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