             put_bits(&s->pb, 12, v >> 18);          // bitrate ext
 335             put_bits(&s->pb, 1, 1);                 // marker
 336             put_bits(&s->pb, 8, vbv_buffer_size >> 10); // vbv buffer ext
 337             put_bits(&s->pb, 1, s->low_delay);
 338             put_bits(&s->pb, 2, s->mpeg2_frame_rate_ext.num-1); // frame_rate_ext_n
 339             put_bits(&s->pb, 5, s->mpeg2_frame_rate_ext.den-1); // frame_rate_ext_d
 340
 341             side_data = av_frame_get_side_data(s->current_picture_ptr->f, AV_FRAME_DATA_PANSCAN);
 342             if (side_data) {
 343                 AVPanScan *pan_scan = (AVPanScan *)side_data->data;
 344                 if (pan_scan->width && pan_scan->height) {
 345                     width = pan_scan->width >> 4;
 346                     height = pan_scan->height >> 4;
 347                 }
 348             }
 349
 350             use_seq_disp_ext = (width != s->width ||
 351                                 height != s->height ||
 352                                 s->avctx->color_primaries != AVCOL_PRI_UNSPECIFIED ||
 353                                 s->avctx->color_trc != AVCOL_TRC_UNSPECIFIED ||
 354                                 s->avctx->colorspace != AVCOL_SPC_UNSPECIFIED ||
 355                                 s->video_format != VIDEO_FORMAT_UNSPECIFIED);
 356
 357             if (s->seq_disp_ext == 1 || (s->seq_disp_ext == -1 && use_seq_disp_ext)) {
 358                 put_header(s, EXT_START_CODE);
 359                 put_bits(&s->pb, 4, 2);                         // sequence display extension
 360                 put_bits(&s->pb, 3, s->video_format);           // video_format
 361                 put_bits(&s->pb, 1, 1);                         // colour_description
 362                 put_bits(&s->pb, 8, s->avctx->color_primaries); // colour_primaries
 363                 put_bits(&s->pb, 8, s->avctx->color_trc);       // transfer_characteristics
 364                 put_bits(&s->pb, 8, s->avctx->colorspace);      // matrix_coefficients
 365                 put_bits(&s->pb, 14, width);                    // display_horizontal_size
 366                 put_bits(&s->pb, 1, 1);                         // marker_bit
 367                 put_bits(&s->pb, 14, height);                   // display_vertical_size
 368                 put_bits(&s->pb, 3, 0);                         // remaining 3 bits are zero padding
 369             }
 370         }
 371
 372         put_header(s, GOP_START_CODE);
 373         put_bits(&s->pb, 1, s->drop_frame_timecode);    // drop frame flag
 374         /* time code: we must convert from the real frame rate to a
 375          * fake MPEG frame rate in case of low frame rate */
 376         fps       = (framerate.num + framerate.den / 2) / framerate.den;
 377         time_code = s->current_picture_ptr->f->coded_picture_number +
 378                     s->timecode_frame_start;
 379
 380         s->gop_picture_number = s->current_picture_ptr->f->coded_picture_number;
 381
 382         av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));
 383         if (s->drop_frame_timecode)
 384             time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);
 385
 386         put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 387         put_bits(&s->pb, 6, (uint32_t)((time_code / (fps *   60)) % 60));
 388         put_bits(&s->pb, 1, 1);
 389         put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 390         put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 391         put_bits(&s->pb, 1, !!(s->avctx->flags & AV_CODEC_FLAG_CLOSED_GOP) || s->intra_only || !s->gop_picture_number);
 392         put_bits(&s->pb, 1, 0);                     // broken link
 393     }
 394 }
 395
 396 static inline void encode_mb_skip_run(MpegEncContext *s, int run)
 397 {
 398     while (run >= 33) {
 399         put_bits(&s->pb, 11, 0x008);
 400         run -= 33;
 401     }
 402     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 403              ff_mpeg12_mbAddrIncrTable[run][0]);
 404 }
 405
 406 static av_always_inline void put_qscale(MpegEncContext *s)
 407 {
 408     put_bits(&s->pb, 5, s->qscale);
 409 }
 410
 411 void ff_mpeg1_encode_slice_header(MpegEncContext *s)
 412 {
 413     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
 414         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 415         /* slice_vertical_position_extension */
 416         put_bits(&s->pb, 3, s->mb_y >> 7);
 417     } else {
 418         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 419     }
 420     put_qscale(s);
 421     /* slice extra information */
 422     put_bits(&s->pb, 1, 0);
 423 }
 424
 425 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 426 {
 427     AVFrameSideData *side_data;
 428     mpeg1_encode_sequence_header(s);
 429
 430     /* MPEG-1 picture header */
 431     put_header(s, PICTURE_START_CODE);
 432     /* temporal reference */
 433
 434     // RAL: s->picture_number instead of s->fake_picture_number
 435     put_bits(&s->pb, 10,
 436              (s->picture_number - s->gop_picture_number) & 0x3ff);
 437     put_bits(&s->pb, 3, s->pict_type);
 438
 439     s->vbv_delay_ptr = s->pb.buf + put_bits_count(&s->pb) / 8;
 440     put_bits(&s->pb, 16, 0xFFFF);               /* vbv_delay */
 441
 442     // RAL: Forward f_code also needed for B-frames
 443     if (s->pict_type == AV_PICTURE_TYPE_P ||
 444         s->pict_type == AV_PICTURE_TYPE_B) {
 445         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 446         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 447             put_bits(&s->pb, 3, s->f_code);     /* forward_f_code */
 448         else
 449             put_bits(&s->pb, 3, 7);             /* forward_f_code */
 450     }
 451
 452     // RAL: Backward f_code necessary for B-frames
 453     if (s->pict_type == AV_PICTURE_TYPE_B) {
 454         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */
 455         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 456             put_bits(&s->pb, 3, s->b_code);     /* backward_f_code */
 457         else
 458             put_bits(&s->pb, 3, 7);             /* backward_f_code */
 459     }
 460
 461     put_bits(&s->pb, 1, 0);                     /* extra bit picture */
 462
 463     s->frame_pred_frame_dct = 1;
 464     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 465         put_header(s, EXT_START_CODE);
 466         put_bits(&s->pb, 4, 8);                 /* pic ext */
 467         if (s->pict_type == AV_PICTURE_TYPE_P ||
 468             s->pict_type == AV_PICTURE_TYPE_B) {
 469             put_bits(&s->pb, 4, s->f_code);
 470             put_bits(&s->pb, 4, s->f_code);
 471         } else {
 472             put_bits(&s->pb, 8, 255);
 473         }
 474         if (s->pict_type == AV_PICTURE_TYPE_B) {
 475             put_bits(&s->pb, 4, s->b_code);
 476             put_bits(&s->pb, 4, s->b_code);
 477         } else {
 478             put_bits(&s->pb, 8, 255);
 479         }
 480         put_bits(&s->pb, 2, s->intra_dc_precision);
 481
 482         av_assert0(s->picture_structure == PICT_FRAME);
 483         put_bits(&s->pb, 2, s->picture_structure);
 484         if (s->progressive_sequence)
 485             put_bits(&s->pb, 1, 0);             /* no repeat */
 486         else
 487             put_bits(&s->pb, 1, s->current_picture_ptr->f->top_field_first);
 488         /* XXX: optimize the generation of this flag with entropy measures */
 489         s->frame_pred_frame_dct = s->progressive_sequence;
 490
 491         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 492         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 493         put_bits(&s->pb, 1, s->q_scale_type);
 494         put_bits(&s->pb, 1, s->intra_vlc_format);
 495         put_bits(&s->pb, 1, s->alternate_scan);
 496         put_bits(&s->pb, 1, s->repeat_first_field);
 497         s->progressive_frame = s->progressive_sequence;
 498         /* chroma_420_type */
 499         put_bits(&s->pb, 1, s->chroma_format ==
 500                             CHROMA_420 ? s->progressive_frame : 0);
 501         put_bits(&s->pb, 1, s->progressive_frame);
 502         put_bits(&s->pb, 1, 0);                 /* composite_display_flag */
 503     }
 504     if (s->scan_offset) {
 505         int i;
 506
 507         put_header(s, USER_START_CODE);
 508         for (i = 0; i < sizeof(svcd_scan_offset_placeholder); i++)
 509             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 510     }
 511     side_data = av_frame_get_side_data(s->current_picture_ptr->f,
 512                                        AV_FRAME_DATA_STEREO3D);
 513     if (side_data) {
 514         AVStereo3D *stereo = (AVStereo3D *)side_data->data;
 515         uint8_t fpa_type;
 516
 517         switch (stereo->type) {
 518         case AV_STEREO3D_SIDEBYSIDE:
 519             fpa_type = 0x03;
 520             break;
 521         case AV_STEREO3D_TOPBOTTOM:
 522             fpa_type = 0x04;
 523             break;
 524         case AV_STEREO3D_2D:
 525             fpa_type = 0x08;
 526             break;
 527         case AV_STEREO3D_SIDEBYSIDE_QUINCUNX:
 528             fpa_type = 0x23;
 529             break;
 530         default:
 531             fpa_type = 0;
 532             break;
 533         }
 534
 535         if (fpa_type != 0) {
 536             put_header(s, USER_START_CODE);
 537             put_bits(&s->pb, 8, 'J');   // S3D_video_format_signaling_identifier
 538             put_bits(&s->pb, 8, 'P');
 539             put_bits(&s->pb, 8, '3');
 540             put_bits(&s->pb, 8, 'D');
 541             put_bits(&s->pb, 8, 0x03);  // S3D_video_format_length
 542
 543             put_bits(&s->pb, 1, 1);     // reserved_bit
 544             put_bits(&s->pb, 7, fpa_type); // S3D_video_format_type
 545             put_bits(&s->pb, 8, 0x04);  // reserved_data[0]
 546             put_bits(&s->pb, 8, 0xFF);  // reserved_data[1]
 547         }
 548     }
 549
 550     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->a53_cc) {
 551         side_data = av_frame_get_side_data(s->current_picture_ptr->f,
 552             AV_FRAME_DATA_A53_CC);
 553         if (side_data) {
 554             if (side_data->size <= A53_MAX_CC_COUNT * 3 && side_data->size % 3 == 0) {
 555                 int i = 0;
 556
 557                 put_header (s, USER_START_CODE);
 558
 559                 put_bits(&s->pb, 8, 'G');                   // user_identifier
 560                 put_bits(&s->pb, 8, 'A');
 561                 put_bits(&s->pb, 8, '9');
 562                 put_bits(&s->pb, 8, '4');
 563                 put_bits(&s->pb, 8, 3);                     // user_data_type_code
 564                 put_bits(&s->pb, 8,
 565                     (side_data->size / 3 & A53_MAX_CC_COUNT) | 0x40); // flags, cc_count
 566                 put_bits(&s->pb, 8, 0xff);                  // em_data
 567
 568                 for (i = 0; i < side_data->size; i++)
 569                     put_bits(&s->pb, 8, side_data->data[i]);
 570
 571                 put_bits(&s->pb, 8, 0xff);                  // marker_bits
 572             } else {
 573                 av_log(s->avctx, AV_LOG_WARNING,
 574                     "Warning Closed Caption size (%d) can not exceed 93 bytes "
 575                     "and must be a multiple of 3\n", side_data->size);
 576             }
 577         }
 578     }
 579
 580     s->mb_y = 0;
 581     ff_mpeg1_encode_slice_header(s);
 582 }
 583
 584 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 585                                 int has_mv, int field_motion)
 586 {
 587     put_bits(&s->pb, n, bits);
 588     if (!s->frame_pred_frame_dct) {
 589         if (has_mv)
 590             /* motion_type: frame/field */
 591             put_bits(&s->pb, 2, 2 - field_motion);
 592         put_bits(&s->pb, 1, s->interlaced_dct);
 593     }
 594 }
 595
 596 // RAL: Parameter added: f_or_b_code
 597 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 598 {
 599     if (val == 0) {
 600         /* zero vector */
 601         put_bits(&s->pb,
 602                  ff_mpeg12_mbMotionVectorTable[0][1],
 603                  ff_mpeg12_mbMotionVectorTable[0][0]);
 604     } else {
 605         int code, sign, bits;
 606         int bit_size = f_or_b_code - 1;
 607         int range    = 1 << bit_size;
 608         /* modulo encoding */
 609         val = sign_extend(val, 5 + bit_size);
 610
 611         if (val >= 0) {
 612             val--;
 613             code = (val >> bit_size) + 1;
 614             bits = val & (range - 1);
 615             sign = 0;
 616         } else {
 617             val = -val;
 618             val--;
 619             code = (val >> bit_size) + 1;
 620             bits = val & (range - 1);
 621             sign = 1;
 622         }
 623
 624         av_assert2(code > 0 && code <= 16);
 625
 626         put_bits(&s->pb,
 627                  ff_mpeg12_mbMotionVectorTable[code][1],
 628                  ff_mpeg12_mbMotionVectorTable[code][0]);
 629
 630         put_bits(&s->pb, 1, sign);
 631         if (bit_size > 0)
 632             put_bits(&s->pb, bit_size, bits);
 633     }
 634 }
 635
 636 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 637 {
 638     unsigned int diff_u = diff + 255;
 639     if (diff_u >= 511) {
 640         int index;
 641
 642         if (diff < 0) {
 643             index = av_log2_16bit(-2 * diff);
 644             diff--;
 645         } else {
 646             index = av_log2_16bit(2 * diff);
 647         }
 648         if (component == 0)
 649             put_bits(&s->pb,
 650                      ff_mpeg12_vlc_dc_lum_bits[index] + index,
 651                      (ff_mpeg12_vlc_dc_lum_code[index] << index) +
 652                      av_mod_uintp2(diff, index));
 653         else
 654             put_bits(&s->pb,
 655                      ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 656                      (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
 657                      av_mod_uintp2(diff, index));
 658     } else {
 659         if (component == 0)
 660             put_bits(&s->pb,
 661                      mpeg1_lum_dc_uni[diff + 255] & 0xFF,
 662                      mpeg1_lum_dc_uni[diff + 255] >> 8);
 663         else
 664             put_bits(&s->pb,
 665                      mpeg1_chr_dc_uni[diff + 255] & 0xFF,
 666                      mpeg1_chr_dc_uni[diff + 255] >> 8);
 667     }
 668 }
 669
 670 static void mpeg1_encode_block(MpegEncContext *s, int16_t *block, int n)
 671 {
 672     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 673     int code, component;
 674     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 675
 676     last_index = s->block_last_index[n];
 677
 678     /* DC coef */
 679     if (s->mb_intra) {
 680         component = (n <= 3 ? 0 : (n & 1) + 1);
 681         dc        = block[0];                   /* overflow is impossible */
 682         diff      = dc - s->last_dc[component];
 683         encode_dc(s, diff, component);
 684         s->last_dc[component] = dc;
 685         i = 1;
 686         if (s->intra_vlc_format)
 687             table_vlc = ff_rl_mpeg2.table_vlc;
 688     } else {
 689         /* encode the first coefficient: needs to be done here because
 690          * it is handled slightly differently */
 691         level = block[0];
 692         if (abs(level) == 1) {
 693             code = ((uint32_t)level >> 31);     /* the sign bit */
 694             put_bits(&s->pb, 2, code | 0x02);
 695             i = 1;
 696         } else {
 697             i             = 0;
 698             last_non_zero = -1;
 699             goto next_coef;
 700         }
 701     }
 702
 703     /* now quantify & encode AC coefs */
 704     last_non_zero = i - 1;
 705
 706     for (; i <= last_index; i++) {
 707         j     = s->intra_scantable.permutated[i];
 708         level = block[j];
 709
 710 next_coef:
 711         /* encode using VLC */
 712         if (level != 0) {
 713             run = i - last_non_zero - 1;
 714
 715             alevel = level;
 716             MASK_ABS(sign, alevel);
 717             sign &= 1;
 718
 719             if (alevel <= mpeg1_max_level[0][run]) {
 720                 code = mpeg1_index_run[0][run] + alevel - 1;
 721                 /* store the VLC & sign at once */
 722                 put_bits(&s->pb, table_vlc[code][1] + 1,
 723                          (table_vlc[code][0] << 1) + sign);
 724             } else {
 725                 /* escape seems to be pretty rare <5% so I do not optimize it */
 726                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 727                 /* escape: only clip in this case */
 728                 put_bits(&s->pb, 6, run);
 729                 if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
 730                     if (alevel < 128) {
 731                         put_sbits(&s->pb, 8, level);
 732                     } else {
 733                         if (level < 0)
 734                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 735                         else
 736                             put_sbits(&s->pb, 16, level);
 737                     }
 738                 } else {
 739                     put_sbits(&s->pb, 12, level);
 740                 }
 741             }
 742             last_non_zero = i;
 743         }
 744     }
 745     /* end of block */
 746     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 747 }
 748
 749 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 750                                                       int16_t block[8][64],
 751                                                       int motion_x, int motion_y,
 752                                                       int mb_block_count)
 753 {
 754     int i, cbp;
 755     const int mb_x     = s->mb_x;
 756     const int mb_y     = s->mb_y;
 757     const int first_mb = mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 758
 759     /* compute cbp */
 760     cbp = 0;
 761     for (i = 0; i < mb_block_count; i++)
 762         if (s->block_last_index[i] >= 0)
 763             cbp |= 1 << (mb_block_count - 1 - i);
 764
 765     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 766         (mb_x != s->mb_width - 1 ||
 767          (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
 768         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 769          (s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir &&
 770           (((s->mv_dir & MV_DIR_FORWARD)
 771             ? ((s->mv[0][0][0] - s->last_mv[0][0][0]) |
 772                (s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
 773            ((s->mv_dir & MV_DIR_BACKWARD)
 774             ? ((s->mv[1][0][0] - s->last_mv[1][0][0]) |
 775                (s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
 776         s->mb_skip_run++;
 777         s->qscale -= s->dquant;
 778         s->skip_count++;
 779         s->misc_bits++;
 780         s->last_bits++;
 781         if (s->pict_type == AV_PICTURE_TYPE_P) {
 782             s->last_mv[0][0][0] =
 783             s->last_mv[0][0][1] =
 784             s->last_mv[0][1][0] =
 785             s->last_mv[0][1][1] = 0;
 786         }
 787     } else {
 788         if (first_mb) {
 789             av_assert0(s->mb_skip_run == 0);
 790             encode_mb_skip_run(s, s->mb_x);
 791         } else {
 792             encode_mb_skip_run(s, s->mb_skip_run);
 793         }
 794
 795         if (s->pict_type == AV_PICTURE_TYPE_I) {
 796             if (s->dquant && cbp) {
 797                 /* macroblock_type: macroblock_quant = 1 */
 798                 put_mb_modes(s, 2, 1, 0, 0);
 799                 put_qscale(s);
 800             } else {
 801                 /* macroblock_type: macroblock_quant = 0 */
 802                 put_mb_modes(s, 1, 1, 0, 0);
 803                 s->qscale -= s->dquant;
 804             }
 805             s->misc_bits += get_bits_diff(s);
 806             s->i_count++;
 807         } else if (s->mb_intra) {
 808             if (s->dquant && cbp) {
 809                 put_mb_modes(s, 6, 0x01, 0, 0);
 810                 put_qscale(s);
 811             } else {
 812                 put_mb_modes(s, 5, 0x03, 0, 0);
 813                 s->qscale -= s->dquant;
 814             }
 815             s->misc_bits += get_bits_diff(s);
 816             s->i_count++;
 817             memset(s->last_mv, 0, sizeof(s->last_mv));
 818         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 819             if (s->mv_type == MV_TYPE_16X16) {
 820                 if (cbp != 0) {
 821                     if ((motion_x | motion_y) == 0) {
 822                         if (s->dquant) {
 823                             /* macroblock_pattern & quant */
 824                             put_mb_modes(s, 5, 1, 0, 0);
 825                             put_qscale(s);
 826                         } else {
 827                             /* macroblock_pattern only */
 828                             put_mb_modes(s, 2, 1, 0, 0);
 829                         }
 830                         s->misc_bits += get_bits_diff(s);
 831                     } else {
 832                         if (s->dquant) {
 833                             put_mb_modes(s, 5, 2, 1, 0);    /* motion + cbp */
 834                             put_qscale(s);
 835                         } else {
 836                             put_mb_modes(s, 1, 1, 1, 0);    /* motion + cbp */
 837                         }
 838                         s->misc_bits += get_bits_diff(s);
 839                         // RAL: f_code parameter added
 840                         mpeg1_encode_motion(s,
 841                                             motion_x - s->last_mv[0][0][0],
 842                                             s->f_code);
 843                         // RAL: f_code parameter added
 844                         mpeg1_encode_motion(s,
 845                                             motion_y - s->last_mv[0][0][1],
 846                                             s->f_code);
 847                         s->mv_bits += get_bits_diff(s);
 848                     }
 849                 } else {
 850                     put_bits(&s->pb, 3, 1);         /* motion only */
 851                     if (!s->frame_pred_frame_dct)
 852                         put_bits(&s->pb, 2, 2);     /* motion_type: frame */
 853                     s->misc_bits += get_bits_diff(s);
 854                     // RAL: f_code parameter added
 855                     mpeg1_encode_motion(s,
 856                                         motion_x - s->last_mv[0][0][0],
 857                                         s->f_code);
 858                     // RAL: f_code parameter added
 859                     mpeg1_encode_motion(s,
 860                                         motion_y - s->last_mv[0][0][1],
 861                                         s->f_code);
 862                     s->qscale  -= s->dquant;
 863                     s->mv_bits += get_bits_diff(s);
 864                 }
 865                 s->last_mv[0][1][0] = s->last_mv[0][0][0] = motion_x;
 866                 s->last_mv[0][1][1] = s->last_mv[0][0][1] = motion_y;
 867             } else {
 868                 av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 869
 870                 if (cbp) {
 871                     if (s->dquant) {
 872                         put_mb_modes(s, 5, 2, 1, 1);    /* motion + cbp */
 873                         put_qscale(s);
 874                     } else {
 875                         put_mb_modes(s, 1, 1, 1, 1);    /* motion + cbp */
 876                     }
 877                 } else {
 878                     put_bits(&s->pb, 3, 1);             /* motion only */
 879                     put_bits(&s->pb, 2, 1);             /* motion_type: field */
 880                     s->qscale -= s->dquant;
 881                 }
 882                 s->misc_bits += get_bits_diff(s);
 883                 for (i = 0; i < 2; i++) {
 884                     put_bits(&s->pb, 1, s->field_select[0][i]);
 885                     mpeg1_encode_motion(s,
 886                                         s->mv[0][i][0] - s->last_mv[0][i][0],
 887                                         s->f_code);
 888                     mpeg1_encode_motion(s,
 889                                         s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 890                                         s->f_code);
 891                     s->last_mv[0][i][0] = s->mv[0][i][0];
 892                     s->last_mv[0][i][1] = 2 * s->mv[0][i][1];
 893                 }
 894                 s->mv_bits += get_bits_diff(s);
 895             }
 896             if (cbp) {
 897                 if (s->chroma_y_shift) {
 898                     put_bits(&s->pb,
 899                              ff_mpeg12_mbPatTable[cbp][1],
 900                              ff_mpeg12_mbPatTable[cbp][0]);
 901                 } else {
 902                     put_bits(&s->pb,
 903                              ff_mpeg12_mbPatTable[cbp >> 2][1],
 904                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
 905                     put_sbits(&s->pb, 2, cbp);
 906                 }
 907             }
 908             s->f_count++;
 909         } else {
 910             if (s->mv_type == MV_TYPE_16X16) {
 911                 if (cbp) {                      // With coded bloc pattern
 912                     if (s->dquant) {
 913                         if (s->mv_dir == MV_DIR_FORWARD)
 914                             put_mb_modes(s, 6, 3, 1, 0);
 915                         else
 916                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 0);
 917                         put_qscale(s);
 918                     } else {
 919                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 0);
 920                     }
 921                 } else {                        // No coded bloc pattern
 922                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 923                     if (!s->frame_pred_frame_dct)
 924                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 925                     s->qscale -= s->dquant;
 926                 }
 927                 s->misc_bits += get_bits_diff(s);
 928                 if (s->mv_dir & MV_DIR_FORWARD) {
 929                     mpeg1_encode_motion(s,
 930                                         s->mv[0][0][0] - s->last_mv[0][0][0],
 931                                         s->f_code);
 932                     mpeg1_encode_motion(s,
 933                                         s->mv[0][0][1] - s->last_mv[0][0][1],
 934                                         s->f_code);
 935                     s->last_mv[0][0][0] =
 936                     s->last_mv[0][1][0] = s->mv[0][0][0];
 937                     s->last_mv[0][0][1] =
 938                     s->last_mv[0][1][1] = s->mv[0][0][1];
 939                     s->f_count++;
 940                 }
 941                 if (s->mv_dir & MV_DIR_BACKWARD) {
 942                     mpeg1_encode_motion(s,
 943                                         s->mv[1][0][0] - s->last_mv[1][0][0],
 944                                         s->b_code);
 945                     mpeg1_encode_motion(s,
 946                                         s->mv[1][0][1] - s->last_mv[1][0][1],
 947                                         s->b_code);
 948                     s->last_mv[1][0][0] =
 949                     s->last_mv[1][1][0] = s->mv[1][0][0];
 950                     s->last_mv[1][0][1] =
 951                     s->last_mv[1][1][1] = s->mv[1][0][1];
 952                     s->b_count++;
 953                 }
 954             } else {
 955                 av_assert2(s->mv_type == MV_TYPE_FIELD);
 956                 av_assert2(!s->frame_pred_frame_dct);
 957                 if (cbp) {                      // With coded bloc pattern
 958                     if (s->dquant) {
 959                         if (s->mv_dir == MV_DIR_FORWARD)
 960                             put_mb_modes(s, 6, 3, 1, 1);
 961                         else
 962                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 1);
 963                         put_qscale(s);
 964                     } else {
 965                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 1);
 966                     }
 967                 } else {                        // No coded bloc pattern
 968                     put_bits(&s->pb, 5 - s->mv_dir, 2);
 969                     put_bits(&s->pb, 2, 1);     /* motion_type: field */
 970                     s->qscale -= s->dquant;
 971                 }
 972                 s->misc_bits += get_bits_diff(s);
 973                 if (s->mv_dir & MV_DIR_FORWARD) {
 974                     for (i = 0; i < 2; i++) {
 975                         put_bits(&s->pb, 1, s->field_select[0][i]);
 976                         mpeg1_encode_motion(s,
 977                                             s->mv[0][i][0] - s->last_mv[0][i][0],
 978                                             s->f_code);
 979                         mpeg1_encode_motion(s,
 980                                             s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
 981                                             s->f_code);
 982                         s->last_mv[0][i][0] = s->mv[0][i][0];
 983                         s->last_mv[0][i][1] = s->mv[0][i][1] * 2;
 984                     }
 985                     s->f_count++;
 986                 }
 987                 if (s->mv_dir & MV_DIR_BACKWARD) {
 988                     for (i = 0; i < 2; i++) {
 989                         put_bits(&s->pb, 1, s->field_select[1][i]);
 990                         mpeg1_encode_motion(s,
 991                                             s->mv[1][i][0] - s->last_mv[1][i][0],
 992                                             s->b_code);
 993                         mpeg1_encode_motion(s,
 994                                             s->mv[1][i][1] - (s->last_mv[1][i][1] >> 1),
 995                                             s->b_code);
 996                         s->last_mv[1][i][0] = s->mv[1][i][0];
 997                         s->last_mv[1][i][1] = s->mv[1][i][1] * 2;
 998                     }
 999                     s->b_count++;
1000                 }
1001             }
1002             s->mv_bits += get_bits_diff(s);
1003             if (cbp) {
1004                 if (s->chroma_y_shift) {
1005                     put_bits(&s->pb,
1006                              ff_mpeg12_mbPatTable[cbp][1],
1007                              ff_mpeg12_mbPatTable[cbp][0]);
1008                 } else {
1009                     put_bits(&s->pb,
1010                              ff_mpeg12_mbPatTable[cbp >> 2][1],
1011                              ff_mpeg12_mbPatTable[cbp >> 2][0]);
1012                     put_sbits(&s->pb, 2, cbp);
1013                 }
1014             }
1015         }
1016         for (i = 0; i < mb_block_count; i++)
1017             if (cbp & (1 << (mb_block_count - 1 - i)))
1018                 mpeg1_encode_block(s, block[i], i);
1019         s->mb_skip_run = 0;
1020         if (s->mb_intra)
1021             s->i_tex_bits += get_bits_diff(s);
1022         else
1023             s->p_tex_bits += get_bits_diff(s);
1024     }
1025 }
1026
1027 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
1028                         int motion_x, int motion_y)
1029 {
1030     if (s->chroma_format == CHROMA_420)
1031         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
1032     else
1033         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
1034 }
1035
1036 av_cold void ff_mpeg1_encode_init(MpegEncContext *s)
1037 {
1038     static int done = 0;
1039
1040     ff_mpeg12_common_init(s);
1041
1042     if (!done) {
1043         int f_code;
1044         int mv;
1045         int i;
1046
1047         done = 1;
1048         ff_rl_init(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
1049         ff_rl_init(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
1050
1051         for (i = 0; i < 64; i++) {
1052             mpeg1_max_level[0][i] = ff_rl_mpeg1.max_level[0][i];
1053             mpeg1_index_run[0][i] = ff_rl_mpeg1.index_run[0][i];
1054         }
1055
1056         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
1057         if (s->intra_vlc_format)
1058             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
1059
1060         /* build unified dc encoding tables */
1061         for (i = -255; i < 256; i++) {
1062             int adiff, index;
1063             int bits, code;
1064             int diff = i;
1065
1066             adiff = FFABS(diff);
1067             if (diff < 0)
1068                 diff--;
1069             index = av_log2(2 * adiff);
1070
1071             bits = ff_mpeg12_vlc_dc_lum_bits[index] + index;
1072             code = (ff_mpeg12_vlc_dc_lum_code[index] << index) +
1073                     av_mod_uintp2(diff, index);
1074             mpeg1_lum_dc_uni[i + 255] = bits + (code << 8);
1075
1076             bits = ff_mpeg12_vlc_dc_chroma_bits[index] + index;
1077             code = (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
1078                     av_mod_uintp2(diff, index);
1079             mpeg1_chr_dc_uni[i + 255] = bits + (code << 8);
1080         }
1081
1082         for (f_code = 1; f_code <= MAX_FCODE; f_code++)
1083             for (mv = -MAX_DMV; mv <= MAX_DMV; mv++) {
1084                 int len;
1085
1086                 if (mv == 0) {
1087                     len = ff_mpeg12_mbMotionVectorTable[0][1];
1088                 } else {
1089                     int val, bit_size, code;
1090
1091                     bit_size = f_code - 1;
1092
1093                     val = mv;
1094                     if (val < 0)
1095                         val = -val;
1096                     val--;
1097                     code = (val >> bit_size) + 1;
1098                     if (code < 17)
1099                         len = ff_mpeg12_mbMotionVectorTable[code][1] +
1100                               1 + bit_size;
1101                     else
1102                         len = ff_mpeg12_mbMotionVectorTable[16][1] +
1103                               2 + bit_size;
1104                 }
1105
1106                 mv_penalty[f_code][mv + MAX_DMV] = len;
1107             }
1108
1109
1110         for (f_code = MAX_FCODE; f_code > 0; f_code--)
1111             for (mv = -(8 << f_code); mv < (8 << f_code); mv++)
1112                 fcode_tab[mv + MAX_MV] = f_code;
1113     }
1114     s->me.mv_penalty = mv_penalty;
1115     s->fcode_tab     = fcode_tab;
1116     if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1117         s->min_qcoeff = -255;
1118         s->max_qcoeff = 255;
1119     } else {
1120         s->min_qcoeff = -2047;
1121         s->max_qcoeff = 2047;
1122     }
1123     if (s->intra_vlc_format) {
1124         s->intra_ac_vlc_length      =
1125         s->intra_ac_vlc_last_length = uni_mpeg2_ac_vlc_len;
1126     } else {
1127         s->intra_ac_vlc_length      =
1128         s->intra_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1129     }
1130     s->inter_ac_vlc_length      =
1131     s->inter_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
1132 }
1133
1134 #define OFFSET(x) offsetof(MpegEncContext, x)
1135 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
1136 #define COMMON_OPTS                                                           \
1137     { "gop_timecode",        "MPEG GOP Timecode in hh:mm:ss[:;.]ff format. Overrides timecode_frame_start.",   \
1138       OFFSET(tc_opt_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, VE },\
1139     { "intra_vlc",           "Use MPEG-2 intra VLC table.",                   \
1140       OFFSET(intra_vlc_format),    AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE }, \
1141     { "drop_frame_timecode", "Timecode is in drop frame format.",             \
1142       OFFSET(drop_frame_timecode), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE }, \
1143     { "scan_offset",         "Reserve space for SVCD scan offset user data.", \
1144       OFFSET(scan_offset),         AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE }, \
1145     { "timecode_frame_start", "GOP timecode frame start number, in non-drop-frame format", \
1146       OFFSET(timecode_frame_start), AV_OPT_TYPE_INT64, {.i64 = -1 }, -1, INT64_MAX, VE}, \
1147
1148 static const AVOption mpeg1_options[] = {
1149     COMMON_OPTS
1150     FF_MPV_COMMON_OPTS
1151     { NULL },
1152 };
1153
1154 static const AVOption mpeg2_options[] = {
1155     COMMON_OPTS
1156     { "non_linear_quant", "Use nonlinear quantizer.",    OFFSET(q_scale_type),   AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
1157     { "alternate_scan",   "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
1158     { "seq_disp_ext",     "Write sequence_display_extension blocks.", OFFSET(seq_disp_ext), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE, "seq_disp_ext" },
1159     {     "auto",   NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = -1},  0, 0, VE, "seq_disp_ext" },
1160     {     "never",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 0 },  0, 0, VE, "seq_disp_ext" },
1161     {     "always", NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 1 },  0, 0, VE, "seq_disp_ext" },
1162     { "video_format",     "Video_format in the sequence_display_extension indicating the source of the video.", OFFSET(video_format), AV_OPT_TYPE_INT, { .i64 = VIDEO_FORMAT_UNSPECIFIED }, 0, 7, VE, "video_format" },
1163     {     "component",    NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_COMPONENT  },  0, 0, VE, "video_format" },
1164     {     "pal",          NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_PAL        },  0, 0, VE, "video_format" },
1165     {     "ntsc",         NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_NTSC       },  0, 0, VE, "video_format" },
1166     {     "secam",        NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_SECAM      },  0, 0, VE, "video_format" },
1167     {     "mac",          NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_MAC        },  0, 0, VE, "video_format" },
1168     {     "unspecified",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = VIDEO_FORMAT_UNSPECIFIED},  0, 0, VE, "video_format" },
1169     FF_MPV_COMMON_OPTS
1170     { NULL },
1171 };
1172
1173 #define mpeg12_class(x)                                 \
1174 static const AVClass mpeg ## x ## _class = {            \
1175     .class_name = "mpeg" # x "video encoder",           \
1176     .item_name  = av_default_item_name,                 \
1177     .option     = mpeg ## x ## _options,                \
1178     .version    = LIBAVUTIL_VERSION_INT,                \
1179 };
1180
1181 mpeg12_class(1)
1182 mpeg12_class(2)
1183
1184 AVCodec ff_mpeg1video_encoder = {
1185     .name                 = "mpeg1video",
1186     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
1187     .type                 = AVMEDIA_TYPE_VIDEO,
1188     .id                   = AV_CODEC_ID_MPEG1VIDEO,
1189     .priv_data_size       = sizeof(MpegEncContext),
1190     .init                 = encode_init,
1191     .encode2              = ff_mpv_encode_picture,
1192     .close                = ff_mpv_encode_end,
1193     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
1194     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1195                                                            AV_PIX_FMT_NONE },
1196     .capabilities         = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
1197     .caps_internal        = FF_CODEC_CAP_INIT_CLEANUP,
1198     .priv_class           = &mpeg1_class,
1199 };
1200
1201 AVCodec ff_mpeg2video_encoder = {
1202     .name                 = "mpeg2video",
1203     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1204     .type                 = AVMEDIA_TYPE_VIDEO,
1205     .id                   = AV_CODEC_ID_MPEG2VIDEO,
1206     .priv_data_size       = sizeof(MpegEncContext),
1207     .init                 = encode_init,
1208     .encode2              = ff_mpv_encode_picture,
1209     .close                = ff_mpv_encode_end,
1210     .supported_framerates = ff_mpeg2_frame_rate_tab,
1211     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
1212                                                            AV_PIX_FMT_YUV422P,
1213                                                            AV_PIX_FMT_NONE },
1214     .capabilities         = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
1215     .caps_internal        = FF_CODEC_CAP_INIT_CLEANUP,
1216     .priv_class           = &mpeg2_class,
1217 };