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

   1 /*
   2  * MPEG1/2 encoder
   3  * Copyright (c) 2000,2001 Fabrice Bellard
   4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file
  25  * MPEG1/2 encoder
  26  */
  27
  28 #include "avcodec.h"
  29 #include "dsputil.h"
  30 #include "mathops.h"
  31 #include "mpegvideo.h"
  32
  33 #include "mpeg12.h"
  34 #include "mpeg12data.h"
  35 #include "bytestream.h"
  36 #include "libavutil/log.h"
  37 #include "libavutil/opt.h"
  38 #include "libavutil/avassert.h"
  39 #include "libavutil/timecode.h"
  40
  41 static const uint8_t inv_non_linear_qscale[13] = {
  42     0, 2, 4, 6, 8,
  43     9,10,11,12,13,14,15,16,
  44 };
  45
  46 static const uint8_t svcd_scan_offset_placeholder[14] = {
  47     0x10, 0x0E,
  48     0x00, 0x80, 0x81,
  49     0x00, 0x80, 0x81,
  50     0xff, 0xff, 0xff,
  51     0xff, 0xff, 0xff,
  52 };
  53
  54 static void mpeg1_encode_block(MpegEncContext *s,
  55                          DCTELEM *block,
  56                          int component);
  57 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
  58
  59 static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
  60 static uint8_t fcode_tab[MAX_MV*2+1];
  61
  62 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
  63 static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
  64
  65 /* simple include everything table for dc, first byte is bits number next 3 are code*/
  66 static uint32_t mpeg1_lum_dc_uni[512];
  67 static uint32_t mpeg1_chr_dc_uni[512];
  68
  69 static uint8_t mpeg1_index_run[2][64];
  70 static int8_t mpeg1_max_level[2][64];
  71
  72 static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
  73     int i;
  74
  75     for(i=0; i<128; i++){
  76         int level= i-64;
  77         int run;
  78         if (!level)
  79             continue;
  80         for(run=0; run<64; run++){
  81             int len, code;
  82
  83             int alevel= FFABS(level);
  84
  85             if (alevel > rl->max_level[0][run])
  86                 code= 111; /*rl->n*/
  87             else
  88                 code= rl->index_run[0][run] + alevel - 1;
  89
  90             if (code < 111 /* rl->n */) {
  91                 /* length of vlc and sign */
  92                 len=   rl->table_vlc[code][1]+1;
  93             } else {
  94                 len=  rl->table_vlc[111/*rl->n*/][1]+6;
  95
  96                 if (alevel < 128) {
  97                     len += 8;
  98                 } else {
  99                     len += 16;
 100                 }
 101             }
 102
 103             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
 104         }
 105     }
 106 }
 107
 108
 109 static int find_frame_rate_index(MpegEncContext *s){
 110     int i;
 111     AVRational bestq= (AVRational){0, 0};
 112     AVRational ext;
 113     AVRational target = av_inv_q(s->avctx->time_base);
 114
 115     for(i=1;i<14;i++) {
 116         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL && i>=9) break;
 117
 118         for (ext.num=1; ext.num <= 4; ext.num++) {
 119             for (ext.den=1; ext.den <= 32; ext.den++) {
 120                 AVRational q = av_mul_q(ext, ff_mpeg12_frame_rate_tab[i]);
 121
 122                 if(s->codec_id != AV_CODEC_ID_MPEG2VIDEO && (ext.den!=1 || ext.num!=1))
 123                     continue;
 124                 if(av_gcd(ext.den, ext.num) != 1)
 125                     continue;
 126
 127                 if(    bestq.num==0
 128                     || av_nearer_q(target, bestq, q) < 0
 129                     || ext.num==1 && ext.den==1 && av_nearer_q(target, bestq, q) == 0){
 130                     bestq = q;
 131                     s->frame_rate_index= i;
 132                     s->mpeg2_frame_rate_ext.num = ext.num;
 133                     s->mpeg2_frame_rate_ext.den = ext.den;
 134                 }
 135             }
 136         }
 137     }
 138     if(av_cmp_q(target, bestq))
 139         return -1;
 140     else
 141         return 0;
 142 }
 143
 144 static av_cold int encode_init(AVCodecContext *avctx)
 145 {
 146     MpegEncContext *s = avctx->priv_data;
 147
 148     if(ff_MPV_encode_init(avctx) < 0)
 149         return -1;
 150
 151     if(find_frame_rate_index(s) < 0){
 152         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
 153             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
 154             return -1;
 155         }else{
 156             av_log(avctx, AV_LOG_INFO, "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n", avctx->time_base.den, avctx->time_base.num);
 157         }
 158     }
 159
 160     if(avctx->profile == FF_PROFILE_UNKNOWN){
 161         if(avctx->level != FF_LEVEL_UNKNOWN){
 162             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 163             return -1;
 164         }
 165         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
 166     }
 167
 168     if(avctx->level == FF_LEVEL_UNKNOWN){
 169         if(avctx->profile == 0){ /* 4:2:2 */
 170             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
 171             else                                            avctx->level = 2; /* High */
 172         }else{
 173             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
 174                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 175                 return -1;
 176             }
 177             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
 178             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
 179             else                                            avctx->level = 4; /* High */
 180         }
 181     }
 182
 183     if ((avctx->width & 0xFFF) == 0 && (avctx->height & 0xFFF) == 1) {
 184         av_log(avctx, AV_LOG_ERROR, "Width / Height is invalid for MPEG2\n");
 185         return AVERROR(EINVAL);
 186     }
 187
 188     if (s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
 189         if ((avctx->width & 0xFFF) == 0 || (avctx->height & 0xFFF) == 0) {
 190             av_log(avctx, AV_LOG_ERROR, "Width or Height are not allowed to be multiplies of 4096\n"
 191                                         "add '-strict %d' if you want to use them anyway.\n", FF_COMPLIANCE_UNOFFICIAL);
 192             return AVERROR(EINVAL);
 193         }
 194     }
 195
 196     s->drop_frame_timecode = s->drop_frame_timecode || !!(avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE);
 197     if (s->drop_frame_timecode)
 198         s->tc.flags |= AV_TIMECODE_FLAG_DROPFRAME;
 199     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 200         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 201         return -1;
 202     }
 203
 204     if (s->tc_opt_str) {
 205         AVRational rate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 206         int ret = av_timecode_init_from_string(&s->tc, rate, s->tc_opt_str, s);
 207         if (ret < 0)
 208             return ret;
 209         s->drop_frame_timecode = !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME);
 210         s->avctx->timecode_frame_start = s->tc.start;
 211     } else {
 212         s->avctx->timecode_frame_start = 0; // default is -1
 213     }
 214     return 0;
 215 }
 216
 217 static void put_header(MpegEncContext *s, int header)
 218 {
 219     avpriv_align_put_bits(&s->pb);
 220     put_bits(&s->pb, 16, header>>16);
 221     put_sbits(&s->pb, 16, header);
 222 }
 223
 224 /* put sequence header if needed */
 225 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 226 {
 227         unsigned int vbv_buffer_size;
 228         unsigned int fps, v;
 229         int i;
 230         uint64_t time_code;
 231         float best_aspect_error= 1E10;
 232         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 233         int constraint_parameter_flag;
 234
 235         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 236
 237         if (s->current_picture.f.key_frame) {
 238             AVRational framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
 239
 240             /* mpeg1 header repeated every gop */
 241             put_header(s, SEQ_START_CODE);
 242
 243             put_sbits(&s->pb, 12, s->width  & 0xFFF);
 244             put_sbits(&s->pb, 12, s->height & 0xFFF);
 245
 246             for(i=1; i<15; i++){
 247                 float error= aspect_ratio;
 248                 if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <=1)
 249                     error-= 1.0/ff_mpeg1_aspect[i];
 250                 else
 251                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
 252
 253                 error= FFABS(error);
 254
 255                 if(error < best_aspect_error){
 256                     best_aspect_error= error;
 257                     s->aspect_ratio_info= i;
 258                 }
 259             }
 260
 261             put_bits(&s->pb, 4, s->aspect_ratio_info);
 262             put_bits(&s->pb, 4, s->frame_rate_index);
 263
 264             if(s->avctx->rc_max_rate){
 265                 v = (s->avctx->rc_max_rate + 399) / 400;
 266                 if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 267                     v = 0x3ffff;
 268             }else{
 269                 v= 0x3FFFF;
 270             }
 271
 272             if(s->avctx->rc_buffer_size)
 273                 vbv_buffer_size = s->avctx->rc_buffer_size;
 274             else
 275                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 276                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 277             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 278
 279             put_sbits(&s->pb, 18, v);
 280             put_bits(&s->pb, 1, 1); /* marker */
 281             put_sbits(&s->pb, 10, vbv_buffer_size);
 282
 283             constraint_parameter_flag=
 284                 s->width <= 768 && s->height <= 576 &&
 285                 s->mb_width * s->mb_height <= 396 &&
 286                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 287                 framerate.num <= framerate.den*30 &&
 288                 s->avctx->me_range && s->avctx->me_range < 128 &&
 289                 vbv_buffer_size <= 20 &&
 290                 v <= 1856000/400 &&
 291                 s->codec_id == AV_CODEC_ID_MPEG1VIDEO;
 292
 293             put_bits(&s->pb, 1, constraint_parameter_flag);
 294
 295             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 296             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 297
 298             if(s->codec_id == AV_CODEC_ID_MPEG2VIDEO){
 299                 put_header(s, EXT_START_CODE);
 300                 put_bits(&s->pb, 4, 1); //seq ext
 301
 302                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 303
 304                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 305                 put_bits(&s->pb, 4, s->avctx->level); //level
 306
 307                 put_bits(&s->pb, 1, s->progressive_sequence);
 308                 put_bits(&s->pb, 2, s->chroma_format);
 309                 put_bits(&s->pb, 2, s->width >>12);
 310                 put_bits(&s->pb, 2, s->height>>12);
 311                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 312                 put_bits(&s->pb, 1, 1); //marker
 313                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 314                 put_bits(&s->pb, 1, s->low_delay);
 315                 put_bits(&s->pb, 2, s->mpeg2_frame_rate_ext.num-1); // frame_rate_ext_n
 316                 put_bits(&s->pb, 5, s->mpeg2_frame_rate_ext.den-1); // frame_rate_ext_d
 317             }
 318
 319             put_header(s, GOP_START_CODE);
 320             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
 321             /* time code : we must convert from the real frame rate to a
 322                fake mpeg frame rate in case of low frame rate */
 323             fps = (framerate.num + framerate.den/2)/ framerate.den;
 324             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
 325
 326             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 327             av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));
 328             if (s->drop_frame_timecode)
 329                 time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);
 330             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 331             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 332             put_bits(&s->pb, 1, 1);
 333             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 334             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 335             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 336             put_bits(&s->pb, 1, 0); /* broken link */
 337         }
 338 }
 339
 340 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 341     while (run >= 33) {
 342         put_bits(&s->pb, 11, 0x008);
 343         run -= 33;
 344     }
 345     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 346              ff_mpeg12_mbAddrIncrTable[run][0]);
 347 }
 348
 349 static av_always_inline void put_qscale(MpegEncContext *s)
 350 {
 351     if(s->q_scale_type){
 352         av_assert2(s->qscale>=1 && s->qscale <=12);
 353         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 354     }else{
 355         put_bits(&s->pb, 5, s->qscale);
 356     }
 357 }
 358
 359 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 360     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
 361         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 362         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
 363     } else {
 364         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 365     }
 366     put_qscale(s);
 367     put_bits(&s->pb, 1, 0); /* slice extra information */
 368 }
 369
 370 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 371 {
 372     mpeg1_encode_sequence_header(s);
 373
 374     /* mpeg1 picture header */
 375     put_header(s, PICTURE_START_CODE);
 376     /* temporal reference */
 377
 378     // RAL: s->picture_number instead of s->fake_picture_number
 379     put_bits(&s->pb, 10, (s->picture_number -
 380                           s->gop_picture_number) & 0x3ff);
 381     put_bits(&s->pb, 3, s->pict_type);
 382
 383     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 384     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 385
 386     // RAL: Forward f_code also needed for B frames
 387     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 388         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 389         if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 390             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 391         else
 392             put_bits(&s->pb, 3, 7); /* forward_f_code */
 393     }
 394
 395     // RAL: Backward f_code necessary for B frames
 396     if (s->pict_type == AV_PICTURE_TYPE_B) {
 397         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 398         if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
 399             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 400         else
 401             put_bits(&s->pb, 3, 7); /* backward_f_code */
 402     }
 403
 404     put_bits(&s->pb, 1, 0); /* extra bit picture */
 405
 406     s->frame_pred_frame_dct = 1;
 407     if(s->codec_id == AV_CODEC_ID_MPEG2VIDEO){
 408         put_header(s, EXT_START_CODE);
 409         put_bits(&s->pb, 4, 8); //pic ext
 410         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 411             put_bits(&s->pb, 4, s->f_code);
 412             put_bits(&s->pb, 4, s->f_code);
 413         }else{
 414             put_bits(&s->pb, 8, 255);
 415         }
 416         if (s->pict_type == AV_PICTURE_TYPE_B) {
 417             put_bits(&s->pb, 4, s->b_code);
 418             put_bits(&s->pb, 4, s->b_code);
 419         }else{
 420             put_bits(&s->pb, 8, 255);
 421         }
 422         put_bits(&s->pb, 2, s->intra_dc_precision);
 423
 424         av_assert0(s->picture_structure == PICT_FRAME);
 425         put_bits(&s->pb, 2, s->picture_structure);
 426         if (s->progressive_sequence) {
 427             put_bits(&s->pb, 1, 0); /* no repeat */
 428         } else {
 429             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 430         }
 431         /* XXX: optimize the generation of this flag with entropy
 432            measures */
 433         s->frame_pred_frame_dct = s->progressive_sequence;
 434
 435         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 436         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 437         put_bits(&s->pb, 1, s->q_scale_type);
 438         put_bits(&s->pb, 1, s->intra_vlc_format);
 439         put_bits(&s->pb, 1, s->alternate_scan);
 440         put_bits(&s->pb, 1, s->repeat_first_field);
 441         s->progressive_frame = s->progressive_sequence;
 442         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 443         put_bits(&s->pb, 1, s->progressive_frame);
 444         put_bits(&s->pb, 1, 0); //composite_display_flag
 445     }
 446     if (s->scan_offset) {
 447         int i;
 448
 449         put_header(s, USER_START_CODE);
 450         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 451             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 452         }
 453     }
 454
 455     s->mb_y=0;
 456     ff_mpeg1_encode_slice_header(s);
 457 }
 458
 459 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 460                                 int has_mv, int field_motion)
 461 {
 462     put_bits(&s->pb, n, bits);
 463     if (!s->frame_pred_frame_dct) {
 464         if (has_mv)
 465             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 466         put_bits(&s->pb, 1, s->interlaced_dct);
 467     }
 468 }
 469
 470 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 471                                                    DCTELEM block[6][64],
 472                                                    int motion_x, int motion_y,
 473                                                    int mb_block_count)
 474 {
 475     int i, cbp;
 476     const int mb_x = s->mb_x;
 477     const int mb_y = s->mb_y;
 478     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 479
 480     /* compute cbp */
 481     cbp = 0;
 482     for(i=0;i<mb_block_count;i++) {
 483         if (s->block_last_index[i] >= 0)
 484             cbp |= 1 << (mb_block_count - 1 - i);
 485     }
 486
 487     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 488         (mb_x != s->mb_width - 1 || (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
 489         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 490         (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) |
 491         ((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))) {
 492         s->mb_skip_run++;
 493         s->qscale -= s->dquant;
 494         s->skip_count++;
 495         s->misc_bits++;
 496         s->last_bits++;
 497         if(s->pict_type == AV_PICTURE_TYPE_P){
 498             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 499             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 500         }
 501     } else {
 502         if(first_mb){
 503             av_assert0(s->mb_skip_run == 0);
 504             encode_mb_skip_run(s, s->mb_x);
 505         }else{
 506             encode_mb_skip_run(s, s->mb_skip_run);
 507         }
 508
 509         if (s->pict_type == AV_PICTURE_TYPE_I) {
 510             if(s->dquant && cbp){
 511                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 512                 put_qscale(s);
 513             }else{
 514                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 515                 s->qscale -= s->dquant;
 516             }
 517             s->misc_bits+= get_bits_diff(s);
 518             s->i_count++;
 519         } else if (s->mb_intra) {
 520             if(s->dquant && cbp){
 521                 put_mb_modes(s, 6, 0x01, 0, 0);
 522                 put_qscale(s);
 523             }else{
 524                 put_mb_modes(s, 5, 0x03, 0, 0);
 525                 s->qscale -= s->dquant;
 526             }
 527             s->misc_bits+= get_bits_diff(s);
 528             s->i_count++;
 529             memset(s->last_mv, 0, sizeof(s->last_mv));
 530         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 531             if(s->mv_type == MV_TYPE_16X16){
 532                 if (cbp != 0) {
 533                     if ((motion_x|motion_y) == 0) {
 534                         if(s->dquant){
 535                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 536                             put_qscale(s);
 537                         }else{
 538                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 539                         }
 540                         s->misc_bits+= get_bits_diff(s);
 541                     } else {
 542                         if(s->dquant){
 543                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 544                             put_qscale(s);
 545                         }else{
 546                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 547                         }
 548                         s->misc_bits+= get_bits_diff(s);
 549                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 550                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 551                         s->mv_bits+= get_bits_diff(s);
 552                     }
 553                 } else {
 554                     put_bits(&s->pb, 3, 1); /* motion only */
 555                     if (!s->frame_pred_frame_dct)
 556                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 557                     s->misc_bits+= get_bits_diff(s);
 558                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 559                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 560                     s->qscale -= s->dquant;
 561                     s->mv_bits+= get_bits_diff(s);
 562                 }
 563                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 564                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 565             }else{
 566                 av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 567
 568                 if (cbp) {
 569                     if(s->dquant){
 570                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 571                         put_qscale(s);
 572                     }else{
 573                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 574                     }
 575                 } else {
 576                     put_bits(&s->pb, 3, 1); /* motion only */
 577                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 578                     s->qscale -= s->dquant;
 579                 }
 580                 s->misc_bits+= get_bits_diff(s);
 581                 for(i=0; i<2; i++){
 582                     put_bits(&s->pb, 1, s->field_select[0][i]);
 583                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 584                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 585                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 586                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 587                 }
 588                 s->mv_bits+= get_bits_diff(s);
 589             }
 590             if(cbp) {
 591                 if (s->chroma_y_shift) {
 592                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 593                 } else {
 594                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 595                     put_sbits(&s->pb, 2, cbp);
 596                 }
 597             }
 598             s->f_count++;
 599         } else{
 600             if(s->mv_type == MV_TYPE_16X16){
 601                 if (cbp){    // With coded bloc pattern
 602                     if (s->dquant) {
 603                         if(s->mv_dir == MV_DIR_FORWARD)
 604                             put_mb_modes(s, 6, 3, 1, 0);
 605                         else
 606                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
 607                         put_qscale(s);
 608                     } else {
 609                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
 610                     }
 611                 }else{    // No coded bloc pattern
 612                     put_bits(&s->pb, 5-s->mv_dir, 2);
 613                     if (!s->frame_pred_frame_dct)
 614                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 615                     s->qscale -= s->dquant;
 616                 }
 617                 s->misc_bits += get_bits_diff(s);
 618                 if (s->mv_dir&MV_DIR_FORWARD){
 619                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 620                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 621                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 622                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 623                     s->f_count++;
 624                 }
 625                 if (s->mv_dir&MV_DIR_BACKWARD){
 626                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 627                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 628                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 629                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 630                     s->b_count++;
 631                 }
 632             }else{
 633                 av_assert2(s->mv_type == MV_TYPE_FIELD);
 634                 av_assert2(!s->frame_pred_frame_dct);
 635                 if (cbp){    // With coded bloc pattern
 636                     if (s->dquant) {
 637                         if(s->mv_dir == MV_DIR_FORWARD)
 638                             put_mb_modes(s, 6, 3, 1, 1);
 639                         else
 640                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
 641                         put_qscale(s);
 642                     } else {
 643                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
 644                     }
 645                 }else{    // No coded bloc pattern
 646                     put_bits(&s->pb, 5-s->mv_dir, 2);
 647                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 648                     s->qscale -= s->dquant;
 649                 }
 650                 s->misc_bits += get_bits_diff(s);
 651                 if (s->mv_dir&MV_DIR_FORWARD){
 652                     for(i=0; i<2; i++){
 653                         put_bits(&s->pb, 1, s->field_select[0][i]);
 654                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 655                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 656                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 657                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 658                     }
 659                     s->f_count++;
 660                 }
 661                 if (s->mv_dir&MV_DIR_BACKWARD){
 662                     for(i=0; i<2; i++){
 663                         put_bits(&s->pb, 1, s->field_select[1][i]);
 664                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 665                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 666                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 667                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 668                     }
 669                     s->b_count++;
 670                 }
 671             }
 672             s->mv_bits += get_bits_diff(s);
 673             if(cbp) {
 674                 if (s->chroma_y_shift) {
 675                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 676                 } else {
 677                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 678                     put_sbits(&s->pb, 2, cbp);
 679                 }
 680             }
 681         }
 682         for(i=0;i<mb_block_count;i++) {
 683             if (cbp & (1 << (mb_block_count - 1 - i))) {
 684                 mpeg1_encode_block(s, block[i], i);
 685             }
 686         }
 687         s->mb_skip_run = 0;
 688         if(s->mb_intra)
 689             s->i_tex_bits+= get_bits_diff(s);
 690         else
 691             s->p_tex_bits+= get_bits_diff(s);
 692     }
 693 }
 694
 695 void ff_mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
 696 {
 697     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 698     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 699 }
 700
 701 // RAL: Parameter added: f_or_b_code
 702 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 703 {
 704     if (val == 0) {
 705         /* zero vector */
 706         put_bits(&s->pb,
 707                  ff_mpeg12_mbMotionVectorTable[0][1],
 708                  ff_mpeg12_mbMotionVectorTable[0][0]);
 709     } else {
 710         int code, sign, bits;
 711         int bit_size = f_or_b_code - 1;
 712         int range = 1 << bit_size;
 713         /* modulo encoding */
 714         val = sign_extend(val, 5 + bit_size);
 715
 716         if (val >= 0) {
 717             val--;
 718             code = (val >> bit_size) + 1;
 719             bits = val & (range - 1);
 720             sign = 0;
 721         } else {
 722             val = -val;
 723             val--;
 724             code = (val >> bit_size) + 1;
 725             bits = val & (range - 1);
 726             sign = 1;
 727         }
 728
 729         av_assert2(code > 0 && code <= 16);
 730
 731         put_bits(&s->pb,
 732                  ff_mpeg12_mbMotionVectorTable[code][1],
 733                  ff_mpeg12_mbMotionVectorTable[code][0]);
 734
 735         put_bits(&s->pb, 1, sign);
 736         if (bit_size > 0) {
 737             put_bits(&s->pb, bit_size, bits);
 738         }
 739     }
 740 }
 741
 742 void ff_mpeg1_encode_init(MpegEncContext *s)
 743 {
 744     static int done=0;
 745
 746     ff_mpeg12_common_init(s);
 747
 748     if(!done){
 749         int f_code;
 750         int mv;
 751         int i;
 752
 753         done=1;
 754         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 755         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 756
 757         for(i=0; i<64; i++)
 758         {
 759                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
 760                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
 761         }
 762
 763         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 764         if(s->intra_vlc_format)
 765             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 766
 767         /* build unified dc encoding tables */
 768         for(i=-255; i<256; i++)
 769         {
 770                 int adiff, index;
 771                 int bits, code;
 772                 int diff=i;
 773
 774                 adiff = FFABS(diff);
 775                 if(diff<0) diff--;
 776                 index = av_log2(2*adiff);
 777
 778                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
 779                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 780                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 781
 782                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 783                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 784                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 785         }
 786
 787         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 788             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 789                 int len;
 790
 791                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
 792                 else{
 793                     int val, bit_size, code;
 794
 795                     bit_size = f_code - 1;
 796
 797                     val=mv;
 798                     if (val < 0)
 799                         val = -val;
 800                     val--;
 801                     code = (val >> bit_size) + 1;
 802                     if(code<17){
 803                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
 804                     }else{
 805                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
 806                     }
 807                 }
 808
 809                 mv_penalty[f_code][mv+MAX_MV]= len;
 810             }
 811         }
 812
 813
 814         for(f_code=MAX_FCODE; f_code>0; f_code--){
 815             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 816                 fcode_tab[mv+MAX_MV]= f_code;
 817             }
 818         }
 819     }
 820     s->me.mv_penalty= mv_penalty;
 821     s->fcode_tab= fcode_tab;
 822     if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO){
 823         s->min_qcoeff=-255;
 824         s->max_qcoeff= 255;
 825     }else{
 826         s->min_qcoeff=-2047;
 827         s->max_qcoeff= 2047;
 828     }
 829     if (s->intra_vlc_format) {
 830         s->intra_ac_vlc_length=
 831         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 832     } else {
 833         s->intra_ac_vlc_length=
 834         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 835     }
 836     s->inter_ac_vlc_length=
 837     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 838 }
 839
 840 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 841 {
 842   if(((unsigned) (diff+255)) >= 511){
 843         int index;
 844
 845         if(diff<0){
 846             index= av_log2_16bit(-2*diff);
 847             diff--;
 848         }else{
 849             index= av_log2_16bit(2*diff);
 850         }
 851         if (component == 0) {
 852             put_bits(
 853                 &s->pb,
 854                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
 855                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 856         }else{
 857             put_bits(
 858                 &s->pb,
 859                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 860                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 861         }
 862   }else{
 863     if (component == 0) {
 864         put_bits(
 865             &s->pb,
 866             mpeg1_lum_dc_uni[diff+255]&0xFF,
 867             mpeg1_lum_dc_uni[diff+255]>>8);
 868     } else {
 869         put_bits(
 870             &s->pb,
 871             mpeg1_chr_dc_uni[diff+255]&0xFF,
 872             mpeg1_chr_dc_uni[diff+255]>>8);
 873     }
 874   }
 875 }
 876
 877 static void mpeg1_encode_block(MpegEncContext *s,
 878                                DCTELEM *block,
 879                                int n)
 880 {
 881     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 882     int code, component;
 883     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 884
 885     last_index = s->block_last_index[n];
 886
 887     /* DC coef */
 888     if (s->mb_intra) {
 889         component = (n <= 3 ? 0 : (n&1) + 1);
 890         dc = block[0]; /* overflow is impossible */
 891         diff = dc - s->last_dc[component];
 892         encode_dc(s, diff, component);
 893         s->last_dc[component] = dc;
 894         i = 1;
 895         if (s->intra_vlc_format)
 896             table_vlc = ff_rl_mpeg2.table_vlc;
 897     } else {
 898         /* encode the first coefficient : needs to be done here because
 899            it is handled slightly differently */
 900         level = block[0];
 901         if (abs(level) == 1) {
 902                 code = ((uint32_t)level >> 31); /* the sign bit */
 903                 put_bits(&s->pb, 2, code | 0x02);
 904                 i = 1;
 905         } else {
 906             i = 0;
 907             last_non_zero = -1;
 908             goto next_coef;
 909         }
 910     }
 911
 912     /* now quantify & encode AC coefs */
 913     last_non_zero = i - 1;
 914
 915     for(;i<=last_index;i++) {
 916         j = s->intra_scantable.permutated[i];
 917         level = block[j];
 918     next_coef:
 919         /* encode using VLC */
 920         if (level != 0) {
 921             run = i - last_non_zero - 1;
 922
 923             alevel= level;
 924             MASK_ABS(sign, alevel);
 925             sign&=1;
 926
 927             if (alevel <= mpeg1_max_level[0][run]){
 928                 code= mpeg1_index_run[0][run] + alevel - 1;
 929                 /* store the vlc & sign at once */
 930                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
 931             } else {
 932                 /* escape seems to be pretty rare <5% so I do not optimize it */
 933                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 934                 /* escape: only clip in this case */
 935                 put_bits(&s->pb, 6, run);
 936                 if(s->codec_id == AV_CODEC_ID_MPEG1VIDEO){
 937                     if (alevel < 128) {
 938                         put_sbits(&s->pb, 8, level);
 939                     } else {
 940                         if (level < 0) {
 941                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 942                         } else {
 943                             put_sbits(&s->pb, 16, level);
 944                         }
 945                     }
 946                 }else{
 947                     put_sbits(&s->pb, 12, level);
 948                 }
 949             }
 950             last_non_zero = i;
 951         }
 952     }
 953     /* end of block */
 954     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 955 }
 956
 957 #define OFFSET(x) offsetof(MpegEncContext, x)
 958 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 959 #define COMMON_OPTS\
 960     { "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 },\
 961     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },\
 962     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE}, \
 963     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 964
 965 static const AVOption mpeg1_options[] = {
 966     COMMON_OPTS
 967     FF_MPV_COMMON_OPTS
 968     { NULL },
 969 };
 970
 971 static const AVOption mpeg2_options[] = {
 972     COMMON_OPTS
 973     { "non_linear_quant",    "Use nonlinear quantizer.",          OFFSET(q_scale_type),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 974     { "alternate_scan",      "Enable alternate scantable.",       OFFSET(alternate_scan),       AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
 975     FF_MPV_COMMON_OPTS
 976     { NULL },
 977 };
 978
 979 #define mpeg12_class(x)\
 980 static const AVClass mpeg## x ##_class = {\
 981     .class_name   = "mpeg" #x "video encoder",\
 982     .item_name    = av_default_item_name,\
 983     .option       = mpeg## x ##_options,\
 984     .version      = LIBAVUTIL_VERSION_INT,\
 985 };
 986
 987 mpeg12_class(1)
 988 mpeg12_class(2)
 989
 990 AVCodec ff_mpeg1video_encoder = {
 991     .name                 = "mpeg1video",
 992     .type                 = AVMEDIA_TYPE_VIDEO,
 993     .id                   = AV_CODEC_ID_MPEG1VIDEO,
 994     .priv_data_size       = sizeof(MpegEncContext),
 995     .init                 = encode_init,
 996     .encode2              = ff_MPV_encode_picture,
 997     .close                = ff_MPV_encode_end,
 998     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,
 999     .pix_fmts             = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,
1000                                                         AV_PIX_FMT_NONE },
1001     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1002     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
1003     .priv_class           = &mpeg1_class,
1004 };
1005
1006 AVCodec ff_mpeg2video_encoder = {
1007     .name                 = "mpeg2video",
1008     .type                 = AVMEDIA_TYPE_VIDEO,
1009     .id                   = AV_CODEC_ID_MPEG2VIDEO,
1010     .priv_data_size       = sizeof(MpegEncContext),
1011     .init                 = encode_init,
1012     .encode2              = ff_MPV_encode_picture,
1013     .close                = ff_MPV_encode_end,
1014     .supported_framerates = ff_mpeg2_frame_rate_tab,
1015     .pix_fmts             = (const enum AVPixelFormat[]){
1016         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE
1017     },
1018     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1019     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1020     .priv_class           = &mpeg2_class,
1021 };