/*

  * 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 <va/va.h>
 #include <va/va_enc_hevc.h>
 
 #include "libavutil/avassert.h"
 #include "libavutil/internal.h"
 #include "libavutil/opt.h"
 #include "libavutil/pixfmt.h"
 
 #include "avcodec.h"

 #include "hevc.h"

 #include "internal.h"
 #include "put_bits.h"
 #include "vaapi_encode.h"
 #include "vaapi_encode_h26x.h"
 
 
 #define MAX_ST_REF_PIC_SETS  32
 #define MAX_DPB_PICS         16
 #define MAX_LAYERS            1
 
 
 typedef struct VAAPIEncodeH265STRPS {
     char inter_ref_pic_set_prediction_flag;
 
     unsigned int num_negative_pics;
     unsigned int num_positive_pics;
 
     unsigned int delta_poc_s0_minus1[MAX_DPB_PICS];
     char used_by_curr_pic_s0_flag[MAX_DPB_PICS];
 
     unsigned int delta_poc_s1_minus1[MAX_DPB_PICS];
     char used_by_curr_pic_s1_flag[MAX_DPB_PICS];
 } VAAPIEncodeH265STRPS;
 
 // This structure contains all possibly-useful per-sequence syntax elements
 // which are not already contained in the various VAAPI structures.
 typedef struct VAAPIEncodeH265MiscSequenceParams {
 
     // Parameter set IDs.
     unsigned int video_parameter_set_id;
     unsigned int seq_parameter_set_id;
 
     // Layering.
     unsigned int vps_max_layers_minus1;
     unsigned int vps_max_sub_layers_minus1;
     char vps_temporal_id_nesting_flag;
     unsigned int vps_max_layer_id;
     unsigned int vps_num_layer_sets_minus1;
     unsigned int sps_max_sub_layers_minus1;
     char sps_temporal_id_nesting_flag;
     char layer_id_included_flag[MAX_LAYERS][64];
 
     // Profile/tier/level parameters.
     char general_profile_compatibility_flag[32];
     char general_progressive_source_flag;
     char general_interlaced_source_flag;
     char general_non_packed_constraint_flag;
     char general_frame_only_constraint_flag;
     char general_inbld_flag;
 
     // Decode/display ordering parameters.
     unsigned int log2_max_pic_order_cnt_lsb_minus4;
     char vps_sub_layer_ordering_info_present_flag;
     unsigned int vps_max_dec_pic_buffering_minus1[MAX_LAYERS];
     unsigned int vps_max_num_reorder_pics[MAX_LAYERS];
     unsigned int vps_max_latency_increase_plus1[MAX_LAYERS];
     char sps_sub_layer_ordering_info_present_flag;
     unsigned int sps_max_dec_pic_buffering_minus1[MAX_LAYERS];
     unsigned int sps_max_num_reorder_pics[MAX_LAYERS];
     unsigned int sps_max_latency_increase_plus1[MAX_LAYERS];
 
     // Timing information.
     char vps_timing_info_present_flag;
     unsigned int vps_num_units_in_tick;
     unsigned int vps_time_scale;
     char vps_poc_proportional_to_timing_flag;
     unsigned int vps_num_ticks_poc_diff_minus1;
 
     // Cropping information.
     char conformance_window_flag;
     unsigned int conf_win_left_offset;
     unsigned int conf_win_right_offset;
     unsigned int conf_win_top_offset;
     unsigned int conf_win_bottom_offset;
 
     // Short-term reference picture sets.
     unsigned int num_short_term_ref_pic_sets;
     VAAPIEncodeH265STRPS st_ref_pic_set[MAX_ST_REF_PIC_SETS];
 
     // Long-term reference pictures.
     char long_term_ref_pics_present_flag;
     unsigned int num_long_term_ref_pics_sps;
     struct {
         unsigned int lt_ref_pic_poc_lsb_sps;
         char used_by_curr_pic_lt_sps_flag;
     } lt_ref_pic;
 
     // Deblocking filter control.
     char deblocking_filter_control_present_flag;
     char deblocking_filter_override_enabled_flag;
     char pps_deblocking_filter_disabled_flag;
     int pps_beta_offset_div2;
     int pps_tc_offset_div2;
 
     // Video Usability Information.
     char vui_parameters_present_flag;
     char aspect_ratio_info_present_flag;
     unsigned int aspect_ratio_idc;
     unsigned int sar_width;
     unsigned int sar_height;
     char video_signal_type_present_flag;
     unsigned int video_format;
     char video_full_range_flag;
     char colour_description_present_flag;
     unsigned int colour_primaries;
     unsigned int transfer_characteristics;
     unsigned int matrix_coeffs;
 
     // Oddments.
     char uniform_spacing_flag;
     char output_flag_present_flag;
     char cabac_init_present_flag;
     unsigned int num_extra_slice_header_bits;
     char lists_modification_present_flag;
     char pps_slice_chroma_qp_offsets_present_flag;
     char pps_slice_chroma_offset_list_enabled_flag;
 } VAAPIEncodeH265MiscSequenceParams;
 
 // This structure contains all possibly-useful per-slice syntax elements
 // which are not already contained in the various VAAPI structures.
 typedef struct VAAPIEncodeH265MiscSliceParams {
     // Slice segments.
     char first_slice_segment_in_pic_flag;
     unsigned int slice_segment_address;
 
     // Short-term reference picture sets.
     char short_term_ref_pic_set_sps_flag;
     unsigned int short_term_ref_pic_idx;
     VAAPIEncodeH265STRPS st_ref_pic_set;
 
     // Deblocking filter.
     char deblocking_filter_override_flag;
 
     // Oddments.
     char slice_reserved_flag[8];
     char no_output_of_prior_pics_flag;
     char pic_output_flag;
 } VAAPIEncodeH265MiscSliceParams;
 
 typedef struct VAAPIEncodeH265Slice {
     VAAPIEncodeH265MiscSliceParams misc_slice_params;
 
     int64_t pic_order_cnt;
 } VAAPIEncodeH265Slice;
 
 typedef struct VAAPIEncodeH265Context {
     VAAPIEncodeH265MiscSequenceParams misc_sequence_params;
 
     unsigned int ctu_width;
     unsigned int ctu_height;
 
     int fixed_qp_idr;
     int fixed_qp_p;
     int fixed_qp_b;
 
     int64_t last_idr_frame;

 
     // Rate control configuration.
     struct {
         VAEncMiscParameterBuffer misc;
         VAEncMiscParameterRateControl rc;
     } rc_params;
     struct {
         VAEncMiscParameterBuffer misc;
         VAEncMiscParameterHRD hrd;
     } hrd_params;

 } VAAPIEncodeH265Context;
 

 typedef struct VAAPIEncodeH265Options {
     int qp;
 } VAAPIEncodeH265Options;
 

 
 #define vseq_var(name)     vseq->name, name
 #define vseq_field(name)   vseq->seq_fields.bits.name, name
 #define vpic_var(name)     vpic->name, name
 #define vpic_field(name)   vpic->pic_fields.bits.name, name
 #define vslice_var(name)   vslice->name, name
 #define vslice_field(name) vslice->slice_fields.bits.name, name
 #define mseq_var(name)     mseq->name, name
 #define mslice_var(name)   mslice->name, name
 #define mstrps_var(name)   mstrps->name, name
 
 static void vaapi_encode_h265_write_nal_unit_header(PutBitContext *pbc,
                                                     int nal_unit_type)
 {
     u(1, 0, forbidden_zero_bit);
     u(6, nal_unit_type, nal_unit_type);
     u(6, 0, nuh_layer_id);
     u(3, 1, nuh_temporal_id_plus1);
 }
 
 static void vaapi_encode_h265_write_rbsp_trailing_bits(PutBitContext *pbc)
 {
     u(1, 1, rbsp_stop_one_bit);
     while (put_bits_count(pbc) & 7)
         u(1, 0, rbsp_alignment_zero_bit);
 }
 
 static void vaapi_encode_h265_write_profile_tier_level(PutBitContext *pbc,
                                                        VAAPIEncodeContext *ctx)
 {
     VAEncSequenceParameterBufferHEVC  *vseq = ctx->codec_sequence_params;
     VAAPIEncodeH265Context            *priv = ctx->priv_data;
     VAAPIEncodeH265MiscSequenceParams *mseq = &priv->misc_sequence_params;
     int j;
 
     if (1) {
         u(2, 0, general_profile_space);
         u(1, vseq_var(general_tier_flag));
         u(5, vseq_var(general_profile_idc));
 
         for (j = 0; j < 32; j++) {
             u(1, mseq_var(general_profile_compatibility_flag[j]));
         }
 
         u(1, mseq_var(general_progressive_source_flag));
         u(1, mseq_var(general_interlaced_source_flag));
         u(1, mseq_var(general_non_packed_constraint_flag));
         u(1, mseq_var(general_frame_only_constraint_flag));
 
         if (0) {
             // Not main profile.
             // Lots of extra constraint flags.
         } else {
             // put_bits only handles up to 31 bits.
             u(23, 0, general_reserved_zero_43bits);
             u(20, 0, general_reserved_zero_43bits);
         }
 
         if (vseq->general_profile_idc >= 1 && vseq->general_profile_idc <= 5) {
             u(1, mseq_var(general_inbld_flag));
         } else {
             u(1, 0, general_reserved_zero_bit);
         }
     }
 
     u(8, vseq_var(general_level_idc));
 
     // No sublayers.
 }
 
 static void vaapi_encode_h265_write_vps(PutBitContext *pbc,
                                         VAAPIEncodeContext *ctx)
 {
     VAAPIEncodeH265Context            *priv = ctx->priv_data;
     VAAPIEncodeH265MiscSequenceParams *mseq = &priv->misc_sequence_params;
     int i, j;
 

     vaapi_encode_h265_write_nal_unit_header(pbc, HEVC_NAL_VPS);

 
     u(4, mseq->video_parameter_set_id, vps_video_parameter_set_id);
 
     u(1, 1, vps_base_layer_internal_flag);
     u(1, 1, vps_base_layer_available_flag);
     u(6, mseq_var(vps_max_layers_minus1));
     u(3, mseq_var(vps_max_sub_layers_minus1));
     u(1, mseq_var(vps_temporal_id_nesting_flag));
 
     u(16, 0xffff, vps_reserved_0xffff_16bits);
 
     vaapi_encode_h265_write_profile_tier_level(pbc, ctx);
 
     u(1, mseq_var(vps_sub_layer_ordering_info_present_flag));
     for (i = (mseq->vps_sub_layer_ordering_info_present_flag ?
               0 : mseq->vps_max_sub_layers_minus1);
          i <= mseq->vps_max_sub_layers_minus1; i++) {
         ue(mseq_var(vps_max_dec_pic_buffering_minus1[i]));
         ue(mseq_var(vps_max_num_reorder_pics[i]));
         ue(mseq_var(vps_max_latency_increase_plus1[i]));
     }
 
     u(6, mseq_var(vps_max_layer_id));
     ue(mseq_var(vps_num_layer_sets_minus1));
     for (i = 1; i <= mseq->vps_num_layer_sets_minus1; i++) {
         for (j = 0; j < mseq->vps_max_layer_id; j++)
             u(1, mseq_var(layer_id_included_flag[i][j]));
     }
 
     u(1, mseq_var(vps_timing_info_present_flag));
     if (mseq->vps_timing_info_present_flag) {
         u(1, 0, put_bits_hack_zero_bit);
         u(31, mseq_var(vps_num_units_in_tick));
         u(1, 0, put_bits_hack_zero_bit);
         u(31, mseq_var(vps_time_scale));
         u(1, mseq_var(vps_poc_proportional_to_timing_flag));
         if (mseq->vps_poc_proportional_to_timing_flag) {
             ue(mseq_var(vps_num_ticks_poc_diff_minus1));
         }
         ue(0, vps_num_hrd_parameters);
     }
 
     u(1, 0, vps_extension_flag);
 
     vaapi_encode_h265_write_rbsp_trailing_bits(pbc);
 }
 
 static void vaapi_encode_h265_write_st_ref_pic_set(PutBitContext *pbc,
                                                    int st_rps_idx,
                                                    VAAPIEncodeH265STRPS *mstrps)
 {
     int i;
 
     if (st_rps_idx != 0)
        u(1, mstrps_var(inter_ref_pic_set_prediction_flag));
 
     if (mstrps->inter_ref_pic_set_prediction_flag) {
         av_assert0(0 && "inter ref pic set prediction not supported");
     } else {
         ue(mstrps_var(num_negative_pics));
         ue(mstrps_var(num_positive_pics));
 
         for (i = 0; i < mstrps->num_negative_pics; i++) {
             ue(mstrps_var(delta_poc_s0_minus1[i]));
             u(1, mstrps_var(used_by_curr_pic_s0_flag[i]));
         }
         for (i = 0; i < mstrps->num_positive_pics; i++) {
             ue(mstrps_var(delta_poc_s1_minus1[i]));
             u(1, mstrps_var(used_by_curr_pic_s1_flag[i]));
         }
     }
 }
 
 static void vaapi_encode_h265_write_vui_parameters(PutBitContext *pbc,
                                                    VAAPIEncodeContext *ctx)
 {
     VAAPIEncodeH265Context            *priv = ctx->priv_data;
     VAAPIEncodeH265MiscSequenceParams *mseq = &priv->misc_sequence_params;
 
     u(1, mseq_var(aspect_ratio_info_present_flag));
     if (mseq->aspect_ratio_info_present_flag) {
         u(8, mseq_var(aspect_ratio_idc));
         if (mseq->aspect_ratio_idc == 255) {
             u(16, mseq_var(sar_width));
             u(16, mseq_var(sar_height));
         }
     }
 
     u(1, 0, overscan_info_present_flag);
 
     u(1, mseq_var(video_signal_type_present_flag));
     if (mseq->video_signal_type_present_flag) {
         u(3, mseq_var(video_format));
         u(1, mseq_var(video_full_range_flag));
         u(1, mseq_var(colour_description_present_flag));
         if (mseq->colour_description_present_flag) {
             u(8, mseq_var(colour_primaries));
             u(8, mseq_var(transfer_characteristics));
             u(8, mseq_var(matrix_coeffs));
         }
     }
 
     u(1, 0, chroma_loc_info_present_flag);
     u(1, 0, neutral_chroma_indication_flag);
     u(1, 0, field_seq_flag);
     u(1, 0, frame_field_info_present_flag);
     u(1, 0, default_display_window_flag);
     u(1, 0, vui_timing_info_present_flag);
     u(1, 0, bitstream_restriction_flag_flag);
 }
 
 static void vaapi_encode_h265_write_sps(PutBitContext *pbc,
                                         VAAPIEncodeContext *ctx)
 {
     VAEncSequenceParameterBufferHEVC  *vseq = ctx->codec_sequence_params;
     VAAPIEncodeH265Context            *priv = ctx->priv_data;
     VAAPIEncodeH265MiscSequenceParams *mseq = &priv->misc_sequence_params;
     int i;
 

     vaapi_encode_h265_write_nal_unit_header(pbc, HEVC_NAL_SPS);

 
     u(4, mseq->video_parameter_set_id, sps_video_parameter_set_id);
 
     u(3, mseq_var(sps_max_sub_layers_minus1));
     u(1, mseq_var(sps_temporal_id_nesting_flag));
 
     vaapi_encode_h265_write_profile_tier_level(pbc, ctx);
 
     ue(mseq->seq_parameter_set_id, sps_seq_parameter_set_id);
     ue(vseq_field(chroma_format_idc));
     if (vseq->seq_fields.bits.chroma_format_idc == 3)
         u(1, 0, separate_colour_plane_flag);
 
     ue(vseq_var(pic_width_in_luma_samples));
     ue(vseq_var(pic_height_in_luma_samples));
 
     u(1, mseq_var(conformance_window_flag));
     if (mseq->conformance_window_flag) {
         ue(mseq_var(conf_win_left_offset));
         ue(mseq_var(conf_win_right_offset));
         ue(mseq_var(conf_win_top_offset));
         ue(mseq_var(conf_win_bottom_offset));
     }
 
     ue(vseq_field(bit_depth_luma_minus8));
     ue(vseq_field(bit_depth_chroma_minus8));
 
     ue(mseq_var(log2_max_pic_order_cnt_lsb_minus4));
 
     u(1, mseq_var(sps_sub_layer_ordering_info_present_flag));
     for (i = (mseq->sps_sub_layer_ordering_info_present_flag ?
               0 : mseq->sps_max_sub_layers_minus1);
          i <= mseq->sps_max_sub_layers_minus1; i++) {
         ue(mseq_var(sps_max_dec_pic_buffering_minus1[i]));
         ue(mseq_var(sps_max_num_reorder_pics[i]));
         ue(mseq_var(sps_max_latency_increase_plus1[i]));
     }
 
     ue(vseq_var(log2_min_luma_coding_block_size_minus3));
     ue(vseq_var(log2_diff_max_min_luma_coding_block_size));
     ue(vseq_var(log2_min_transform_block_size_minus2));
     ue(vseq_var(log2_diff_max_min_transform_block_size));
     ue(vseq_var(max_transform_hierarchy_depth_inter));
     ue(vseq_var(max_transform_hierarchy_depth_intra));
 
     u(1, vseq_field(scaling_list_enabled_flag));
     if (vseq->seq_fields.bits.scaling_list_enabled_flag) {
         u(1, 0, sps_scaling_list_data_present_flag);
     }
 
     u(1, vseq_field(amp_enabled_flag));
     u(1, vseq_field(sample_adaptive_offset_enabled_flag));
 
     u(1, vseq_field(pcm_enabled_flag));
     if (vseq->seq_fields.bits.pcm_enabled_flag) {
         u(4, vseq_var(pcm_sample_bit_depth_luma_minus1));
         u(4, vseq_var(pcm_sample_bit_depth_chroma_minus1));
         ue(vseq_var(log2_min_pcm_luma_coding_block_size_minus3));
         ue(vseq->log2_max_pcm_luma_coding_block_size_minus3 -
            vseq->log2_min_pcm_luma_coding_block_size_minus3,
            log2_diff_max_min_pcm_luma_coding_block_size);
         u(1, vseq_field(pcm_loop_filter_disabled_flag));
     }
 
     ue(mseq_var(num_short_term_ref_pic_sets));
     for (i = 0; i < mseq->num_short_term_ref_pic_sets; i++)
         vaapi_encode_h265_write_st_ref_pic_set(pbc, i,
                                                &mseq->st_ref_pic_set[i]);
 
     u(1, mseq_var(long_term_ref_pics_present_flag));
     if (mseq->long_term_ref_pics_present_flag) {
         ue(0, num_long_term_ref_pics_sps);
     }
 
     u(1, vseq_field(sps_temporal_mvp_enabled_flag));
     u(1, vseq_field(strong_intra_smoothing_enabled_flag));
 
     u(1, mseq_var(vui_parameters_present_flag));
     if (mseq->vui_parameters_present_flag) {
         vaapi_encode_h265_write_vui_parameters(pbc, ctx);
     }
 
     u(1, 0, sps_extension_present_flag);
 
     vaapi_encode_h265_write_rbsp_trailing_bits(pbc);
 }
 
 static void vaapi_encode_h265_write_pps(PutBitContext *pbc,
                                         VAAPIEncodeContext *ctx)
 {
     VAEncPictureParameterBufferHEVC   *vpic = ctx->codec_picture_params;
     VAAPIEncodeH265Context            *priv = ctx->priv_data;
     VAAPIEncodeH265MiscSequenceParams *mseq = &priv->misc_sequence_params;
     int i;
 

     vaapi_encode_h265_write_nal_unit_header(pbc, HEVC_NAL_PPS);

 
     ue(vpic->slice_pic_parameter_set_id, pps_pic_parameter_set_id);
     ue(mseq->seq_parameter_set_id, pps_seq_parameter_set_id);
 
     u(1, vpic_field(dependent_slice_segments_enabled_flag));
     u(1, mseq_var(output_flag_present_flag));
     u(3, mseq_var(num_extra_slice_header_bits));
     u(1, vpic_field(sign_data_hiding_enabled_flag));
     u(1, mseq_var(cabac_init_present_flag));
 
     ue(vpic_var(num_ref_idx_l0_default_active_minus1));
     ue(vpic_var(num_ref_idx_l1_default_active_minus1));
 
     se(vpic->pic_init_qp - 26, init_qp_minus26);
 
     u(1, vpic_field(constrained_intra_pred_flag));
     u(1, vpic_field(transform_skip_enabled_flag));
 
     u(1, vpic_field(cu_qp_delta_enabled_flag));
     if (vpic->pic_fields.bits.cu_qp_delta_enabled_flag)
         ue(vpic_var(diff_cu_qp_delta_depth));
 
     se(vpic_var(pps_cb_qp_offset));
     se(vpic_var(pps_cr_qp_offset));
 
     u(1, mseq_var(pps_slice_chroma_qp_offsets_present_flag));
     u(1, vpic_field(weighted_pred_flag));
     u(1, vpic_field(weighted_bipred_flag));
     u(1, vpic_field(transquant_bypass_enabled_flag));
     u(1, vpic_field(tiles_enabled_flag));
     u(1, vpic_field(entropy_coding_sync_enabled_flag));
 
     if (vpic->pic_fields.bits.tiles_enabled_flag) {
         ue(vpic_var(num_tile_columns_minus1));
         ue(vpic_var(num_tile_rows_minus1));
         u(1, mseq_var(uniform_spacing_flag));
         if (!mseq->uniform_spacing_flag) {
             for (i = 0; i < vpic->num_tile_columns_minus1; i++)
                 ue(vpic_var(column_width_minus1[i]));
             for (i = 0; i < vpic->num_tile_rows_minus1; i++)
                 ue(vpic_var(row_height_minus1[i]));
         }
         u(1, vpic_field(loop_filter_across_tiles_enabled_flag));
     }
 
     u(1, vpic_field(pps_loop_filter_across_slices_enabled_flag));
     u(1, mseq_var(deblocking_filter_control_present_flag));
     if (mseq->deblocking_filter_control_present_flag) {
         u(1, mseq_var(deblocking_filter_override_enabled_flag));
         u(1, mseq_var(pps_deblocking_filter_disabled_flag));
         if (!mseq->pps_deblocking_filter_disabled_flag) {
             se(mseq_var(pps_beta_offset_div2));
             se(mseq_var(pps_tc_offset_div2));
         }
     }
 
     u(1, 0, pps_scaling_list_data_present_flag);
     // No scaling list data.
 
     u(1, mseq_var(lists_modification_present_flag));
     ue(vpic_var(log2_parallel_merge_level_minus2));
     u(1, 0, slice_segment_header_extension_present_flag);
     u(1, 0, pps_extension_present_flag);
 
     vaapi_encode_h265_write_rbsp_trailing_bits(pbc);
 }
 
 static void vaapi_encode_h265_write_slice_header2(PutBitContext *pbc,
                                                   VAAPIEncodeContext *ctx,
                                                   VAAPIEncodePicture *pic,
                                                   VAAPIEncodeSlice *slice)
 {
     VAEncSequenceParameterBufferHEVC  *vseq = ctx->codec_sequence_params;
     VAEncPictureParameterBufferHEVC   *vpic = pic->codec_picture_params;
     VAEncSliceParameterBufferHEVC   *vslice = slice->codec_slice_params;
     VAAPIEncodeH265Context            *priv = ctx->priv_data;
     VAAPIEncodeH265MiscSequenceParams *mseq = &priv->misc_sequence_params;
     VAAPIEncodeH265Slice            *pslice = slice->priv_data;
     VAAPIEncodeH265MiscSliceParams  *mslice = &pslice->misc_slice_params;
     int i;
 
     vaapi_encode_h265_write_nal_unit_header(pbc, vpic->nal_unit_type);
 
     u(1, mslice_var(first_slice_segment_in_pic_flag));

     if (vpic->nal_unit_type >= HEVC_NAL_BLA_W_LP &&

        vpic->nal_unit_type <= 23)
         u(1, mslice_var(no_output_of_prior_pics_flag));
 
     ue(vslice_var(slice_pic_parameter_set_id));
 
     if (!mslice->first_slice_segment_in_pic_flag) {
         if (vpic->pic_fields.bits.dependent_slice_segments_enabled_flag)
             u(1, vslice_field(dependent_slice_segment_flag));
         u(av_log2((priv->ctu_width * priv->ctu_height) - 1) + 1,
           mslice_var(slice_segment_address));
     }
     if (!vslice->slice_fields.bits.dependent_slice_segment_flag) {
         for (i = 0; i < mseq->num_extra_slice_header_bits; i++)
             u(1, mslice_var(slice_reserved_flag[i]));
 
         ue(vslice_var(slice_type));
         if (mseq->output_flag_present_flag)
             u(1, 1, pic_output_flag);
         if (vseq->seq_fields.bits.separate_colour_plane_flag)
             u(2, vslice_field(colour_plane_id));

         if (vpic->nal_unit_type != HEVC_NAL_IDR_W_RADL &&
            vpic->nal_unit_type != HEVC_NAL_IDR_N_LP) {

             u(4 + mseq->log2_max_pic_order_cnt_lsb_minus4,
               (pslice->pic_order_cnt &
                ((1 << (mseq->log2_max_pic_order_cnt_lsb_minus4 + 4)) - 1)),
               slice_pic_order_cnt_lsb);
 
             u(1, mslice_var(short_term_ref_pic_set_sps_flag));
             if (!mslice->short_term_ref_pic_set_sps_flag) {
                 vaapi_encode_h265_write_st_ref_pic_set(pbc, mseq->num_short_term_ref_pic_sets,
                                                        &mslice->st_ref_pic_set);
             } else if (mseq->num_short_term_ref_pic_sets > 1) {
                 u(av_log2(mseq->num_short_term_ref_pic_sets - 1) + 1,
                   mslice_var(short_term_ref_pic_idx));
             }
 
             if (mseq->long_term_ref_pics_present_flag) {
                 av_assert0(0);
             }

         }

         if (vseq->seq_fields.bits.sps_temporal_mvp_enabled_flag) {
             u(1, vslice_field(slice_temporal_mvp_enabled_flag));
         }

         if (vseq->seq_fields.bits.sample_adaptive_offset_enabled_flag) {
             u(1, vslice_field(slice_sao_luma_flag));
             if (!vseq->seq_fields.bits.separate_colour_plane_flag &&
                 vseq->seq_fields.bits.chroma_format_idc != 0) {
                 u(1, vslice_field(slice_sao_chroma_flag));

             }

         }

         if (vslice->slice_type == HEVC_SLICE_P || vslice->slice_type == HEVC_SLICE_B) {

             u(1, vslice_field(num_ref_idx_active_override_flag));
             if (vslice->slice_fields.bits.num_ref_idx_active_override_flag) {
                 ue(vslice_var(num_ref_idx_l0_active_minus1));

                 if (vslice->slice_type == HEVC_SLICE_B) {

                     ue(vslice_var(num_ref_idx_l1_active_minus1));

                 }
             }
 

             if (mseq->lists_modification_present_flag) {
                 av_assert0(0);
                 // ref_pic_lists_modification()

             }

             if (vslice->slice_type == HEVC_SLICE_B) {

                 u(1, vslice_field(mvd_l1_zero_flag));

             }

             if (mseq->cabac_init_present_flag) {
                 u(1, vslice_field(cabac_init_flag));

             }

             if (vslice->slice_fields.bits.slice_temporal_mvp_enabled_flag) {

                 if (vslice->slice_type == HEVC_SLICE_B)

                     u(1, vslice_field(collocated_from_l0_flag));
                 ue(vpic->collocated_ref_pic_index, collocated_ref_idx);

             }

             if ((vpic->pic_fields.bits.weighted_pred_flag &&

                  vslice->slice_type == HEVC_SLICE_P) ||

                 (vpic->pic_fields.bits.weighted_bipred_flag &&

                  vslice->slice_type == HEVC_SLICE_B)) {

                 av_assert0(0);
                 // pred_weight_table()
             }
             ue(5 - vslice->max_num_merge_cand, five_minus_max_num_merge_cand);
         }
 
         se(vslice_var(slice_qp_delta));
         if (mseq->pps_slice_chroma_qp_offsets_present_flag) {
             se(vslice_var(slice_cb_qp_offset));
             se(vslice_var(slice_cr_qp_offset));
         }
         if (mseq->pps_slice_chroma_offset_list_enabled_flag) {
             u(1, 0, cu_chroma_qp_offset_enabled_flag);
         }
         if (mseq->deblocking_filter_override_enabled_flag) {
             u(1, mslice_var(deblocking_filter_override_flag));
         }
         if (mslice->deblocking_filter_override_flag) {
             u(1, vslice_field(slice_deblocking_filter_disabled_flag));
             if (!vslice->slice_fields.bits.slice_deblocking_filter_disabled_flag) {
                 se(vslice_var(slice_beta_offset_div2));
                 se(vslice_var(slice_tc_offset_div2));

             }
         }

         if (vpic->pic_fields.bits.pps_loop_filter_across_slices_enabled_flag &&
             (vslice->slice_fields.bits.slice_sao_luma_flag ||
              vslice->slice_fields.bits.slice_sao_chroma_flag ||
              vslice->slice_fields.bits.slice_deblocking_filter_disabled_flag)) {
             u(1, vslice_field(slice_loop_filter_across_slices_enabled_flag));
         }

 
         if (vpic->pic_fields.bits.tiles_enabled_flag ||
             vpic->pic_fields.bits.entropy_coding_sync_enabled_flag) {
             // num_entry_point_offsets
         }
 
         if (0) {
             // slice_segment_header_extension_length
         }
     }
 
     u(1, 1, alignment_bit_equal_to_one);
     while (put_bits_count(pbc) & 7)
         u(1, 0, alignment_bit_equal_to_zero);
 }
 
 static int vaapi_encode_h265_write_sequence_header(AVCodecContext *avctx,
                                                    char *data, size_t *data_len)
 {
     VAAPIEncodeContext *ctx = avctx->priv_data;
     PutBitContext pbc;
     char tmp[256];
     int err;
     size_t nal_len, bit_len, bit_pos, next_len;
 
     bit_len = *data_len;
     bit_pos = 0;
 
     init_put_bits(&pbc, tmp, sizeof(tmp));
     vaapi_encode_h265_write_vps(&pbc, ctx);
     nal_len = put_bits_count(&pbc);
     flush_put_bits(&pbc);
 
     next_len = bit_len - bit_pos;
     err = ff_vaapi_encode_h26x_nal_unit_to_byte_stream(data + bit_pos / 8,
                                                        &next_len,
                                                        tmp, nal_len);
     if (err < 0)
         return err;
     bit_pos += next_len;
 
     init_put_bits(&pbc, tmp, sizeof(tmp));
     vaapi_encode_h265_write_sps(&pbc, ctx);
     nal_len = put_bits_count(&pbc);
     flush_put_bits(&pbc);
 
     next_len = bit_len - bit_pos;
     err = ff_vaapi_encode_h26x_nal_unit_to_byte_stream(data + bit_pos / 8,
                                                        &next_len,
                                                        tmp, nal_len);
     if (err < 0)
         return err;
     bit_pos += next_len;
 
     init_put_bits(&pbc, tmp, sizeof(tmp));
     vaapi_encode_h265_write_pps(&pbc, ctx);
     nal_len = put_bits_count(&pbc);
     flush_put_bits(&pbc);
 
     next_len = bit_len - bit_pos;
     err = ff_vaapi_encode_h26x_nal_unit_to_byte_stream(data + bit_pos / 8,
                                                        &next_len,
                                                        tmp, nal_len);
     if (err < 0)
         return err;
     bit_pos += next_len;
 
     *data_len = bit_pos;
     return 0;
 }
 
 static int vaapi_encode_h265_write_slice_header(AVCodecContext *avctx,
                                                 VAAPIEncodePicture *pic,
                                                 VAAPIEncodeSlice *slice,
                                                 char *data, size_t *data_len)
 {
     VAAPIEncodeContext *ctx = avctx->priv_data;
     PutBitContext pbc;
     char tmp[256];
     size_t header_len;
 
     init_put_bits(&pbc, tmp, sizeof(tmp));
     vaapi_encode_h265_write_slice_header2(&pbc, ctx, pic, slice);
     header_len = put_bits_count(&pbc);
     flush_put_bits(&pbc);
 
     return ff_vaapi_encode_h26x_nal_unit_to_byte_stream(data, data_len,
                                                         tmp, header_len);
 }
 
 static int vaapi_encode_h265_init_sequence_params(AVCodecContext *avctx)
 {
     VAAPIEncodeContext                 *ctx = avctx->priv_data;
     VAEncSequenceParameterBufferHEVC  *vseq = ctx->codec_sequence_params;
     VAEncPictureParameterBufferHEVC   *vpic = ctx->codec_picture_params;
     VAAPIEncodeH265Context            *priv = ctx->priv_data;
     VAAPIEncodeH265MiscSequenceParams *mseq = &priv->misc_sequence_params;
     int i;
 
     {
         // general_profile_space == 0.
         vseq->general_profile_idc = 1; // Main profile (ctx->codec_profile?)
         vseq->general_tier_flag = 0;
 
         vseq->general_level_idc = avctx->level * 3;
 
         vseq->intra_period = 0;
         vseq->intra_idr_period = 0;
         vseq->ip_period = 0;
 

         vseq->pic_width_in_luma_samples  = ctx->surface_width;
         vseq->pic_height_in_luma_samples = ctx->surface_height;

 
         vseq->seq_fields.bits.chroma_format_idc = 1; // 4:2:0.
         vseq->seq_fields.bits.separate_colour_plane_flag = 0;

         vseq->seq_fields.bits.bit_depth_luma_minus8 =
             avctx->profile == FF_PROFILE_HEVC_MAIN_10 ? 2 : 0;
         vseq->seq_fields.bits.bit_depth_chroma_minus8 =
             avctx->profile == FF_PROFILE_HEVC_MAIN_10 ? 2 : 0;

         // Other misc flags all zero.
 
         // These have to come from the capabilities of the encoder.  We have
         // no way to query it, so just hardcode ones which worked for me...
         // CTB size from 8x8 to 32x32.
         vseq->log2_min_luma_coding_block_size_minus3 = 0;
         vseq->log2_diff_max_min_luma_coding_block_size = 2;
         // Transform size from 4x4 to 32x32.
         vseq->log2_min_transform_block_size_minus2 = 0;
         vseq->log2_diff_max_min_transform_block_size = 3;
         // Full transform hierarchy allowed (2-5).
         vseq->max_transform_hierarchy_depth_inter = 3;
         vseq->max_transform_hierarchy_depth_intra = 3;
 
         vseq->vui_parameters_present_flag = 0;

 
         vseq->bits_per_second = avctx->bit_rate;
         if (avctx->framerate.num > 0 && avctx->framerate.den > 0) {

             vseq->vui_num_units_in_tick = avctx->framerate.den;
             vseq->vui_time_scale        = avctx->framerate.num;

         } else {
             vseq->vui_num_units_in_tick = avctx->time_base.num;
             vseq->vui_time_scale        = avctx->time_base.den;
         }
 
         vseq->intra_period     = ctx->p_per_i * (ctx->b_per_p + 1);
         vseq->intra_idr_period = vseq->intra_period;
         vseq->ip_period        = ctx->b_per_p + 1;

     }
 
     {
         vpic->decoded_curr_pic.picture_id = VA_INVALID_ID;
         vpic->decoded_curr_pic.flags      = VA_PICTURE_HEVC_INVALID;
 
         for (i = 0; i < FF_ARRAY_ELEMS(vpic->reference_frames); i++) {
             vpic->reference_frames[i].picture_id = VA_INVALID_ID;
             vpic->reference_frames[i].flags      = VA_PICTURE_HEVC_INVALID;
         }
 
         vpic->collocated_ref_pic_index = 0xff;
 
         vpic->last_picture = 0;
 
         vpic->pic_init_qp = priv->fixed_qp_idr;
 
         vpic->diff_cu_qp_delta_depth = 0;
         vpic->pps_cb_qp_offset = 0;
         vpic->pps_cr_qp_offset = 0;
 
         // tiles_enabled_flag == 0, so ignore num_tile_(rows|columns)_minus1.
 
         vpic->log2_parallel_merge_level_minus2 = 0;
 
         // No limit on size.
         vpic->ctu_max_bitsize_allowed = 0;
 
         vpic->num_ref_idx_l0_default_active_minus1 = 0;
         vpic->num_ref_idx_l1_default_active_minus1 = 0;
 
         vpic->slice_pic_parameter_set_id = 0;
 
         vpic->pic_fields.bits.screen_content_flag = 0;
         vpic->pic_fields.bits.enable_gpu_weighted_prediction = 0;

 
         // Per-CU QP changes are required for non-constant-QP modes.
         vpic->pic_fields.bits.cu_qp_delta_enabled_flag =
             ctx->va_rc_mode != VA_RC_CQP;

     }
 
     {
         mseq->video_parameter_set_id = 5;
         mseq->seq_parameter_set_id = 5;
 
         mseq->vps_max_layers_minus1 = 0;
         mseq->vps_max_sub_layers_minus1 = 0;
         mseq->vps_temporal_id_nesting_flag = 1;
         mseq->sps_max_sub_layers_minus1 = 0;
         mseq->sps_temporal_id_nesting_flag = 1;
 
         for (i = 0; i < 32; i++) {
             mseq->general_profile_compatibility_flag[i] =
                 (i == vseq->general_profile_idc);
         }
 
         mseq->general_progressive_source_flag    = 1;
         mseq->general_interlaced_source_flag     = 0;
         mseq->general_non_packed_constraint_flag = 0;
         mseq->general_frame_only_constraint_flag = 1;
         mseq->general_inbld_flag = 0;
 
         mseq->log2_max_pic_order_cnt_lsb_minus4 = 8;
         mseq->vps_sub_layer_ordering_info_present_flag = 0;

         mseq->vps_max_dec_pic_buffering_minus1[0] = (avctx->max_b_frames > 0) + 1;
         mseq->vps_max_num_reorder_pics[0]         = (avctx->max_b_frames > 0);

         mseq->vps_max_latency_increase_plus1[0]   = 0;
         mseq->sps_sub_layer_ordering_info_present_flag = 0;

         mseq->sps_max_dec_pic_buffering_minus1[0] = (avctx->max_b_frames > 0) + 1;
         mseq->sps_max_num_reorder_pics[0]         = (avctx->max_b_frames > 0);

         mseq->sps_max_latency_increase_plus1[0]   = 0;
 
         mseq->vps_timing_info_present_flag = 1;
         mseq->vps_num_units_in_tick = avctx->time_base.num;
         mseq->vps_time_scale        = avctx->time_base.den;
         mseq->vps_poc_proportional_to_timing_flag = 1;
         mseq->vps_num_ticks_poc_diff_minus1 = 0;
 

         if (avctx->width  != ctx->surface_width ||
             avctx->height != ctx->surface_height) {

             mseq->conformance_window_flag = 1;
             mseq->conf_win_left_offset   = 0;
             mseq->conf_win_right_offset  =

                 (ctx->surface_width - avctx->width) / 2;

             mseq->conf_win_top_offset    = 0;
             mseq->conf_win_bottom_offset =

                 (ctx->surface_height - avctx->height) / 2;

         } else {
             mseq->conformance_window_flag = 0;
         }
 
         mseq->num_short_term_ref_pic_sets = 0;
         // STRPSs should ideally be here rather than repeated in each slice.
 
         mseq->vui_parameters_present_flag = 1;
         if (avctx->sample_aspect_ratio.num != 0) {
             mseq->aspect_ratio_info_present_flag = 1;
             if (avctx->sample_aspect_ratio.num ==
                 avctx->sample_aspect_ratio.den) {
                 mseq->aspect_ratio_idc = 1;
             } else {
                 mseq->aspect_ratio_idc = 255; // Extended SAR.
                 mseq->sar_width  = avctx->sample_aspect_ratio.num;
                 mseq->sar_height = avctx->sample_aspect_ratio.den;
             }
         }
         if (1) {
             // Should this be conditional on some of these being set?
             mseq->video_signal_type_present_flag = 1;
             mseq->video_format = 5; // Unspecified.
             mseq->video_full_range_flag = 0;
             mseq->colour_description_present_flag = 1;
             mseq->colour_primaries = avctx->color_primaries;
             mseq->transfer_characteristics = avctx->color_trc;
             mseq->matrix_coeffs = avctx->colorspace;
         }
     }
 
     return 0;
 }
 
 static int vaapi_encode_h265_init_picture_params(AVCodecContext *avctx,
                                                  VAAPIEncodePicture *pic)
 {
     VAAPIEncodeContext               *ctx = avctx->priv_data;
     VAEncPictureParameterBufferHEVC *vpic = pic->codec_picture_params;
     VAAPIEncodeH265Context          *priv = ctx->priv_data;
     int i;
 
     if (pic->type == PICTURE_TYPE_IDR) {
         av_assert0(pic->display_order == pic->encode_order);
         priv->last_idr_frame = pic->display_order;
     } else {
         av_assert0(pic->encode_order > priv->last_idr_frame);
         // Display order need not be if we have RA[SD]L pictures, though.
     }
 
     vpic->decoded_curr_pic.picture_id    = pic->recon_surface;
     vpic->decoded_curr_pic.pic_order_cnt =
         pic->display_order - priv->last_idr_frame;
     vpic->decoded_curr_pic.flags         = 0;
 
     for (i = 0; i < pic->nb_refs; i++) {
         VAAPIEncodePicture *ref = pic->refs[i];
         av_assert0(ref);
         vpic->reference_frames[i].picture_id    = ref->recon_surface;
         vpic->reference_frames[i].pic_order_cnt =
             ref->display_order - priv->last_idr_frame;
         vpic->reference_frames[i].flags =
             (ref->display_order < pic->display_order ?
              VA_PICTURE_HEVC_RPS_ST_CURR_BEFORE : 0) |
             (ref->display_order > pic->display_order ?
              VA_PICTURE_HEVC_RPS_ST_CURR_AFTER  : 0);
     }
     for (; i < FF_ARRAY_ELEMS(vpic->reference_frames); i++) {
         vpic->reference_frames[i].picture_id = VA_INVALID_ID;
         vpic->reference_frames[i].flags      = VA_PICTURE_HEVC_INVALID;
     }
 
     vpic->coded_buf = pic->output_buffer;
 
     switch (pic->type) {
     case PICTURE_TYPE_IDR:

         vpic->nal_unit_type = HEVC_NAL_IDR_W_RADL;

         vpic->pic_fields.bits.idr_pic_flag = 1;
         vpic->pic_fields.bits.coding_type  = 1;
         vpic->pic_fields.bits.reference_pic_flag = 1;
         break;
     case PICTURE_TYPE_I:

         vpic->nal_unit_type = HEVC_NAL_TRAIL_R;

         vpic->pic_fields.bits.idr_pic_flag = 0;
         vpic->pic_fields.bits.coding_type  = 1;
         vpic->pic_fields.bits.reference_pic_flag = 1;
         break;
     case PICTURE_TYPE_P:

         vpic->nal_unit_type = HEVC_NAL_TRAIL_R;

         vpic->pic_fields.bits.idr_pic_flag = 0;
         vpic->pic_fields.bits.coding_type  = 2;
         vpic->pic_fields.bits.reference_pic_flag = 1;
         break;
     case PICTURE_TYPE_B:

         vpic->nal_unit_type = HEVC_NAL_TRAIL_R;

         vpic->pic_fields.bits.idr_pic_flag = 0;
         vpic->pic_fields.bits.coding_type  = 3;
         vpic->pic_fields.bits.reference_pic_flag = 0;
         break;
     default:
         av_assert0(0 && "invalid picture type");
     }
 
     pic->nb_slices = 1;
 
     return 0;
 }
 
 static int vaapi_encode_h265_init_slice_params(AVCodecContext *avctx,
                                                VAAPIEncodePicture *pic,
                                                VAAPIEncodeSlice *slice)
 {
     VAAPIEncodeContext                *ctx = avctx->priv_data;
     VAEncPictureParameterBufferHEVC  *vpic = pic->codec_picture_params;
     VAEncSliceParameterBufferHEVC  *vslice = slice->codec_slice_params;
     VAAPIEncodeH265Context           *priv = ctx->priv_data;
     VAAPIEncodeH265Slice           *pslice;
     VAAPIEncodeH265MiscSliceParams *mslice;
     int i;
 
     slice->priv_data = av_mallocz(sizeof(*pslice));
     if (!slice->priv_data)
         return AVERROR(ENOMEM);
     pslice = slice->priv_data;
     mslice = &pslice->misc_slice_params;
 
     // Currently we only support one slice per frame.
     vslice->slice_segment_address = 0;
     vslice->num_ctu_in_slice = priv->ctu_width * priv->ctu_height;
 
     switch (pic->type) {
     case PICTURE_TYPE_IDR:
     case PICTURE_TYPE_I:

         vslice->slice_type = HEVC_SLICE_I;

         break;
     case PICTURE_TYPE_P:

         vslice->slice_type = HEVC_SLICE_P;

         break;
     case PICTURE_TYPE_B:

         vslice->slice_type = HEVC_SLICE_B;

         break;
     default:
         av_assert0(0 && "invalid picture type");
     }
 
     vslice->slice_pic_parameter_set_id = vpic->slice_pic_parameter_set_id;
 
     pslice->pic_order_cnt = pic->display_order - priv->last_idr_frame;
 
     for (i = 0; i < FF_ARRAY_ELEMS(vslice->ref_pic_list0); i++) {
         vslice->ref_pic_list0[i].picture_id = VA_INVALID_ID;
         vslice->ref_pic_list0[i].flags      = VA_PICTURE_HEVC_INVALID;
         vslice->ref_pic_list1[i].picture_id = VA_INVALID_ID;
         vslice->ref_pic_list1[i].flags      = VA_PICTURE_HEVC_INVALID;
     }
 
     av_assert0(pic->nb_refs <= 2);
     if (pic->nb_refs >= 1) {

         // Backward reference for P- or B-frame.

         av_assert0(pic->type == PICTURE_TYPE_P ||
                    pic->type == PICTURE_TYPE_B);
 
         vslice->num_ref_idx_l0_active_minus1 = 0;
         vslice->ref_pic_list0[0] = vpic->reference_frames[0];
     }
     if (pic->nb_refs >= 2) {

         // Forward reference for B-frame.

         av_assert0(pic->type == PICTURE_TYPE_B);
 
         vslice->num_ref_idx_l1_active_minus1 = 0;
         vslice->ref_pic_list1[0] = vpic->reference_frames[1];
     }
 
     vslice->max_num_merge_cand = 5;
 
     if (pic->type == PICTURE_TYPE_B)
         vslice->slice_qp_delta = priv->fixed_qp_b  - vpic->pic_init_qp;
     else if (pic->type == PICTURE_TYPE_P)
         vslice->slice_qp_delta = priv->fixed_qp_p - vpic->pic_init_qp;
     else
         vslice->slice_qp_delta = priv->fixed_qp_idr - vpic->pic_init_qp;
 
     vslice->slice_fields.bits.last_slice_of_pic_flag = 1;
 
     mslice->first_slice_segment_in_pic_flag = 1;
 
     if (pic->type == PICTURE_TYPE_IDR) {
         // No reference pictures.
     } else if (0) {
         mslice->short_term_ref_pic_set_sps_flag = 1;
         mslice->short_term_ref_pic_idx = 0;
     } else {
         VAAPIEncodePicture *st;
         int used;
 
         mslice->short_term_ref_pic_set_sps_flag = 0;
         mslice->st_ref_pic_set.inter_ref_pic_set_prediction_flag = 0;
 
         for (st = ctx->pic_start; st; st = st->next) {
             if (st->encode_order >= pic->encode_order) {
                 // Not yet in DPB.
                 continue;
             }
             used = 0;
             for (i = 0; i < pic->nb_refs; i++) {
                 if (pic->refs[i] == st)
                     used = 1;
             }
             if (!used) {
                 // Currently true, but need not be.
                 continue;
             }
             // This only works for one instance of each (delta_poc_sN_minus1
             // is relative to the previous frame in the list, not relative to
             // the current frame directly).
             if (st->display_order < pic->display_order) {
                 i = mslice->st_ref_pic_set.num_negative_pics;
                 mslice->st_ref_pic_set.delta_poc_s0_minus1[i] =
                     pic->display_order - st->display_order - 1;
                 mslice->st_ref_pic_set.used_by_curr_pic_s0_flag[i] = used;
                 ++mslice->st_ref_pic_set.num_negative_pics;
             } else {
                 i = mslice->st_ref_pic_set.num_positive_pics;
                 mslice->st_ref_pic_set.delta_poc_s1_minus1[i] =
                     st->display_order - pic->display_order - 1;
                 mslice->st_ref_pic_set.used_by_curr_pic_s1_flag[i] = used;
                 ++mslice->st_ref_pic_set.num_positive_pics;
             }
         }
     }
 
     return 0;
 }
 

 static av_cold int vaapi_encode_h265_configure(AVCodecContext *avctx)

 {
     VAAPIEncodeContext      *ctx = avctx->priv_data;
     VAAPIEncodeH265Context *priv = ctx->priv_data;

     VAAPIEncodeH265Options  *opt = ctx->codec_options;

     priv->ctu_width     = FFALIGN(ctx->surface_width,  32) / 32;
     priv->ctu_height    = FFALIGN(ctx->surface_height, 32) / 32;
 
     av_log(avctx, AV_LOG_VERBOSE, "Input %ux%u -> Surface %ux%u -> CTU %ux%u.\n",
            avctx->width, avctx->height, ctx->surface_width,
            ctx->surface_height, priv->ctu_width, priv->ctu_height);
 
     if (ctx->va_rc_mode == VA_RC_CQP) {
         priv->fixed_qp_p = opt->qp;
         if (avctx->i_quant_factor > 0.0)
             priv->fixed_qp_idr = (int)((priv->fixed_qp_p * avctx->i_quant_factor +
                                         avctx->i_quant_offset) + 0.5);
         else
             priv->fixed_qp_idr = priv->fixed_qp_p;
         if (avctx->b_quant_factor > 0.0)
             priv->fixed_qp_b = (int)((priv->fixed_qp_p * avctx->b_quant_factor +
                                       avctx->b_quant_offset) + 0.5);
         else
             priv->fixed_qp_b = priv->fixed_qp_p;
 
         av_log(avctx, AV_LOG_DEBUG, "Using fixed QP = "
                "%d / %d / %d for IDR- / P- / B-frames.\n",
                priv->fixed_qp_idr, priv->fixed_qp_p, priv->fixed_qp_b);
 
     } else if (ctx->va_rc_mode == VA_RC_CBR) {
         // These still need to be  set for pic_init_qp/slice_qp_delta.
         priv->fixed_qp_idr = 30;
         priv->fixed_qp_p   = 30;
         priv->fixed_qp_b   = 30;
 

         av_log(avctx, AV_LOG_DEBUG, "Using constant-bitrate = %"PRId64" bps.\n",

                avctx->bit_rate);
 
     } else {
         av_assert0(0 && "Invalid RC mode.");

     }
 

     return 0;
 }
 

 static const VAAPIEncodeType vaapi_encode_type_h265 = {
     .priv_data_size        = sizeof(VAAPIEncodeH265Context),

     .configure             = &vaapi_encode_h265_configure,

     .sequence_params_size  = sizeof(VAEncSequenceParameterBufferHEVC),
     .init_sequence_params  = &vaapi_encode_h265_init_sequence_params,

     .picture_params_size   = sizeof(VAEncPictureParameterBufferHEVC),
     .init_picture_params   = &vaapi_encode_h265_init_picture_params,
 
     .slice_params_size     = sizeof(VAEncSliceParameterBufferHEVC),
     .init_slice_params     = &vaapi_encode_h265_init_slice_params,
 
     .sequence_header_type  = VAEncPackedHeaderSequence,
     .write_sequence_header = &vaapi_encode_h265_write_sequence_header,
 
     .slice_header_type     = VAEncPackedHeaderHEVC_Slice,
     .write_slice_header    = &vaapi_encode_h265_write_slice_header,
 };
 
 static av_cold int vaapi_encode_h265_init(AVCodecContext *avctx)

 {

     VAAPIEncodeContext *ctx = avctx->priv_data;

     ctx->codec = &vaapi_encode_type_h265;

 
     switch (avctx->profile) {
     case FF_PROFILE_HEVC_MAIN:
     case FF_PROFILE_UNKNOWN:
         ctx->va_profile = VAProfileHEVCMain;

         ctx->va_rt_format = VA_RT_FORMAT_YUV420;

         break;
     case FF_PROFILE_HEVC_MAIN_10:

 #ifdef VA_RT_FORMAT_YUV420_10BPP
         ctx->va_profile = VAProfileHEVCMain10;
         ctx->va_rt_format = VA_RT_FORMAT_YUV420_10BPP;
         break;
 #else
         av_log(avctx, AV_LOG_ERROR, "10-bit encoding is not "
                "supported with this VAAPI version.\n");
         return AVERROR(ENOSYS);
 #endif

     default:
         av_log(avctx, AV_LOG_ERROR, "Unknown H.265 profile %d.\n",
                avctx->profile);
         return AVERROR(EINVAL);
     }
     ctx->va_entrypoint = VAEntrypointEncSlice;
 

     if (avctx->bit_rate > 0)

         ctx->va_rc_mode = VA_RC_CBR;

     else

         ctx->va_rc_mode = VA_RC_CQP;

     ctx->va_packed_headers =
         VA_ENC_PACKED_HEADER_SEQUENCE | // VPS, SPS and PPS.
         VA_ENC_PACKED_HEADER_SLICE;     // Slice headers.

     ctx->surface_width  = FFALIGN(avctx->width,  16);
     ctx->surface_height = FFALIGN(avctx->height, 16);

     return ff_vaapi_encode_init(avctx);

 }
 

 #define OFFSET(x) (offsetof(VAAPIEncodeContext, codec_options_data) + \
                    offsetof(VAAPIEncodeH265Options, x))
 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
 static const AVOption vaapi_encode_h265_options[] = {

     { "qp", "Constant QP (for P-frames; scaled by qfactor/qoffset for I/B)",

       OFFSET(qp), AV_OPT_TYPE_INT, { .i64 = 25 }, 0, 52, FLAGS },
     { NULL },
 };
 

 static const AVCodecDefault vaapi_encode_h265_defaults[] = {
     { "profile",        "1"   },
     { "level",          "51"  },
     { "b",              "0"   },
     { "bf",             "2"   },
     { "g",              "120" },

     { "i_qfactor",      "1"   },
     { "i_qoffset",      "0"   },
     { "b_qfactor",      "6/5" },
     { "b_qoffset",      "0"   },

     { NULL },
 };
 
 static const AVClass vaapi_encode_h265_class = {
     .class_name = "h265_vaapi",
     .item_name  = av_default_item_name,

     .option     = vaapi_encode_h265_options,

     .version    = LIBAVUTIL_VERSION_INT,
 };
 
 AVCodec ff_hevc_vaapi_encoder = {
     .name           = "hevc_vaapi",
     .long_name      = NULL_IF_CONFIG_SMALL("H.265/HEVC (VAAPI)"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_HEVC,

     .priv_data_size = (sizeof(VAAPIEncodeContext) +
                        sizeof(VAAPIEncodeH265Options)),

     .init           = &vaapi_encode_h265_init,
     .encode2        = &ff_vaapi_encode2,
     .close          = &ff_vaapi_encode_close,
     .priv_class     = &vaapi_encode_h265_class,
     .capabilities   = AV_CODEC_CAP_DELAY,
     .defaults       = vaapi_encode_h265_defaults,
     .pix_fmts = (const enum AVPixelFormat[]) {
         AV_PIX_FMT_VAAPI,
         AV_PIX_FMT_NONE,
     },
 };