libavcodec/vaapi_hevc.c - nest-android-app/ffmpeg - Git at Google

 /*
  * HEVC HW decode acceleration through VA API
  *
  * Copyright (C) 2015 Timo Rothenpieler <timo@rothenpieler.org>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */

 #include "vaapi_internal.h"
 #include "hevc.h"
 #include "mpegutils.h"

 /**
  * @file
  * This file implements the glue code between FFmpeg's and VA API's
  * structures for HEVC decoding.
  */

 typedef struct vaapi_hevc_frame_data {
     VAPictureParameterBufferHEVC *pic_param;
     VASliceParameterBufferHEVC *last_slice_param;
 } vaapi_hevc_frame_data;

 /**
  * Initialize an empty VA API picture.
  *
  * VA API requires a fixed-size reference picture array.
  */
 static void init_vaapi_pic(VAPictureHEVC *va_pic)
 {
     va_pic->picture_id = VA_INVALID_ID;
     va_pic->flags = VA_PICTURE_HEVC_INVALID;
     va_pic->pic_order_cnt = 0;
 }

 static void fill_vaapi_pic(VAPictureHEVC *va_pic, const HEVCFrame *pic, int rps_type)
 {
     va_pic->picture_id = ff_vaapi_get_surface_id(pic->frame);
     va_pic->pic_order_cnt = pic->poc;
     va_pic->flags = rps_type;

     if (pic->flags & HEVC_FRAME_FLAG_LONG_REF)
         va_pic->flags |= VA_PICTURE_HEVC_LONG_TERM_REFERENCE;

     if (pic->frame->interlaced_frame) {
         va_pic->flags |= VA_PICTURE_HEVC_FIELD_PIC;

         if (!pic->frame->top_field_first) {
             va_pic->flags |= VA_PICTURE_HEVC_BOTTOM_FIELD;
         }
     }
 }

 static int find_frame_rps_type(const HEVCContext *h, const HEVCFrame *pic)
 {
     VASurfaceID pic_surf = ff_vaapi_get_surface_id(pic->frame);
     int i;

     for (i = 0; i < h->rps[ST_CURR_BEF].nb_refs; ++i) {
         if (pic_surf == ff_vaapi_get_surface_id(h->rps[ST_CURR_BEF].ref[i]->frame))
             return VA_PICTURE_HEVC_RPS_ST_CURR_BEFORE;
     }

     for (i = 0; i < h->rps[ST_CURR_AFT].nb_refs; ++i) {
         if (pic_surf == ff_vaapi_get_surface_id(h->rps[ST_CURR_AFT].ref[i]->frame))
             return VA_PICTURE_HEVC_RPS_ST_CURR_AFTER;
     }

     for (i = 0; i < h->rps[LT_CURR].nb_refs; ++i) {
         if (pic_surf == ff_vaapi_get_surface_id(h->rps[LT_CURR].ref[i]->frame))
             return VA_PICTURE_HEVC_RPS_LT_CURR;
     }

     return 0;
 }

 static void fill_vaapi_ReferenceFrames(const HEVCContext *h, VAPictureParameterBufferHEVC *pp)
 {
     const HEVCFrame *current_picture = h->ref;
     int i, j, rps_type;

     for (i = 0, j = 0; i < FF_ARRAY_ELEMS(pp->ReferenceFrames); i++) {
         const HEVCFrame *frame = NULL;

         while (!frame && j < FF_ARRAY_ELEMS(h->DPB)) {
             if (&h->DPB[j] != current_picture && (h->DPB[j].flags & (HEVC_FRAME_FLAG_LONG_REF | HEVC_FRAME_FLAG_SHORT_REF)))
                 frame = &h->DPB[j];
             j++;
         }

         init_vaapi_pic(&pp->ReferenceFrames[i]);

         if (frame) {
             rps_type = find_frame_rps_type(h, frame);
             fill_vaapi_pic(&pp->ReferenceFrames[i], frame, rps_type);
         }
     }
 }

 static uint8_t get_ref_pic_index(const HEVCContext *h, const HEVCFrame *frame)
 {
     vaapi_hevc_frame_data *frame_data = h->ref->hwaccel_picture_private;
     VAPictureParameterBufferHEVC *pp = frame_data->pic_param;
     uint8_t i;

     if (!frame)
         return 0xff;

     for (i = 0; i < FF_ARRAY_ELEMS(pp->ReferenceFrames); ++i) {
         VASurfaceID pid = pp->ReferenceFrames[i].picture_id;
         int poc = pp->ReferenceFrames[i].pic_order_cnt;
         if (pid != VA_INVALID_ID && pid == ff_vaapi_get_surface_id(frame->frame) && poc == frame->poc)
             return i;
     }

     return 0xff;
 }

 static void fill_picture_parameters(const HEVCContext *h, VAPictureParameterBufferHEVC *pp)
 {
     int i;

     pp->pic_fields.value = 0;
     pp->slice_parsing_fields.value = 0;

     fill_vaapi_pic(&pp->CurrPic, h->ref, 0);
     fill_vaapi_ReferenceFrames(h, pp);

     pp->pic_width_in_luma_samples  = h->ps.sps->width;
     pp->pic_height_in_luma_samples = h->ps.sps->height;

     pp->log2_min_luma_coding_block_size_minus3 = h->ps.sps->log2_min_cb_size - 3;

     pp->pic_fields.bits.chroma_format_idc = h->ps.sps->chroma_format_idc;

     pp->sps_max_dec_pic_buffering_minus1 = h->ps.sps->temporal_layer[h->ps.sps->max_sub_layers - 1].max_dec_pic_buffering - 1;
     pp->log2_diff_max_min_luma_coding_block_size = h->ps.sps->log2_diff_max_min_coding_block_size;
     pp->log2_min_transform_block_size_minus2 = h->ps.sps->log2_min_tb_size - 2;
     pp->log2_diff_max_min_transform_block_size = h->ps.sps->log2_max_trafo_size  - h->ps.sps->log2_min_tb_size;
     pp->max_transform_hierarchy_depth_inter = h->ps.sps->max_transform_hierarchy_depth_inter;
     pp->max_transform_hierarchy_depth_intra = h->ps.sps->max_transform_hierarchy_depth_intra;
     pp->num_short_term_ref_pic_sets = h->ps.sps->nb_st_rps;
     pp->num_long_term_ref_pic_sps = h->ps.sps->num_long_term_ref_pics_sps;

     pp->num_ref_idx_l0_default_active_minus1 = h->ps.pps->num_ref_idx_l0_default_active - 1;
     pp->num_ref_idx_l1_default_active_minus1 = h->ps.pps->num_ref_idx_l1_default_active - 1;
     pp->init_qp_minus26 = h->ps.pps->pic_init_qp_minus26;

     pp->pps_cb_qp_offset = h->ps.pps->cb_qp_offset;
     pp->pps_cr_qp_offset = h->ps.pps->cr_qp_offset;

     pp->pic_fields.bits.tiles_enabled_flag = h->ps.pps->tiles_enabled_flag;
     pp->pic_fields.bits.separate_colour_plane_flag = h->ps.sps->separate_colour_plane_flag;
     pp->pic_fields.bits.pcm_enabled_flag = h->ps.sps->pcm_enabled_flag;
     pp->pic_fields.bits.scaling_list_enabled_flag = h->ps.sps->scaling_list_enable_flag;
     pp->pic_fields.bits.transform_skip_enabled_flag = h->ps.pps->transform_skip_enabled_flag;
     pp->pic_fields.bits.amp_enabled_flag = h->ps.sps->amp_enabled_flag;
     pp->pic_fields.bits.strong_intra_smoothing_enabled_flag = h->ps.sps->sps_strong_intra_smoothing_enable_flag;
     pp->pic_fields.bits.sign_data_hiding_enabled_flag = h->ps.pps->sign_data_hiding_flag;
     pp->pic_fields.bits.constrained_intra_pred_flag = h->ps.pps->constrained_intra_pred_flag;
     pp->pic_fields.bits.cu_qp_delta_enabled_flag = h->ps.pps->cu_qp_delta_enabled_flag;
     pp->pic_fields.bits.weighted_pred_flag = h->ps.pps->weighted_pred_flag;
     pp->pic_fields.bits.weighted_bipred_flag = h->ps.pps->weighted_bipred_flag;
     pp->pic_fields.bits.transquant_bypass_enabled_flag = h->ps.pps->transquant_bypass_enable_flag;
     pp->pic_fields.bits.entropy_coding_sync_enabled_flag = h->ps.pps->entropy_coding_sync_enabled_flag;
     pp->pic_fields.bits.pps_loop_filter_across_slices_enabled_flag = h->ps.pps->seq_loop_filter_across_slices_enabled_flag;
     pp->pic_fields.bits.loop_filter_across_tiles_enabled_flag = h->ps.pps->loop_filter_across_tiles_enabled_flag;

     pp->pic_fields.bits.pcm_loop_filter_disabled_flag = h->ps.sps->pcm.loop_filter_disable_flag;
     pp->pcm_sample_bit_depth_luma_minus1 = h->ps.sps->pcm.bit_depth - 1;
     pp->pcm_sample_bit_depth_chroma_minus1 = h->ps.sps->pcm.bit_depth_chroma - 1;
     pp->log2_min_pcm_luma_coding_block_size_minus3 = h->ps.sps->pcm.log2_min_pcm_cb_size - 3;
     pp->log2_diff_max_min_pcm_luma_coding_block_size = h->ps.sps->pcm.log2_max_pcm_cb_size - h->ps.sps->pcm.log2_min_pcm_cb_size;

     memset(pp->column_width_minus1, 0, sizeof(pp->column_width_minus1));
     memset(pp->row_height_minus1, 0, sizeof(pp->row_height_minus1));

     if (h->ps.pps->tiles_enabled_flag) {
         pp->num_tile_columns_minus1 = h->ps.pps->num_tile_columns - 1;
         pp->num_tile_rows_minus1 = h->ps.pps->num_tile_rows - 1;

         for (i = 0; i < h->ps.pps->num_tile_columns; i++)
             pp->column_width_minus1[i] = h->ps.pps->column_width[i] - 1;

         for (i = 0; i < h->ps.pps->num_tile_rows; i++)
             pp->row_height_minus1[i] = h->ps.pps->row_height[i] - 1;
     }

     pp->diff_cu_qp_delta_depth = h->ps.pps->diff_cu_qp_delta_depth;
     pp->pps_beta_offset_div2 = h->ps.pps->beta_offset / 2;
     pp->pps_tc_offset_div2 = h->ps.pps->tc_offset / 2;
     pp->log2_parallel_merge_level_minus2 = h->ps.pps->log2_parallel_merge_level - 2;

     /* Different chroma/luma bit depths are currently not supported by ffmpeg. */
     pp->bit_depth_luma_minus8 = h->ps.sps->bit_depth - 8;
     pp->bit_depth_chroma_minus8 = h->ps.sps->bit_depth - 8;

     pp->slice_parsing_fields.bits.lists_modification_present_flag = h->ps.pps->lists_modification_present_flag;
     pp->slice_parsing_fields.bits.long_term_ref_pics_present_flag = h->ps.sps->long_term_ref_pics_present_flag;
     pp->slice_parsing_fields.bits.sps_temporal_mvp_enabled_flag = h->ps.sps->sps_temporal_mvp_enabled_flag;
     pp->slice_parsing_fields.bits.cabac_init_present_flag = h->ps.pps->cabac_init_present_flag;
     pp->slice_parsing_fields.bits.output_flag_present_flag = h->ps.pps->output_flag_present_flag;
     pp->slice_parsing_fields.bits.dependent_slice_segments_enabled_flag = h->ps.pps->dependent_slice_segments_enabled_flag;
     pp->slice_parsing_fields.bits.pps_slice_chroma_qp_offsets_present_flag = h->ps.pps->pic_slice_level_chroma_qp_offsets_present_flag;
     pp->slice_parsing_fields.bits.sample_adaptive_offset_enabled_flag = h->ps.sps->sao_enabled;
     pp->slice_parsing_fields.bits.deblocking_filter_override_enabled_flag = h->ps.pps->deblocking_filter_override_enabled_flag;
     pp->slice_parsing_fields.bits.pps_disable_deblocking_filter_flag = h->ps.pps->disable_dbf;
     pp->slice_parsing_fields.bits.slice_segment_header_extension_present_flag = h->ps.pps->slice_header_extension_present_flag;

     pp->log2_max_pic_order_cnt_lsb_minus4 = h->ps.sps->log2_max_poc_lsb - 4;
     pp->num_extra_slice_header_bits = h->ps.pps->num_extra_slice_header_bits;

     if (h->nal_unit_type >= NAL_BLA_W_LP && h->nal_unit_type <= NAL_CRA_NUT) {
         pp->slice_parsing_fields.bits.RapPicFlag = 1;
     } else {
         pp->slice_parsing_fields.bits.RapPicFlag = 0;
     }

     if (IS_IDR(h)) {
         pp->slice_parsing_fields.bits.IdrPicFlag = 1;
     } else {
         pp->slice_parsing_fields.bits.IdrPicFlag = 0;
     }

     if (IS_IRAP(h)) {
         pp->slice_parsing_fields.bits.IntraPicFlag = 1;
     } else {
         pp->slice_parsing_fields.bits.IntraPicFlag = 0;
     }

     if (h->sh.short_term_ref_pic_set_sps_flag == 0 && h->sh.short_term_rps) {
         pp->st_rps_bits = h->sh.short_term_ref_pic_set_size;
     } else {
         pp->st_rps_bits = 0;
     }

     /* TODO */
     pp->pic_fields.bits.NoPicReorderingFlag = 0;
     pp->pic_fields.bits.NoBiPredFlag = 0;
 }


 /** Initialize and start decoding a frame with VA API. */
 static int vaapi_hevc_start_frame(AVCodecContext          *avctx,
                                   av_unused const uint8_t *buffer,
                                   av_unused uint32_t       size)
 {
     HEVCContext * const h = avctx->priv_data;
     FFVAContext * const vactx = ff_vaapi_get_context(avctx);
     vaapi_hevc_frame_data *frame_data = h->ref->hwaccel_picture_private;
     VAPictureParameterBufferHEVC *pic_param;
     VAIQMatrixBufferHEVC *iq_matrix;
     ScalingList const * scaling_list;
     int i, j, pos;

     ff_dlog(avctx, "vaapi_hevc_start_frame()\n");

     vactx->slice_param_size = sizeof(VASliceParameterBufferHEVC);

     /* Fill in VAPictureParameterBufferHEVC. */
     pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferHEVC));
     if (!pic_param)
         return -1;
     fill_picture_parameters(h, pic_param);
     frame_data->pic_param = pic_param;

     /* Fill in VAIQMatrixBufferHEVC. */
     if (h->ps.pps->scaling_list_data_present_flag) {
         scaling_list = &h->ps.pps->scaling_list;
     } else if (h->ps.sps->scaling_list_enable_flag) {
         scaling_list = &h->ps.sps->scaling_list;
     } else {
         return 0;
     }

     iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferHEVC));
     if (!iq_matrix)
         return -1;

     for (i = 0; i < 6; ++i) {
         for (j = 0; j < 16; ++j) {
             pos = 4 * ff_hevc_diag_scan4x4_y[j] + ff_hevc_diag_scan4x4_x[j];
             iq_matrix->ScalingList4x4[i][j] = scaling_list->sl[0][i][pos];
         }
         for (j = 0; j < 64; ++j) {
             pos = 8 * ff_hevc_diag_scan8x8_y[j] + ff_hevc_diag_scan8x8_x[j];
             iq_matrix->ScalingList8x8[i][j] = scaling_list->sl[1][i][pos];
             iq_matrix->ScalingList16x16[i][j] = scaling_list->sl[2][i][pos];
             if (i < 2) {
                 iq_matrix->ScalingList32x32[i][j] = scaling_list->sl[3][i * 3][pos];
             }
         }
         iq_matrix->ScalingListDC16x16[i] = scaling_list->sl_dc[0][i];
         if (i < 2) {
             iq_matrix->ScalingListDC32x32[i] = scaling_list->sl_dc[1][i * 3];
         }
     }

     return 0;
 }

 /** End a hardware decoding based frame. */
 static int vaapi_hevc_end_frame(AVCodecContext *avctx)
 {
     FFVAContext * const vactx = ff_vaapi_get_context(avctx);
     HEVCContext * const h = avctx->priv_data;
     vaapi_hevc_frame_data *frame_data = h->ref->hwaccel_picture_private;
     int ret;

     ff_dlog(avctx, "vaapi_hevc_end_frame()\n");

     frame_data->last_slice_param->LongSliceFlags.fields.LastSliceOfPic = 1;

     ret = ff_vaapi_commit_slices(vactx);
     if (ret < 0)
         goto finish;

     ret = ff_vaapi_render_picture(vactx, ff_vaapi_get_surface_id(h->ref->frame));
     if (ret < 0)
         goto finish;

 finish:
     ff_vaapi_common_end_frame(avctx);
     return ret;
 }

 static int fill_pred_weight_table(HEVCContext * const h,
                                   VASliceParameterBufferHEVC *slice_param,
                                   SliceHeader * const sh)
 {
     int i;

     memset(slice_param->delta_luma_weight_l0, 0, sizeof(slice_param->delta_luma_weight_l0));
     memset(slice_param->delta_luma_weight_l1, 0, sizeof(slice_param->delta_luma_weight_l1));
     memset(slice_param->luma_offset_l0, 0, sizeof(slice_param->luma_offset_l0));
     memset(slice_param->luma_offset_l1, 0, sizeof(slice_param->luma_offset_l1));
     memset(slice_param->delta_chroma_weight_l0, 0, sizeof(slice_param->delta_chroma_weight_l0));
     memset(slice_param->delta_chroma_weight_l1, 0, sizeof(slice_param->delta_chroma_weight_l1));
     memset(slice_param->ChromaOffsetL0, 0, sizeof(slice_param->ChromaOffsetL0));
     memset(slice_param->ChromaOffsetL1, 0, sizeof(slice_param->ChromaOffsetL1));

     slice_param->delta_chroma_log2_weight_denom = 0;
     slice_param->luma_log2_weight_denom = 0;

     if (  sh->slice_type == I_SLICE
       || (sh->slice_type == P_SLICE && !h->ps.pps->weighted_pred_flag)
       || (sh->slice_type == B_SLICE && !h->ps.pps->weighted_bipred_flag)) {
         return 0;
     }

     slice_param->luma_log2_weight_denom = sh->luma_log2_weight_denom;

     if (h->ps.sps->chroma_format_idc) {
         slice_param->delta_chroma_log2_weight_denom = sh->chroma_log2_weight_denom - sh->luma_log2_weight_denom;
     }

     for (i = 0; i < 15 && i < sh->nb_refs[L0]; ++i) {
         slice_param->delta_luma_weight_l0[i] = sh->luma_weight_l0[i] - (1 << sh->luma_log2_weight_denom);
         slice_param->luma_offset_l0[i] = sh->luma_offset_l0[i];
         slice_param->delta_chroma_weight_l0[i][0] = sh->chroma_weight_l0[i][0] - (1 << sh->chroma_log2_weight_denom);
         slice_param->delta_chroma_weight_l0[i][1] = sh->chroma_weight_l0[i][1] - (1 << sh->chroma_log2_weight_denom);
         slice_param->ChromaOffsetL0[i][0] = sh->chroma_offset_l0[i][0];
         slice_param->ChromaOffsetL0[i][1] = sh->chroma_offset_l0[i][1];
     }

     if (sh->slice_type == B_SLICE) {
         for (i = 0; i < 15 && i < sh->nb_refs[L1]; ++i) {
             slice_param->delta_luma_weight_l1[i] = sh->luma_weight_l1[i] - (1 << sh->luma_log2_weight_denom);
             slice_param->luma_offset_l1[i] = sh->luma_offset_l1[i];
             slice_param->delta_chroma_weight_l1[i][0] = sh->chroma_weight_l1[i][0] - (1 << sh->chroma_log2_weight_denom);
             slice_param->delta_chroma_weight_l1[i][1] = sh->chroma_weight_l1[i][1] - (1 << sh->chroma_log2_weight_denom);
             slice_param->ChromaOffsetL1[i][0] = sh->chroma_offset_l1[i][0];
             slice_param->ChromaOffsetL1[i][1] = sh->chroma_offset_l1[i][1];
         }
     }

     return 0;
 }

 /** Decode the given hevc slice with VA API. */
 static int vaapi_hevc_decode_slice(AVCodecContext *avctx,
                                    const uint8_t  *buffer,
                                    uint32_t        size)
 {
     FFVAContext * const vactx = ff_vaapi_get_context(avctx);
     HEVCContext * const h = avctx->priv_data;
     vaapi_hevc_frame_data *frame_data = h->ref->hwaccel_picture_private;
     SliceHeader * const sh = &h->sh;
     VASliceParameterBufferHEVC *slice_param;
     int i, list_idx;
     uint8_t nb_list = sh->slice_type == B_SLICE ? 2 : 1;

     if (sh->slice_type == I_SLICE)
         nb_list = 0;

     ff_dlog(avctx, "vaapi_hevc_decode_slice(): buffer %p, size %d\n", buffer, size);

     /* Fill in VASliceParameterBufferH264. */
     slice_param = (VASliceParameterBufferHEVC *)ff_vaapi_alloc_slice(vactx, buffer, size);
     if (!slice_param)
         return -1;

     frame_data->last_slice_param = slice_param;

     /* The base structure changed, so this has to be re-set in order to be valid on every byte order. */
     slice_param->slice_data_flag = VA_SLICE_DATA_FLAG_ALL;

     /* Add 1 to the bits count here to account for the byte_alignment bit, which allways is at least one bit and not accounted for otherwise. */
     slice_param->slice_data_byte_offset = (get_bits_count(&h->HEVClc->gb) + 1 + 7) / 8;

     slice_param->slice_segment_address = sh->slice_segment_addr;

     slice_param->LongSliceFlags.value = 0;
     slice_param->LongSliceFlags.fields.dependent_slice_segment_flag = sh->dependent_slice_segment_flag;
     slice_param->LongSliceFlags.fields.slice_type = sh->slice_type;
     slice_param->LongSliceFlags.fields.color_plane_id = sh->colour_plane_id;
     slice_param->LongSliceFlags.fields.mvd_l1_zero_flag = sh->mvd_l1_zero_flag;
     slice_param->LongSliceFlags.fields.cabac_init_flag = sh->cabac_init_flag;
     slice_param->LongSliceFlags.fields.slice_temporal_mvp_enabled_flag = sh->slice_temporal_mvp_enabled_flag;
     slice_param->LongSliceFlags.fields.slice_deblocking_filter_disabled_flag = sh->disable_deblocking_filter_flag;
     slice_param->LongSliceFlags.fields.collocated_from_l0_flag = sh->collocated_list == L0 ? 1 : 0;
     slice_param->LongSliceFlags.fields.slice_loop_filter_across_slices_enabled_flag = sh->slice_loop_filter_across_slices_enabled_flag;

     slice_param->LongSliceFlags.fields.slice_sao_luma_flag = sh->slice_sample_adaptive_offset_flag[0];
     if (h->ps.sps->chroma_format_idc) {
         slice_param->LongSliceFlags.fields.slice_sao_chroma_flag = sh->slice_sample_adaptive_offset_flag[1];
     }

     if (sh->slice_temporal_mvp_enabled_flag) {
         slice_param->collocated_ref_idx = sh->collocated_ref_idx;
     } else {
         slice_param->collocated_ref_idx = 0xFF;
     }

     slice_param->slice_qp_delta = sh->slice_qp_delta;
     slice_param->slice_cb_qp_offset = sh->slice_cb_qp_offset;
     slice_param->slice_cr_qp_offset = sh->slice_cr_qp_offset;
     slice_param->slice_beta_offset_div2 = sh->beta_offset / 2;
     slice_param->slice_tc_offset_div2 = sh->tc_offset / 2;

     if (sh->slice_type == I_SLICE) {
         slice_param->five_minus_max_num_merge_cand = 0;
     } else {
         slice_param->five_minus_max_num_merge_cand = 5 - sh->max_num_merge_cand;
     }

     slice_param->num_ref_idx_l0_active_minus1 = sh->nb_refs[L0] ? sh->nb_refs[L0] - 1 : 0;
     slice_param->num_ref_idx_l1_active_minus1 = sh->nb_refs[L1] ? sh->nb_refs[L1] - 1 : 0;

     memset(slice_param->RefPicList, 0xFF, sizeof(slice_param->RefPicList));

     /* h->ref->refPicList is updated befor calling each slice */
     for (list_idx = 0; list_idx < nb_list; ++list_idx) {
         RefPicList *rpl = &h->ref->refPicList[list_idx];

         for (i = 0; i < rpl->nb_refs; ++i) {
             slice_param->RefPicList[list_idx][i] = get_ref_pic_index(h, rpl->ref[i]);
         }
     }

     return fill_pred_weight_table(h, slice_param, sh);
 }

 AVHWAccel ff_hevc_vaapi_hwaccel = {
     .name                 = "hevc_vaapi",
     .type                 = AVMEDIA_TYPE_VIDEO,
     .id                   = AV_CODEC_ID_HEVC,
     .pix_fmt              = AV_PIX_FMT_VAAPI,
     .start_frame          = vaapi_hevc_start_frame,
     .end_frame            = vaapi_hevc_end_frame,
     .decode_slice         = vaapi_hevc_decode_slice,
     .init                 = ff_vaapi_context_init,
     .uninit               = ff_vaapi_context_fini,
     .priv_data_size       = sizeof(FFVAContext),
     .frame_priv_data_size = sizeof(vaapi_hevc_frame_data),
 };
	/*
	* HEVC HW decode acceleration through VA API
	*
	* Copyright (C) 2015 Timo Rothenpieler <timo@rothenpieler.org>
	*
	* This file is part of FFmpeg.
	*
	* FFmpeg is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2.1 of the License, or (at your option) any later version.
	*
	* FFmpeg is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with FFmpeg; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include "vaapi_internal.h"
	#include "hevc.h"
	#include "mpegutils.h"

	/**
	* @file
	* This file implements the glue code between FFmpeg's and VA API's
	* structures for HEVC decoding.
	*/

	typedef struct vaapi_hevc_frame_data {
	VAPictureParameterBufferHEVC *pic_param;
	VASliceParameterBufferHEVC *last_slice_param;
	} vaapi_hevc_frame_data;

	/**
	* Initialize an empty VA API picture.
	*
	* VA API requires a fixed-size reference picture array.
	*/
	static void init_vaapi_pic(VAPictureHEVC *va_pic)
	{
	va_pic->picture_id = VA_INVALID_ID;
	va_pic->flags = VA_PICTURE_HEVC_INVALID;
	va_pic->pic_order_cnt = 0;
	}

	static void fill_vaapi_pic(VAPictureHEVC va_pic, const HEVCFrame pic, int rps_type)
	{
	va_pic->picture_id = ff_vaapi_get_surface_id(pic->frame);
	va_pic->pic_order_cnt = pic->poc;
	va_pic->flags = rps_type;

	if (pic->flags & HEVC_FRAME_FLAG_LONG_REF)
	va_pic->flags \|= VA_PICTURE_HEVC_LONG_TERM_REFERENCE;

	if (pic->frame->interlaced_frame) {
	va_pic->flags \|= VA_PICTURE_HEVC_FIELD_PIC;

	if (!pic->frame->top_field_first) {
	va_pic->flags \|= VA_PICTURE_HEVC_BOTTOM_FIELD;
	}
	}
	}

	static int find_frame_rps_type(const HEVCContext h, const HEVCFrame pic)
	{
	VASurfaceID pic_surf = ff_vaapi_get_surface_id(pic->frame);
	int i;

	for (i = 0; i < h->rps[ST_CURR_BEF].nb_refs; ++i) {
	if (pic_surf == ff_vaapi_get_surface_id(h->rps[ST_CURR_BEF].ref[i]->frame))
	return VA_PICTURE_HEVC_RPS_ST_CURR_BEFORE;
	}

	for (i = 0; i < h->rps[ST_CURR_AFT].nb_refs; ++i) {
	if (pic_surf == ff_vaapi_get_surface_id(h->rps[ST_CURR_AFT].ref[i]->frame))
	return VA_PICTURE_HEVC_RPS_ST_CURR_AFTER;
	}

	for (i = 0; i < h->rps[LT_CURR].nb_refs; ++i) {
	if (pic_surf == ff_vaapi_get_surface_id(h->rps[LT_CURR].ref[i]->frame))
	return VA_PICTURE_HEVC_RPS_LT_CURR;
	}

	return 0;
	}

	static void fill_vaapi_ReferenceFrames(const HEVCContext h, VAPictureParameterBufferHEVC pp)
	{
	const HEVCFrame *current_picture = h->ref;
	int i, j, rps_type;

	for (i = 0, j = 0; i < FF_ARRAY_ELEMS(pp->ReferenceFrames); i++) {
	const HEVCFrame *frame = NULL;

	while (!frame && j < FF_ARRAY_ELEMS(h->DPB)) {
	if (&h->DPB[j] != current_picture && (h->DPB[j].flags & (HEVC_FRAME_FLAG_LONG_REF \| HEVC_FRAME_FLAG_SHORT_REF)))
	frame = &h->DPB[j];
	j++;
	}

	init_vaapi_pic(&pp->ReferenceFrames[i]);

	if (frame) {
	rps_type = find_frame_rps_type(h, frame);
	fill_vaapi_pic(&pp->ReferenceFrames[i], frame, rps_type);
	}
	}
	}

	static uint8_t get_ref_pic_index(const HEVCContext h, const HEVCFrame frame)
	{
	vaapi_hevc_frame_data *frame_data = h->ref->hwaccel_picture_private;
	VAPictureParameterBufferHEVC *pp = frame_data->pic_param;
	uint8_t i;

	if (!frame)
	return 0xff;

	for (i = 0; i < FF_ARRAY_ELEMS(pp->ReferenceFrames); ++i) {
	VASurfaceID pid = pp->ReferenceFrames[i].picture_id;
	int poc = pp->ReferenceFrames[i].pic_order_cnt;
	if (pid != VA_INVALID_ID && pid == ff_vaapi_get_surface_id(frame->frame) && poc == frame->poc)
	return i;
	}

	return 0xff;
	}

	static void fill_picture_parameters(const HEVCContext h, VAPictureParameterBufferHEVC pp)
	{
	int i;

	pp->pic_fields.value = 0;
	pp->slice_parsing_fields.value = 0;

	fill_vaapi_pic(&pp->CurrPic, h->ref, 0);
	fill_vaapi_ReferenceFrames(h, pp);

	pp->pic_width_in_luma_samples = h->ps.sps->width;
	pp->pic_height_in_luma_samples = h->ps.sps->height;

	pp->log2_min_luma_coding_block_size_minus3 = h->ps.sps->log2_min_cb_size - 3;

	pp->pic_fields.bits.chroma_format_idc = h->ps.sps->chroma_format_idc;

	pp->sps_max_dec_pic_buffering_minus1 = h->ps.sps->temporal_layer[h->ps.sps->max_sub_layers - 1].max_dec_pic_buffering - 1;
	pp->log2_diff_max_min_luma_coding_block_size = h->ps.sps->log2_diff_max_min_coding_block_size;
	pp->log2_min_transform_block_size_minus2 = h->ps.sps->log2_min_tb_size - 2;
	pp->log2_diff_max_min_transform_block_size = h->ps.sps->log2_max_trafo_size - h->ps.sps->log2_min_tb_size;
	pp->max_transform_hierarchy_depth_inter = h->ps.sps->max_transform_hierarchy_depth_inter;
	pp->max_transform_hierarchy_depth_intra = h->ps.sps->max_transform_hierarchy_depth_intra;
	pp->num_short_term_ref_pic_sets = h->ps.sps->nb_st_rps;
	pp->num_long_term_ref_pic_sps = h->ps.sps->num_long_term_ref_pics_sps;

	pp->num_ref_idx_l0_default_active_minus1 = h->ps.pps->num_ref_idx_l0_default_active - 1;
	pp->num_ref_idx_l1_default_active_minus1 = h->ps.pps->num_ref_idx_l1_default_active - 1;
	pp->init_qp_minus26 = h->ps.pps->pic_init_qp_minus26;

	pp->pps_cb_qp_offset = h->ps.pps->cb_qp_offset;
	pp->pps_cr_qp_offset = h->ps.pps->cr_qp_offset;

	pp->pic_fields.bits.tiles_enabled_flag = h->ps.pps->tiles_enabled_flag;
	pp->pic_fields.bits.separate_colour_plane_flag = h->ps.sps->separate_colour_plane_flag;
	pp->pic_fields.bits.pcm_enabled_flag = h->ps.sps->pcm_enabled_flag;
	pp->pic_fields.bits.scaling_list_enabled_flag = h->ps.sps->scaling_list_enable_flag;
	pp->pic_fields.bits.transform_skip_enabled_flag = h->ps.pps->transform_skip_enabled_flag;
	pp->pic_fields.bits.amp_enabled_flag = h->ps.sps->amp_enabled_flag;
	pp->pic_fields.bits.strong_intra_smoothing_enabled_flag = h->ps.sps->sps_strong_intra_smoothing_enable_flag;
	pp->pic_fields.bits.sign_data_hiding_enabled_flag = h->ps.pps->sign_data_hiding_flag;
	pp->pic_fields.bits.constrained_intra_pred_flag = h->ps.pps->constrained_intra_pred_flag;
	pp->pic_fields.bits.cu_qp_delta_enabled_flag = h->ps.pps->cu_qp_delta_enabled_flag;
	pp->pic_fields.bits.weighted_pred_flag = h->ps.pps->weighted_pred_flag;
	pp->pic_fields.bits.weighted_bipred_flag = h->ps.pps->weighted_bipred_flag;
	pp->pic_fields.bits.transquant_bypass_enabled_flag = h->ps.pps->transquant_bypass_enable_flag;
	pp->pic_fields.bits.entropy_coding_sync_enabled_flag = h->ps.pps->entropy_coding_sync_enabled_flag;
	pp->pic_fields.bits.pps_loop_filter_across_slices_enabled_flag = h->ps.pps->seq_loop_filter_across_slices_enabled_flag;
	pp->pic_fields.bits.loop_filter_across_tiles_enabled_flag = h->ps.pps->loop_filter_across_tiles_enabled_flag;

	pp->pic_fields.bits.pcm_loop_filter_disabled_flag = h->ps.sps->pcm.loop_filter_disable_flag;
	pp->pcm_sample_bit_depth_luma_minus1 = h->ps.sps->pcm.bit_depth - 1;
	pp->pcm_sample_bit_depth_chroma_minus1 = h->ps.sps->pcm.bit_depth_chroma - 1;
	pp->log2_min_pcm_luma_coding_block_size_minus3 = h->ps.sps->pcm.log2_min_pcm_cb_size - 3;
	pp->log2_diff_max_min_pcm_luma_coding_block_size = h->ps.sps->pcm.log2_max_pcm_cb_size - h->ps.sps->pcm.log2_min_pcm_cb_size;

	memset(pp->column_width_minus1, 0, sizeof(pp->column_width_minus1));
	memset(pp->row_height_minus1, 0, sizeof(pp->row_height_minus1));

	if (h->ps.pps->tiles_enabled_flag) {
	pp->num_tile_columns_minus1 = h->ps.pps->num_tile_columns - 1;
	pp->num_tile_rows_minus1 = h->ps.pps->num_tile_rows - 1;

	for (i = 0; i < h->ps.pps->num_tile_columns; i++)
	pp->column_width_minus1[i] = h->ps.pps->column_width[i] - 1;

	for (i = 0; i < h->ps.pps->num_tile_rows; i++)
	pp->row_height_minus1[i] = h->ps.pps->row_height[i] - 1;
	}

	pp->diff_cu_qp_delta_depth = h->ps.pps->diff_cu_qp_delta_depth;
	pp->pps_beta_offset_div2 = h->ps.pps->beta_offset / 2;
	pp->pps_tc_offset_div2 = h->ps.pps->tc_offset / 2;
	pp->log2_parallel_merge_level_minus2 = h->ps.pps->log2_parallel_merge_level - 2;

	/* Different chroma/luma bit depths are currently not supported by ffmpeg. */
	pp->bit_depth_luma_minus8 = h->ps.sps->bit_depth - 8;
	pp->bit_depth_chroma_minus8 = h->ps.sps->bit_depth - 8;

	pp->slice_parsing_fields.bits.lists_modification_present_flag = h->ps.pps->lists_modification_present_flag;
	pp->slice_parsing_fields.bits.long_term_ref_pics_present_flag = h->ps.sps->long_term_ref_pics_present_flag;
	pp->slice_parsing_fields.bits.sps_temporal_mvp_enabled_flag = h->ps.sps->sps_temporal_mvp_enabled_flag;
	pp->slice_parsing_fields.bits.cabac_init_present_flag = h->ps.pps->cabac_init_present_flag;
	pp->slice_parsing_fields.bits.output_flag_present_flag = h->ps.pps->output_flag_present_flag;
	pp->slice_parsing_fields.bits.dependent_slice_segments_enabled_flag = h->ps.pps->dependent_slice_segments_enabled_flag;
	pp->slice_parsing_fields.bits.pps_slice_chroma_qp_offsets_present_flag = h->ps.pps->pic_slice_level_chroma_qp_offsets_present_flag;
	pp->slice_parsing_fields.bits.sample_adaptive_offset_enabled_flag = h->ps.sps->sao_enabled;
	pp->slice_parsing_fields.bits.deblocking_filter_override_enabled_flag = h->ps.pps->deblocking_filter_override_enabled_flag;
	pp->slice_parsing_fields.bits.pps_disable_deblocking_filter_flag = h->ps.pps->disable_dbf;
	pp->slice_parsing_fields.bits.slice_segment_header_extension_present_flag = h->ps.pps->slice_header_extension_present_flag;

	pp->log2_max_pic_order_cnt_lsb_minus4 = h->ps.sps->log2_max_poc_lsb - 4;
	pp->num_extra_slice_header_bits = h->ps.pps->num_extra_slice_header_bits;

	if (h->nal_unit_type >= NAL_BLA_W_LP && h->nal_unit_type <= NAL_CRA_NUT) {
	pp->slice_parsing_fields.bits.RapPicFlag = 1;
	} else {
	pp->slice_parsing_fields.bits.RapPicFlag = 0;
	}

	if (IS_IDR(h)) {
	pp->slice_parsing_fields.bits.IdrPicFlag = 1;
	} else {
	pp->slice_parsing_fields.bits.IdrPicFlag = 0;
	}

	if (IS_IRAP(h)) {
	pp->slice_parsing_fields.bits.IntraPicFlag = 1;
	} else {
	pp->slice_parsing_fields.bits.IntraPicFlag = 0;
	}

	if (h->sh.short_term_ref_pic_set_sps_flag == 0 && h->sh.short_term_rps) {
	pp->st_rps_bits = h->sh.short_term_ref_pic_set_size;
	} else {
	pp->st_rps_bits = 0;
	}

	/* TODO */
	pp->pic_fields.bits.NoPicReorderingFlag = 0;
	pp->pic_fields.bits.NoBiPredFlag = 0;
	}


	/** Initialize and start decoding a frame with VA API. */
	static int vaapi_hevc_start_frame(AVCodecContext *avctx,
	av_unused const uint8_t *buffer,
	av_unused uint32_t size)
	{
	HEVCContext * const h = avctx->priv_data;
	FFVAContext * const vactx = ff_vaapi_get_context(avctx);
	vaapi_hevc_frame_data *frame_data = h->ref->hwaccel_picture_private;
	VAPictureParameterBufferHEVC *pic_param;
	VAIQMatrixBufferHEVC *iq_matrix;
	ScalingList const * scaling_list;
	int i, j, pos;

	ff_dlog(avctx, "vaapi_hevc_start_frame()\n");

	vactx->slice_param_size = sizeof(VASliceParameterBufferHEVC);

	/* Fill in VAPictureParameterBufferHEVC. */
	pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferHEVC));
	if (!pic_param)
	return -1;
	fill_picture_parameters(h, pic_param);
	frame_data->pic_param = pic_param;

	/* Fill in VAIQMatrixBufferHEVC. */
	if (h->ps.pps->scaling_list_data_present_flag) {
	scaling_list = &h->ps.pps->scaling_list;
	} else if (h->ps.sps->scaling_list_enable_flag) {
	scaling_list = &h->ps.sps->scaling_list;
	} else {
	return 0;
	}

	iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferHEVC));
	if (!iq_matrix)
	return -1;

	for (i = 0; i < 6; ++i) {
	for (j = 0; j < 16; ++j) {
	pos = 4 * ff_hevc_diag_scan4x4_y[j] + ff_hevc_diag_scan4x4_x[j];
	iq_matrix->ScalingList4x4[i][j] = scaling_list->sl[0][i][pos];
	}
	for (j = 0; j < 64; ++j) {
	pos = 8 * ff_hevc_diag_scan8x8_y[j] + ff_hevc_diag_scan8x8_x[j];
	iq_matrix->ScalingList8x8[i][j] = scaling_list->sl[1][i][pos];
	iq_matrix->ScalingList16x16[i][j] = scaling_list->sl[2][i][pos];
	if (i < 2) {
	iq_matrix->ScalingList32x32[i][j] = scaling_list->sl[3][i * 3][pos];
	}
	}
	iq_matrix->ScalingListDC16x16[i] = scaling_list->sl_dc[0][i];
	if (i < 2) {
	iq_matrix->ScalingListDC32x32[i] = scaling_list->sl_dc[1][i * 3];
	}
	}

	return 0;
	}

	/** End a hardware decoding based frame. */
	static int vaapi_hevc_end_frame(AVCodecContext *avctx)
	{
	FFVAContext * const vactx = ff_vaapi_get_context(avctx);
	HEVCContext * const h = avctx->priv_data;
	vaapi_hevc_frame_data *frame_data = h->ref->hwaccel_picture_private;
	int ret;

	ff_dlog(avctx, "vaapi_hevc_end_frame()\n");

	frame_data->last_slice_param->LongSliceFlags.fields.LastSliceOfPic = 1;

	ret = ff_vaapi_commit_slices(vactx);
	if (ret < 0)
	goto finish;

	ret = ff_vaapi_render_picture(vactx, ff_vaapi_get_surface_id(h->ref->frame));
	if (ret < 0)
	goto finish;

	finish:
	ff_vaapi_common_end_frame(avctx);
	return ret;
	}

	static int fill_pred_weight_table(HEVCContext * const h,
	VASliceParameterBufferHEVC *slice_param,
	SliceHeader * const sh)
	{
	int i;

	memset(slice_param->delta_luma_weight_l0, 0, sizeof(slice_param->delta_luma_weight_l0));
	memset(slice_param->delta_luma_weight_l1, 0, sizeof(slice_param->delta_luma_weight_l1));
	memset(slice_param->luma_offset_l0, 0, sizeof(slice_param->luma_offset_l0));
	memset(slice_param->luma_offset_l1, 0, sizeof(slice_param->luma_offset_l1));
	memset(slice_param->delta_chroma_weight_l0, 0, sizeof(slice_param->delta_chroma_weight_l0));
	memset(slice_param->delta_chroma_weight_l1, 0, sizeof(slice_param->delta_chroma_weight_l1));
	memset(slice_param->ChromaOffsetL0, 0, sizeof(slice_param->ChromaOffsetL0));
	memset(slice_param->ChromaOffsetL1, 0, sizeof(slice_param->ChromaOffsetL1));

	slice_param->delta_chroma_log2_weight_denom = 0;
	slice_param->luma_log2_weight_denom = 0;

	if ( sh->slice_type == I_SLICE
	\|\| (sh->slice_type == P_SLICE && !h->ps.pps->weighted_pred_flag)
	\|\| (sh->slice_type == B_SLICE && !h->ps.pps->weighted_bipred_flag)) {
	return 0;
	}

	slice_param->luma_log2_weight_denom = sh->luma_log2_weight_denom;

	if (h->ps.sps->chroma_format_idc) {
	slice_param->delta_chroma_log2_weight_denom = sh->chroma_log2_weight_denom - sh->luma_log2_weight_denom;
	}

	for (i = 0; i < 15 && i < sh->nb_refs[L0]; ++i) {
	slice_param->delta_luma_weight_l0[i] = sh->luma_weight_l0[i] - (1 << sh->luma_log2_weight_denom);
	slice_param->luma_offset_l0[i] = sh->luma_offset_l0[i];
	slice_param->delta_chroma_weight_l0[i][0] = sh->chroma_weight_l0[i][0] - (1 << sh->chroma_log2_weight_denom);
	slice_param->delta_chroma_weight_l0[i][1] = sh->chroma_weight_l0[i][1] - (1 << sh->chroma_log2_weight_denom);
	slice_param->ChromaOffsetL0[i][0] = sh->chroma_offset_l0[i][0];
	slice_param->ChromaOffsetL0[i][1] = sh->chroma_offset_l0[i][1];
	}

	if (sh->slice_type == B_SLICE) {
	for (i = 0; i < 15 && i < sh->nb_refs[L1]; ++i) {
	slice_param->delta_luma_weight_l1[i] = sh->luma_weight_l1[i] - (1 << sh->luma_log2_weight_denom);
	slice_param->luma_offset_l1[i] = sh->luma_offset_l1[i];
	slice_param->delta_chroma_weight_l1[i][0] = sh->chroma_weight_l1[i][0] - (1 << sh->chroma_log2_weight_denom);
	slice_param->delta_chroma_weight_l1[i][1] = sh->chroma_weight_l1[i][1] - (1 << sh->chroma_log2_weight_denom);
	slice_param->ChromaOffsetL1[i][0] = sh->chroma_offset_l1[i][0];
	slice_param->ChromaOffsetL1[i][1] = sh->chroma_offset_l1[i][1];
	}
	}

	return 0;
	}

	/** Decode the given hevc slice with VA API. */
	static int vaapi_hevc_decode_slice(AVCodecContext *avctx,
	const uint8_t *buffer,
	uint32_t size)
	{
	FFVAContext * const vactx = ff_vaapi_get_context(avctx);
	HEVCContext * const h = avctx->priv_data;
	vaapi_hevc_frame_data *frame_data = h->ref->hwaccel_picture_private;
	SliceHeader * const sh = &h->sh;
	VASliceParameterBufferHEVC *slice_param;
	int i, list_idx;
	uint8_t nb_list = sh->slice_type == B_SLICE ? 2 : 1;

	if (sh->slice_type == I_SLICE)
	nb_list = 0;

	ff_dlog(avctx, "vaapi_hevc_decode_slice(): buffer %p, size %d\n", buffer, size);

	/* Fill in VASliceParameterBufferH264. */
	slice_param = (VASliceParameterBufferHEVC *)ff_vaapi_alloc_slice(vactx, buffer, size);
	if (!slice_param)
	return -1;

	frame_data->last_slice_param = slice_param;

	/* The base structure changed, so this has to be re-set in order to be valid on every byte order. */
	slice_param->slice_data_flag = VA_SLICE_DATA_FLAG_ALL;

	/* Add 1 to the bits count here to account for the byte_alignment bit, which allways is at least one bit and not accounted for otherwise. */
	slice_param->slice_data_byte_offset = (get_bits_count(&h->HEVClc->gb) + 1 + 7) / 8;

	slice_param->slice_segment_address = sh->slice_segment_addr;

	slice_param->LongSliceFlags.value = 0;
	slice_param->LongSliceFlags.fields.dependent_slice_segment_flag = sh->dependent_slice_segment_flag;
	slice_param->LongSliceFlags.fields.slice_type = sh->slice_type;
	slice_param->LongSliceFlags.fields.color_plane_id = sh->colour_plane_id;
	slice_param->LongSliceFlags.fields.mvd_l1_zero_flag = sh->mvd_l1_zero_flag;
	slice_param->LongSliceFlags.fields.cabac_init_flag = sh->cabac_init_flag;
	slice_param->LongSliceFlags.fields.slice_temporal_mvp_enabled_flag = sh->slice_temporal_mvp_enabled_flag;
	slice_param->LongSliceFlags.fields.slice_deblocking_filter_disabled_flag = sh->disable_deblocking_filter_flag;
	slice_param->LongSliceFlags.fields.collocated_from_l0_flag = sh->collocated_list == L0 ? 1 : 0;
	slice_param->LongSliceFlags.fields.slice_loop_filter_across_slices_enabled_flag = sh->slice_loop_filter_across_slices_enabled_flag;

	slice_param->LongSliceFlags.fields.slice_sao_luma_flag = sh->slice_sample_adaptive_offset_flag[0];
	if (h->ps.sps->chroma_format_idc) {
	slice_param->LongSliceFlags.fields.slice_sao_chroma_flag = sh->slice_sample_adaptive_offset_flag[1];
	}

	if (sh->slice_temporal_mvp_enabled_flag) {
	slice_param->collocated_ref_idx = sh->collocated_ref_idx;
	} else {
	slice_param->collocated_ref_idx = 0xFF;
	}

	slice_param->slice_qp_delta = sh->slice_qp_delta;
	slice_param->slice_cb_qp_offset = sh->slice_cb_qp_offset;
	slice_param->slice_cr_qp_offset = sh->slice_cr_qp_offset;
	slice_param->slice_beta_offset_div2 = sh->beta_offset / 2;
	slice_param->slice_tc_offset_div2 = sh->tc_offset / 2;

	if (sh->slice_type == I_SLICE) {
	slice_param->five_minus_max_num_merge_cand = 0;
	} else {
	slice_param->five_minus_max_num_merge_cand = 5 - sh->max_num_merge_cand;
	}

	slice_param->num_ref_idx_l0_active_minus1 = sh->nb_refs[L0] ? sh->nb_refs[L0] - 1 : 0;
	slice_param->num_ref_idx_l1_active_minus1 = sh->nb_refs[L1] ? sh->nb_refs[L1] - 1 : 0;

	memset(slice_param->RefPicList, 0xFF, sizeof(slice_param->RefPicList));

	/* h->ref->refPicList is updated befor calling each slice */
	for (list_idx = 0; list_idx < nb_list; ++list_idx) {
	RefPicList *rpl = &h->ref->refPicList[list_idx];

	for (i = 0; i < rpl->nb_refs; ++i) {
	slice_param->RefPicList[list_idx][i] = get_ref_pic_index(h, rpl->ref[i]);
	}
	}

	return fill_pred_weight_table(h, slice_param, sh);
	}

	AVHWAccel ff_hevc_vaapi_hwaccel = {
	.name = "hevc_vaapi",
	.type = AVMEDIA_TYPE_VIDEO,
	.id = AV_CODEC_ID_HEVC,
	.pix_fmt = AV_PIX_FMT_VAAPI,
	.start_frame = vaapi_hevc_start_frame,
	.end_frame = vaapi_hevc_end_frame,
	.decode_slice = vaapi_hevc_decode_slice,
	.init = ff_vaapi_context_init,
	.uninit = ff_vaapi_context_fini,
	.priv_data_size = sizeof(FFVAContext),
	.frame_priv_data_size = sizeof(vaapi_hevc_frame_data),
	};