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   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 "mathops.h"
  30 #include "mpegvideo.h"
  31
  32 #include "mpeg12.h"
  33 #include "mpeg12data.h"
  34 #include "bytestream.h"
  35
  36 #include "libavutil/attributes.h"
  37 #include "libavutil/log.h"
  38 #include "libavutil/opt.h"
  39 #include "libavutil/avassert.h"
  40 #include "libavutil/timecode.h"
  41
  42 static const uint8_t inv_non_linear_qscale[13] = {
  43     0, 2, 4, 6, 8,
  44     9,10,11,12,13,14,15,16,
  45 };
  46
  47 static const uint8_t svcd_scan_offset_placeholder[14] = {
  48     0x10, 0x0E,
  49     0x00, 0x80, 0x81,
  50     0x00, 0x80, 0x81,
  51     0xff, 0xff, 0xff,
  52     0xff, 0xff, 0xff,
  53 };
  54
  55 static void mpeg1_encode_block(MpegEncContext *s,
  56                          int16_t *block,
  57                          int component);
  58 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
  59
  60 static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
  61 static uint8_t fcode_tab[MAX_MV*2+1];
  62
  63 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
  64 static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
  65
  66 /* simple include everything table for dc, first byte is bits number next 3 are code*/
  67 static uint32_t mpeg1_lum_dc_uni[512];
  68 static uint32_t mpeg1_chr_dc_uni[512];
  69
  70 static uint8_t mpeg1_index_run[2][64];
  71 static int8_t mpeg1_max_level[2][64];
  72
  73 static av_cold void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len)
  74 {
  75     int i;
  76
  77     for(i=0; i<128; i++){
  78         int level= i-64;
  79         int run;
  80         if (!level)
  81             continue;
  82         for(run=0; run<64; run++){
  83             int len, code;
  84
  85             int alevel= FFABS(level);
  86
  87             if (alevel > rl->max_level[0][run])
  88                 code= 111; /*rl->n*/
  89             else
  90                 code= rl->index_run[0][run] + alevel - 1;
  91
  92             if (code < 111 /* rl->n */) {
  93                 /* length of vlc and sign */
  94                 len=   rl->table_vlc[code][1]+1;
  95             } else {
  96                 len=  rl->table_vlc[111/*rl->n*/][1]+6;
  97
  98                 if (alevel < 128) {
  99                     len += 8;
 100                 } else {
 101                     len += 16;
 102                 }
 103             }
 104
 105             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
 106         }
 107     }
 108 }
 109
 110
 111 static int find_frame_rate_index(MpegEncContext *s){
 112     int i;
 113     AVRational bestq= (AVRational){0, 0};
 114     AVRational ext;
 115     AVRational target = av_inv_q(s->avctx->time_base);
 116
 117     for(i=1;i<14;i++) {
 118         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL && i>=9) break;
 119
 120         for (ext.num=1; ext.num <= 4; ext.num++) {
 121             for (ext.den=1; ext.den <= 32; ext.den++) {
 122                 AVRational q = av_mul_q(ext, ff_mpeg12_frame_rate_tab[i]);
 123
 124                 if(s->codec_id != AV_CODEC_ID_MPEG2VIDEO && (ext.den!=1 || ext.num!=1))
 125                     continue;
 126                 if(av_gcd(ext.den, ext.num) != 1)
 127                     continue;
 128
 129                 if(    bestq.num==0
 130                     || av_nearer_q(target, bestq, q) < 0
 131                     || ext.num==1 && ext.den==1 && av_nearer_q(target, bestq, q) == 0){
 132                     bestq = q;
 133                     s->frame_rate_index= i;
 134                     s->mpeg2_frame_rate_ext.num = ext.num;
 135                     s->mpeg2_frame_rate_ext.den = ext.den;
 136                 }
 137             }
 138         }
 139     }
 140     if(av_cmp_q(target, bestq))
 141         return -1;
 142     else
 143         return 0;
 144 }
 145
 146 static av_cold int encode_init(AVCodecContext *avctx)
 147 {
 148     MpegEncContext *s = avctx->priv_data;
 149
 150     if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && avctx->height > 2800)
 151         avctx->thread_count = 1;
 152
 153     if(ff_MPV_encode_init(avctx) < 0)
 154         return -1;
 155
 156     if(find_frame_rate_index(s) < 0){
 157         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
 158             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
 159             return -1;
 160         }else{
 161             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);
 162         }
 163     }
 164
 165     if(avctx->profile == FF_PROFILE_UNKNOWN){
 166         if(avctx->level != FF_LEVEL_UNKNOWN){
 167             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 168             return -1;
 169         }
 170         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
 171     }
 172
 173     if(avctx->level == FF_LEVEL_UNKNOWN){
 174         if(avctx->profile == 0){ /* 4:2:2 */
 175             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
 176             else                                            avctx->level = 2; /* High */
 177         }else{
 178             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
 179                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 180                 return -1;
 181             }
 182             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
 183             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
 184             else                                            avctx->level = 4; /* High */
 185         }
 186     }
 187
 188     if ((avctx->width & 0xFFF) == 0 && (avctx->height & 0xFFF) == 1) {
 189         av_log(avctx, AV_LOG_ERROR, "Width / Height is invalid for MPEG2\n");
 190         return AVERROR(EINVAL);
 191     }
 192
 193     if (s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
 194         if ((avctx->width & 0xFFF) == 0 || (avctx->height & 0xFFF) == 0) {
 195             av_log(avctx, AV_LOG_ERROR, "Width or Height are not allowed to be multiplies of 4096\n"
 196                                         "add '-strict %d' if you want to use them anyway.\n", FF_COMPLIANCE_UNOFFICIAL);
 197             return AVERROR(EINVAL);
 198         }
 199     }
 200
 201     s->drop_frame_timecode = s->drop_frame_timecode || !!(avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE);
 202     if (s->drop_frame_timecode)
 203         s->tc.flags |= AV_TIMECODE_FLAG_DROPFRAME;
 204     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 205         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 206         return -1;
 207     }
 208
 209     if (s->tc_opt_str) {
 210         AVRational rate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 211         int ret = av_timecode_init_from_string(&s->tc, rate, s->tc_opt_str, s);
 212         if (ret < 0)
 213             return ret;
 214         s->drop_frame_timecode = !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME);
 215         s->avctx->timecode_frame_start = s->tc.start;
 216     } else {
 217         s->avctx->timecode_frame_start = 0; // default is -1
 218     }
 219     return 0;
 220 }
 221
 222 static void put_header(MpegEncContext *s, int header)
 223 {
 224     avpriv_align_put_bits(&s->pb);
 225     put_bits(&s->pb, 16, header>>16);
 226     put_sbits(&s->pb, 16, header);
 227 }
 228
 229 /* put sequence header if needed */
 230 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 231 {
 232         unsigned int vbv_buffer_size;
 233         unsigned int fps, v;
 234         int i;
 235         uint64_t time_code;
 236         float best_aspect_error= 1E10;
 237         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 238         int constraint_parameter_flag;
 239
 240         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 241
 242         if (s->current_picture.f.key_frame) {
 243             AVRational framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 244
 245             /* mpeg1 header repeated every gop */
 246             put_header(s, SEQ_START_CODE);
 247
 248             put_sbits(&s->pb, 12, s->width  & 0xFFF);
 249             put_sbits(&s->pb, 12, s->height & 0xFFF);
 250
 251             for(i=1; i<15; i++){
 252                 float error= aspect_ratio;
 253                 if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <=1)
 254                     error-= 1.0/ff_mpeg1_aspect[i];
 255                 else
 256                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
 257
 258                 error= FFABS(error);
 259
 260                 if(error < best_aspect_error){
 261                     best_aspect_error= error;
 262                     s->aspect_ratio_info= i;
 263                 }
 264             }
 265
 266             put_bits(&s->pb, 4, s->aspect_ratio_info);
 267             put_bits(&s->pb, 4, s->frame_rate_index);
 268
 269             if(s->avctx->rc_max_rate){
 270                 v = (s->avctx->rc_max_rate + 399) / 400;
 271                 if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 272                     v = 0x3ffff;
 273             }else{
 274                 v= 0x3FFFF;
 275             }
 276
 277             if(s->avctx->rc_buffer_size)
 278                 vbv_buffer_size = s->avctx->rc_buffer_size;
 279             else
 280                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 281                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 282             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 283
 284             put_sbits(&s->pb, 18, v);
 285             put_bits(&s->pb, 1, 1); /* marker */
 286             put_sbits(&s->pb, 10, vbv_buffer_size);
 287
 288             constraint_parameter_flag=
 289                 s->width <= 768 && s->height <= 576 &&
 290                 s->mb_width * s->mb_height <= 396 &&
 291                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 292                 framerate.num <= framerate.den*30 &&
 293                 s->avctx->me_range && s->avctx->me_range < 128 &&
 294                 vbv_buffer_size <= 20 &&
 295                 v <= 1856000/400 &&
 296                 s->codec_id == AV_CODEC_ID_MPEG1VIDEO;
 297
 298             put_bits(&s->pb, 1, constraint_parameter_flag);
 299
 300             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 301             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 302
 303             if(s->codec_id == AV_CODEC_ID_MPEG2VIDEO){
 304                 put_header(s, EXT_START_CODE);
 305                 put_bits(&s->pb, 4, 1); //seq ext
 306
 307                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 308
 309                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 310                 put_bits(&s->pb, 4, s->avctx->level); //level
 311
 312                 put_bits(&s->pb, 1, s->progressive_sequence);
 313                 put_bits(&s->pb, 2, s->chroma_format);
 314                 put_bits(&s->pb, 2, s->width >>12);
 315                 put_bits(&s->pb, 2, s->height>>12);
 316                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 317                 put_bits(&s->pb, 1, 1); //marker
 318                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 319                 put_bits(&s->pb, 1, s->low_delay);
 320                 put_bits(&s->pb, 2, s->mpeg2_frame_rate_ext.num-1); // frame_rate_ext_n
 321                 put_bits(&s->pb, 5, s->mpeg2_frame_rate_ext.den-1); // frame_rate_ext_d
 322             }
 323
 324             put_header(s, GOP_START_CODE);
 325             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
 326             /* time code : we must convert from the real frame rate to a
 327                fake mpeg frame rate in case of low frame rate */
 328             fps = (framerate.num + framerate.den/2)/ framerate.den;
 329             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
 330
 331             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 332             av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));
 333             if (s->drop_frame_timecode)
 334                 time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);
 335             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 336             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 337             put_bits(&s->pb, 1, 1);
 338             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 339             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 340             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 341             put_bits(&s->pb, 1, 0); /* broken link */
 342         }
 343 }
 344
 345 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 346     while (run >= 33) {
 347         put_bits(&s->pb, 11, 0x008);
 348         run -= 33;
 349     }
 350     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 351              ff_mpeg12_mbAddrIncrTable[run][0]);
 352 }
 353
 354 static av_always_inline void put_qscale(MpegEncContext *s)
 355 {
 356     if(s->q_scale_type){
 357         av_assert2(s->qscale>=1 && s->qscale <=12);
 358         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 359     }else{
 360         put_bits(&s->pb, 5, s->qscale);
 361     }
 362 }
 363
 364 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 365     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
 366         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 367         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
 368     } else {
 369         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 370     }
 371     put_qscale(s);
 372     put_bits(&s->pb, 1, 0); /* slice extra information */
 373 }
 374
 375 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 376 {
 377     mpeg1_encode_sequence_header(s);
 378
 379     /* mpeg1 picture header */
 380     put_header(s, PICTURE_START_CODE);
 381     /* temporal reference */
 382
 383     // RAL: s->picture_number instead of s->fake_picture_number
 384     put_bits(&s->pb, 10, (s->picture_number -
 385                           s->gop_picture_number) & 0x3ff);
 386     put_bits(&s->pb, 3, s->pict_type);
 387
 388     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 389     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 390
 391     // RAL: Forward f_code also needed for B frames
 392     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 393         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 394         if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 395             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 396         else
 397             put_bits(&s->pb, 3, 7); /* forward_f_code */
 398     }
 399
 400     // RAL: Backward f_code necessary for B frames
 401     if (s->pict_type == AV_PICTURE_TYPE_B) {
 402         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 403         if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 404             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 405         else
 406             put_bits(&s->pb, 3, 7); /* backward_f_code */
 407     }
 408
 409     put_bits(&s->pb, 1, 0); /* extra bit picture */
 410
 411     s->frame_pred_frame_dct = 1;
 412     if(s->codec_id == AV_CODEC_ID_MPEG2VIDEO){
 413         put_header(s, EXT_START_CODE);
 414         put_bits(&s->pb, 4, 8); //pic ext
 415         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 416             put_bits(&s->pb, 4, s->f_code);
 417             put_bits(&s->pb, 4, s->f_code);
 418         }else{
 419             put_bits(&s->pb, 8, 255);
 420         }
 421         if (s->pict_type == AV_PICTURE_TYPE_B) {
 422             put_bits(&s->pb, 4, s->b_code);
 423             put_bits(&s->pb, 4, s->b_code);
 424         }else{
 425             put_bits(&s->pb, 8, 255);
 426         }
 427         put_bits(&s->pb, 2, s->intra_dc_precision);
 428
 429         av_assert0(s->picture_structure == PICT_FRAME);
 430         put_bits(&s->pb, 2, s->picture_structure);
 431         if (s->progressive_sequence) {
 432             put_bits(&s->pb, 1, 0); /* no repeat */
 433         } else {
 434             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 435         }
 436         /* XXX: optimize the generation of this flag with entropy
 437            measures */
 438         s->frame_pred_frame_dct = s->progressive_sequence;
 439
 440         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 441         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 442         put_bits(&s->pb, 1, s->q_scale_type);
 443         put_bits(&s->pb, 1, s->intra_vlc_format);
 444         put_bits(&s->pb, 1, s->alternate_scan);
 445         put_bits(&s->pb, 1, s->repeat_first_field);
 446         s->progressive_frame = s->progressive_sequence;
 447         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 448         put_bits(&s->pb, 1, s->progressive_frame);
 449         put_bits(&s->pb, 1, 0); //composite_display_flag
 450     }
 451     if (s->scan_offset) {
 452         int i;
 453
 454         put_header(s, USER_START_CODE);
 455         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 456             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 457         }
 458     }
 459
 460     s->mb_y=0;
 461     ff_mpeg1_encode_slice_header(s);
 462 }
 463
 464 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 465                                 int has_mv, int field_motion)
 466 {
 467     put_bits(&s->pb, n, bits);
 468     if (!s->frame_pred_frame_dct) {
 469         if (has_mv)
 470             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 471         put_bits(&s->pb, 1, s->interlaced_dct);
 472     }
 473 }
 474
 475 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 476                                                    int16_t block[6][64],
 477                                                    int motion_x, int motion_y,
 478                                                    int mb_block_count)
 479 {
 480     int i, cbp;
 481     const int mb_x = s->mb_x;
 482     const int mb_y = s->mb_y;
 483     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 484
 485     /* compute cbp */
 486     cbp = 0;
 487     for(i=0;i<mb_block_count;i++) {
 488         if (s->block_last_index[i] >= 0)
 489             cbp |= 1 << (mb_block_count - 1 - i);
 490     }
 491
 492     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 493         (mb_x != s->mb_width - 1 || (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
 494         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 495         (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) |
 496         ((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))) {
 497         s->mb_skip_run++;
 498         s->qscale -= s->dquant;
 499         s->skip_count++;
 500         s->misc_bits++;
 501         s->last_bits++;
 502         if(s->pict_type == AV_PICTURE_TYPE_P){
 503             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 504             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 505         }
 506     } else {
 507         if(first_mb){
 508             av_assert0(s->mb_skip_run == 0);
 509             encode_mb_skip_run(s, s->mb_x);
 510         }else{
 511             encode_mb_skip_run(s, s->mb_skip_run);
 512         }
 513
 514         if (s->pict_type == AV_PICTURE_TYPE_I) {
 515             if(s->dquant && cbp){
 516                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 517                 put_qscale(s);
 518             }else{
 519                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 520                 s->qscale -= s->dquant;
 521             }
 522             s->misc_bits+= get_bits_diff(s);
 523             s->i_count++;
 524         } else if (s->mb_intra) {
 525             if(s->dquant && cbp){
 526                 put_mb_modes(s, 6, 0x01, 0, 0);
 527                 put_qscale(s);
 528             }else{
 529                 put_mb_modes(s, 5, 0x03, 0, 0);
 530                 s->qscale -= s->dquant;
 531             }
 532             s->misc_bits+= get_bits_diff(s);
 533             s->i_count++;
 534             memset(s->last_mv, 0, sizeof(s->last_mv));
 535         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 536             if(s->mv_type == MV_TYPE_16X16){
 537                 if (cbp != 0) {
 538                     if ((motion_x|motion_y) == 0) {
 539                         if(s->dquant){
 540                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 541                             put_qscale(s);
 542                         }else{
 543                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 544                         }
 545                         s->misc_bits+= get_bits_diff(s);
 546                     } else {
 547                         if(s->dquant){
 548                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 549                             put_qscale(s);
 550                         }else{
 551                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 552                         }
 553                         s->misc_bits+= get_bits_diff(s);
 554                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 555                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 556                         s->mv_bits+= get_bits_diff(s);
 557                     }
 558                 } else {
 559                     put_bits(&s->pb, 3, 1); /* motion only */
 560                     if (!s->frame_pred_frame_dct)
 561                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 562                     s->misc_bits+= get_bits_diff(s);
 563                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 564                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 565                     s->qscale -= s->dquant;
 566                     s->mv_bits+= get_bits_diff(s);
 567                 }
 568                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 569                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 570             }else{
 571                 av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 572
 573                 if (cbp) {
 574                     if(s->dquant){
 575                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 576                         put_qscale(s);
 577                     }else{
 578                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 579                     }
 580                 } else {
 581                     put_bits(&s->pb, 3, 1); /* motion only */
 582                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 583                     s->qscale -= s->dquant;
 584                 }
 585                 s->misc_bits+= get_bits_diff(s);
 586                 for(i=0; i<2; i++){
 587                     put_bits(&s->pb, 1, s->field_select[0][i]);
 588                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 589                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 590                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 591                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 592                 }
 593                 s->mv_bits+= get_bits_diff(s);
 594             }
 595             if(cbp) {
 596                 if (s->chroma_y_shift) {
 597                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 598                 } else {
 599                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 600                     put_sbits(&s->pb, 2, cbp);
 601                 }
 602             }
 603             s->f_count++;
 604         } else{
 605             if(s->mv_type == MV_TYPE_16X16){
 606                 if (cbp){    // With coded bloc pattern
 607                     if (s->dquant) {
 608                         if(s->mv_dir == MV_DIR_FORWARD)
 609                             put_mb_modes(s, 6, 3, 1, 0);
 610                         else
 611                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
 612                         put_qscale(s);
 613                     } else {
 614                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
 615                     }
 616                 }else{    // No coded bloc pattern
 617                     put_bits(&s->pb, 5-s->mv_dir, 2);
 618                     if (!s->frame_pred_frame_dct)
 619                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 620                     s->qscale -= s->dquant;
 621                 }
 622                 s->misc_bits += get_bits_diff(s);
 623                 if (s->mv_dir&MV_DIR_FORWARD){
 624                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 625                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 626                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 627                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 628                     s->f_count++;
 629                 }
 630                 if (s->mv_dir&MV_DIR_BACKWARD){
 631                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 632                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 633                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 634                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 635                     s->b_count++;
 636                 }
 637             }else{
 638                 av_assert2(s->mv_type == MV_TYPE_FIELD);
 639                 av_assert2(!s->frame_pred_frame_dct);
 640                 if (cbp){    // With coded bloc pattern
 641                     if (s->dquant) {
 642                         if(s->mv_dir == MV_DIR_FORWARD)
 643                             put_mb_modes(s, 6, 3, 1, 1);
 644                         else
 645                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
 646                         put_qscale(s);
 647                     } else {
 648                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
 649                     }
 650                 }else{    // No coded bloc pattern
 651                     put_bits(&s->pb, 5-s->mv_dir, 2);
 652                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 653                     s->qscale -= s->dquant;
 654                 }
 655                 s->misc_bits += get_bits_diff(s);
 656                 if (s->mv_dir&MV_DIR_FORWARD){
 657                     for(i=0; i<2; i++){
 658                         put_bits(&s->pb, 1, s->field_select[0][i]);
 659                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 660                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 661                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 662                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 663                     }
 664                     s->f_count++;
 665                 }
 666                 if (s->mv_dir&MV_DIR_BACKWARD){
 667                     for(i=0; i<2; i++){
 668                         put_bits(&s->pb, 1, s->field_select[1][i]);
 669                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 670                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 671                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 672                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 673                     }
 674                     s->b_count++;
 675                 }
 676             }
 677             s->mv_bits += get_bits_diff(s);
 678             if(cbp) {
 679                 if (s->chroma_y_shift) {
 680                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 681                 } else {
 682                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 683                     put_sbits(&s->pb, 2, cbp);
 684                 }
 685             }
 686         }
 687         for(i=0;i<mb_block_count;i++) {
 688             if (cbp & (1 << (mb_block_count - 1 - i))) {
 689                 mpeg1_encode_block(s, block[i], i);
 690             }
 691         }
 692         s->mb_skip_run = 0;
 693         if(s->mb_intra)
 694             s->i_tex_bits+= get_bits_diff(s);
 695         else
 696             s->p_tex_bits+= get_bits_diff(s);
 697     }
 698 }
 699
 700 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[6][64], int motion_x, int motion_y)
 701 {
 702     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 703     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 704 }
 705
 706 // RAL: Parameter added: f_or_b_code
 707 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 708 {
 709     if (val == 0) {
 710         /* zero vector */
 711         put_bits(&s->pb,
 712                  ff_mpeg12_mbMotionVectorTable[0][1],
 713                  ff_mpeg12_mbMotionVectorTable[0][0]);
 714     } else {
 715         int code, sign, bits;
 716         int bit_size = f_or_b_code - 1;
 717         int range = 1 << bit_size;
 718         /* modulo encoding */
 719         val = sign_extend(val, 5 + bit_size);
 720
 721         if (val >= 0) {
 722             val--;
 723             code = (val >> bit_size) + 1;
 724             bits = val & (range - 1);
 725             sign = 0;
 726         } else {
 727             val = -val;
 728             val--;
 729             code = (val >> bit_size) + 1;
 730             bits = val & (range - 1);
 731             sign = 1;
 732         }
 733
 734         av_assert2(code > 0 && code <= 16);
 735
 736         put_bits(&s->pb,
 737                  ff_mpeg12_mbMotionVectorTable[code][1],
 738                  ff_mpeg12_mbMotionVectorTable[code][0]);
 739
 740         put_bits(&s->pb, 1, sign);
 741         if (bit_size > 0) {
 742             put_bits(&s->pb, bit_size, bits);
 743         }
 744     }
 745 }
 746
 747 av_cold void ff_mpeg1_encode_init(MpegEncContext *s)
 748 {
 749     static int done=0;
 750
 751     ff_mpeg12_common_init(s);
 752
 753     if(!done){
 754         int f_code;
 755         int mv;
 756         int i;
 757
 758         done=1;
 759         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 760         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 761
 762         for(i=0; i<64; i++)
 763         {
 764                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
 765                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
 766         }
 767
 768         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 769         if(s->intra_vlc_format)
 770             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 771
 772         /* build unified dc encoding tables */
 773         for(i=-255; i<256; i++)
 774         {
 775                 int adiff, index;
 776                 int bits, code;
 777                 int diff=i;
 778
 779                 adiff = FFABS(diff);
 780                 if(diff<0) diff--;
 781                 index = av_log2(2*adiff);
 782
 783                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
 784                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 785                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 786
 787                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 788                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 789                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 790         }
 791
 792         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 793             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 794                 int len;
 795
 796                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
 797                 else{
 798                     int val, bit_size, code;
 799
 800                     bit_size = f_code - 1;
 801
 802                     val=mv;
 803                     if (val < 0)
 804                         val = -val;
 805                     val--;
 806                     code = (val >> bit_size) + 1;
 807                     if(code<17){
 808                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
 809                     }else{
 810                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
 811                     }
 812                 }
 813
 814                 mv_penalty[f_code][mv+MAX_MV]= len;
 815             }
 816         }
 817
 818
 819         for(f_code=MAX_FCODE; f_code>0; f_code--){
 820             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 821                 fcode_tab[mv+MAX_MV]= f_code;
 822             }
 823         }
 824     }
 825     s->me.mv_penalty= mv_penalty;
 826     s->fcode_tab= fcode_tab;
 827     if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO){
 828         s->min_qcoeff=-255;
 829         s->max_qcoeff= 255;
 830     }else{
 831         s->min_qcoeff=-2047;
 832         s->max_qcoeff= 2047;
 833     }
 834     if (s->intra_vlc_format) {
 835         s->intra_ac_vlc_length=
 836         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 837     } else {
 838         s->intra_ac_vlc_length=
 839         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 840     }
 841     s->inter_ac_vlc_length=
 842     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 843 }
 844
 845 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 846 {
 847   if(((unsigned) (diff+255)) >= 511){
 848         int index;
 849
 850         if(diff<0){
 851             index= av_log2_16bit(-2*diff);
 852             diff--;
 853         }else{
 854             index= av_log2_16bit(2*diff);
 855         }
 856         if (component == 0) {
 857             put_bits(
 858                 &s->pb,
 859                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
 860                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 861         }else{
 862             put_bits(
 863                 &s->pb,
 864                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 865                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 866         }
 867   }else{
 868     if (component == 0) {
 869         put_bits(
 870             &s->pb,
 871             mpeg1_lum_dc_uni[diff+255]&0xFF,
 872             mpeg1_lum_dc_uni[diff+255]>>8);
 873     } else {
 874         put_bits(
 875             &s->pb,
 876             mpeg1_chr_dc_uni[diff+255]&0xFF,
 877             mpeg1_chr_dc_uni[diff+255]>>8);
 878     }
 879   }
 880 }
 881
 882 static void mpeg1_encode_block(MpegEncContext *s,
 883                                int16_t *block,
 884                                int n)
 885 {
 886     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 887     int code, component;
 888     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 889
 890     last_index = s->block_last_index[n];
 891
 892     /* DC coef */
 893     if (s->mb_intra) {
 894         component = (n <= 3 ? 0 : (n&1) + 1);
 895         dc = block[0]; /* overflow is impossible */
 896         diff = dc - s->last_dc[component];
 897         encode_dc(s, diff, component);
 898         s->last_dc[component] = dc;
 899         i = 1;
 900         if (s->intra_vlc_format)
 901             table_vlc = ff_rl_mpeg2.table_vlc;
 902     } else {
 903         /* encode the first coefficient : needs to be done here because
 904            it is handled slightly differently */
 905         level = block[0];
 906         if (abs(level) == 1) {
 907                 code = ((uint32_t)level >> 31); /* the sign bit */
 908                 put_bits(&s->pb, 2, code | 0x02);
 909                 i = 1;
 910         } else {
 911             i = 0;
 912             last_non_zero = -1;
 913             goto next_coef;
 914         }
 915     }
 916
 917     /* now quantify & encode AC coefs */
 918     last_non_zero = i - 1;
 919
 920     for(;i<=last_index;i++) {
 921         j = s->intra_scantable.permutated[i];
 922         level = block[j];
 923     next_coef:
 924         /* encode using VLC */
 925         if (level != 0) {
 926             run = i - last_non_zero - 1;
 927
 928             alevel= level;
 929             MASK_ABS(sign, alevel);
 930             sign&=1;
 931
 932             if (alevel <= mpeg1_max_level[0][run]){
 933                 code= mpeg1_index_run[0][run] + alevel - 1;
 934                 /* store the vlc & sign at once */
 935                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
 936             } else {
 937                 /* escape seems to be pretty rare <5% so I do not optimize it */
 938                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 939                 /* escape: only clip in this case */
 940                 put_bits(&s->pb, 6, run);
 941                 if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO){
 942                     if (alevel < 128) {
 943                         put_sbits(&s->pb, 8, level);
 944                     } else {
 945                         if (level < 0) {
 946                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 947                         } else {
 948                             put_sbits(&s->pb, 16, level);
 949                         }
 950                     }
 951                 }else{
 952                     put_sbits(&s->pb, 12, level);
 953                 }
 954             }
 955             last_non_zero = i;
 956         }
 957     }
 958     /* end of block */
 959     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 960 }
 961
 962 #define OFFSET(x) offsetof(MpegEncContext, x)
 963 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 964 #define COMMON_OPTS\
 965     { "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 },\
 966     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },\
 967     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE}, \
 968     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 969
 970 static const AVOption mpeg1_options[] = {
 971     COMMON_OPTS
 972     FF_MPV_COMMON_OPTS
 973     { NULL },
 974 };
 975
 976 static const AVOption mpeg2_options[] = {
 977     COMMON_OPTS
 978     { "non_linear_quant",    "Use nonlinear quantizer.",          OFFSET(q_scale_type),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 979     { "alternate_scan",      "Enable alternate scantable.",       OFFSET(alternate_scan),       AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 980     FF_MPV_COMMON_OPTS
 981     { NULL },
 982 };
 983
 984 #define mpeg12_class(x)\
 985 static const AVClass mpeg## x ##_class = {\
 986     .class_name   = "mpeg" #x "video encoder",\
 987     .item_name    = av_default_item_name,\
 988     .option       = mpeg## x ##_options,\
 989     .version      = LIBAVUTIL_VERSION_INT,\
 990 };
 991
 992 mpeg12_class(1)
 993 mpeg12_class(2)
 994
 995 AVCodec ff_mpeg1video_encoder = {
 996     .name                 = "mpeg1video",
 997     .type                 = AVMEDIA_TYPE_VIDEO,
 998     .id                   = AV_CODEC_ID_MPEG1VIDEO,
 999     .priv_data_size       = sizeof(MpegEncContext),
1000     .init                 = encode_init,
1001     .encode2              = ff_MPV_encode_picture,
1002     .close                = ff_MPV_encode_end,
1003     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
1004     .pix_fmts             = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,
1005                                                         AV_PIX_FMT_NONE },
1006     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1007     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
1008     .priv_class           = &mpeg1_class,
1009 };
1010
1011 AVCodec ff_mpeg2video_encoder = {
1012     .name                 = "mpeg2video",
1013     .type                 = AVMEDIA_TYPE_VIDEO,
1014     .id                   = AV_CODEC_ID_MPEG2VIDEO,
1015     .priv_data_size       = sizeof(MpegEncContext),
1016     .init                 = encode_init,
1017     .encode2              = ff_MPV_encode_picture,
1018     .close                = ff_MPV_encode_end,
1019     .supported_framerates = ff_mpeg2_frame_rate_tab,
1020     .pix_fmts             = (const enum AVPixelFormat[]){
1021         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE
1022     },
1023     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1024     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1025     .priv_class           = &mpeg2_class,
1026 };