LCOV - code coverage report
Current view: top level - libavcodec - hevc_refs.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 262 299 87.6 %
Date: 2017-12-14 01:15:32 Functions: 15 16 93.8 %

          Line data    Source code
       1             : /*
       2             :  * HEVC video decoder
       3             :  *
       4             :  * Copyright (C) 2012 - 2013 Guillaume Martres
       5             :  * Copyright (C) 2012 - 2013 Gildas Cocherel
       6             :  *
       7             :  * This file is part of FFmpeg.
       8             :  *
       9             :  * FFmpeg is free software; you can redistribute it and/or
      10             :  * modify it under the terms of the GNU Lesser General Public
      11             :  * License as published by the Free Software Foundation; either
      12             :  * version 2.1 of the License, or (at your option) any later version.
      13             :  *
      14             :  * FFmpeg is distributed in the hope that it will be useful,
      15             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      16             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      17             :  * Lesser General Public License for more details.
      18             :  *
      19             :  * You should have received a copy of the GNU Lesser General Public
      20             :  * License along with FFmpeg; if not, write to the Free Software
      21             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      22             :  */
      23             : 
      24             : #include "libavutil/avassert.h"
      25             : #include "libavutil/pixdesc.h"
      26             : 
      27             : #include "internal.h"
      28             : #include "thread.h"
      29             : #include "hevc.h"
      30             : #include "hevcdec.h"
      31             : 
      32      334299 : void ff_hevc_unref_frame(HEVCContext *s, HEVCFrame *frame, int flags)
      33             : {
      34             :     /* frame->frame can be NULL if context init failed */
      35      334299 :     if (!frame->frame || !frame->frame->buf[0])
      36      269647 :         return;
      37             : 
      38       64652 :     frame->flags &= ~flags;
      39       64652 :     if (!frame->flags) {
      40        9480 :         ff_thread_release_buffer(s->avctx, &frame->tf);
      41             : 
      42        9480 :         av_buffer_unref(&frame->tab_mvf_buf);
      43        9480 :         frame->tab_mvf = NULL;
      44             : 
      45        9480 :         av_buffer_unref(&frame->rpl_buf);
      46        9480 :         av_buffer_unref(&frame->rpl_tab_buf);
      47        9480 :         frame->rpl_tab    = NULL;
      48        9480 :         frame->refPicList = NULL;
      49             : 
      50        9480 :         frame->collocated_ref = NULL;
      51             : 
      52        9480 :         av_buffer_unref(&frame->hwaccel_priv_buf);
      53        9480 :         frame->hwaccel_picture_private = NULL;
      54             :     }
      55             : }
      56             : 
      57     4555450 : RefPicList *ff_hevc_get_ref_list(HEVCContext *s, HEVCFrame *ref, int x0, int y0)
      58             : {
      59     4555450 :     int x_cb         = x0 >> s->ps.sps->log2_ctb_size;
      60     4555450 :     int y_cb         = y0 >> s->ps.sps->log2_ctb_size;
      61     4555450 :     int pic_width_cb = s->ps.sps->ctb_width;
      62     4555450 :     int ctb_addr_ts  = s->ps.pps->ctb_addr_rs_to_ts[y_cb * pic_width_cb + x_cb];
      63     4555450 :     return (RefPicList *)ref->rpl_tab[ctb_addr_ts];
      64             : }
      65             : 
      66         714 : void ff_hevc_clear_refs(HEVCContext *s)
      67             : {
      68             :     int i;
      69       23562 :     for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
      70       22848 :         ff_hevc_unref_frame(s, &s->DPB[i],
      71             :                             HEVC_FRAME_FLAG_SHORT_REF |
      72             :                             HEVC_FRAME_FLAG_LONG_REF);
      73         714 : }
      74             : 
      75           0 : void ff_hevc_flush_dpb(HEVCContext *s)
      76             : {
      77             :     int i;
      78           0 :     for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
      79           0 :         ff_hevc_unref_frame(s, &s->DPB[i], ~0);
      80           0 : }
      81             : 
      82        9480 : static HEVCFrame *alloc_frame(HEVCContext *s)
      83             : {
      84             :     int i, j, ret;
      85       67080 :     for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
      86       33540 :         HEVCFrame *frame = &s->DPB[i];
      87       33540 :         if (frame->frame->buf[0])
      88       24060 :             continue;
      89             : 
      90        9480 :         ret = ff_thread_get_buffer(s->avctx, &frame->tf,
      91             :                                    AV_GET_BUFFER_FLAG_REF);
      92        9480 :         if (ret < 0)
      93           0 :             return NULL;
      94             : 
      95        9480 :         frame->rpl_buf = av_buffer_allocz(s->pkt.nb_nals * sizeof(RefPicListTab));
      96        9480 :         if (!frame->rpl_buf)
      97           0 :             goto fail;
      98             : 
      99        9480 :         frame->tab_mvf_buf = av_buffer_pool_get(s->tab_mvf_pool);
     100        9480 :         if (!frame->tab_mvf_buf)
     101           0 :             goto fail;
     102        9480 :         frame->tab_mvf = (MvField *)frame->tab_mvf_buf->data;
     103             : 
     104        9480 :         frame->rpl_tab_buf = av_buffer_pool_get(s->rpl_tab_pool);
     105        9480 :         if (!frame->rpl_tab_buf)
     106           0 :             goto fail;
     107        9480 :         frame->rpl_tab   = (RefPicListTab **)frame->rpl_tab_buf->data;
     108        9480 :         frame->ctb_count = s->ps.sps->ctb_width * s->ps.sps->ctb_height;
     109     1375081 :         for (j = 0; j < frame->ctb_count; j++)
     110     1365601 :             frame->rpl_tab[j] = (RefPicListTab *)frame->rpl_buf->data;
     111             : 
     112        9480 :         frame->frame->top_field_first  = s->sei.picture_timing.picture_struct == AV_PICTURE_STRUCTURE_TOP_FIELD;
     113        9480 :         frame->frame->interlaced_frame = (s->sei.picture_timing.picture_struct == AV_PICTURE_STRUCTURE_TOP_FIELD) || (s->sei.picture_timing.picture_struct == AV_PICTURE_STRUCTURE_BOTTOM_FIELD);
     114             : 
     115        9480 :         if (s->avctx->hwaccel) {
     116           0 :             const AVHWAccel *hwaccel = s->avctx->hwaccel;
     117           0 :             av_assert0(!frame->hwaccel_picture_private);
     118           0 :             if (hwaccel->frame_priv_data_size) {
     119           0 :                 frame->hwaccel_priv_buf = av_buffer_allocz(hwaccel->frame_priv_data_size);
     120           0 :                 if (!frame->hwaccel_priv_buf)
     121           0 :                     goto fail;
     122           0 :                 frame->hwaccel_picture_private = frame->hwaccel_priv_buf->data;
     123             :             }
     124             :         }
     125             : 
     126        9480 :         return frame;
     127           0 : fail:
     128           0 :         ff_hevc_unref_frame(s, frame, ~0);
     129           0 :         return NULL;
     130             :     }
     131           0 :     av_log(s->avctx, AV_LOG_ERROR, "Error allocating frame, DPB full.\n");
     132           0 :     return NULL;
     133             : }
     134             : 
     135        9439 : int ff_hevc_set_new_ref(HEVCContext *s, AVFrame **frame, int poc)
     136             : {
     137             :     HEVCFrame *ref;
     138             :     int i;
     139             : 
     140             :     /* check that this POC doesn't already exist */
     141      311487 :     for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
     142      302048 :         HEVCFrame *frame = &s->DPB[i];
     143             : 
     144      347298 :         if (frame->frame->buf[0] && frame->sequence == s->seq_decode &&
     145       45250 :             frame->poc == poc) {
     146           0 :             av_log(s->avctx, AV_LOG_ERROR, "Duplicate POC in a sequence: %d.\n",
     147             :                    poc);
     148           0 :             return AVERROR_INVALIDDATA;
     149             :         }
     150             :     }
     151             : 
     152        9439 :     ref = alloc_frame(s);
     153        9439 :     if (!ref)
     154           0 :         return AVERROR(ENOMEM);
     155             : 
     156        9439 :     *frame = ref->frame;
     157        9439 :     s->ref = ref;
     158             : 
     159        9439 :     if (s->sh.pic_output_flag)
     160        9433 :         ref->flags = HEVC_FRAME_FLAG_OUTPUT | HEVC_FRAME_FLAG_SHORT_REF;
     161             :     else
     162           6 :         ref->flags = HEVC_FRAME_FLAG_SHORT_REF;
     163             : 
     164        9439 :     ref->poc      = poc;
     165        9439 :     ref->sequence = s->seq_decode;
     166        9439 :     ref->frame->crop_left   = s->ps.sps->output_window.left_offset;
     167        9439 :     ref->frame->crop_right  = s->ps.sps->output_window.right_offset;
     168        9439 :     ref->frame->crop_top    = s->ps.sps->output_window.top_offset;
     169        9439 :     ref->frame->crop_bottom = s->ps.sps->output_window.bottom_offset;
     170             : 
     171        9439 :     return 0;
     172             : }
     173             : 
     174       10630 : int ff_hevc_output_frame(HEVCContext *s, AVFrame *out, int flush)
     175             : {
     176         728 :     do {
     177       10630 :         int nb_output = 0;
     178       10630 :         int min_poc   = INT_MAX;
     179             :         int i, min_idx, ret;
     180             : 
     181       10630 :         if (s->sh.no_output_of_prior_pics_flag == 1 && s->no_rasl_output_flag == 1) {
     182        1155 :             for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
     183        1120 :                 HEVCFrame *frame = &s->DPB[i];
     184        1776 :                 if (!(frame->flags & HEVC_FRAME_FLAG_BUMPING) && frame->poc != s->poc &&
     185         656 :                         frame->sequence == s->seq_output) {
     186         176 :                     ff_hevc_unref_frame(s, frame, HEVC_FRAME_FLAG_OUTPUT);
     187             :                 }
     188             :             }
     189             :         }
     190             : 
     191      350790 :         for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
     192      340160 :             HEVCFrame *frame = &s->DPB[i];
     193      372826 :             if ((frame->flags & HEVC_FRAME_FLAG_OUTPUT) &&
     194       32666 :                 frame->sequence == s->seq_output) {
     195       31788 :                 nb_output++;
     196       31788 :                 if (frame->poc < min_poc || nb_output == 1) {
     197       16742 :                     min_poc = frame->poc;
     198       16742 :                     min_idx = i;
     199             :                 }
     200             :             }
     201             :         }
     202             : 
     203             :         /* wait for more frames before output */
     204       20025 :         if (!flush && s->seq_output == s->seq_decode && s->ps.sps &&
     205        9395 :             nb_output <= s->ps.sps->temporal_layer[s->ps.sps->max_sub_layers - 1].num_reorder_pics)
     206         445 :             return 0;
     207             : 
     208       10185 :         if (nb_output) {
     209        9291 :             HEVCFrame *frame = &s->DPB[min_idx];
     210             : 
     211        9291 :             if (frame->frame->format == AV_PIX_FMT_VIDEOTOOLBOX && frame->frame->buf[0]->size == 1)
     212           0 :                 return 0;
     213             : 
     214        9291 :             ret = av_frame_ref(out, frame->frame);
     215        9291 :             if (frame->flags & HEVC_FRAME_FLAG_BUMPING)
     216        2039 :                 ff_hevc_unref_frame(s, frame, HEVC_FRAME_FLAG_OUTPUT | HEVC_FRAME_FLAG_BUMPING);
     217             :             else
     218        7252 :                 ff_hevc_unref_frame(s, frame, HEVC_FRAME_FLAG_OUTPUT);
     219        9291 :             if (ret < 0)
     220           0 :                 return ret;
     221             : 
     222        9291 :             av_log(s->avctx, AV_LOG_DEBUG,
     223             :                    "Output frame with POC %d.\n", frame->poc);
     224        9291 :             return 1;
     225             :         }
     226             : 
     227         894 :         if (s->seq_output != s->seq_decode)
     228         728 :             s->seq_output = (s->seq_output + 1) & 0xff;
     229             :         else
     230         166 :             break;
     231             :     } while (1);
     232             : 
     233         166 :     return 0;
     234             : }
     235             : 
     236        8920 : void ff_hevc_bump_frame(HEVCContext *s)
     237             : {
     238        8920 :     int dpb = 0;
     239        8920 :     int min_poc = INT_MAX;
     240             :     int i;
     241             : 
     242      294360 :     for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
     243      285440 :         HEVCFrame *frame = &s->DPB[i];
     244      332897 :         if ((frame->flags) &&
     245       94798 :             frame->sequence == s->seq_output &&
     246       47341 :             frame->poc != s->poc) {
     247       38458 :             dpb++;
     248             :         }
     249             :     }
     250             : 
     251        8920 :     if (s->ps.sps && dpb >= s->ps.sps->temporal_layer[s->ps.sps->max_sub_layers - 1].max_dec_pic_buffering) {
     252       56001 :         for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
     253       54304 :             HEVCFrame *frame = &s->DPB[i];
     254       64622 :             if ((frame->flags) &&
     255       20636 :                 frame->sequence == s->seq_output &&
     256       10318 :                 frame->poc != s->poc) {
     257        8621 :                 if (frame->flags == HEVC_FRAME_FLAG_OUTPUT && frame->poc < min_poc) {
     258        1444 :                     min_poc = frame->poc;
     259             :                 }
     260             :             }
     261             :         }
     262             : 
     263       56001 :         for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
     264       54304 :             HEVCFrame *frame = &s->DPB[i];
     265       61094 :             if (frame->flags & HEVC_FRAME_FLAG_OUTPUT &&
     266       13580 :                 frame->sequence == s->seq_output &&
     267        6790 :                 frame->poc <= min_poc) {
     268        2789 :                 frame->flags |= HEVC_FRAME_FLAG_BUMPING;
     269             :             }
     270             :         }
     271             : 
     272        1697 :         dpb--;
     273             :     }
     274        8920 : }
     275             : 
     276       18369 : static int init_slice_rpl(HEVCContext *s)
     277             : {
     278       18369 :     HEVCFrame *frame = s->ref;
     279       18369 :     int ctb_count    = frame->ctb_count;
     280       18369 :     int ctb_addr_ts  = s->ps.pps->ctb_addr_rs_to_ts[s->sh.slice_segment_addr];
     281             :     int i;
     282             : 
     283       18369 :     if (s->slice_idx >= frame->rpl_buf->size / sizeof(RefPicListTab))
     284           0 :         return AVERROR_INVALIDDATA;
     285             : 
     286     1958069 :     for (i = ctb_addr_ts; i < ctb_count; i++)
     287     1939700 :         frame->rpl_tab[i] = (RefPicListTab *)frame->rpl_buf->data + s->slice_idx;
     288             : 
     289       18369 :     frame->refPicList = (RefPicList *)frame->rpl_tab[ctb_addr_ts];
     290             : 
     291       18369 :     return 0;
     292             : }
     293             : 
     294       18369 : int ff_hevc_slice_rpl(HEVCContext *s)
     295             : {
     296       18369 :     SliceHeader *sh = &s->sh;
     297             : 
     298       18369 :     uint8_t nb_list = sh->slice_type == HEVC_SLICE_B ? 2 : 1;
     299             :     uint8_t list_idx;
     300             :     int i, j, ret;
     301             : 
     302       18369 :     ret = init_slice_rpl(s);
     303       18369 :     if (ret < 0)
     304           0 :         return ret;
     305             : 
     306       36738 :     if (!(s->rps[ST_CURR_BEF].nb_refs + s->rps[ST_CURR_AFT].nb_refs +
     307       18369 :           s->rps[LT_CURR].nb_refs)) {
     308           0 :         av_log(s->avctx, AV_LOG_ERROR, "Zero refs in the frame RPS.\n");
     309           0 :         return AVERROR_INVALIDDATA;
     310             :     }
     311             : 
     312       51398 :     for (list_idx = 0; list_idx < nb_list; list_idx++) {
     313       33029 :         RefPicList  rpl_tmp = { { 0 } };
     314       33029 :         RefPicList *rpl     = &s->ref->refPicList[list_idx];
     315             : 
     316             :         /* The order of the elements is
     317             :          * ST_CURR_BEF - ST_CURR_AFT - LT_CURR for the L0 and
     318             :          * ST_CURR_AFT - ST_CURR_BEF - LT_CURR for the L1 */
     319       66058 :         int cand_lists[3] = { list_idx ? ST_CURR_AFT : ST_CURR_BEF,
     320       33029 :                               list_idx ? ST_CURR_BEF : ST_CURR_AFT,
     321             :                               LT_CURR };
     322             : 
     323             :         /* concatenate the candidate lists for the current frame */
     324       99105 :         while (rpl_tmp.nb_refs < sh->nb_refs[list_idx]) {
     325      132188 :             for (i = 0; i < FF_ARRAY_ELEMS(cand_lists); i++) {
     326       99141 :                 RefPicList *rps = &s->rps[cand_lists[i]];
     327      218753 :                 for (j = 0; j < rps->nb_refs && rpl_tmp.nb_refs < HEVC_MAX_REFS; j++) {
     328      119612 :                     rpl_tmp.list[rpl_tmp.nb_refs]       = rps->list[j];
     329      119612 :                     rpl_tmp.ref[rpl_tmp.nb_refs]        = rps->ref[j];
     330      119612 :                     rpl_tmp.isLongTerm[rpl_tmp.nb_refs] = i == 2;
     331      119612 :                     rpl_tmp.nb_refs++;
     332             :                 }
     333             :             }
     334             :         }
     335             : 
     336             :         /* reorder the references if necessary */
     337       33029 :         if (sh->rpl_modification_flag[list_idx]) {
     338        6160 :             for (i = 0; i < sh->nb_refs[list_idx]; i++) {
     339        4333 :                 int idx = sh->list_entry_lx[list_idx][i];
     340             : 
     341        4333 :                 if (idx >= rpl_tmp.nb_refs) {
     342           0 :                     av_log(s->avctx, AV_LOG_ERROR, "Invalid reference index.\n");
     343           0 :                     return AVERROR_INVALIDDATA;
     344             :                 }
     345             : 
     346        4333 :                 rpl->list[i]       = rpl_tmp.list[idx];
     347        4333 :                 rpl->ref[i]        = rpl_tmp.ref[idx];
     348        4333 :                 rpl->isLongTerm[i] = rpl_tmp.isLongTerm[idx];
     349        4333 :                 rpl->nb_refs++;
     350             :             }
     351             :         } else {
     352       31202 :             memcpy(rpl, &rpl_tmp, sizeof(*rpl));
     353       31202 :             rpl->nb_refs = FFMIN(rpl->nb_refs, sh->nb_refs[list_idx]);
     354             :         }
     355             : 
     356       51398 :         if (sh->collocated_list == list_idx &&
     357       18369 :             sh->collocated_ref_idx < rpl->nb_refs)
     358       18369 :             s->ref->collocated_ref = rpl->ref[sh->collocated_ref_idx];
     359             :     }
     360             : 
     361       18369 :     return 0;
     362             : }
     363             : 
     364       35000 : static HEVCFrame *find_ref_idx(HEVCContext *s, int poc)
     365             : {
     366             :     int i;
     367       35000 :     int LtMask = (1 << s->ps.sps->log2_max_poc_lsb) - 1;
     368             : 
     369      260559 :     for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
     370      256685 :         HEVCFrame *ref = &s->DPB[i];
     371      256685 :         if (ref->frame->buf[0] && (ref->sequence == s->seq_decode)) {
     372      155743 :             if ((ref->poc & LtMask) == poc)
     373       31126 :                 return ref;
     374             :         }
     375             :     }
     376             : 
     377       18847 :     for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
     378       18806 :         HEVCFrame *ref = &s->DPB[i];
     379       18806 :         if (ref->frame->buf[0] && ref->sequence == s->seq_decode) {
     380       16747 :             if (ref->poc == poc || (ref->poc & LtMask) == poc)
     381        3833 :                 return ref;
     382             :         }
     383             :     }
     384             : 
     385          41 :     if (s->nal_unit_type != HEVC_NAL_CRA_NUT && !IS_BLA(s))
     386           7 :         av_log(s->avctx, AV_LOG_ERROR,
     387             :                "Could not find ref with POC %d\n", poc);
     388          41 :     return NULL;
     389             : }
     390             : 
     391      316542 : static void mark_ref(HEVCFrame *frame, int flag)
     392             : {
     393      316542 :     frame->flags &= ~(HEVC_FRAME_FLAG_LONG_REF | HEVC_FRAME_FLAG_SHORT_REF);
     394      316542 :     frame->flags |= flag;
     395      316542 : }
     396             : 
     397          41 : static HEVCFrame *generate_missing_ref(HEVCContext *s, int poc)
     398             : {
     399             :     HEVCFrame *frame;
     400             :     int i, x, y;
     401             : 
     402          41 :     frame = alloc_frame(s);
     403          41 :     if (!frame)
     404           0 :         return NULL;
     405             : 
     406          41 :     if (!s->avctx->hwaccel) {
     407          41 :         if (!s->ps.sps->pixel_shift) {
     408         116 :             for (i = 0; frame->frame->buf[i]; i++)
     409          87 :                 memset(frame->frame->buf[i]->data, 1 << (s->ps.sps->bit_depth - 1),
     410          87 :                        frame->frame->buf[i]->size);
     411             :         } else {
     412          48 :             for (i = 0; frame->frame->data[i]; i++)
     413       19620 :                 for (y = 0; y < (s->ps.sps->height >> s->ps.sps->vshift[i]); y++)
     414    25087104 :                     for (x = 0; x < (s->ps.sps->width >> s->ps.sps->hshift[i]); x++) {
     415    25067520 :                         AV_WN16(frame->frame->data[i] + y * frame->frame->linesize[i] + 2 * x,
     416             :                                 1 << (s->ps.sps->bit_depth - 1));
     417             :                     }
     418             :         }
     419             :     }
     420             : 
     421          41 :     frame->poc      = poc;
     422          41 :     frame->sequence = s->seq_decode;
     423          41 :     frame->flags    = 0;
     424             : 
     425          41 :     if (s->threads_type == FF_THREAD_FRAME)
     426           0 :         ff_thread_report_progress(&frame->tf, INT_MAX, 0);
     427             : 
     428          41 :     return frame;
     429             : }
     430             : 
     431             : /* add a reference with the given poc to the list and mark it as used in DPB */
     432       35000 : static int add_candidate_ref(HEVCContext *s, RefPicList *list,
     433             :                              int poc, int ref_flag)
     434             : {
     435       35000 :     HEVCFrame *ref = find_ref_idx(s, poc);
     436             : 
     437       35000 :     if (ref == s->ref || list->nb_refs >= HEVC_MAX_REFS)
     438           0 :         return AVERROR_INVALIDDATA;
     439             : 
     440       35000 :     if (!ref) {
     441          41 :         ref = generate_missing_ref(s, poc);
     442          41 :         if (!ref)
     443           0 :             return AVERROR(ENOMEM);
     444             :     }
     445             : 
     446       35000 :     list->list[list->nb_refs] = ref->poc;
     447       35000 :     list->ref[list->nb_refs]  = ref;
     448       35000 :     list->nb_refs++;
     449             : 
     450       35000 :     mark_ref(ref, ref_flag);
     451       35000 :     return 0;
     452             : }
     453             : 
     454        9439 : int ff_hevc_frame_rps(HEVCContext *s)
     455             : {
     456        9439 :     const ShortTermRPS *short_rps = s->sh.short_term_rps;
     457        9439 :     const LongTermRPS  *long_rps  = &s->sh.long_term_rps;
     458        9439 :     RefPicList               *rps = s->rps;
     459        9439 :     int i, ret = 0;
     460             : 
     461        9439 :     if (!short_rps) {
     462         357 :         rps[0].nb_refs = rps[1].nb_refs = 0;
     463         357 :         return 0;
     464             :     }
     465             : 
     466             :     /* clear the reference flags on all frames except the current one */
     467      299706 :     for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
     468      290624 :         HEVCFrame *frame = &s->DPB[i];
     469             : 
     470      290624 :         if (frame == s->ref)
     471        9082 :             continue;
     472             : 
     473      281542 :         mark_ref(frame, 0);
     474             :     }
     475             : 
     476       54492 :     for (i = 0; i < NB_RPS_TYPE; i++)
     477       45410 :         rps[i].nb_refs = 0;
     478             : 
     479             :     /* add the short refs */
     480       42551 :     for (i = 0; i < short_rps->num_delta_pocs; i++) {
     481       33469 :         int poc = s->poc + short_rps->delta_poc[i];
     482             :         int list;
     483             : 
     484       33469 :         if (!short_rps->used[i])
     485        1710 :             list = ST_FOLL;
     486       31759 :         else if (i < short_rps->num_negative_pics)
     487       23164 :             list = ST_CURR_BEF;
     488             :         else
     489        8595 :             list = ST_CURR_AFT;
     490             : 
     491       33469 :         ret = add_candidate_ref(s, &rps[list], poc, HEVC_FRAME_FLAG_SHORT_REF);
     492       33469 :         if (ret < 0)
     493           0 :             goto fail;
     494             :     }
     495             : 
     496             :     /* add the long refs */
     497       10613 :     for (i = 0; i < long_rps->nb_refs; i++) {
     498        1531 :         int poc  = long_rps->poc[i];
     499        1531 :         int list = long_rps->used[i] ? LT_CURR : LT_FOLL;
     500             : 
     501        1531 :         ret = add_candidate_ref(s, &rps[list], poc, HEVC_FRAME_FLAG_LONG_REF);
     502        1531 :         if (ret < 0)
     503           0 :             goto fail;
     504             :     }
     505             : 
     506        9082 : fail:
     507             :     /* release any frames that are now unused */
     508      299706 :     for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
     509      290624 :         ff_hevc_unref_frame(s, &s->DPB[i], 0);
     510             : 
     511        9082 :     return ret;
     512             : }
     513             : 
     514       18398 : int ff_hevc_frame_nb_refs(HEVCContext *s)
     515             : {
     516       18398 :     int ret = 0;
     517             :     int i;
     518       18398 :     const ShortTermRPS *rps = s->sh.short_term_rps;
     519       18398 :     LongTermRPS *long_rps   = &s->sh.long_term_rps;
     520             : 
     521       18398 :     if (rps) {
     522       63656 :         for (i = 0; i < rps->num_negative_pics; i++)
     523       45258 :             ret += !!rps->used[i];
     524       38662 :         for (; i < rps->num_delta_pocs; i++)
     525       20264 :             ret += !!rps->used[i];
     526             :     }
     527             : 
     528       18398 :     if (long_rps) {
     529       19788 :         for (i = 0; i < long_rps->nb_refs; i++)
     530        1390 :             ret += !!long_rps->used[i];
     531             :     }
     532       18398 :     return ret;
     533             : }

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