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         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/avpriv_frame_rate_tab[i].den*avpriv_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     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 186         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 187         return -1;
 188     }
 189
 190     return 0;
 191 }
 192
 193 static void put_header(MpegEncContext *s, int header)
 194 {
 195     avpriv_align_put_bits(&s->pb);
 196     put_bits(&s->pb, 16, header>>16);
 197     put_sbits(&s->pb, 16, header);
 198 }
 199
 200 /* put sequence header if needed */
 201 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 202 {
 203         unsigned int vbv_buffer_size;
 204         unsigned int fps, v;
 205         int i;
 206         uint64_t time_code;
 207         float best_aspect_error= 1E10;
 208         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 209         int constraint_parameter_flag;
 210
 211         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 212
 213         if (s->current_picture.f.key_frame) {
 214             AVRational framerate= avpriv_frame_rate_tab[s->frame_rate_index];
 215
 216             /* mpeg1 header repeated every gop */
 217             put_header(s, SEQ_START_CODE);
 218
 219             put_sbits(&s->pb, 12, s->width );
 220             put_sbits(&s->pb, 12, s->height);
 221
 222             for(i=1; i<15; i++){
 223                 float error= aspect_ratio;
 224                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
 225                     error-= 1.0/ff_mpeg1_aspect[i];
 226                 else
 227                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
 228
 229                 error= FFABS(error);
 230
 231                 if(error < best_aspect_error){
 232                     best_aspect_error= error;
 233                     s->aspect_ratio_info= i;
 234                 }
 235             }
 236
 237             put_bits(&s->pb, 4, s->aspect_ratio_info);
 238             put_bits(&s->pb, 4, s->frame_rate_index);
 239
 240             if(s->avctx->rc_max_rate){
 241                 v = (s->avctx->rc_max_rate + 399) / 400;
 242                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
 243                     v = 0x3ffff;
 244             }else{
 245                 v= 0x3FFFF;
 246             }
 247
 248             if(s->avctx->rc_buffer_size)
 249                 vbv_buffer_size = s->avctx->rc_buffer_size;
 250             else
 251                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 252                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 253             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 254
 255             put_sbits(&s->pb, 18, v);
 256             put_bits(&s->pb, 1, 1); /* marker */
 257             put_sbits(&s->pb, 10, vbv_buffer_size);
 258
 259             constraint_parameter_flag=
 260                 s->width <= 768 && s->height <= 576 &&
 261                 s->mb_width * s->mb_height <= 396 &&
 262                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 263                 framerate.num <= framerate.den*30 &&
 264                 s->avctx->me_range && s->avctx->me_range < 128 &&
 265                 vbv_buffer_size <= 20 &&
 266                 v <= 1856000/400 &&
 267                 s->codec_id == CODEC_ID_MPEG1VIDEO;
 268
 269             put_bits(&s->pb, 1, constraint_parameter_flag);
 270
 271             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 272             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 273
 274             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 275                 put_header(s, EXT_START_CODE);
 276                 put_bits(&s->pb, 4, 1); //seq ext
 277
 278                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 279
 280                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 281                 put_bits(&s->pb, 4, s->avctx->level); //level
 282
 283                 put_bits(&s->pb, 1, s->progressive_sequence);
 284                 put_bits(&s->pb, 2, s->chroma_format);
 285                 put_bits(&s->pb, 2, s->width >>12);
 286                 put_bits(&s->pb, 2, s->height>>12);
 287                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 288                 put_bits(&s->pb, 1, 1); //marker
 289                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 290                 put_bits(&s->pb, 1, s->low_delay);
 291                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
 292                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
 293             }
 294
 295             put_header(s, GOP_START_CODE);
 296             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
 297             /* time code : we must convert from the real frame rate to a
 298                fake mpeg frame rate in case of low frame rate */
 299             fps = (framerate.num + framerate.den/2)/ framerate.den;
 300             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
 301
 302             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 303             if (s->drop_frame_timecode) {
 304                 /* only works for NTSC 29.97 */
 305                 int d = time_code / 17982;
 306                 int m = time_code % 17982;
 307                 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
 308                 time_code += 18 * d + 2 * ((m - 2) / 1798);
 309             }
 310             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 311             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 312             put_bits(&s->pb, 1, 1);
 313             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 314             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 315             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 316             put_bits(&s->pb, 1, 0); /* broken link */
 317         }
 318 }
 319
 320 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 321     while (run >= 33) {
 322         put_bits(&s->pb, 11, 0x008);
 323         run -= 33;
 324     }
 325     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 326              ff_mpeg12_mbAddrIncrTable[run][0]);
 327 }
 328
 329 static av_always_inline void put_qscale(MpegEncContext *s)
 330 {
 331     if(s->q_scale_type){
 332         assert(s->qscale>=1 && s->qscale <=12);
 333         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 334     }else{
 335         put_bits(&s->pb, 5, s->qscale);
 336     }
 337 }
 338
 339 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 340     if (s->height > 2800) {
 341         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 342         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
 343     } else {
 344         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 345     }
 346     put_qscale(s);
 347     put_bits(&s->pb, 1, 0); /* slice extra information */
 348 }
 349
 350 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 351 {
 352     mpeg1_encode_sequence_header(s);
 353
 354     /* mpeg1 picture header */
 355     put_header(s, PICTURE_START_CODE);
 356     /* temporal reference */
 357
 358     // RAL: s->picture_number instead of s->fake_picture_number
 359     put_bits(&s->pb, 10, (s->picture_number -
 360                           s->gop_picture_number) & 0x3ff);
 361     put_bits(&s->pb, 3, s->pict_type);
 362
 363     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 364     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 365
 366     // RAL: Forward f_code also needed for B frames
 367     if (s->pict_type == AV_PICTURE_TYPE_P || 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->f_code); /* forward_f_code */
 371         else
 372             put_bits(&s->pb, 3, 7); /* forward_f_code */
 373     }
 374
 375     // RAL: Backward f_code necessary for B frames
 376     if (s->pict_type == AV_PICTURE_TYPE_B) {
 377         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 378         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 379             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 380         else
 381             put_bits(&s->pb, 3, 7); /* backward_f_code */
 382     }
 383
 384     put_bits(&s->pb, 1, 0); /* extra bit picture */
 385
 386     s->frame_pred_frame_dct = 1;
 387     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 388         put_header(s, EXT_START_CODE);
 389         put_bits(&s->pb, 4, 8); //pic ext
 390         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 391             put_bits(&s->pb, 4, s->f_code);
 392             put_bits(&s->pb, 4, s->f_code);
 393         }else{
 394             put_bits(&s->pb, 8, 255);
 395         }
 396         if (s->pict_type == AV_PICTURE_TYPE_B) {
 397             put_bits(&s->pb, 4, s->b_code);
 398             put_bits(&s->pb, 4, s->b_code);
 399         }else{
 400             put_bits(&s->pb, 8, 255);
 401         }
 402         put_bits(&s->pb, 2, s->intra_dc_precision);
 403
 404         assert(s->picture_structure == PICT_FRAME);
 405         put_bits(&s->pb, 2, s->picture_structure);
 406         if (s->progressive_sequence) {
 407             put_bits(&s->pb, 1, 0); /* no repeat */
 408         } else {
 409             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 410         }
 411         /* XXX: optimize the generation of this flag with entropy
 412            measures */
 413         s->frame_pred_frame_dct = s->progressive_sequence;
 414
 415         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 416         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 417         put_bits(&s->pb, 1, s->q_scale_type);
 418         put_bits(&s->pb, 1, s->intra_vlc_format);
 419         put_bits(&s->pb, 1, s->alternate_scan);
 420         put_bits(&s->pb, 1, s->repeat_first_field);
 421         s->progressive_frame = s->progressive_sequence;
 422         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 423         put_bits(&s->pb, 1, s->progressive_frame);
 424         put_bits(&s->pb, 1, 0); //composite_display_flag
 425     }
 426     if (s->scan_offset) {
 427         int i;
 428
 429         put_header(s, USER_START_CODE);
 430         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 431             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 432         }
 433     }
 434
 435     s->mb_y=0;
 436     ff_mpeg1_encode_slice_header(s);
 437 }
 438
 439 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 440                                 int has_mv, int field_motion)
 441 {
 442     put_bits(&s->pb, n, bits);
 443     if (!s->frame_pred_frame_dct) {
 444         if (has_mv)
 445             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 446         put_bits(&s->pb, 1, s->interlaced_dct);
 447     }
 448 }
 449
 450 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 451                                                    DCTELEM block[6][64],
 452                                                    int motion_x, int motion_y,
 453                                                    int mb_block_count)
 454 {
 455     int i, cbp;
 456     const int mb_x = s->mb_x;
 457     const int mb_y = s->mb_y;
 458     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 459
 460     /* compute cbp */
 461     cbp = 0;
 462     for(i=0;i<mb_block_count;i++) {
 463         if (s->block_last_index[i] >= 0)
 464             cbp |= 1 << (mb_block_count - 1 - i);
 465     }
 466
 467     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 468         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
 469         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 470         (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) |
 471         ((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))) {
 472         s->mb_skip_run++;
 473         s->qscale -= s->dquant;
 474         s->skip_count++;
 475         s->misc_bits++;
 476         s->last_bits++;
 477         if(s->pict_type == AV_PICTURE_TYPE_P){
 478             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 479             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 480         }
 481     } else {
 482         if(first_mb){
 483             assert(s->mb_skip_run == 0);
 484             encode_mb_skip_run(s, s->mb_x);
 485         }else{
 486             encode_mb_skip_run(s, s->mb_skip_run);
 487         }
 488
 489         if (s->pict_type == AV_PICTURE_TYPE_I) {
 490             if(s->dquant && cbp){
 491                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 492                 put_qscale(s);
 493             }else{
 494                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 495                 s->qscale -= s->dquant;
 496             }
 497             s->misc_bits+= get_bits_diff(s);
 498             s->i_count++;
 499         } else if (s->mb_intra) {
 500             if(s->dquant && cbp){
 501                 put_mb_modes(s, 6, 0x01, 0, 0);
 502                 put_qscale(s);
 503             }else{
 504                 put_mb_modes(s, 5, 0x03, 0, 0);
 505                 s->qscale -= s->dquant;
 506             }
 507             s->misc_bits+= get_bits_diff(s);
 508             s->i_count++;
 509             memset(s->last_mv, 0, sizeof(s->last_mv));
 510         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 511             if(s->mv_type == MV_TYPE_16X16){
 512                 if (cbp != 0) {
 513                     if ((motion_x|motion_y) == 0) {
 514                         if(s->dquant){
 515                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 516                             put_qscale(s);
 517                         }else{
 518                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 519                         }
 520                         s->misc_bits+= get_bits_diff(s);
 521                     } else {
 522                         if(s->dquant){
 523                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 524                             put_qscale(s);
 525                         }else{
 526                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 527                         }
 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->mv_bits+= get_bits_diff(s);
 532                     }
 533                 } else {
 534                     put_bits(&s->pb, 3, 1); /* motion only */
 535                     if (!s->frame_pred_frame_dct)
 536                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 537                     s->misc_bits+= get_bits_diff(s);
 538                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 539                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 540                     s->qscale -= s->dquant;
 541                     s->mv_bits+= get_bits_diff(s);
 542                 }
 543                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 544                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 545             }else{
 546                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 547
 548                 if (cbp) {
 549                     if(s->dquant){
 550                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 551                         put_qscale(s);
 552                     }else{
 553                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 554                     }
 555                 } else {
 556                     put_bits(&s->pb, 3, 1); /* motion only */
 557                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 558                     s->qscale -= s->dquant;
 559                 }
 560                 s->misc_bits+= get_bits_diff(s);
 561                 for(i=0; i<2; i++){
 562                     put_bits(&s->pb, 1, s->field_select[0][i]);
 563                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 564                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 565                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 566                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 567                 }
 568                 s->mv_bits+= get_bits_diff(s);
 569             }
 570             if(cbp) {
 571                 if (s->chroma_y_shift) {
 572                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 573                 } else {
 574                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 575                     put_sbits(&s->pb, 2, cbp);
 576                 }
 577             }
 578             s->f_count++;
 579         } else{
 580             if(s->mv_type == MV_TYPE_16X16){
 581                 if (cbp){    // With coded bloc pattern
 582                     if (s->dquant) {
 583                         if(s->mv_dir == MV_DIR_FORWARD)
 584                             put_mb_modes(s, 6, 3, 1, 0);
 585                         else
 586                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
 587                         put_qscale(s);
 588                     } else {
 589                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
 590                     }
 591                 }else{    // No coded bloc pattern
 592                     put_bits(&s->pb, 5-s->mv_dir, 2);
 593                     if (!s->frame_pred_frame_dct)
 594                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 595                     s->qscale -= s->dquant;
 596                 }
 597                 s->misc_bits += get_bits_diff(s);
 598                 if (s->mv_dir&MV_DIR_FORWARD){
 599                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 600                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 601                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 602                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 603                     s->f_count++;
 604                 }
 605                 if (s->mv_dir&MV_DIR_BACKWARD){
 606                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 607                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 608                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 609                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 610                     s->b_count++;
 611                 }
 612             }else{
 613                 assert(s->mv_type == MV_TYPE_FIELD);
 614                 assert(!s->frame_pred_frame_dct);
 615                 if (cbp){    // With coded bloc pattern
 616                     if (s->dquant) {
 617                         if(s->mv_dir == MV_DIR_FORWARD)
 618                             put_mb_modes(s, 6, 3, 1, 1);
 619                         else
 620                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
 621                         put_qscale(s);
 622                     } else {
 623                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
 624                     }
 625                 }else{    // No coded bloc pattern
 626                     put_bits(&s->pb, 5-s->mv_dir, 2);
 627                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 628                     s->qscale -= s->dquant;
 629                 }
 630                 s->misc_bits += get_bits_diff(s);
 631                 if (s->mv_dir&MV_DIR_FORWARD){
 632                     for(i=0; i<2; i++){
 633                         put_bits(&s->pb, 1, s->field_select[0][i]);
 634                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 635                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 636                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 637                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 638                     }
 639                     s->f_count++;
 640                 }
 641                 if (s->mv_dir&MV_DIR_BACKWARD){
 642                     for(i=0; i<2; i++){
 643                         put_bits(&s->pb, 1, s->field_select[1][i]);
 644                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 645                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 646                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 647                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 648                     }
 649                     s->b_count++;
 650                 }
 651             }
 652             s->mv_bits += get_bits_diff(s);
 653             if(cbp) {
 654                 if (s->chroma_y_shift) {
 655                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 656                 } else {
 657                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 658                     put_sbits(&s->pb, 2, cbp);
 659                 }
 660             }
 661         }
 662         for(i=0;i<mb_block_count;i++) {
 663             if (cbp & (1 << (mb_block_count - 1 - i))) {
 664                 mpeg1_encode_block(s, block[i], i);
 665             }
 666         }
 667         s->mb_skip_run = 0;
 668         if(s->mb_intra)
 669             s->i_tex_bits+= get_bits_diff(s);
 670         else
 671             s->p_tex_bits+= get_bits_diff(s);
 672     }
 673 }
 674
 675 void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
 676 {
 677     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 678     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 679 }
 680
 681 // RAL: Parameter added: f_or_b_code
 682 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 683 {
 684     if (val == 0) {
 685         /* zero vector */
 686         put_bits(&s->pb,
 687                  ff_mpeg12_mbMotionVectorTable[0][1],
 688                  ff_mpeg12_mbMotionVectorTable[0][0]);
 689     } else {
 690         int code, sign, bits;
 691         int bit_size = f_or_b_code - 1;
 692         int range = 1 << bit_size;
 693         /* modulo encoding */
 694         val = sign_extend(val, 5 + bit_size);
 695
 696         if (val >= 0) {
 697             val--;
 698             code = (val >> bit_size) + 1;
 699             bits = val & (range - 1);
 700             sign = 0;
 701         } else {
 702             val = -val;
 703             val--;
 704             code = (val >> bit_size) + 1;
 705             bits = val & (range - 1);
 706             sign = 1;
 707         }
 708
 709         assert(code > 0 && code <= 16);
 710
 711         put_bits(&s->pb,
 712                  ff_mpeg12_mbMotionVectorTable[code][1],
 713                  ff_mpeg12_mbMotionVectorTable[code][0]);
 714
 715         put_bits(&s->pb, 1, sign);
 716         if (bit_size > 0) {
 717             put_bits(&s->pb, bit_size, bits);
 718         }
 719     }
 720 }
 721
 722 void ff_mpeg1_encode_init(MpegEncContext *s)
 723 {
 724     static int done=0;
 725
 726     ff_mpeg12_common_init(s);
 727
 728     if(!done){
 729         int f_code;
 730         int mv;
 731         int i;
 732
 733         done=1;
 734         init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 735         init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 736
 737         for(i=0; i<64; i++)
 738         {
 739                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
 740                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
 741         }
 742
 743         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 744         if(s->intra_vlc_format)
 745             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 746
 747         /* build unified dc encoding tables */
 748         for(i=-255; i<256; i++)
 749         {
 750                 int adiff, index;
 751                 int bits, code;
 752                 int diff=i;
 753
 754                 adiff = FFABS(diff);
 755                 if(diff<0) diff--;
 756                 index = av_log2(2*adiff);
 757
 758                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
 759                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 760                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 761
 762                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 763                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 764                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 765         }
 766
 767         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 768             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 769                 int len;
 770
 771                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
 772                 else{
 773                     int val, bit_size, code;
 774
 775                     bit_size = f_code - 1;
 776
 777                     val=mv;
 778                     if (val < 0)
 779                         val = -val;
 780                     val--;
 781                     code = (val >> bit_size) + 1;
 782                     if(code<17){
 783                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
 784                     }else{
 785                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
 786                     }
 787                 }
 788
 789                 mv_penalty[f_code][mv+MAX_MV]= len;
 790             }
 791         }
 792
 793
 794         for(f_code=MAX_FCODE; f_code>0; f_code--){
 795             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 796                 fcode_tab[mv+MAX_MV]= f_code;
 797             }
 798         }
 799     }
 800     s->me.mv_penalty= mv_penalty;
 801     s->fcode_tab= fcode_tab;
 802     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 803         s->min_qcoeff=-255;
 804         s->max_qcoeff= 255;
 805     }else{
 806         s->min_qcoeff=-2047;
 807         s->max_qcoeff= 2047;
 808     }
 809     if (s->intra_vlc_format) {
 810         s->intra_ac_vlc_length=
 811         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 812     } else {
 813         s->intra_ac_vlc_length=
 814         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 815     }
 816     s->inter_ac_vlc_length=
 817     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 818 }
 819
 820 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 821 {
 822   if(((unsigned) (diff+255)) >= 511){
 823         int index;
 824
 825         if(diff<0){
 826             index= av_log2_16bit(-2*diff);
 827             diff--;
 828         }else{
 829             index= av_log2_16bit(2*diff);
 830         }
 831         if (component == 0) {
 832             put_bits(
 833                 &s->pb,
 834                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
 835                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 836         }else{
 837             put_bits(
 838                 &s->pb,
 839                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 840                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 841         }
 842   }else{
 843     if (component == 0) {
 844         put_bits(
 845             &s->pb,
 846             mpeg1_lum_dc_uni[diff+255]&0xFF,
 847             mpeg1_lum_dc_uni[diff+255]>>8);
 848     } else {
 849         put_bits(
 850             &s->pb,
 851             mpeg1_chr_dc_uni[diff+255]&0xFF,
 852             mpeg1_chr_dc_uni[diff+255]>>8);
 853     }
 854   }
 855 }
 856
 857 static void mpeg1_encode_block(MpegEncContext *s,
 858                                DCTELEM *block,
 859                                int n)
 860 {
 861     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 862     int code, component;
 863     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 864
 865     last_index = s->block_last_index[n];
 866
 867     /* DC coef */
 868     if (s->mb_intra) {
 869         component = (n <= 3 ? 0 : (n&1) + 1);
 870         dc = block[0]; /* overflow is impossible */
 871         diff = dc - s->last_dc[component];
 872         encode_dc(s, diff, component);
 873         s->last_dc[component] = dc;
 874         i = 1;
 875         if (s->intra_vlc_format)
 876             table_vlc = ff_rl_mpeg2.table_vlc;
 877     } else {
 878         /* encode the first coefficient : needs to be done here because
 879            it is handled slightly differently */
 880         level = block[0];
 881         if (abs(level) == 1) {
 882                 code = ((uint32_t)level >> 31); /* the sign bit */
 883                 put_bits(&s->pb, 2, code | 0x02);
 884                 i = 1;
 885         } else {
 886             i = 0;
 887             last_non_zero = -1;
 888             goto next_coef;
 889         }
 890     }
 891
 892     /* now quantify & encode AC coefs */
 893     last_non_zero = i - 1;
 894
 895     for(;i<=last_index;i++) {
 896         j = s->intra_scantable.permutated[i];
 897         level = block[j];
 898     next_coef:
 899         /* encode using VLC */
 900         if (level != 0) {
 901             run = i - last_non_zero - 1;
 902
 903             alevel= level;
 904             MASK_ABS(sign, alevel)
 905             sign&=1;
 906
 907             if (alevel <= mpeg1_max_level[0][run]){
 908                 code= mpeg1_index_run[0][run] + alevel - 1;
 909                 /* store the vlc & sign at once */
 910                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
 911             } else {
 912                 /* escape seems to be pretty rare <5% so I do not optimize it */
 913                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 914                 /* escape: only clip in this case */
 915                 put_bits(&s->pb, 6, run);
 916                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 917                     if (alevel < 128) {
 918                         put_sbits(&s->pb, 8, level);
 919                     } else {
 920                         if (level < 0) {
 921                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 922                         } else {
 923                             put_sbits(&s->pb, 16, level);
 924                         }
 925                     }
 926                 }else{
 927                     put_sbits(&s->pb, 12, level);
 928                 }
 929             }
 930             last_non_zero = i;
 931         }
 932     }
 933     /* end of block */
 934     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 935 }
 936
 937 #define OFFSET(x) offsetof(MpegEncContext, x)
 938 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 939 #define COMMON_OPTS\
 940     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },\
 941     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE}, \
 942     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 943
 944 static const AVOption mpeg1_options[] = {
 945     COMMON_OPTS
 946     { NULL },
 947 };
 948
 949 static const AVOption mpeg2_options[] = {
 950     COMMON_OPTS
 951     { "non_linear_quant",    "Use nonlinear quantizer.",          OFFSET(q_scale_type),         AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 952     { "alternate_scan",      "Enable alternate scantable.",       OFFSET(alternate_scan),       AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 953     { NULL },
 954 };
 955
 956 #define mpeg12_class(x)\
 957 static const AVClass mpeg## x ##_class = {\
 958     .class_name   = "mpeg" #x "video encoder",\
 959     .item_name    = av_default_item_name,\
 960     .option       = mpeg## x ##_options,\
 961     .version      = LIBAVUTIL_VERSION_INT,\
 962 };
 963
 964 mpeg12_class(1)
 965 mpeg12_class(2)
 966
 967 AVCodec ff_mpeg1video_encoder = {
 968     .name           = "mpeg1video",
 969     .type           = AVMEDIA_TYPE_VIDEO,
 970     .id             = CODEC_ID_MPEG1VIDEO,
 971     .priv_data_size = sizeof(MpegEncContext),
 972     .init           = encode_init,
 973     .encode         = MPV_encode_picture,
 974     .close          = MPV_encode_end,
 975     .supported_framerates= avpriv_frame_rate_tab+1,
 976     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
 977     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 978     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
 979     .priv_class     = &mpeg1_class,
 980 };
 981
 982 AVCodec ff_mpeg2video_encoder = {
 983     .name           = "mpeg2video",
 984     .type           = AVMEDIA_TYPE_VIDEO,
 985     .id             = CODEC_ID_MPEG2VIDEO,
 986     .priv_data_size = sizeof(MpegEncContext),
 987     .init           = encode_init,
 988     .encode         = MPV_encode_picture,
 989     .close          = MPV_encode_end,
 990     .supported_framerates= avpriv_frame_rate_tab+1,
 991     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE},
 992     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 993     .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
 994     .priv_class     = &mpeg2_class,
 995 };