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, bits, code;
  81
  82             int alevel= FFABS(level);
  83             int sign= (level>>31)&1;
  84
  85             if (alevel > rl->max_level[0][run])
  86                 code= 111; /*rl->n*/
  87             else
  88                 code= rl->index_run[0][run] + alevel - 1;
  89
  90             if (code < 111 /* rl->n */) {
  91                 /* store the vlc & sign at once */
  92                 len=   rl->table_vlc[code][1]+1;
  93                 bits= (rl->table_vlc[code][0]<<1) + sign;
  94             } else {
  95                 len=  rl->table_vlc[111/*rl->n*/][1]+6;
  96                 bits= rl->table_vlc[111/*rl->n*/][0]<<6;
  97
  98                 bits|= run;
  99                 if (alevel < 128) {
 100                     bits<<=8; len+=8;
 101                     bits|= level & 0xff;
 102                 } else {
 103                     bits<<=16; len+=16;
 104                     bits|= level & 0xff;
 105                     if (level < 0) {
 106                         bits|= 0x8001 + level + 255;
 107                     } else {
 108                         bits|= level & 0xffff;
 109                     }
 110                 }
 111             }
 112
 113             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
 114         }
 115     }
 116 }
 117
 118
 119 static int find_frame_rate_index(MpegEncContext *s){
 120     int i;
 121     int64_t dmin= INT64_MAX;
 122     int64_t d;
 123
 124     for(i=1;i<14;i++) {
 125         int64_t n0= 1001LL/avpriv_frame_rate_tab[i].den*avpriv_frame_rate_tab[i].num*s->avctx->time_base.num;
 126         int64_t n1= 1001LL*s->avctx->time_base.den;
 127         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL && i>=9) break;
 128
 129         d = FFABS(n0 - n1);
 130         if(d < dmin){
 131             dmin=d;
 132             s->frame_rate_index= i;
 133         }
 134     }
 135     if(dmin)
 136         return -1;
 137     else
 138         return 0;
 139 }
 140
 141 static av_cold int encode_init(AVCodecContext *avctx)
 142 {
 143     MpegEncContext *s = avctx->priv_data;
 144
 145     if(MPV_encode_init(avctx) < 0)
 146         return -1;
 147
 148 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
 149     if (avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE)
 150         s->drop_frame_timecode = 1;
 151     if (avctx->flags & CODEC_FLAG_SVCD_SCAN_OFFSET)
 152         s->scan_offset = 1;
 153 #endif
 154
 155     if(find_frame_rate_index(s) < 0){
 156         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
 157             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
 158             return -1;
 159         }else{
 160             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);
 161         }
 162     }
 163
 164     if(avctx->profile == FF_PROFILE_UNKNOWN){
 165         if(avctx->level != FF_LEVEL_UNKNOWN){
 166             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 167             return -1;
 168         }
 169         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
 170     }
 171
 172     if(avctx->level == FF_LEVEL_UNKNOWN){
 173         if(avctx->profile == 0){ /* 4:2:2 */
 174             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
 175             else                                            avctx->level = 2; /* High */
 176         }else{
 177             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
 178                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 179                 return -1;
 180             }
 181             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
 182             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
 183             else                                            avctx->level = 4; /* High */
 184         }
 185     }
 186
 187     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 188         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 189         return -1;
 190     }
 191
 192     return 0;
 193 }
 194
 195 static void put_header(MpegEncContext *s, int header)
 196 {
 197     avpriv_align_put_bits(&s->pb);
 198     put_bits(&s->pb, 16, header>>16);
 199     put_sbits(&s->pb, 16, header);
 200 }
 201
 202 /* put sequence header if needed */
 203 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 204 {
 205         unsigned int vbv_buffer_size;
 206         unsigned int fps, v;
 207         int i;
 208         uint64_t time_code;
 209         float best_aspect_error= 1E10;
 210         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 211         int constraint_parameter_flag;
 212
 213         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 214
 215         if (s->current_picture.f.key_frame) {
 216             AVRational framerate= avpriv_frame_rate_tab[s->frame_rate_index];
 217
 218             /* mpeg1 header repeated every gop */
 219             put_header(s, SEQ_START_CODE);
 220
 221             put_sbits(&s->pb, 12, s->width );
 222             put_sbits(&s->pb, 12, s->height);
 223
 224             for(i=1; i<15; i++){
 225                 float error= aspect_ratio;
 226                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
 227                     error-= 1.0/ff_mpeg1_aspect[i];
 228                 else
 229                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
 230
 231                 error= FFABS(error);
 232
 233                 if(error < best_aspect_error){
 234                     best_aspect_error= error;
 235                     s->aspect_ratio_info= i;
 236                 }
 237             }
 238
 239             put_bits(&s->pb, 4, s->aspect_ratio_info);
 240             put_bits(&s->pb, 4, s->frame_rate_index);
 241
 242             if(s->avctx->rc_max_rate){
 243                 v = (s->avctx->rc_max_rate + 399) / 400;
 244                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
 245                     v = 0x3ffff;
 246             }else{
 247                 v= 0x3FFFF;
 248             }
 249
 250             if(s->avctx->rc_buffer_size)
 251                 vbv_buffer_size = s->avctx->rc_buffer_size;
 252             else
 253                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 254                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 255             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 256
 257             put_sbits(&s->pb, 18, v);
 258             put_bits(&s->pb, 1, 1); /* marker */
 259             put_sbits(&s->pb, 10, vbv_buffer_size);
 260
 261             constraint_parameter_flag=
 262                 s->width <= 768 && s->height <= 576 &&
 263                 s->mb_width * s->mb_height <= 396 &&
 264                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 265                 framerate.num <= framerate.den*30 &&
 266                 s->avctx->me_range && s->avctx->me_range < 128 &&
 267                 vbv_buffer_size <= 20 &&
 268                 v <= 1856000/400 &&
 269                 s->codec_id == CODEC_ID_MPEG1VIDEO;
 270
 271             put_bits(&s->pb, 1, constraint_parameter_flag);
 272
 273             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 274             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 275
 276             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 277                 put_header(s, EXT_START_CODE);
 278                 put_bits(&s->pb, 4, 1); //seq ext
 279
 280                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 281
 282                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 283                 put_bits(&s->pb, 4, s->avctx->level); //level
 284
 285                 put_bits(&s->pb, 1, s->progressive_sequence);
 286                 put_bits(&s->pb, 2, s->chroma_format);
 287                 put_bits(&s->pb, 2, s->width >>12);
 288                 put_bits(&s->pb, 2, s->height>>12);
 289                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 290                 put_bits(&s->pb, 1, 1); //marker
 291                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 292                 put_bits(&s->pb, 1, s->low_delay);
 293                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
 294                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
 295             }
 296
 297             put_header(s, GOP_START_CODE);
 298             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
 299             /* time code : we must convert from the real frame rate to a
 300                fake mpeg frame rate in case of low frame rate */
 301             fps = (framerate.num + framerate.den/2)/ framerate.den;
 302             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
 303
 304             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 305             if (s->drop_frame_timecode) {
 306                 /* only works for NTSC 29.97 */
 307                 int d = time_code / 17982;
 308                 int m = time_code % 17982;
 309                 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
 310                 time_code += 18 * d + 2 * ((m - 2) / 1798);
 311             }
 312             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 313             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 314             put_bits(&s->pb, 1, 1);
 315             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 316             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 317             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 318             put_bits(&s->pb, 1, 0); /* broken link */
 319         }
 320 }
 321
 322 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 323     while (run >= 33) {
 324         put_bits(&s->pb, 11, 0x008);
 325         run -= 33;
 326     }
 327     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 328              ff_mpeg12_mbAddrIncrTable[run][0]);
 329 }
 330
 331 static av_always_inline void put_qscale(MpegEncContext *s)
 332 {
 333     if(s->q_scale_type){
 334         assert(s->qscale>=1 && s->qscale <=12);
 335         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 336     }else{
 337         put_bits(&s->pb, 5, s->qscale);
 338     }
 339 }
 340
 341 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 342     if (s->height > 2800) {
 343         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 344         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
 345     } else {
 346         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 347     }
 348     put_qscale(s);
 349     put_bits(&s->pb, 1, 0); /* slice extra information */
 350 }
 351
 352 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 353 {
 354     mpeg1_encode_sequence_header(s);
 355
 356     /* mpeg1 picture header */
 357     put_header(s, PICTURE_START_CODE);
 358     /* temporal reference */
 359
 360     // RAL: s->picture_number instead of s->fake_picture_number
 361     put_bits(&s->pb, 10, (s->picture_number -
 362                           s->gop_picture_number) & 0x3ff);
 363     put_bits(&s->pb, 3, s->pict_type);
 364
 365     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 366     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 367
 368     // RAL: Forward f_code also needed for B frames
 369     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 370         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 371         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 372             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 373         else
 374             put_bits(&s->pb, 3, 7); /* forward_f_code */
 375     }
 376
 377     // RAL: Backward f_code necessary for B frames
 378     if (s->pict_type == AV_PICTURE_TYPE_B) {
 379         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 380         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 381             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 382         else
 383             put_bits(&s->pb, 3, 7); /* backward_f_code */
 384     }
 385
 386     put_bits(&s->pb, 1, 0); /* extra bit picture */
 387
 388     s->frame_pred_frame_dct = 1;
 389     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 390         put_header(s, EXT_START_CODE);
 391         put_bits(&s->pb, 4, 8); //pic ext
 392         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 393             put_bits(&s->pb, 4, s->f_code);
 394             put_bits(&s->pb, 4, s->f_code);
 395         }else{
 396             put_bits(&s->pb, 8, 255);
 397         }
 398         if (s->pict_type == AV_PICTURE_TYPE_B) {
 399             put_bits(&s->pb, 4, s->b_code);
 400             put_bits(&s->pb, 4, s->b_code);
 401         }else{
 402             put_bits(&s->pb, 8, 255);
 403         }
 404         put_bits(&s->pb, 2, s->intra_dc_precision);
 405
 406         assert(s->picture_structure == PICT_FRAME);
 407         put_bits(&s->pb, 2, s->picture_structure);
 408         if (s->progressive_sequence) {
 409             put_bits(&s->pb, 1, 0); /* no repeat */
 410         } else {
 411             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 412         }
 413         /* XXX: optimize the generation of this flag with entropy
 414            measures */
 415         s->frame_pred_frame_dct = s->progressive_sequence;
 416
 417         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 418         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 419         put_bits(&s->pb, 1, s->q_scale_type);
 420         put_bits(&s->pb, 1, s->intra_vlc_format);
 421         put_bits(&s->pb, 1, s->alternate_scan);
 422         put_bits(&s->pb, 1, s->repeat_first_field);
 423         s->progressive_frame = s->progressive_sequence;
 424         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 425         put_bits(&s->pb, 1, s->progressive_frame);
 426         put_bits(&s->pb, 1, 0); //composite_display_flag
 427     }
 428     if (s->scan_offset) {
 429         int i;
 430
 431         put_header(s, USER_START_CODE);
 432         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 433             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 434         }
 435     }
 436
 437     s->mb_y=0;
 438     ff_mpeg1_encode_slice_header(s);
 439 }
 440
 441 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 442                                 int has_mv, int field_motion)
 443 {
 444     put_bits(&s->pb, n, bits);
 445     if (!s->frame_pred_frame_dct) {
 446         if (has_mv)
 447             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 448         put_bits(&s->pb, 1, s->interlaced_dct);
 449     }
 450 }
 451
 452 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 453                                                    DCTELEM block[6][64],
 454                                                    int motion_x, int motion_y,
 455                                                    int mb_block_count)
 456 {
 457     int i, cbp;
 458     const int mb_x = s->mb_x;
 459     const int mb_y = s->mb_y;
 460     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 461
 462     /* compute cbp */
 463     cbp = 0;
 464     for(i=0;i<mb_block_count;i++) {
 465         if (s->block_last_index[i] >= 0)
 466             cbp |= 1 << (mb_block_count - 1 - i);
 467     }
 468
 469     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 470         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
 471         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 472         (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) |
 473         ((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))) {
 474         s->mb_skip_run++;
 475         s->qscale -= s->dquant;
 476         s->skip_count++;
 477         s->misc_bits++;
 478         s->last_bits++;
 479         if(s->pict_type == AV_PICTURE_TYPE_P){
 480             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 481             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 482         }
 483     } else {
 484         if(first_mb){
 485             assert(s->mb_skip_run == 0);
 486             encode_mb_skip_run(s, s->mb_x);
 487         }else{
 488             encode_mb_skip_run(s, s->mb_skip_run);
 489         }
 490
 491         if (s->pict_type == AV_PICTURE_TYPE_I) {
 492             if(s->dquant && cbp){
 493                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 494                 put_qscale(s);
 495             }else{
 496                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 497                 s->qscale -= s->dquant;
 498             }
 499             s->misc_bits+= get_bits_diff(s);
 500             s->i_count++;
 501         } else if (s->mb_intra) {
 502             if(s->dquant && cbp){
 503                 put_mb_modes(s, 6, 0x01, 0, 0);
 504                 put_qscale(s);
 505             }else{
 506                 put_mb_modes(s, 5, 0x03, 0, 0);
 507                 s->qscale -= s->dquant;
 508             }
 509             s->misc_bits+= get_bits_diff(s);
 510             s->i_count++;
 511             memset(s->last_mv, 0, sizeof(s->last_mv));
 512         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 513             if(s->mv_type == MV_TYPE_16X16){
 514                 if (cbp != 0) {
 515                     if ((motion_x|motion_y) == 0) {
 516                         if(s->dquant){
 517                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 518                             put_qscale(s);
 519                         }else{
 520                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 521                         }
 522                         s->misc_bits+= get_bits_diff(s);
 523                     } else {
 524                         if(s->dquant){
 525                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 526                             put_qscale(s);
 527                         }else{
 528                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 529                         }
 530                         s->misc_bits+= get_bits_diff(s);
 531                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 532                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 533                         s->mv_bits+= get_bits_diff(s);
 534                     }
 535                 } else {
 536                     put_bits(&s->pb, 3, 1); /* motion only */
 537                     if (!s->frame_pred_frame_dct)
 538                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 539                     s->misc_bits+= get_bits_diff(s);
 540                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 541                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 542                     s->qscale -= s->dquant;
 543                     s->mv_bits+= get_bits_diff(s);
 544                 }
 545                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 546                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 547             }else{
 548                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 549
 550                 if (cbp) {
 551                     if(s->dquant){
 552                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 553                         put_qscale(s);
 554                     }else{
 555                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 556                     }
 557                 } else {
 558                     put_bits(&s->pb, 3, 1); /* motion only */
 559                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 560                     s->qscale -= s->dquant;
 561                 }
 562                 s->misc_bits+= get_bits_diff(s);
 563                 for(i=0; i<2; i++){
 564                     put_bits(&s->pb, 1, s->field_select[0][i]);
 565                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 566                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 567                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 568                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 569                 }
 570                 s->mv_bits+= get_bits_diff(s);
 571             }
 572             if(cbp) {
 573                 if (s->chroma_y_shift) {
 574                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 575                 } else {
 576                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 577                     put_sbits(&s->pb, 2, cbp);
 578                 }
 579             }
 580             s->f_count++;
 581         } else{
 582             if(s->mv_type == MV_TYPE_16X16){
 583                 if (cbp){    // With coded bloc pattern
 584                     if (s->dquant) {
 585                         if(s->mv_dir == MV_DIR_FORWARD)
 586                             put_mb_modes(s, 6, 3, 1, 0);
 587                         else
 588                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
 589                         put_qscale(s);
 590                     } else {
 591                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
 592                     }
 593                 }else{    // No coded bloc pattern
 594                     put_bits(&s->pb, 5-s->mv_dir, 2);
 595                     if (!s->frame_pred_frame_dct)
 596                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 597                     s->qscale -= s->dquant;
 598                 }
 599                 s->misc_bits += get_bits_diff(s);
 600                 if (s->mv_dir&MV_DIR_FORWARD){
 601                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 602                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 603                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 604                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 605                     s->f_count++;
 606                 }
 607                 if (s->mv_dir&MV_DIR_BACKWARD){
 608                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 609                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 610                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 611                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 612                     s->b_count++;
 613                 }
 614             }else{
 615                 assert(s->mv_type == MV_TYPE_FIELD);
 616                 assert(!s->frame_pred_frame_dct);
 617                 if (cbp){    // With coded bloc pattern
 618                     if (s->dquant) {
 619                         if(s->mv_dir == MV_DIR_FORWARD)
 620                             put_mb_modes(s, 6, 3, 1, 1);
 621                         else
 622                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
 623                         put_qscale(s);
 624                     } else {
 625                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
 626                     }
 627                 }else{    // No coded bloc pattern
 628                     put_bits(&s->pb, 5-s->mv_dir, 2);
 629                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 630                     s->qscale -= s->dquant;
 631                 }
 632                 s->misc_bits += get_bits_diff(s);
 633                 if (s->mv_dir&MV_DIR_FORWARD){
 634                     for(i=0; i<2; i++){
 635                         put_bits(&s->pb, 1, s->field_select[0][i]);
 636                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 637                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 638                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 639                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 640                     }
 641                     s->f_count++;
 642                 }
 643                 if (s->mv_dir&MV_DIR_BACKWARD){
 644                     for(i=0; i<2; i++){
 645                         put_bits(&s->pb, 1, s->field_select[1][i]);
 646                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 647                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 648                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 649                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 650                     }
 651                     s->b_count++;
 652                 }
 653             }
 654             s->mv_bits += get_bits_diff(s);
 655             if(cbp) {
 656                 if (s->chroma_y_shift) {
 657                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 658                 } else {
 659                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 660                     put_sbits(&s->pb, 2, cbp);
 661                 }
 662             }
 663         }
 664         for(i=0;i<mb_block_count;i++) {
 665             if (cbp & (1 << (mb_block_count - 1 - i))) {
 666                 mpeg1_encode_block(s, block[i], i);
 667             }
 668         }
 669         s->mb_skip_run = 0;
 670         if(s->mb_intra)
 671             s->i_tex_bits+= get_bits_diff(s);
 672         else
 673             s->p_tex_bits+= get_bits_diff(s);
 674     }
 675 }
 676
 677 void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
 678 {
 679     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 680     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 681 }
 682
 683 // RAL: Parameter added: f_or_b_code
 684 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 685 {
 686     if (val == 0) {
 687         /* zero vector */
 688         put_bits(&s->pb,
 689                  ff_mpeg12_mbMotionVectorTable[0][1],
 690                  ff_mpeg12_mbMotionVectorTable[0][0]);
 691     } else {
 692         int code, sign, bits;
 693         int bit_size = f_or_b_code - 1;
 694         int range = 1 << bit_size;
 695         /* modulo encoding */
 696         val = sign_extend(val, 5 + bit_size);
 697
 698         if (val >= 0) {
 699             val--;
 700             code = (val >> bit_size) + 1;
 701             bits = val & (range - 1);
 702             sign = 0;
 703         } else {
 704             val = -val;
 705             val--;
 706             code = (val >> bit_size) + 1;
 707             bits = val & (range - 1);
 708             sign = 1;
 709         }
 710
 711         assert(code > 0 && code <= 16);
 712
 713         put_bits(&s->pb,
 714                  ff_mpeg12_mbMotionVectorTable[code][1],
 715                  ff_mpeg12_mbMotionVectorTable[code][0]);
 716
 717         put_bits(&s->pb, 1, sign);
 718         if (bit_size > 0) {
 719             put_bits(&s->pb, bit_size, bits);
 720         }
 721     }
 722 }
 723
 724 void ff_mpeg1_encode_init(MpegEncContext *s)
 725 {
 726     static int done=0;
 727
 728     ff_mpeg12_common_init(s);
 729
 730     if(!done){
 731         int f_code;
 732         int mv;
 733         int i;
 734
 735         done=1;
 736         init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 737         init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 738
 739         for(i=0; i<64; i++)
 740         {
 741                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
 742                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
 743         }
 744
 745         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 746         if(s->intra_vlc_format)
 747             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 748
 749         /* build unified dc encoding tables */
 750         for(i=-255; i<256; i++)
 751         {
 752                 int adiff, index;
 753                 int bits, code;
 754                 int diff=i;
 755
 756                 adiff = FFABS(diff);
 757                 if(diff<0) diff--;
 758                 index = av_log2(2*adiff);
 759
 760                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
 761                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 762                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 763
 764                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 765                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 766                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 767         }
 768
 769         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 770             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 771                 int len;
 772
 773                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
 774                 else{
 775                     int val, bit_size, code;
 776
 777                     bit_size = f_code - 1;
 778
 779                     val=mv;
 780                     if (val < 0)
 781                         val = -val;
 782                     val--;
 783                     code = (val >> bit_size) + 1;
 784                     if(code<17){
 785                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
 786                     }else{
 787                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
 788                     }
 789                 }
 790
 791                 mv_penalty[f_code][mv+MAX_MV]= len;
 792             }
 793         }
 794
 795
 796         for(f_code=MAX_FCODE; f_code>0; f_code--){
 797             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 798                 fcode_tab[mv+MAX_MV]= f_code;
 799             }
 800         }
 801     }
 802     s->me.mv_penalty= mv_penalty;
 803     s->fcode_tab= fcode_tab;
 804     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 805         s->min_qcoeff=-255;
 806         s->max_qcoeff= 255;
 807     }else{
 808         s->min_qcoeff=-2047;
 809         s->max_qcoeff= 2047;
 810     }
 811     if (s->intra_vlc_format) {
 812         s->intra_ac_vlc_length=
 813         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 814     } else {
 815         s->intra_ac_vlc_length=
 816         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 817     }
 818     s->inter_ac_vlc_length=
 819     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 820 }
 821
 822 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 823 {
 824   if(((unsigned) (diff+255)) >= 511){
 825         int index;
 826
 827         if(diff<0){
 828             index= av_log2_16bit(-2*diff);
 829             diff--;
 830         }else{
 831             index= av_log2_16bit(2*diff);
 832         }
 833         if (component == 0) {
 834             put_bits(
 835                 &s->pb,
 836                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
 837                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 838         }else{
 839             put_bits(
 840                 &s->pb,
 841                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 842                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 843         }
 844   }else{
 845     if (component == 0) {
 846         put_bits(
 847             &s->pb,
 848             mpeg1_lum_dc_uni[diff+255]&0xFF,
 849             mpeg1_lum_dc_uni[diff+255]>>8);
 850     } else {
 851         put_bits(
 852             &s->pb,
 853             mpeg1_chr_dc_uni[diff+255]&0xFF,
 854             mpeg1_chr_dc_uni[diff+255]>>8);
 855     }
 856   }
 857 }
 858
 859 static void mpeg1_encode_block(MpegEncContext *s,
 860                                DCTELEM *block,
 861                                int n)
 862 {
 863     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 864     int code, component;
 865     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 866
 867     last_index = s->block_last_index[n];
 868
 869     /* DC coef */
 870     if (s->mb_intra) {
 871         component = (n <= 3 ? 0 : (n&1) + 1);
 872         dc = block[0]; /* overflow is impossible */
 873         diff = dc - s->last_dc[component];
 874         encode_dc(s, diff, component);
 875         s->last_dc[component] = dc;
 876         i = 1;
 877         if (s->intra_vlc_format)
 878             table_vlc = ff_rl_mpeg2.table_vlc;
 879     } else {
 880         /* encode the first coefficient : needs to be done here because
 881            it is handled slightly differently */
 882         level = block[0];
 883         if (abs(level) == 1) {
 884                 code = ((uint32_t)level >> 31); /* the sign bit */
 885                 put_bits(&s->pb, 2, code | 0x02);
 886                 i = 1;
 887         } else {
 888             i = 0;
 889             last_non_zero = -1;
 890             goto next_coef;
 891         }
 892     }
 893
 894     /* now quantify & encode AC coefs */
 895     last_non_zero = i - 1;
 896
 897     for(;i<=last_index;i++) {
 898         j = s->intra_scantable.permutated[i];
 899         level = block[j];
 900     next_coef:
 901         /* encode using VLC */
 902         if (level != 0) {
 903             run = i - last_non_zero - 1;
 904
 905             alevel= level;
 906             MASK_ABS(sign, alevel)
 907             sign&=1;
 908
 909             if (alevel <= mpeg1_max_level[0][run]){
 910                 code= mpeg1_index_run[0][run] + alevel - 1;
 911                 /* store the vlc & sign at once */
 912                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
 913             } else {
 914                 /* escape seems to be pretty rare <5% so I do not optimize it */
 915                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 916                 /* escape: only clip in this case */
 917                 put_bits(&s->pb, 6, run);
 918                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 919                     if (alevel < 128) {
 920                         put_sbits(&s->pb, 8, level);
 921                     } else {
 922                         if (level < 0) {
 923                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 924                         } else {
 925                             put_sbits(&s->pb, 16, level);
 926                         }
 927                     }
 928                 }else{
 929                     put_sbits(&s->pb, 12, level);
 930                 }
 931             }
 932             last_non_zero = i;
 933         }
 934     }
 935     /* end of block */
 936     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 937 }
 938
 939 #define OFFSET(x) offsetof(MpegEncContext, x)
 940 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 941 #define COMMON_OPTS\
 942     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },\
 943     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE}, \
 944     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 945
 946 static const AVOption mpeg1_options[] = {
 947     COMMON_OPTS
 948     { NULL },
 949 };
 950
 951 static const AVOption mpeg2_options[] = {
 952     COMMON_OPTS
 953     { "non_linear_quant",    "Use nonlinear quantizer.",          OFFSET(q_scale_type),         AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 954     { "alternate_scan",      "Enable alternate scantable.",       OFFSET(alternate_scan),       AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 955     { NULL },
 956 };
 957
 958 #define mpeg12_class(x)\
 959 static const AVClass mpeg## x ##_class = {\
 960     .class_name   = "mpeg" #x "video encoder",\
 961     .item_name    = av_default_item_name,\
 962     .option       = mpeg## x ##_options,\
 963     .version      = LIBAVUTIL_VERSION_INT,\
 964 };
 965
 966 mpeg12_class(1)
 967 mpeg12_class(2)
 968
 969 AVCodec ff_mpeg1video_encoder = {
 970     .name           = "mpeg1video",
 971     .type           = AVMEDIA_TYPE_VIDEO,
 972     .id             = CODEC_ID_MPEG1VIDEO,
 973     .priv_data_size = sizeof(MpegEncContext),
 974     .init           = encode_init,
 975     .encode         = MPV_encode_picture,
 976     .close          = MPV_encode_end,
 977     .supported_framerates= avpriv_frame_rate_tab+1,
 978     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
 979     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 980     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
 981     .priv_class     = &mpeg1_class,
 982 };
 983
 984 AVCodec ff_mpeg2video_encoder = {
 985     .name           = "mpeg2video",
 986     .type           = AVMEDIA_TYPE_VIDEO,
 987     .id             = CODEC_ID_MPEG2VIDEO,
 988     .priv_data_size = sizeof(MpegEncContext),
 989     .init           = encode_init,
 990     .encode         = MPV_encode_picture,
 991     .close          = MPV_encode_end,
 992     .supported_framerates= avpriv_frame_rate_tab+1,
 993     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE},
 994     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 995     .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
 996     .priv_class     = &mpeg2_class,
 997 };