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(MPV_encode_init(avctx) < 0)
 135         return -1;
 136
 137 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
 138     if (avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE)
 139         s->drop_frame_timecode = 1;
 140     if (avctx->flags & CODEC_FLAG_SVCD_SCAN_OFFSET)
 141         s->scan_offset = 1;
 142 #endif
 143
 144     if(find_frame_rate_index(s) < 0){
 145         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
 146             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
 147             return -1;
 148         }else{
 149             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);
 150         }
 151     }
 152
 153     if(avctx->profile == FF_PROFILE_UNKNOWN){
 154         if(avctx->level != FF_LEVEL_UNKNOWN){
 155             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 156             return -1;
 157         }
 158         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
 159     }
 160
 161     if(avctx->level == FF_LEVEL_UNKNOWN){
 162         if(avctx->profile == 0){ /* 4:2:2 */
 163             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
 164             else                                            avctx->level = 2; /* High */
 165         }else{
 166             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
 167                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 168                 return -1;
 169             }
 170             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
 171             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
 172             else                                            avctx->level = 4; /* High */
 173         }
 174     }
 175
 176     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 177         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 178         return -1;
 179     }
 180
 181     return 0;
 182 }
 183
 184 static void put_header(MpegEncContext *s, int header)
 185 {
 186     avpriv_align_put_bits(&s->pb);
 187     put_bits(&s->pb, 16, header>>16);
 188     put_sbits(&s->pb, 16, header);
 189 }
 190
 191 /* put sequence header if needed */
 192 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 193 {
 194         unsigned int vbv_buffer_size;
 195         unsigned int fps, v;
 196         int i;
 197         uint64_t time_code;
 198         float best_aspect_error= 1E10;
 199         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 200         int constraint_parameter_flag;
 201
 202         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 203
 204         if (s->current_picture.f.key_frame) {
 205             AVRational framerate= avpriv_frame_rate_tab[s->frame_rate_index];
 206
 207             /* mpeg1 header repeated every gop */
 208             put_header(s, SEQ_START_CODE);
 209
 210             put_sbits(&s->pb, 12, s->width );
 211             put_sbits(&s->pb, 12, s->height);
 212
 213             for(i=1; i<15; i++){
 214                 float error= aspect_ratio;
 215                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
 216                     error-= 1.0/ff_mpeg1_aspect[i];
 217                 else
 218                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
 219
 220                 error= FFABS(error);
 221
 222                 if(error < best_aspect_error){
 223                     best_aspect_error= error;
 224                     s->aspect_ratio_info= i;
 225                 }
 226             }
 227
 228             put_bits(&s->pb, 4, s->aspect_ratio_info);
 229             put_bits(&s->pb, 4, s->frame_rate_index);
 230
 231             if(s->avctx->rc_max_rate){
 232                 v = (s->avctx->rc_max_rate + 399) / 400;
 233                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
 234                     v = 0x3ffff;
 235             }else{
 236                 v= 0x3FFFF;
 237             }
 238
 239             if(s->avctx->rc_buffer_size)
 240                 vbv_buffer_size = s->avctx->rc_buffer_size;
 241             else
 242                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 243                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 244             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 245
 246             put_sbits(&s->pb, 18, v);
 247             put_bits(&s->pb, 1, 1); /* marker */
 248             put_sbits(&s->pb, 10, vbv_buffer_size);
 249
 250             constraint_parameter_flag=
 251                 s->width <= 768 && s->height <= 576 &&
 252                 s->mb_width * s->mb_height <= 396 &&
 253                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 254                 framerate.num <= framerate.den*30 &&
 255                 s->avctx->me_range && s->avctx->me_range < 128 &&
 256                 vbv_buffer_size <= 20 &&
 257                 v <= 1856000/400 &&
 258                 s->codec_id == CODEC_ID_MPEG1VIDEO;
 259
 260             put_bits(&s->pb, 1, constraint_parameter_flag);
 261
 262             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 263             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 264
 265             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 266                 put_header(s, EXT_START_CODE);
 267                 put_bits(&s->pb, 4, 1); //seq ext
 268
 269                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 270
 271                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 272                 put_bits(&s->pb, 4, s->avctx->level); //level
 273
 274                 put_bits(&s->pb, 1, s->progressive_sequence);
 275                 put_bits(&s->pb, 2, s->chroma_format);
 276                 put_bits(&s->pb, 2, s->width >>12);
 277                 put_bits(&s->pb, 2, s->height>>12);
 278                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 279                 put_bits(&s->pb, 1, 1); //marker
 280                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 281                 put_bits(&s->pb, 1, s->low_delay);
 282                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
 283                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
 284             }
 285
 286             put_header(s, GOP_START_CODE);
 287             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
 288             /* time code : we must convert from the real frame rate to a
 289                fake mpeg frame rate in case of low frame rate */
 290             fps = (framerate.num + framerate.den/2)/ framerate.den;
 291             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
 292
 293             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 294             if (s->drop_frame_timecode) {
 295                 /* only works for NTSC 29.97 */
 296                 int d = time_code / 17982;
 297                 int m = time_code % 17982;
 298                 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
 299                 time_code += 18 * d + 2 * ((m - 2) / 1798);
 300             }
 301             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 302             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 303             put_bits(&s->pb, 1, 1);
 304             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 305             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 306             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 307             put_bits(&s->pb, 1, 0); /* broken link */
 308         }
 309 }
 310
 311 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 312     while (run >= 33) {
 313         put_bits(&s->pb, 11, 0x008);
 314         run -= 33;
 315     }
 316     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 317              ff_mpeg12_mbAddrIncrTable[run][0]);
 318 }
 319
 320 static av_always_inline void put_qscale(MpegEncContext *s)
 321 {
 322     if(s->q_scale_type){
 323         assert(s->qscale>=1 && s->qscale <=12);
 324         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 325     }else{
 326         put_bits(&s->pb, 5, s->qscale);
 327     }
 328 }
 329
 330 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 331     if (s->height > 2800) {
 332         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 333         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
 334     } else {
 335         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 336     }
 337     put_qscale(s);
 338     put_bits(&s->pb, 1, 0); /* slice extra information */
 339 }
 340
 341 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 342 {
 343     mpeg1_encode_sequence_header(s);
 344
 345     /* mpeg1 picture header */
 346     put_header(s, PICTURE_START_CODE);
 347     /* temporal reference */
 348
 349     // RAL: s->picture_number instead of s->fake_picture_number
 350     put_bits(&s->pb, 10, (s->picture_number -
 351                           s->gop_picture_number) & 0x3ff);
 352     put_bits(&s->pb, 3, s->pict_type);
 353
 354     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 355     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 356
 357     // RAL: Forward f_code also needed for B frames
 358     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 359         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 360         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 361             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 362         else
 363             put_bits(&s->pb, 3, 7); /* forward_f_code */
 364     }
 365
 366     // RAL: Backward f_code necessary for B frames
 367     if (s->pict_type == AV_PICTURE_TYPE_B) {
 368         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 369         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 370             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 371         else
 372             put_bits(&s->pb, 3, 7); /* backward_f_code */
 373     }
 374
 375     put_bits(&s->pb, 1, 0); /* extra bit picture */
 376
 377     s->frame_pred_frame_dct = 1;
 378     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 379         put_header(s, EXT_START_CODE);
 380         put_bits(&s->pb, 4, 8); //pic ext
 381         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 382             put_bits(&s->pb, 4, s->f_code);
 383             put_bits(&s->pb, 4, s->f_code);
 384         }else{
 385             put_bits(&s->pb, 8, 255);
 386         }
 387         if (s->pict_type == AV_PICTURE_TYPE_B) {
 388             put_bits(&s->pb, 4, s->b_code);
 389             put_bits(&s->pb, 4, s->b_code);
 390         }else{
 391             put_bits(&s->pb, 8, 255);
 392         }
 393         put_bits(&s->pb, 2, s->intra_dc_precision);
 394
 395         assert(s->picture_structure == PICT_FRAME);
 396         put_bits(&s->pb, 2, s->picture_structure);
 397         if (s->progressive_sequence) {
 398             put_bits(&s->pb, 1, 0); /* no repeat */
 399         } else {
 400             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 401         }
 402         /* XXX: optimize the generation of this flag with entropy
 403            measures */
 404         s->frame_pred_frame_dct = s->progressive_sequence;
 405
 406         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 407         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 408         put_bits(&s->pb, 1, s->q_scale_type);
 409         put_bits(&s->pb, 1, s->intra_vlc_format);
 410         put_bits(&s->pb, 1, s->alternate_scan);
 411         put_bits(&s->pb, 1, s->repeat_first_field);
 412         s->progressive_frame = s->progressive_sequence;
 413         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 414         put_bits(&s->pb, 1, s->progressive_frame);
 415         put_bits(&s->pb, 1, 0); //composite_display_flag
 416     }
 417     if (s->scan_offset) {
 418         int i;
 419
 420         put_header(s, USER_START_CODE);
 421         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 422             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 423         }
 424     }
 425
 426     s->mb_y=0;
 427     ff_mpeg1_encode_slice_header(s);
 428 }
 429
 430 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 431                                 int has_mv, int field_motion)
 432 {
 433     put_bits(&s->pb, n, bits);
 434     if (!s->frame_pred_frame_dct) {
 435         if (has_mv)
 436             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 437         put_bits(&s->pb, 1, s->interlaced_dct);
 438     }
 439 }
 440
 441 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 442                                                    DCTELEM block[6][64],
 443                                                    int motion_x, int motion_y,
 444                                                    int mb_block_count)
 445 {
 446     int i, cbp;
 447     const int mb_x = s->mb_x;
 448     const int mb_y = s->mb_y;
 449     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 450
 451     /* compute cbp */
 452     cbp = 0;
 453     for(i=0;i<mb_block_count;i++) {
 454         if (s->block_last_index[i] >= 0)
 455             cbp |= 1 << (mb_block_count - 1 - i);
 456     }
 457
 458     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 459         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
 460         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 461         (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) |
 462         ((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))) {
 463         s->mb_skip_run++;
 464         s->qscale -= s->dquant;
 465         s->skip_count++;
 466         s->misc_bits++;
 467         s->last_bits++;
 468         if(s->pict_type == AV_PICTURE_TYPE_P){
 469             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 470             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 471         }
 472     } else {
 473         if(first_mb){
 474             assert(s->mb_skip_run == 0);
 475             encode_mb_skip_run(s, s->mb_x);
 476         }else{
 477             encode_mb_skip_run(s, s->mb_skip_run);
 478         }
 479
 480         if (s->pict_type == AV_PICTURE_TYPE_I) {
 481             if(s->dquant && cbp){
 482                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 483                 put_qscale(s);
 484             }else{
 485                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 486                 s->qscale -= s->dquant;
 487             }
 488             s->misc_bits+= get_bits_diff(s);
 489             s->i_count++;
 490         } else if (s->mb_intra) {
 491             if(s->dquant && cbp){
 492                 put_mb_modes(s, 6, 0x01, 0, 0);
 493                 put_qscale(s);
 494             }else{
 495                 put_mb_modes(s, 5, 0x03, 0, 0);
 496                 s->qscale -= s->dquant;
 497             }
 498             s->misc_bits+= get_bits_diff(s);
 499             s->i_count++;
 500             memset(s->last_mv, 0, sizeof(s->last_mv));
 501         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 502             if(s->mv_type == MV_TYPE_16X16){
 503                 if (cbp != 0) {
 504                     if ((motion_x|motion_y) == 0) {
 505                         if(s->dquant){
 506                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 507                             put_qscale(s);
 508                         }else{
 509                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 510                         }
 511                         s->misc_bits+= get_bits_diff(s);
 512                     } else {
 513                         if(s->dquant){
 514                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 515                             put_qscale(s);
 516                         }else{
 517                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 518                         }
 519                         s->misc_bits+= get_bits_diff(s);
 520                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 521                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 522                         s->mv_bits+= get_bits_diff(s);
 523                     }
 524                 } else {
 525                     put_bits(&s->pb, 3, 1); /* motion only */
 526                     if (!s->frame_pred_frame_dct)
 527                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 528                     s->misc_bits+= get_bits_diff(s);
 529                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 530                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 531                     s->qscale -= s->dquant;
 532                     s->mv_bits+= get_bits_diff(s);
 533                 }
 534                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 535                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 536             }else{
 537                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 538
 539                 if (cbp) {
 540                     if(s->dquant){
 541                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 542                         put_qscale(s);
 543                     }else{
 544                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 545                     }
 546                 } else {
 547                     put_bits(&s->pb, 3, 1); /* motion only */
 548                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 549                     s->qscale -= s->dquant;
 550                 }
 551                 s->misc_bits+= get_bits_diff(s);
 552                 for(i=0; i<2; i++){
 553                     put_bits(&s->pb, 1, s->field_select[0][i]);
 554                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 555                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 556                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 557                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 558                 }
 559                 s->mv_bits+= get_bits_diff(s);
 560             }
 561             if(cbp) {
 562                 if (s->chroma_y_shift) {
 563                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 564                 } else {
 565                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 566                     put_sbits(&s->pb, 2, cbp);
 567                 }
 568             }
 569             s->f_count++;
 570         } else{
 571             if(s->mv_type == MV_TYPE_16X16){
 572                 if (cbp){    // With coded bloc pattern
 573                     if (s->dquant) {
 574                         if(s->mv_dir == MV_DIR_FORWARD)
 575                             put_mb_modes(s, 6, 3, 1, 0);
 576                         else
 577                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
 578                         put_qscale(s);
 579                     } else {
 580                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
 581                     }
 582                 }else{    // No coded bloc pattern
 583                     put_bits(&s->pb, 5-s->mv_dir, 2);
 584                     if (!s->frame_pred_frame_dct)
 585                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 586                     s->qscale -= s->dquant;
 587                 }
 588                 s->misc_bits += get_bits_diff(s);
 589                 if (s->mv_dir&MV_DIR_FORWARD){
 590                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 591                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 592                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 593                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 594                     s->f_count++;
 595                 }
 596                 if (s->mv_dir&MV_DIR_BACKWARD){
 597                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 598                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 599                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 600                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 601                     s->b_count++;
 602                 }
 603             }else{
 604                 assert(s->mv_type == MV_TYPE_FIELD);
 605                 assert(!s->frame_pred_frame_dct);
 606                 if (cbp){    // With coded bloc pattern
 607                     if (s->dquant) {
 608                         if(s->mv_dir == MV_DIR_FORWARD)
 609                             put_mb_modes(s, 6, 3, 1, 1);
 610                         else
 611                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
 612                         put_qscale(s);
 613                     } else {
 614                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
 615                     }
 616                 }else{    // No coded bloc pattern
 617                     put_bits(&s->pb, 5-s->mv_dir, 2);
 618                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 619                     s->qscale -= s->dquant;
 620                 }
 621                 s->misc_bits += get_bits_diff(s);
 622                 if (s->mv_dir&MV_DIR_FORWARD){
 623                     for(i=0; i<2; i++){
 624                         put_bits(&s->pb, 1, s->field_select[0][i]);
 625                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 626                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 627                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 628                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 629                     }
 630                     s->f_count++;
 631                 }
 632                 if (s->mv_dir&MV_DIR_BACKWARD){
 633                     for(i=0; i<2; i++){
 634                         put_bits(&s->pb, 1, s->field_select[1][i]);
 635                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 636                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 637                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 638                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 639                     }
 640                     s->b_count++;
 641                 }
 642             }
 643             s->mv_bits += get_bits_diff(s);
 644             if(cbp) {
 645                 if (s->chroma_y_shift) {
 646                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 647                 } else {
 648                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 649                     put_sbits(&s->pb, 2, cbp);
 650                 }
 651             }
 652         }
 653         for(i=0;i<mb_block_count;i++) {
 654             if (cbp & (1 << (mb_block_count - 1 - i))) {
 655                 mpeg1_encode_block(s, block[i], i);
 656             }
 657         }
 658         s->mb_skip_run = 0;
 659         if(s->mb_intra)
 660             s->i_tex_bits+= get_bits_diff(s);
 661         else
 662             s->p_tex_bits+= get_bits_diff(s);
 663     }
 664 }
 665
 666 void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
 667 {
 668     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 669     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 670 }
 671
 672 // RAL: Parameter added: f_or_b_code
 673 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 674 {
 675     if (val == 0) {
 676         /* zero vector */
 677         put_bits(&s->pb,
 678                  ff_mpeg12_mbMotionVectorTable[0][1],
 679                  ff_mpeg12_mbMotionVectorTable[0][0]);
 680     } else {
 681         int code, sign, bits;
 682         int bit_size = f_or_b_code - 1;
 683         int range = 1 << bit_size;
 684         /* modulo encoding */
 685         val = sign_extend(val, 5 + bit_size);
 686
 687         if (val >= 0) {
 688             val--;
 689             code = (val >> bit_size) + 1;
 690             bits = val & (range - 1);
 691             sign = 0;
 692         } else {
 693             val = -val;
 694             val--;
 695             code = (val >> bit_size) + 1;
 696             bits = val & (range - 1);
 697             sign = 1;
 698         }
 699
 700         assert(code > 0 && code <= 16);
 701
 702         put_bits(&s->pb,
 703                  ff_mpeg12_mbMotionVectorTable[code][1],
 704                  ff_mpeg12_mbMotionVectorTable[code][0]);
 705
 706         put_bits(&s->pb, 1, sign);
 707         if (bit_size > 0) {
 708             put_bits(&s->pb, bit_size, bits);
 709         }
 710     }
 711 }
 712
 713 void ff_mpeg1_encode_init(MpegEncContext *s)
 714 {
 715     static int done=0;
 716
 717     ff_mpeg12_common_init(s);
 718
 719     if(!done){
 720         int f_code;
 721         int mv;
 722         int i;
 723
 724         done=1;
 725         init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 726         init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 727
 728         for(i=0; i<64; i++)
 729         {
 730                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
 731                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
 732         }
 733
 734         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 735         if(s->intra_vlc_format)
 736             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 737
 738         /* build unified dc encoding tables */
 739         for(i=-255; i<256; i++)
 740         {
 741                 int adiff, index;
 742                 int bits, code;
 743                 int diff=i;
 744
 745                 adiff = FFABS(diff);
 746                 if(diff<0) diff--;
 747                 index = av_log2(2*adiff);
 748
 749                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
 750                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 751                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 752
 753                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 754                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 755                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 756         }
 757
 758         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 759             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 760                 int len;
 761
 762                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
 763                 else{
 764                     int val, bit_size, code;
 765
 766                     bit_size = f_code - 1;
 767
 768                     val=mv;
 769                     if (val < 0)
 770                         val = -val;
 771                     val--;
 772                     code = (val >> bit_size) + 1;
 773                     if(code<17){
 774                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
 775                     }else{
 776                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
 777                     }
 778                 }
 779
 780                 mv_penalty[f_code][mv+MAX_MV]= len;
 781             }
 782         }
 783
 784
 785         for(f_code=MAX_FCODE; f_code>0; f_code--){
 786             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 787                 fcode_tab[mv+MAX_MV]= f_code;
 788             }
 789         }
 790     }
 791     s->me.mv_penalty= mv_penalty;
 792     s->fcode_tab= fcode_tab;
 793     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 794         s->min_qcoeff=-255;
 795         s->max_qcoeff= 255;
 796     }else{
 797         s->min_qcoeff=-2047;
 798         s->max_qcoeff= 2047;
 799     }
 800     if (s->intra_vlc_format) {
 801         s->intra_ac_vlc_length=
 802         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 803     } else {
 804         s->intra_ac_vlc_length=
 805         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 806     }
 807     s->inter_ac_vlc_length=
 808     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 809 }
 810
 811 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 812 {
 813   if(((unsigned) (diff+255)) >= 511){
 814         int index;
 815
 816         if(diff<0){
 817             index= av_log2_16bit(-2*diff);
 818             diff--;
 819         }else{
 820             index= av_log2_16bit(2*diff);
 821         }
 822         if (component == 0) {
 823             put_bits(
 824                 &s->pb,
 825                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
 826                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 827         }else{
 828             put_bits(
 829                 &s->pb,
 830                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 831                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 832         }
 833   }else{
 834     if (component == 0) {
 835         put_bits(
 836             &s->pb,
 837             mpeg1_lum_dc_uni[diff+255]&0xFF,
 838             mpeg1_lum_dc_uni[diff+255]>>8);
 839     } else {
 840         put_bits(
 841             &s->pb,
 842             mpeg1_chr_dc_uni[diff+255]&0xFF,
 843             mpeg1_chr_dc_uni[diff+255]>>8);
 844     }
 845   }
 846 }
 847
 848 static void mpeg1_encode_block(MpegEncContext *s,
 849                                DCTELEM *block,
 850                                int n)
 851 {
 852     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 853     int code, component;
 854     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 855
 856     last_index = s->block_last_index[n];
 857
 858     /* DC coef */
 859     if (s->mb_intra) {
 860         component = (n <= 3 ? 0 : (n&1) + 1);
 861         dc = block[0]; /* overflow is impossible */
 862         diff = dc - s->last_dc[component];
 863         encode_dc(s, diff, component);
 864         s->last_dc[component] = dc;
 865         i = 1;
 866         if (s->intra_vlc_format)
 867             table_vlc = ff_rl_mpeg2.table_vlc;
 868     } else {
 869         /* encode the first coefficient : needs to be done here because
 870            it is handled slightly differently */
 871         level = block[0];
 872         if (abs(level) == 1) {
 873                 code = ((uint32_t)level >> 31); /* the sign bit */
 874                 put_bits(&s->pb, 2, code | 0x02);
 875                 i = 1;
 876         } else {
 877             i = 0;
 878             last_non_zero = -1;
 879             goto next_coef;
 880         }
 881     }
 882
 883     /* now quantify & encode AC coefs */
 884     last_non_zero = i - 1;
 885
 886     for(;i<=last_index;i++) {
 887         j = s->intra_scantable.permutated[i];
 888         level = block[j];
 889     next_coef:
 890         /* encode using VLC */
 891         if (level != 0) {
 892             run = i - last_non_zero - 1;
 893
 894             alevel= level;
 895             MASK_ABS(sign, alevel)
 896             sign&=1;
 897
 898             if (alevel <= mpeg1_max_level[0][run]){
 899                 code= mpeg1_index_run[0][run] + alevel - 1;
 900                 /* store the vlc & sign at once */
 901                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
 902             } else {
 903                 /* escape seems to be pretty rare <5% so I do not optimize it */
 904                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 905                 /* escape: only clip in this case */
 906                 put_bits(&s->pb, 6, run);
 907                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 908                     if (alevel < 128) {
 909                         put_sbits(&s->pb, 8, level);
 910                     } else {
 911                         if (level < 0) {
 912                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 913                         } else {
 914                             put_sbits(&s->pb, 16, level);
 915                         }
 916                     }
 917                 }else{
 918                     put_sbits(&s->pb, 12, level);
 919                 }
 920             }
 921             last_non_zero = i;
 922         }
 923     }
 924     /* end of block */
 925     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 926 }
 927
 928 #define OFFSET(x) offsetof(MpegEncContext, x)
 929 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 930 #define COMMON_OPTS\
 931     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },\
 932     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE}, \
 933     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 934
 935 static const AVOption mpeg1_options[] = {
 936     COMMON_OPTS
 937     { NULL },
 938 };
 939
 940 static const AVOption mpeg2_options[] = {
 941     COMMON_OPTS
 942     { "non_linear_quant",    "Use nonlinear quantizer.",          OFFSET(q_scale_type),         AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 943     { "alternate_scan",      "Enable alternate scantable.",       OFFSET(alternate_scan),       AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 944     { NULL },
 945 };
 946
 947 #define mpeg12_class(x)\
 948 static const AVClass mpeg## x ##_class = {\
 949     .class_name   = "mpeg" #x "video encoder",\
 950     .item_name    = av_default_item_name,\
 951     .option       = mpeg## x ##_options,\
 952     .version      = LIBAVUTIL_VERSION_INT,\
 953 };
 954
 955 mpeg12_class(1)
 956 mpeg12_class(2)
 957
 958 AVCodec ff_mpeg1video_encoder = {
 959     .name           = "mpeg1video",
 960     .type           = AVMEDIA_TYPE_VIDEO,
 961     .id             = CODEC_ID_MPEG1VIDEO,
 962     .priv_data_size = sizeof(MpegEncContext),
 963     .init           = encode_init,
 964     .encode         = MPV_encode_picture,
 965     .close          = MPV_encode_end,
 966     .supported_framerates= avpriv_frame_rate_tab+1,
 967     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
 968     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 969     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
 970     .priv_class     = &mpeg1_class,
 971 };
 972
 973 AVCodec ff_mpeg2video_encoder = {
 974     .name           = "mpeg2video",
 975     .type           = AVMEDIA_TYPE_VIDEO,
 976     .id             = CODEC_ID_MPEG2VIDEO,
 977     .priv_data_size = sizeof(MpegEncContext),
 978     .init           = encode_init,
 979     .encode         = MPV_encode_picture,
 980     .close          = MPV_encode_end,
 981     .supported_framerates= avpriv_frame_rate_tab+1,
 982     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE},
 983     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 984     .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
 985     .priv_class     = &mpeg2_class,
 986 };