1/* 2 * H.263 decoder 3 * Copyright (c) 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 * H.263 decoder. 26 */ 27 28#include "internal.h" 29#include "avcodec.h" 30#include "dsputil.h" 31#include "mpegvideo.h" 32#include "h263.h" 33#include "h263_parser.h" 34#include "mpeg4video_parser.h" 35#include "msmpeg4.h" 36#include "vdpau_internal.h" 37#include "flv.h" 38#include "mpeg4video.h" 39 40//#define DEBUG 41//#define PRINT_FRAME_TIME 42 43av_cold int ff_h263_decode_init(AVCodecContext *avctx) 44{ 45 MpegEncContext *s = avctx->priv_data; 46 47 s->avctx = avctx; 48 s->out_format = FMT_H263; 49 50 s->width = avctx->coded_width; 51 s->height = avctx->coded_height; 52 s->workaround_bugs= avctx->workaround_bugs; 53 54 // set defaults 55 MPV_decode_defaults(s); 56 s->quant_precision=5; 57 s->decode_mb= ff_h263_decode_mb; 58 s->low_delay= 1; 59 avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts); 60 s->unrestricted_mv= 1; 61 62 /* select sub codec */ 63 switch(avctx->codec->id) { 64 case CODEC_ID_H263: 65 s->unrestricted_mv= 0; 66 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER; 67 break; 68 case CODEC_ID_MPEG4: 69 break; 70 case CODEC_ID_MSMPEG4V1: 71 s->h263_msmpeg4 = 1; 72 s->h263_pred = 1; 73 s->msmpeg4_version=1; 74 break; 75 case CODEC_ID_MSMPEG4V2: 76 s->h263_msmpeg4 = 1; 77 s->h263_pred = 1; 78 s->msmpeg4_version=2; 79 break; 80 case CODEC_ID_MSMPEG4V3: 81 s->h263_msmpeg4 = 1; 82 s->h263_pred = 1; 83 s->msmpeg4_version=3; 84 break; 85 case CODEC_ID_WMV1: 86 s->h263_msmpeg4 = 1; 87 s->h263_pred = 1; 88 s->msmpeg4_version=4; 89 break; 90 case CODEC_ID_WMV2: 91 s->h263_msmpeg4 = 1; 92 s->h263_pred = 1; 93 s->msmpeg4_version=5; 94 break; 95 case CODEC_ID_VC1: 96 case CODEC_ID_WMV3: 97 s->h263_msmpeg4 = 1; 98 s->h263_pred = 1; 99 s->msmpeg4_version=6; 100 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; 101 break; 102 case CODEC_ID_H263I: 103 break; 104 case CODEC_ID_FLV1: 105 s->h263_flv = 1; 106 break; 107 default: 108 return -1; 109 } 110 s->codec_id= avctx->codec->id; 111 avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt); 112 113 /* for h263, we allocate the images after having read the header */ 114 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4) 115 if (MPV_common_init(s) < 0) 116 return -1; 117 118 h263_decode_init_vlc(s); 119 120 return 0; 121} 122 123av_cold int ff_h263_decode_end(AVCodecContext *avctx) 124{ 125 MpegEncContext *s = avctx->priv_data; 126 127 MPV_common_end(s); 128 return 0; 129} 130 131/** 132 * returns the number of bytes consumed for building the current frame 133 */ 134static int get_consumed_bytes(MpegEncContext *s, int buf_size){ 135 int pos= (get_bits_count(&s->gb)+7)>>3; 136 137 if(s->divx_packed || s->avctx->hwaccel){ 138 //we would have to scan through the whole buf to handle the weird reordering ... 139 return buf_size; 140 }else if(s->flags&CODEC_FLAG_TRUNCATED){ 141 pos -= s->parse_context.last_index; 142 if(pos<0) pos=0; // padding is not really read so this might be -1 143 return pos; 144 }else{ 145 if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...) 146 if(pos+10>buf_size) pos=buf_size; // oops ;) 147 148 return pos; 149 } 150} 151 152static int decode_slice(MpegEncContext *s){ 153 const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F; 154 const int mb_size= 16>>s->avctx->lowres; 155 s->last_resync_gb= s->gb; 156 s->first_slice_line= 1; 157 158 s->resync_mb_x= s->mb_x; 159 s->resync_mb_y= s->mb_y; 160 161 ff_set_qscale(s, s->qscale); 162 163 if (s->avctx->hwaccel) { 164 const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8; 165 const uint8_t *end = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end); 166 skip_bits_long(&s->gb, 8*(end - start)); 167 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start); 168 } 169 170 if(s->partitioned_frame){ 171 const int qscale= s->qscale; 172 173 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){ 174 if(ff_mpeg4_decode_partitions(s) < 0) 175 return -1; 176 } 177 178 /* restore variables which were modified */ 179 s->first_slice_line=1; 180 s->mb_x= s->resync_mb_x; 181 s->mb_y= s->resync_mb_y; 182 ff_set_qscale(s, qscale); 183 } 184 185 for(; s->mb_y < s->mb_height; s->mb_y++) { 186 /* per-row end of slice checks */ 187 if(s->msmpeg4_version){ 188 if(s->resync_mb_y + s->slice_height == s->mb_y){ 189 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); 190 191 return 0; 192 } 193 } 194 195 if(s->msmpeg4_version==1){ 196 s->last_dc[0]= 197 s->last_dc[1]= 198 s->last_dc[2]= 128; 199 } 200 201 ff_init_block_index(s); 202 for(; s->mb_x < s->mb_width; s->mb_x++) { 203 int ret; 204 205 ff_update_block_index(s); 206 207 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){ 208 s->first_slice_line=0; 209 } 210 211 /* DCT & quantize */ 212 213 s->mv_dir = MV_DIR_FORWARD; 214 s->mv_type = MV_TYPE_16X16; 215// s->mb_skipped = 0; 216//printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24)); 217 ret= s->decode_mb(s, s->block); 218 219 if (s->pict_type!=FF_B_TYPE) 220 ff_h263_update_motion_val(s); 221 222 if(ret<0){ 223 const int xy= s->mb_x + s->mb_y*s->mb_stride; 224 if(ret==SLICE_END){ 225 MPV_decode_mb(s, s->block); 226 if(s->loop_filter) 227 ff_h263_loop_filter(s); 228 229//printf("%d %d %d %06X\n", s->mb_x, s->mb_y, s->gb.size*8 - get_bits_count(&s->gb), show_bits(&s->gb, 24)); 230 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask); 231 232 s->padding_bug_score--; 233 234 if(++s->mb_x >= s->mb_width){ 235 s->mb_x=0; 236 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size); 237 s->mb_y++; 238 } 239 return 0; 240 }else if(ret==SLICE_NOEND){ 241 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy); 242 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)&part_mask); 243 return -1; 244 } 245 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy); 246 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)&part_mask); 247 248 return -1; 249 } 250 251 MPV_decode_mb(s, s->block); 252 if(s->loop_filter) 253 ff_h263_loop_filter(s); 254 } 255 256 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size); 257 258 s->mb_x= 0; 259 } 260 261 assert(s->mb_x==0 && s->mb_y==s->mb_height); 262 263 /* try to detect the padding bug */ 264 if( s->codec_id==CODEC_ID_MPEG4 265 && (s->workaround_bugs&FF_BUG_AUTODETECT) 266 && get_bits_left(&s->gb) >=0 267 && get_bits_left(&s->gb) < 48 268// && !s->resync_marker 269 && !s->data_partitioning){ 270 271 const int bits_count= get_bits_count(&s->gb); 272 const int bits_left = s->gb.size_in_bits - bits_count; 273 274 if(bits_left==0){ 275 s->padding_bug_score+=16; 276 } else if(bits_left != 1){ 277 int v= show_bits(&s->gb, 8); 278 v|= 0x7F >> (7-(bits_count&7)); 279 280 if(v==0x7F && bits_left<=8) 281 s->padding_bug_score--; 282 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16) 283 s->padding_bug_score+= 4; 284 else 285 s->padding_bug_score++; 286 } 287 } 288 289 if(s->workaround_bugs&FF_BUG_AUTODETECT){ 290 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/) 291 s->workaround_bugs |= FF_BUG_NO_PADDING; 292 else 293 s->workaround_bugs &= ~FF_BUG_NO_PADDING; 294 } 295 296 // handle formats which don't have unique end markers 297 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly 298 int left= get_bits_left(&s->gb); 299 int max_extra=7; 300 301 /* no markers in M$ crap */ 302 if(s->msmpeg4_version && s->pict_type==FF_I_TYPE) 303 max_extra+= 17; 304 305 /* buggy padding but the frame should still end approximately at the bitstream end */ 306 if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3) 307 max_extra+= 48; 308 else if((s->workaround_bugs&FF_BUG_NO_PADDING)) 309 max_extra+= 256*256*256*64; 310 311 if(left>max_extra){ 312 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24)); 313 } 314 else if(left<0){ 315 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left); 316 }else 317 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); 318 319 return 0; 320 } 321 322 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n", 323 get_bits_left(&s->gb), 324 show_bits(&s->gb, 24), s->padding_bug_score); 325 326 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask); 327 328 return -1; 329} 330 331int ff_h263_decode_frame(AVCodecContext *avctx, 332 void *data, int *data_size, 333 AVPacket *avpkt) 334{ 335 const uint8_t *buf = avpkt->data; 336 int buf_size = avpkt->size; 337 MpegEncContext *s = avctx->priv_data; 338 int ret; 339 AVFrame *pict = data; 340 341#ifdef PRINT_FRAME_TIME 342uint64_t time= rdtsc(); 343#endif 344 s->flags= avctx->flags; 345 s->flags2= avctx->flags2; 346 347 /* no supplementary picture */ 348 if (buf_size == 0) { 349 /* special case for last picture */ 350 if (s->low_delay==0 && s->next_picture_ptr) { 351 *pict= *(AVFrame*)s->next_picture_ptr; 352 s->next_picture_ptr= NULL; 353 354 *data_size = sizeof(AVFrame); 355 } 356 357 return 0; 358 } 359 360 if(s->flags&CODEC_FLAG_TRUNCATED){ 361 int next; 362 363 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){ 364 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size); 365 }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){ 366 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size); 367 }else{ 368 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n"); 369 return -1; 370 } 371 372 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 ) 373 return buf_size; 374 } 375 376 377retry: 378 379 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder 380 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8); 381 }else 382 init_get_bits(&s->gb, buf, buf_size*8); 383 s->bitstream_buffer_size=0; 384 385 if (!s->context_initialized) { 386 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix 387 return -1; 388 } 389 390 /* We need to set current_picture_ptr before reading the header, 391 * otherwise we cannot store anyting in there */ 392 if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){ 393 int i= ff_find_unused_picture(s, 0); 394 s->current_picture_ptr= &s->picture[i]; 395 } 396 397 /* let's go :-) */ 398 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) { 399 ret= ff_wmv2_decode_picture_header(s); 400 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) { 401 ret = msmpeg4_decode_picture_header(s); 402 } else if (CONFIG_MPEG4_DECODER && s->h263_pred) { 403 if(s->avctx->extradata_size && s->picture_number==0){ 404 GetBitContext gb; 405 406 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8); 407 ret = ff_mpeg4_decode_picture_header(s, &gb); 408 } 409 ret = ff_mpeg4_decode_picture_header(s, &s->gb); 410 } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) { 411 ret = ff_intel_h263_decode_picture_header(s); 412 } else if (CONFIG_FLV_DECODER && s->h263_flv) { 413 ret = ff_flv_decode_picture_header(s); 414 } else { 415 ret = h263_decode_picture_header(s); 416 } 417 418 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size); 419 420 /* skip if the header was thrashed */ 421 if (ret < 0){ 422 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n"); 423 return -1; 424 } 425 426 avctx->has_b_frames= !s->low_delay; 427 428 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){ 429 if(s->stream_codec_tag == AV_RL32("XVID") || 430 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") || 431 s->codec_tag == AV_RL32("RMP4") || 432 s->codec_tag == AV_RL32("SIPP") 433 ) 434 s->xvid_build= 0; 435#if 0 436 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1 437 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc 438 s->xvid_build= 0; 439#endif 440 } 441 442 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){ 443 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0) 444 s->divx_version= 400; //divx 4 445 } 446 447 if(s->xvid_build>=0 && s->divx_version>=0){ 448 s->divx_version= 449 s->divx_build= -1; 450 } 451 452 if(s->workaround_bugs&FF_BUG_AUTODETECT){ 453 if(s->codec_tag == AV_RL32("XVIX")) 454 s->workaround_bugs|= FF_BUG_XVID_ILACE; 455 456 if(s->codec_tag == AV_RL32("UMP4")){ 457 s->workaround_bugs|= FF_BUG_UMP4; 458 } 459 460 if(s->divx_version>=500 && s->divx_build<1814){ 461 s->workaround_bugs|= FF_BUG_QPEL_CHROMA; 462 } 463 464 if(s->divx_version>502 && s->divx_build<1814){ 465 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2; 466 } 467 468 if(s->xvid_build<=3U) 469 s->padding_bug_score= 256*256*256*64; 470 471 if(s->xvid_build<=1U) 472 s->workaround_bugs|= FF_BUG_QPEL_CHROMA; 473 474 if(s->xvid_build<=12U) 475 s->workaround_bugs|= FF_BUG_EDGE; 476 477 if(s->xvid_build<=32U) 478 s->workaround_bugs|= FF_BUG_DC_CLIP; 479 480#define SET_QPEL_FUNC(postfix1, postfix2) \ 481 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\ 482 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\ 483 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2; 484 485 if(s->lavc_build<4653U) 486 s->workaround_bugs|= FF_BUG_STD_QPEL; 487 488 if(s->lavc_build<4655U) 489 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE; 490 491 if(s->lavc_build<4670U){ 492 s->workaround_bugs|= FF_BUG_EDGE; 493 } 494 495 if(s->lavc_build<=4712U) 496 s->workaround_bugs|= FF_BUG_DC_CLIP; 497 498 if(s->divx_version>=0) 499 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE; 500//printf("padding_bug_score: %d\n", s->padding_bug_score); 501 if(s->divx_version==501 && s->divx_build==20020416) 502 s->padding_bug_score= 256*256*256*64; 503 504 if(s->divx_version<500U){ 505 s->workaround_bugs|= FF_BUG_EDGE; 506 } 507 508 if(s->divx_version>=0) 509 s->workaround_bugs|= FF_BUG_HPEL_CHROMA; 510#if 0 511 if(s->divx_version==500) 512 s->padding_bug_score= 256*256*256*64; 513 514 /* very ugly XVID padding bug detection FIXME/XXX solve this differently 515 * Let us hope this at least works. 516 */ 517 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1 518 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0) 519 s->workaround_bugs|= FF_BUG_NO_PADDING; 520 521 if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok 522 s->workaround_bugs|= FF_BUG_NO_PADDING; 523#endif 524 } 525 526 if(s->workaround_bugs& FF_BUG_STD_QPEL){ 527 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c) 528 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c) 529 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c) 530 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c) 531 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c) 532 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c) 533 534 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c) 535 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c) 536 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c) 537 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c) 538 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c) 539 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c) 540 } 541 542 if(avctx->debug & FF_DEBUG_BUGS) 543 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n", 544 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build, 545 s->divx_packed ? "p" : ""); 546 547#if 0 // dump bits per frame / qp / complexity 548{ 549 static FILE *f=NULL; 550 if(!f) f=fopen("rate_qp_cplx.txt", "w"); 551 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale); 552} 553#endif 554 555#if HAVE_MMX 556 if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & FF_MM_MMX)){ 557 avctx->idct_algo= FF_IDCT_XVIDMMX; 558 avctx->coded_width= 0; // force reinit 559// dsputil_init(&s->dsp, avctx); 560 s->picture_number=0; 561 } 562#endif 563 564 /* After H263 & mpeg4 header decode we have the height, width,*/ 565 /* and other parameters. So then we could init the picture */ 566 /* FIXME: By the way H263 decoder is evolving it should have */ 567 /* an H263EncContext */ 568 569 if ( s->width != avctx->coded_width 570 || s->height != avctx->coded_height) { 571 /* H.263 could change picture size any time */ 572 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat 573 s->parse_context.buffer=0; 574 MPV_common_end(s); 575 s->parse_context= pc; 576 } 577 if (!s->context_initialized) { 578 avcodec_set_dimensions(avctx, s->width, s->height); 579 580 goto retry; 581 } 582 583 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I)) 584 s->gob_index = ff_h263_get_gob_height(s); 585 586 // for hurry_up==5 587 s->current_picture.pict_type= s->pict_type; 588 s->current_picture.key_frame= s->pict_type == FF_I_TYPE; 589 590 /* skip B-frames if we don't have reference frames */ 591 if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size); 592 /* skip b frames if we are in a hurry */ 593 if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size); 594 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE) 595 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE) 596 || avctx->skip_frame >= AVDISCARD_ALL) 597 return get_consumed_bytes(s, buf_size); 598 /* skip everything if we are in a hurry>=5 */ 599 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size); 600 601 if(s->next_p_frame_damaged){ 602 if(s->pict_type==FF_B_TYPE) 603 return get_consumed_bytes(s, buf_size); 604 else 605 s->next_p_frame_damaged=0; 606 } 607 608 if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){ 609 s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab; 610 s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab; 611 }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){ 612 s->me.qpel_put= s->dsp.put_qpel_pixels_tab; 613 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab; 614 }else{ 615 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab; 616 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab; 617 } 618 619 if(MPV_frame_start(s, avctx) < 0) 620 return -1; 621 622 if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) { 623 ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer); 624 goto frame_end; 625 } 626 627 if (avctx->hwaccel) { 628 if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0) 629 return -1; 630 } 631 632 ff_er_frame_start(s); 633 634 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type 635 //which is not available before MPV_frame_start() 636 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){ 637 ret = ff_wmv2_decode_secondary_picture_header(s); 638 if(ret<0) return ret; 639 if(ret==1) goto intrax8_decoded; 640 } 641 642 /* decode each macroblock */ 643 s->mb_x=0; 644 s->mb_y=0; 645 646 decode_slice(s); 647 while(s->mb_y<s->mb_height){ 648 if(s->msmpeg4_version){ 649 if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits) 650 break; 651 }else{ 652 if(ff_h263_resync(s)<0) 653 break; 654 } 655 656 if(s->msmpeg4_version<4 && s->h263_pred) 657 ff_mpeg4_clean_buffers(s); 658 659 decode_slice(s); 660 } 661 662 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE) 663 if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){ 664 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR; 665 } 666 667 assert(s->bitstream_buffer_size==0); 668frame_end: 669 /* divx 5.01+ bistream reorder stuff */ 670 if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){ 671 int current_pos= get_bits_count(&s->gb)>>3; 672 int startcode_found=0; 673 674 if(buf_size - current_pos > 5){ 675 int i; 676 for(i=current_pos; i<buf_size-3; i++){ 677 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){ 678 startcode_found=1; 679 break; 680 } 681 } 682 } 683 if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build>=0){ //xvid style 684 startcode_found=1; 685 current_pos=0; 686 } 687 688 if(startcode_found){ 689 av_fast_malloc( 690 &s->bitstream_buffer, 691 &s->allocated_bitstream_buffer_size, 692 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE); 693 if (!s->bitstream_buffer) 694 return AVERROR(ENOMEM); 695 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos); 696 s->bitstream_buffer_size= buf_size - current_pos; 697 } 698 } 699 700intrax8_decoded: 701 ff_er_frame_end(s); 702 703 if (avctx->hwaccel) { 704 if (avctx->hwaccel->end_frame(avctx) < 0) 705 return -1; 706 } 707 708 MPV_frame_end(s); 709 710assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type); 711assert(s->current_picture.pict_type == s->pict_type); 712 if (s->pict_type == FF_B_TYPE || s->low_delay) { 713 *pict= *(AVFrame*)s->current_picture_ptr; 714 } else if (s->last_picture_ptr != NULL) { 715 *pict= *(AVFrame*)s->last_picture_ptr; 716 } 717 718 if(s->last_picture_ptr || s->low_delay){ 719 *data_size = sizeof(AVFrame); 720 ff_print_debug_info(s, pict); 721 } 722 723#ifdef PRINT_FRAME_TIME 724av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time); 725#endif 726 727 return get_consumed_bytes(s, buf_size); 728} 729 730AVCodec h263_decoder = { 731 "h263", 732 AVMEDIA_TYPE_VIDEO, 733 CODEC_ID_H263, 734 sizeof(MpegEncContext), 735 ff_h263_decode_init, 736 NULL, 737 ff_h263_decode_end, 738 ff_h263_decode_frame, 739 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, 740 .flush= ff_mpeg_flush, 741 .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"), 742 .pix_fmts= ff_hwaccel_pixfmt_list_420, 743}; 744