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 (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && avctx->height > 2800)
 149         avctx->thread_count = 1;
 150
 151     if(ff_MPV_encode_init(avctx) < 0)
 152         return -1;
 153
 154     if(find_frame_rate_index(s) < 0){
 155         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
 156             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
 157             return -1;
 158         }else{
 159             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);
 160         }
 161     }
 162
 163     if(avctx->profile == FF_PROFILE_UNKNOWN){
 164         if(avctx->level != FF_LEVEL_UNKNOWN){
 165             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 166             return -1;
 167         }
 168         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
 169     }
 170
 171     if(avctx->level == FF_LEVEL_UNKNOWN){
 172         if(avctx->profile == 0){ /* 4:2:2 */
 173             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
 174             else                                            avctx->level = 2; /* High */
 175         }else{
 176             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
 177                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 178                 return -1;
 179             }
 180             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
 181             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
 182             else                                            avctx->level = 4; /* High */
 183         }
 184     }
 185
 186     if ((avctx->width & 0xFFF) == 0 && (avctx->height & 0xFFF) == 1) {
 187         av_log(avctx, AV_LOG_ERROR, "Width / Height is invalid for MPEG2\n");
 188         return AVERROR(EINVAL);
 189     }
 190
 191     if (s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
 192         if ((avctx->width & 0xFFF) == 0 || (avctx->height & 0xFFF) == 0) {
 193             av_log(avctx, AV_LOG_ERROR, "Width or Height are not allowed to be multiplies of 4096\n"
 194                                         "add '-strict %d' if you want to use them anyway.\n", FF_COMPLIANCE_UNOFFICIAL);
 195             return AVERROR(EINVAL);
 196         }
 197     }
 198
 199     s->drop_frame_timecode = s->drop_frame_timecode || !!(avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE);
 200     if (s->drop_frame_timecode)
 201         s->tc.flags |= AV_TIMECODE_FLAG_DROPFRAME;
 202     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 203         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 204         return -1;
 205     }
 206
 207     if (s->tc_opt_str) {
 208         AVRational rate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 209         int ret = av_timecode_init_from_string(&s->tc, rate, s->tc_opt_str, s);
 210         if (ret < 0)
 211             return ret;
 212         s->drop_frame_timecode = !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME);
 213         s->avctx->timecode_frame_start = s->tc.start;
 214     } else {
 215         s->avctx->timecode_frame_start = 0; // default is -1
 216     }
 217     return 0;
 218 }
 219
 220 static void put_header(MpegEncContext *s, int header)
 221 {
 222     avpriv_align_put_bits(&s->pb);
 223     put_bits(&s->pb, 16, header>>16);
 224     put_sbits(&s->pb, 16, header);
 225 }
 226
 227 /* put sequence header if needed */
 228 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 229 {
 230         unsigned int vbv_buffer_size;
 231         unsigned int fps, v;
 232         int i;
 233         uint64_t time_code;
 234         float best_aspect_error= 1E10;
 235         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 236         int constraint_parameter_flag;
 237
 238         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 239
 240         if (s->current_picture.f.key_frame) {
 241             AVRational framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 242
 243             /* mpeg1 header repeated every gop */
 244             put_header(s, SEQ_START_CODE);
 245
 246             put_sbits(&s->pb, 12, s->width  & 0xFFF);
 247             put_sbits(&s->pb, 12, s->height & 0xFFF);
 248
 249             for(i=1; i<15; i++){
 250                 float error= aspect_ratio;
 251                 if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <=1)
 252                     error-= 1.0/ff_mpeg1_aspect[i];
 253                 else
 254                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
 255
 256                 error= FFABS(error);
 257
 258                 if(error < best_aspect_error){
 259                     best_aspect_error= error;
 260                     s->aspect_ratio_info= i;
 261                 }
 262             }
 263
 264             put_bits(&s->pb, 4, s->aspect_ratio_info);
 265             put_bits(&s->pb, 4, s->frame_rate_index);
 266
 267             if(s->avctx->rc_max_rate){
 268                 v = (s->avctx->rc_max_rate + 399) / 400;
 269                 if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 270                     v = 0x3ffff;
 271             }else{
 272                 v= 0x3FFFF;
 273             }
 274
 275             if(s->avctx->rc_buffer_size)
 276                 vbv_buffer_size = s->avctx->rc_buffer_size;
 277             else
 278                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 279                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 280             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 281
 282             put_sbits(&s->pb, 18, v);
 283             put_bits(&s->pb, 1, 1); /* marker */
 284             put_sbits(&s->pb, 10, vbv_buffer_size);
 285
 286             constraint_parameter_flag=
 287                 s->width <= 768 && s->height <= 576 &&
 288                 s->mb_width * s->mb_height <= 396 &&
 289                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 290                 framerate.num <= framerate.den*30 &&
 291                 s->avctx->me_range && s->avctx->me_range < 128 &&
 292                 vbv_buffer_size <= 20 &&
 293                 v <= 1856000/400 &&
 294                 s->codec_id == AV_CODEC_ID_MPEG1VIDEO;
 295
 296             put_bits(&s->pb, 1, constraint_parameter_flag);
 297
 298             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 299             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 300
 301             if(s->codec_id == AV_CODEC_ID_MPEG2VIDEO){
 302                 put_header(s, EXT_START_CODE);
 303                 put_bits(&s->pb, 4, 1); //seq ext
 304
 305                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 306
 307                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 308                 put_bits(&s->pb, 4, s->avctx->level); //level
 309
 310                 put_bits(&s->pb, 1, s->progressive_sequence);
 311                 put_bits(&s->pb, 2, s->chroma_format);
 312                 put_bits(&s->pb, 2, s->width >>12);
 313                 put_bits(&s->pb, 2, s->height>>12);
 314                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 315                 put_bits(&s->pb, 1, 1); //marker
 316                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 317                 put_bits(&s->pb, 1, s->low_delay);
 318                 put_bits(&s->pb, 2, s->mpeg2_frame_rate_ext.num-1); // frame_rate_ext_n
 319                 put_bits(&s->pb, 5, s->mpeg2_frame_rate_ext.den-1); // frame_rate_ext_d
 320             }
 321
 322             put_header(s, GOP_START_CODE);
 323             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
 324             /* time code : we must convert from the real frame rate to a
 325                fake mpeg frame rate in case of low frame rate */
 326             fps = (framerate.num + framerate.den/2)/ framerate.den;
 327             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
 328
 329             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 330             av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));
 331             if (s->drop_frame_timecode)
 332                 time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);
 333             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 334             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 335             put_bits(&s->pb, 1, 1);
 336             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 337             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 338             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 339             put_bits(&s->pb, 1, 0); /* broken link */
 340         }
 341 }
 342
 343 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 344     while (run >= 33) {
 345         put_bits(&s->pb, 11, 0x008);
 346         run -= 33;
 347     }
 348     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 349              ff_mpeg12_mbAddrIncrTable[run][0]);
 350 }
 351
 352 static av_always_inline void put_qscale(MpegEncContext *s)
 353 {
 354     if(s->q_scale_type){
 355         av_assert2(s->qscale>=1 && s->qscale <=12);
 356         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 357     }else{
 358         put_bits(&s->pb, 5, s->qscale);
 359     }
 360 }
 361
 362 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 363     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
 364         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 365         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
 366     } else {
 367         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 368     }
 369     put_qscale(s);
 370     put_bits(&s->pb, 1, 0); /* slice extra information */
 371 }
 372
 373 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 374 {
 375     mpeg1_encode_sequence_header(s);
 376
 377     /* mpeg1 picture header */
 378     put_header(s, PICTURE_START_CODE);
 379     /* temporal reference */
 380
 381     // RAL: s->picture_number instead of s->fake_picture_number
 382     put_bits(&s->pb, 10, (s->picture_number -
 383                           s->gop_picture_number) & 0x3ff);
 384     put_bits(&s->pb, 3, s->pict_type);
 385
 386     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 387     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 388
 389     // RAL: Forward f_code also needed for B frames
 390     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 391         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 392         if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 393             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 394         else
 395             put_bits(&s->pb, 3, 7); /* forward_f_code */
 396     }
 397
 398     // RAL: Backward f_code necessary for B frames
 399     if (s->pict_type == AV_PICTURE_TYPE_B) {
 400         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 401         if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 402             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 403         else
 404             put_bits(&s->pb, 3, 7); /* backward_f_code */
 405     }
 406
 407     put_bits(&s->pb, 1, 0); /* extra bit picture */
 408
 409     s->frame_pred_frame_dct = 1;
 410     if(s->codec_id == AV_CODEC_ID_MPEG2VIDEO){
 411         put_header(s, EXT_START_CODE);
 412         put_bits(&s->pb, 4, 8); //pic ext
 413         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 414             put_bits(&s->pb, 4, s->f_code);
 415             put_bits(&s->pb, 4, s->f_code);
 416         }else{
 417             put_bits(&s->pb, 8, 255);
 418         }
 419         if (s->pict_type == AV_PICTURE_TYPE_B) {
 420             put_bits(&s->pb, 4, s->b_code);
 421             put_bits(&s->pb, 4, s->b_code);
 422         }else{
 423             put_bits(&s->pb, 8, 255);
 424         }
 425         put_bits(&s->pb, 2, s->intra_dc_precision);
 426
 427         av_assert0(s->picture_structure == PICT_FRAME);
 428         put_bits(&s->pb, 2, s->picture_structure);
 429         if (s->progressive_sequence) {
 430             put_bits(&s->pb, 1, 0); /* no repeat */
 431         } else {
 432             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 433         }
 434         /* XXX: optimize the generation of this flag with entropy
 435            measures */
 436         s->frame_pred_frame_dct = s->progressive_sequence;
 437
 438         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 439         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 440         put_bits(&s->pb, 1, s->q_scale_type);
 441         put_bits(&s->pb, 1, s->intra_vlc_format);
 442         put_bits(&s->pb, 1, s->alternate_scan);
 443         put_bits(&s->pb, 1, s->repeat_first_field);
 444         s->progressive_frame = s->progressive_sequence;
 445         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 446         put_bits(&s->pb, 1, s->progressive_frame);
 447         put_bits(&s->pb, 1, 0); //composite_display_flag
 448     }
 449     if (s->scan_offset) {
 450         int i;
 451
 452         put_header(s, USER_START_CODE);
 453         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 454             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 455         }
 456     }
 457
 458     s->mb_y=0;
 459     ff_mpeg1_encode_slice_header(s);
 460 }
 461
 462 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 463                                 int has_mv, int field_motion)
 464 {
 465     put_bits(&s->pb, n, bits);
 466     if (!s->frame_pred_frame_dct) {
 467         if (has_mv)
 468             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 469         put_bits(&s->pb, 1, s->interlaced_dct);
 470     }
 471 }
 472
 473 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 474                                                    DCTELEM block[6][64],
 475                                                    int motion_x, int motion_y,
 476                                                    int mb_block_count)
 477 {
 478     int i, cbp;
 479     const int mb_x = s->mb_x;
 480     const int mb_y = s->mb_y;
 481     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 482
 483     /* compute cbp */
 484     cbp = 0;
 485     for(i=0;i<mb_block_count;i++) {
 486         if (s->block_last_index[i] >= 0)
 487             cbp |= 1 << (mb_block_count - 1 - i);
 488     }
 489
 490     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 491         (mb_x != s->mb_width - 1 || (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
 492         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 493         (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) |
 494         ((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))) {
 495         s->mb_skip_run++;
 496         s->qscale -= s->dquant;
 497         s->skip_count++;
 498         s->misc_bits++;
 499         s->last_bits++;
 500         if(s->pict_type == AV_PICTURE_TYPE_P){
 501             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 502             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 503         }
 504     } else {
 505         if(first_mb){
 506             av_assert0(s->mb_skip_run == 0);
 507             encode_mb_skip_run(s, s->mb_x);
 508         }else{
 509             encode_mb_skip_run(s, s->mb_skip_run);
 510         }
 511
 512         if (s->pict_type == AV_PICTURE_TYPE_I) {
 513             if(s->dquant && cbp){
 514                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 515                 put_qscale(s);
 516             }else{
 517                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 518                 s->qscale -= s->dquant;
 519             }
 520             s->misc_bits+= get_bits_diff(s);
 521             s->i_count++;
 522         } else if (s->mb_intra) {
 523             if(s->dquant && cbp){
 524                 put_mb_modes(s, 6, 0x01, 0, 0);
 525                 put_qscale(s);
 526             }else{
 527                 put_mb_modes(s, 5, 0x03, 0, 0);
 528                 s->qscale -= s->dquant;
 529             }
 530             s->misc_bits+= get_bits_diff(s);
 531             s->i_count++;
 532             memset(s->last_mv, 0, sizeof(s->last_mv));
 533         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 534             if(s->mv_type == MV_TYPE_16X16){
 535                 if (cbp != 0) {
 536                     if ((motion_x|motion_y) == 0) {
 537                         if(s->dquant){
 538                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 539                             put_qscale(s);
 540                         }else{
 541                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 542                         }
 543                         s->misc_bits+= get_bits_diff(s);
 544                     } else {
 545                         if(s->dquant){
 546                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 547                             put_qscale(s);
 548                         }else{
 549                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 550                         }
 551                         s->misc_bits+= get_bits_diff(s);
 552                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 553                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 554                         s->mv_bits+= get_bits_diff(s);
 555                     }
 556                 } else {
 557                     put_bits(&s->pb, 3, 1); /* motion only */
 558                     if (!s->frame_pred_frame_dct)
 559                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 560                     s->misc_bits+= get_bits_diff(s);
 561                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 562                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 563                     s->qscale -= s->dquant;
 564                     s->mv_bits+= get_bits_diff(s);
 565                 }
 566                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 567                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 568             }else{
 569                 av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 570
 571                 if (cbp) {
 572                     if(s->dquant){
 573                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 574                         put_qscale(s);
 575                     }else{
 576                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 577                     }
 578                 } else {
 579                     put_bits(&s->pb, 3, 1); /* motion only */
 580                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 581                     s->qscale -= s->dquant;
 582                 }
 583                 s->misc_bits+= get_bits_diff(s);
 584                 for(i=0; i<2; i++){
 585                     put_bits(&s->pb, 1, s->field_select[0][i]);
 586                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 587                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 588                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 589                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 590                 }
 591                 s->mv_bits+= get_bits_diff(s);
 592             }
 593             if(cbp) {
 594                 if (s->chroma_y_shift) {
 595                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 596                 } else {
 597                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 598                     put_sbits(&s->pb, 2, cbp);
 599                 }
 600             }
 601             s->f_count++;
 602         } else{
 603             if(s->mv_type == MV_TYPE_16X16){
 604                 if (cbp){    // With coded bloc pattern
 605                     if (s->dquant) {
 606                         if(s->mv_dir == MV_DIR_FORWARD)
 607                             put_mb_modes(s, 6, 3, 1, 0);
 608                         else
 609                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
 610                         put_qscale(s);
 611                     } else {
 612                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
 613                     }
 614                 }else{    // No coded bloc pattern
 615                     put_bits(&s->pb, 5-s->mv_dir, 2);
 616                     if (!s->frame_pred_frame_dct)
 617                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 618                     s->qscale -= s->dquant;
 619                 }
 620                 s->misc_bits += get_bits_diff(s);
 621                 if (s->mv_dir&MV_DIR_FORWARD){
 622                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 623                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 624                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 625                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 626                     s->f_count++;
 627                 }
 628                 if (s->mv_dir&MV_DIR_BACKWARD){
 629                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 630                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 631                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 632                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 633                     s->b_count++;
 634                 }
 635             }else{
 636                 av_assert2(s->mv_type == MV_TYPE_FIELD);
 637                 av_assert2(!s->frame_pred_frame_dct);
 638                 if (cbp){    // With coded bloc pattern
 639                     if (s->dquant) {
 640                         if(s->mv_dir == MV_DIR_FORWARD)
 641                             put_mb_modes(s, 6, 3, 1, 1);
 642                         else
 643                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
 644                         put_qscale(s);
 645                     } else {
 646                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
 647                     }
 648                 }else{    // No coded bloc pattern
 649                     put_bits(&s->pb, 5-s->mv_dir, 2);
 650                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 651                     s->qscale -= s->dquant;
 652                 }
 653                 s->misc_bits += get_bits_diff(s);
 654                 if (s->mv_dir&MV_DIR_FORWARD){
 655                     for(i=0; i<2; i++){
 656                         put_bits(&s->pb, 1, s->field_select[0][i]);
 657                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 658                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 659                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 660                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 661                     }
 662                     s->f_count++;
 663                 }
 664                 if (s->mv_dir&MV_DIR_BACKWARD){
 665                     for(i=0; i<2; i++){
 666                         put_bits(&s->pb, 1, s->field_select[1][i]);
 667                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 668                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 669                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 670                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 671                     }
 672                     s->b_count++;
 673                 }
 674             }
 675             s->mv_bits += get_bits_diff(s);
 676             if(cbp) {
 677                 if (s->chroma_y_shift) {
 678                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 679                 } else {
 680                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 681                     put_sbits(&s->pb, 2, cbp);
 682                 }
 683             }
 684         }
 685         for(i=0;i<mb_block_count;i++) {
 686             if (cbp & (1 << (mb_block_count - 1 - i))) {
 687                 mpeg1_encode_block(s, block[i], i);
 688             }
 689         }
 690         s->mb_skip_run = 0;
 691         if(s->mb_intra)
 692             s->i_tex_bits+= get_bits_diff(s);
 693         else
 694             s->p_tex_bits+= get_bits_diff(s);
 695     }
 696 }
 697
 698 void ff_mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
 699 {
 700     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 701     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 702 }
 703
 704 // RAL: Parameter added: f_or_b_code
 705 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 706 {
 707     if (val == 0) {
 708         /* zero vector */
 709         put_bits(&s->pb,
 710                  ff_mpeg12_mbMotionVectorTable[0][1],
 711                  ff_mpeg12_mbMotionVectorTable[0][0]);
 712     } else {
 713         int code, sign, bits;
 714         int bit_size = f_or_b_code - 1;
 715         int range = 1 << bit_size;
 716         /* modulo encoding */
 717         val = sign_extend(val, 5 + bit_size);
 718
 719         if (val >= 0) {
 720             val--;
 721             code = (val >> bit_size) + 1;
 722             bits = val & (range - 1);
 723             sign = 0;
 724         } else {
 725             val = -val;
 726             val--;
 727             code = (val >> bit_size) + 1;
 728             bits = val & (range - 1);
 729             sign = 1;
 730         }
 731
 732         av_assert2(code > 0 && code <= 16);
 733
 734         put_bits(&s->pb,
 735                  ff_mpeg12_mbMotionVectorTable[code][1],
 736                  ff_mpeg12_mbMotionVectorTable[code][0]);
 737
 738         put_bits(&s->pb, 1, sign);
 739         if (bit_size > 0) {
 740             put_bits(&s->pb, bit_size, bits);
 741         }
 742     }
 743 }
 744
 745 void ff_mpeg1_encode_init(MpegEncContext *s)
 746 {
 747     static int done=0;
 748
 749     ff_mpeg12_common_init(s);
 750
 751     if(!done){
 752         int f_code;
 753         int mv;
 754         int i;
 755
 756         done=1;
 757         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 758         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 759
 760         for(i=0; i<64; i++)
 761         {
 762                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
 763                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
 764         }
 765
 766         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 767         if(s->intra_vlc_format)
 768             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 769
 770         /* build unified dc encoding tables */
 771         for(i=-255; i<256; i++)
 772         {
 773                 int adiff, index;
 774                 int bits, code;
 775                 int diff=i;
 776
 777                 adiff = FFABS(diff);
 778                 if(diff<0) diff--;
 779                 index = av_log2(2*adiff);
 780
 781                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
 782                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 783                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 784
 785                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 786                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 787                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 788         }
 789
 790         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 791             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 792                 int len;
 793
 794                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
 795                 else{
 796                     int val, bit_size, code;
 797
 798                     bit_size = f_code - 1;
 799
 800                     val=mv;
 801                     if (val < 0)
 802                         val = -val;
 803                     val--;
 804                     code = (val >> bit_size) + 1;
 805                     if(code<17){
 806                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
 807                     }else{
 808                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
 809                     }
 810                 }
 811
 812                 mv_penalty[f_code][mv+MAX_MV]= len;
 813             }
 814         }
 815
 816
 817         for(f_code=MAX_FCODE; f_code>0; f_code--){
 818             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 819                 fcode_tab[mv+MAX_MV]= f_code;
 820             }
 821         }
 822     }
 823     s->me.mv_penalty= mv_penalty;
 824     s->fcode_tab= fcode_tab;
 825     if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO){
 826         s->min_qcoeff=-255;
 827         s->max_qcoeff= 255;
 828     }else{
 829         s->min_qcoeff=-2047;
 830         s->max_qcoeff= 2047;
 831     }
 832     if (s->intra_vlc_format) {
 833         s->intra_ac_vlc_length=
 834         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 835     } else {
 836         s->intra_ac_vlc_length=
 837         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 838     }
 839     s->inter_ac_vlc_length=
 840     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 841 }
 842
 843 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 844 {
 845   if(((unsigned) (diff+255)) >= 511){
 846         int index;
 847
 848         if(diff<0){
 849             index= av_log2_16bit(-2*diff);
 850             diff--;
 851         }else{
 852             index= av_log2_16bit(2*diff);
 853         }
 854         if (component == 0) {
 855             put_bits(
 856                 &s->pb,
 857                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
 858                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 859         }else{
 860             put_bits(
 861                 &s->pb,
 862                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 863                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 864         }
 865   }else{
 866     if (component == 0) {
 867         put_bits(
 868             &s->pb,
 869             mpeg1_lum_dc_uni[diff+255]&0xFF,
 870             mpeg1_lum_dc_uni[diff+255]>>8);
 871     } else {
 872         put_bits(
 873             &s->pb,
 874             mpeg1_chr_dc_uni[diff+255]&0xFF,
 875             mpeg1_chr_dc_uni[diff+255]>>8);
 876     }
 877   }
 878 }
 879
 880 static void mpeg1_encode_block(MpegEncContext *s,
 881                                DCTELEM *block,
 882                                int n)
 883 {
 884     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 885     int code, component;
 886     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 887
 888     last_index = s->block_last_index[n];
 889
 890     /* DC coef */
 891     if (s->mb_intra) {
 892         component = (n <= 3 ? 0 : (n&1) + 1);
 893         dc = block[0]; /* overflow is impossible */
 894         diff = dc - s->last_dc[component];
 895         encode_dc(s, diff, component);
 896         s->last_dc[component] = dc;
 897         i = 1;
 898         if (s->intra_vlc_format)
 899             table_vlc = ff_rl_mpeg2.table_vlc;
 900     } else {
 901         /* encode the first coefficient : needs to be done here because
 902            it is handled slightly differently */
 903         level = block[0];
 904         if (abs(level) == 1) {
 905                 code = ((uint32_t)level >> 31); /* the sign bit */
 906                 put_bits(&s->pb, 2, code | 0x02);
 907                 i = 1;
 908         } else {
 909             i = 0;
 910             last_non_zero = -1;
 911             goto next_coef;
 912         }
 913     }
 914
 915     /* now quantify & encode AC coefs */
 916     last_non_zero = i - 1;
 917
 918     for(;i<=last_index;i++) {
 919         j = s->intra_scantable.permutated[i];
 920         level = block[j];
 921     next_coef:
 922         /* encode using VLC */
 923         if (level != 0) {
 924             run = i - last_non_zero - 1;
 925
 926             alevel= level;
 927             MASK_ABS(sign, alevel);
 928             sign&=1;
 929
 930             if (alevel <= mpeg1_max_level[0][run]){
 931                 code= mpeg1_index_run[0][run] + alevel - 1;
 932                 /* store the vlc & sign at once */
 933                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
 934             } else {
 935                 /* escape seems to be pretty rare <5% so I do not optimize it */
 936                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 937                 /* escape: only clip in this case */
 938                 put_bits(&s->pb, 6, run);
 939                 if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO){
 940                     if (alevel < 128) {
 941                         put_sbits(&s->pb, 8, level);
 942                     } else {
 943                         if (level < 0) {
 944                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 945                         } else {
 946                             put_sbits(&s->pb, 16, level);
 947                         }
 948                     }
 949                 }else{
 950                     put_sbits(&s->pb, 12, level);
 951                 }
 952             }
 953             last_non_zero = i;
 954         }
 955     }
 956     /* end of block */
 957     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 958 }
 959
 960 #define OFFSET(x) offsetof(MpegEncContext, x)
 961 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 962 #define COMMON_OPTS\
 963     { "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 },\
 964     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },\
 965     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE}, \
 966     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 967
 968 static const AVOption mpeg1_options[] = {
 969     COMMON_OPTS
 970     FF_MPV_COMMON_OPTS
 971     { NULL },
 972 };
 973
 974 static const AVOption mpeg2_options[] = {
 975     COMMON_OPTS
 976     { "non_linear_quant",    "Use nonlinear quantizer.",          OFFSET(q_scale_type),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 977     { "alternate_scan",      "Enable alternate scantable.",       OFFSET(alternate_scan),       AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 978     FF_MPV_COMMON_OPTS
 979     { NULL },
 980 };
 981
 982 #define mpeg12_class(x)\
 983 static const AVClass mpeg## x ##_class = {\
 984     .class_name   = "mpeg" #x "video encoder",\
 985     .item_name    = av_default_item_name,\
 986     .option       = mpeg## x ##_options,\
 987     .version      = LIBAVUTIL_VERSION_INT,\
 988 };
 989
 990 mpeg12_class(1)
 991 mpeg12_class(2)
 992
 993 AVCodec ff_mpeg1video_encoder = {
 994     .name                 = "mpeg1video",
 995     .type                 = AVMEDIA_TYPE_VIDEO,
 996     .id                   = AV_CODEC_ID_MPEG1VIDEO,
 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_mpeg12_frame_rate_tab + 1,
1002     .pix_fmts             = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,
1003                                                         AV_PIX_FMT_NONE },
1004     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1005     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
1006     .priv_class           = &mpeg1_class,
1007 };
1008
1009 AVCodec ff_mpeg2video_encoder = {
1010     .name                 = "mpeg2video",
1011     .type                 = AVMEDIA_TYPE_VIDEO,
1012     .id                   = AV_CODEC_ID_MPEG2VIDEO,
1013     .priv_data_size       = sizeof(MpegEncContext),
1014     .init                 = encode_init,
1015     .encode2              = ff_MPV_encode_picture,
1016     .close                = ff_MPV_encode_end,
1017     .supported_framerates = ff_mpeg2_frame_rate_tab,
1018     .pix_fmts             = (const enum AVPixelFormat[]){
1019         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE
1020     },
1021     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1022     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1023     .priv_class           = &mpeg2_class,
1024 };