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 Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; 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
  37 #include "libavutil/log.h"
  38 #include "libavutil/opt.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         if (!level)
  78             continue;
  79         for(run=0; run<64; run++){
  80             int len, code;
  81
  82             int alevel= FFABS(level);
  83
  84             if (alevel > rl->max_level[0][run])
  85                 code= 111; /*rl->n*/
  86             else
  87                 code= rl->index_run[0][run] + alevel - 1;
  88
  89             if (code < 111 /* rl->n */) {
  90                 /* length of vlc and sign */
  91                 len=   rl->table_vlc[code][1]+1;
  92             } else {
  93                 len=  rl->table_vlc[111/*rl->n*/][1]+6;
  94
  95                 if (alevel < 128) {
  96                     len += 8;
  97                 } else {
  98                     len += 16;
  99                 }
 100             }
 101
 102             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
 103         }
 104     }
 105 }
 106
 107
 108 static int find_frame_rate_index(MpegEncContext *s){
 109     int i;
 110     int64_t dmin= INT64_MAX;
 111     int64_t d;
 112
 113     for(i=1;i<14;i++) {
 114         int64_t n0= 1001LL/avpriv_frame_rate_tab[i].den*avpriv_frame_rate_tab[i].num*s->avctx->time_base.num;
 115         int64_t n1= 1001LL*s->avctx->time_base.den;
 116         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL && i>=9) break;
 117
 118         d = FFABS(n0 - n1);
 119         if(d < dmin){
 120             dmin=d;
 121             s->frame_rate_index= i;
 122         }
 123     }
 124     if(dmin)
 125         return -1;
 126     else
 127         return 0;
 128 }
 129
 130 static av_cold int encode_init(AVCodecContext *avctx)
 131 {
 132     MpegEncContext *s = avctx->priv_data;
 133
 134     if(ff_MPV_encode_init(avctx) < 0)
 135         return -1;
 136
 137     if(find_frame_rate_index(s) < 0){
 138         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
 139             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
 140             return -1;
 141         }else{
 142             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);
 143         }
 144     }
 145
 146     if(avctx->profile == FF_PROFILE_UNKNOWN){
 147         if(avctx->level != FF_LEVEL_UNKNOWN){
 148             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 149             return -1;
 150         }
 151         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
 152     }
 153
 154     if(avctx->level == FF_LEVEL_UNKNOWN){
 155         if(avctx->profile == 0){ /* 4:2:2 */
 156             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
 157             else                                            avctx->level = 2; /* High */
 158         }else{
 159             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
 160                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 161                 return -1;
 162             }
 163             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
 164             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
 165             else                                            avctx->level = 4; /* High */
 166         }
 167     }
 168
 169     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 170         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 171         return -1;
 172     }
 173
 174     return 0;
 175 }
 176
 177 static void put_header(MpegEncContext *s, int header)
 178 {
 179     avpriv_align_put_bits(&s->pb);
 180     put_bits(&s->pb, 16, header>>16);
 181     put_sbits(&s->pb, 16, header);
 182 }
 183
 184 /* put sequence header if needed */
 185 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 186 {
 187         unsigned int vbv_buffer_size;
 188         unsigned int fps, v;
 189         int i;
 190         uint64_t time_code;
 191         float best_aspect_error= 1E10;
 192         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 193         int constraint_parameter_flag;
 194
 195         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 196
 197         if (s->current_picture.f.key_frame) {
 198             AVRational framerate= avpriv_frame_rate_tab[s->frame_rate_index];
 199
 200             /* mpeg1 header repeated every gop */
 201             put_header(s, SEQ_START_CODE);
 202
 203             put_sbits(&s->pb, 12, s->width );
 204             put_sbits(&s->pb, 12, s->height);
 205
 206             for(i=1; i<15; i++){
 207                 float error= aspect_ratio;
 208                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
 209                     error-= 1.0/ff_mpeg1_aspect[i];
 210                 else
 211                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
 212
 213                 error= FFABS(error);
 214
 215                 if(error < best_aspect_error){
 216                     best_aspect_error= error;
 217                     s->aspect_ratio_info= i;
 218                 }
 219             }
 220
 221             put_bits(&s->pb, 4, s->aspect_ratio_info);
 222             put_bits(&s->pb, 4, s->frame_rate_index);
 223
 224             if(s->avctx->rc_max_rate){
 225                 v = (s->avctx->rc_max_rate + 399) / 400;
 226                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
 227                     v = 0x3ffff;
 228             }else{
 229                 v= 0x3FFFF;
 230             }
 231
 232             if(s->avctx->rc_buffer_size)
 233                 vbv_buffer_size = s->avctx->rc_buffer_size;
 234             else
 235                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 236                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 237             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 238
 239             put_sbits(&s->pb, 18, v);
 240             put_bits(&s->pb, 1, 1); /* marker */
 241             put_sbits(&s->pb, 10, vbv_buffer_size);
 242
 243             constraint_parameter_flag=
 244                 s->width <= 768 && s->height <= 576 &&
 245                 s->mb_width * s->mb_height <= 396 &&
 246                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 247                 framerate.num <= framerate.den*30 &&
 248                 s->avctx->me_range && s->avctx->me_range < 128 &&
 249                 vbv_buffer_size <= 20 &&
 250                 v <= 1856000/400 &&
 251                 s->codec_id == CODEC_ID_MPEG1VIDEO;
 252
 253             put_bits(&s->pb, 1, constraint_parameter_flag);
 254
 255             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 256             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 257
 258             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 259                 put_header(s, EXT_START_CODE);
 260                 put_bits(&s->pb, 4, 1); //seq ext
 261
 262                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 263
 264                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 265                 put_bits(&s->pb, 4, s->avctx->level); //level
 266
 267                 put_bits(&s->pb, 1, s->progressive_sequence);
 268                 put_bits(&s->pb, 2, s->chroma_format);
 269                 put_bits(&s->pb, 2, s->width >>12);
 270                 put_bits(&s->pb, 2, s->height>>12);
 271                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 272                 put_bits(&s->pb, 1, 1); //marker
 273                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 274                 put_bits(&s->pb, 1, s->low_delay);
 275                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
 276                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
 277             }
 278
 279             put_header(s, GOP_START_CODE);
 280             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
 281             /* time code : we must convert from the real frame rate to a
 282                fake mpeg frame rate in case of low frame rate */
 283             fps = (framerate.num + framerate.den/2)/ framerate.den;
 284             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
 285
 286             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 287             if (s->drop_frame_timecode) {
 288                 /* only works for NTSC 29.97 */
 289                 int d = time_code / 17982;
 290                 int m = time_code % 17982;
 291                 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
 292                 time_code += 18 * d + 2 * ((m - 2) / 1798);
 293             }
 294             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 295             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 296             put_bits(&s->pb, 1, 1);
 297             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 298             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 299             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 300             put_bits(&s->pb, 1, 0); /* broken link */
 301         }
 302 }
 303
 304 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 305     while (run >= 33) {
 306         put_bits(&s->pb, 11, 0x008);
 307         run -= 33;
 308     }
 309     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 310              ff_mpeg12_mbAddrIncrTable[run][0]);
 311 }
 312
 313 static av_always_inline void put_qscale(MpegEncContext *s)
 314 {
 315     if(s->q_scale_type){
 316         assert(s->qscale>=1 && s->qscale <=12);
 317         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 318     }else{
 319         put_bits(&s->pb, 5, s->qscale);
 320     }
 321 }
 322
 323 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 324     if (s->height > 2800) {
 325         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 326         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
 327     } else {
 328         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 329     }
 330     put_qscale(s);
 331     put_bits(&s->pb, 1, 0); /* slice extra information */
 332 }
 333
 334 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 335 {
 336     mpeg1_encode_sequence_header(s);
 337
 338     /* mpeg1 picture header */
 339     put_header(s, PICTURE_START_CODE);
 340     /* temporal reference */
 341
 342     // RAL: s->picture_number instead of s->fake_picture_number
 343     put_bits(&s->pb, 10, (s->picture_number -
 344                           s->gop_picture_number) & 0x3ff);
 345     put_bits(&s->pb, 3, s->pict_type);
 346
 347     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 348     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 349
 350     // RAL: Forward f_code also needed for B frames
 351     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 352         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 353         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 354             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 355         else
 356             put_bits(&s->pb, 3, 7); /* forward_f_code */
 357     }
 358
 359     // RAL: Backward f_code necessary for B frames
 360     if (s->pict_type == AV_PICTURE_TYPE_B) {
 361         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 362         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 363             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 364         else
 365             put_bits(&s->pb, 3, 7); /* backward_f_code */
 366     }
 367
 368     put_bits(&s->pb, 1, 0); /* extra bit picture */
 369
 370     s->frame_pred_frame_dct = 1;
 371     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 372         put_header(s, EXT_START_CODE);
 373         put_bits(&s->pb, 4, 8); //pic ext
 374         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 375             put_bits(&s->pb, 4, s->f_code);
 376             put_bits(&s->pb, 4, s->f_code);
 377         }else{
 378             put_bits(&s->pb, 8, 255);
 379         }
 380         if (s->pict_type == AV_PICTURE_TYPE_B) {
 381             put_bits(&s->pb, 4, s->b_code);
 382             put_bits(&s->pb, 4, s->b_code);
 383         }else{
 384             put_bits(&s->pb, 8, 255);
 385         }
 386         put_bits(&s->pb, 2, s->intra_dc_precision);
 387
 388         assert(s->picture_structure == PICT_FRAME);
 389         put_bits(&s->pb, 2, s->picture_structure);
 390         if (s->progressive_sequence) {
 391             put_bits(&s->pb, 1, 0); /* no repeat */
 392         } else {
 393             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 394         }
 395         /* XXX: optimize the generation of this flag with entropy
 396            measures */
 397         s->frame_pred_frame_dct = s->progressive_sequence;
 398
 399         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 400         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 401         put_bits(&s->pb, 1, s->q_scale_type);
 402         put_bits(&s->pb, 1, s->intra_vlc_format);
 403         put_bits(&s->pb, 1, s->alternate_scan);
 404         put_bits(&s->pb, 1, s->repeat_first_field);
 405         s->progressive_frame = s->progressive_sequence;
 406         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 407         put_bits(&s->pb, 1, s->progressive_frame);
 408         put_bits(&s->pb, 1, 0); //composite_display_flag
 409     }
 410     if (s->scan_offset) {
 411         int i;
 412
 413         put_header(s, USER_START_CODE);
 414         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 415             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 416         }
 417     }
 418
 419     s->mb_y=0;
 420     ff_mpeg1_encode_slice_header(s);
 421 }
 422
 423 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 424                                 int has_mv, int field_motion)
 425 {
 426     put_bits(&s->pb, n, bits);
 427     if (!s->frame_pred_frame_dct) {
 428         if (has_mv)
 429             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 430         put_bits(&s->pb, 1, s->interlaced_dct);
 431     }
 432 }
 433
 434 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 435                                                    DCTELEM block[6][64],
 436                                                    int motion_x, int motion_y,
 437                                                    int mb_block_count)
 438 {
 439     int i, cbp;
 440     const int mb_x = s->mb_x;
 441     const int mb_y = s->mb_y;
 442     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 443
 444     /* compute cbp */
 445     cbp = 0;
 446     for(i=0;i<mb_block_count;i++) {
 447         if (s->block_last_index[i] >= 0)
 448             cbp |= 1 << (mb_block_count - 1 - i);
 449     }
 450
 451     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 452         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
 453         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 454         (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) |
 455         ((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))) {
 456         s->mb_skip_run++;
 457         s->qscale -= s->dquant;
 458         s->skip_count++;
 459         s->misc_bits++;
 460         s->last_bits++;
 461         if(s->pict_type == AV_PICTURE_TYPE_P){
 462             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 463             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 464         }
 465     } else {
 466         if(first_mb){
 467             assert(s->mb_skip_run == 0);
 468             encode_mb_skip_run(s, s->mb_x);
 469         }else{
 470             encode_mb_skip_run(s, s->mb_skip_run);
 471         }
 472
 473         if (s->pict_type == AV_PICTURE_TYPE_I) {
 474             if(s->dquant && cbp){
 475                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 476                 put_qscale(s);
 477             }else{
 478                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 479                 s->qscale -= s->dquant;
 480             }
 481             s->misc_bits+= get_bits_diff(s);
 482             s->i_count++;
 483         } else if (s->mb_intra) {
 484             if(s->dquant && cbp){
 485                 put_mb_modes(s, 6, 0x01, 0, 0);
 486                 put_qscale(s);
 487             }else{
 488                 put_mb_modes(s, 5, 0x03, 0, 0);
 489                 s->qscale -= s->dquant;
 490             }
 491             s->misc_bits+= get_bits_diff(s);
 492             s->i_count++;
 493             memset(s->last_mv, 0, sizeof(s->last_mv));
 494         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 495             if(s->mv_type == MV_TYPE_16X16){
 496                 if (cbp != 0) {
 497                     if ((motion_x|motion_y) == 0) {
 498                         if(s->dquant){
 499                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 500                             put_qscale(s);
 501                         }else{
 502                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 503                         }
 504                         s->misc_bits+= get_bits_diff(s);
 505                     } else {
 506                         if(s->dquant){
 507                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 508                             put_qscale(s);
 509                         }else{
 510                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 511                         }
 512                         s->misc_bits+= get_bits_diff(s);
 513                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 514                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 515                         s->mv_bits+= get_bits_diff(s);
 516                     }
 517                 } else {
 518                     put_bits(&s->pb, 3, 1); /* motion only */
 519                     if (!s->frame_pred_frame_dct)
 520                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 521                     s->misc_bits+= get_bits_diff(s);
 522                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 523                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 524                     s->qscale -= s->dquant;
 525                     s->mv_bits+= get_bits_diff(s);
 526                 }
 527                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 528                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 529             }else{
 530                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 531
 532                 if (cbp) {
 533                     if(s->dquant){
 534                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 535                         put_qscale(s);
 536                     }else{
 537                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 538                     }
 539                 } else {
 540                     put_bits(&s->pb, 3, 1); /* motion only */
 541                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 542                     s->qscale -= s->dquant;
 543                 }
 544                 s->misc_bits+= get_bits_diff(s);
 545                 for(i=0; i<2; i++){
 546                     put_bits(&s->pb, 1, s->field_select[0][i]);
 547                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 548                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 549                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 550                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 551                 }
 552                 s->mv_bits+= get_bits_diff(s);
 553             }
 554             if(cbp) {
 555                 if (s->chroma_y_shift) {
 556                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 557                 } else {
 558                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 559                     put_sbits(&s->pb, 2, cbp);
 560                 }
 561             }
 562             s->f_count++;
 563         } else{
 564             if(s->mv_type == MV_TYPE_16X16){
 565                 if (cbp){    // With coded bloc pattern
 566                     if (s->dquant) {
 567                         if(s->mv_dir == MV_DIR_FORWARD)
 568                             put_mb_modes(s, 6, 3, 1, 0);
 569                         else
 570                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
 571                         put_qscale(s);
 572                     } else {
 573                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
 574                     }
 575                 }else{    // No coded bloc pattern
 576                     put_bits(&s->pb, 5-s->mv_dir, 2);
 577                     if (!s->frame_pred_frame_dct)
 578                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 579                     s->qscale -= s->dquant;
 580                 }
 581                 s->misc_bits += get_bits_diff(s);
 582                 if (s->mv_dir&MV_DIR_FORWARD){
 583                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 584                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 585                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 586                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 587                     s->f_count++;
 588                 }
 589                 if (s->mv_dir&MV_DIR_BACKWARD){
 590                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 591                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 592                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 593                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 594                     s->b_count++;
 595                 }
 596             }else{
 597                 assert(s->mv_type == MV_TYPE_FIELD);
 598                 assert(!s->frame_pred_frame_dct);
 599                 if (cbp){    // With coded bloc pattern
 600                     if (s->dquant) {
 601                         if(s->mv_dir == MV_DIR_FORWARD)
 602                             put_mb_modes(s, 6, 3, 1, 1);
 603                         else
 604                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
 605                         put_qscale(s);
 606                     } else {
 607                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
 608                     }
 609                 }else{    // No coded bloc pattern
 610                     put_bits(&s->pb, 5-s->mv_dir, 2);
 611                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 612                     s->qscale -= s->dquant;
 613                 }
 614                 s->misc_bits += get_bits_diff(s);
 615                 if (s->mv_dir&MV_DIR_FORWARD){
 616                     for(i=0; i<2; i++){
 617                         put_bits(&s->pb, 1, s->field_select[0][i]);
 618                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 619                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 620                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 621                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 622                     }
 623                     s->f_count++;
 624                 }
 625                 if (s->mv_dir&MV_DIR_BACKWARD){
 626                     for(i=0; i<2; i++){
 627                         put_bits(&s->pb, 1, s->field_select[1][i]);
 628                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 629                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 630                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 631                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 632                     }
 633                     s->b_count++;
 634                 }
 635             }
 636             s->mv_bits += get_bits_diff(s);
 637             if(cbp) {
 638                 if (s->chroma_y_shift) {
 639                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 640                 } else {
 641                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 642                     put_sbits(&s->pb, 2, cbp);
 643                 }
 644             }
 645         }
 646         for(i=0;i<mb_block_count;i++) {
 647             if (cbp & (1 << (mb_block_count - 1 - i))) {
 648                 mpeg1_encode_block(s, block[i], i);
 649             }
 650         }
 651         s->mb_skip_run = 0;
 652         if(s->mb_intra)
 653             s->i_tex_bits+= get_bits_diff(s);
 654         else
 655             s->p_tex_bits+= get_bits_diff(s);
 656     }
 657 }
 658
 659 void ff_mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
 660 {
 661     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 662     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 663 }
 664
 665 // RAL: Parameter added: f_or_b_code
 666 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 667 {
 668     if (val == 0) {
 669         /* zero vector */
 670         put_bits(&s->pb,
 671                  ff_mpeg12_mbMotionVectorTable[0][1],
 672                  ff_mpeg12_mbMotionVectorTable[0][0]);
 673     } else {
 674         int code, sign, bits;
 675         int bit_size = f_or_b_code - 1;
 676         int range = 1 << bit_size;
 677         /* modulo encoding */
 678         val = sign_extend(val, 5 + bit_size);
 679
 680         if (val >= 0) {
 681             val--;
 682             code = (val >> bit_size) + 1;
 683             bits = val & (range - 1);
 684             sign = 0;
 685         } else {
 686             val = -val;
 687             val--;
 688             code = (val >> bit_size) + 1;
 689             bits = val & (range - 1);
 690             sign = 1;
 691         }
 692
 693         assert(code > 0 && code <= 16);
 694
 695         put_bits(&s->pb,
 696                  ff_mpeg12_mbMotionVectorTable[code][1],
 697                  ff_mpeg12_mbMotionVectorTable[code][0]);
 698
 699         put_bits(&s->pb, 1, sign);
 700         if (bit_size > 0) {
 701             put_bits(&s->pb, bit_size, bits);
 702         }
 703     }
 704 }
 705
 706 void ff_mpeg1_encode_init(MpegEncContext *s)
 707 {
 708     static int done=0;
 709
 710     ff_mpeg12_common_init(s);
 711
 712     if(!done){
 713         int f_code;
 714         int mv;
 715         int i;
 716
 717         done=1;
 718         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 719         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 720
 721         for(i=0; i<64; i++)
 722         {
 723                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
 724                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
 725         }
 726
 727         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 728         if(s->intra_vlc_format)
 729             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 730
 731         /* build unified dc encoding tables */
 732         for(i=-255; i<256; i++)
 733         {
 734                 int adiff, index;
 735                 int bits, code;
 736                 int diff=i;
 737
 738                 adiff = FFABS(diff);
 739                 if(diff<0) diff--;
 740                 index = av_log2(2*adiff);
 741
 742                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
 743                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 744                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 745
 746                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 747                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 748                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 749         }
 750
 751         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 752             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 753                 int len;
 754
 755                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
 756                 else{
 757                     int val, bit_size, code;
 758
 759                     bit_size = f_code - 1;
 760
 761                     val=mv;
 762                     if (val < 0)
 763                         val = -val;
 764                     val--;
 765                     code = (val >> bit_size) + 1;
 766                     if(code<17){
 767                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
 768                     }else{
 769                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
 770                     }
 771                 }
 772
 773                 mv_penalty[f_code][mv+MAX_MV]= len;
 774             }
 775         }
 776
 777
 778         for(f_code=MAX_FCODE; f_code>0; f_code--){
 779             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 780                 fcode_tab[mv+MAX_MV]= f_code;
 781             }
 782         }
 783     }
 784     s->me.mv_penalty= mv_penalty;
 785     s->fcode_tab= fcode_tab;
 786     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 787         s->min_qcoeff=-255;
 788         s->max_qcoeff= 255;
 789     }else{
 790         s->min_qcoeff=-2047;
 791         s->max_qcoeff= 2047;
 792     }
 793     if (s->intra_vlc_format) {
 794         s->intra_ac_vlc_length=
 795         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 796     } else {
 797         s->intra_ac_vlc_length=
 798         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 799     }
 800     s->inter_ac_vlc_length=
 801     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 802 }
 803
 804 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 805 {
 806   if(((unsigned) (diff+255)) >= 511){
 807         int index;
 808
 809         if(diff<0){
 810             index= av_log2_16bit(-2*diff);
 811             diff--;
 812         }else{
 813             index= av_log2_16bit(2*diff);
 814         }
 815         if (component == 0) {
 816             put_bits(
 817                 &s->pb,
 818                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
 819                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 820         }else{
 821             put_bits(
 822                 &s->pb,
 823                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 824                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 825         }
 826   }else{
 827     if (component == 0) {
 828         put_bits(
 829             &s->pb,
 830             mpeg1_lum_dc_uni[diff+255]&0xFF,
 831             mpeg1_lum_dc_uni[diff+255]>>8);
 832     } else {
 833         put_bits(
 834             &s->pb,
 835             mpeg1_chr_dc_uni[diff+255]&0xFF,
 836             mpeg1_chr_dc_uni[diff+255]>>8);
 837     }
 838   }
 839 }
 840
 841 static void mpeg1_encode_block(MpegEncContext *s,
 842                                DCTELEM *block,
 843                                int n)
 844 {
 845     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 846     int code, component;
 847     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 848
 849     last_index = s->block_last_index[n];
 850
 851     /* DC coef */
 852     if (s->mb_intra) {
 853         component = (n <= 3 ? 0 : (n&1) + 1);
 854         dc = block[0]; /* overflow is impossible */
 855         diff = dc - s->last_dc[component];
 856         encode_dc(s, diff, component);
 857         s->last_dc[component] = dc;
 858         i = 1;
 859         if (s->intra_vlc_format)
 860             table_vlc = ff_rl_mpeg2.table_vlc;
 861     } else {
 862         /* encode the first coefficient : needs to be done here because
 863            it is handled slightly differently */
 864         level = block[0];
 865         if (abs(level) == 1) {
 866                 code = ((uint32_t)level >> 31); /* the sign bit */
 867                 put_bits(&s->pb, 2, code | 0x02);
 868                 i = 1;
 869         } else {
 870             i = 0;
 871             last_non_zero = -1;
 872             goto next_coef;
 873         }
 874     }
 875
 876     /* now quantify & encode AC coefs */
 877     last_non_zero = i - 1;
 878
 879     for(;i<=last_index;i++) {
 880         j = s->intra_scantable.permutated[i];
 881         level = block[j];
 882     next_coef:
 883         /* encode using VLC */
 884         if (level != 0) {
 885             run = i - last_non_zero - 1;
 886
 887             alevel= level;
 888             MASK_ABS(sign, alevel)
 889             sign&=1;
 890
 891             if (alevel <= mpeg1_max_level[0][run]){
 892                 code= mpeg1_index_run[0][run] + alevel - 1;
 893                 /* store the vlc & sign at once */
 894                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
 895             } else {
 896                 /* escape seems to be pretty rare <5% so I do not optimize it */
 897                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 898                 /* escape: only clip in this case */
 899                 put_bits(&s->pb, 6, run);
 900                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 901                     if (alevel < 128) {
 902                         put_sbits(&s->pb, 8, level);
 903                     } else {
 904                         if (level < 0) {
 905                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 906                         } else {
 907                             put_sbits(&s->pb, 16, level);
 908                         }
 909                     }
 910                 }else{
 911                     put_sbits(&s->pb, 12, level);
 912                 }
 913             }
 914             last_non_zero = i;
 915         }
 916     }
 917     /* end of block */
 918     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 919 }
 920
 921 #define OFFSET(x) offsetof(MpegEncContext, x)
 922 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 923 #define COMMON_OPTS\
 924     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },\
 925     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE}, \
 926     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 927
 928 static const AVOption mpeg1_options[] = {
 929     COMMON_OPTS
 930     FF_MPV_COMMON_OPTS
 931     { NULL },
 932 };
 933
 934 static const AVOption mpeg2_options[] = {
 935     COMMON_OPTS
 936     { "non_linear_quant",    "Use nonlinear quantizer.",          OFFSET(q_scale_type),         AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 937     { "alternate_scan",      "Enable alternate scantable.",       OFFSET(alternate_scan),       AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 938     FF_MPV_COMMON_OPTS
 939     { NULL },
 940 };
 941
 942 #define mpeg12_class(x)\
 943 static const AVClass mpeg## x ##_class = {\
 944     .class_name   = "mpeg" #x "video encoder",\
 945     .item_name    = av_default_item_name,\
 946     .option       = mpeg## x ##_options,\
 947     .version      = LIBAVUTIL_VERSION_INT,\
 948 };
 949
 950 mpeg12_class(1)
 951 mpeg12_class(2)
 952
 953 AVCodec ff_mpeg1video_encoder = {
 954     .name                 = "mpeg1video",
 955     .type                 = AVMEDIA_TYPE_VIDEO,
 956     .id                   = CODEC_ID_MPEG1VIDEO,
 957     .priv_data_size       = sizeof(MpegEncContext),
 958     .init                 = encode_init,
 959     .encode2              = ff_MPV_encode_picture,
 960     .close                = ff_MPV_encode_end,
 961     .supported_framerates = avpriv_frame_rate_tab+1,
 962     .pix_fmts             = (const enum PixelFormat[]){ PIX_FMT_YUV420P,
 963                                                         PIX_FMT_NONE },
 964     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 965     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
 966     .priv_class           = &mpeg1_class,
 967 };
 968
 969 AVCodec ff_mpeg2video_encoder = {
 970     .name                 = "mpeg2video",
 971     .type                 = AVMEDIA_TYPE_VIDEO,
 972     .id                   = CODEC_ID_MPEG2VIDEO,
 973     .priv_data_size       = sizeof(MpegEncContext),
 974     .init                 = encode_init,
 975     .encode2              = ff_MPV_encode_picture,
 976     .close                = ff_MPV_encode_end,
 977     .supported_framerates = avpriv_frame_rate_tab + 1,
 978     .pix_fmts             = (const enum PixelFormat[]){
 979         PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE
 980     },
 981     .capabilities         = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 982     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
 983     .priv_class           = &mpeg2_class,
 984 };