Libav 0.7.1
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00001 /* 00002 * H.26L/H.264/AVC/JVT/14496-10/... reference picture handling 00003 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00028 #include "internal.h" 00029 #include "dsputil.h" 00030 #include "avcodec.h" 00031 #include "h264.h" 00032 #include "golomb.h" 00033 00034 //#undef NDEBUG 00035 #include <assert.h> 00036 00037 00038 static void pic_as_field(Picture *pic, const int parity){ 00039 int i; 00040 for (i = 0; i < 4; ++i) { 00041 if (parity == PICT_BOTTOM_FIELD) 00042 pic->data[i] += pic->linesize[i]; 00043 pic->reference = parity; 00044 pic->linesize[i] *= 2; 00045 } 00046 pic->poc= pic->field_poc[parity == PICT_BOTTOM_FIELD]; 00047 } 00048 00049 static int split_field_copy(Picture *dest, Picture *src, 00050 int parity, int id_add){ 00051 int match = !!(src->reference & parity); 00052 00053 if (match) { 00054 *dest = *src; 00055 if(parity != PICT_FRAME){ 00056 pic_as_field(dest, parity); 00057 dest->pic_id *= 2; 00058 dest->pic_id += id_add; 00059 } 00060 } 00061 00062 return match; 00063 } 00064 00065 static int build_def_list(Picture *def, Picture **in, int len, int is_long, int sel){ 00066 int i[2]={0}; 00067 int index=0; 00068 00069 while(i[0]<len || i[1]<len){ 00070 while(i[0]<len && !(in[ i[0] ] && (in[ i[0] ]->reference & sel))) 00071 i[0]++; 00072 while(i[1]<len && !(in[ i[1] ] && (in[ i[1] ]->reference & (sel^3)))) 00073 i[1]++; 00074 if(i[0] < len){ 00075 in[ i[0] ]->pic_id= is_long ? i[0] : in[ i[0] ]->frame_num; 00076 split_field_copy(&def[index++], in[ i[0]++ ], sel , 1); 00077 } 00078 if(i[1] < len){ 00079 in[ i[1] ]->pic_id= is_long ? i[1] : in[ i[1] ]->frame_num; 00080 split_field_copy(&def[index++], in[ i[1]++ ], sel^3, 0); 00081 } 00082 } 00083 00084 return index; 00085 } 00086 00087 static int add_sorted(Picture **sorted, Picture **src, int len, int limit, int dir){ 00088 int i, best_poc; 00089 int out_i= 0; 00090 00091 for(;;){ 00092 best_poc= dir ? INT_MIN : INT_MAX; 00093 00094 for(i=0; i<len; i++){ 00095 const int poc= src[i]->poc; 00096 if(((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)){ 00097 best_poc= poc; 00098 sorted[out_i]= src[i]; 00099 } 00100 } 00101 if(best_poc == (dir ? INT_MIN : INT_MAX)) 00102 break; 00103 limit= sorted[out_i++]->poc - dir; 00104 } 00105 return out_i; 00106 } 00107 00108 int ff_h264_fill_default_ref_list(H264Context *h){ 00109 MpegEncContext * const s = &h->s; 00110 int i, len; 00111 00112 if(h->slice_type_nos==AV_PICTURE_TYPE_B){ 00113 Picture *sorted[32]; 00114 int cur_poc, list; 00115 int lens[2]; 00116 00117 if(FIELD_PICTURE) 00118 cur_poc= s->current_picture_ptr->field_poc[ s->picture_structure == PICT_BOTTOM_FIELD ]; 00119 else 00120 cur_poc= s->current_picture_ptr->poc; 00121 00122 for(list= 0; list<2; list++){ 00123 len= add_sorted(sorted , h->short_ref, h->short_ref_count, cur_poc, 1^list); 00124 len+=add_sorted(sorted+len, h->short_ref, h->short_ref_count, cur_poc, 0^list); 00125 assert(len<=32); 00126 len= build_def_list(h->default_ref_list[list] , sorted , len, 0, s->picture_structure); 00127 len+=build_def_list(h->default_ref_list[list]+len, h->long_ref, 16 , 1, s->picture_structure); 00128 assert(len<=32); 00129 00130 if(len < h->ref_count[list]) 00131 memset(&h->default_ref_list[list][len], 0, sizeof(Picture)*(h->ref_count[list] - len)); 00132 lens[list]= len; 00133 } 00134 00135 if(lens[0] == lens[1] && lens[1] > 1){ 00136 for(i=0; h->default_ref_list[0][i].data[0] == h->default_ref_list[1][i].data[0] && i<lens[0]; i++); 00137 if(i == lens[0]) 00138 FFSWAP(Picture, h->default_ref_list[1][0], h->default_ref_list[1][1]); 00139 } 00140 }else{ 00141 len = build_def_list(h->default_ref_list[0] , h->short_ref, h->short_ref_count, 0, s->picture_structure); 00142 len+= build_def_list(h->default_ref_list[0]+len, h-> long_ref, 16 , 1, s->picture_structure); 00143 assert(len <= 32); 00144 if(len < h->ref_count[0]) 00145 memset(&h->default_ref_list[0][len], 0, sizeof(Picture)*(h->ref_count[0] - len)); 00146 } 00147 #ifdef TRACE 00148 for (i=0; i<h->ref_count[0]; i++) { 00149 tprintf(h->s.avctx, "List0: %s fn:%d 0x%p\n", (h->default_ref_list[0][i].long_ref ? "LT" : "ST"), h->default_ref_list[0][i].pic_id, h->default_ref_list[0][i].data[0]); 00150 } 00151 if(h->slice_type_nos==AV_PICTURE_TYPE_B){ 00152 for (i=0; i<h->ref_count[1]; i++) { 00153 tprintf(h->s.avctx, "List1: %s fn:%d 0x%p\n", (h->default_ref_list[1][i].long_ref ? "LT" : "ST"), h->default_ref_list[1][i].pic_id, h->default_ref_list[1][i].data[0]); 00154 } 00155 } 00156 #endif 00157 return 0; 00158 } 00159 00160 static void print_short_term(H264Context *h); 00161 static void print_long_term(H264Context *h); 00162 00173 static int pic_num_extract(H264Context *h, int pic_num, int *structure){ 00174 MpegEncContext * const s = &h->s; 00175 00176 *structure = s->picture_structure; 00177 if(FIELD_PICTURE){ 00178 if (!(pic_num & 1)) 00179 /* opposite field */ 00180 *structure ^= PICT_FRAME; 00181 pic_num >>= 1; 00182 } 00183 00184 return pic_num; 00185 } 00186 00187 int ff_h264_decode_ref_pic_list_reordering(H264Context *h){ 00188 MpegEncContext * const s = &h->s; 00189 int list, index, pic_structure; 00190 00191 print_short_term(h); 00192 print_long_term(h); 00193 00194 for(list=0; list<h->list_count; list++){ 00195 memcpy(h->ref_list[list], h->default_ref_list[list], sizeof(Picture)*h->ref_count[list]); 00196 00197 if(get_bits1(&s->gb)){ 00198 int pred= h->curr_pic_num; 00199 00200 for(index=0; ; index++){ 00201 unsigned int reordering_of_pic_nums_idc= get_ue_golomb_31(&s->gb); 00202 unsigned int pic_id; 00203 int i; 00204 Picture *ref = NULL; 00205 00206 if(reordering_of_pic_nums_idc==3) 00207 break; 00208 00209 if(index >= h->ref_count[list]){ 00210 av_log(h->s.avctx, AV_LOG_ERROR, "reference count overflow\n"); 00211 return -1; 00212 } 00213 00214 if(reordering_of_pic_nums_idc<3){ 00215 if(reordering_of_pic_nums_idc<2){ 00216 const unsigned int abs_diff_pic_num= get_ue_golomb(&s->gb) + 1; 00217 int frame_num; 00218 00219 if(abs_diff_pic_num > h->max_pic_num){ 00220 av_log(h->s.avctx, AV_LOG_ERROR, "abs_diff_pic_num overflow\n"); 00221 return -1; 00222 } 00223 00224 if(reordering_of_pic_nums_idc == 0) pred-= abs_diff_pic_num; 00225 else pred+= abs_diff_pic_num; 00226 pred &= h->max_pic_num - 1; 00227 00228 frame_num = pic_num_extract(h, pred, &pic_structure); 00229 00230 for(i= h->short_ref_count-1; i>=0; i--){ 00231 ref = h->short_ref[i]; 00232 assert(ref->reference); 00233 assert(!ref->long_ref); 00234 if( 00235 ref->frame_num == frame_num && 00236 (ref->reference & pic_structure) 00237 ) 00238 break; 00239 } 00240 if(i>=0) 00241 ref->pic_id= pred; 00242 }else{ 00243 int long_idx; 00244 pic_id= get_ue_golomb(&s->gb); //long_term_pic_idx 00245 00246 long_idx= pic_num_extract(h, pic_id, &pic_structure); 00247 00248 if(long_idx>31){ 00249 av_log(h->s.avctx, AV_LOG_ERROR, "long_term_pic_idx overflow\n"); 00250 return -1; 00251 } 00252 ref = h->long_ref[long_idx]; 00253 assert(!(ref && !ref->reference)); 00254 if(ref && (ref->reference & pic_structure)){ 00255 ref->pic_id= pic_id; 00256 assert(ref->long_ref); 00257 i=0; 00258 }else{ 00259 i=-1; 00260 } 00261 } 00262 00263 if (i < 0) { 00264 av_log(h->s.avctx, AV_LOG_ERROR, "reference picture missing during reorder\n"); 00265 memset(&h->ref_list[list][index], 0, sizeof(Picture)); //FIXME 00266 } else { 00267 for(i=index; i+1<h->ref_count[list]; i++){ 00268 if(ref->long_ref == h->ref_list[list][i].long_ref && ref->pic_id == h->ref_list[list][i].pic_id) 00269 break; 00270 } 00271 for(; i > index; i--){ 00272 h->ref_list[list][i]= h->ref_list[list][i-1]; 00273 } 00274 h->ref_list[list][index]= *ref; 00275 if (FIELD_PICTURE){ 00276 pic_as_field(&h->ref_list[list][index], pic_structure); 00277 } 00278 } 00279 }else{ 00280 av_log(h->s.avctx, AV_LOG_ERROR, "illegal reordering_of_pic_nums_idc\n"); 00281 return -1; 00282 } 00283 } 00284 } 00285 } 00286 for(list=0; list<h->list_count; list++){ 00287 for(index= 0; index < h->ref_count[list]; index++){ 00288 if(!h->ref_list[list][index].data[0]){ 00289 av_log(h->s.avctx, AV_LOG_ERROR, "Missing reference picture\n"); 00290 if(h->default_ref_list[list][0].data[0]) 00291 h->ref_list[list][index]= h->default_ref_list[list][0]; 00292 else 00293 return -1; 00294 } 00295 } 00296 } 00297 00298 return 0; 00299 } 00300 00301 void ff_h264_fill_mbaff_ref_list(H264Context *h){ 00302 int list, i, j; 00303 for(list=0; list<2; list++){ //FIXME try list_count 00304 for(i=0; i<h->ref_count[list]; i++){ 00305 Picture *frame = &h->ref_list[list][i]; 00306 Picture *field = &h->ref_list[list][16+2*i]; 00307 field[0] = *frame; 00308 for(j=0; j<3; j++) 00309 field[0].linesize[j] <<= 1; 00310 field[0].reference = PICT_TOP_FIELD; 00311 field[0].poc= field[0].field_poc[0]; 00312 field[1] = field[0]; 00313 for(j=0; j<3; j++) 00314 field[1].data[j] += frame->linesize[j]; 00315 field[1].reference = PICT_BOTTOM_FIELD; 00316 field[1].poc= field[1].field_poc[1]; 00317 00318 h->luma_weight[16+2*i][list][0] = h->luma_weight[16+2*i+1][list][0] = h->luma_weight[i][list][0]; 00319 h->luma_weight[16+2*i][list][1] = h->luma_weight[16+2*i+1][list][1] = h->luma_weight[i][list][1]; 00320 for(j=0; j<2; j++){ 00321 h->chroma_weight[16+2*i][list][j][0] = h->chroma_weight[16+2*i+1][list][j][0] = h->chroma_weight[i][list][j][0]; 00322 h->chroma_weight[16+2*i][list][j][1] = h->chroma_weight[16+2*i+1][list][j][1] = h->chroma_weight[i][list][j][1]; 00323 } 00324 } 00325 } 00326 } 00327 00339 static inline int unreference_pic(H264Context *h, Picture *pic, int refmask){ 00340 int i; 00341 if (pic->reference &= refmask) { 00342 return 0; 00343 } else { 00344 for(i = 0; h->delayed_pic[i]; i++) 00345 if(pic == h->delayed_pic[i]){ 00346 pic->reference=DELAYED_PIC_REF; 00347 break; 00348 } 00349 return 1; 00350 } 00351 } 00352 00361 static Picture * find_short(H264Context *h, int frame_num, int *idx){ 00362 MpegEncContext * const s = &h->s; 00363 int i; 00364 00365 for(i=0; i<h->short_ref_count; i++){ 00366 Picture *pic= h->short_ref[i]; 00367 if(s->avctx->debug&FF_DEBUG_MMCO) 00368 av_log(h->s.avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic); 00369 if(pic->frame_num == frame_num) { 00370 *idx = i; 00371 return pic; 00372 } 00373 } 00374 return NULL; 00375 } 00376 00383 static void remove_short_at_index(H264Context *h, int i){ 00384 assert(i >= 0 && i < h->short_ref_count); 00385 h->short_ref[i]= NULL; 00386 if (--h->short_ref_count) 00387 memmove(&h->short_ref[i], &h->short_ref[i+1], (h->short_ref_count - i)*sizeof(Picture*)); 00388 } 00389 00394 static Picture * remove_short(H264Context *h, int frame_num, int ref_mask){ 00395 MpegEncContext * const s = &h->s; 00396 Picture *pic; 00397 int i; 00398 00399 if(s->avctx->debug&FF_DEBUG_MMCO) 00400 av_log(h->s.avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count); 00401 00402 pic = find_short(h, frame_num, &i); 00403 if (pic){ 00404 if(unreference_pic(h, pic, ref_mask)) 00405 remove_short_at_index(h, i); 00406 } 00407 00408 return pic; 00409 } 00410 00416 static Picture * remove_long(H264Context *h, int i, int ref_mask){ 00417 Picture *pic; 00418 00419 pic= h->long_ref[i]; 00420 if (pic){ 00421 if(unreference_pic(h, pic, ref_mask)){ 00422 assert(h->long_ref[i]->long_ref == 1); 00423 h->long_ref[i]->long_ref= 0; 00424 h->long_ref[i]= NULL; 00425 h->long_ref_count--; 00426 } 00427 } 00428 00429 return pic; 00430 } 00431 00432 void ff_h264_remove_all_refs(H264Context *h){ 00433 int i; 00434 00435 for(i=0; i<16; i++){ 00436 remove_long(h, i, 0); 00437 } 00438 assert(h->long_ref_count==0); 00439 00440 for(i=0; i<h->short_ref_count; i++){ 00441 unreference_pic(h, h->short_ref[i], 0); 00442 h->short_ref[i]= NULL; 00443 } 00444 h->short_ref_count=0; 00445 } 00446 00450 static void print_short_term(H264Context *h) { 00451 uint32_t i; 00452 if(h->s.avctx->debug&FF_DEBUG_MMCO) { 00453 av_log(h->s.avctx, AV_LOG_DEBUG, "short term list:\n"); 00454 for(i=0; i<h->short_ref_count; i++){ 00455 Picture *pic= h->short_ref[i]; 00456 av_log(h->s.avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n", i, pic->frame_num, pic->poc, pic->data[0]); 00457 } 00458 } 00459 } 00460 00464 static void print_long_term(H264Context *h) { 00465 uint32_t i; 00466 if(h->s.avctx->debug&FF_DEBUG_MMCO) { 00467 av_log(h->s.avctx, AV_LOG_DEBUG, "long term list:\n"); 00468 for(i = 0; i < 16; i++){ 00469 Picture *pic= h->long_ref[i]; 00470 if (pic) { 00471 av_log(h->s.avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n", i, pic->frame_num, pic->poc, pic->data[0]); 00472 } 00473 } 00474 } 00475 } 00476 00477 void ff_generate_sliding_window_mmcos(H264Context *h) { 00478 MpegEncContext * const s = &h->s; 00479 assert(h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count); 00480 00481 h->mmco_index= 0; 00482 if(h->short_ref_count && h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count && 00483 !(FIELD_PICTURE && !s->first_field && s->current_picture_ptr->reference)) { 00484 h->mmco[0].opcode= MMCO_SHORT2UNUSED; 00485 h->mmco[0].short_pic_num= h->short_ref[ h->short_ref_count - 1 ]->frame_num; 00486 h->mmco_index= 1; 00487 if (FIELD_PICTURE) { 00488 h->mmco[0].short_pic_num *= 2; 00489 h->mmco[1].opcode= MMCO_SHORT2UNUSED; 00490 h->mmco[1].short_pic_num= h->mmco[0].short_pic_num + 1; 00491 h->mmco_index= 2; 00492 } 00493 } 00494 } 00495 00496 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count){ 00497 MpegEncContext * const s = &h->s; 00498 int i, av_uninit(j); 00499 int current_ref_assigned=0; 00500 Picture *av_uninit(pic); 00501 00502 if((s->avctx->debug&FF_DEBUG_MMCO) && mmco_count==0) 00503 av_log(h->s.avctx, AV_LOG_DEBUG, "no mmco here\n"); 00504 00505 for(i=0; i<mmco_count; i++){ 00506 int av_uninit(structure), av_uninit(frame_num); 00507 if(s->avctx->debug&FF_DEBUG_MMCO) 00508 av_log(h->s.avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode, h->mmco[i].short_pic_num, h->mmco[i].long_arg); 00509 00510 if( mmco[i].opcode == MMCO_SHORT2UNUSED 00511 || mmco[i].opcode == MMCO_SHORT2LONG){ 00512 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure); 00513 pic = find_short(h, frame_num, &j); 00514 if(!pic){ 00515 if(mmco[i].opcode != MMCO_SHORT2LONG || !h->long_ref[mmco[i].long_arg] 00516 || h->long_ref[mmco[i].long_arg]->frame_num != frame_num) 00517 av_log(h->s.avctx, AV_LOG_ERROR, "mmco: unref short failure\n"); 00518 continue; 00519 } 00520 } 00521 00522 switch(mmco[i].opcode){ 00523 case MMCO_SHORT2UNUSED: 00524 if(s->avctx->debug&FF_DEBUG_MMCO) 00525 av_log(h->s.avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n", h->mmco[i].short_pic_num, h->short_ref_count); 00526 remove_short(h, frame_num, structure ^ PICT_FRAME); 00527 break; 00528 case MMCO_SHORT2LONG: 00529 if (h->long_ref[mmco[i].long_arg] != pic) 00530 remove_long(h, mmco[i].long_arg, 0); 00531 00532 remove_short_at_index(h, j); 00533 h->long_ref[ mmco[i].long_arg ]= pic; 00534 if (h->long_ref[ mmco[i].long_arg ]){ 00535 h->long_ref[ mmco[i].long_arg ]->long_ref=1; 00536 h->long_ref_count++; 00537 } 00538 break; 00539 case MMCO_LONG2UNUSED: 00540 j = pic_num_extract(h, mmco[i].long_arg, &structure); 00541 pic = h->long_ref[j]; 00542 if (pic) { 00543 remove_long(h, j, structure ^ PICT_FRAME); 00544 } else if(s->avctx->debug&FF_DEBUG_MMCO) 00545 av_log(h->s.avctx, AV_LOG_DEBUG, "mmco: unref long failure\n"); 00546 break; 00547 case MMCO_LONG: 00548 // Comment below left from previous code as it is an interresting note. 00549 /* First field in pair is in short term list or 00550 * at a different long term index. 00551 * This is not allowed; see 7.4.3.3, notes 2 and 3. 00552 * Report the problem and keep the pair where it is, 00553 * and mark this field valid. 00554 */ 00555 00556 if (h->long_ref[mmco[i].long_arg] != s->current_picture_ptr) { 00557 remove_long(h, mmco[i].long_arg, 0); 00558 00559 h->long_ref[ mmco[i].long_arg ]= s->current_picture_ptr; 00560 h->long_ref[ mmco[i].long_arg ]->long_ref=1; 00561 h->long_ref_count++; 00562 } 00563 00564 s->current_picture_ptr->reference |= s->picture_structure; 00565 current_ref_assigned=1; 00566 break; 00567 case MMCO_SET_MAX_LONG: 00568 assert(mmco[i].long_arg <= 16); 00569 // just remove the long term which index is greater than new max 00570 for(j = mmco[i].long_arg; j<16; j++){ 00571 remove_long(h, j, 0); 00572 } 00573 break; 00574 case MMCO_RESET: 00575 while(h->short_ref_count){ 00576 remove_short(h, h->short_ref[0]->frame_num, 0); 00577 } 00578 for(j = 0; j < 16; j++) { 00579 remove_long(h, j, 0); 00580 } 00581 s->current_picture_ptr->poc= 00582 s->current_picture_ptr->field_poc[0]= 00583 s->current_picture_ptr->field_poc[1]= 00584 h->poc_lsb= 00585 h->poc_msb= 00586 h->frame_num= 00587 s->current_picture_ptr->frame_num= 0; 00588 s->current_picture_ptr->mmco_reset=1; 00589 break; 00590 default: assert(0); 00591 } 00592 } 00593 00594 if (!current_ref_assigned) { 00595 /* Second field of complementary field pair; the first field of 00596 * which is already referenced. If short referenced, it 00597 * should be first entry in short_ref. If not, it must exist 00598 * in long_ref; trying to put it on the short list here is an 00599 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3). 00600 */ 00601 if (h->short_ref_count && h->short_ref[0] == s->current_picture_ptr) { 00602 /* Just mark the second field valid */ 00603 s->current_picture_ptr->reference = PICT_FRAME; 00604 } else if (s->current_picture_ptr->long_ref) { 00605 av_log(h->s.avctx, AV_LOG_ERROR, "illegal short term reference " 00606 "assignment for second field " 00607 "in complementary field pair " 00608 "(first field is long term)\n"); 00609 } else { 00610 pic= remove_short(h, s->current_picture_ptr->frame_num, 0); 00611 if(pic){ 00612 av_log(h->s.avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n"); 00613 } 00614 00615 if(h->short_ref_count) 00616 memmove(&h->short_ref[1], &h->short_ref[0], h->short_ref_count*sizeof(Picture*)); 00617 00618 h->short_ref[0]= s->current_picture_ptr; 00619 h->short_ref_count++; 00620 s->current_picture_ptr->reference |= s->picture_structure; 00621 } 00622 } 00623 00624 if (h->long_ref_count + h->short_ref_count - 00625 (h->short_ref[0] == s->current_picture_ptr) > h->sps.ref_frame_count){ 00626 00627 /* We have too many reference frames, probably due to corrupted 00628 * stream. Need to discard one frame. Prevents overrun of the 00629 * short_ref and long_ref buffers. 00630 */ 00631 av_log(h->s.avctx, AV_LOG_ERROR, 00632 "number of reference frames (%d+%d) exceeds max (%d; probably " 00633 "corrupt input), discarding one\n", 00634 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count); 00635 00636 if (h->long_ref_count && !h->short_ref_count) { 00637 for (i = 0; i < 16; ++i) 00638 if (h->long_ref[i]) 00639 break; 00640 00641 assert(i < 16); 00642 remove_long(h, i, 0); 00643 } else { 00644 pic = h->short_ref[h->short_ref_count - 1]; 00645 remove_short(h, pic->frame_num, 0); 00646 } 00647 } 00648 00649 print_short_term(h); 00650 print_long_term(h); 00651 return 0; 00652 } 00653 00654 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb){ 00655 MpegEncContext * const s = &h->s; 00656 int i; 00657 00658 h->mmco_index= 0; 00659 if(h->nal_unit_type == NAL_IDR_SLICE){ //FIXME fields 00660 s->broken_link= get_bits1(gb) -1; 00661 if(get_bits1(gb)){ 00662 h->mmco[0].opcode= MMCO_LONG; 00663 h->mmco[0].long_arg= 0; 00664 h->mmco_index= 1; 00665 } 00666 }else{ 00667 if(get_bits1(gb)){ // adaptive_ref_pic_marking_mode_flag 00668 for(i= 0; i<MAX_MMCO_COUNT; i++) { 00669 MMCOOpcode opcode= get_ue_golomb_31(gb); 00670 00671 h->mmco[i].opcode= opcode; 00672 if(opcode==MMCO_SHORT2UNUSED || opcode==MMCO_SHORT2LONG){ 00673 h->mmco[i].short_pic_num= (h->curr_pic_num - get_ue_golomb(gb) - 1) & (h->max_pic_num - 1); 00674 /* if(h->mmco[i].short_pic_num >= h->short_ref_count || h->short_ref[ h->mmco[i].short_pic_num ] == NULL){ 00675 av_log(s->avctx, AV_LOG_ERROR, "illegal short ref in memory management control operation %d\n", mmco); 00676 return -1; 00677 }*/ 00678 } 00679 if(opcode==MMCO_SHORT2LONG || opcode==MMCO_LONG2UNUSED || opcode==MMCO_LONG || opcode==MMCO_SET_MAX_LONG){ 00680 unsigned int long_arg= get_ue_golomb_31(gb); 00681 if(long_arg >= 32 || (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG && long_arg == 16) && !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE))){ 00682 av_log(h->s.avctx, AV_LOG_ERROR, "illegal long ref in memory management control operation %d\n", opcode); 00683 return -1; 00684 } 00685 h->mmco[i].long_arg= long_arg; 00686 } 00687 00688 if(opcode > (unsigned)MMCO_LONG){ 00689 av_log(h->s.avctx, AV_LOG_ERROR, "illegal memory management control operation %d\n", opcode); 00690 return -1; 00691 } 00692 if(opcode == MMCO_END) 00693 break; 00694 } 00695 h->mmco_index= i; 00696 }else{ 00697 ff_generate_sliding_window_mmcos(h); 00698 } 00699 } 00700 00701 return 0; 00702 }