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

   1 /*
   2  * MPEG1/2 encoder
   3  * Copyright (c) 2000,2001 Fabrice Bellard
   4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file
  25  * MPEG1/2 encoder
  26  */
  27
  28 #include "avcodec.h"
  29 #include "dsputil.h"
  30 #include "mathops.h"
  31 #include "mpegvideo.h"
  32
  33 #include "mpeg12.h"
  34 #include "mpeg12data.h"
  35 #include "bytestream.h"
  36 #include "libavutil/log.h"
  37 #include "libavutil/opt.h"
  38 #include "libavutil/avassert.h"
  39 #include "libavutil/timecode.h"
  40
  41 static const uint8_t inv_non_linear_qscale[13] = {
  42     0, 2, 4, 6, 8,
  43     9,10,11,12,13,14,15,16,
  44 };
  45
  46 static const uint8_t svcd_scan_offset_placeholder[14] = {
  47     0x10, 0x0E,
  48     0x00, 0x80, 0x81,
  49     0x00, 0x80, 0x81,
  50     0xff, 0xff, 0xff,
  51     0xff, 0xff, 0xff,
  52 };
  53
  54 static void mpeg1_encode_block(MpegEncContext *s,
  55                          DCTELEM *block,
  56                          int component);
  57 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
  58
  59 static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
  60 static uint8_t fcode_tab[MAX_MV*2+1];
  61
  62 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
  63 static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
  64
  65 /* simple include everything table for dc, first byte is bits number next 3 are code*/
  66 static uint32_t mpeg1_lum_dc_uni[512];
  67 static uint32_t mpeg1_chr_dc_uni[512];
  68
  69 static uint8_t mpeg1_index_run[2][64];
  70 static int8_t mpeg1_max_level[2][64];
  71
  72 static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
  73     int i;
  74
  75     for(i=0; i<128; i++){
  76         int level= i-64;
  77         int run;
  78         if (!level)
  79             continue;
  80         for(run=0; run<64; run++){
  81             int len, code;
  82
  83             int alevel= FFABS(level);
  84
  85             if (alevel > rl->max_level[0][run])
  86                 code= 111; /*rl->n*/
  87             else
  88                 code= rl->index_run[0][run] + alevel - 1;
  89
  90             if (code < 111 /* rl->n */) {
  91                 /* length of vlc and sign */
  92                 len=   rl->table_vlc[code][1]+1;
  93             } else {
  94                 len=  rl->table_vlc[111/*rl->n*/][1]+6;
  95
  96                 if (alevel < 128) {
  97                     len += 8;
  98                 } else {
  99                     len += 16;
 100                 }
 101             }
 102
 103             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
 104         }
 105     }
 106 }
 107
 108
 109 static int find_frame_rate_index(MpegEncContext *s){
 110     int i;
 111     AVRational bestq= (AVRational){0, 0};
 112     AVRational ext;
 113     AVRational target = av_inv_q(s->avctx->time_base);
 114
 115     for(i=1;i<14;i++) {
 116         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL && i>=9) break;
 117
 118         for (ext.num=1; ext.num <= 4; ext.num++) {
 119             for (ext.den=1; ext.den <= 32; ext.den++) {
 120                 AVRational q = av_mul_q(ext, ff_mpeg12_frame_rate_tab[i]);
 121
 122                 if(s->codec_id != AV_CODEC_ID_MPEG2VIDEO && (ext.den!=1 || ext.num!=1))
 123                     continue;
 124                 if(av_gcd(ext.den, ext.num) != 1)
 125                     continue;
 126
 127                 if(    bestq.num==0
 128                     || av_nearer_q(target, bestq, q) < 0
 129                     || ext.num==1 && ext.den==1 && av_nearer_q(target, bestq, q) == 0){
 130                     bestq = q;
 131                     s->frame_rate_index= i;
 132                     s->mpeg2_frame_rate_ext.num = ext.num;
 133                     s->mpeg2_frame_rate_ext.den = ext.den;
 134                 }
 135             }
 136         }
 137     }
 138     if(av_cmp_q(target, bestq))
 139         return -1;
 140     else
 141         return 0;
 142 }
 143
 144 static av_cold int encode_init(AVCodecContext *avctx)
 145 {
 146     MpegEncContext *s = avctx->priv_data;
 147
 148     if(ff_MPV_encode_init(avctx) < 0)
 149         return -1;
 150
 151     if(find_frame_rate_index(s) < 0){
 152         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
 153             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
 154             return -1;
 155         }else{
 156             av_log(avctx, AV_LOG_INFO, "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n", avctx->time_base.den, avctx->time_base.num);
 157         }
 158     }
 159
 160     if(avctx->profile == FF_PROFILE_UNKNOWN){
 161         if(avctx->level != FF_LEVEL_UNKNOWN){
 162             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 163             return -1;
 164         }
 165         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
 166     }
 167
 168     if(avctx->level == FF_LEVEL_UNKNOWN){
 169         if(avctx->profile == 0){ /* 4:2:2 */
 170             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
 171             else                                            avctx->level = 2; /* High */
 172         }else{
 173             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
 174                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 175                 return -1;
 176             }
 177             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
 178             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
 179             else                                            avctx->level = 4; /* High */
 180         }
 181     }
 182
 183     s->drop_frame_timecode = s->drop_frame_timecode || !!(avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE);
 184     if (s->drop_frame_timecode)
 185         s->tc.flags |= AV_TIMECODE_FLAG_DROPFRAME;
 186     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 187         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 188         return -1;
 189     }
 190
 191     if (s->tc_opt_str) {
 192         AVRational rate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 193         int ret = av_timecode_init_from_string(&s->tc, rate, s->tc_opt_str, s);
 194         if (ret < 0)
 195             return ret;
 196         s->drop_frame_timecode = !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME);
 197         s->avctx->timecode_frame_start = s->tc.start;
 198     } else {
 199         s->avctx->timecode_frame_start = 0; // default is -1
 200     }
 201     return 0;
 202 }
 203
 204 static void put_header(MpegEncContext *s, int header)
 205 {
 206     avpriv_align_put_bits(&s->pb);
 207     put_bits(&s->pb, 16, header>>16);
 208     put_sbits(&s->pb, 16, header);
 209 }
 210
 211 /* put sequence header if needed */
 212 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 213 {
 214         unsigned int vbv_buffer_size;
 215         unsigned int fps, v;
 216         int i;
 217         uint64_t time_code;
 218         float best_aspect_error= 1E10;
 219         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 220         int constraint_parameter_flag;
 221
 222         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 223
 224         if (s->current_picture.f.key_frame) {
 225             AVRational framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 226
 227             /* mpeg1 header repeated every gop */
 228             put_header(s, SEQ_START_CODE);
 229
 230             put_sbits(&s->pb, 12, s->width );
 231             put_sbits(&s->pb, 12, s->height);
 232
 233             for(i=1; i<15; i++){
 234                 float error= aspect_ratio;
 235                 if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <=1)
 236                     error-= 1.0/ff_mpeg1_aspect[i];
 237                 else
 238                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
 239
 240                 error= FFABS(error);
 241
 242                 if(error < best_aspect_error){
 243                     best_aspect_error= error;
 244                     s->aspect_ratio_info= i;
 245                 }
 246             }
 247
 248             put_bits(&s->pb, 4, s->aspect_ratio_info);
 249             put_bits(&s->pb, 4, s->frame_rate_index);
 250
 251             if(s->avctx->rc_max_rate){
 252                 v = (s->avctx->rc_max_rate + 399) / 400;
 253                 if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 254                     v = 0x3ffff;
 255             }else{
 256                 v= 0x3FFFF;
 257             }
 258
 259             if(s->avctx->rc_buffer_size)
 260                 vbv_buffer_size = s->avctx->rc_buffer_size;
 261             else
 262                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 263                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 264             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 265
 266             put_sbits(&s->pb, 18, v);
 267             put_bits(&s->pb, 1, 1); /* marker */
 268             put_sbits(&s->pb, 10, vbv_buffer_size);
 269
 270             constraint_parameter_flag=
 271                 s->width <= 768 && s->height <= 576 &&
 272                 s->mb_width * s->mb_height <= 396 &&
 273                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 274                 framerate.num <= framerate.den*30 &&
 275                 s->avctx->me_range && s->avctx->me_range < 128 &&
 276                 vbv_buffer_size <= 20 &&
 277                 v <= 1856000/400 &&
 278                 s->codec_id == AV_CODEC_ID_MPEG1VIDEO;
 279
 280             put_bits(&s->pb, 1, constraint_parameter_flag);
 281
 282             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 283             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 284
 285             if(s->codec_id == AV_CODEC_ID_MPEG2VIDEO){
 286                 put_header(s, EXT_START_CODE);
 287                 put_bits(&s->pb, 4, 1); //seq ext
 288
 289                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 290
 291                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 292                 put_bits(&s->pb, 4, s->avctx->level); //level
 293
 294                 put_bits(&s->pb, 1, s->progressive_sequence);
 295                 put_bits(&s->pb, 2, s->chroma_format);
 296                 put_bits(&s->pb, 2, s->width >>12);
 297                 put_bits(&s->pb, 2, s->height>>12);
 298                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 299                 put_bits(&s->pb, 1, 1); //marker
 300                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 301                 put_bits(&s->pb, 1, s->low_delay);
 302                 put_bits(&s->pb, 2, s->mpeg2_frame_rate_ext.num-1); // frame_rate_ext_n
 303                 put_bits(&s->pb, 5, s->mpeg2_frame_rate_ext.den-1); // frame_rate_ext_d
 304             }
 305
 306             put_header(s, GOP_START_CODE);
 307             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
 308             /* time code : we must convert from the real frame rate to a
 309                fake mpeg frame rate in case of low frame rate */
 310             fps = (framerate.num + framerate.den/2)/ framerate.den;
 311             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
 312
 313             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 314             av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));
 315             if (s->drop_frame_timecode)
 316                 time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);
 317             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 318             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 319             put_bits(&s->pb, 1, 1);
 320             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 321             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 322             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 323             put_bits(&s->pb, 1, 0); /* broken link */
 324         }
 325 }
 326
 327 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 328     while (run >= 33) {
 329         put_bits(&s->pb, 11, 0x008);
 330         run -= 33;
 331     }
 332     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 333              ff_mpeg12_mbAddrIncrTable[run][0]);
 334 }
 335
 336 static av_always_inline void put_qscale(MpegEncContext *s)
 337 {
 338     if(s->q_scale_type){
 339         av_assert2(s->qscale>=1 && s->qscale <=12);
 340         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 341     }else{
 342         put_bits(&s->pb, 5, s->qscale);
 343     }
 344 }
 345
 346 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 347     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
 348         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 349         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
 350     } else {
 351         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 352     }
 353     put_qscale(s);
 354     put_bits(&s->pb, 1, 0); /* slice extra information */
 355 }
 356
 357 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 358 {
 359     mpeg1_encode_sequence_header(s);
 360
 361     /* mpeg1 picture header */
 362     put_header(s, PICTURE_START_CODE);
 363     /* temporal reference */
 364
 365     // RAL: s->picture_number instead of s->fake_picture_number
 366     put_bits(&s->pb, 10, (s->picture_number -
 367                           s->gop_picture_number) & 0x3ff);
 368     put_bits(&s->pb, 3, s->pict_type);
 369
 370     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 371     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 372
 373     // RAL: Forward f_code also needed for B frames
 374     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 375         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 376         if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 377             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 378         else
 379             put_bits(&s->pb, 3, 7); /* forward_f_code */
 380     }
 381
 382     // RAL: Backward f_code necessary for B frames
 383     if (s->pict_type == AV_PICTURE_TYPE_B) {
 384         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 385         if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 386             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 387         else
 388             put_bits(&s->pb, 3, 7); /* backward_f_code */
 389     }
 390
 391     put_bits(&s->pb, 1, 0); /* extra bit picture */
 392
 393     s->frame_pred_frame_dct = 1;
 394     if(s->codec_id == AV_CODEC_ID_MPEG2VIDEO){
 395         put_header(s, EXT_START_CODE);
 396         put_bits(&s->pb, 4, 8); //pic ext
 397         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 398             put_bits(&s->pb, 4, s->f_code);
 399             put_bits(&s->pb, 4, s->f_code);
 400         }else{
 401             put_bits(&s->pb, 8, 255);
 402         }
 403         if (s->pict_type == AV_PICTURE_TYPE_B) {
 404             put_bits(&s->pb, 4, s->b_code);
 405             put_bits(&s->pb, 4, s->b_code);
 406         }else{
 407             put_bits(&s->pb, 8, 255);
 408         }
 409         put_bits(&s->pb, 2, s->intra_dc_precision);
 410
 411         av_assert0(s->picture_structure == PICT_FRAME);
 412         put_bits(&s->pb, 2, s->picture_structure);
 413         if (s->progressive_sequence) {
 414             put_bits(&s->pb, 1, 0); /* no repeat */
 415         } else {
 416             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 417         }
 418         /* XXX: optimize the generation of this flag with entropy
 419            measures */
 420         s->frame_pred_frame_dct = s->progressive_sequence;
 421
 422         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 423         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 424         put_bits(&s->pb, 1, s->q_scale_type);
 425         put_bits(&s->pb, 1, s->intra_vlc_format);
 426         put_bits(&s->pb, 1, s->alternate_scan);
 427         put_bits(&s->pb, 1, s->repeat_first_field);
 428         s->progressive_frame = s->progressive_sequence;
 429         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 430         put_bits(&s->pb, 1, s->progressive_frame);
 431         put_bits(&s->pb, 1, 0); //composite_display_flag
 432     }
 433     if (s->scan_offset) {
 434         int i;
 435
 436         put_header(s, USER_START_CODE);
 437         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 438             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 439         }
 440     }
 441
 442     s->mb_y=0;
 443     ff_mpeg1_encode_slice_header(s);
 444 }
 445
 446 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 447                                 int has_mv, int field_motion)
 448 {
 449     put_bits(&s->pb, n, bits);
 450     if (!s->frame_pred_frame_dct) {
 451         if (has_mv)
 452             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 453         put_bits(&s->pb, 1, s->interlaced_dct);
 454     }
 455 }
 456
 457 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 458                                                    DCTELEM block[6][64],
 459                                                    int motion_x, int motion_y,
 460                                                    int mb_block_count)
 461 {
 462     int i, cbp;
 463     const int mb_x = s->mb_x;
 464     const int mb_y = s->mb_y;
 465     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 466
 467     /* compute cbp */
 468     cbp = 0;
 469     for(i=0;i<mb_block_count;i++) {
 470         if (s->block_last_index[i] >= 0)
 471             cbp |= 1 << (mb_block_count - 1 - i);
 472     }
 473
 474     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 475         (mb_x != s->mb_width - 1 || (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
 476         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 477         (s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
 478         ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
 479         s->mb_skip_run++;
 480         s->qscale -= s->dquant;
 481         s->skip_count++;
 482         s->misc_bits++;
 483         s->last_bits++;
 484         if(s->pict_type == AV_PICTURE_TYPE_P){
 485             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 486             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 487         }
 488     } else {
 489         if(first_mb){
 490             av_assert0(s->mb_skip_run == 0);
 491             encode_mb_skip_run(s, s->mb_x);
 492         }else{
 493             encode_mb_skip_run(s, s->mb_skip_run);
 494         }
 495
 496         if (s->pict_type == AV_PICTURE_TYPE_I) {
 497             if(s->dquant && cbp){
 498                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 499                 put_qscale(s);
 500             }else{
 501                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 502                 s->qscale -= s->dquant;
 503             }
 504             s->misc_bits+= get_bits_diff(s);
 505             s->i_count++;
 506         } else if (s->mb_intra) {
 507             if(s->dquant && cbp){
 508                 put_mb_modes(s, 6, 0x01, 0, 0);
 509                 put_qscale(s);
 510             }else{
 511                 put_mb_modes(s, 5, 0x03, 0, 0);
 512                 s->qscale -= s->dquant;
 513             }
 514             s->misc_bits+= get_bits_diff(s);
 515             s->i_count++;
 516             memset(s->last_mv, 0, sizeof(s->last_mv));
 517         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 518             if(s->mv_type == MV_TYPE_16X16){
 519                 if (cbp != 0) {
 520                     if ((motion_x|motion_y) == 0) {
 521                         if(s->dquant){
 522                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 523                             put_qscale(s);
 524                         }else{
 525                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 526                         }
 527                         s->misc_bits+= get_bits_diff(s);
 528                     } else {
 529                         if(s->dquant){
 530                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 531                             put_qscale(s);
 532                         }else{
 533                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 534                         }
 535                         s->misc_bits+= get_bits_diff(s);
 536                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 537                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 538                         s->mv_bits+= get_bits_diff(s);
 539                     }
 540                 } else {
 541                     put_bits(&s->pb, 3, 1); /* motion only */
 542                     if (!s->frame_pred_frame_dct)
 543                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 544                     s->misc_bits+= get_bits_diff(s);
 545                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 546                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 547                     s->qscale -= s->dquant;
 548                     s->mv_bits+= get_bits_diff(s);
 549                 }
 550                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 551                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 552             }else{
 553                 av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 554
 555                 if (cbp) {
 556                     if(s->dquant){
 557                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 558                         put_qscale(s);
 559                     }else{
 560                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 561                     }
 562                 } else {
 563                     put_bits(&s->pb, 3, 1); /* motion only */
 564                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 565                     s->qscale -= s->dquant;
 566                 }
 567                 s->misc_bits+= get_bits_diff(s);
 568                 for(i=0; i<2; i++){
 569                     put_bits(&s->pb, 1, s->field_select[0][i]);
 570                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 571                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 572                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 573                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 574                 }
 575                 s->mv_bits+= get_bits_diff(s);
 576             }
 577             if(cbp) {
 578                 if (s->chroma_y_shift) {
 579                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 580                 } else {
 581                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 582                     put_sbits(&s->pb, 2, cbp);
 583                 }
 584             }
 585             s->f_count++;
 586         } else{
 587             if(s->mv_type == MV_TYPE_16X16){
 588                 if (cbp){    // With coded bloc pattern
 589                     if (s->dquant) {
 590                         if(s->mv_dir == MV_DIR_FORWARD)
 591                             put_mb_modes(s, 6, 3, 1, 0);
 592                         else
 593                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
 594                         put_qscale(s);
 595                     } else {
 596                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
 597                     }
 598                 }else{    // No coded bloc pattern
 599                     put_bits(&s->pb, 5-s->mv_dir, 2);
 600                     if (!s->frame_pred_frame_dct)
 601                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 602                     s->qscale -= s->dquant;
 603                 }
 604                 s->misc_bits += get_bits_diff(s);
 605                 if (s->mv_dir&MV_DIR_FORWARD){
 606                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 607                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 608                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 609                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 610                     s->f_count++;
 611                 }
 612                 if (s->mv_dir&MV_DIR_BACKWARD){
 613                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 614                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 615                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 616                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 617                     s->b_count++;
 618                 }
 619             }else{
 620                 av_assert2(s->mv_type == MV_TYPE_FIELD);
 621                 av_assert2(!s->frame_pred_frame_dct);
 622                 if (cbp){    // With coded bloc pattern
 623                     if (s->dquant) {
 624                         if(s->mv_dir == MV_DIR_FORWARD)
 625                             put_mb_modes(s, 6, 3, 1, 1);
 626                         else
 627                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
 628                         put_qscale(s);
 629                     } else {
 630                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
 631                     }
 632                 }else{    // No coded bloc pattern
 633                     put_bits(&s->pb, 5-s->mv_dir, 2);
 634                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 635                     s->qscale -= s->dquant;
 636                 }
 637                 s->misc_bits += get_bits_diff(s);
 638                 if (s->mv_dir&MV_DIR_FORWARD){
 639                     for(i=0; i<2; i++){
 640                         put_bits(&s->pb, 1, s->field_select[0][i]);
 641                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 642                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 643                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 644                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 645                     }
 646                     s->f_count++;
 647                 }
 648                 if (s->mv_dir&MV_DIR_BACKWARD){
 649                     for(i=0; i<2; i++){
 650                         put_bits(&s->pb, 1, s->field_select[1][i]);
 651                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 652                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 653                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 654                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 655                     }
 656                     s->b_count++;
 657                 }
 658             }
 659             s->mv_bits += get_bits_diff(s);
 660             if(cbp) {
 661                 if (s->chroma_y_shift) {
 662                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 663                 } else {
 664                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 665                     put_sbits(&s->pb, 2, cbp);
 666                 }
 667             }
 668         }
 669         for(i=0;i<mb_block_count;i++) {
 670             if (cbp & (1 << (mb_block_count - 1 - i))) {
 671                 mpeg1_encode_block(s, block[i], i);
 672             }
 673         }
 674         s->mb_skip_run = 0;
 675         if(s->mb_intra)
 676             s->i_tex_bits+= get_bits_diff(s);
 677         else
 678             s->p_tex_bits+= get_bits_diff(s);
 679     }
 680 }
 681
 682 void ff_mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
 683 {
 684     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 685     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 686 }
 687
 688 // RAL: Parameter added: f_or_b_code
 689 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 690 {
 691     if (val == 0) {
 692         /* zero vector */
 693         put_bits(&s->pb,
 694                  ff_mpeg12_mbMotionVectorTable[0][1],
 695                  ff_mpeg12_mbMotionVectorTable[0][0]);
 696     } else {
 697         int code, sign, bits;
 698         int bit_size = f_or_b_code - 1;
 699         int range = 1 << bit_size;
 700         /* modulo encoding */
 701         val = sign_extend(val, 5 + bit_size);
 702
 703         if (val >= 0) {
 704             val--;
 705             code = (val >> bit_size) + 1;
 706             bits = val & (range - 1);
 707             sign = 0;
 708         } else {
 709             val = -val;
 710             val--;
 711             code = (val >> bit_size) + 1;
 712             bits = val & (range - 1);
 713             sign = 1;
 714         }
 715
 716         av_assert2(code > 0 && code <= 16);
 717
 718         put_bits(&s->pb,
 719                  ff_mpeg12_mbMotionVectorTable[code][1],
 720                  ff_mpeg12_mbMotionVectorTable[code][0]);
 721
 722         put_bits(&s->pb, 1, sign);
 723         if (bit_size > 0) {
 724             put_bits(&s->pb, bit_size, bits);
 725         }
 726     }
 727 }
 728
 729 void ff_mpeg1_encode_init(MpegEncContext *s)
 730 {
 731     static int done=0;
 732
 733     ff_mpeg12_common_init(s);
 734
 735     if(!done){
 736         int f_code;
 737         int mv;
 738         int i;
 739
 740         done=1;
 741         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 742         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 743
 744         for(i=0; i<64; i++)
 745         {
 746                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
 747                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
 748         }
 749
 750         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 751         if(s->intra_vlc_format)
 752             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 753
 754         /* build unified dc encoding tables */
 755         for(i=-255; i<256; i++)
 756         {
 757                 int adiff, index;
 758                 int bits, code;
 759                 int diff=i;
 760
 761                 adiff = FFABS(diff);
 762                 if(diff<0) diff--;
 763                 index = av_log2(2*adiff);
 764
 765                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
 766                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 767                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 768
 769                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 770                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 771                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 772         }
 773
 774         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 775             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 776                 int len;
 777
 778                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
 779                 else{
 780                     int val, bit_size, code;
 781
 782                     bit_size = f_code - 1;
 783
 784                     val=mv;
 785                     if (val < 0)
 786                         val = -val;
 787                     val--;
 788                     code = (val >> bit_size) + 1;
 789                     if(code<17){
 790                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
 791                     }else{
 792                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
 793                     }
 794                 }
 795
 796                 mv_penalty[f_code][mv+MAX_MV]= len;
 797             }
 798         }
 799
 800
 801         for(f_code=MAX_FCODE; f_code>0; f_code--){
 802             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 803                 fcode_tab[mv+MAX_MV]= f_code;
 804             }
 805         }
 806     }
 807     s->me.mv_penalty= mv_penalty;
 808     s->fcode_tab= fcode_tab;
 809     if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO){
 810         s->min_qcoeff=-255;
 811         s->max_qcoeff= 255;
 812     }else{
 813         s->min_qcoeff=-2047;
 814         s->max_qcoeff= 2047;
 815     }
 816     if (s->intra_vlc_format) {
 817         s->intra_ac_vlc_length=
 818         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 819     } else {
 820         s->intra_ac_vlc_length=
 821         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 822     }
 823     s->inter_ac_vlc_length=
 824     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 825 }
 826
 827 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 828 {
 829   if(((unsigned) (diff+255)) >= 511){
 830         int index;
 831
 832         if(diff<0){
 833             index= av_log2_16bit(-2*diff);
 834             diff--;
 835         }else{
 836             index= av_log2_16bit(2*diff);
 837         }
 838         if (component == 0) {
 839             put_bits(
 840                 &s->pb,
 841                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
 842                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 843         }else{
 844             put_bits(
 845                 &s->pb,
 846                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 847                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 848         }
 849   }else{
 850     if (component == 0) {
 851         put_bits(
 852             &s->pb,
 853             mpeg1_lum_dc_uni[diff+255]&0xFF,
 854             mpeg1_lum_dc_uni[diff+255]>>8);
 855     } else {
 856         put_bits(
 857             &s->pb,
 858             mpeg1_chr_dc_uni[diff+255]&0xFF,
 859             mpeg1_chr_dc_uni[diff+255]>>8);
 860     }
 861   }
 862 }
 863
 864 static void mpeg1_encode_block(MpegEncContext *s,
 865                                DCTELEM *block,
 866                                int n)
 867 {
 868     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 869     int code, component;
 870     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 871
 872     last_index = s->block_last_index[n];
 873
 874     /* DC coef */
 875     if (s->mb_intra) {
 876         component = (n <= 3 ? 0 : (n&1) + 1);
 877         dc = block[0]; /* overflow is impossible */
 878         diff = dc - s->last_dc[component];
 879         encode_dc(s, diff, component);
 880         s->last_dc[component] = dc;
 881         i = 1;
 882         if (s->intra_vlc_format)
 883             table_vlc = ff_rl_mpeg2.table_vlc;
 884     } else {
 885         /* encode the first coefficient : needs to be done here because
 886            it is handled slightly differently */
 887         level = block[0];
 888         if (abs(level) == 1) {
 889                 code = ((uint32_t)level >> 31); /* the sign bit */
 890                 put_bits(&s->pb, 2, code | 0x02);
 891                 i = 1;
 892         } else {
 893             i = 0;
 894             last_non_zero = -1;
 895             goto next_coef;
 896         }
 897     }
 898
 899     /* now quantify & encode AC coefs */
 900     last_non_zero = i - 1;
 901
 902     for(;i<=last_index;i++) {
 903         j = s->intra_scantable.permutated[i];
 904         level = block[j];
 905     next_coef:
 906         /* encode using VLC */
 907         if (level != 0) {
 908             run = i - last_non_zero - 1;
 909
 910             alevel= level;
 911             MASK_ABS(sign, alevel);
 912             sign&=1;
 913
 914             if (alevel <= mpeg1_max_level[0][run]){
 915                 code= mpeg1_index_run[0][run] + alevel - 1;
 916                 /* store the vlc & sign at once */
 917                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
 918             } else {
 919                 /* escape seems to be pretty rare <5% so I do not optimize it */
 920                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 921                 /* escape: only clip in this case */
 922                 put_bits(&s->pb, 6, run);
 923                 if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO){
 924                     if (alevel < 128) {
 925                         put_sbits(&s->pb, 8, level);
 926                     } else {
 927                         if (level < 0) {
 928                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 929                         } else {
 930                             put_sbits(&s->pb, 16, level);
 931                         }
 932                     }
 933                 }else{
 934                     put_sbits(&s->pb, 12, level);
 935                 }
 936             }
 937             last_non_zero = i;
 938         }
 939     }
 940     /* end of block */
 941     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 942 }
 943
 944 #define OFFSET(x) offsetof(MpegEncContext, x)
 945 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 946 #define COMMON_OPTS\
 947     { "gop_timecode",        "MPEG GOP Timecode in hh:mm:ss[:;.]ff format", OFFSET(tc_opt_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, VE },\
 948     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },\
 949     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE}, \
 950     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 951
 952 static const AVOption mpeg1_options[] = {
 953     COMMON_OPTS
 954     FF_MPV_COMMON_OPTS
 955     { NULL },
 956 };
 957
 958 static const AVOption mpeg2_options[] = {
 959     COMMON_OPTS
 960     { "non_linear_quant",    "Use nonlinear quantizer.",          OFFSET(q_scale_type),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 961     { "alternate_scan",      "Enable alternate scantable.",       OFFSET(alternate_scan),       AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 962     FF_MPV_COMMON_OPTS
 963     { NULL },
 964 };
 965
 966 #define mpeg12_class(x)\
 967 static const AVClass mpeg## x ##_class = {\
 968     .class_name   = "mpeg" #x "video encoder",\
 969     .item_name    = av_default_item_name,\
 970     .option       = mpeg## x ##_options,\
 971     .version      = LIBAVUTIL_VERSION_INT,\
 972 };
 973
 974 mpeg12_class(1)
 975 mpeg12_class(2)
 976
 977 AVCodec ff_mpeg1video_encoder = {
 978     .name                 = "mpeg1video",
 979     .type                 = AVMEDIA_TYPE_VIDEO,
 980     .id                   = AV_CODEC_ID_MPEG1VIDEO,
 981     .priv_data_size       = sizeof(MpegEncContext),
 982     .init                 = encode_init,
 983     .encode2              = ff_MPV_encode_picture,
 984     .close                = ff_MPV_encode_end,
 985     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
 986     .pix_fmts             = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,
 987                                                         AV_PIX_FMT_NONE },
 988     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 989     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
 990     .priv_class           = &mpeg1_class,
 991 };
 992
 993 AVCodec ff_mpeg2video_encoder = {
 994     .name                 = "mpeg2video",
 995     .type                 = AVMEDIA_TYPE_VIDEO,
 996     .id                   = AV_CODEC_ID_MPEG2VIDEO,
 997     .priv_data_size       = sizeof(MpegEncContext),
 998     .init                 = encode_init,
 999     .encode2              = ff_MPV_encode_picture,
1000     .close                = ff_MPV_encode_end,
1001     .supported_framerates = ff_mpeg2_frame_rate_tab,
1002     .pix_fmts             = (const enum AVPixelFormat[]){
1003         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE
1004     },
1005     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1006     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1007     .priv_class           = &mpeg2_class,
1008 };