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  1. /*
  2.  * HEVC HW decode acceleration through VA API
  3.  *
  4.  * Copyright (C) 2015 Timo Rothenpieler <timo@rothenpieler.org>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #include "vaapi_internal.h"
  24. #include "hevc.h"
  25. #include "mpegutils.h"
  26.  
  27. /**
  28.  * @file
  29.  * This file implements the glue code between FFmpeg's and VA API's
  30.  * structures for HEVC decoding.
  31.  */
  32.  
  33. typedef struct vaapi_hevc_frame_data {
  34.     VAPictureParameterBufferHEVC *pic_param;
  35.     VASliceParameterBufferHEVC *last_slice_param;
  36. } vaapi_hevc_frame_data;
  37.  
  38. /**
  39.  * Initialize an empty VA API picture.
  40.  *
  41.  * VA API requires a fixed-size reference picture array.
  42.  */
  43. static void init_vaapi_pic(VAPictureHEVC *va_pic)
  44. {
  45.     va_pic->picture_id = VA_INVALID_ID;
  46.     va_pic->flags = VA_PICTURE_HEVC_INVALID;
  47.     va_pic->pic_order_cnt = 0;
  48. }
  49.  
  50. static void fill_vaapi_pic(VAPictureHEVC *va_pic, const HEVCFrame *pic, int rps_type)
  51. {
  52.     va_pic->picture_id = ff_vaapi_get_surface_id(pic->frame);
  53.     va_pic->pic_order_cnt = pic->poc;
  54.     va_pic->flags = rps_type;
  55.  
  56.     if (pic->flags & HEVC_FRAME_FLAG_LONG_REF)
  57.         va_pic->flags |= VA_PICTURE_HEVC_LONG_TERM_REFERENCE;
  58.  
  59.     if (pic->frame->interlaced_frame) {
  60.         va_pic->flags |= VA_PICTURE_HEVC_FIELD_PIC;
  61.  
  62.         if (!pic->frame->top_field_first) {
  63.             va_pic->flags |= VA_PICTURE_HEVC_BOTTOM_FIELD;
  64.         }
  65.     }
  66. }
  67.  
  68. static int find_frame_rps_type(const HEVCContext *h, const HEVCFrame *pic)
  69. {
  70.     VASurfaceID pic_surf = ff_vaapi_get_surface_id(pic->frame);
  71.     int i;
  72.  
  73.     for (i = 0; i < h->rps[ST_CURR_BEF].nb_refs; ++i) {
  74.         if (pic_surf == ff_vaapi_get_surface_id(h->rps[ST_CURR_BEF].ref[i]->frame))
  75.             return VA_PICTURE_HEVC_RPS_ST_CURR_BEFORE;
  76.     }
  77.  
  78.     for (i = 0; i < h->rps[ST_CURR_AFT].nb_refs; ++i) {
  79.         if (pic_surf == ff_vaapi_get_surface_id(h->rps[ST_CURR_AFT].ref[i]->frame))
  80.             return VA_PICTURE_HEVC_RPS_ST_CURR_AFTER;
  81.     }
  82.  
  83.     for (i = 0; i < h->rps[LT_CURR].nb_refs; ++i) {
  84.         if (pic_surf == ff_vaapi_get_surface_id(h->rps[LT_CURR].ref[i]->frame))
  85.             return VA_PICTURE_HEVC_RPS_LT_CURR;
  86.     }
  87.  
  88.     return 0;
  89. }
  90.  
  91. static void fill_vaapi_ReferenceFrames(const HEVCContext *h, VAPictureParameterBufferHEVC *pp)
  92. {
  93.     const HEVCFrame *current_picture = h->ref;
  94.     int i, j, rps_type;
  95.  
  96.     for (i = 0, j = 0; i < FF_ARRAY_ELEMS(pp->ReferenceFrames); i++) {
  97.         const HEVCFrame *frame = NULL;
  98.  
  99.         while (!frame && j < FF_ARRAY_ELEMS(h->DPB)) {
  100.             if (&h->DPB[j] != current_picture && (h->DPB[j].flags & (HEVC_FRAME_FLAG_LONG_REF | HEVC_FRAME_FLAG_SHORT_REF)))
  101.                 frame = &h->DPB[j];
  102.             j++;
  103.         }
  104.  
  105.         init_vaapi_pic(&pp->ReferenceFrames[i]);
  106.  
  107.         if (frame) {
  108.             rps_type = find_frame_rps_type(h, frame);
  109.             fill_vaapi_pic(&pp->ReferenceFrames[i], frame, rps_type);
  110.         }
  111.     }
  112. }
  113.  
  114. static uint8_t get_ref_pic_index(const HEVCContext *h, const HEVCFrame *frame)
  115. {
  116.     vaapi_hevc_frame_data *frame_data = h->ref->hwaccel_picture_private;
  117.     VAPictureParameterBufferHEVC *pp = frame_data->pic_param;
  118.     uint8_t i;
  119.  
  120.     if (!frame)
  121.         return 0xff;
  122.  
  123.     for (i = 0; i < FF_ARRAY_ELEMS(pp->ReferenceFrames); ++i) {
  124.         VASurfaceID pid = pp->ReferenceFrames[i].picture_id;
  125.         int poc = pp->ReferenceFrames[i].pic_order_cnt;
  126.         if (pid != VA_INVALID_ID && pid == ff_vaapi_get_surface_id(frame->frame) && poc == frame->poc)
  127.             return i;
  128.     }
  129.  
  130.     return 0xff;
  131. }
  132.  
  133. static void fill_picture_parameters(const HEVCContext *h, VAPictureParameterBufferHEVC *pp)
  134. {
  135.     int i;
  136.  
  137.     pp->pic_fields.value = 0;
  138.     pp->slice_parsing_fields.value = 0;
  139.  
  140.     fill_vaapi_pic(&pp->CurrPic, h->ref, 0);
  141.     fill_vaapi_ReferenceFrames(h, pp);
  142.  
  143.     pp->pic_width_in_luma_samples  = h->ps.sps->width;
  144.     pp->pic_height_in_luma_samples = h->ps.sps->height;
  145.  
  146.     pp->log2_min_luma_coding_block_size_minus3 = h->ps.sps->log2_min_cb_size - 3;
  147.  
  148.     pp->pic_fields.bits.chroma_format_idc = h->ps.sps->chroma_format_idc;
  149.  
  150.     pp->sps_max_dec_pic_buffering_minus1 = h->ps.sps->temporal_layer[h->ps.sps->max_sub_layers - 1].max_dec_pic_buffering - 1;
  151.     pp->log2_diff_max_min_luma_coding_block_size = h->ps.sps->log2_diff_max_min_coding_block_size;
  152.     pp->log2_min_transform_block_size_minus2 = h->ps.sps->log2_min_tb_size - 2;
  153.     pp->log2_diff_max_min_transform_block_size = h->ps.sps->log2_max_trafo_size  - h->ps.sps->log2_min_tb_size;
  154.     pp->max_transform_hierarchy_depth_inter = h->ps.sps->max_transform_hierarchy_depth_inter;
  155.     pp->max_transform_hierarchy_depth_intra = h->ps.sps->max_transform_hierarchy_depth_intra;
  156.     pp->num_short_term_ref_pic_sets = h->ps.sps->nb_st_rps;
  157.     pp->num_long_term_ref_pic_sps = h->ps.sps->num_long_term_ref_pics_sps;
  158.  
  159.     pp->num_ref_idx_l0_default_active_minus1 = h->ps.pps->num_ref_idx_l0_default_active - 1;
  160.     pp->num_ref_idx_l1_default_active_minus1 = h->ps.pps->num_ref_idx_l1_default_active - 1;
  161.     pp->init_qp_minus26 = h->ps.pps->pic_init_qp_minus26;
  162.  
  163.     pp->pps_cb_qp_offset = h->ps.pps->cb_qp_offset;
  164.     pp->pps_cr_qp_offset = h->ps.pps->cr_qp_offset;
  165.  
  166.     pp->pic_fields.bits.tiles_enabled_flag = h->ps.pps->tiles_enabled_flag;
  167.     pp->pic_fields.bits.separate_colour_plane_flag = h->ps.sps->separate_colour_plane_flag;
  168.     pp->pic_fields.bits.pcm_enabled_flag = h->ps.sps->pcm_enabled_flag;
  169.     pp->pic_fields.bits.scaling_list_enabled_flag = h->ps.sps->scaling_list_enable_flag;
  170.     pp->pic_fields.bits.transform_skip_enabled_flag = h->ps.pps->transform_skip_enabled_flag;
  171.     pp->pic_fields.bits.amp_enabled_flag = h->ps.sps->amp_enabled_flag;
  172.     pp->pic_fields.bits.strong_intra_smoothing_enabled_flag = h->ps.sps->sps_strong_intra_smoothing_enable_flag;
  173.     pp->pic_fields.bits.sign_data_hiding_enabled_flag = h->ps.pps->sign_data_hiding_flag;
  174.     pp->pic_fields.bits.constrained_intra_pred_flag = h->ps.pps->constrained_intra_pred_flag;
  175.     pp->pic_fields.bits.cu_qp_delta_enabled_flag = h->ps.pps->cu_qp_delta_enabled_flag;
  176.     pp->pic_fields.bits.weighted_pred_flag = h->ps.pps->weighted_pred_flag;
  177.     pp->pic_fields.bits.weighted_bipred_flag = h->ps.pps->weighted_bipred_flag;
  178.     pp->pic_fields.bits.transquant_bypass_enabled_flag = h->ps.pps->transquant_bypass_enable_flag;
  179.     pp->pic_fields.bits.entropy_coding_sync_enabled_flag = h->ps.pps->entropy_coding_sync_enabled_flag;
  180.     pp->pic_fields.bits.pps_loop_filter_across_slices_enabled_flag = h->ps.pps->seq_loop_filter_across_slices_enabled_flag;
  181.     pp->pic_fields.bits.loop_filter_across_tiles_enabled_flag = h->ps.pps->loop_filter_across_tiles_enabled_flag;
  182.  
  183.     pp->pic_fields.bits.pcm_loop_filter_disabled_flag = h->ps.sps->pcm.loop_filter_disable_flag;
  184.     pp->pcm_sample_bit_depth_luma_minus1 = h->ps.sps->pcm.bit_depth - 1;
  185.     pp->pcm_sample_bit_depth_chroma_minus1 = h->ps.sps->pcm.bit_depth_chroma - 1;
  186.     pp->log2_min_pcm_luma_coding_block_size_minus3 = h->ps.sps->pcm.log2_min_pcm_cb_size - 3;
  187.     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;
  188.  
  189.     memset(pp->column_width_minus1, 0, sizeof(pp->column_width_minus1));
  190.     memset(pp->row_height_minus1, 0, sizeof(pp->row_height_minus1));
  191.  
  192.     if (h->ps.pps->tiles_enabled_flag) {
  193.         pp->num_tile_columns_minus1 = h->ps.pps->num_tile_columns - 1;
  194.         pp->num_tile_rows_minus1 = h->ps.pps->num_tile_rows - 1;
  195.  
  196.         for (i = 0; i < h->ps.pps->num_tile_columns; i++)
  197.             pp->column_width_minus1[i] = h->ps.pps->column_width[i] - 1;
  198.  
  199.         for (i = 0; i < h->ps.pps->num_tile_rows; i++)
  200.             pp->row_height_minus1[i] = h->ps.pps->row_height[i] - 1;
  201.     }
  202.  
  203.     pp->diff_cu_qp_delta_depth = h->ps.pps->diff_cu_qp_delta_depth;
  204.     pp->pps_beta_offset_div2 = h->ps.pps->beta_offset / 2;
  205.     pp->pps_tc_offset_div2 = h->ps.pps->tc_offset / 2;
  206.     pp->log2_parallel_merge_level_minus2 = h->ps.pps->log2_parallel_merge_level - 2;
  207.  
  208.     /* Different chroma/luma bit depths are currently not supported by ffmpeg. */
  209.     pp->bit_depth_luma_minus8 = h->ps.sps->bit_depth - 8;
  210.     pp->bit_depth_chroma_minus8 = h->ps.sps->bit_depth - 8;
  211.  
  212.     pp->slice_parsing_fields.bits.lists_modification_present_flag = h->ps.pps->lists_modification_present_flag;
  213.     pp->slice_parsing_fields.bits.long_term_ref_pics_present_flag = h->ps.sps->long_term_ref_pics_present_flag;
  214.     pp->slice_parsing_fields.bits.sps_temporal_mvp_enabled_flag = h->ps.sps->sps_temporal_mvp_enabled_flag;
  215.     pp->slice_parsing_fields.bits.cabac_init_present_flag = h->ps.pps->cabac_init_present_flag;
  216.     pp->slice_parsing_fields.bits.output_flag_present_flag = h->ps.pps->output_flag_present_flag;
  217.     pp->slice_parsing_fields.bits.dependent_slice_segments_enabled_flag = h->ps.pps->dependent_slice_segments_enabled_flag;
  218.     pp->slice_parsing_fields.bits.pps_slice_chroma_qp_offsets_present_flag = h->ps.pps->pic_slice_level_chroma_qp_offsets_present_flag;
  219.     pp->slice_parsing_fields.bits.sample_adaptive_offset_enabled_flag = h->ps.sps->sao_enabled;
  220.     pp->slice_parsing_fields.bits.deblocking_filter_override_enabled_flag = h->ps.pps->deblocking_filter_override_enabled_flag;
  221.     pp->slice_parsing_fields.bits.pps_disable_deblocking_filter_flag = h->ps.pps->disable_dbf;
  222.     pp->slice_parsing_fields.bits.slice_segment_header_extension_present_flag = h->ps.pps->slice_header_extension_present_flag;
  223.  
  224.     pp->log2_max_pic_order_cnt_lsb_minus4 = h->ps.sps->log2_max_poc_lsb - 4;
  225.     pp->num_extra_slice_header_bits = h->ps.pps->num_extra_slice_header_bits;
  226.  
  227.     if (h->nal_unit_type >= NAL_BLA_W_LP && h->nal_unit_type <= NAL_CRA_NUT) {
  228.         pp->slice_parsing_fields.bits.RapPicFlag = 1;
  229.     } else {
  230.         pp->slice_parsing_fields.bits.RapPicFlag = 0;
  231.     }
  232.  
  233.     if (IS_IDR(h)) {
  234.         pp->slice_parsing_fields.bits.IdrPicFlag = 1;
  235.     } else {
  236.         pp->slice_parsing_fields.bits.IdrPicFlag = 0;
  237.     }
  238.  
  239.     if (IS_IRAP(h)) {
  240.         pp->slice_parsing_fields.bits.IntraPicFlag = 1;
  241.     } else {
  242.         pp->slice_parsing_fields.bits.IntraPicFlag = 0;
  243.     }
  244.  
  245.     if (h->sh.short_term_ref_pic_set_sps_flag == 0 && h->sh.short_term_rps) {
  246.         pp->st_rps_bits = h->sh.short_term_ref_pic_set_size;
  247.     } else {
  248.         pp->st_rps_bits = 0;
  249.     }
  250.  
  251.     /* TODO */
  252.     pp->pic_fields.bits.NoPicReorderingFlag = 0;
  253.     pp->pic_fields.bits.NoBiPredFlag = 0;
  254. }
  255.  
  256.  
  257. /** Initialize and start decoding a frame with VA API. */
  258. static int vaapi_hevc_start_frame(AVCodecContext          *avctx,
  259.                                   av_unused const uint8_t *buffer,
  260.                                   av_unused uint32_t       size)
  261. {
  262.     HEVCContext * const h = avctx->priv_data;
  263.     FFVAContext * const vactx = ff_vaapi_get_context(avctx);
  264.     vaapi_hevc_frame_data *frame_data = h->ref->hwaccel_picture_private;
  265.     VAPictureParameterBufferHEVC *pic_param;
  266.     VAIQMatrixBufferHEVC *iq_matrix;
  267.     ScalingList const * scaling_list;
  268.     int i, j, pos;
  269.  
  270.     ff_dlog(avctx, "vaapi_hevc_start_frame()\n");
  271.  
  272.     vactx->slice_param_size = sizeof(VASliceParameterBufferHEVC);
  273.  
  274.     /* Fill in VAPictureParameterBufferHEVC. */
  275.     pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferHEVC));
  276.     if (!pic_param)
  277.         return -1;
  278.     fill_picture_parameters(h, pic_param);
  279.     frame_data->pic_param = pic_param;
  280.  
  281.     /* Fill in VAIQMatrixBufferHEVC. */
  282.     if (h->ps.pps->scaling_list_data_present_flag) {
  283.         scaling_list = &h->ps.pps->scaling_list;
  284.     } else if (h->ps.sps->scaling_list_enable_flag) {
  285.         scaling_list = &h->ps.sps->scaling_list;
  286.     } else {
  287.         return 0;
  288.     }
  289.  
  290.     iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferHEVC));
  291.     if (!iq_matrix)
  292.         return -1;
  293.  
  294.     for (i = 0; i < 6; ++i) {
  295.         for (j = 0; j < 16; ++j) {
  296.             pos = 4 * ff_hevc_diag_scan4x4_y[j] + ff_hevc_diag_scan4x4_x[j];
  297.             iq_matrix->ScalingList4x4[i][j] = scaling_list->sl[0][i][pos];
  298.         }
  299.         for (j = 0; j < 64; ++j) {
  300.             pos = 8 * ff_hevc_diag_scan8x8_y[j] + ff_hevc_diag_scan8x8_x[j];
  301.             iq_matrix->ScalingList8x8[i][j] = scaling_list->sl[1][i][pos];
  302.             iq_matrix->ScalingList16x16[i][j] = scaling_list->sl[2][i][pos];
  303.             if (i < 2) {
  304.                 iq_matrix->ScalingList32x32[i][j] = scaling_list->sl[3][i * 3][pos];
  305.             }
  306.         }
  307.         iq_matrix->ScalingListDC16x16[i] = scaling_list->sl_dc[0][i];
  308.         if (i < 2) {
  309.             iq_matrix->ScalingListDC32x32[i] = scaling_list->sl_dc[1][i * 3];
  310.         }
  311.     }
  312.  
  313.     return 0;
  314. }
  315.  
  316. /** End a hardware decoding based frame. */
  317. static int vaapi_hevc_end_frame(AVCodecContext *avctx)
  318. {
  319.     FFVAContext * const vactx = ff_vaapi_get_context(avctx);
  320.     HEVCContext * const h = avctx->priv_data;
  321.     vaapi_hevc_frame_data *frame_data = h->ref->hwaccel_picture_private;
  322.     int ret;
  323.  
  324.     ff_dlog(avctx, "vaapi_hevc_end_frame()\n");
  325.  
  326.     frame_data->last_slice_param->LongSliceFlags.fields.LastSliceOfPic = 1;
  327.  
  328.     ret = ff_vaapi_commit_slices(vactx);
  329.     if (ret < 0)
  330.         goto finish;
  331.  
  332.     ret = ff_vaapi_render_picture(vactx, ff_vaapi_get_surface_id(h->ref->frame));
  333.     if (ret < 0)
  334.         goto finish;
  335.  
  336. finish:
  337.     ff_vaapi_common_end_frame(avctx);
  338.     return ret;
  339. }
  340.  
  341. static int fill_pred_weight_table(HEVCContext * const h,
  342.                                   VASliceParameterBufferHEVC *slice_param,
  343.                                   SliceHeader * const sh)
  344. {
  345.     int i;
  346.  
  347.     memset(slice_param->delta_luma_weight_l0, 0, sizeof(slice_param->delta_luma_weight_l0));
  348.     memset(slice_param->delta_luma_weight_l1, 0, sizeof(slice_param->delta_luma_weight_l1));
  349.     memset(slice_param->luma_offset_l0, 0, sizeof(slice_param->luma_offset_l0));
  350.     memset(slice_param->luma_offset_l1, 0, sizeof(slice_param->luma_offset_l1));
  351.     memset(slice_param->delta_chroma_weight_l0, 0, sizeof(slice_param->delta_chroma_weight_l0));
  352.     memset(slice_param->delta_chroma_weight_l1, 0, sizeof(slice_param->delta_chroma_weight_l1));
  353.     memset(slice_param->ChromaOffsetL0, 0, sizeof(slice_param->ChromaOffsetL0));
  354.     memset(slice_param->ChromaOffsetL1, 0, sizeof(slice_param->ChromaOffsetL1));
  355.  
  356.     slice_param->delta_chroma_log2_weight_denom = 0;
  357.     slice_param->luma_log2_weight_denom = 0;
  358.  
  359.     if (  sh->slice_type == I_SLICE
  360.       || (sh->slice_type == P_SLICE && !h->ps.pps->weighted_pred_flag)
  361.       || (sh->slice_type == B_SLICE && !h->ps.pps->weighted_bipred_flag)) {
  362.         return 0;
  363.     }
  364.  
  365.     slice_param->luma_log2_weight_denom = sh->luma_log2_weight_denom;
  366.  
  367.     if (h->ps.sps->chroma_format_idc) {
  368.         slice_param->delta_chroma_log2_weight_denom = sh->chroma_log2_weight_denom - sh->luma_log2_weight_denom;
  369.     }
  370.  
  371.     for (i = 0; i < 15 && i < sh->nb_refs[L0]; ++i) {
  372.         slice_param->delta_luma_weight_l0[i] = sh->luma_weight_l0[i] - (1 << sh->luma_log2_weight_denom);
  373.         slice_param->luma_offset_l0[i] = sh->luma_offset_l0[i];
  374.         slice_param->delta_chroma_weight_l0[i][0] = sh->chroma_weight_l0[i][0] - (1 << sh->chroma_log2_weight_denom);
  375.         slice_param->delta_chroma_weight_l0[i][1] = sh->chroma_weight_l0[i][1] - (1 << sh->chroma_log2_weight_denom);
  376.         slice_param->ChromaOffsetL0[i][0] = sh->chroma_offset_l0[i][0];
  377.         slice_param->ChromaOffsetL0[i][1] = sh->chroma_offset_l0[i][1];
  378.     }
  379.  
  380.     if (sh->slice_type == B_SLICE) {
  381.         for (i = 0; i < 15 && i < sh->nb_refs[L1]; ++i) {
  382.             slice_param->delta_luma_weight_l1[i] = sh->luma_weight_l1[i] - (1 << sh->luma_log2_weight_denom);
  383.             slice_param->luma_offset_l1[i] = sh->luma_offset_l1[i];
  384.             slice_param->delta_chroma_weight_l1[i][0] = sh->chroma_weight_l1[i][0] - (1 << sh->chroma_log2_weight_denom);
  385.             slice_param->delta_chroma_weight_l1[i][1] = sh->chroma_weight_l1[i][1] - (1 << sh->chroma_log2_weight_denom);
  386.             slice_param->ChromaOffsetL1[i][0] = sh->chroma_offset_l1[i][0];
  387.             slice_param->ChromaOffsetL1[i][1] = sh->chroma_offset_l1[i][1];
  388.         }
  389.     }
  390.  
  391.     return 0;
  392. }
  393.  
  394. /** Decode the given hevc slice with VA API. */
  395. static int vaapi_hevc_decode_slice(AVCodecContext *avctx,
  396.                                    const uint8_t  *buffer,
  397.                                    uint32_t        size)
  398. {
  399.     FFVAContext * const vactx = ff_vaapi_get_context(avctx);
  400.     HEVCContext * const h = avctx->priv_data;
  401.     vaapi_hevc_frame_data *frame_data = h->ref->hwaccel_picture_private;
  402.     SliceHeader * const sh = &h->sh;
  403.     VASliceParameterBufferHEVC *slice_param;
  404.     int i, list_idx;
  405.     uint8_t nb_list = sh->slice_type == B_SLICE ? 2 : 1;
  406.  
  407.     if (sh->slice_type == I_SLICE)
  408.         nb_list = 0;
  409.  
  410.     ff_dlog(avctx, "vaapi_hevc_decode_slice(): buffer %p, size %d\n", buffer, size);
  411.  
  412.     /* Fill in VASliceParameterBufferH264. */
  413.     slice_param = (VASliceParameterBufferHEVC *)ff_vaapi_alloc_slice(vactx, buffer, size);
  414.     if (!slice_param)
  415.         return -1;
  416.  
  417.     frame_data->last_slice_param = slice_param;
  418.  
  419.     /* The base structure changed, so this has to be re-set in order to be valid on every byte order. */
  420.     slice_param->slice_data_flag = VA_SLICE_DATA_FLAG_ALL;
  421.  
  422.     /* 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. */
  423.     slice_param->slice_data_byte_offset = (get_bits_count(&h->HEVClc->gb) + 1 + 7) / 8;
  424.  
  425.     slice_param->slice_segment_address = sh->slice_segment_addr;
  426.  
  427.     slice_param->LongSliceFlags.value = 0;
  428.     slice_param->LongSliceFlags.fields.dependent_slice_segment_flag = sh->dependent_slice_segment_flag;
  429.     slice_param->LongSliceFlags.fields.slice_type = sh->slice_type;
  430.     slice_param->LongSliceFlags.fields.color_plane_id = sh->colour_plane_id;
  431.     slice_param->LongSliceFlags.fields.mvd_l1_zero_flag = sh->mvd_l1_zero_flag;
  432.     slice_param->LongSliceFlags.fields.cabac_init_flag = sh->cabac_init_flag;
  433.     slice_param->LongSliceFlags.fields.slice_temporal_mvp_enabled_flag = sh->slice_temporal_mvp_enabled_flag;
  434.     slice_param->LongSliceFlags.fields.slice_deblocking_filter_disabled_flag = sh->disable_deblocking_filter_flag;
  435.     slice_param->LongSliceFlags.fields.collocated_from_l0_flag = sh->collocated_list == L0 ? 1 : 0;
  436.     slice_param->LongSliceFlags.fields.slice_loop_filter_across_slices_enabled_flag = sh->slice_loop_filter_across_slices_enabled_flag;
  437.  
  438.     slice_param->LongSliceFlags.fields.slice_sao_luma_flag = sh->slice_sample_adaptive_offset_flag[0];
  439.     if (h->ps.sps->chroma_format_idc) {
  440.         slice_param->LongSliceFlags.fields.slice_sao_chroma_flag = sh->slice_sample_adaptive_offset_flag[1];
  441.     }
  442.  
  443.     if (sh->slice_temporal_mvp_enabled_flag) {
  444.         slice_param->collocated_ref_idx = sh->collocated_ref_idx;
  445.     } else {
  446.         slice_param->collocated_ref_idx = 0xFF;
  447.     }
  448.  
  449.     slice_param->slice_qp_delta = sh->slice_qp_delta;
  450.     slice_param->slice_cb_qp_offset = sh->slice_cb_qp_offset;
  451.     slice_param->slice_cr_qp_offset = sh->slice_cr_qp_offset;
  452.     slice_param->slice_beta_offset_div2 = sh->beta_offset / 2;
  453.     slice_param->slice_tc_offset_div2 = sh->tc_offset / 2;
  454.  
  455.     if (sh->slice_type == I_SLICE) {
  456.         slice_param->five_minus_max_num_merge_cand = 0;
  457.     } else {
  458.         slice_param->five_minus_max_num_merge_cand = 5 - sh->max_num_merge_cand;
  459.     }
  460.  
  461.     slice_param->num_ref_idx_l0_active_minus1 = sh->nb_refs[L0] ? sh->nb_refs[L0] - 1 : 0;
  462.     slice_param->num_ref_idx_l1_active_minus1 = sh->nb_refs[L1] ? sh->nb_refs[L1] - 1 : 0;
  463.  
  464.     memset(slice_param->RefPicList, 0xFF, sizeof(slice_param->RefPicList));
  465.  
  466.     /* h->ref->refPicList is updated befor calling each slice */
  467.     for (list_idx = 0; list_idx < nb_list; ++list_idx) {
  468.         RefPicList *rpl = &h->ref->refPicList[list_idx];
  469.  
  470.         for (i = 0; i < rpl->nb_refs; ++i) {
  471.             slice_param->RefPicList[list_idx][i] = get_ref_pic_index(h, rpl->ref[i]);
  472.         }
  473.     }
  474.  
  475.     return fill_pred_weight_table(h, slice_param, sh);
  476. }
  477.  
  478. AVHWAccel ff_hevc_vaapi_hwaccel = {
  479.     .name                 = "hevc_vaapi",
  480.     .type                 = AVMEDIA_TYPE_VIDEO,
  481.     .id                   = AV_CODEC_ID_HEVC,
  482.     .pix_fmt              = AV_PIX_FMT_VAAPI,
  483.     .start_frame          = vaapi_hevc_start_frame,
  484.     .end_frame            = vaapi_hevc_end_frame,
  485.     .decode_slice         = vaapi_hevc_decode_slice,
  486.     .init                 = ff_vaapi_context_init,
  487.     .uninit               = ff_vaapi_context_fini,
  488.     .priv_data_size       = sizeof(FFVAContext),
  489.     .frame_priv_data_size = sizeof(vaapi_hevc_frame_data),
  490. };
  491.