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 "mpegvideo.h"
  31
  32 #include "mpeg12.h"
  33 #include "mpeg12data.h"
  34 #include "bytestream.h"
  35 #include "timecode.h"
  36 #include "libavutil/log.h"
  37 #include "libavutil/opt.h"
  38 #include "libavutil/avassert.h"
  39
  40 static const uint8_t inv_non_linear_qscale[13] = {
  41     0, 2, 4, 6, 8,
  42     9,10,11,12,13,14,15,16,
  43 };
  44
  45 static const uint8_t svcd_scan_offset_placeholder[14] = {
  46     0x10, 0x0E,
  47     0x00, 0x80, 0x81,
  48     0x00, 0x80, 0x81,
  49     0xff, 0xff, 0xff,
  50     0xff, 0xff, 0xff,
  51 };
  52
  53 static void mpeg1_encode_block(MpegEncContext *s,
  54                          DCTELEM *block,
  55                          int component);
  56 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
  57
  58 static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
  59 static uint8_t fcode_tab[MAX_MV*2+1];
  60
  61 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
  62 static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
  63
  64 /* simple include everything table for dc, first byte is bits number next 3 are code*/
  65 static uint32_t mpeg1_lum_dc_uni[512];
  66 static uint32_t mpeg1_chr_dc_uni[512];
  67
  68 static uint8_t mpeg1_index_run[2][64];
  69 static int8_t mpeg1_max_level[2][64];
  70
  71 static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
  72     int i;
  73
  74     for(i=0; i<128; i++){
  75         int level= i-64;
  76         int run;
  77         for(run=0; run<64; run++){
  78             int len, bits, code;
  79
  80             int alevel= FFABS(level);
  81             int sign= (level>>31)&1;
  82
  83             if (alevel > rl->max_level[0][run])
  84                 code= 111; /*rl->n*/
  85             else
  86                 code= rl->index_run[0][run] + alevel - 1;
  87
  88             if (code < 111 /* rl->n */) {
  89                 /* store the vlc & sign at once */
  90                 len=   rl->table_vlc[code][1]+1;
  91                 bits= (rl->table_vlc[code][0]<<1) + sign;
  92             } else {
  93                 len=  rl->table_vlc[111/*rl->n*/][1]+6;
  94                 bits= rl->table_vlc[111/*rl->n*/][0]<<6;
  95
  96                 bits|= run;
  97                 if (alevel < 128) {
  98                     bits<<=8; len+=8;
  99                     bits|= level & 0xff;
 100                 } else {
 101                     bits<<=16; len+=16;
 102                     bits|= level & 0xff;
 103                     if (level < 0) {
 104                         bits|= 0x8001 + level + 255;
 105                     } else {
 106                         bits|= level & 0xffff;
 107                     }
 108                 }
 109             }
 110
 111             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
 112         }
 113     }
 114 }
 115
 116
 117 static int find_frame_rate_index(MpegEncContext *s){
 118     int i;
 119     int64_t dmin= INT64_MAX;
 120     int64_t d;
 121
 122     for(i=1;i<14;i++) {
 123         int64_t n0= 1001LL/ff_frame_rate_tab[i].den*ff_frame_rate_tab[i].num*s->avctx->time_base.num;
 124         int64_t n1= 1001LL*s->avctx->time_base.den;
 125         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL && i>=9) break;
 126
 127         d = FFABS(n0 - n1);
 128         if(d < dmin){
 129             dmin=d;
 130             s->frame_rate_index= i;
 131         }
 132     }
 133     if(dmin)
 134         return -1;
 135     else
 136         return 0;
 137 }
 138
 139 static av_cold int encode_init(AVCodecContext *avctx)
 140 {
 141     MpegEncContext *s = avctx->priv_data;
 142
 143     if(MPV_encode_init(avctx) < 0)
 144         return -1;
 145
 146 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
 147     if (avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE)
 148         s->drop_frame_timecode = 1;
 149     if (avctx->flags & CODEC_FLAG_SVCD_SCAN_OFFSET)
 150         s->scan_offset = 1;
 151 #endif
 152
 153     if(find_frame_rate_index(s) < 0){
 154         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
 155             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
 156             return -1;
 157         }else{
 158             av_log(avctx, AV_LOG_INFO, "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n", avctx->time_base.den, avctx->time_base.num);
 159         }
 160     }
 161
 162     if(avctx->profile == FF_PROFILE_UNKNOWN){
 163         if(avctx->level != FF_LEVEL_UNKNOWN){
 164             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 165             return -1;
 166         }
 167         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
 168     }
 169
 170     if(avctx->level == FF_LEVEL_UNKNOWN){
 171         if(avctx->profile == 0){ /* 4:2:2 */
 172             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
 173             else                                            avctx->level = 2; /* High */
 174         }else{
 175             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
 176                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 177                 return -1;
 178             }
 179             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
 180             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
 181             else                                            avctx->level = 4; /* High */
 182         }
 183     }
 184
 185     s->drop_frame_timecode = s->tc.drop = s->drop_frame_timecode || !!(avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE);
 186     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 187         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 188         return -1;
 189     }
 190
 191     if (s->tc.str) {
 192         s->tc.rate = ff_frame_rate_tab[s->frame_rate_index];
 193         if (ff_init_smtpe_timecode(s, &s->tc) < 0)
 194             return -1;
 195         s->avctx->timecode_frame_start = s->tc.start;
 196     }
 197     return 0;
 198 }
 199
 200 static void put_header(MpegEncContext *s, int header)
 201 {
 202     align_put_bits(&s->pb);
 203     put_bits(&s->pb, 16, header>>16);
 204     put_sbits(&s->pb, 16, header);
 205 }
 206
 207 /* put sequence header if needed */
 208 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 209 {
 210         unsigned int vbv_buffer_size;
 211         unsigned int fps, v;
 212         int i;
 213         uint64_t time_code;
 214         float best_aspect_error= 1E10;
 215         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 216         int constraint_parameter_flag;
 217
 218         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 219
 220         if (s->current_picture.f.key_frame) {
 221             AVRational framerate= ff_frame_rate_tab[s->frame_rate_index];
 222
 223             /* mpeg1 header repeated every gop */
 224             put_header(s, SEQ_START_CODE);
 225
 226             put_sbits(&s->pb, 12, s->width );
 227             put_sbits(&s->pb, 12, s->height);
 228
 229             for(i=1; i<15; i++){
 230                 float error= aspect_ratio;
 231                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
 232                     error-= 1.0/ff_mpeg1_aspect[i];
 233                 else
 234                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
 235
 236                 error= FFABS(error);
 237
 238                 if(error < best_aspect_error){
 239                     best_aspect_error= error;
 240                     s->aspect_ratio_info= i;
 241                 }
 242             }
 243
 244             put_bits(&s->pb, 4, s->aspect_ratio_info);
 245             put_bits(&s->pb, 4, s->frame_rate_index);
 246
 247             if(s->avctx->rc_max_rate){
 248                 v = (s->avctx->rc_max_rate + 399) / 400;
 249                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
 250                     v = 0x3ffff;
 251             }else{
 252                 v= 0x3FFFF;
 253             }
 254
 255             if(s->avctx->rc_buffer_size)
 256                 vbv_buffer_size = s->avctx->rc_buffer_size;
 257             else
 258                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 259                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 260             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 261
 262             put_sbits(&s->pb, 18, v);
 263             put_bits(&s->pb, 1, 1); /* marker */
 264             put_sbits(&s->pb, 10, vbv_buffer_size);
 265
 266             constraint_parameter_flag=
 267                 s->width <= 768 && s->height <= 576 &&
 268                 s->mb_width * s->mb_height <= 396 &&
 269                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 270                 framerate.num <= framerate.den*30 &&
 271                 s->avctx->me_range && s->avctx->me_range < 128 &&
 272                 vbv_buffer_size <= 20 &&
 273                 v <= 1856000/400 &&
 274                 s->codec_id == CODEC_ID_MPEG1VIDEO;
 275
 276             put_bits(&s->pb, 1, constraint_parameter_flag);
 277
 278             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 279             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 280
 281             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 282                 put_header(s, EXT_START_CODE);
 283                 put_bits(&s->pb, 4, 1); //seq ext
 284
 285                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 286
 287                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 288                 put_bits(&s->pb, 4, s->avctx->level); //level
 289
 290                 put_bits(&s->pb, 1, s->progressive_sequence);
 291                 put_bits(&s->pb, 2, s->chroma_format);
 292                 put_bits(&s->pb, 2, s->width >>12);
 293                 put_bits(&s->pb, 2, s->height>>12);
 294                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 295                 put_bits(&s->pb, 1, 1); //marker
 296                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 297                 put_bits(&s->pb, 1, s->low_delay);
 298                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
 299                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
 300             }
 301
 302             put_header(s, GOP_START_CODE);
 303             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
 304             /* time code : we must convert from the real frame rate to a
 305                fake mpeg frame rate in case of low frame rate */
 306             fps = (framerate.num + framerate.den/2)/ framerate.den;
 307             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
 308
 309             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 310             av_assert0(s->drop_frame_timecode == s->tc.drop);
 311             if (s->tc.drop)
 312                 time_code = ff_framenum_to_drop_timecode(time_code);
 313             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 314             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 315             put_bits(&s->pb, 1, 1);
 316             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 317             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 318             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 319             put_bits(&s->pb, 1, 0); /* broken link */
 320         }
 321 }
 322
 323 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 324     while (run >= 33) {
 325         put_bits(&s->pb, 11, 0x008);
 326         run -= 33;
 327     }
 328     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 329              ff_mpeg12_mbAddrIncrTable[run][0]);
 330 }
 331
 332 static av_always_inline void put_qscale(MpegEncContext *s)
 333 {
 334     if(s->q_scale_type){
 335         assert(s->qscale>=1 && s->qscale <=12);
 336         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 337     }else{
 338         put_bits(&s->pb, 5, s->qscale);
 339     }
 340 }
 341
 342 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 343     if (s->height > 2800) {
 344         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 345         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
 346     } else {
 347         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 348     }
 349     put_qscale(s);
 350     put_bits(&s->pb, 1, 0); /* slice extra information */
 351 }
 352
 353 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 354 {
 355     mpeg1_encode_sequence_header(s);
 356
 357     /* mpeg1 picture header */
 358     put_header(s, PICTURE_START_CODE);
 359     /* temporal reference */
 360
 361     // RAL: s->picture_number instead of s->fake_picture_number
 362     put_bits(&s->pb, 10, (s->picture_number -
 363                           s->gop_picture_number) & 0x3ff);
 364     put_bits(&s->pb, 3, s->pict_type);
 365
 366     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 367     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 368
 369     // RAL: Forward f_code also needed for B frames
 370     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 371         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 372         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 373             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 374         else
 375             put_bits(&s->pb, 3, 7); /* forward_f_code */
 376     }
 377
 378     // RAL: Backward f_code necessary for B frames
 379     if (s->pict_type == AV_PICTURE_TYPE_B) {
 380         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 381         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 382             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 383         else
 384             put_bits(&s->pb, 3, 7); /* backward_f_code */
 385     }
 386
 387     put_bits(&s->pb, 1, 0); /* extra bit picture */
 388
 389     s->frame_pred_frame_dct = 1;
 390     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 391         put_header(s, EXT_START_CODE);
 392         put_bits(&s->pb, 4, 8); //pic ext
 393         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 394             put_bits(&s->pb, 4, s->f_code);
 395             put_bits(&s->pb, 4, s->f_code);
 396         }else{
 397             put_bits(&s->pb, 8, 255);
 398         }
 399         if (s->pict_type == AV_PICTURE_TYPE_B) {
 400             put_bits(&s->pb, 4, s->b_code);
 401             put_bits(&s->pb, 4, s->b_code);
 402         }else{
 403             put_bits(&s->pb, 8, 255);
 404         }
 405         put_bits(&s->pb, 2, s->intra_dc_precision);
 406
 407         assert(s->picture_structure == PICT_FRAME);
 408         put_bits(&s->pb, 2, s->picture_structure);
 409         if (s->progressive_sequence) {
 410             put_bits(&s->pb, 1, 0); /* no repeat */
 411         } else {
 412             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 413         }
 414         /* XXX: optimize the generation of this flag with entropy
 415            measures */
 416         s->frame_pred_frame_dct = s->progressive_sequence;
 417
 418         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 419         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 420         put_bits(&s->pb, 1, s->q_scale_type);
 421         put_bits(&s->pb, 1, s->intra_vlc_format);
 422         put_bits(&s->pb, 1, s->alternate_scan);
 423         put_bits(&s->pb, 1, s->repeat_first_field);
 424         s->progressive_frame = s->progressive_sequence;
 425         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 426         put_bits(&s->pb, 1, s->progressive_frame);
 427         put_bits(&s->pb, 1, 0); //composite_display_flag
 428     }
 429     if (s->scan_offset) {
 430         int i;
 431
 432         put_header(s, USER_START_CODE);
 433         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 434             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 435         }
 436     }
 437
 438     s->mb_y=0;
 439     ff_mpeg1_encode_slice_header(s);
 440 }
 441
 442 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 443                                 int has_mv, int field_motion)
 444 {
 445     put_bits(&s->pb, n, bits);
 446     if (!s->frame_pred_frame_dct) {
 447         if (has_mv)
 448             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 449         put_bits(&s->pb, 1, s->interlaced_dct);
 450     }
 451 }
 452
 453 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 454                                                    DCTELEM block[6][64],
 455                                                    int motion_x, int motion_y,
 456                                                    int mb_block_count)
 457 {
 458     int i, cbp;
 459     const int mb_x = s->mb_x;
 460     const int mb_y = s->mb_y;
 461     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 462
 463     /* compute cbp */
 464     cbp = 0;
 465     for(i=0;i<mb_block_count;i++) {
 466         if (s->block_last_index[i] >= 0)
 467             cbp |= 1 << (mb_block_count - 1 - i);
 468     }
 469
 470     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 471         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
 472         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 473         (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) |
 474         ((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))) {
 475         s->mb_skip_run++;
 476         s->qscale -= s->dquant;
 477         s->skip_count++;
 478         s->misc_bits++;
 479         s->last_bits++;
 480         if(s->pict_type == AV_PICTURE_TYPE_P){
 481             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 482             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 483         }
 484     } else {
 485         if(first_mb){
 486             assert(s->mb_skip_run == 0);
 487             encode_mb_skip_run(s, s->mb_x);
 488         }else{
 489             encode_mb_skip_run(s, s->mb_skip_run);
 490         }
 491
 492         if (s->pict_type == AV_PICTURE_TYPE_I) {
 493             if(s->dquant && cbp){
 494                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 495                 put_qscale(s);
 496             }else{
 497                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 498                 s->qscale -= s->dquant;
 499             }
 500             s->misc_bits+= get_bits_diff(s);
 501             s->i_count++;
 502         } else if (s->mb_intra) {
 503             if(s->dquant && cbp){
 504                 put_mb_modes(s, 6, 0x01, 0, 0);
 505                 put_qscale(s);
 506             }else{
 507                 put_mb_modes(s, 5, 0x03, 0, 0);
 508                 s->qscale -= s->dquant;
 509             }
 510             s->misc_bits+= get_bits_diff(s);
 511             s->i_count++;
 512             memset(s->last_mv, 0, sizeof(s->last_mv));
 513         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 514             if(s->mv_type == MV_TYPE_16X16){
 515                 if (cbp != 0) {
 516                     if ((motion_x|motion_y) == 0) {
 517                         if(s->dquant){
 518                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 519                             put_qscale(s);
 520                         }else{
 521                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 522                         }
 523                         s->misc_bits+= get_bits_diff(s);
 524                     } else {
 525                         if(s->dquant){
 526                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 527                             put_qscale(s);
 528                         }else{
 529                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 530                         }
 531                         s->misc_bits+= get_bits_diff(s);
 532                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 533                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 534                         s->mv_bits+= get_bits_diff(s);
 535                     }
 536                 } else {
 537                     put_bits(&s->pb, 3, 1); /* motion only */
 538                     if (!s->frame_pred_frame_dct)
 539                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 540                     s->misc_bits+= get_bits_diff(s);
 541                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 542                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 543                     s->qscale -= s->dquant;
 544                     s->mv_bits+= get_bits_diff(s);
 545                 }
 546                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 547                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 548             }else{
 549                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 550
 551                 if (cbp) {
 552                     if(s->dquant){
 553                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 554                         put_qscale(s);
 555                     }else{
 556                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 557                     }
 558                 } else {
 559                     put_bits(&s->pb, 3, 1); /* motion only */
 560                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 561                     s->qscale -= s->dquant;
 562                 }
 563                 s->misc_bits+= get_bits_diff(s);
 564                 for(i=0; i<2; i++){
 565                     put_bits(&s->pb, 1, s->field_select[0][i]);
 566                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 567                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 568                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 569                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 570                 }
 571                 s->mv_bits+= get_bits_diff(s);
 572             }
 573             if(cbp) {
 574                 if (s->chroma_y_shift) {
 575                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 576                 } else {
 577                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 578                     put_sbits(&s->pb, 2, cbp);
 579                 }
 580             }
 581             s->f_count++;
 582         } else{
 583             if(s->mv_type == MV_TYPE_16X16){
 584                 if (cbp){    // With coded bloc pattern
 585                     if (s->dquant) {
 586                         if(s->mv_dir == MV_DIR_FORWARD)
 587                             put_mb_modes(s, 6, 3, 1, 0);
 588                         else
 589                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
 590                         put_qscale(s);
 591                     } else {
 592                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
 593                     }
 594                 }else{    // No coded bloc pattern
 595                     put_bits(&s->pb, 5-s->mv_dir, 2);
 596                     if (!s->frame_pred_frame_dct)
 597                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 598                     s->qscale -= s->dquant;
 599                 }
 600                 s->misc_bits += get_bits_diff(s);
 601                 if (s->mv_dir&MV_DIR_FORWARD){
 602                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 603                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 604                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 605                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 606                     s->f_count++;
 607                 }
 608                 if (s->mv_dir&MV_DIR_BACKWARD){
 609                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 610                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 611                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 612                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 613                     s->b_count++;
 614                 }
 615             }else{
 616                 assert(s->mv_type == MV_TYPE_FIELD);
 617                 assert(!s->frame_pred_frame_dct);
 618                 if (cbp){    // With coded bloc pattern
 619                     if (s->dquant) {
 620                         if(s->mv_dir == MV_DIR_FORWARD)
 621                             put_mb_modes(s, 6, 3, 1, 1);
 622                         else
 623                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
 624                         put_qscale(s);
 625                     } else {
 626                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
 627                     }
 628                 }else{    // No coded bloc pattern
 629                     put_bits(&s->pb, 5-s->mv_dir, 2);
 630                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 631                     s->qscale -= s->dquant;
 632                 }
 633                 s->misc_bits += get_bits_diff(s);
 634                 if (s->mv_dir&MV_DIR_FORWARD){
 635                     for(i=0; i<2; i++){
 636                         put_bits(&s->pb, 1, s->field_select[0][i]);
 637                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 638                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 639                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 640                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 641                     }
 642                     s->f_count++;
 643                 }
 644                 if (s->mv_dir&MV_DIR_BACKWARD){
 645                     for(i=0; i<2; i++){
 646                         put_bits(&s->pb, 1, s->field_select[1][i]);
 647                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 648                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 649                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 650                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 651                     }
 652                     s->b_count++;
 653                 }
 654             }
 655             s->mv_bits += get_bits_diff(s);
 656             if(cbp) {
 657                 if (s->chroma_y_shift) {
 658                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 659                 } else {
 660                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 661                     put_sbits(&s->pb, 2, cbp);
 662                 }
 663             }
 664         }
 665         for(i=0;i<mb_block_count;i++) {
 666             if (cbp & (1 << (mb_block_count - 1 - i))) {
 667                 mpeg1_encode_block(s, block[i], i);
 668             }
 669         }
 670         s->mb_skip_run = 0;
 671         if(s->mb_intra)
 672             s->i_tex_bits+= get_bits_diff(s);
 673         else
 674             s->p_tex_bits+= get_bits_diff(s);
 675     }
 676 }
 677
 678 void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
 679 {
 680     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 681     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 682 }
 683
 684 // RAL: Parameter added: f_or_b_code
 685 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 686 {
 687     if (val == 0) {
 688         /* zero vector */
 689         put_bits(&s->pb,
 690                  ff_mpeg12_mbMotionVectorTable[0][1],
 691                  ff_mpeg12_mbMotionVectorTable[0][0]);
 692     } else {
 693         int code, sign, bits;
 694         int bit_size = f_or_b_code - 1;
 695         int range = 1 << bit_size;
 696         /* modulo encoding */
 697         int l= INT_BIT - 5 - bit_size;
 698         val= (val<<l)>>l;
 699
 700         if (val >= 0) {
 701             val--;
 702             code = (val >> bit_size) + 1;
 703             bits = val & (range - 1);
 704             sign = 0;
 705         } else {
 706             val = -val;
 707             val--;
 708             code = (val >> bit_size) + 1;
 709             bits = val & (range - 1);
 710             sign = 1;
 711         }
 712
 713         assert(code > 0 && code <= 16);
 714
 715         put_bits(&s->pb,
 716                  ff_mpeg12_mbMotionVectorTable[code][1],
 717                  ff_mpeg12_mbMotionVectorTable[code][0]);
 718
 719         put_bits(&s->pb, 1, sign);
 720         if (bit_size > 0) {
 721             put_bits(&s->pb, bit_size, bits);
 722         }
 723     }
 724 }
 725
 726 void ff_mpeg1_encode_init(MpegEncContext *s)
 727 {
 728     static int done=0;
 729
 730     ff_mpeg12_common_init(s);
 731
 732     if(!done){
 733         int f_code;
 734         int mv;
 735         int i;
 736
 737         done=1;
 738         init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 739         init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 740
 741         for(i=0; i<64; i++)
 742         {
 743                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
 744                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
 745         }
 746
 747         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 748         if(s->intra_vlc_format)
 749             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 750
 751         /* build unified dc encoding tables */
 752         for(i=-255; i<256; i++)
 753         {
 754                 int adiff, index;
 755                 int bits, code;
 756                 int diff=i;
 757
 758                 adiff = FFABS(diff);
 759                 if(diff<0) diff--;
 760                 index = av_log2(2*adiff);
 761
 762                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
 763                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 764                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 765
 766                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 767                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 768                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 769         }
 770
 771         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 772             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 773                 int len;
 774
 775                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
 776                 else{
 777                     int val, bit_size, code;
 778
 779                     bit_size = f_code - 1;
 780
 781                     val=mv;
 782                     if (val < 0)
 783                         val = -val;
 784                     val--;
 785                     code = (val >> bit_size) + 1;
 786                     if(code<17){
 787                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
 788                     }else{
 789                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
 790                     }
 791                 }
 792
 793                 mv_penalty[f_code][mv+MAX_MV]= len;
 794             }
 795         }
 796
 797
 798         for(f_code=MAX_FCODE; f_code>0; f_code--){
 799             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 800                 fcode_tab[mv+MAX_MV]= f_code;
 801             }
 802         }
 803     }
 804     s->me.mv_penalty= mv_penalty;
 805     s->fcode_tab= fcode_tab;
 806     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 807         s->min_qcoeff=-255;
 808         s->max_qcoeff= 255;
 809     }else{
 810         s->min_qcoeff=-2047;
 811         s->max_qcoeff= 2047;
 812     }
 813     if (s->intra_vlc_format) {
 814         s->intra_ac_vlc_length=
 815         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 816     } else {
 817         s->intra_ac_vlc_length=
 818         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 819     }
 820     s->inter_ac_vlc_length=
 821     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 822 }
 823
 824 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 825 {
 826   if(((unsigned) (diff+255)) >= 511){
 827         int index;
 828
 829         if(diff<0){
 830             index= av_log2_16bit(-2*diff);
 831             diff--;
 832         }else{
 833             index= av_log2_16bit(2*diff);
 834         }
 835         if (component == 0) {
 836             put_bits(
 837                 &s->pb,
 838                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
 839                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 840         }else{
 841             put_bits(
 842                 &s->pb,
 843                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 844                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 845         }
 846   }else{
 847     if (component == 0) {
 848         put_bits(
 849             &s->pb,
 850             mpeg1_lum_dc_uni[diff+255]&0xFF,
 851             mpeg1_lum_dc_uni[diff+255]>>8);
 852     } else {
 853         put_bits(
 854             &s->pb,
 855             mpeg1_chr_dc_uni[diff+255]&0xFF,
 856             mpeg1_chr_dc_uni[diff+255]>>8);
 857     }
 858   }
 859 }
 860
 861 static void mpeg1_encode_block(MpegEncContext *s,
 862                                DCTELEM *block,
 863                                int n)
 864 {
 865     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 866     int code, component;
 867     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 868
 869     last_index = s->block_last_index[n];
 870
 871     /* DC coef */
 872     if (s->mb_intra) {
 873         component = (n <= 3 ? 0 : (n&1) + 1);
 874         dc = block[0]; /* overflow is impossible */
 875         diff = dc - s->last_dc[component];
 876         encode_dc(s, diff, component);
 877         s->last_dc[component] = dc;
 878         i = 1;
 879         if (s->intra_vlc_format)
 880             table_vlc = ff_rl_mpeg2.table_vlc;
 881     } else {
 882         /* encode the first coefficient : needs to be done here because
 883            it is handled slightly differently */
 884         level = block[0];
 885         if (abs(level) == 1) {
 886                 code = ((uint32_t)level >> 31); /* the sign bit */
 887                 put_bits(&s->pb, 2, code | 0x02);
 888                 i = 1;
 889         } else {
 890             i = 0;
 891             last_non_zero = -1;
 892             goto next_coef;
 893         }
 894     }
 895
 896     /* now quantify & encode AC coefs */
 897     last_non_zero = i - 1;
 898
 899     for(;i<=last_index;i++) {
 900         j = s->intra_scantable.permutated[i];
 901         level = block[j];
 902     next_coef:
 903         /* encode using VLC */
 904         if (level != 0) {
 905             run = i - last_non_zero - 1;
 906
 907             alevel= level;
 908             MASK_ABS(sign, alevel)
 909             sign&=1;
 910
 911             if (alevel <= mpeg1_max_level[0][run]){
 912                 code= mpeg1_index_run[0][run] + alevel - 1;
 913                 /* store the vlc & sign at once */
 914                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
 915             } else {
 916                 /* escape seems to be pretty rare <5% so I do not optimize it */
 917                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 918                 /* escape: only clip in this case */
 919                 put_bits(&s->pb, 6, run);
 920                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 921                     if (alevel < 128) {
 922                         put_sbits(&s->pb, 8, level);
 923                     } else {
 924                         if (level < 0) {
 925                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 926                         } else {
 927                             put_sbits(&s->pb, 16, level);
 928                         }
 929                     }
 930                 }else{
 931                     put_sbits(&s->pb, 12, level);
 932                 }
 933             }
 934             last_non_zero = i;
 935         }
 936     }
 937     /* end of block */
 938     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 939 }
 940
 941 #define OFFSET(x) offsetof(MpegEncContext, x)
 942 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 943 #define COMMON_OPTS\
 944         {TIMECODE_OPT(MpegEncContext,\
 945          AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)},\
 946     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    FF_OPT_TYPE_INT, { 0 }, 0, 1, VE },\
 947     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), FF_OPT_TYPE_INT, { 0 }, 0, 1, VE}, \
 948     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), FF_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 949
 950 static const AVOption mpeg1_options[] = {
 951     COMMON_OPTS
 952     { NULL },
 953 };
 954
 955 static const AVOption mpeg2_options[] = {
 956     COMMON_OPTS
 957     { "non_linear_quant",    "Use nonlinear quantizer.",          OFFSET(q_scale_type),         FF_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 958     { "alternate_scan",      "Enable alternate scantable.",       OFFSET(alternate_scan),       FF_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 959     { NULL },
 960 };
 961
 962 #define mpeg12_class(x)\
 963 static const AVClass mpeg## x ##_class = {\
 964     .class_name   = "mpeg" #x "video encoder",\
 965     .item_name    = av_default_item_name,\
 966     .option       = mpeg## x ##_options,\
 967     .version      = LIBAVUTIL_VERSION_INT,\
 968 };
 969
 970 mpeg12_class(1)
 971 mpeg12_class(2)
 972
 973 AVCodec ff_mpeg1video_encoder = {
 974     .name           = "mpeg1video",
 975     .type           = AVMEDIA_TYPE_VIDEO,
 976     .id             = CODEC_ID_MPEG1VIDEO,
 977     .priv_data_size = sizeof(MpegEncContext),
 978     .init           = encode_init,
 979     .encode         = MPV_encode_picture,
 980     .close          = MPV_encode_end,
 981     .supported_framerates= ff_frame_rate_tab+1,
 982     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
 983     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 984     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
 985     .priv_class     = &mpeg1_class,
 986 };
 987
 988 AVCodec ff_mpeg2video_encoder = {
 989     .name           = "mpeg2video",
 990     .type           = AVMEDIA_TYPE_VIDEO,
 991     .id             = CODEC_ID_MPEG2VIDEO,
 992     .priv_data_size = sizeof(MpegEncContext),
 993     .init           = encode_init,
 994     .encode         = MPV_encode_picture,
 995     .close          = MPV_encode_end,
 996     .supported_framerates= ff_frame_rate_tab+1,
 997     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE},
 998     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 999     .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
1000     .priv_class     = &mpeg2_class,
1001 };