1/* 2 * MPEG-1/2 decoder 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 libavcodec/mpeg12.c 25 * MPEG-1/2 decoder 26 */ 27 28//#define DEBUG 29#include "internal.h" 30#include "avcodec.h" 31#include "dsputil.h" 32#include "mpegvideo.h" 33 34#include "mpeg12.h" 35#include "mpeg12data.h" 36#include "mpeg12decdata.h" 37#include "bytestream.h" 38#include "vdpau_internal.h" 39#include "xvmc_internal.h" 40 41//#undef NDEBUG 42//#include <assert.h> 43 44 45#define MV_VLC_BITS 9 46#define MBINCR_VLC_BITS 9 47#define MB_PAT_VLC_BITS 9 48#define MB_PTYPE_VLC_BITS 6 49#define MB_BTYPE_VLC_BITS 6 50 51static inline int mpeg1_decode_block_inter(MpegEncContext *s, 52 DCTELEM *block, 53 int n); 54static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n); 55static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 56 DCTELEM *block, 57 int n); 58static inline int mpeg2_decode_block_intra(MpegEncContext *s, 59 DCTELEM *block, 60 int n); 61static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n); 62static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n); 63static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred); 64static void exchange_uv(MpegEncContext *s); 65 66static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = { 67 PIX_FMT_XVMC_MPEG2_IDCT, 68 PIX_FMT_XVMC_MPEG2_MC, 69 PIX_FMT_NONE}; 70 71uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3]; 72 73 74#define INIT_2D_VLC_RL(rl, static_size)\ 75{\ 76 static RL_VLC_ELEM rl_vlc_table[static_size];\ 77 INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\ 78 &rl.table_vlc[0][1], 4, 2,\ 79 &rl.table_vlc[0][0], 4, 2, static_size);\ 80\ 81 rl.rl_vlc[0]= rl_vlc_table;\ 82 init_2d_vlc_rl(&rl);\ 83} 84 85static void init_2d_vlc_rl(RLTable *rl) 86{ 87 int i; 88 89 for(i=0; i<rl->vlc.table_size; i++){ 90 int code= rl->vlc.table[i][0]; 91 int len = rl->vlc.table[i][1]; 92 int level, run; 93 94 if(len==0){ // illegal code 95 run= 65; 96 level= MAX_LEVEL; 97 }else if(len<0){ //more bits needed 98 run= 0; 99 level= code; 100 }else{ 101 if(code==rl->n){ //esc 102 run= 65; 103 level= 0; 104 }else if(code==rl->n+1){ //eob 105 run= 0; 106 level= 127; 107 }else{ 108 run= rl->table_run [code] + 1; 109 level= rl->table_level[code]; 110 } 111 } 112 rl->rl_vlc[0][i].len= len; 113 rl->rl_vlc[0][i].level= level; 114 rl->rl_vlc[0][i].run= run; 115 } 116} 117 118void ff_mpeg12_common_init(MpegEncContext *s) 119{ 120 121 s->y_dc_scale_table= 122 s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision]; 123 124} 125 126void ff_mpeg1_clean_buffers(MpegEncContext *s){ 127 s->last_dc[0] = 1 << (7 + s->intra_dc_precision); 128 s->last_dc[1] = s->last_dc[0]; 129 s->last_dc[2] = s->last_dc[0]; 130 memset(s->last_mv, 0, sizeof(s->last_mv)); 131} 132 133 134/******************************************/ 135/* decoding */ 136 137static VLC mv_vlc; 138static VLC mbincr_vlc; 139static VLC mb_ptype_vlc; 140static VLC mb_btype_vlc; 141static VLC mb_pat_vlc; 142 143av_cold void ff_mpeg12_init_vlcs(void) 144{ 145 static int done = 0; 146 147 if (!done) { 148 done = 1; 149 150 INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12, 151 ff_mpeg12_vlc_dc_lum_bits, 1, 1, 152 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512); 153 INIT_VLC_STATIC(&dc_chroma_vlc, DC_VLC_BITS, 12, 154 ff_mpeg12_vlc_dc_chroma_bits, 1, 1, 155 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514); 156 INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17, 157 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1, 158 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518); 159 INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36, 160 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1, 161 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538); 162 INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64, 163 &ff_mpeg12_mbPatTable[0][1], 2, 1, 164 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512); 165 166 INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7, 167 &table_mb_ptype[0][1], 2, 1, 168 &table_mb_ptype[0][0], 2, 1, 64); 169 INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11, 170 &table_mb_btype[0][1], 2, 1, 171 &table_mb_btype[0][0], 2, 1, 64); 172 init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]); 173 init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]); 174 175 INIT_2D_VLC_RL(ff_rl_mpeg1, 680); 176 INIT_2D_VLC_RL(ff_rl_mpeg2, 674); 177 } 178} 179 180static inline int get_dmv(MpegEncContext *s) 181{ 182 if(get_bits1(&s->gb)) 183 return 1 - (get_bits1(&s->gb) << 1); 184 else 185 return 0; 186} 187 188static inline int get_qscale(MpegEncContext *s) 189{ 190 int qscale = get_bits(&s->gb, 5); 191 if (s->q_scale_type) { 192 return non_linear_qscale[qscale]; 193 } else { 194 return qscale << 1; 195 } 196} 197 198/* motion type (for MPEG-2) */ 199#define MT_FIELD 1 200#define MT_FRAME 2 201#define MT_16X8 2 202#define MT_DMV 3 203 204static int mpeg_decode_mb(MpegEncContext *s, 205 DCTELEM block[12][64]) 206{ 207 int i, j, k, cbp, val, mb_type, motion_type; 208 const int mb_block_count = 4 + (1<< s->chroma_format); 209 210 dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y); 211 212 assert(s->mb_skipped==0); 213 214 if (s->mb_skip_run-- != 0) { 215 if (s->pict_type == FF_P_TYPE) { 216 s->mb_skipped = 1; 217 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16; 218 } else { 219 int mb_type; 220 221 if(s->mb_x) 222 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]; 223 else 224 mb_type= s->current_picture.mb_type[ s->mb_width + (s->mb_y-1)*s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all 225 if(IS_INTRA(mb_type)) 226 return -1; 227 228 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= 229 mb_type | MB_TYPE_SKIP; 230// assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8)); 231 232 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0) 233 s->mb_skipped = 1; 234 } 235 236 return 0; 237 } 238 239 switch(s->pict_type) { 240 default: 241 case FF_I_TYPE: 242 if (get_bits1(&s->gb) == 0) { 243 if (get_bits1(&s->gb) == 0){ 244 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y); 245 return -1; 246 } 247 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA; 248 } else { 249 mb_type = MB_TYPE_INTRA; 250 } 251 break; 252 case FF_P_TYPE: 253 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1); 254 if (mb_type < 0){ 255 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y); 256 return -1; 257 } 258 mb_type = ptype2mb_type[ mb_type ]; 259 break; 260 case FF_B_TYPE: 261 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1); 262 if (mb_type < 0){ 263 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y); 264 return -1; 265 } 266 mb_type = btype2mb_type[ mb_type ]; 267 break; 268 } 269 dprintf(s->avctx, "mb_type=%x\n", mb_type); 270// motion_type = 0; /* avoid warning */ 271 if (IS_INTRA(mb_type)) { 272 s->dsp.clear_blocks(s->block[0]); 273 274 if(!s->chroma_y_shift){ 275 s->dsp.clear_blocks(s->block[6]); 276 } 277 278 /* compute DCT type */ 279 if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var? 280 !s->frame_pred_frame_dct) { 281 s->interlaced_dct = get_bits1(&s->gb); 282 } 283 284 if (IS_QUANT(mb_type)) 285 s->qscale = get_qscale(s); 286 287 if (s->concealment_motion_vectors) { 288 /* just parse them */ 289 if (s->picture_structure != PICT_FRAME) 290 skip_bits1(&s->gb); /* field select */ 291 292 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] = 293 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]); 294 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] = 295 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]); 296 297 skip_bits1(&s->gb); /* marker */ 298 }else 299 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */ 300 s->mb_intra = 1; 301 //if 1, we memcpy blocks in xvmcvideo 302 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){ 303 ff_xvmc_pack_pblocks(s,-1);//inter are always full blocks 304 if(s->swap_uv){ 305 exchange_uv(s); 306 } 307 } 308 309 if (s->codec_id == CODEC_ID_MPEG2VIDEO) { 310 if(s->flags2 & CODEC_FLAG2_FAST){ 311 for(i=0;i<6;i++) { 312 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i); 313 } 314 }else{ 315 for(i=0;i<mb_block_count;i++) { 316 if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0) 317 return -1; 318 } 319 } 320 } else { 321 for(i=0;i<6;i++) { 322 if (ff_mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0) 323 return -1; 324 } 325 } 326 } else { 327 if (mb_type & MB_TYPE_ZERO_MV){ 328 assert(mb_type & MB_TYPE_CBP); 329 330 s->mv_dir = MV_DIR_FORWARD; 331 if(s->picture_structure == PICT_FRAME){ 332 if(!s->frame_pred_frame_dct) 333 s->interlaced_dct = get_bits1(&s->gb); 334 s->mv_type = MV_TYPE_16X16; 335 }else{ 336 s->mv_type = MV_TYPE_FIELD; 337 mb_type |= MB_TYPE_INTERLACED; 338 s->field_select[0][0]= s->picture_structure - 1; 339 } 340 341 if (IS_QUANT(mb_type)) 342 s->qscale = get_qscale(s); 343 344 s->last_mv[0][0][0] = 0; 345 s->last_mv[0][0][1] = 0; 346 s->last_mv[0][1][0] = 0; 347 s->last_mv[0][1][1] = 0; 348 s->mv[0][0][0] = 0; 349 s->mv[0][0][1] = 0; 350 }else{ 351 assert(mb_type & MB_TYPE_L0L1); 352//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED 353 /* get additional motion vector type */ 354 if (s->frame_pred_frame_dct) 355 motion_type = MT_FRAME; 356 else{ 357 motion_type = get_bits(&s->gb, 2); 358 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type)) 359 s->interlaced_dct = get_bits1(&s->gb); 360 } 361 362 if (IS_QUANT(mb_type)) 363 s->qscale = get_qscale(s); 364 365 /* motion vectors */ 366 s->mv_dir= (mb_type>>13)&3; 367 dprintf(s->avctx, "motion_type=%d\n", motion_type); 368 switch(motion_type) { 369 case MT_FRAME: /* or MT_16X8 */ 370 if (s->picture_structure == PICT_FRAME) { 371 mb_type |= MB_TYPE_16x16; 372 s->mv_type = MV_TYPE_16X16; 373 for(i=0;i<2;i++) { 374 if (USES_LIST(mb_type, i)) { 375 /* MT_FRAME */ 376 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] = 377 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]); 378 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] = 379 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]); 380 /* full_pel: only for MPEG-1 */ 381 if (s->full_pel[i]){ 382 s->mv[i][0][0] <<= 1; 383 s->mv[i][0][1] <<= 1; 384 } 385 } 386 } 387 } else { 388 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 389 s->mv_type = MV_TYPE_16X8; 390 for(i=0;i<2;i++) { 391 if (USES_LIST(mb_type, i)) { 392 /* MT_16X8 */ 393 for(j=0;j<2;j++) { 394 s->field_select[i][j] = get_bits1(&s->gb); 395 for(k=0;k<2;k++) { 396 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k], 397 s->last_mv[i][j][k]); 398 s->last_mv[i][j][k] = val; 399 s->mv[i][j][k] = val; 400 } 401 } 402 } 403 } 404 } 405 break; 406 case MT_FIELD: 407 s->mv_type = MV_TYPE_FIELD; 408 if (s->picture_structure == PICT_FRAME) { 409 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 410 for(i=0;i<2;i++) { 411 if (USES_LIST(mb_type, i)) { 412 for(j=0;j<2;j++) { 413 s->field_select[i][j] = get_bits1(&s->gb); 414 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0], 415 s->last_mv[i][j][0]); 416 s->last_mv[i][j][0] = val; 417 s->mv[i][j][0] = val; 418 dprintf(s->avctx, "fmx=%d\n", val); 419 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1], 420 s->last_mv[i][j][1] >> 1); 421 s->last_mv[i][j][1] = val << 1; 422 s->mv[i][j][1] = val; 423 dprintf(s->avctx, "fmy=%d\n", val); 424 } 425 } 426 } 427 } else { 428 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 429 for(i=0;i<2;i++) { 430 if (USES_LIST(mb_type, i)) { 431 s->field_select[i][0] = get_bits1(&s->gb); 432 for(k=0;k<2;k++) { 433 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k], 434 s->last_mv[i][0][k]); 435 s->last_mv[i][0][k] = val; 436 s->last_mv[i][1][k] = val; 437 s->mv[i][0][k] = val; 438 } 439 } 440 } 441 } 442 break; 443 case MT_DMV: 444 s->mv_type = MV_TYPE_DMV; 445 for(i=0;i<2;i++) { 446 if (USES_LIST(mb_type, i)) { 447 int dmx, dmy, mx, my, m; 448 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0], 449 s->last_mv[i][0][0]); 450 s->last_mv[i][0][0] = mx; 451 s->last_mv[i][1][0] = mx; 452 dmx = get_dmv(s); 453 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1], 454 s->last_mv[i][0][1] >> 1); 455 dmy = get_dmv(s); 456 457 458 s->last_mv[i][0][1] = my<<1; 459 s->last_mv[i][1][1] = my<<1; 460 461 s->mv[i][0][0] = mx; 462 s->mv[i][0][1] = my; 463 s->mv[i][1][0] = mx;//not used 464 s->mv[i][1][1] = my;//not used 465 466 if (s->picture_structure == PICT_FRAME) { 467 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 468 469 //m = 1 + 2 * s->top_field_first; 470 m = s->top_field_first ? 1 : 3; 471 472 /* top -> top pred */ 473 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx; 474 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1; 475 m = 4 - m; 476 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx; 477 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1; 478 } else { 479 mb_type |= MB_TYPE_16x16; 480 481 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx; 482 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy; 483 if(s->picture_structure == PICT_TOP_FIELD) 484 s->mv[i][2][1]--; 485 else 486 s->mv[i][2][1]++; 487 } 488 } 489 } 490 break; 491 default: 492 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y); 493 return -1; 494 } 495 } 496 497 s->mb_intra = 0; 498 if (HAS_CBP(mb_type)) { 499 s->dsp.clear_blocks(s->block[0]); 500 501 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1); 502 if(mb_block_count > 6){ 503 cbp<<= mb_block_count-6; 504 cbp |= get_bits(&s->gb, mb_block_count-6); 505 s->dsp.clear_blocks(s->block[6]); 506 } 507 if (cbp <= 0){ 508 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y); 509 return -1; 510 } 511 512 //if 1, we memcpy blocks in xvmcvideo 513 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){ 514 ff_xvmc_pack_pblocks(s,cbp); 515 if(s->swap_uv){ 516 exchange_uv(s); 517 } 518 } 519 520 if (s->codec_id == CODEC_ID_MPEG2VIDEO) { 521 if(s->flags2 & CODEC_FLAG2_FAST){ 522 for(i=0;i<6;i++) { 523 if(cbp & 32) { 524 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i); 525 } else { 526 s->block_last_index[i] = -1; 527 } 528 cbp+=cbp; 529 } 530 }else{ 531 cbp<<= 12-mb_block_count; 532 533 for(i=0;i<mb_block_count;i++) { 534 if ( cbp & (1<<11) ) { 535 if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0) 536 return -1; 537 } else { 538 s->block_last_index[i] = -1; 539 } 540 cbp+=cbp; 541 } 542 } 543 } else { 544 if(s->flags2 & CODEC_FLAG2_FAST){ 545 for(i=0;i<6;i++) { 546 if (cbp & 32) { 547 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i); 548 } else { 549 s->block_last_index[i] = -1; 550 } 551 cbp+=cbp; 552 } 553 }else{ 554 for(i=0;i<6;i++) { 555 if (cbp & 32) { 556 if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0) 557 return -1; 558 } else { 559 s->block_last_index[i] = -1; 560 } 561 cbp+=cbp; 562 } 563 } 564 } 565 }else{ 566 for(i=0;i<12;i++) 567 s->block_last_index[i] = -1; 568 } 569 } 570 571 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type; 572 573 return 0; 574} 575 576/* as H.263, but only 17 codes */ 577static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred) 578{ 579 int code, sign, val, l, shift; 580 581 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2); 582 if (code == 0) { 583 return pred; 584 } 585 if (code < 0) { 586 return 0xffff; 587 } 588 589 sign = get_bits1(&s->gb); 590 shift = fcode - 1; 591 val = code; 592 if (shift) { 593 val = (val - 1) << shift; 594 val |= get_bits(&s->gb, shift); 595 val++; 596 } 597 if (sign) 598 val = -val; 599 val += pred; 600 601 /* modulo decoding */ 602 l= INT_BIT - 5 - shift; 603 val = (val<<l)>>l; 604 return val; 605} 606 607inline int ff_mpeg1_decode_block_intra(MpegEncContext *s, 608 DCTELEM *block, 609 int n) 610{ 611 int level, dc, diff, i, j, run; 612 int component; 613 RLTable *rl = &ff_rl_mpeg1; 614 uint8_t * const scantable= s->intra_scantable.permutated; 615 const uint16_t *quant_matrix= s->intra_matrix; 616 const int qscale= s->qscale; 617 618 /* DC coefficient */ 619 component = (n <= 3 ? 0 : n - 4 + 1); 620 diff = decode_dc(&s->gb, component); 621 if (diff >= 0xffff) 622 return -1; 623 dc = s->last_dc[component]; 624 dc += diff; 625 s->last_dc[component] = dc; 626 block[0] = dc*quant_matrix[0]; 627 dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff); 628 i = 0; 629 { 630 OPEN_READER(re, &s->gb); 631 /* now quantify & encode AC coefficients */ 632 for(;;) { 633 UPDATE_CACHE(re, &s->gb); 634 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); 635 636 if(level == 127){ 637 break; 638 } else if(level != 0) { 639 i += run; 640 j = scantable[i]; 641 level= (level*qscale*quant_matrix[j])>>4; 642 level= (level-1)|1; 643 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); 644 LAST_SKIP_BITS(re, &s->gb, 1); 645 } else { 646 /* escape */ 647 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); 648 UPDATE_CACHE(re, &s->gb); 649 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8); 650 if (level == -128) { 651 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8); 652 } else if (level == 0) { 653 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8); 654 } 655 i += run; 656 j = scantable[i]; 657 if(level<0){ 658 level= -level; 659 level= (level*qscale*quant_matrix[j])>>4; 660 level= (level-1)|1; 661 level= -level; 662 }else{ 663 level= (level*qscale*quant_matrix[j])>>4; 664 level= (level-1)|1; 665 } 666 } 667 if (i > 63){ 668 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); 669 return -1; 670 } 671 672 block[j] = level; 673 } 674 CLOSE_READER(re, &s->gb); 675 } 676 s->block_last_index[n] = i; 677 return 0; 678} 679 680static inline int mpeg1_decode_block_inter(MpegEncContext *s, 681 DCTELEM *block, 682 int n) 683{ 684 int level, i, j, run; 685 RLTable *rl = &ff_rl_mpeg1; 686 uint8_t * const scantable= s->intra_scantable.permutated; 687 const uint16_t *quant_matrix= s->inter_matrix; 688 const int qscale= s->qscale; 689 690 { 691 OPEN_READER(re, &s->gb); 692 i = -1; 693 // special case for first coefficient, no need to add second VLC table 694 UPDATE_CACHE(re, &s->gb); 695 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) { 696 level= (3*qscale*quant_matrix[0])>>5; 697 level= (level-1)|1; 698 if(GET_CACHE(re, &s->gb)&0x40000000) 699 level= -level; 700 block[0] = level; 701 i++; 702 SKIP_BITS(re, &s->gb, 2); 703 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) 704 goto end; 705 } 706#if MIN_CACHE_BITS < 19 707 UPDATE_CACHE(re, &s->gb); 708#endif 709 /* now quantify & encode AC coefficients */ 710 for(;;) { 711 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); 712 713 if(level != 0) { 714 i += run; 715 j = scantable[i]; 716 level= ((level*2+1)*qscale*quant_matrix[j])>>5; 717 level= (level-1)|1; 718 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); 719 SKIP_BITS(re, &s->gb, 1); 720 } else { 721 /* escape */ 722 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); 723 UPDATE_CACHE(re, &s->gb); 724 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8); 725 if (level == -128) { 726 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8); 727 } else if (level == 0) { 728 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8); 729 } 730 i += run; 731 j = scantable[i]; 732 if(level<0){ 733 level= -level; 734 level= ((level*2+1)*qscale*quant_matrix[j])>>5; 735 level= (level-1)|1; 736 level= -level; 737 }else{ 738 level= ((level*2+1)*qscale*quant_matrix[j])>>5; 739 level= (level-1)|1; 740 } 741 } 742 if (i > 63){ 743 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); 744 return -1; 745 } 746 747 block[j] = level; 748#if MIN_CACHE_BITS < 19 749 UPDATE_CACHE(re, &s->gb); 750#endif 751 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) 752 break; 753#if MIN_CACHE_BITS >= 19 754 UPDATE_CACHE(re, &s->gb); 755#endif 756 } 757end: 758 LAST_SKIP_BITS(re, &s->gb, 2); 759 CLOSE_READER(re, &s->gb); 760 } 761 s->block_last_index[n] = i; 762 return 0; 763} 764 765static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n) 766{ 767 int level, i, j, run; 768 RLTable *rl = &ff_rl_mpeg1; 769 uint8_t * const scantable= s->intra_scantable.permutated; 770 const int qscale= s->qscale; 771 772 { 773 OPEN_READER(re, &s->gb); 774 i = -1; 775 // special case for first coefficient, no need to add second VLC table 776 UPDATE_CACHE(re, &s->gb); 777 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) { 778 level= (3*qscale)>>1; 779 level= (level-1)|1; 780 if(GET_CACHE(re, &s->gb)&0x40000000) 781 level= -level; 782 block[0] = level; 783 i++; 784 SKIP_BITS(re, &s->gb, 2); 785 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) 786 goto end; 787 } 788#if MIN_CACHE_BITS < 19 789 UPDATE_CACHE(re, &s->gb); 790#endif 791 792 /* now quantify & encode AC coefficients */ 793 for(;;) { 794 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); 795 796 if(level != 0) { 797 i += run; 798 j = scantable[i]; 799 level= ((level*2+1)*qscale)>>1; 800 level= (level-1)|1; 801 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); 802 SKIP_BITS(re, &s->gb, 1); 803 } else { 804 /* escape */ 805 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); 806 UPDATE_CACHE(re, &s->gb); 807 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8); 808 if (level == -128) { 809 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8); 810 } else if (level == 0) { 811 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8); 812 } 813 i += run; 814 j = scantable[i]; 815 if(level<0){ 816 level= -level; 817 level= ((level*2+1)*qscale)>>1; 818 level= (level-1)|1; 819 level= -level; 820 }else{ 821 level= ((level*2+1)*qscale)>>1; 822 level= (level-1)|1; 823 } 824 } 825 826 block[j] = level; 827#if MIN_CACHE_BITS < 19 828 UPDATE_CACHE(re, &s->gb); 829#endif 830 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) 831 break; 832#if MIN_CACHE_BITS >= 19 833 UPDATE_CACHE(re, &s->gb); 834#endif 835 } 836end: 837 LAST_SKIP_BITS(re, &s->gb, 2); 838 CLOSE_READER(re, &s->gb); 839 } 840 s->block_last_index[n] = i; 841 return 0; 842} 843 844 845static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 846 DCTELEM *block, 847 int n) 848{ 849 int level, i, j, run; 850 RLTable *rl = &ff_rl_mpeg1; 851 uint8_t * const scantable= s->intra_scantable.permutated; 852 const uint16_t *quant_matrix; 853 const int qscale= s->qscale; 854 int mismatch; 855 856 mismatch = 1; 857 858 { 859 OPEN_READER(re, &s->gb); 860 i = -1; 861 if (n < 4) 862 quant_matrix = s->inter_matrix; 863 else 864 quant_matrix = s->chroma_inter_matrix; 865 866 // special case for first coefficient, no need to add second VLC table 867 UPDATE_CACHE(re, &s->gb); 868 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) { 869 level= (3*qscale*quant_matrix[0])>>5; 870 if(GET_CACHE(re, &s->gb)&0x40000000) 871 level= -level; 872 block[0] = level; 873 mismatch ^= level; 874 i++; 875 SKIP_BITS(re, &s->gb, 2); 876 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) 877 goto end; 878 } 879#if MIN_CACHE_BITS < 19 880 UPDATE_CACHE(re, &s->gb); 881#endif 882 883 /* now quantify & encode AC coefficients */ 884 for(;;) { 885 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); 886 887 if(level != 0) { 888 i += run; 889 j = scantable[i]; 890 level= ((level*2+1)*qscale*quant_matrix[j])>>5; 891 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); 892 SKIP_BITS(re, &s->gb, 1); 893 } else { 894 /* escape */ 895 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); 896 UPDATE_CACHE(re, &s->gb); 897 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12); 898 899 i += run; 900 j = scantable[i]; 901 if(level<0){ 902 level= ((-level*2+1)*qscale*quant_matrix[j])>>5; 903 level= -level; 904 }else{ 905 level= ((level*2+1)*qscale*quant_matrix[j])>>5; 906 } 907 } 908 if (i > 63){ 909 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); 910 return -1; 911 } 912 913 mismatch ^= level; 914 block[j] = level; 915#if MIN_CACHE_BITS < 19 916 UPDATE_CACHE(re, &s->gb); 917#endif 918 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) 919 break; 920#if MIN_CACHE_BITS >= 19 921 UPDATE_CACHE(re, &s->gb); 922#endif 923 } 924end: 925 LAST_SKIP_BITS(re, &s->gb, 2); 926 CLOSE_READER(re, &s->gb); 927 } 928 block[63] ^= (mismatch & 1); 929 930 s->block_last_index[n] = i; 931 return 0; 932} 933 934static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, 935 DCTELEM *block, 936 int n) 937{ 938 int level, i, j, run; 939 RLTable *rl = &ff_rl_mpeg1; 940 uint8_t * const scantable= s->intra_scantable.permutated; 941 const int qscale= s->qscale; 942 OPEN_READER(re, &s->gb); 943 i = -1; 944 945 // special case for first coefficient, no need to add second VLC table 946 UPDATE_CACHE(re, &s->gb); 947 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) { 948 level= (3*qscale)>>1; 949 if(GET_CACHE(re, &s->gb)&0x40000000) 950 level= -level; 951 block[0] = level; 952 i++; 953 SKIP_BITS(re, &s->gb, 2); 954 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) 955 goto end; 956 } 957#if MIN_CACHE_BITS < 19 958 UPDATE_CACHE(re, &s->gb); 959#endif 960 961 /* now quantify & encode AC coefficients */ 962 for(;;) { 963 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); 964 965 if(level != 0) { 966 i += run; 967 j = scantable[i]; 968 level= ((level*2+1)*qscale)>>1; 969 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); 970 SKIP_BITS(re, &s->gb, 1); 971 } else { 972 /* escape */ 973 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); 974 UPDATE_CACHE(re, &s->gb); 975 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12); 976 977 i += run; 978 j = scantable[i]; 979 if(level<0){ 980 level= ((-level*2+1)*qscale)>>1; 981 level= -level; 982 }else{ 983 level= ((level*2+1)*qscale)>>1; 984 } 985 } 986 987 block[j] = level; 988#if MIN_CACHE_BITS < 19 989 UPDATE_CACHE(re, &s->gb); 990#endif 991 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) 992 break; 993#if MIN_CACHE_BITS >=19 994 UPDATE_CACHE(re, &s->gb); 995#endif 996 } 997end: 998 LAST_SKIP_BITS(re, &s->gb, 2); 999 CLOSE_READER(re, &s->gb); 1000 s->block_last_index[n] = i; 1001 return 0; 1002} 1003 1004 1005static inline int mpeg2_decode_block_intra(MpegEncContext *s, 1006 DCTELEM *block, 1007 int n) 1008{ 1009 int level, dc, diff, i, j, run; 1010 int component; 1011 RLTable *rl; 1012 uint8_t * const scantable= s->intra_scantable.permutated; 1013 const uint16_t *quant_matrix; 1014 const int qscale= s->qscale; 1015 int mismatch; 1016 1017 /* DC coefficient */ 1018 if (n < 4){ 1019 quant_matrix = s->intra_matrix; 1020 component = 0; 1021 }else{ 1022 quant_matrix = s->chroma_intra_matrix; 1023 component = (n&1) + 1; 1024 } 1025 diff = decode_dc(&s->gb, component); 1026 if (diff >= 0xffff) 1027 return -1; 1028 dc = s->last_dc[component]; 1029 dc += diff; 1030 s->last_dc[component] = dc; 1031 block[0] = dc << (3 - s->intra_dc_precision); 1032 dprintf(s->avctx, "dc=%d\n", block[0]); 1033 mismatch = block[0] ^ 1; 1034 i = 0; 1035 if (s->intra_vlc_format) 1036 rl = &ff_rl_mpeg2; 1037 else 1038 rl = &ff_rl_mpeg1; 1039 1040 { 1041 OPEN_READER(re, &s->gb); 1042 /* now quantify & encode AC coefficients */ 1043 for(;;) { 1044 UPDATE_CACHE(re, &s->gb); 1045 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); 1046 1047 if(level == 127){ 1048 break; 1049 } else if(level != 0) { 1050 i += run; 1051 j = scantable[i]; 1052 level= (level*qscale*quant_matrix[j])>>4; 1053 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); 1054 LAST_SKIP_BITS(re, &s->gb, 1); 1055 } else { 1056 /* escape */ 1057 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); 1058 UPDATE_CACHE(re, &s->gb); 1059 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12); 1060 i += run; 1061 j = scantable[i]; 1062 if(level<0){ 1063 level= (-level*qscale*quant_matrix[j])>>4; 1064 level= -level; 1065 }else{ 1066 level= (level*qscale*quant_matrix[j])>>4; 1067 } 1068 } 1069 if (i > 63){ 1070 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); 1071 return -1; 1072 } 1073 1074 mismatch^= level; 1075 block[j] = level; 1076 } 1077 CLOSE_READER(re, &s->gb); 1078 } 1079 block[63]^= mismatch&1; 1080 1081 s->block_last_index[n] = i; 1082 return 0; 1083} 1084 1085static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, 1086 DCTELEM *block, 1087 int n) 1088{ 1089 int level, dc, diff, j, run; 1090 int component; 1091 RLTable *rl; 1092 uint8_t * scantable= s->intra_scantable.permutated; 1093 const uint16_t *quant_matrix; 1094 const int qscale= s->qscale; 1095 1096 /* DC coefficient */ 1097 if (n < 4){ 1098 quant_matrix = s->intra_matrix; 1099 component = 0; 1100 }else{ 1101 quant_matrix = s->chroma_intra_matrix; 1102 component = (n&1) + 1; 1103 } 1104 diff = decode_dc(&s->gb, component); 1105 if (diff >= 0xffff) 1106 return -1; 1107 dc = s->last_dc[component]; 1108 dc += diff; 1109 s->last_dc[component] = dc; 1110 block[0] = dc << (3 - s->intra_dc_precision); 1111 if (s->intra_vlc_format) 1112 rl = &ff_rl_mpeg2; 1113 else 1114 rl = &ff_rl_mpeg1; 1115 1116 { 1117 OPEN_READER(re, &s->gb); 1118 /* now quantify & encode AC coefficients */ 1119 for(;;) { 1120 UPDATE_CACHE(re, &s->gb); 1121 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); 1122 1123 if(level == 127){ 1124 break; 1125 } else if(level != 0) { 1126 scantable += run; 1127 j = *scantable; 1128 level= (level*qscale*quant_matrix[j])>>4; 1129 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); 1130 LAST_SKIP_BITS(re, &s->gb, 1); 1131 } else { 1132 /* escape */ 1133 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); 1134 UPDATE_CACHE(re, &s->gb); 1135 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12); 1136 scantable += run; 1137 j = *scantable; 1138 if(level<0){ 1139 level= (-level*qscale*quant_matrix[j])>>4; 1140 level= -level; 1141 }else{ 1142 level= (level*qscale*quant_matrix[j])>>4; 1143 } 1144 } 1145 1146 block[j] = level; 1147 } 1148 CLOSE_READER(re, &s->gb); 1149 } 1150 1151 s->block_last_index[n] = scantable - s->intra_scantable.permutated; 1152 return 0; 1153} 1154 1155typedef struct Mpeg1Context { 1156 MpegEncContext mpeg_enc_ctx; 1157 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */ 1158 int repeat_field; /* true if we must repeat the field */ 1159 AVPanScan pan_scan; /** some temporary storage for the panscan */ 1160 int slice_count; 1161 int swap_uv;//indicate VCR2 1162 int save_aspect_info; 1163 int save_width, save_height; 1164 AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator 1165 1166} Mpeg1Context; 1167 1168static av_cold int mpeg_decode_init(AVCodecContext *avctx) 1169{ 1170 Mpeg1Context *s = avctx->priv_data; 1171 MpegEncContext *s2 = &s->mpeg_enc_ctx; 1172 int i; 1173 1174 /* we need some permutation to store matrices, 1175 * until MPV_common_init() sets the real permutation. */ 1176 for(i=0;i<64;i++) 1177 s2->dsp.idct_permutation[i]=i; 1178 1179 MPV_decode_defaults(s2); 1180 1181 s->mpeg_enc_ctx.avctx= avctx; 1182 s->mpeg_enc_ctx.flags= avctx->flags; 1183 s->mpeg_enc_ctx.flags2= avctx->flags2; 1184 ff_mpeg12_common_init(&s->mpeg_enc_ctx); 1185 ff_mpeg12_init_vlcs(); 1186 1187 s->mpeg_enc_ctx_allocated = 0; 1188 s->mpeg_enc_ctx.picture_number = 0; 1189 s->repeat_field = 0; 1190 s->mpeg_enc_ctx.codec_id= avctx->codec->id; 1191 return 0; 1192} 1193 1194static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm, 1195 const uint8_t *new_perm){ 1196 uint16_t temp_matrix[64]; 1197 int i; 1198 1199 memcpy(temp_matrix,matrix,64*sizeof(uint16_t)); 1200 1201 for(i=0;i<64;i++){ 1202 matrix[new_perm[i]] = temp_matrix[old_perm[i]]; 1203 } 1204} 1205 1206static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){ 1207 Mpeg1Context *s1 = avctx->priv_data; 1208 MpegEncContext *s = &s1->mpeg_enc_ctx; 1209 1210 if(avctx->xvmc_acceleration) 1211 return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420); 1212 else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){ 1213 if(avctx->codec_id == CODEC_ID_MPEG1VIDEO) 1214 return PIX_FMT_VDPAU_MPEG1; 1215 else 1216 return PIX_FMT_VDPAU_MPEG2; 1217 }else{ 1218 if(s->chroma_format < 2) 1219 return avctx->get_format(avctx,ff_hwaccel_pixfmt_list_420); 1220 else if(s->chroma_format == 2) 1221 return PIX_FMT_YUV422P; 1222 else 1223 return PIX_FMT_YUV444P; 1224 } 1225} 1226 1227/* Call this function when we know all parameters. 1228 * It may be called in different places for MPEG-1 and MPEG-2. */ 1229static int mpeg_decode_postinit(AVCodecContext *avctx){ 1230 Mpeg1Context *s1 = avctx->priv_data; 1231 MpegEncContext *s = &s1->mpeg_enc_ctx; 1232 uint8_t old_permutation[64]; 1233 1234 if ( 1235 (s1->mpeg_enc_ctx_allocated == 0)|| 1236 avctx->coded_width != s->width || 1237 avctx->coded_height != s->height|| 1238 s1->save_width != s->width || 1239 s1->save_height != s->height || 1240 s1->save_aspect_info != s->aspect_ratio_info|| 1241 0) 1242 { 1243 1244 if (s1->mpeg_enc_ctx_allocated) { 1245 ParseContext pc= s->parse_context; 1246 s->parse_context.buffer=0; 1247 MPV_common_end(s); 1248 s->parse_context= pc; 1249 } 1250 1251 if( (s->width == 0 )||(s->height == 0)) 1252 return -2; 1253 1254 avcodec_set_dimensions(avctx, s->width, s->height); 1255 avctx->bit_rate = s->bit_rate; 1256 s1->save_aspect_info = s->aspect_ratio_info; 1257 s1->save_width = s->width; 1258 s1->save_height = s->height; 1259 1260 /* low_delay may be forced, in this case we will have B-frames 1261 * that behave like P-frames. */ 1262 avctx->has_b_frames = !(s->low_delay); 1263 1264 assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO)); 1265 if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){ 1266 //MPEG-1 fps 1267 avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num; 1268 avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den; 1269 //MPEG-1 aspect 1270 avctx->sample_aspect_ratio= av_d2q( 1271 1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255); 1272 avctx->ticks_per_frame=1; 1273 }else{//MPEG-2 1274 //MPEG-2 fps 1275 av_reduce( 1276 &s->avctx->time_base.den, 1277 &s->avctx->time_base.num, 1278 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2, 1279 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den, 1280 1<<30); 1281 avctx->ticks_per_frame=2; 1282 //MPEG-2 aspect 1283 if(s->aspect_ratio_info > 1){ 1284 //we ignore the spec here as reality does not match the spec, see for example 1285 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg 1286 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){ 1287 s->avctx->sample_aspect_ratio= 1288 av_div_q( 1289 ff_mpeg2_aspect[s->aspect_ratio_info], 1290 (AVRational){s->width, s->height} 1291 ); 1292 }else{ 1293 s->avctx->sample_aspect_ratio= 1294 av_div_q( 1295 ff_mpeg2_aspect[s->aspect_ratio_info], 1296 (AVRational){s1->pan_scan.width, s1->pan_scan.height} 1297 ); 1298 } 1299 }else{ 1300 s->avctx->sample_aspect_ratio= 1301 ff_mpeg2_aspect[s->aspect_ratio_info]; 1302 } 1303 }//MPEG-2 1304 1305 avctx->pix_fmt = mpeg_get_pixelformat(avctx); 1306 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt); 1307 //until then pix_fmt may be changed right after codec init 1308 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || 1309 avctx->hwaccel || 1310 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU ) 1311 if( avctx->idct_algo == FF_IDCT_AUTO ) 1312 avctx->idct_algo = FF_IDCT_SIMPLE; 1313 1314 /* Quantization matrices may need reordering 1315 * if DCT permutation is changed. */ 1316 memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t)); 1317 1318 if (MPV_common_init(s) < 0) 1319 return -2; 1320 1321 quant_matrix_rebuild(s->intra_matrix, old_permutation,s->dsp.idct_permutation); 1322 quant_matrix_rebuild(s->inter_matrix, old_permutation,s->dsp.idct_permutation); 1323 quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation); 1324 quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation); 1325 1326 s1->mpeg_enc_ctx_allocated = 1; 1327 } 1328 return 0; 1329} 1330 1331static int mpeg1_decode_picture(AVCodecContext *avctx, 1332 const uint8_t *buf, int buf_size) 1333{ 1334 Mpeg1Context *s1 = avctx->priv_data; 1335 MpegEncContext *s = &s1->mpeg_enc_ctx; 1336 int ref, f_code, vbv_delay; 1337 1338 if(mpeg_decode_postinit(s->avctx) < 0) 1339 return -2; 1340 1341 init_get_bits(&s->gb, buf, buf_size*8); 1342 1343 ref = get_bits(&s->gb, 10); /* temporal ref */ 1344 s->pict_type = get_bits(&s->gb, 3); 1345 if(s->pict_type == 0 || s->pict_type > 3) 1346 return -1; 1347 1348 vbv_delay= get_bits(&s->gb, 16); 1349 if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) { 1350 s->full_pel[0] = get_bits1(&s->gb); 1351 f_code = get_bits(&s->gb, 3); 1352 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT) 1353 return -1; 1354 s->mpeg_f_code[0][0] = f_code; 1355 s->mpeg_f_code[0][1] = f_code; 1356 } 1357 if (s->pict_type == FF_B_TYPE) { 1358 s->full_pel[1] = get_bits1(&s->gb); 1359 f_code = get_bits(&s->gb, 3); 1360 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT) 1361 return -1; 1362 s->mpeg_f_code[1][0] = f_code; 1363 s->mpeg_f_code[1][1] = f_code; 1364 } 1365 s->current_picture.pict_type= s->pict_type; 1366 s->current_picture.key_frame= s->pict_type == FF_I_TYPE; 1367 1368 if(avctx->debug & FF_DEBUG_PICT_INFO) 1369 av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type); 1370 1371 s->y_dc_scale = 8; 1372 s->c_dc_scale = 8; 1373 s->first_slice = 1; 1374 return 0; 1375} 1376 1377static void mpeg_decode_sequence_extension(Mpeg1Context *s1) 1378{ 1379 MpegEncContext *s= &s1->mpeg_enc_ctx; 1380 int horiz_size_ext, vert_size_ext; 1381 int bit_rate_ext; 1382 1383 skip_bits(&s->gb, 1); /* profile and level esc*/ 1384 s->avctx->profile= get_bits(&s->gb, 3); 1385 s->avctx->level= get_bits(&s->gb, 4); 1386 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */ 1387 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */ 1388 horiz_size_ext = get_bits(&s->gb, 2); 1389 vert_size_ext = get_bits(&s->gb, 2); 1390 s->width |= (horiz_size_ext << 12); 1391 s->height |= (vert_size_ext << 12); 1392 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */ 1393 s->bit_rate += (bit_rate_ext << 18) * 400; 1394 skip_bits1(&s->gb); /* marker */ 1395 s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10; 1396 1397 s->low_delay = get_bits1(&s->gb); 1398 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1; 1399 1400 s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1; 1401 s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1; 1402 1403 dprintf(s->avctx, "sequence extension\n"); 1404 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO; 1405 s->avctx->sub_id = 2; /* indicates MPEG-2 found */ 1406 1407 if(s->avctx->debug & FF_DEBUG_PICT_INFO) 1408 av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n", 1409 s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate); 1410 1411} 1412 1413static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1) 1414{ 1415 MpegEncContext *s= &s1->mpeg_enc_ctx; 1416 int color_description, w, h; 1417 1418 skip_bits(&s->gb, 3); /* video format */ 1419 color_description= get_bits1(&s->gb); 1420 if(color_description){ 1421 skip_bits(&s->gb, 8); /* color primaries */ 1422 skip_bits(&s->gb, 8); /* transfer_characteristics */ 1423 skip_bits(&s->gb, 8); /* matrix_coefficients */ 1424 } 1425 w= get_bits(&s->gb, 14); 1426 skip_bits(&s->gb, 1); //marker 1427 h= get_bits(&s->gb, 14); 1428 skip_bits(&s->gb, 1); //marker 1429 1430 s1->pan_scan.width= 16*w; 1431 s1->pan_scan.height=16*h; 1432 1433 if(s->avctx->debug & FF_DEBUG_PICT_INFO) 1434 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h); 1435} 1436 1437static void mpeg_decode_picture_display_extension(Mpeg1Context *s1) 1438{ 1439 MpegEncContext *s= &s1->mpeg_enc_ctx; 1440 int i,nofco; 1441 1442 nofco = 1; 1443 if(s->progressive_sequence){ 1444 if(s->repeat_first_field){ 1445 nofco++; 1446 if(s->top_field_first) 1447 nofco++; 1448 } 1449 }else{ 1450 if(s->picture_structure == PICT_FRAME){ 1451 nofco++; 1452 if(s->repeat_first_field) 1453 nofco++; 1454 } 1455 } 1456 for(i=0; i<nofco; i++){ 1457 s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16); 1458 skip_bits(&s->gb, 1); //marker 1459 s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16); 1460 skip_bits(&s->gb, 1); //marker 1461 } 1462 1463 if(s->avctx->debug & FF_DEBUG_PICT_INFO) 1464 av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n", 1465 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1], 1466 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1], 1467 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1] 1468 ); 1469} 1470 1471static void mpeg_decode_quant_matrix_extension(MpegEncContext *s) 1472{ 1473 int i, v, j; 1474 1475 dprintf(s->avctx, "matrix extension\n"); 1476 1477 if (get_bits1(&s->gb)) { 1478 for(i=0;i<64;i++) { 1479 v = get_bits(&s->gb, 8); 1480 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; 1481 s->intra_matrix[j] = v; 1482 s->chroma_intra_matrix[j] = v; 1483 } 1484 } 1485 if (get_bits1(&s->gb)) { 1486 for(i=0;i<64;i++) { 1487 v = get_bits(&s->gb, 8); 1488 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; 1489 s->inter_matrix[j] = v; 1490 s->chroma_inter_matrix[j] = v; 1491 } 1492 } 1493 if (get_bits1(&s->gb)) { 1494 for(i=0;i<64;i++) { 1495 v = get_bits(&s->gb, 8); 1496 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; 1497 s->chroma_intra_matrix[j] = v; 1498 } 1499 } 1500 if (get_bits1(&s->gb)) { 1501 for(i=0;i<64;i++) { 1502 v = get_bits(&s->gb, 8); 1503 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; 1504 s->chroma_inter_matrix[j] = v; 1505 } 1506 } 1507} 1508 1509static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1) 1510{ 1511 MpegEncContext *s= &s1->mpeg_enc_ctx; 1512 1513 s->full_pel[0] = s->full_pel[1] = 0; 1514 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4); 1515 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4); 1516 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4); 1517 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4); 1518 if(!s->pict_type && s1->mpeg_enc_ctx_allocated){ 1519 av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n"); 1520 if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){ 1521 if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15) 1522 s->pict_type= FF_I_TYPE; 1523 else 1524 s->pict_type= FF_P_TYPE; 1525 }else 1526 s->pict_type= FF_B_TYPE; 1527 s->current_picture.pict_type= s->pict_type; 1528 s->current_picture.key_frame= s->pict_type == FF_I_TYPE; 1529 s->first_slice= 1; 1530 } 1531 s->intra_dc_precision = get_bits(&s->gb, 2); 1532 s->picture_structure = get_bits(&s->gb, 2); 1533 s->top_field_first = get_bits1(&s->gb); 1534 s->frame_pred_frame_dct = get_bits1(&s->gb); 1535 s->concealment_motion_vectors = get_bits1(&s->gb); 1536 s->q_scale_type = get_bits1(&s->gb); 1537 s->intra_vlc_format = get_bits1(&s->gb); 1538 s->alternate_scan = get_bits1(&s->gb); 1539 s->repeat_first_field = get_bits1(&s->gb); 1540 s->chroma_420_type = get_bits1(&s->gb); 1541 s->progressive_frame = get_bits1(&s->gb); 1542 1543 if(s->picture_structure == PICT_FRAME){ 1544 s->first_field=0; 1545 s->v_edge_pos= 16*s->mb_height; 1546 }else{ 1547 s->first_field ^= 1; 1548 s->v_edge_pos= 8*s->mb_height; 1549 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height); 1550 } 1551 1552 if(s->alternate_scan){ 1553 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan); 1554 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan); 1555 }else{ 1556 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct); 1557 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct); 1558 } 1559 1560 /* composite display not parsed */ 1561 dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision); 1562 dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure); 1563 dprintf(s->avctx, "top field first=%d\n", s->top_field_first); 1564 dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field); 1565 dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors); 1566 dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format); 1567 dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan); 1568 dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct); 1569 dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame); 1570} 1571 1572static void mpeg_decode_extension(AVCodecContext *avctx, 1573 const uint8_t *buf, int buf_size) 1574{ 1575 Mpeg1Context *s1 = avctx->priv_data; 1576 MpegEncContext *s = &s1->mpeg_enc_ctx; 1577 int ext_type; 1578 1579 init_get_bits(&s->gb, buf, buf_size*8); 1580 1581 ext_type = get_bits(&s->gb, 4); 1582 switch(ext_type) { 1583 case 0x1: 1584 mpeg_decode_sequence_extension(s1); 1585 break; 1586 case 0x2: 1587 mpeg_decode_sequence_display_extension(s1); 1588 break; 1589 case 0x3: 1590 mpeg_decode_quant_matrix_extension(s); 1591 break; 1592 case 0x7: 1593 mpeg_decode_picture_display_extension(s1); 1594 break; 1595 case 0x8: 1596 mpeg_decode_picture_coding_extension(s1); 1597 break; 1598 } 1599} 1600 1601static void exchange_uv(MpegEncContext *s){ 1602 DCTELEM (*tmp)[64]; 1603 1604 tmp = s->pblocks[4]; 1605 s->pblocks[4] = s->pblocks[5]; 1606 s->pblocks[5] = tmp; 1607} 1608 1609static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){ 1610 AVCodecContext *avctx= s->avctx; 1611 Mpeg1Context *s1 = (Mpeg1Context*)s; 1612 1613 /* start frame decoding */ 1614 if(s->first_field || s->picture_structure==PICT_FRAME){ 1615 if(MPV_frame_start(s, avctx) < 0) 1616 return -1; 1617 1618 ff_er_frame_start(s); 1619 1620 /* first check if we must repeat the frame */ 1621 s->current_picture_ptr->repeat_pict = 0; 1622 if (s->repeat_first_field) { 1623 if (s->progressive_sequence) { 1624 if (s->top_field_first) 1625 s->current_picture_ptr->repeat_pict = 4; 1626 else 1627 s->current_picture_ptr->repeat_pict = 2; 1628 } else if (s->progressive_frame) { 1629 s->current_picture_ptr->repeat_pict = 1; 1630 } 1631 } 1632 1633 *s->current_picture_ptr->pan_scan= s1->pan_scan; 1634 }else{ //second field 1635 int i; 1636 1637 if(!s->current_picture_ptr){ 1638 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n"); 1639 return -1; 1640 } 1641 1642 for(i=0; i<4; i++){ 1643 s->current_picture.data[i] = s->current_picture_ptr->data[i]; 1644 if(s->picture_structure == PICT_BOTTOM_FIELD){ 1645 s->current_picture.data[i] += s->current_picture_ptr->linesize[i]; 1646 } 1647 } 1648 } 1649 1650 if (avctx->hwaccel) { 1651 if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0) 1652 return -1; 1653 } 1654 1655// MPV_frame_start will call this function too, 1656// but we need to call it on every field 1657 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration) 1658 if(ff_xvmc_field_start(s,avctx) < 0) 1659 return -1; 1660 1661 return 0; 1662} 1663 1664#define DECODE_SLICE_ERROR -1 1665#define DECODE_SLICE_OK 0 1666 1667/** 1668 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode 1669 * @return DECODE_SLICE_ERROR if the slice is damaged<br> 1670 * DECODE_SLICE_OK if this slice is ok<br> 1671 */ 1672static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y, 1673 const uint8_t **buf, int buf_size) 1674{ 1675 MpegEncContext *s = &s1->mpeg_enc_ctx; 1676 AVCodecContext *avctx= s->avctx; 1677 const int field_pic= s->picture_structure != PICT_FRAME; 1678 const int lowres= s->avctx->lowres; 1679 1680 s->resync_mb_x= 1681 s->resync_mb_y= -1; 1682 1683 if (mb_y<<field_pic >= s->mb_height){ 1684 av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height); 1685 return -1; 1686 } 1687 1688 init_get_bits(&s->gb, *buf, buf_size*8); 1689 1690 ff_mpeg1_clean_buffers(s); 1691 s->interlaced_dct = 0; 1692 1693 s->qscale = get_qscale(s); 1694 1695 if(s->qscale == 0){ 1696 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n"); 1697 return -1; 1698 } 1699 1700 /* extra slice info */ 1701 while (get_bits1(&s->gb) != 0) { 1702 skip_bits(&s->gb, 8); 1703 } 1704 1705 s->mb_x=0; 1706 1707 if (avctx->hwaccel) { 1708 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */ 1709 int start_code = -1; 1710 buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code); 1711 if (buf_end < *buf + buf_size) 1712 buf_end -= 4; 1713 s->mb_y = mb_y; 1714 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0) 1715 return DECODE_SLICE_ERROR; 1716 *buf = buf_end; 1717 return DECODE_SLICE_OK; 1718 } 1719 1720 for(;;) { 1721 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2); 1722 if (code < 0){ 1723 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n"); 1724 return -1; 1725 } 1726 if (code >= 33) { 1727 if (code == 33) { 1728 s->mb_x += 33; 1729 } 1730 /* otherwise, stuffing, nothing to do */ 1731 } else { 1732 s->mb_x += code; 1733 break; 1734 } 1735 } 1736 if(s->mb_x >= (unsigned)s->mb_width){ 1737 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n"); 1738 return -1; 1739 } 1740 1741 s->resync_mb_x= s->mb_x; 1742 s->resync_mb_y= s->mb_y= mb_y; 1743 s->mb_skip_run= 0; 1744 ff_init_block_index(s); 1745 1746 if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) { 1747 if(s->avctx->debug&FF_DEBUG_PICT_INFO){ 1748 av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n", 1749 s->qscale, s->mpeg_f_code[0][0],s->mpeg_f_code[0][1],s->mpeg_f_code[1][0],s->mpeg_f_code[1][1], 1750 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")), 1751 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"", 1752 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors, 1753 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :""); 1754 } 1755 } 1756 1757 for(;;) { 1758 //If 1, we memcpy blocks in xvmcvideo. 1759 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) 1760 ff_xvmc_init_block(s);//set s->block 1761 1762 if(mpeg_decode_mb(s, s->block) < 0) 1763 return -1; 1764 1765 if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs 1766 const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride; 1767 int xy = s->mb_x*2 + s->mb_y*2*wrap; 1768 int motion_x, motion_y, dir, i; 1769 if(field_pic && !s->first_field) 1770 xy += wrap/2; 1771 1772 for(i=0; i<2; i++){ 1773 for(dir=0; dir<2; dir++){ 1774 if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) { 1775 motion_x = motion_y = 0; 1776 }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){ 1777 motion_x = s->mv[dir][0][0]; 1778 motion_y = s->mv[dir][0][1]; 1779 } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ { 1780 motion_x = s->mv[dir][i][0]; 1781 motion_y = s->mv[dir][i][1]; 1782 } 1783 1784 s->current_picture.motion_val[dir][xy ][0] = motion_x; 1785 s->current_picture.motion_val[dir][xy ][1] = motion_y; 1786 s->current_picture.motion_val[dir][xy + 1][0] = motion_x; 1787 s->current_picture.motion_val[dir][xy + 1][1] = motion_y; 1788 s->current_picture.ref_index [dir][xy ]= 1789 s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i]; 1790 assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1); 1791 } 1792 xy += wrap; 1793 } 1794 } 1795 1796 s->dest[0] += 16 >> lowres; 1797 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift; 1798 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift; 1799 1800 MPV_decode_mb(s, s->block); 1801 1802 if (++s->mb_x >= s->mb_width) { 1803 const int mb_size= 16>>s->avctx->lowres; 1804 1805 ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size); 1806 1807 s->mb_x = 0; 1808 s->mb_y++; 1809 1810 if(s->mb_y<<field_pic >= s->mb_height){ 1811 int left= s->gb.size_in_bits - get_bits_count(&s->gb); 1812 int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5 1813 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0 1814 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/; 1815 1816 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) 1817 || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){ 1818 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23))); 1819 return -1; 1820 }else 1821 goto eos; 1822 } 1823 1824 ff_init_block_index(s); 1825 } 1826 1827 /* skip mb handling */ 1828 if (s->mb_skip_run == -1) { 1829 /* read increment again */ 1830 s->mb_skip_run = 0; 1831 for(;;) { 1832 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2); 1833 if (code < 0){ 1834 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n"); 1835 return -1; 1836 } 1837 if (code >= 33) { 1838 if (code == 33) { 1839 s->mb_skip_run += 33; 1840 }else if(code == 35){ 1841 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){ 1842 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n"); 1843 return -1; 1844 } 1845 goto eos; /* end of slice */ 1846 } 1847 /* otherwise, stuffing, nothing to do */ 1848 } else { 1849 s->mb_skip_run += code; 1850 break; 1851 } 1852 } 1853 if(s->mb_skip_run){ 1854 int i; 1855 if(s->pict_type == FF_I_TYPE){ 1856 av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y); 1857 return -1; 1858 } 1859 1860 /* skip mb */ 1861 s->mb_intra = 0; 1862 for(i=0;i<12;i++) 1863 s->block_last_index[i] = -1; 1864 if(s->picture_structure == PICT_FRAME) 1865 s->mv_type = MV_TYPE_16X16; 1866 else 1867 s->mv_type = MV_TYPE_FIELD; 1868 if (s->pict_type == FF_P_TYPE) { 1869 /* if P type, zero motion vector is implied */ 1870 s->mv_dir = MV_DIR_FORWARD; 1871 s->mv[0][0][0] = s->mv[0][0][1] = 0; 1872 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0; 1873 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0; 1874 s->field_select[0][0]= s->picture_structure - 1; 1875 } else { 1876 /* if B type, reuse previous vectors and directions */ 1877 s->mv[0][0][0] = s->last_mv[0][0][0]; 1878 s->mv[0][0][1] = s->last_mv[0][0][1]; 1879 s->mv[1][0][0] = s->last_mv[1][0][0]; 1880 s->mv[1][0][1] = s->last_mv[1][0][1]; 1881 } 1882 } 1883 } 1884 } 1885eos: // end of slice 1886 *buf += (get_bits_count(&s->gb)-1)/8; 1887//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y); 1888 return 0; 1889} 1890 1891static int slice_decode_thread(AVCodecContext *c, void *arg){ 1892 MpegEncContext *s= *(void**)arg; 1893 const uint8_t *buf= s->gb.buffer; 1894 int mb_y= s->start_mb_y; 1895 1896 s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width; 1897 1898 for(;;){ 1899 uint32_t start_code; 1900 int ret; 1901 1902 ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf); 1903 emms_c(); 1904//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n", 1905//ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count); 1906 if(ret < 0){ 1907 if(s->resync_mb_x>=0 && s->resync_mb_y>=0) 1908 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR); 1909 }else{ 1910 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END); 1911 } 1912 1913 if(s->mb_y == s->end_mb_y) 1914 return 0; 1915 1916 start_code= -1; 1917 buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code); 1918 mb_y= start_code - SLICE_MIN_START_CODE; 1919 if(mb_y < 0 || mb_y >= s->end_mb_y) 1920 return -1; 1921 } 1922 1923 return 0; //not reached 1924} 1925 1926/** 1927 * Handles slice ends. 1928 * @return 1 if it seems to be the last slice 1929 */ 1930static int slice_end(AVCodecContext *avctx, AVFrame *pict) 1931{ 1932 Mpeg1Context *s1 = avctx->priv_data; 1933 MpegEncContext *s = &s1->mpeg_enc_ctx; 1934 1935 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr) 1936 return 0; 1937 1938 if (s->avctx->hwaccel) { 1939 if (s->avctx->hwaccel->end_frame(s->avctx) < 0) 1940 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n"); 1941 } 1942 1943 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration) 1944 ff_xvmc_field_end(s); 1945 1946 /* end of slice reached */ 1947 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) { 1948 /* end of image */ 1949 1950 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2; 1951 1952 ff_er_frame_end(s); 1953 1954 MPV_frame_end(s); 1955 1956 if (s->pict_type == FF_B_TYPE || s->low_delay) { 1957 *pict= *(AVFrame*)s->current_picture_ptr; 1958 ff_print_debug_info(s, pict); 1959 } else { 1960 s->picture_number++; 1961 /* latency of 1 frame for I- and P-frames */ 1962 /* XXX: use another variable than picture_number */ 1963 if (s->last_picture_ptr != NULL) { 1964 *pict= *(AVFrame*)s->last_picture_ptr; 1965 ff_print_debug_info(s, pict); 1966 } 1967 } 1968 1969 return 1; 1970 } else { 1971 return 0; 1972 } 1973} 1974 1975static int mpeg1_decode_sequence(AVCodecContext *avctx, 1976 const uint8_t *buf, int buf_size) 1977{ 1978 Mpeg1Context *s1 = avctx->priv_data; 1979 MpegEncContext *s = &s1->mpeg_enc_ctx; 1980 int width,height; 1981 int i, v, j; 1982 1983 init_get_bits(&s->gb, buf, buf_size*8); 1984 1985 width = get_bits(&s->gb, 12); 1986 height = get_bits(&s->gb, 12); 1987 if (width <= 0 || height <= 0) 1988 return -1; 1989 s->aspect_ratio_info= get_bits(&s->gb, 4); 1990 if (s->aspect_ratio_info == 0) { 1991 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n"); 1992 if (avctx->error_recognition >= FF_ER_COMPLIANT) 1993 return -1; 1994 } 1995 s->frame_rate_index = get_bits(&s->gb, 4); 1996 if (s->frame_rate_index == 0 || s->frame_rate_index > 13) 1997 return -1; 1998 s->bit_rate = get_bits(&s->gb, 18) * 400; 1999 if (get_bits1(&s->gb) == 0) /* marker */ 2000 return -1; 2001 s->width = width; 2002 s->height = height; 2003 2004 s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16; 2005 skip_bits(&s->gb, 1); 2006 2007 /* get matrix */ 2008 if (get_bits1(&s->gb)) { 2009 for(i=0;i<64;i++) { 2010 v = get_bits(&s->gb, 8); 2011 if(v==0){ 2012 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n"); 2013 return -1; 2014 } 2015 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; 2016 s->intra_matrix[j] = v; 2017 s->chroma_intra_matrix[j] = v; 2018 } 2019#ifdef DEBUG 2020 dprintf(s->avctx, "intra matrix present\n"); 2021 for(i=0;i<64;i++) 2022 dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]); 2023 dprintf(s->avctx, "\n"); 2024#endif 2025 } else { 2026 for(i=0;i<64;i++) { 2027 j = s->dsp.idct_permutation[i]; 2028 v = ff_mpeg1_default_intra_matrix[i]; 2029 s->intra_matrix[j] = v; 2030 s->chroma_intra_matrix[j] = v; 2031 } 2032 } 2033 if (get_bits1(&s->gb)) { 2034 for(i=0;i<64;i++) { 2035 v = get_bits(&s->gb, 8); 2036 if(v==0){ 2037 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n"); 2038 return -1; 2039 } 2040 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; 2041 s->inter_matrix[j] = v; 2042 s->chroma_inter_matrix[j] = v; 2043 } 2044#ifdef DEBUG 2045 dprintf(s->avctx, "non-intra matrix present\n"); 2046 for(i=0;i<64;i++) 2047 dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]); 2048 dprintf(s->avctx, "\n"); 2049#endif 2050 } else { 2051 for(i=0;i<64;i++) { 2052 int j= s->dsp.idct_permutation[i]; 2053 v = ff_mpeg1_default_non_intra_matrix[i]; 2054 s->inter_matrix[j] = v; 2055 s->chroma_inter_matrix[j] = v; 2056 } 2057 } 2058 2059 if(show_bits(&s->gb, 23) != 0){ 2060 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n"); 2061 return -1; 2062 } 2063 2064 /* we set MPEG-2 parameters so that it emulates MPEG-1 */ 2065 s->progressive_sequence = 1; 2066 s->progressive_frame = 1; 2067 s->picture_structure = PICT_FRAME; 2068 s->frame_pred_frame_dct = 1; 2069 s->chroma_format = 1; 2070 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO; 2071 avctx->sub_id = 1; /* indicates MPEG-1 */ 2072 s->out_format = FMT_MPEG1; 2073 s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER 2074 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1; 2075 2076 if(s->avctx->debug & FF_DEBUG_PICT_INFO) 2077 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n", 2078 s->avctx->rc_buffer_size, s->bit_rate); 2079 2080 return 0; 2081} 2082 2083static int vcr2_init_sequence(AVCodecContext *avctx) 2084{ 2085 Mpeg1Context *s1 = avctx->priv_data; 2086 MpegEncContext *s = &s1->mpeg_enc_ctx; 2087 int i, v; 2088 2089 /* start new MPEG-1 context decoding */ 2090 s->out_format = FMT_MPEG1; 2091 if (s1->mpeg_enc_ctx_allocated) { 2092 MPV_common_end(s); 2093 } 2094 s->width = avctx->coded_width; 2095 s->height = avctx->coded_height; 2096 avctx->has_b_frames= 0; //true? 2097 s->low_delay= 1; 2098 2099 avctx->pix_fmt = mpeg_get_pixelformat(avctx); 2100 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt); 2101 2102 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel || 2103 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU ) 2104 if( avctx->idct_algo == FF_IDCT_AUTO ) 2105 avctx->idct_algo = FF_IDCT_SIMPLE; 2106 2107 if (MPV_common_init(s) < 0) 2108 return -1; 2109 exchange_uv(s);//common init reset pblocks, so we swap them here 2110 s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB 2111 s1->mpeg_enc_ctx_allocated = 1; 2112 2113 for(i=0;i<64;i++) { 2114 int j= s->dsp.idct_permutation[i]; 2115 v = ff_mpeg1_default_intra_matrix[i]; 2116 s->intra_matrix[j] = v; 2117 s->chroma_intra_matrix[j] = v; 2118 2119 v = ff_mpeg1_default_non_intra_matrix[i]; 2120 s->inter_matrix[j] = v; 2121 s->chroma_inter_matrix[j] = v; 2122 } 2123 2124 s->progressive_sequence = 1; 2125 s->progressive_frame = 1; 2126 s->picture_structure = PICT_FRAME; 2127 s->frame_pred_frame_dct = 1; 2128 s->chroma_format = 1; 2129 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO; 2130 avctx->sub_id = 2; /* indicates MPEG-2 */ 2131 return 0; 2132} 2133 2134 2135static void mpeg_decode_user_data(AVCodecContext *avctx, 2136 const uint8_t *buf, int buf_size) 2137{ 2138 const uint8_t *p; 2139 int len, flags; 2140 p = buf; 2141 len = buf_size; 2142 2143 /* we parse the DTG active format information */ 2144 if (len >= 5 && 2145 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') { 2146 flags = p[4]; 2147 p += 5; 2148 len -= 5; 2149 if (flags & 0x80) { 2150 /* skip event id */ 2151 if (len < 2) 2152 return; 2153 p += 2; 2154 len -= 2; 2155 } 2156 if (flags & 0x40) { 2157 if (len < 1) 2158 return; 2159 avctx->dtg_active_format = p[0] & 0x0f; 2160 } 2161 } 2162} 2163 2164static void mpeg_decode_gop(AVCodecContext *avctx, 2165 const uint8_t *buf, int buf_size){ 2166 Mpeg1Context *s1 = avctx->priv_data; 2167 MpegEncContext *s = &s1->mpeg_enc_ctx; 2168 2169 int drop_frame_flag; 2170 int time_code_hours, time_code_minutes; 2171 int time_code_seconds, time_code_pictures; 2172 int closed_gop, broken_link; 2173 2174 init_get_bits(&s->gb, buf, buf_size*8); 2175 2176 drop_frame_flag = get_bits1(&s->gb); 2177 2178 time_code_hours=get_bits(&s->gb,5); 2179 time_code_minutes = get_bits(&s->gb,6); 2180 skip_bits1(&s->gb);//marker bit 2181 time_code_seconds = get_bits(&s->gb,6); 2182 time_code_pictures = get_bits(&s->gb,6); 2183 2184 closed_gop = get_bits1(&s->gb); 2185 /*broken_link indicate that after editing the 2186 reference frames of the first B-Frames after GOP I-Frame 2187 are missing (open gop)*/ 2188 broken_link = get_bits1(&s->gb); 2189 2190 if(s->avctx->debug & FF_DEBUG_PICT_INFO) 2191 av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n", 2192 time_code_hours, time_code_minutes, time_code_seconds, 2193 time_code_pictures, closed_gop, broken_link); 2194} 2195/** 2196 * Finds the end of the current frame in the bitstream. 2197 * @return the position of the first byte of the next frame, or -1 2198 */ 2199int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) 2200{ 2201 int i; 2202 uint32_t state= pc->state; 2203 2204 /* EOF considered as end of frame */ 2205 if (buf_size == 0) 2206 return 0; 2207 2208/* 2209 0 frame start -> 1/4 2210 1 first_SEQEXT -> 0/2 2211 2 first field start -> 3/0 2212 3 second_SEQEXT -> 2/0 2213 4 searching end 2214*/ 2215 2216 for(i=0; i<buf_size; i++){ 2217 assert(pc->frame_start_found>=0 && pc->frame_start_found<=4); 2218 if(pc->frame_start_found&1){ 2219 if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80) 2220 pc->frame_start_found--; 2221 else if(state == EXT_START_CODE+2){ 2222 if((buf[i]&3) == 3) pc->frame_start_found= 0; 2223 else pc->frame_start_found= (pc->frame_start_found+1)&3; 2224 } 2225 state++; 2226 }else{ 2227 i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1; 2228 if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){ 2229 i++; 2230 pc->frame_start_found=4; 2231 } 2232 if(state == SEQ_END_CODE){ 2233 pc->state=-1; 2234 return i+1; 2235 } 2236 if(pc->frame_start_found==2 && state == SEQ_START_CODE) 2237 pc->frame_start_found= 0; 2238 if(pc->frame_start_found<4 && state == EXT_START_CODE) 2239 pc->frame_start_found++; 2240 if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){ 2241 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){ 2242 pc->frame_start_found=0; 2243 pc->state=-1; 2244 return i-3; 2245 } 2246 } 2247 } 2248 } 2249 pc->state= state; 2250 return END_NOT_FOUND; 2251} 2252 2253static int decode_chunks(AVCodecContext *avctx, 2254 AVFrame *picture, int *data_size, 2255 const uint8_t *buf, int buf_size); 2256 2257/* handle buffering and image synchronisation */ 2258static int mpeg_decode_frame(AVCodecContext *avctx, 2259 void *data, int *data_size, 2260 const uint8_t *buf, int buf_size) 2261{ 2262 Mpeg1Context *s = avctx->priv_data; 2263 AVFrame *picture = data; 2264 MpegEncContext *s2 = &s->mpeg_enc_ctx; 2265 dprintf(avctx, "fill_buffer\n"); 2266 2267 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) { 2268 /* special case for last picture */ 2269 if (s2->low_delay==0 && s2->next_picture_ptr) { 2270 *picture= *(AVFrame*)s2->next_picture_ptr; 2271 s2->next_picture_ptr= NULL; 2272 2273 *data_size = sizeof(AVFrame); 2274 } 2275 return buf_size; 2276 } 2277 2278 if(s2->flags&CODEC_FLAG_TRUNCATED){ 2279 int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size); 2280 2281 if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 ) 2282 return buf_size; 2283 } 2284 2285#if 0 2286 if (s->repeat_field % 2 == 1) { 2287 s->repeat_field++; 2288 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number, 2289 // s2->picture_number, s->repeat_field); 2290 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) { 2291 *data_size = sizeof(AVPicture); 2292 goto the_end; 2293 } 2294 } 2295#endif 2296 2297 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2")) 2298 vcr2_init_sequence(avctx); 2299 2300 s->slice_count= 0; 2301 2302 if(avctx->extradata && !avctx->frame_number) 2303 decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size); 2304 2305 return decode_chunks(avctx, picture, data_size, buf, buf_size); 2306} 2307 2308static int decode_chunks(AVCodecContext *avctx, 2309 AVFrame *picture, int *data_size, 2310 const uint8_t *buf, int buf_size) 2311{ 2312 Mpeg1Context *s = avctx->priv_data; 2313 MpegEncContext *s2 = &s->mpeg_enc_ctx; 2314 const uint8_t *buf_ptr = buf; 2315 const uint8_t *buf_end = buf + buf_size; 2316 int ret, input_size; 2317 2318 for(;;) { 2319 /* find next start code */ 2320 uint32_t start_code = -1; 2321 buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code); 2322 if (start_code > 0x1ff){ 2323 if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){ 2324 if(avctx->thread_count > 1){ 2325 int i; 2326 2327 avctx->execute(avctx, slice_decode_thread, (void**)&(s2->thread_context[0]), NULL, s->slice_count, sizeof(void*)); 2328 for(i=0; i<s->slice_count; i++) 2329 s2->error_count += s2->thread_context[i]->error_count; 2330 } 2331 2332 if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) 2333 ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count); 2334 2335 if (slice_end(avctx, picture)) { 2336 if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice 2337 *data_size = sizeof(AVPicture); 2338 } 2339 } 2340 s2->pict_type= 0; 2341 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index); 2342 } 2343 2344 input_size = buf_end - buf_ptr; 2345 2346 if(avctx->debug & FF_DEBUG_STARTCODE){ 2347 av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size); 2348 } 2349 2350 /* prepare data for next start code */ 2351 switch(start_code) { 2352 case SEQ_START_CODE: 2353 mpeg1_decode_sequence(avctx, buf_ptr, 2354 input_size); 2355 break; 2356 2357 case PICTURE_START_CODE: 2358 /* we have a complete image: we try to decompress it */ 2359 if(mpeg1_decode_picture(avctx, 2360 buf_ptr, input_size) < 0) 2361 s2->pict_type=0; 2362 break; 2363 case EXT_START_CODE: 2364 mpeg_decode_extension(avctx, 2365 buf_ptr, input_size); 2366 break; 2367 case USER_START_CODE: 2368 mpeg_decode_user_data(avctx, 2369 buf_ptr, input_size); 2370 break; 2371 case GOP_START_CODE: 2372 s2->first_field=0; 2373 mpeg_decode_gop(avctx, 2374 buf_ptr, input_size); 2375 break; 2376 default: 2377 if (start_code >= SLICE_MIN_START_CODE && 2378 start_code <= SLICE_MAX_START_CODE) { 2379 int mb_y= start_code - SLICE_MIN_START_CODE; 2380 2381 if(s2->last_picture_ptr==NULL){ 2382 /* Skip B-frames if we do not have reference frames. */ 2383 if(s2->pict_type==FF_B_TYPE) break; 2384 } 2385 if(s2->next_picture_ptr==NULL){ 2386 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */ 2387 if(s2->pict_type==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break; 2388 } 2389 /* Skip B-frames if we are in a hurry. */ 2390 if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break; 2391 if( (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE) 2392 ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE) 2393 || avctx->skip_frame >= AVDISCARD_ALL) 2394 break; 2395 /* Skip everything if we are in a hurry>=5. */ 2396 if(avctx->hurry_up>=5) break; 2397 2398 if (!s->mpeg_enc_ctx_allocated) break; 2399 2400 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){ 2401 if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom) 2402 break; 2403 } 2404 2405 if(!s2->pict_type){ 2406 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n"); 2407 break; 2408 } 2409 2410 if(s2->first_slice){ 2411 s2->first_slice=0; 2412 if(mpeg_field_start(s2, buf, buf_size) < 0) 2413 return -1; 2414 } 2415 if(!s2->current_picture_ptr){ 2416 av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n"); 2417 return -1; 2418 } 2419 2420 if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) { 2421 s->slice_count++; 2422 break; 2423 } 2424 2425 if(avctx->thread_count > 1){ 2426 int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count; 2427 if(threshold <= mb_y){ 2428 MpegEncContext *thread_context= s2->thread_context[s->slice_count]; 2429 2430 thread_context->start_mb_y= mb_y; 2431 thread_context->end_mb_y = s2->mb_height; 2432 if(s->slice_count){ 2433 s2->thread_context[s->slice_count-1]->end_mb_y= mb_y; 2434 ff_update_duplicate_context(thread_context, s2); 2435 } 2436 init_get_bits(&thread_context->gb, buf_ptr, input_size*8); 2437 s->slice_count++; 2438 } 2439 buf_ptr += 2; //FIXME add minimum number of bytes per slice 2440 }else{ 2441 ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size); 2442 emms_c(); 2443 2444 if(ret < 0){ 2445 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0) 2446 ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, AC_ERROR|DC_ERROR|MV_ERROR); 2447 }else{ 2448 ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, AC_END|DC_END|MV_END); 2449 } 2450 } 2451 } 2452 break; 2453 } 2454 } 2455} 2456 2457static int mpeg_decode_end(AVCodecContext *avctx) 2458{ 2459 Mpeg1Context *s = avctx->priv_data; 2460 2461 if (s->mpeg_enc_ctx_allocated) 2462 MPV_common_end(&s->mpeg_enc_ctx); 2463 return 0; 2464} 2465 2466AVCodec mpeg1video_decoder = { 2467 "mpeg1video", 2468 CODEC_TYPE_VIDEO, 2469 CODEC_ID_MPEG1VIDEO, 2470 sizeof(Mpeg1Context), 2471 mpeg_decode_init, 2472 NULL, 2473 mpeg_decode_end, 2474 mpeg_decode_frame, 2475 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, 2476 .flush= ff_mpeg_flush, 2477 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"), 2478}; 2479 2480AVCodec mpeg2video_decoder = { 2481 "mpeg2video", 2482 CODEC_TYPE_VIDEO, 2483 CODEC_ID_MPEG2VIDEO, 2484 sizeof(Mpeg1Context), 2485 mpeg_decode_init, 2486 NULL, 2487 mpeg_decode_end, 2488 mpeg_decode_frame, 2489 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, 2490 .flush= ff_mpeg_flush, 2491 .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"), 2492}; 2493 2494//legacy decoder 2495AVCodec mpegvideo_decoder = { 2496 "mpegvideo", 2497 CODEC_TYPE_VIDEO, 2498 CODEC_ID_MPEG2VIDEO, 2499 sizeof(Mpeg1Context), 2500 mpeg_decode_init, 2501 NULL, 2502 mpeg_decode_end, 2503 mpeg_decode_frame, 2504 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, 2505 .flush= ff_mpeg_flush, 2506 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"), 2507}; 2508 2509#if CONFIG_MPEG_XVMC_DECODER 2510static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){ 2511 if( avctx->thread_count > 1) 2512 return -1; 2513 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) ) 2514 return -1; 2515 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){ 2516 dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n"); 2517 } 2518 mpeg_decode_init(avctx); 2519 2520 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT; 2521 avctx->xvmc_acceleration = 2;//2 - the blocks are packed! 2522 2523 return 0; 2524} 2525 2526AVCodec mpeg_xvmc_decoder = { 2527 "mpegvideo_xvmc", 2528 CODEC_TYPE_VIDEO, 2529 CODEC_ID_MPEG2VIDEO_XVMC, 2530 sizeof(Mpeg1Context), 2531 mpeg_mc_decode_init, 2532 NULL, 2533 mpeg_decode_end, 2534 mpeg_decode_frame, 2535 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY, 2536 .flush= ff_mpeg_flush, 2537 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"), 2538}; 2539 2540#endif 2541 2542#if CONFIG_MPEG_VDPAU_DECODER 2543AVCodec mpeg_vdpau_decoder = { 2544 "mpegvideo_vdpau", 2545 CODEC_TYPE_VIDEO, 2546 CODEC_ID_MPEG2VIDEO, 2547 sizeof(Mpeg1Context), 2548 mpeg_decode_init, 2549 NULL, 2550 mpeg_decode_end, 2551 mpeg_decode_frame, 2552 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY, 2553 .flush= ff_mpeg_flush, 2554 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"), 2555}; 2556#endif 2557 2558#if CONFIG_MPEG1_VDPAU_DECODER 2559AVCodec mpeg1_vdpau_decoder = { 2560 "mpeg1video_vdpau", 2561 CODEC_TYPE_VIDEO, 2562 CODEC_ID_MPEG1VIDEO, 2563 sizeof(Mpeg1Context), 2564 mpeg_decode_init, 2565 NULL, 2566 mpeg_decode_end, 2567 mpeg_decode_frame, 2568 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY, 2569 .flush= ff_mpeg_flush, 2570 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"), 2571}; 2572#endif 2573 2574