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 "timecode.h"
  37 #include "libavutil/log.h"
  38 #include "libavutil/opt.h"
  39 #include "libavutil/avassert.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     int64_t dmin= INT64_MAX;
 112     int64_t d;
 113
 114     for(i=1;i<14;i++) {
 115         int64_t n0= 1001LL/avpriv_frame_rate_tab[i].den*avpriv_frame_rate_tab[i].num*s->avctx->time_base.num;
 116         int64_t n1= 1001LL*s->avctx->time_base.den;
 117         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL && i>=9) break;
 118
 119         d = FFABS(n0 - n1);
 120         if(d < dmin){
 121             dmin=d;
 122             s->frame_rate_index= i;
 123         }
 124     }
 125     if(dmin)
 126         return -1;
 127     else
 128         return 0;
 129 }
 130
 131 static av_cold int encode_init(AVCodecContext *avctx)
 132 {
 133     MpegEncContext *s = avctx->priv_data;
 134
 135     if(MPV_encode_init(avctx) < 0)
 136         return -1;
 137
 138 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
 139     if (avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE)
 140         s->drop_frame_timecode = 1;
 141     if (avctx->flags & CODEC_FLAG_SVCD_SCAN_OFFSET)
 142         s->scan_offset = 1;
 143 #endif
 144
 145     if(find_frame_rate_index(s) < 0){
 146         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
 147             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
 148             return -1;
 149         }else{
 150             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);
 151         }
 152     }
 153
 154     if(avctx->profile == FF_PROFILE_UNKNOWN){
 155         if(avctx->level != FF_LEVEL_UNKNOWN){
 156             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 157             return -1;
 158         }
 159         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
 160     }
 161
 162     if(avctx->level == FF_LEVEL_UNKNOWN){
 163         if(avctx->profile == 0){ /* 4:2:2 */
 164             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
 165             else                                            avctx->level = 2; /* High */
 166         }else{
 167             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
 168                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 169                 return -1;
 170             }
 171             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
 172             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
 173             else                                            avctx->level = 4; /* High */
 174         }
 175     }
 176
 177     s->drop_frame_timecode = s->tc.drop = s->drop_frame_timecode || !!(avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE);
 178     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 179         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 180         return -1;
 181     }
 182
 183     if (s->tc.str) {
 184         s->tc.rate = avpriv_frame_rate_tab[s->frame_rate_index];
 185         if (avpriv_init_smpte_timecode(s, &s->tc) < 0)
 186             return -1;
 187         s->drop_frame_timecode = s->tc.drop;
 188         s->avctx->timecode_frame_start = s->tc.start;
 189     } else {
 190         s->avctx->timecode_frame_start = 0; // default is -1
 191     }
 192     return 0;
 193 }
 194
 195 static void put_header(MpegEncContext *s, int header)
 196 {
 197     avpriv_align_put_bits(&s->pb);
 198     put_bits(&s->pb, 16, header>>16);
 199     put_sbits(&s->pb, 16, header);
 200 }
 201
 202 /* put sequence header if needed */
 203 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 204 {
 205         unsigned int vbv_buffer_size;
 206         unsigned int fps, v;
 207         int i;
 208         uint64_t time_code;
 209         float best_aspect_error= 1E10;
 210         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 211         int constraint_parameter_flag;
 212
 213         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 214
 215         if (s->current_picture.f.key_frame) {
 216             AVRational framerate= avpriv_frame_rate_tab[s->frame_rate_index];
 217
 218             /* mpeg1 header repeated every gop */
 219             put_header(s, SEQ_START_CODE);
 220
 221             put_sbits(&s->pb, 12, s->width );
 222             put_sbits(&s->pb, 12, s->height);
 223
 224             for(i=1; i<15; i++){
 225                 float error= aspect_ratio;
 226                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
 227                     error-= 1.0/ff_mpeg1_aspect[i];
 228                 else
 229                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
 230
 231                 error= FFABS(error);
 232
 233                 if(error < best_aspect_error){
 234                     best_aspect_error= error;
 235                     s->aspect_ratio_info= i;
 236                 }
 237             }
 238
 239             put_bits(&s->pb, 4, s->aspect_ratio_info);
 240             put_bits(&s->pb, 4, s->frame_rate_index);
 241
 242             if(s->avctx->rc_max_rate){
 243                 v = (s->avctx->rc_max_rate + 399) / 400;
 244                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
 245                     v = 0x3ffff;
 246             }else{
 247                 v= 0x3FFFF;
 248             }
 249
 250             if(s->avctx->rc_buffer_size)
 251                 vbv_buffer_size = s->avctx->rc_buffer_size;
 252             else
 253                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 254                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 255             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 256
 257             put_sbits(&s->pb, 18, v);
 258             put_bits(&s->pb, 1, 1); /* marker */
 259             put_sbits(&s->pb, 10, vbv_buffer_size);
 260
 261             constraint_parameter_flag=
 262                 s->width <= 768 && s->height <= 576 &&
 263                 s->mb_width * s->mb_height <= 396 &&
 264                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 265                 framerate.num <= framerate.den*30 &&
 266                 s->avctx->me_range && s->avctx->me_range < 128 &&
 267                 vbv_buffer_size <= 20 &&
 268                 v <= 1856000/400 &&
 269                 s->codec_id == CODEC_ID_MPEG1VIDEO;
 270
 271             put_bits(&s->pb, 1, constraint_parameter_flag);
 272
 273             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 274             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 275
 276             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 277                 put_header(s, EXT_START_CODE);
 278                 put_bits(&s->pb, 4, 1); //seq ext
 279
 280                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 281
 282                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 283                 put_bits(&s->pb, 4, s->avctx->level); //level
 284
 285                 put_bits(&s->pb, 1, s->progressive_sequence);
 286                 put_bits(&s->pb, 2, s->chroma_format);
 287                 put_bits(&s->pb, 2, s->width >>12);
 288                 put_bits(&s->pb, 2, s->height>>12);
 289                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 290                 put_bits(&s->pb, 1, 1); //marker
 291                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 292                 put_bits(&s->pb, 1, s->low_delay);
 293                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
 294                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
 295             }
 296
 297             put_header(s, GOP_START_CODE);
 298             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
 299             /* time code : we must convert from the real frame rate to a
 300                fake mpeg frame rate in case of low frame rate */
 301             fps = (framerate.num + framerate.den/2)/ framerate.den;
 302             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
 303
 304             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 305             av_assert0(s->drop_frame_timecode == s->tc.drop);
 306             if (s->tc.drop)
 307                 time_code = avpriv_framenum_to_drop_timecode(time_code);
 308             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 309             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 310             put_bits(&s->pb, 1, 1);
 311             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 312             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 313             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 314             put_bits(&s->pb, 1, 0); /* broken link */
 315         }
 316 }
 317
 318 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 319     while (run >= 33) {
 320         put_bits(&s->pb, 11, 0x008);
 321         run -= 33;
 322     }
 323     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 324              ff_mpeg12_mbAddrIncrTable[run][0]);
 325 }
 326
 327 static av_always_inline void put_qscale(MpegEncContext *s)
 328 {
 329     if(s->q_scale_type){
 330         assert(s->qscale>=1 && s->qscale <=12);
 331         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 332     }else{
 333         put_bits(&s->pb, 5, s->qscale);
 334     }
 335 }
 336
 337 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 338     if (s->height > 2800) {
 339         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 340         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
 341     } else {
 342         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 343     }
 344     put_qscale(s);
 345     put_bits(&s->pb, 1, 0); /* slice extra information */
 346 }
 347
 348 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 349 {
 350     mpeg1_encode_sequence_header(s);
 351
 352     /* mpeg1 picture header */
 353     put_header(s, PICTURE_START_CODE);
 354     /* temporal reference */
 355
 356     // RAL: s->picture_number instead of s->fake_picture_number
 357     put_bits(&s->pb, 10, (s->picture_number -
 358                           s->gop_picture_number) & 0x3ff);
 359     put_bits(&s->pb, 3, s->pict_type);
 360
 361     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 362     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 363
 364     // RAL: Forward f_code also needed for B frames
 365     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 366         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 367         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 368             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 369         else
 370             put_bits(&s->pb, 3, 7); /* forward_f_code */
 371     }
 372
 373     // RAL: Backward f_code necessary for B frames
 374     if (s->pict_type == AV_PICTURE_TYPE_B) {
 375         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 376         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 377             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 378         else
 379             put_bits(&s->pb, 3, 7); /* backward_f_code */
 380     }
 381
 382     put_bits(&s->pb, 1, 0); /* extra bit picture */
 383
 384     s->frame_pred_frame_dct = 1;
 385     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 386         put_header(s, EXT_START_CODE);
 387         put_bits(&s->pb, 4, 8); //pic ext
 388         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 389             put_bits(&s->pb, 4, s->f_code);
 390             put_bits(&s->pb, 4, s->f_code);
 391         }else{
 392             put_bits(&s->pb, 8, 255);
 393         }
 394         if (s->pict_type == AV_PICTURE_TYPE_B) {
 395             put_bits(&s->pb, 4, s->b_code);
 396             put_bits(&s->pb, 4, s->b_code);
 397         }else{
 398             put_bits(&s->pb, 8, 255);
 399         }
 400         put_bits(&s->pb, 2, s->intra_dc_precision);
 401
 402         assert(s->picture_structure == PICT_FRAME);
 403         put_bits(&s->pb, 2, s->picture_structure);
 404         if (s->progressive_sequence) {
 405             put_bits(&s->pb, 1, 0); /* no repeat */
 406         } else {
 407             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 408         }
 409         /* XXX: optimize the generation of this flag with entropy
 410            measures */
 411         s->frame_pred_frame_dct = s->progressive_sequence;
 412
 413         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 414         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 415         put_bits(&s->pb, 1, s->q_scale_type);
 416         put_bits(&s->pb, 1, s->intra_vlc_format);
 417         put_bits(&s->pb, 1, s->alternate_scan);
 418         put_bits(&s->pb, 1, s->repeat_first_field);
 419         s->progressive_frame = s->progressive_sequence;
 420         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 421         put_bits(&s->pb, 1, s->progressive_frame);
 422         put_bits(&s->pb, 1, 0); //composite_display_flag
 423     }
 424     if (s->scan_offset) {
 425         int i;
 426
 427         put_header(s, USER_START_CODE);
 428         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 429             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 430         }
 431     }
 432
 433     s->mb_y=0;
 434     ff_mpeg1_encode_slice_header(s);
 435 }
 436
 437 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 438                                 int has_mv, int field_motion)
 439 {
 440     put_bits(&s->pb, n, bits);
 441     if (!s->frame_pred_frame_dct) {
 442         if (has_mv)
 443             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 444         put_bits(&s->pb, 1, s->interlaced_dct);
 445     }
 446 }
 447
 448 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 449                                                    DCTELEM block[6][64],
 450                                                    int motion_x, int motion_y,
 451                                                    int mb_block_count)
 452 {
 453     int i, cbp;
 454     const int mb_x = s->mb_x;
 455     const int mb_y = s->mb_y;
 456     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 457
 458     /* compute cbp */
 459     cbp = 0;
 460     for(i=0;i<mb_block_count;i++) {
 461         if (s->block_last_index[i] >= 0)
 462             cbp |= 1 << (mb_block_count - 1 - i);
 463     }
 464
 465     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 466         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
 467         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 468         (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) |
 469         ((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))) {
 470         s->mb_skip_run++;
 471         s->qscale -= s->dquant;
 472         s->skip_count++;
 473         s->misc_bits++;
 474         s->last_bits++;
 475         if(s->pict_type == AV_PICTURE_TYPE_P){
 476             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 477             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 478         }
 479     } else {
 480         if(first_mb){
 481             assert(s->mb_skip_run == 0);
 482             encode_mb_skip_run(s, s->mb_x);
 483         }else{
 484             encode_mb_skip_run(s, s->mb_skip_run);
 485         }
 486
 487         if (s->pict_type == AV_PICTURE_TYPE_I) {
 488             if(s->dquant && cbp){
 489                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 490                 put_qscale(s);
 491             }else{
 492                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 493                 s->qscale -= s->dquant;
 494             }
 495             s->misc_bits+= get_bits_diff(s);
 496             s->i_count++;
 497         } else if (s->mb_intra) {
 498             if(s->dquant && cbp){
 499                 put_mb_modes(s, 6, 0x01, 0, 0);
 500                 put_qscale(s);
 501             }else{
 502                 put_mb_modes(s, 5, 0x03, 0, 0);
 503                 s->qscale -= s->dquant;
 504             }
 505             s->misc_bits+= get_bits_diff(s);
 506             s->i_count++;
 507             memset(s->last_mv, 0, sizeof(s->last_mv));
 508         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 509             if(s->mv_type == MV_TYPE_16X16){
 510                 if (cbp != 0) {
 511                     if ((motion_x|motion_y) == 0) {
 512                         if(s->dquant){
 513                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 514                             put_qscale(s);
 515                         }else{
 516                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 517                         }
 518                         s->misc_bits+= get_bits_diff(s);
 519                     } else {
 520                         if(s->dquant){
 521                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 522                             put_qscale(s);
 523                         }else{
 524                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 525                         }
 526                         s->misc_bits+= get_bits_diff(s);
 527                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 528                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 529                         s->mv_bits+= get_bits_diff(s);
 530                     }
 531                 } else {
 532                     put_bits(&s->pb, 3, 1); /* motion only */
 533                     if (!s->frame_pred_frame_dct)
 534                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 535                     s->misc_bits+= get_bits_diff(s);
 536                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 537                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 538                     s->qscale -= s->dquant;
 539                     s->mv_bits+= get_bits_diff(s);
 540                 }
 541                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 542                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 543             }else{
 544                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 545
 546                 if (cbp) {
 547                     if(s->dquant){
 548                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 549                         put_qscale(s);
 550                     }else{
 551                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 552                     }
 553                 } else {
 554                     put_bits(&s->pb, 3, 1); /* motion only */
 555                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 556                     s->qscale -= s->dquant;
 557                 }
 558                 s->misc_bits+= get_bits_diff(s);
 559                 for(i=0; i<2; i++){
 560                     put_bits(&s->pb, 1, s->field_select[0][i]);
 561                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 562                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 563                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 564                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 565                 }
 566                 s->mv_bits+= get_bits_diff(s);
 567             }
 568             if(cbp) {
 569                 if (s->chroma_y_shift) {
 570                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 571                 } else {
 572                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 573                     put_sbits(&s->pb, 2, cbp);
 574                 }
 575             }
 576             s->f_count++;
 577         } else{
 578             if(s->mv_type == MV_TYPE_16X16){
 579                 if (cbp){    // With coded bloc pattern
 580                     if (s->dquant) {
 581                         if(s->mv_dir == MV_DIR_FORWARD)
 582                             put_mb_modes(s, 6, 3, 1, 0);
 583                         else
 584                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
 585                         put_qscale(s);
 586                     } else {
 587                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
 588                     }
 589                 }else{    // No coded bloc pattern
 590                     put_bits(&s->pb, 5-s->mv_dir, 2);
 591                     if (!s->frame_pred_frame_dct)
 592                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 593                     s->qscale -= s->dquant;
 594                 }
 595                 s->misc_bits += get_bits_diff(s);
 596                 if (s->mv_dir&MV_DIR_FORWARD){
 597                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 598                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 599                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 600                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 601                     s->f_count++;
 602                 }
 603                 if (s->mv_dir&MV_DIR_BACKWARD){
 604                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 605                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 606                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 607                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 608                     s->b_count++;
 609                 }
 610             }else{
 611                 assert(s->mv_type == MV_TYPE_FIELD);
 612                 assert(!s->frame_pred_frame_dct);
 613                 if (cbp){    // With coded bloc pattern
 614                     if (s->dquant) {
 615                         if(s->mv_dir == MV_DIR_FORWARD)
 616                             put_mb_modes(s, 6, 3, 1, 1);
 617                         else
 618                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
 619                         put_qscale(s);
 620                     } else {
 621                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
 622                     }
 623                 }else{    // No coded bloc pattern
 624                     put_bits(&s->pb, 5-s->mv_dir, 2);
 625                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 626                     s->qscale -= s->dquant;
 627                 }
 628                 s->misc_bits += get_bits_diff(s);
 629                 if (s->mv_dir&MV_DIR_FORWARD){
 630                     for(i=0; i<2; i++){
 631                         put_bits(&s->pb, 1, s->field_select[0][i]);
 632                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 633                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 634                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 635                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 636                     }
 637                     s->f_count++;
 638                 }
 639                 if (s->mv_dir&MV_DIR_BACKWARD){
 640                     for(i=0; i<2; i++){
 641                         put_bits(&s->pb, 1, s->field_select[1][i]);
 642                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 643                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 644                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 645                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 646                     }
 647                     s->b_count++;
 648                 }
 649             }
 650             s->mv_bits += get_bits_diff(s);
 651             if(cbp) {
 652                 if (s->chroma_y_shift) {
 653                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 654                 } else {
 655                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 656                     put_sbits(&s->pb, 2, cbp);
 657                 }
 658             }
 659         }
 660         for(i=0;i<mb_block_count;i++) {
 661             if (cbp & (1 << (mb_block_count - 1 - i))) {
 662                 mpeg1_encode_block(s, block[i], i);
 663             }
 664         }
 665         s->mb_skip_run = 0;
 666         if(s->mb_intra)
 667             s->i_tex_bits+= get_bits_diff(s);
 668         else
 669             s->p_tex_bits+= get_bits_diff(s);
 670     }
 671 }
 672
 673 void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
 674 {
 675     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 676     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 677 }
 678
 679 // RAL: Parameter added: f_or_b_code
 680 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 681 {
 682     if (val == 0) {
 683         /* zero vector */
 684         put_bits(&s->pb,
 685                  ff_mpeg12_mbMotionVectorTable[0][1],
 686                  ff_mpeg12_mbMotionVectorTable[0][0]);
 687     } else {
 688         int code, sign, bits;
 689         int bit_size = f_or_b_code - 1;
 690         int range = 1 << bit_size;
 691         /* modulo encoding */
 692         val = sign_extend(val, 5 + bit_size);
 693
 694         if (val >= 0) {
 695             val--;
 696             code = (val >> bit_size) + 1;
 697             bits = val & (range - 1);
 698             sign = 0;
 699         } else {
 700             val = -val;
 701             val--;
 702             code = (val >> bit_size) + 1;
 703             bits = val & (range - 1);
 704             sign = 1;
 705         }
 706
 707         assert(code > 0 && code <= 16);
 708
 709         put_bits(&s->pb,
 710                  ff_mpeg12_mbMotionVectorTable[code][1],
 711                  ff_mpeg12_mbMotionVectorTable[code][0]);
 712
 713         put_bits(&s->pb, 1, sign);
 714         if (bit_size > 0) {
 715             put_bits(&s->pb, bit_size, bits);
 716         }
 717     }
 718 }
 719
 720 void ff_mpeg1_encode_init(MpegEncContext *s)
 721 {
 722     static int done=0;
 723
 724     ff_mpeg12_common_init(s);
 725
 726     if(!done){
 727         int f_code;
 728         int mv;
 729         int i;
 730
 731         done=1;
 732         init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 733         init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 734
 735         for(i=0; i<64; i++)
 736         {
 737                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
 738                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
 739         }
 740
 741         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 742         if(s->intra_vlc_format)
 743             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 744
 745         /* build unified dc encoding tables */
 746         for(i=-255; i<256; i++)
 747         {
 748                 int adiff, index;
 749                 int bits, code;
 750                 int diff=i;
 751
 752                 adiff = FFABS(diff);
 753                 if(diff<0) diff--;
 754                 index = av_log2(2*adiff);
 755
 756                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
 757                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 758                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 759
 760                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 761                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 762                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 763         }
 764
 765         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 766             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 767                 int len;
 768
 769                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
 770                 else{
 771                     int val, bit_size, code;
 772
 773                     bit_size = f_code - 1;
 774
 775                     val=mv;
 776                     if (val < 0)
 777                         val = -val;
 778                     val--;
 779                     code = (val >> bit_size) + 1;
 780                     if(code<17){
 781                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
 782                     }else{
 783                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
 784                     }
 785                 }
 786
 787                 mv_penalty[f_code][mv+MAX_MV]= len;
 788             }
 789         }
 790
 791
 792         for(f_code=MAX_FCODE; f_code>0; f_code--){
 793             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 794                 fcode_tab[mv+MAX_MV]= f_code;
 795             }
 796         }
 797     }
 798     s->me.mv_penalty= mv_penalty;
 799     s->fcode_tab= fcode_tab;
 800     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 801         s->min_qcoeff=-255;
 802         s->max_qcoeff= 255;
 803     }else{
 804         s->min_qcoeff=-2047;
 805         s->max_qcoeff= 2047;
 806     }
 807     if (s->intra_vlc_format) {
 808         s->intra_ac_vlc_length=
 809         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 810     } else {
 811         s->intra_ac_vlc_length=
 812         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 813     }
 814     s->inter_ac_vlc_length=
 815     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 816 }
 817
 818 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 819 {
 820   if(((unsigned) (diff+255)) >= 511){
 821         int index;
 822
 823         if(diff<0){
 824             index= av_log2_16bit(-2*diff);
 825             diff--;
 826         }else{
 827             index= av_log2_16bit(2*diff);
 828         }
 829         if (component == 0) {
 830             put_bits(
 831                 &s->pb,
 832                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
 833                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 834         }else{
 835             put_bits(
 836                 &s->pb,
 837                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 838                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 839         }
 840   }else{
 841     if (component == 0) {
 842         put_bits(
 843             &s->pb,
 844             mpeg1_lum_dc_uni[diff+255]&0xFF,
 845             mpeg1_lum_dc_uni[diff+255]>>8);
 846     } else {
 847         put_bits(
 848             &s->pb,
 849             mpeg1_chr_dc_uni[diff+255]&0xFF,
 850             mpeg1_chr_dc_uni[diff+255]>>8);
 851     }
 852   }
 853 }
 854
 855 static void mpeg1_encode_block(MpegEncContext *s,
 856                                DCTELEM *block,
 857                                int n)
 858 {
 859     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 860     int code, component;
 861     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 862
 863     last_index = s->block_last_index[n];
 864
 865     /* DC coef */
 866     if (s->mb_intra) {
 867         component = (n <= 3 ? 0 : (n&1) + 1);
 868         dc = block[0]; /* overflow is impossible */
 869         diff = dc - s->last_dc[component];
 870         encode_dc(s, diff, component);
 871         s->last_dc[component] = dc;
 872         i = 1;
 873         if (s->intra_vlc_format)
 874             table_vlc = ff_rl_mpeg2.table_vlc;
 875     } else {
 876         /* encode the first coefficient : needs to be done here because
 877            it is handled slightly differently */
 878         level = block[0];
 879         if (abs(level) == 1) {
 880                 code = ((uint32_t)level >> 31); /* the sign bit */
 881                 put_bits(&s->pb, 2, code | 0x02);
 882                 i = 1;
 883         } else {
 884             i = 0;
 885             last_non_zero = -1;
 886             goto next_coef;
 887         }
 888     }
 889
 890     /* now quantify & encode AC coefs */
 891     last_non_zero = i - 1;
 892
 893     for(;i<=last_index;i++) {
 894         j = s->intra_scantable.permutated[i];
 895         level = block[j];
 896     next_coef:
 897         /* encode using VLC */
 898         if (level != 0) {
 899             run = i - last_non_zero - 1;
 900
 901             alevel= level;
 902             MASK_ABS(sign, alevel)
 903             sign&=1;
 904
 905             if (alevel <= mpeg1_max_level[0][run]){
 906                 code= mpeg1_index_run[0][run] + alevel - 1;
 907                 /* store the vlc & sign at once */
 908                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
 909             } else {
 910                 /* escape seems to be pretty rare <5% so I do not optimize it */
 911                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 912                 /* escape: only clip in this case */
 913                 put_bits(&s->pb, 6, run);
 914                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 915                     if (alevel < 128) {
 916                         put_sbits(&s->pb, 8, level);
 917                     } else {
 918                         if (level < 0) {
 919                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 920                         } else {
 921                             put_sbits(&s->pb, 16, level);
 922                         }
 923                     }
 924                 }else{
 925                     put_sbits(&s->pb, 12, level);
 926                 }
 927             }
 928             last_non_zero = i;
 929         }
 930     }
 931     /* end of block */
 932     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 933 }
 934
 935 #define OFFSET(x) offsetof(MpegEncContext, x)
 936 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 937 #define COMMON_OPTS\
 938         {TIMECODE_OPT(MpegEncContext,\
 939          AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)},\
 940     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },\
 941     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE}, \
 942     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 943
 944 static const AVOption mpeg1_options[] = {
 945     COMMON_OPTS
 946     { NULL },
 947 };
 948
 949 static const AVOption mpeg2_options[] = {
 950     COMMON_OPTS
 951     { "non_linear_quant",    "Use nonlinear quantizer.",          OFFSET(q_scale_type),         AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 952     { "alternate_scan",      "Enable alternate scantable.",       OFFSET(alternate_scan),       AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 953     { NULL },
 954 };
 955
 956 #define mpeg12_class(x)\
 957 static const AVClass mpeg## x ##_class = {\
 958     .class_name   = "mpeg" #x "video encoder",\
 959     .item_name    = av_default_item_name,\
 960     .option       = mpeg## x ##_options,\
 961     .version      = LIBAVUTIL_VERSION_INT,\
 962 };
 963
 964 mpeg12_class(1)
 965 mpeg12_class(2)
 966
 967 AVCodec ff_mpeg1video_encoder = {
 968     .name           = "mpeg1video",
 969     .type           = AVMEDIA_TYPE_VIDEO,
 970     .id             = CODEC_ID_MPEG1VIDEO,
 971     .priv_data_size = sizeof(MpegEncContext),
 972     .init           = encode_init,
 973     .encode         = MPV_encode_picture,
 974     .close          = MPV_encode_end,
 975     .supported_framerates= avpriv_frame_rate_tab+1,
 976     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
 977     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 978     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
 979     .priv_class     = &mpeg1_class,
 980 };
 981
 982 AVCodec ff_mpeg2video_encoder = {
 983     .name           = "mpeg2video",
 984     .type           = AVMEDIA_TYPE_VIDEO,
 985     .id             = CODEC_ID_MPEG2VIDEO,
 986     .priv_data_size = sizeof(MpegEncContext),
 987     .init           = encode_init,
 988     .encode         = MPV_encode_picture,
 989     .close          = MPV_encode_end,
 990     .supported_framerates= avpriv_frame_rate_tab+1,
 991     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE},
 992     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 993     .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
 994     .priv_class     = &mpeg2_class,
 995 };