1/* 2 * MPEG1/2 encoder 3 * Copyright (c) 2000,2001 Fabrice Bellard 4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23/** 24 * @file 25 * MPEG1/2 encoder 26 */ 27 28#include "avcodec.h" 29#include "dsputil.h" 30#include "mpegvideo.h" 31 32#include "mpeg12.h" 33#include "mpeg12data.h" 34#include "bytestream.h" 35 36 37static const uint8_t inv_non_linear_qscale[13] = { 38 0, 2, 4, 6, 8, 39 9,10,11,12,13,14,15,16, 40}; 41 42static const uint8_t svcd_scan_offset_placeholder[14] = { 43 0x10, 0x0E, 44 0x00, 0x80, 0x81, 45 0x00, 0x80, 0x81, 46 0xff, 0xff, 0xff, 47 0xff, 0xff, 0xff, 48}; 49 50static void mpeg1_encode_block(MpegEncContext *s, 51 DCTELEM *block, 52 int component); 53static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code); // RAL: f_code parameter added 54 55static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1]; 56static uint8_t fcode_tab[MAX_MV*2+1]; 57 58static uint8_t uni_mpeg1_ac_vlc_len [64*64*2]; 59static uint8_t uni_mpeg2_ac_vlc_len [64*64*2]; 60 61/* simple include everything table for dc, first byte is bits number next 3 are code*/ 62static uint32_t mpeg1_lum_dc_uni[512]; 63static uint32_t mpeg1_chr_dc_uni[512]; 64 65static uint8_t mpeg1_index_run[2][64]; 66static int8_t mpeg1_max_level[2][64]; 67 68static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){ 69 int i; 70 71 for(i=0; i<128; i++){ 72 int level= i-64; 73 int run; 74 for(run=0; run<64; run++){ 75 int len, bits, code; 76 77 int alevel= FFABS(level); 78 int sign= (level>>31)&1; 79 80 if (alevel > rl->max_level[0][run]) 81 code= 111; /*rl->n*/ 82 else 83 code= rl->index_run[0][run] + alevel - 1; 84 85 if (code < 111 /* rl->n */) { 86 /* store the vlc & sign at once */ 87 len= rl->table_vlc[code][1]+1; 88 bits= (rl->table_vlc[code][0]<<1) + sign; 89 } else { 90 len= rl->table_vlc[111/*rl->n*/][1]+6; 91 bits= rl->table_vlc[111/*rl->n*/][0]<<6; 92 93 bits|= run; 94 if (alevel < 128) { 95 bits<<=8; len+=8; 96 bits|= level & 0xff; 97 } else { 98 bits<<=16; len+=16; 99 bits|= level & 0xff; 100 if (level < 0) { 101 bits|= 0x8001 + level + 255; 102 } else { 103 bits|= level & 0xffff; 104 } 105 } 106 } 107 108 uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len; 109 } 110 } 111} 112 113 114static int find_frame_rate_index(MpegEncContext *s){ 115 int i; 116 int64_t dmin= INT64_MAX; 117 int64_t d; 118 119 for(i=1;i<14;i++) { 120 int64_t n0= 1001LL/ff_frame_rate_tab[i].den*ff_frame_rate_tab[i].num*s->avctx->time_base.num; 121 int64_t n1= 1001LL*s->avctx->time_base.den; 122 if(s->avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL && i>=9) break; 123 124 d = FFABS(n0 - n1); 125 if(d < dmin){ 126 dmin=d; 127 s->frame_rate_index= i; 128 } 129 } 130 if(dmin) 131 return -1; 132 else 133 return 0; 134} 135 136static av_cold int encode_init(AVCodecContext *avctx) 137{ 138 MpegEncContext *s = avctx->priv_data; 139 140 if(MPV_encode_init(avctx) < 0) 141 return -1; 142 143 if(find_frame_rate_index(s) < 0){ 144 if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){ 145 av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num); 146 return -1; 147 }else{ 148 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); 149 } 150 } 151 152 if(avctx->profile == FF_PROFILE_UNKNOWN){ 153 if(avctx->level != FF_LEVEL_UNKNOWN){ 154 av_log(avctx, AV_LOG_ERROR, "Set profile and level\n"); 155 return -1; 156 } 157 avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */ 158 } 159 160 if(avctx->level == FF_LEVEL_UNKNOWN){ 161 if(avctx->profile == 0){ /* 4:2:2 */ 162 if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */ 163 else avctx->level = 2; /* High */ 164 }else{ 165 if(avctx->profile != 1 && s->chroma_format != CHROMA_420){ 166 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n"); 167 return -1; 168 } 169 if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */ 170 else if(avctx->width <= 1440) avctx->level = 6; /* High 1440 */ 171 else avctx->level = 4; /* High */ 172 } 173 } 174 175 if((avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) && s->frame_rate_index != 4){ 176 av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n"); 177 return -1; 178 } 179 180 return 0; 181} 182 183static void put_header(MpegEncContext *s, int header) 184{ 185 align_put_bits(&s->pb); 186 put_bits(&s->pb, 16, header>>16); 187 put_sbits(&s->pb, 16, header); 188} 189 190/* put sequence header if needed */ 191static void mpeg1_encode_sequence_header(MpegEncContext *s) 192{ 193 unsigned int vbv_buffer_size; 194 unsigned int fps, v; 195 int i; 196 uint64_t time_code; 197 float best_aspect_error= 1E10; 198 float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio); 199 int constraint_parameter_flag; 200 201 if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA) 202 203 if (s->current_picture.key_frame) { 204 AVRational framerate= ff_frame_rate_tab[s->frame_rate_index]; 205 206 /* mpeg1 header repeated every gop */ 207 put_header(s, SEQ_START_CODE); 208 209 put_sbits(&s->pb, 12, s->width ); 210 put_sbits(&s->pb, 12, s->height); 211 212 for(i=1; i<15; i++){ 213 float error= aspect_ratio; 214 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1) 215 error-= 1.0/ff_mpeg1_aspect[i]; 216 else 217 error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width; 218 219 error= FFABS(error); 220 221 if(error < best_aspect_error){ 222 best_aspect_error= error; 223 s->aspect_ratio_info= i; 224 } 225 } 226 227 put_bits(&s->pb, 4, s->aspect_ratio_info); 228 put_bits(&s->pb, 4, s->frame_rate_index); 229 230 if(s->avctx->rc_max_rate){ 231 v = (s->avctx->rc_max_rate + 399) / 400; 232 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO) 233 v = 0x3ffff; 234 }else{ 235 v= 0x3FFFF; 236 } 237 238 if(s->avctx->rc_buffer_size) 239 vbv_buffer_size = s->avctx->rc_buffer_size; 240 else 241 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */ 242 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024; 243 vbv_buffer_size= (vbv_buffer_size + 16383) / 16384; 244 245 put_sbits(&s->pb, 18, v); 246 put_bits(&s->pb, 1, 1); /* marker */ 247 put_sbits(&s->pb, 10, vbv_buffer_size); 248 249 constraint_parameter_flag= 250 s->width <= 768 && s->height <= 576 && 251 s->mb_width * s->mb_height <= 396 && 252 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 && 253 framerate.num <= framerate.den*30 && 254 s->avctx->me_range && s->avctx->me_range < 128 && 255 vbv_buffer_size <= 20 && 256 v <= 1856000/400 && 257 s->codec_id == CODEC_ID_MPEG1VIDEO; 258 259 put_bits(&s->pb, 1, constraint_parameter_flag); 260 261 ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix); 262 ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix); 263 264 if(s->codec_id == CODEC_ID_MPEG2VIDEO){ 265 put_header(s, EXT_START_CODE); 266 put_bits(&s->pb, 4, 1); //seq ext 267 268 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */ 269 270 put_bits(&s->pb, 3, s->avctx->profile); //profile 271 put_bits(&s->pb, 4, s->avctx->level); //level 272 273 put_bits(&s->pb, 1, s->progressive_sequence); 274 put_bits(&s->pb, 2, s->chroma_format); 275 put_bits(&s->pb, 2, s->width >>12); 276 put_bits(&s->pb, 2, s->height>>12); 277 put_bits(&s->pb, 12, v>>18); //bitrate ext 278 put_bits(&s->pb, 1, 1); //marker 279 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext 280 put_bits(&s->pb, 1, s->low_delay); 281 put_bits(&s->pb, 2, 0); // frame_rate_ext_n 282 put_bits(&s->pb, 5, 0); // frame_rate_ext_d 283 } 284 285 put_header(s, GOP_START_CODE); 286 put_bits(&s->pb, 1, !!(s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE)); /* drop frame flag */ 287 /* time code : we must convert from the real frame rate to a 288 fake mpeg frame rate in case of low frame rate */ 289 fps = (framerate.num + framerate.den/2)/ framerate.den; 290 time_code = s->current_picture_ptr->coded_picture_number + s->avctx->timecode_frame_start; 291 292 s->gop_picture_number = s->current_picture_ptr->coded_picture_number; 293 if (s->avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE) { 294 /* only works for NTSC 29.97 */ 295 int d = time_code / 17982; 296 int m = time_code % 17982; 297 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */ 298 time_code += 18 * d + 2 * ((m - 2) / 1798); 299 } 300 put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24)); 301 put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60)); 302 put_bits(&s->pb, 1, 1); 303 put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60)); 304 put_bits(&s->pb, 6, (uint32_t)((time_code % fps))); 305 put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP)); 306 put_bits(&s->pb, 1, 0); /* broken link */ 307 } 308} 309 310static inline void encode_mb_skip_run(MpegEncContext *s, int run){ 311 while (run >= 33) { 312 put_bits(&s->pb, 11, 0x008); 313 run -= 33; 314 } 315 put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1], 316 ff_mpeg12_mbAddrIncrTable[run][0]); 317} 318 319static av_always_inline void put_qscale(MpegEncContext *s) 320{ 321 if(s->q_scale_type){ 322 assert(s->qscale>=1 && s->qscale <=12); 323 put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]); 324 }else{ 325 put_bits(&s->pb, 5, s->qscale); 326 } 327} 328 329void ff_mpeg1_encode_slice_header(MpegEncContext *s){ 330 if (s->height > 2800) { 331 put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127)); 332 put_bits(&s->pb, 3, s->mb_y >> 7); /* slice_vertical_position_extension */ 333 } else { 334 put_header(s, SLICE_MIN_START_CODE + s->mb_y); 335 } 336 put_qscale(s); 337 put_bits(&s->pb, 1, 0); /* slice extra information */ 338} 339 340void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number) 341{ 342 mpeg1_encode_sequence_header(s); 343 344 /* mpeg1 picture header */ 345 put_header(s, PICTURE_START_CODE); 346 /* temporal reference */ 347 348 // RAL: s->picture_number instead of s->fake_picture_number 349 put_bits(&s->pb, 10, (s->picture_number - 350 s->gop_picture_number) & 0x3ff); 351 put_bits(&s->pb, 3, s->pict_type); 352 353 s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8; 354 put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */ 355 356 // RAL: Forward f_code also needed for B frames 357 if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) { 358 put_bits(&s->pb, 1, 0); /* half pel coordinates */ 359 if(s->codec_id == CODEC_ID_MPEG1VIDEO) 360 put_bits(&s->pb, 3, s->f_code); /* forward_f_code */ 361 else 362 put_bits(&s->pb, 3, 7); /* forward_f_code */ 363 } 364 365 // RAL: Backward f_code necessary for B frames 366 if (s->pict_type == FF_B_TYPE) { 367 put_bits(&s->pb, 1, 0); /* half pel coordinates */ 368 if(s->codec_id == CODEC_ID_MPEG1VIDEO) 369 put_bits(&s->pb, 3, s->b_code); /* backward_f_code */ 370 else 371 put_bits(&s->pb, 3, 7); /* backward_f_code */ 372 } 373 374 put_bits(&s->pb, 1, 0); /* extra bit picture */ 375 376 s->frame_pred_frame_dct = 1; 377 if(s->codec_id == CODEC_ID_MPEG2VIDEO){ 378 put_header(s, EXT_START_CODE); 379 put_bits(&s->pb, 4, 8); //pic ext 380 if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) { 381 put_bits(&s->pb, 4, s->f_code); 382 put_bits(&s->pb, 4, s->f_code); 383 }else{ 384 put_bits(&s->pb, 8, 255); 385 } 386 if (s->pict_type == FF_B_TYPE) { 387 put_bits(&s->pb, 4, s->b_code); 388 put_bits(&s->pb, 4, s->b_code); 389 }else{ 390 put_bits(&s->pb, 8, 255); 391 } 392 put_bits(&s->pb, 2, s->intra_dc_precision); 393 394 assert(s->picture_structure == PICT_FRAME); 395 put_bits(&s->pb, 2, s->picture_structure); 396 if (s->progressive_sequence) { 397 put_bits(&s->pb, 1, 0); /* no repeat */ 398 } else { 399 put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first); 400 } 401 /* XXX: optimize the generation of this flag with entropy 402 measures */ 403 s->frame_pred_frame_dct = s->progressive_sequence; 404 405 put_bits(&s->pb, 1, s->frame_pred_frame_dct); 406 put_bits(&s->pb, 1, s->concealment_motion_vectors); 407 put_bits(&s->pb, 1, s->q_scale_type); 408 put_bits(&s->pb, 1, s->intra_vlc_format); 409 put_bits(&s->pb, 1, s->alternate_scan); 410 put_bits(&s->pb, 1, s->repeat_first_field); 411 s->progressive_frame = s->progressive_sequence; 412 put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */ 413 put_bits(&s->pb, 1, s->progressive_frame); 414 put_bits(&s->pb, 1, 0); //composite_display_flag 415 } 416 if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){ 417 int i; 418 419 put_header(s, USER_START_CODE); 420 for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){ 421 put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]); 422 } 423 } 424 425 s->mb_y=0; 426 ff_mpeg1_encode_slice_header(s); 427} 428 429static inline void put_mb_modes(MpegEncContext *s, int n, int bits, 430 int has_mv, int field_motion) 431{ 432 put_bits(&s->pb, n, bits); 433 if (!s->frame_pred_frame_dct) { 434 if (has_mv) 435 put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */ 436 put_bits(&s->pb, 1, s->interlaced_dct); 437 } 438} 439 440static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s, 441 DCTELEM block[6][64], 442 int motion_x, int motion_y, 443 int mb_block_count) 444{ 445 int i, cbp; 446 const int mb_x = s->mb_x; 447 const int mb_y = s->mb_y; 448 const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y; 449 450 /* compute cbp */ 451 cbp = 0; 452 for(i=0;i<mb_block_count;i++) { 453 if (s->block_last_index[i] >= 0) 454 cbp |= 1 << (mb_block_count - 1 - i); 455 } 456 457 if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 && 458 (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) && 459 ((s->pict_type == FF_P_TYPE && (motion_x | motion_y) == 0) || 460 (s->pict_type == FF_B_TYPE && 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) | 461 ((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))) { 462 s->mb_skip_run++; 463 s->qscale -= s->dquant; 464 s->skip_count++; 465 s->misc_bits++; 466 s->last_bits++; 467 if(s->pict_type == FF_P_TYPE){ 468 s->last_mv[0][1][0]= s->last_mv[0][0][0]= 469 s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0; 470 } 471 } else { 472 if(first_mb){ 473 assert(s->mb_skip_run == 0); 474 encode_mb_skip_run(s, s->mb_x); 475 }else{ 476 encode_mb_skip_run(s, s->mb_skip_run); 477 } 478 479 if (s->pict_type == FF_I_TYPE) { 480 if(s->dquant && cbp){ 481 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */ 482 put_qscale(s); 483 }else{ 484 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */ 485 s->qscale -= s->dquant; 486 } 487 s->misc_bits+= get_bits_diff(s); 488 s->i_count++; 489 } else if (s->mb_intra) { 490 if(s->dquant && cbp){ 491 put_mb_modes(s, 6, 0x01, 0, 0); 492 put_qscale(s); 493 }else{ 494 put_mb_modes(s, 5, 0x03, 0, 0); 495 s->qscale -= s->dquant; 496 } 497 s->misc_bits+= get_bits_diff(s); 498 s->i_count++; 499 memset(s->last_mv, 0, sizeof(s->last_mv)); 500 } else if (s->pict_type == FF_P_TYPE) { 501 if(s->mv_type == MV_TYPE_16X16){ 502 if (cbp != 0) { 503 if ((motion_x|motion_y) == 0) { 504 if(s->dquant){ 505 put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */ 506 put_qscale(s); 507 }else{ 508 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */ 509 } 510 s->misc_bits+= get_bits_diff(s); 511 } else { 512 if(s->dquant){ 513 put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */ 514 put_qscale(s); 515 }else{ 516 put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */ 517 } 518 s->misc_bits+= get_bits_diff(s); 519 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added 520 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added 521 s->mv_bits+= get_bits_diff(s); 522 } 523 } else { 524 put_bits(&s->pb, 3, 1); /* motion only */ 525 if (!s->frame_pred_frame_dct) 526 put_bits(&s->pb, 2, 2); /* motion_type: frame */ 527 s->misc_bits+= get_bits_diff(s); 528 mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added 529 mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added 530 s->qscale -= s->dquant; 531 s->mv_bits+= get_bits_diff(s); 532 } 533 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x; 534 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y; 535 }else{ 536 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD); 537 538 if (cbp) { 539 if(s->dquant){ 540 put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */ 541 put_qscale(s); 542 }else{ 543 put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */ 544 } 545 } else { 546 put_bits(&s->pb, 3, 1); /* motion only */ 547 put_bits(&s->pb, 2, 1); /* motion_type: field */ 548 s->qscale -= s->dquant; 549 } 550 s->misc_bits+= get_bits_diff(s); 551 for(i=0; i<2; i++){ 552 put_bits(&s->pb, 1, s->field_select[0][i]); 553 mpeg1_encode_motion(s, s->mv[0][i][0] - s->last_mv[0][i][0] , s->f_code); 554 mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code); 555 s->last_mv[0][i][0]= s->mv[0][i][0]; 556 s->last_mv[0][i][1]= 2*s->mv[0][i][1]; 557 } 558 s->mv_bits+= get_bits_diff(s); 559 } 560 if(cbp) { 561 if (s->chroma_y_shift) { 562 put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]); 563 } else { 564 put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]); 565 put_sbits(&s->pb, 2, cbp); 566 } 567 } 568 s->f_count++; 569 } else{ 570 if(s->mv_type == MV_TYPE_16X16){ 571 if (cbp){ // With coded bloc pattern 572 if (s->dquant) { 573 if(s->mv_dir == MV_DIR_FORWARD) 574 put_mb_modes(s, 6, 3, 1, 0); 575 else 576 put_mb_modes(s, 8-s->mv_dir, 2, 1, 0); 577 put_qscale(s); 578 } else { 579 put_mb_modes(s, 5-s->mv_dir, 3, 1, 0); 580 } 581 }else{ // No coded bloc pattern 582 put_bits(&s->pb, 5-s->mv_dir, 2); 583 if (!s->frame_pred_frame_dct) 584 put_bits(&s->pb, 2, 2); /* motion_type: frame */ 585 s->qscale -= s->dquant; 586 } 587 s->misc_bits += get_bits_diff(s); 588 if (s->mv_dir&MV_DIR_FORWARD){ 589 mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code); 590 mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code); 591 s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0]; 592 s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1]; 593 s->f_count++; 594 } 595 if (s->mv_dir&MV_DIR_BACKWARD){ 596 mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code); 597 mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code); 598 s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0]; 599 s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1]; 600 s->b_count++; 601 } 602 }else{ 603 assert(s->mv_type == MV_TYPE_FIELD); 604 assert(!s->frame_pred_frame_dct); 605 if (cbp){ // With coded bloc pattern 606 if (s->dquant) { 607 if(s->mv_dir == MV_DIR_FORWARD) 608 put_mb_modes(s, 6, 3, 1, 1); 609 else 610 put_mb_modes(s, 8-s->mv_dir, 2, 1, 1); 611 put_qscale(s); 612 } else { 613 put_mb_modes(s, 5-s->mv_dir, 3, 1, 1); 614 } 615 }else{ // No coded bloc pattern 616 put_bits(&s->pb, 5-s->mv_dir, 2); 617 put_bits(&s->pb, 2, 1); /* motion_type: field */ 618 s->qscale -= s->dquant; 619 } 620 s->misc_bits += get_bits_diff(s); 621 if (s->mv_dir&MV_DIR_FORWARD){ 622 for(i=0; i<2; i++){ 623 put_bits(&s->pb, 1, s->field_select[0][i]); 624 mpeg1_encode_motion(s, s->mv[0][i][0] - s->last_mv[0][i][0] , s->f_code); 625 mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code); 626 s->last_mv[0][i][0]= s->mv[0][i][0]; 627 s->last_mv[0][i][1]= 2*s->mv[0][i][1]; 628 } 629 s->f_count++; 630 } 631 if (s->mv_dir&MV_DIR_BACKWARD){ 632 for(i=0; i<2; i++){ 633 put_bits(&s->pb, 1, s->field_select[1][i]); 634 mpeg1_encode_motion(s, s->mv[1][i][0] - s->last_mv[1][i][0] , s->b_code); 635 mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code); 636 s->last_mv[1][i][0]= s->mv[1][i][0]; 637 s->last_mv[1][i][1]= 2*s->mv[1][i][1]; 638 } 639 s->b_count++; 640 } 641 } 642 s->mv_bits += get_bits_diff(s); 643 if(cbp) { 644 if (s->chroma_y_shift) { 645 put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]); 646 } else { 647 put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]); 648 put_sbits(&s->pb, 2, cbp); 649 } 650 } 651 } 652 for(i=0;i<mb_block_count;i++) { 653 if (cbp & (1 << (mb_block_count - 1 - i))) { 654 mpeg1_encode_block(s, block[i], i); 655 } 656 } 657 s->mb_skip_run = 0; 658 if(s->mb_intra) 659 s->i_tex_bits+= get_bits_diff(s); 660 else 661 s->p_tex_bits+= get_bits_diff(s); 662 } 663} 664 665void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y) 666{ 667 if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6); 668 else mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8); 669} 670 671// RAL: Parameter added: f_or_b_code 672static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code) 673{ 674 if (val == 0) { 675 /* zero vector */ 676 put_bits(&s->pb, 677 ff_mpeg12_mbMotionVectorTable[0][1], 678 ff_mpeg12_mbMotionVectorTable[0][0]); 679 } else { 680 int code, sign, bits; 681 int bit_size = f_or_b_code - 1; 682 int range = 1 << bit_size; 683 /* modulo encoding */ 684 int l= INT_BIT - 5 - bit_size; 685 val= (val<<l)>>l; 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 713void 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, range, code; 765 766 bit_size = f_code - 1; 767 range = 1 << bit_size; 768 769 val=mv; 770 if (val < 0) 771 val = -val; 772 val--; 773 code = (val >> bit_size) + 1; 774 if(code<17){ 775 len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size; 776 }else{ 777 len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size; 778 } 779 } 780 781 mv_penalty[f_code][mv+MAX_MV]= len; 782 } 783 } 784 785 786 for(f_code=MAX_FCODE; f_code>0; f_code--){ 787 for(mv=-(8<<f_code); mv<(8<<f_code); mv++){ 788 fcode_tab[mv+MAX_MV]= f_code; 789 } 790 } 791 } 792 s->me.mv_penalty= mv_penalty; 793 s->fcode_tab= fcode_tab; 794 if(s->codec_id == CODEC_ID_MPEG1VIDEO){ 795 s->min_qcoeff=-255; 796 s->max_qcoeff= 255; 797 }else{ 798 s->min_qcoeff=-2047; 799 s->max_qcoeff= 2047; 800 } 801 if (s->intra_vlc_format) { 802 s->intra_ac_vlc_length= 803 s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len; 804 } else { 805 s->intra_ac_vlc_length= 806 s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len; 807 } 808 s->inter_ac_vlc_length= 809 s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len; 810} 811 812static inline void encode_dc(MpegEncContext *s, int diff, int component) 813{ 814 if(((unsigned) (diff+255)) >= 511){ 815 int index; 816 817 if(diff<0){ 818 index= av_log2_16bit(-2*diff); 819 diff--; 820 }else{ 821 index= av_log2_16bit(2*diff); 822 } 823 if (component == 0) { 824 put_bits( 825 &s->pb, 826 ff_mpeg12_vlc_dc_lum_bits[index] + index, 827 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1))); 828 }else{ 829 put_bits( 830 &s->pb, 831 ff_mpeg12_vlc_dc_chroma_bits[index] + index, 832 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1))); 833 } 834 }else{ 835 if (component == 0) { 836 put_bits( 837 &s->pb, 838 mpeg1_lum_dc_uni[diff+255]&0xFF, 839 mpeg1_lum_dc_uni[diff+255]>>8); 840 } else { 841 put_bits( 842 &s->pb, 843 mpeg1_chr_dc_uni[diff+255]&0xFF, 844 mpeg1_chr_dc_uni[diff+255]>>8); 845 } 846 } 847} 848 849static void mpeg1_encode_block(MpegEncContext *s, 850 DCTELEM *block, 851 int n) 852{ 853 int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign; 854 int code, component; 855 const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc; 856 857 last_index = s->block_last_index[n]; 858 859 /* DC coef */ 860 if (s->mb_intra) { 861 component = (n <= 3 ? 0 : (n&1) + 1); 862 dc = block[0]; /* overflow is impossible */ 863 diff = dc - s->last_dc[component]; 864 encode_dc(s, diff, component); 865 s->last_dc[component] = dc; 866 i = 1; 867 if (s->intra_vlc_format) 868 table_vlc = ff_rl_mpeg2.table_vlc; 869 } else { 870 /* encode the first coefficient : needs to be done here because 871 it is handled slightly differently */ 872 level = block[0]; 873 if (abs(level) == 1) { 874 code = ((uint32_t)level >> 31); /* the sign bit */ 875 put_bits(&s->pb, 2, code | 0x02); 876 i = 1; 877 } else { 878 i = 0; 879 last_non_zero = -1; 880 goto next_coef; 881 } 882 } 883 884 /* now quantify & encode AC coefs */ 885 last_non_zero = i - 1; 886 887 for(;i<=last_index;i++) { 888 j = s->intra_scantable.permutated[i]; 889 level = block[j]; 890 next_coef: 891#if 0 892 if (level != 0) 893 dprintf(s->avctx, "level[%d]=%d\n", i, level); 894#endif 895 /* encode using VLC */ 896 if (level != 0) { 897 run = i - last_non_zero - 1; 898 899 alevel= level; 900 MASK_ABS(sign, alevel) 901 sign&=1; 902 903 if (alevel <= mpeg1_max_level[0][run]){ 904 code= mpeg1_index_run[0][run] + alevel - 1; 905 /* store the vlc & sign at once */ 906 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign); 907 } else { 908 /* escape seems to be pretty rare <5% so I do not optimize it */ 909 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]); 910 /* escape: only clip in this case */ 911 put_bits(&s->pb, 6, run); 912 if(s->codec_id == CODEC_ID_MPEG1VIDEO){ 913 if (alevel < 128) { 914 put_sbits(&s->pb, 8, level); 915 } else { 916 if (level < 0) { 917 put_bits(&s->pb, 16, 0x8001 + level + 255); 918 } else { 919 put_sbits(&s->pb, 16, level); 920 } 921 } 922 }else{ 923 put_sbits(&s->pb, 12, level); 924 } 925 } 926 last_non_zero = i; 927 } 928 } 929 /* end of block */ 930 put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]); 931} 932 933AVCodec mpeg1video_encoder = { 934 "mpeg1video", 935 AVMEDIA_TYPE_VIDEO, 936 CODEC_ID_MPEG1VIDEO, 937 sizeof(MpegEncContext), 938 encode_init, 939 MPV_encode_picture, 940 MPV_encode_end, 941 .supported_framerates= ff_frame_rate_tab+1, 942 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE}, 943 .capabilities= CODEC_CAP_DELAY, 944 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"), 945}; 946 947AVCodec mpeg2video_encoder = { 948 "mpeg2video", 949 AVMEDIA_TYPE_VIDEO, 950 CODEC_ID_MPEG2VIDEO, 951 sizeof(MpegEncContext), 952 encode_init, 953 MPV_encode_picture, 954 MPV_encode_end, 955 .supported_framerates= ff_frame_rate_tab+1, 956 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE}, 957 .capabilities= CODEC_CAP_DELAY, 958 .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"), 959}; 960