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 Libav. 7 * 8 * Libav is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * Libav is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with Libav; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23/** 24 * @file 25 * H.263 decoder. 26 */ 27 28#include "libavutil/cpu.h" 29#include "internal.h" 30#include "avcodec.h" 31#include "dsputil.h" 32#include "mpegvideo.h" 33#include "h263.h" 34#include "h263_parser.h" 35#include "mpeg4video_parser.h" 36#include "msmpeg4.h" 37#include "vdpau_internal.h" 38#include "thread.h" 39#include "flv.h" 40#include "mpeg4video.h" 41 42//#define DEBUG 43//#define PRINT_FRAME_TIME 44 45av_cold int ff_h263_decode_init(AVCodecContext *avctx) 46{ 47 MpegEncContext *s = avctx->priv_data; 48 49 s->avctx = avctx; 50 s->out_format = FMT_H263; 51 52 s->width = avctx->coded_width; 53 s->height = avctx->coded_height; 54 s->workaround_bugs= avctx->workaround_bugs; 55 56 // set defaults 57 MPV_decode_defaults(s); 58 s->quant_precision=5; 59 s->decode_mb= ff_h263_decode_mb; 60 s->low_delay= 1; 61 avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts); 62 s->unrestricted_mv= 1; 63 64 /* select sub codec */ 65 switch(avctx->codec->id) { 66 case CODEC_ID_H263: 67 s->unrestricted_mv= 0; 68 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER; 69 break; 70 case CODEC_ID_MPEG4: 71 break; 72 case CODEC_ID_MSMPEG4V1: 73 s->h263_pred = 1; 74 s->msmpeg4_version=1; 75 break; 76 case CODEC_ID_MSMPEG4V2: 77 s->h263_pred = 1; 78 s->msmpeg4_version=2; 79 break; 80 case CODEC_ID_MSMPEG4V3: 81 s->h263_pred = 1; 82 s->msmpeg4_version=3; 83 break; 84 case CODEC_ID_WMV1: 85 s->h263_pred = 1; 86 s->msmpeg4_version=4; 87 break; 88 case CODEC_ID_WMV2: 89 s->h263_pred = 1; 90 s->msmpeg4_version=5; 91 break; 92 case CODEC_ID_VC1: 93 case CODEC_ID_WMV3: 94 case CODEC_ID_VC1IMAGE: 95 case CODEC_ID_WMV3IMAGE: 96 s->h263_pred = 1; 97 s->msmpeg4_version=6; 98 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; 99 break; 100 case CODEC_ID_H263I: 101 break; 102 case CODEC_ID_FLV1: 103 s->h263_flv = 1; 104 break; 105 default: 106 return -1; 107 } 108 s->codec_id= avctx->codec->id; 109 avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt); 110 111 /* for h263, we allocate the images after having read the header */ 112 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4) 113 if (MPV_common_init(s) < 0) 114 return -1; 115 116 ff_h263_decode_init_vlc(s); 117 118 return 0; 119} 120 121av_cold int ff_h263_decode_end(AVCodecContext *avctx) 122{ 123 MpegEncContext *s = avctx->priv_data; 124 125 MPV_common_end(s); 126 return 0; 127} 128 129/** 130 * Return the number of bytes consumed for building the current frame. 131 */ 132static int get_consumed_bytes(MpegEncContext *s, int buf_size){ 133 int pos= (get_bits_count(&s->gb)+7)>>3; 134 135 if(s->divx_packed || s->avctx->hwaccel){ 136 //we would have to scan through the whole buf to handle the weird reordering ... 137 return buf_size; 138 }else if(s->flags&CODEC_FLAG_TRUNCATED){ 139 pos -= s->parse_context.last_index; 140 if(pos<0) pos=0; // padding is not really read so this might be -1 141 return pos; 142 }else{ 143 if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...) 144 if(pos+10>buf_size) pos=buf_size; // oops ;) 145 146 return pos; 147 } 148} 149 150static int decode_slice(MpegEncContext *s){ 151 const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F; 152 const int mb_size= 16>>s->avctx->lowres; 153 s->last_resync_gb= s->gb; 154 s->first_slice_line= 1; 155 156 s->resync_mb_x= s->mb_x; 157 s->resync_mb_y= s->mb_y; 158 159 ff_set_qscale(s, s->qscale); 160 161 if (s->avctx->hwaccel) { 162 const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8; 163 const uint8_t *end = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end); 164 skip_bits_long(&s->gb, 8*(end - start)); 165 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start); 166 } 167 168 if(s->partitioned_frame){ 169 const int qscale= s->qscale; 170 171 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){ 172 if(ff_mpeg4_decode_partitions(s) < 0) 173 return -1; 174 } 175 176 /* restore variables which were modified */ 177 s->first_slice_line=1; 178 s->mb_x= s->resync_mb_x; 179 s->mb_y= s->resync_mb_y; 180 ff_set_qscale(s, qscale); 181 } 182 183 for(; s->mb_y < s->mb_height; s->mb_y++) { 184 /* per-row end of slice checks */ 185 if(s->msmpeg4_version){ 186 if(s->resync_mb_y + s->slice_height == s->mb_y){ 187 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END); 188 189 return 0; 190 } 191 } 192 193 if(s->msmpeg4_version==1){ 194 s->last_dc[0]= 195 s->last_dc[1]= 196 s->last_dc[2]= 128; 197 } 198 199 ff_init_block_index(s); 200 for(; s->mb_x < s->mb_width; s->mb_x++) { 201 int ret; 202 203 ff_update_block_index(s); 204 205 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){ 206 s->first_slice_line=0; 207 } 208 209 /* DCT & quantize */ 210 211 s->mv_dir = MV_DIR_FORWARD; 212 s->mv_type = MV_TYPE_16X16; 213// s->mb_skipped = 0; 214//printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24)); 215 ret= s->decode_mb(s, s->block); 216 217 if (s->pict_type!=AV_PICTURE_TYPE_B) 218 ff_h263_update_motion_val(s); 219 220 if(ret<0){ 221 const int xy= s->mb_x + s->mb_y*s->mb_stride; 222 if(ret==SLICE_END){ 223 MPV_decode_mb(s, s->block); 224 if(s->loop_filter) 225 ff_h263_loop_filter(s); 226 227//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)); 228 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask); 229 230 s->padding_bug_score--; 231 232 if(++s->mb_x >= s->mb_width){ 233 s->mb_x=0; 234 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size); 235 MPV_report_decode_progress(s); 236 s->mb_y++; 237 } 238 return 0; 239 }else if(ret==SLICE_NOEND){ 240 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy); 241 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, ER_MB_END&part_mask); 242 return -1; 243 } 244 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy); 245 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask); 246 247 return -1; 248 } 249 250 MPV_decode_mb(s, s->block); 251 if(s->loop_filter) 252 ff_h263_loop_filter(s); 253 } 254 255 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size); 256 MPV_report_decode_progress(s); 257 258 s->mb_x= 0; 259 } 260 261 assert(s->mb_x==0 && s->mb_y==s->mb_height); 262 263 if(s->codec_id==CODEC_ID_MPEG4 264 && (s->workaround_bugs&FF_BUG_AUTODETECT) 265 && get_bits_left(&s->gb) >= 48 266 && show_bits(&s->gb, 24)==0x4010 267 && !s->data_partitioning) 268 s->padding_bug_score+=32; 269 270 /* try to detect the padding bug */ 271 if( s->codec_id==CODEC_ID_MPEG4 272 && (s->workaround_bugs&FF_BUG_AUTODETECT) 273 && get_bits_left(&s->gb) >=0 274 && get_bits_left(&s->gb) < 48 275// && !s->resync_marker 276 && !s->data_partitioning){ 277 278 const int bits_count= get_bits_count(&s->gb); 279 const int bits_left = s->gb.size_in_bits - bits_count; 280 281 if(bits_left==0){ 282 s->padding_bug_score+=16; 283 } else if(bits_left != 1){ 284 int v= show_bits(&s->gb, 8); 285 v|= 0x7F >> (7-(bits_count&7)); 286 287 if(v==0x7F && bits_left<=8) 288 s->padding_bug_score--; 289 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16) 290 s->padding_bug_score+= 4; 291 else 292 s->padding_bug_score++; 293 } 294 } 295 296 if(s->workaround_bugs&FF_BUG_AUTODETECT){ 297 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/) 298 s->workaround_bugs |= FF_BUG_NO_PADDING; 299 else 300 s->workaround_bugs &= ~FF_BUG_NO_PADDING; 301 } 302 303 // handle formats which don't have unique end markers 304 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly 305 int left= get_bits_left(&s->gb); 306 int max_extra=7; 307 308 /* no markers in M$ crap */ 309 if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I) 310 max_extra+= 17; 311 312 /* buggy padding but the frame should still end approximately at the bitstream end */ 313 if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&AV_EF_BUFFER)) 314 max_extra+= 48; 315 else if((s->workaround_bugs&FF_BUG_NO_PADDING)) 316 max_extra+= 256*256*256*64; 317 318 if(left>max_extra){ 319 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24)); 320 } 321 else if(left<0){ 322 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left); 323 }else 324 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END); 325 326 return 0; 327 } 328 329 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n", 330 get_bits_left(&s->gb), 331 show_bits(&s->gb, 24), s->padding_bug_score); 332 333 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask); 334 335 return -1; 336} 337 338int ff_h263_decode_frame(AVCodecContext *avctx, 339 void *data, int *data_size, 340 AVPacket *avpkt) 341{ 342 const uint8_t *buf = avpkt->data; 343 int buf_size = avpkt->size; 344 MpegEncContext *s = avctx->priv_data; 345 int ret; 346 AVFrame *pict = data; 347 348#ifdef PRINT_FRAME_TIME 349uint64_t time= rdtsc(); 350#endif 351 s->flags= avctx->flags; 352 s->flags2= avctx->flags2; 353 354 /* no supplementary picture */ 355 if (buf_size == 0) { 356 /* special case for last picture */ 357 if (s->low_delay==0 && s->next_picture_ptr) { 358 *pict= *(AVFrame*)s->next_picture_ptr; 359 s->next_picture_ptr= NULL; 360 361 *data_size = sizeof(AVFrame); 362 } 363 364 return 0; 365 } 366 367 if(s->flags&CODEC_FLAG_TRUNCATED){ 368 int next; 369 370 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){ 371 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size); 372 }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){ 373 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size); 374 }else{ 375 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n"); 376 return -1; 377 } 378 379 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 ) 380 return buf_size; 381 } 382 383 384retry: 385 386 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder 387 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8); 388 }else 389 init_get_bits(&s->gb, buf, buf_size*8); 390 s->bitstream_buffer_size=0; 391 392 if (!s->context_initialized) { 393 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix 394 return -1; 395 } 396 397 /* We need to set current_picture_ptr before reading the header, 398 * otherwise we cannot store anyting in there */ 399 if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) { 400 int i= ff_find_unused_picture(s, 0); 401 if (i < 0) 402 return i; 403 s->current_picture_ptr= &s->picture[i]; 404 } 405 406 /* let's go :-) */ 407 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) { 408 ret= ff_wmv2_decode_picture_header(s); 409 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) { 410 ret = msmpeg4_decode_picture_header(s); 411 } else if (CONFIG_MPEG4_DECODER && s->h263_pred) { 412 if(s->avctx->extradata_size && s->picture_number==0){ 413 GetBitContext gb; 414 415 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8); 416 ret = ff_mpeg4_decode_picture_header(s, &gb); 417 } 418 ret = ff_mpeg4_decode_picture_header(s, &s->gb); 419 } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) { 420 ret = ff_intel_h263_decode_picture_header(s); 421 } else if (CONFIG_FLV_DECODER && s->h263_flv) { 422 ret = ff_flv_decode_picture_header(s); 423 } else { 424 ret = ff_h263_decode_picture_header(s); 425 } 426 427 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size); 428 429 /* skip if the header was thrashed */ 430 if (ret < 0){ 431 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n"); 432 return -1; 433 } else if ((s->width != avctx->coded_width || 434 s->height != avctx->coded_height || 435 (s->width + 15) >> 4 != s->mb_width || 436 (s->height + 15) >> 4 != s->mb_height) && 437 (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))) { 438 av_log_missing_feature(s->avctx, "Width/height/bit depth/chroma idc changing with threads is", 0); 439 return AVERROR_PATCHWELCOME; // width / height changed during parallelized decoding 440 } 441 442 avctx->has_b_frames= !s->low_delay; 443 444 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){ 445 if(s->stream_codec_tag == AV_RL32("XVID") || 446 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") || 447 s->codec_tag == AV_RL32("RMP4") || 448 s->codec_tag == AV_RL32("SIPP") 449 ) 450 s->xvid_build= 0; 451#if 0 452 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1 453 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc 454 s->xvid_build= 0; 455#endif 456 } 457 458 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){ 459 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0) 460 s->divx_version= 400; //divx 4 461 } 462 463 if(s->xvid_build>=0 && s->divx_version>=0){ 464 s->divx_version= 465 s->divx_build= -1; 466 } 467 468 if(s->workaround_bugs&FF_BUG_AUTODETECT){ 469 if(s->codec_tag == AV_RL32("XVIX")) 470 s->workaround_bugs|= FF_BUG_XVID_ILACE; 471 472 if(s->codec_tag == AV_RL32("UMP4")){ 473 s->workaround_bugs|= FF_BUG_UMP4; 474 } 475 476 if(s->divx_version>=500 && s->divx_build<1814){ 477 s->workaround_bugs|= FF_BUG_QPEL_CHROMA; 478 } 479 480 if(s->divx_version>502 && s->divx_build<1814){ 481 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2; 482 } 483 484 if(s->xvid_build<=3U) 485 s->padding_bug_score= 256*256*256*64; 486 487 if(s->xvid_build<=1U) 488 s->workaround_bugs|= FF_BUG_QPEL_CHROMA; 489 490 if(s->xvid_build<=12U) 491 s->workaround_bugs|= FF_BUG_EDGE; 492 493 if(s->xvid_build<=32U) 494 s->workaround_bugs|= FF_BUG_DC_CLIP; 495 496#define SET_QPEL_FUNC(postfix1, postfix2) \ 497 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\ 498 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\ 499 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2; 500 501 if(s->lavc_build<4653U) 502 s->workaround_bugs|= FF_BUG_STD_QPEL; 503 504 if(s->lavc_build<4655U) 505 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE; 506 507 if(s->lavc_build<4670U){ 508 s->workaround_bugs|= FF_BUG_EDGE; 509 } 510 511 if(s->lavc_build<=4712U) 512 s->workaround_bugs|= FF_BUG_DC_CLIP; 513 514 if(s->divx_version>=0) 515 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE; 516//printf("padding_bug_score: %d\n", s->padding_bug_score); 517 if(s->divx_version==501 && s->divx_build==20020416) 518 s->padding_bug_score= 256*256*256*64; 519 520 if(s->divx_version<500U){ 521 s->workaround_bugs|= FF_BUG_EDGE; 522 } 523 524 if(s->divx_version>=0) 525 s->workaround_bugs|= FF_BUG_HPEL_CHROMA; 526#if 0 527 if(s->divx_version==500) 528 s->padding_bug_score= 256*256*256*64; 529 530 /* very ugly XVID padding bug detection FIXME/XXX solve this differently 531 * Let us hope this at least works. 532 */ 533 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1 534 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0) 535 s->workaround_bugs|= FF_BUG_NO_PADDING; 536 537 if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok 538 s->workaround_bugs|= FF_BUG_NO_PADDING; 539#endif 540 } 541 542 if(s->workaround_bugs& FF_BUG_STD_QPEL){ 543 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c) 544 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c) 545 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c) 546 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c) 547 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c) 548 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c) 549 550 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c) 551 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c) 552 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c) 553 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c) 554 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c) 555 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c) 556 } 557 558 if(avctx->debug & FF_DEBUG_BUGS) 559 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n", 560 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build, 561 s->divx_packed ? "p" : ""); 562 563#if HAVE_MMX 564 if (s->codec_id == CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) { 565 avctx->idct_algo= FF_IDCT_XVIDMMX; 566 ff_dct_common_init(s); 567 s->picture_number=0; 568 } 569#endif 570 571 /* After H263 & mpeg4 header decode we have the height, width,*/ 572 /* and other parameters. So then we could init the picture */ 573 /* FIXME: By the way H263 decoder is evolving it should have */ 574 /* an H263EncContext */ 575 576 if ( s->width != avctx->coded_width 577 || s->height != avctx->coded_height) { 578 /* H.263 could change picture size any time */ 579 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat 580 581 if (HAVE_THREADS && (s->avctx->active_thread_type&FF_THREAD_FRAME)) { 582 av_log_missing_feature(s->avctx, "Width/height/bit depth/chroma idc changing with threads is", 0); 583 return -1; // width / height changed during parallelized decoding 584 } 585 586 s->parse_context.buffer=0; 587 MPV_common_end(s); 588 s->parse_context= pc; 589 } 590 if (!s->context_initialized) { 591 avcodec_set_dimensions(avctx, s->width, s->height); 592 593 goto retry; 594 } 595 596 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I)) 597 s->gob_index = ff_h263_get_gob_height(s); 598 599 // for skipping the frame 600 s->current_picture.f.pict_type = s->pict_type; 601 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I; 602 603 /* skip B-frames if we don't have reference frames */ 604 if(s->last_picture_ptr==NULL && (s->pict_type==AV_PICTURE_TYPE_B || s->dropable)) return get_consumed_bytes(s, buf_size); 605 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B) 606 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I) 607 || avctx->skip_frame >= AVDISCARD_ALL) 608 return get_consumed_bytes(s, buf_size); 609 610 if(s->next_p_frame_damaged){ 611 if(s->pict_type==AV_PICTURE_TYPE_B) 612 return get_consumed_bytes(s, buf_size); 613 else 614 s->next_p_frame_damaged=0; 615 } 616 617 if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==AV_PICTURE_TYPE_B){ 618 s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab; 619 s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab; 620 }else if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){ 621 s->me.qpel_put= s->dsp.put_qpel_pixels_tab; 622 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab; 623 }else{ 624 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab; 625 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab; 626 } 627 628 if(MPV_frame_start(s, avctx) < 0) 629 return -1; 630 631 if (!s->divx_packed) ff_thread_finish_setup(avctx); 632 633 if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) { 634 ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer); 635 goto frame_end; 636 } 637 638 if (avctx->hwaccel) { 639 if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0) 640 return -1; 641 } 642 643 ff_er_frame_start(s); 644 645 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type 646 //which is not available before MPV_frame_start() 647 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){ 648 ret = ff_wmv2_decode_secondary_picture_header(s); 649 if(ret<0) return ret; 650 if(ret==1) goto intrax8_decoded; 651 } 652 653 /* decode each macroblock */ 654 s->mb_x=0; 655 s->mb_y=0; 656 657 ret = decode_slice(s); 658 while(s->mb_y<s->mb_height){ 659 if(s->msmpeg4_version){ 660 if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0) 661 break; 662 }else{ 663 int prev_x=s->mb_x, prev_y=s->mb_y; 664 if(ff_h263_resync(s)<0) 665 break; 666 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x) 667 s->error_occurred = 1; 668 } 669 670 if(s->msmpeg4_version<4 && s->h263_pred) 671 ff_mpeg4_clean_buffers(s); 672 673 if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA; 674 } 675 676 if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I) 677 if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){ 678 s->error_status_table[s->mb_num-1]= ER_MB_ERROR; 679 } 680 681 assert(s->bitstream_buffer_size==0); 682frame_end: 683 /* divx 5.01+ bistream reorder stuff */ 684 if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){ 685 int current_pos= get_bits_count(&s->gb)>>3; 686 int startcode_found=0; 687 688 if(buf_size - current_pos > 5){ 689 int i; 690 for(i=current_pos; i<buf_size-3; i++){ 691 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){ 692 startcode_found=1; 693 break; 694 } 695 } 696 } 697 if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build>=0){ //xvid style 698 startcode_found=1; 699 current_pos=0; 700 } 701 702 if(startcode_found){ 703 av_fast_malloc( 704 &s->bitstream_buffer, 705 &s->allocated_bitstream_buffer_size, 706 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE); 707 if (!s->bitstream_buffer) 708 return AVERROR(ENOMEM); 709 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos); 710 s->bitstream_buffer_size= buf_size - current_pos; 711 } 712 } 713 714intrax8_decoded: 715 ff_er_frame_end(s); 716 717 if (avctx->hwaccel) { 718 if (avctx->hwaccel->end_frame(avctx) < 0) 719 return -1; 720 } 721 722 MPV_frame_end(s); 723 724 assert(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type); 725 assert(s->current_picture.f.pict_type == s->pict_type); 726 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) { 727 *pict= *(AVFrame*)s->current_picture_ptr; 728 } else if (s->last_picture_ptr != NULL) { 729 *pict= *(AVFrame*)s->last_picture_ptr; 730 } 731 732 if(s->last_picture_ptr || s->low_delay){ 733 *data_size = sizeof(AVFrame); 734 ff_print_debug_info(s, pict); 735 } 736 737#ifdef PRINT_FRAME_TIME 738av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time); 739#endif 740 741 return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size); 742} 743 744AVCodec ff_h263_decoder = { 745 .name = "h263", 746 .type = AVMEDIA_TYPE_VIDEO, 747 .id = CODEC_ID_H263, 748 .priv_data_size = sizeof(MpegEncContext), 749 .init = ff_h263_decode_init, 750 .close = ff_h263_decode_end, 751 .decode = ff_h263_decode_frame, 752 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, 753 .flush= ff_mpeg_flush, 754 .max_lowres= 3, 755 .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"), 756 .pix_fmts= ff_hwaccel_pixfmt_list_420, 757}; 758