/*

  * 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_h264.h>
 
 #include "libavutil/avassert.h"
 #include "libavutil/internal.h"
 #include "libavutil/opt.h"
 #include "libavutil/pixfmt.h"
 
 #include "avcodec.h"

 #include "h264.h"

 #include "h264_sei.h"

 #include "internal.h"
 #include "vaapi_encode.h"
 #include "vaapi_encode_h26x.h"
 
 enum {
     SLICE_TYPE_P  = 0,
     SLICE_TYPE_B  = 1,
     SLICE_TYPE_I  = 2,
     SLICE_TYPE_SP = 3,
     SLICE_TYPE_SI = 4,
 };
 
 // This structure contains all possibly-useful per-sequence syntax elements
 // which are not already contained in the various VAAPI structures.
 typedef struct VAAPIEncodeH264MiscSequenceParams {
     unsigned int profile_idc;
     char constraint_set0_flag;
     char constraint_set1_flag;
     char constraint_set2_flag;
     char constraint_set3_flag;
     char constraint_set4_flag;
     char constraint_set5_flag;
 
     char separate_colour_plane_flag;
     char qpprime_y_zero_transform_bypass_flag;
 
     char gaps_in_frame_num_allowed_flag;
     char delta_pic_order_always_zero_flag;
     char bottom_field_pic_order_in_frame_present_flag;
 
     unsigned int num_slice_groups_minus1;
     unsigned int slice_group_map_type;
 
     int pic_init_qs_minus26;
 

     char overscan_info_present_flag;
     char overscan_appropriate_flag;
 
     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_coefficients;
 
     char chroma_loc_info_present_flag;
     unsigned int chroma_sample_loc_type_top_field;
     unsigned int chroma_sample_loc_type_bottom_field;
 
     // Some timing elements are in VAEncSequenceParameterBufferH264.
     char fixed_frame_rate_flag;
 
     char nal_hrd_parameters_present_flag;
     char vcl_hrd_parameters_present_flag;
     char low_delay_hrd_flag;
     char pic_struct_present_flag;

 
     char motion_vectors_over_pic_boundaries_flag;
     unsigned int max_bytes_per_pic_denom;
     unsigned int max_bits_per_mb_denom;
     unsigned int max_num_reorder_frames;
     unsigned int max_dec_pic_buffering;

 
     unsigned int cpb_cnt_minus1;
     unsigned int bit_rate_scale;
     unsigned int cpb_size_scale;
     unsigned int bit_rate_value_minus1[32];
     unsigned int cpb_size_value_minus1[32];
     char cbr_flag[32];
     unsigned int initial_cpb_removal_delay_length_minus1;
     unsigned int cpb_removal_delay_length_minus1;
     unsigned int dpb_output_delay_length_minus1;
     unsigned int time_offset_length;
 
     unsigned int initial_cpb_removal_delay;
     unsigned int initial_cpb_removal_delay_offset;
 
     unsigned int pic_struct;

 } VAAPIEncodeH264MiscSequenceParams;
 
 // This structure contains all possibly-useful per-slice syntax elements
 // which are not already contained in the various VAAPI structures.
 typedef struct VAAPIEncodeH264MiscSliceParams {
     unsigned int nal_unit_type;
     unsigned int nal_ref_idc;
 
     unsigned int colour_plane_id;
     char field_pic_flag;
     char bottom_field_flag;
 
     unsigned int redundant_pic_cnt;
 
     char sp_for_switch_flag;
     int slice_qs_delta;
 
     char ref_pic_list_modification_flag_l0;
     char ref_pic_list_modification_flag_l1;
 
     char no_output_of_prior_pics_flag;
     char long_term_reference_flag;
     char adaptive_ref_pic_marking_mode_flag;
 } VAAPIEncodeH264MiscSliceParams;
 
 typedef struct VAAPIEncodeH264Slice {
     VAAPIEncodeH264MiscSliceParams misc_slice_params;
 } VAAPIEncodeH264Slice;
 
 typedef struct VAAPIEncodeH264Context {
     VAAPIEncodeH264MiscSequenceParams misc_sequence_params;
 
     int mb_width;
     int mb_height;
 
     int fixed_qp_idr;
     int fixed_qp_p;
     int fixed_qp_b;
 

     int next_frame_num;

     int64_t last_idr_frame;

     int64_t idr_pic_count;
 

     int cpb_delay;
     int dpb_delay;
 

     // Rate control configuration.

     int send_timing_sei;

 } VAAPIEncodeH264Context;
 

 typedef struct VAAPIEncodeH264Options {
     int qp;

     int quality;

     int low_power;

     // Entropy encoder type.
     int coder;

 } VAAPIEncodeH264Options;
 

 
 #define vseq_var(name)     vseq->name, name
 #define vseq_field(name)   vseq->seq_fields.bits.name, name

 #define vvui_field(name)   vseq->vui_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
 
 static void vaapi_encode_h264_write_nal_header(PutBitContext *pbc,
                                                int nal_unit_type, int nal_ref_idc)
 {
     u(1, 0, forbidden_zero_bit);
     u(2, nal_ref_idc, nal_ref_idc);
     u(5, nal_unit_type, nal_unit_type);
 }
 
 static void vaapi_encode_h264_write_trailing_rbsp(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_h264_write_vui(PutBitContext *pbc,
                                         VAAPIEncodeContext *ctx)
 {
     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
     VAAPIEncodeH264Context            *priv = ctx->priv_data;
     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;

     int i;

 
     u(1, vvui_field(aspect_ratio_info_present_flag));
     if (vseq->vui_fields.bits.aspect_ratio_info_present_flag) {
         u(8, vseq_var(aspect_ratio_idc));
         if (vseq->aspect_ratio_idc == 255) {
             u(16, vseq_var(sar_width));
             u(16, vseq_var(sar_height));
         }
     }
 
     u(1, mseq_var(overscan_info_present_flag));
     if (mseq->overscan_info_present_flag)
         u(1, mseq_var(overscan_appropriate_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_coefficients));
         }
     }
 
     u(1, mseq_var(chroma_loc_info_present_flag));
     if (mseq->chroma_loc_info_present_flag) {
         ue(mseq_var(chroma_sample_loc_type_top_field));
         ue(mseq_var(chroma_sample_loc_type_bottom_field));
     }
 
     u(1, vvui_field(timing_info_present_flag));
     if (vseq->vui_fields.bits.timing_info_present_flag) {
         u(32, vseq_var(num_units_in_tick));
         u(32, vseq_var(time_scale));
         u(1, mseq_var(fixed_frame_rate_flag));
     }
 
     u(1, mseq_var(nal_hrd_parameters_present_flag));
     if (mseq->nal_hrd_parameters_present_flag) {

         ue(mseq_var(cpb_cnt_minus1));
         u(4, mseq_var(bit_rate_scale));
         u(4, mseq_var(cpb_size_scale));
         for (i = 0; i <= mseq->cpb_cnt_minus1; i++) {
             ue(mseq_var(bit_rate_value_minus1[i]));
             ue(mseq_var(cpb_size_value_minus1[i]));
             u(1, mseq_var(cbr_flag[i]));
         }
         u(5, mseq_var(initial_cpb_removal_delay_length_minus1));
         u(5, mseq_var(cpb_removal_delay_length_minus1));
         u(5, mseq_var(dpb_output_delay_length_minus1));
         u(5, mseq_var(time_offset_length));

     }
     u(1, mseq_var(vcl_hrd_parameters_present_flag));
     if (mseq->vcl_hrd_parameters_present_flag) {
         av_assert0(0 && "vcl hrd parameters not supported");
     }
 
     if (mseq->nal_hrd_parameters_present_flag ||
         mseq->vcl_hrd_parameters_present_flag)
         u(1, mseq_var(low_delay_hrd_flag));
     u(1, mseq_var(pic_struct_present_flag));
 
     u(1, vvui_field(bitstream_restriction_flag));
     if (vseq->vui_fields.bits.bitstream_restriction_flag) {

         u(1, mseq_var(motion_vectors_over_pic_boundaries_flag));
         ue(mseq_var(max_bytes_per_pic_denom));
         ue(mseq_var(max_bits_per_mb_denom));
         ue(vvui_field(log2_max_mv_length_horizontal));
         ue(vvui_field(log2_max_mv_length_vertical));
         ue(mseq_var(max_num_reorder_frames));
         ue(mseq_var(max_dec_pic_buffering));

     }
 }
 

 static void vaapi_encode_h264_write_sps(PutBitContext *pbc,
                                         VAAPIEncodeContext *ctx)
 {
     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
     VAAPIEncodeH264Context            *priv = ctx->priv_data;
     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
     int i;
 

     vaapi_encode_h264_write_nal_header(pbc, H264_NAL_SPS, 3);

 
     u(8, mseq_var(profile_idc));
     u(1, mseq_var(constraint_set0_flag));
     u(1, mseq_var(constraint_set1_flag));
     u(1, mseq_var(constraint_set2_flag));
     u(1, mseq_var(constraint_set3_flag));
     u(1, mseq_var(constraint_set4_flag));
     u(1, mseq_var(constraint_set5_flag));
     u(2, 0, reserved_zero_2bits);
 
     u(8, vseq_var(level_idc));
 
     ue(vseq_var(seq_parameter_set_id));
 
     if (mseq->profile_idc == 100 || mseq->profile_idc == 110 ||
         mseq->profile_idc == 122 || mseq->profile_idc == 244 ||
         mseq->profile_idc ==  44 || mseq->profile_idc ==  83 ||
         mseq->profile_idc ==  86 || mseq->profile_idc == 118 ||
         mseq->profile_idc == 128 || mseq->profile_idc == 138) {
         ue(vseq_field(chroma_format_idc));
 
         if (vseq->seq_fields.bits.chroma_format_idc == 3)
             u(1, mseq_var(separate_colour_plane_flag));
 
         ue(vseq_var(bit_depth_luma_minus8));
         ue(vseq_var(bit_depth_chroma_minus8));
 
         u(1, mseq_var(qpprime_y_zero_transform_bypass_flag));
 
         u(1, vseq_field(seq_scaling_matrix_present_flag));
         if (vseq->seq_fields.bits.seq_scaling_matrix_present_flag) {
             av_assert0(0 && "scaling matrices not supported");
         }
     }
 
     ue(vseq_field(log2_max_frame_num_minus4));
     ue(vseq_field(pic_order_cnt_type));
 
     if (vseq->seq_fields.bits.pic_order_cnt_type == 0) {
         ue(vseq_field(log2_max_pic_order_cnt_lsb_minus4));
     } else if (vseq->seq_fields.bits.pic_order_cnt_type == 1) {
         u(1, mseq_var(delta_pic_order_always_zero_flag));
         se(vseq_var(offset_for_non_ref_pic));
         se(vseq_var(offset_for_top_to_bottom_field));
         ue(vseq_var(num_ref_frames_in_pic_order_cnt_cycle));
 
         for (i = 0; i < vseq->num_ref_frames_in_pic_order_cnt_cycle; i++)
             se(vseq_var(offset_for_ref_frame[i]));
     }
 
     ue(vseq_var(max_num_ref_frames));
     u(1, mseq_var(gaps_in_frame_num_allowed_flag));
 
     ue(vseq->picture_width_in_mbs  - 1, pic_width_in_mbs_minus1);
     ue(vseq->picture_height_in_mbs - 1, pic_height_in_mbs_minus1);
 
     u(1, vseq_field(frame_mbs_only_flag));
     if (!vseq->seq_fields.bits.frame_mbs_only_flag)
         u(1, vseq_field(mb_adaptive_frame_field_flag));
 
     u(1, vseq_field(direct_8x8_inference_flag));
 
     u(1, vseq_var(frame_cropping_flag));
     if (vseq->frame_cropping_flag) {
         ue(vseq_var(frame_crop_left_offset));
         ue(vseq_var(frame_crop_right_offset));
         ue(vseq_var(frame_crop_top_offset));
         ue(vseq_var(frame_crop_bottom_offset));
     }
 

     u(1, vseq_var(vui_parameters_present_flag));
     if (vseq->vui_parameters_present_flag)
         vaapi_encode_h264_write_vui(pbc, ctx);

 
     vaapi_encode_h264_write_trailing_rbsp(pbc);
 }
 
 static void vaapi_encode_h264_write_pps(PutBitContext *pbc,
                                         VAAPIEncodeContext *ctx)
 {
     VAEncPictureParameterBufferH264   *vpic = ctx->codec_picture_params;
     VAAPIEncodeH264Context            *priv = ctx->priv_data;
     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
 

     vaapi_encode_h264_write_nal_header(pbc, H264_NAL_PPS, 3);

 
     ue(vpic_var(pic_parameter_set_id));
     ue(vpic_var(seq_parameter_set_id));
 
     u(1, vpic_field(entropy_coding_mode_flag));
     u(1, mseq_var(bottom_field_pic_order_in_frame_present_flag));
 
     ue(mseq_var(num_slice_groups_minus1));
     if (mseq->num_slice_groups_minus1 > 0) {
         ue(mseq_var(slice_group_map_type));
         av_assert0(0 && "slice groups not supported");
     }
 
     ue(vpic_var(num_ref_idx_l0_active_minus1));
     ue(vpic_var(num_ref_idx_l1_active_minus1));
 
     u(1, vpic_field(weighted_pred_flag));
     u(2, vpic_field(weighted_bipred_idc));
 
     se(vpic->pic_init_qp - 26, pic_init_qp_minus26);
     se(mseq_var(pic_init_qs_minus26));
     se(vpic_var(chroma_qp_index_offset));
 
     u(1, vpic_field(deblocking_filter_control_present_flag));
     u(1, vpic_field(constrained_intra_pred_flag));
     u(1, vpic_field(redundant_pic_cnt_present_flag));
     u(1, vpic_field(transform_8x8_mode_flag));
 
     u(1, vpic_field(pic_scaling_matrix_present_flag));
     if (vpic->pic_fields.bits.pic_scaling_matrix_present_flag) {
         av_assert0(0 && "scaling matrices not supported");
     }
 
     se(vpic_var(second_chroma_qp_index_offset));
 
     vaapi_encode_h264_write_trailing_rbsp(pbc);
 }
 
 static void vaapi_encode_h264_write_slice_header2(PutBitContext *pbc,
                                                   VAAPIEncodeContext *ctx,
                                                   VAAPIEncodePicture *pic,
                                                   VAAPIEncodeSlice *slice)
 {
     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
     VAEncPictureParameterBufferH264   *vpic = pic->codec_picture_params;
     VAEncSliceParameterBufferH264   *vslice = slice->codec_slice_params;
     VAAPIEncodeH264Context            *priv = ctx->priv_data;
     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
     VAAPIEncodeH264Slice            *pslice = slice->priv_data;
     VAAPIEncodeH264MiscSliceParams  *mslice = &pslice->misc_slice_params;
 
     vaapi_encode_h264_write_nal_header(pbc, mslice->nal_unit_type,
                                        mslice->nal_ref_idc);
 
     ue(vslice->macroblock_address, first_mb_in_slice);
     ue(vslice_var(slice_type));
     ue(vpic_var(pic_parameter_set_id));
 
     if (mseq->separate_colour_plane_flag) {
         u(2, mslice_var(colour_plane_id));
     }
 
     u(4 + vseq->seq_fields.bits.log2_max_frame_num_minus4,
       (vpic->frame_num &
        ((1 << (4 + vseq->seq_fields.bits.log2_max_frame_num_minus4)) - 1)),
       frame_num);
 
     if (!vseq->seq_fields.bits.frame_mbs_only_flag) {
         u(1, mslice_var(field_pic_flag));
         if (mslice->field_pic_flag)
             u(1, mslice_var(bottom_field_flag));
     }
 
     if (vpic->pic_fields.bits.idr_pic_flag) {
         ue(vslice_var(idr_pic_id));
     }
 
     if (vseq->seq_fields.bits.pic_order_cnt_type == 0) {
         u(4 + vseq->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4,
           vslice_var(pic_order_cnt_lsb));
         if (mseq->bottom_field_pic_order_in_frame_present_flag &&
             !mslice->field_pic_flag) {
             se(vslice_var(delta_pic_order_cnt_bottom));
         }
     }
 
     if (vseq->seq_fields.bits.pic_order_cnt_type == 1 &&
         !vseq->seq_fields.bits.delta_pic_order_always_zero_flag) {
         se(vslice_var(delta_pic_order_cnt[0]));
         if (mseq->bottom_field_pic_order_in_frame_present_flag &&
             !mslice->field_pic_flag) {
             se(vslice_var(delta_pic_order_cnt[1]));
         }
     }
 
     if (vpic->pic_fields.bits.redundant_pic_cnt_present_flag) {
         ue(mslice_var(redundant_pic_cnt));
     }
 
     if (vslice->slice_type == SLICE_TYPE_B) {
         u(1, vslice_var(direct_spatial_mv_pred_flag));
     }
 
     if (vslice->slice_type == SLICE_TYPE_P ||
         vslice->slice_type == SLICE_TYPE_SP ||
         vslice->slice_type == SLICE_TYPE_B) {
         u(1, vslice_var(num_ref_idx_active_override_flag));
         if (vslice->num_ref_idx_active_override_flag) {
             ue(vslice_var(num_ref_idx_l0_active_minus1));
             if (vslice->slice_type == SLICE_TYPE_B)
                 ue(vslice_var(num_ref_idx_l1_active_minus1));
         }
     }
 
     if (mslice->nal_unit_type == 20 || mslice->nal_unit_type == 21) {
         av_assert0(0 && "no MVC support");
     } else {
         if (vslice->slice_type % 5 != 2 && vslice->slice_type % 5 != 4) {
             u(1, mslice_var(ref_pic_list_modification_flag_l0));
             if (mslice->ref_pic_list_modification_flag_l0) {
                 av_assert0(0 && "ref pic list modification");
             }
         }
         if (vslice->slice_type % 5 == 1) {
             u(1, mslice_var(ref_pic_list_modification_flag_l1));
             if (mslice->ref_pic_list_modification_flag_l1) {
                 av_assert0(0 && "ref pic list modification");
             }
         }
     }
 
     if ((vpic->pic_fields.bits.weighted_pred_flag &&
          (vslice->slice_type == SLICE_TYPE_P ||
           vslice->slice_type == SLICE_TYPE_SP)) ||
         (vpic->pic_fields.bits.weighted_bipred_idc == 1 &&
          vslice->slice_type == SLICE_TYPE_B)) {
         av_assert0(0 && "prediction weights not supported");
     }
 
     av_assert0(mslice->nal_ref_idc > 0 ==
                vpic->pic_fields.bits.reference_pic_flag);
     if (mslice->nal_ref_idc != 0) {
         if (vpic->pic_fields.bits.idr_pic_flag) {
             u(1, mslice_var(no_output_of_prior_pics_flag));
             u(1, mslice_var(long_term_reference_flag));
         } else {
             u(1, mslice_var(adaptive_ref_pic_marking_mode_flag));
             if (mslice->adaptive_ref_pic_marking_mode_flag) {
                 av_assert0(0 && "MMCOs not supported");
             }
         }
     }
 
     if (vpic->pic_fields.bits.entropy_coding_mode_flag &&
         vslice->slice_type != SLICE_TYPE_I &&
         vslice->slice_type != SLICE_TYPE_SI) {
         ue(vslice_var(cabac_init_idc));
     }
 
     se(vslice_var(slice_qp_delta));
     if (vslice->slice_type == SLICE_TYPE_SP ||
         vslice->slice_type == SLICE_TYPE_SI) {
         if (vslice->slice_type == SLICE_TYPE_SP)
             u(1, mslice_var(sp_for_switch_flag));
         se(mslice_var(slice_qs_delta));
     }
 
     if (vpic->pic_fields.bits.deblocking_filter_control_present_flag) {
         ue(vslice_var(disable_deblocking_filter_idc));
         if (vslice->disable_deblocking_filter_idc != 1) {
             se(vslice_var(slice_alpha_c0_offset_div2));
             se(vslice_var(slice_beta_offset_div2));
         }
     }
 
     if (mseq->num_slice_groups_minus1 > 0 &&
         mseq->slice_group_map_type >= 3 && mseq->slice_group_map_type <= 5) {
         av_assert0(0 && "slice groups not supported");
     }
 
     // No alignment - this need not be a byte boundary.
 }
 

 static void vaapi_encode_h264_write_buffering_period(PutBitContext *pbc,
                                                      VAAPIEncodeContext *ctx,
                                                      VAAPIEncodePicture *pic)
 {
     VAAPIEncodeH264Context            *priv = ctx->priv_data;
     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
     VAEncPictureParameterBufferH264   *vpic = pic->codec_picture_params;
     int i;
 
     ue(vpic_var(seq_parameter_set_id));
 
     if (mseq->nal_hrd_parameters_present_flag) {
         for (i = 0; i <= mseq->cpb_cnt_minus1; i++) {
             u(mseq->initial_cpb_removal_delay_length_minus1 + 1,
               mseq_var(initial_cpb_removal_delay));
             u(mseq->initial_cpb_removal_delay_length_minus1 + 1,
               mseq_var(initial_cpb_removal_delay_offset));
         }
     }
     if (mseq->vcl_hrd_parameters_present_flag) {
         av_assert0(0 && "vcl hrd parameters not supported");
     }
 }
 
 static void vaapi_encode_h264_write_pic_timing(PutBitContext *pbc,
                                                VAAPIEncodeContext *ctx,
                                                VAAPIEncodePicture *pic)
 {
     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
     VAAPIEncodeH264Context            *priv = ctx->priv_data;
     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
     int i, num_clock_ts;
 
     if (mseq->nal_hrd_parameters_present_flag ||
         mseq->vcl_hrd_parameters_present_flag) {
         u(mseq->cpb_removal_delay_length_minus1 + 1,
           2 * vseq->num_units_in_tick * priv->cpb_delay,
           cpb_removal_delay);
         u(mseq->dpb_output_delay_length_minus1 + 1,
           2 * vseq->num_units_in_tick * priv->dpb_delay,
           dpb_output_delay);
     }
     if (mseq->pic_struct_present_flag) {
         u(4, mseq_var(pic_struct));
         num_clock_ts = (mseq->pic_struct <= 2 ? 1 :
                         mseq->pic_struct <= 4 ? 2 :
                         mseq->pic_struct <= 8 ? 3 : 0);
         for (i = 0; i < num_clock_ts; i++) {
             u(1, 0, clock_timestamp_flag[i]);
             // No full timestamp information.
         }
     }
 }
 

 static void vaapi_encode_h264_write_identifier(PutBitContext *pbc,
                                                VAAPIEncodeContext *ctx,
                                                VAAPIEncodePicture *pic)
 {
     const char *lavc   = LIBAVCODEC_IDENT;
     const char *vaapi  = VA_VERSION_S;
     const char *driver = vaQueryVendorString(ctx->hwctx->display);
     char tmp[256];
     int i;
 
     // Random (version 4) ISO 11578 UUID.
     uint8_t uuid[16] = {
         0x59, 0x94, 0x8b, 0x28, 0x11, 0xec, 0x45, 0xaf,
         0x96, 0x75, 0x19, 0xd4, 0x1f, 0xea, 0xa9, 0x4d,
     };
 
     for (i = 0; i < 16; i++)
         u(8, uuid[i], uuid_iso_iec_11578);
 
     snprintf(tmp, sizeof(tmp), "%s / VAAPI %s / %s", lavc, vaapi, driver);
     for (i = 0; i < sizeof(tmp) && tmp[i]; i++)
         u(8, tmp[i], user_data_payload_byte);
 }
 

 static void vaapi_encode_h264_write_sei(PutBitContext *pbc,
                                         VAAPIEncodeContext *ctx,
                                         VAAPIEncodePicture *pic)
 {
     VAAPIEncodeH264Context *priv = ctx->priv_data;
     PutBitContext payload_bits;
     char payload[256];
     int payload_type, payload_size, i;
     void (*write_payload)(PutBitContext *pbc,
                           VAAPIEncodeContext *ctx,
                           VAAPIEncodePicture *pic) = NULL;
 

     vaapi_encode_h264_write_nal_header(pbc, H264_NAL_SEI, 0);

 
     for (payload_type = 0; payload_type < 64; payload_type++) {
         switch (payload_type) {

         case H264_SEI_TYPE_BUFFERING_PERIOD:

             if (!priv->send_timing_sei ||
                 pic->type != PICTURE_TYPE_IDR)
                 continue;
             write_payload = &vaapi_encode_h264_write_buffering_period;
             break;

         case H264_SEI_TYPE_PIC_TIMING:

             if (!priv->send_timing_sei)
                 continue;
             write_payload = &vaapi_encode_h264_write_pic_timing;
             break;

         case H264_SEI_TYPE_USER_DATA_UNREGISTERED:

             if (pic->encode_order != 0)
                 continue;
             write_payload = &vaapi_encode_h264_write_identifier;
             break;

         default:
             continue;
         }
 
         init_put_bits(&payload_bits, payload, sizeof(payload));
         write_payload(&payload_bits, ctx, pic);
         if (put_bits_count(&payload_bits) & 7) {
             write_u(&payload_bits, 1, 1, bit_equal_to_one);
             while (put_bits_count(&payload_bits) & 7)
                 write_u(&payload_bits, 1, 0, bit_equal_to_zero);
         }
         payload_size = put_bits_count(&payload_bits) / 8;
         flush_put_bits(&payload_bits);
 
         u(8, payload_type, last_payload_type_byte);
         u(8, payload_size, last_payload_size_byte);
         for (i = 0; i < payload_size; i++)
             u(8, payload[i] & 0xff, sei_payload);
     }
 
     vaapi_encode_h264_write_trailing_rbsp(pbc);
 }
 

 static int vaapi_encode_h264_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_h264_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_h264_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_h264_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_h264_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_h264_write_extra_header(AVCodecContext *avctx,
                                                 VAAPIEncodePicture *pic,
                                                 int index, int *type,
                                                 char *data, size_t *data_len)
 {
     VAAPIEncodeContext *ctx = avctx->priv_data;
     PutBitContext pbc;
     char tmp[256];
     size_t header_len;
 
     if (index == 0 && ctx->va_rc_mode == VA_RC_CBR) {
         *type = VAEncPackedHeaderH264_SEI;
 
         init_put_bits(&pbc, tmp, sizeof(tmp));
         vaapi_encode_h264_write_sei(&pbc, ctx, pic);
         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);
 
     } else {
         return AVERROR_EOF;
     }
 }
 

 static int vaapi_encode_h264_init_sequence_params(AVCodecContext *avctx)
 {
     VAAPIEncodeContext                 *ctx = avctx->priv_data;
     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
     VAEncPictureParameterBufferH264   *vpic = ctx->codec_picture_params;
     VAAPIEncodeH264Context            *priv = ctx->priv_data;
     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;

     VAAPIEncodeH264Options             *opt =
         (VAAPIEncodeH264Options*)ctx->codec_options_data;

     int i;
 
     {
         vseq->seq_parameter_set_id = 0;
 
         vseq->level_idc = avctx->level;
 

         vseq->max_num_ref_frames = 1 + (avctx->max_b_frames > 0);

 
         vseq->picture_width_in_mbs  = priv->mb_width;
         vseq->picture_height_in_mbs = priv->mb_height;
 
         vseq->seq_fields.bits.chroma_format_idc = 1;
         vseq->seq_fields.bits.frame_mbs_only_flag = 1;
         vseq->seq_fields.bits.direct_8x8_inference_flag = 1;
         vseq->seq_fields.bits.log2_max_frame_num_minus4 = 4;
         vseq->seq_fields.bits.pic_order_cnt_type = 0;

         vseq->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4 =
             av_clip(av_log2(avctx->max_b_frames + 1) - 2, 0, 12);

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

             vseq->frame_cropping_flag = 1;
 
             vseq->frame_crop_left_offset   = 0;
             vseq->frame_crop_right_offset  =

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

             vseq->frame_crop_top_offset    = 0;
             vseq->frame_crop_bottom_offset =

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

         } else {
             vseq->frame_cropping_flag = 0;
         }

         vseq->vui_parameters_present_flag = 1;
         if (avctx->sample_aspect_ratio.num != 0) {
             vseq->vui_fields.bits.aspect_ratio_info_present_flag = 1;
             // There is a large enum of these which we could support
             // individually rather than using the generic X/Y form?
             if (avctx->sample_aspect_ratio.num ==
                 avctx->sample_aspect_ratio.den) {
                 vseq->aspect_ratio_idc = 1;
             } else {
                 vseq->aspect_ratio_idc = 255; // Extended SAR.
                 vseq->sar_width  = avctx->sample_aspect_ratio.num;
                 vseq->sar_height = avctx->sample_aspect_ratio.den;
             }
         }
         if (avctx->color_primaries != AVCOL_PRI_UNSPECIFIED ||
             avctx->color_trc       != AVCOL_TRC_UNSPECIFIED ||
             avctx->colorspace      != AVCOL_SPC_UNSPECIFIED) {
             mseq->video_signal_type_present_flag = 1;
             mseq->video_format             = 5; // Unspecified.
             mseq->video_full_range_flag    = 0;
             mseq->colour_description_present_flag = 1;
             // These enums are derived from the standard and hence
             // we can just use the values directly.
             mseq->colour_primaries         = avctx->color_primaries;
             mseq->transfer_characteristics = avctx->color_trc;
             mseq->matrix_coefficients      = avctx->colorspace;
         }
 

         vseq->vui_fields.bits.bitstream_restriction_flag = 1;
         mseq->motion_vectors_over_pic_boundaries_flag = 1;
         mseq->max_bytes_per_pic_denom = 0;
         mseq->max_bits_per_mb_denom   = 0;
         vseq->vui_fields.bits.log2_max_mv_length_horizontal = 16;
         vseq->vui_fields.bits.log2_max_mv_length_vertical   = 16;
 
         mseq->max_num_reorder_frames = (avctx->max_b_frames > 0);
         mseq->max_dec_pic_buffering  = vseq->max_num_ref_frames;
 

         vseq->bits_per_second = avctx->bit_rate;

 
         vseq->vui_fields.bits.timing_info_present_flag = 1;

         if (avctx->framerate.num > 0 && avctx->framerate.den > 0) {

             vseq->num_units_in_tick = avctx->framerate.den;
             vseq->time_scale        = 2 * avctx->framerate.num;

             mseq->fixed_frame_rate_flag = 1;

         } else {
             vseq->num_units_in_tick = avctx->time_base.num;
             vseq->time_scale        = 2 * avctx->time_base.den;

             mseq->fixed_frame_rate_flag = 0;

         }
 

         if (ctx->va_rc_mode == VA_RC_CBR) {
             priv->send_timing_sei = 1;
             mseq->nal_hrd_parameters_present_flag = 1;
 
             mseq->cpb_cnt_minus1 = 0;
 
             // Try to scale these to a sensible range so that the
             // golomb encode of the value is not overlong.
             mseq->bit_rate_scale =

                 av_clip_uintp2(av_log2(avctx->bit_rate) - 15 - 6, 4);

             mseq->bit_rate_value_minus1[0] =

                 (avctx->bit_rate >> mseq->bit_rate_scale + 6) - 1;

 
             mseq->cpb_size_scale =

                 av_clip_uintp2(av_log2(ctx->hrd_params.hrd.buffer_size) - 15 - 4, 4);

             mseq->cpb_size_value_minus1[0] =

                 (ctx->hrd_params.hrd.buffer_size >> mseq->cpb_size_scale + 4) - 1;

 
             // CBR mode isn't actually available here, despite naming.
             mseq->cbr_flag[0] = 0;
 
             mseq->initial_cpb_removal_delay_length_minus1 = 23;
             mseq->cpb_removal_delay_length_minus1         = 23;
             mseq->dpb_output_delay_length_minus1          = 7;
             mseq->time_offset_length = 0;
 
             // This calculation can easily overflow 32 bits.
             mseq->initial_cpb_removal_delay = 90000 *

                 (uint64_t)ctx->hrd_params.hrd.initial_buffer_fullness /
                 ctx->hrd_params.hrd.buffer_size;

 
             mseq->initial_cpb_removal_delay_offset = 0;
         } else {
             priv->send_timing_sei = 0;
             mseq->nal_hrd_parameters_present_flag = 0;
         }
 

         vseq->intra_period     = avctx->gop_size;
         vseq->intra_idr_period = avctx->gop_size;

         vseq->ip_period        = ctx->b_per_p + 1;

     }
 
     {
         vpic->CurrPic.picture_id = VA_INVALID_ID;
         vpic->CurrPic.flags      = VA_PICTURE_H264_INVALID;
 
         for (i = 0; i < FF_ARRAY_ELEMS(vpic->ReferenceFrames); i++) {
             vpic->ReferenceFrames[i].picture_id = VA_INVALID_ID;
             vpic->ReferenceFrames[i].flags      = VA_PICTURE_H264_INVALID;
         }
 
         vpic->coded_buf = VA_INVALID_ID;
 
         vpic->pic_parameter_set_id = 0;
         vpic->seq_parameter_set_id = 0;
 
         vpic->num_ref_idx_l0_active_minus1 = 0;
         vpic->num_ref_idx_l1_active_minus1 = 0;
 
         vpic->pic_fields.bits.entropy_coding_mode_flag =

             opt->coder ? ((avctx->profile & 0xff) != 66) : 0;

         vpic->pic_fields.bits.weighted_pred_flag = 0;
         vpic->pic_fields.bits.weighted_bipred_idc = 0;
         vpic->pic_fields.bits.transform_8x8_mode_flag =
             ((avctx->profile & 0xff) >= 100);
 
         vpic->pic_init_qp = priv->fixed_qp_idr;
     }
 
     {
         mseq->profile_idc = avctx->profile & 0xff;
 
         if (avctx->profile & FF_PROFILE_H264_CONSTRAINED)
             mseq->constraint_set1_flag = 1;
         if (avctx->profile & FF_PROFILE_H264_INTRA)
             mseq->constraint_set3_flag = 1;
     }
 
     return 0;
 }
 
 static int vaapi_encode_h264_init_picture_params(AVCodecContext *avctx,
                                                  VAAPIEncodePicture *pic)
 {
     VAAPIEncodeContext                *ctx = avctx->priv_data;
     VAEncSequenceParameterBufferH264 *vseq = ctx->codec_sequence_params;
     VAEncPictureParameterBufferH264  *vpic = pic->codec_picture_params;
     VAAPIEncodeH264Context           *priv = ctx->priv_data;
     int i;
 
     if (pic->type == PICTURE_TYPE_IDR) {
         av_assert0(pic->display_order == pic->encode_order);

         vpic->frame_num = 0;
         priv->next_frame_num = 1;

         priv->cpb_delay = 0;

         priv->last_idr_frame = pic->display_order;

     } else {

         vpic->frame_num = priv->next_frame_num;
         if (pic->type != PICTURE_TYPE_B) {
             // nal_ref_idc != 0
             ++priv->next_frame_num;
         }

         ++priv->cpb_delay;

     }

     priv->dpb_delay = pic->display_order - pic->encode_order + 1;

     vpic->frame_num = vpic->frame_num &

         ((1 << (4 + vseq->seq_fields.bits.log2_max_frame_num_minus4)) - 1);
 
     vpic->CurrPic.picture_id          = pic->recon_surface;
     vpic->CurrPic.frame_idx           = vpic->frame_num;
     vpic->CurrPic.flags               = 0;

     vpic->CurrPic.TopFieldOrderCnt    = pic->display_order - priv->last_idr_frame;
     vpic->CurrPic.BottomFieldOrderCnt = pic->display_order - priv->last_idr_frame;

 
     for (i = 0; i < pic->nb_refs; i++) {
         VAAPIEncodePicture *ref = pic->refs[i];

         av_assert0(ref && ref->encode_order < pic->encode_order);

         vpic->ReferenceFrames[i].picture_id = ref->recon_surface;

         vpic->ReferenceFrames[i].frame_idx  = ref->encode_order;

         vpic->ReferenceFrames[i].flags = VA_PICTURE_H264_SHORT_TERM_REFERENCE;

         vpic->ReferenceFrames[i].TopFieldOrderCnt    = ref->display_order - priv->last_idr_frame;
         vpic->ReferenceFrames[i].BottomFieldOrderCnt = ref->display_order - priv->last_idr_frame;

     }
     for (; i < FF_ARRAY_ELEMS(vpic->ReferenceFrames); i++) {
         vpic->ReferenceFrames[i].picture_id = VA_INVALID_ID;
         vpic->ReferenceFrames[i].flags = VA_PICTURE_H264_INVALID;
     }
 
     vpic->coded_buf = pic->output_buffer;
 
     vpic->pic_fields.bits.idr_pic_flag = (pic->type == PICTURE_TYPE_IDR);
     vpic->pic_fields.bits.reference_pic_flag = (pic->type != PICTURE_TYPE_B);
 
     pic->nb_slices = 1;
 
     return 0;
 }
 
 static int vaapi_encode_h264_init_slice_params(AVCodecContext *avctx,
                                                VAAPIEncodePicture *pic,
                                                VAAPIEncodeSlice *slice)
 {
     VAAPIEncodeContext                 *ctx = avctx->priv_data;
     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
     VAEncPictureParameterBufferH264   *vpic = pic->codec_picture_params;
     VAEncSliceParameterBufferH264   *vslice = slice->codec_slice_params;
     VAAPIEncodeH264Context            *priv = ctx->priv_data;
     VAAPIEncodeH264Slice            *pslice;
     VAAPIEncodeH264MiscSliceParams  *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;
 
     if (pic->type == PICTURE_TYPE_IDR)

         mslice->nal_unit_type = H264_NAL_IDR_SLICE;

     else

         mslice->nal_unit_type = H264_NAL_SLICE;

 
     switch (pic->type) {
     case PICTURE_TYPE_IDR:
         vslice->slice_type  = SLICE_TYPE_I;
         mslice->nal_ref_idc = 3;
         break;
     case PICTURE_TYPE_I:
         vslice->slice_type  = SLICE_TYPE_I;
         mslice->nal_ref_idc = 2;
         break;
     case PICTURE_TYPE_P:
         vslice->slice_type  = SLICE_TYPE_P;
         mslice->nal_ref_idc = 1;
         break;
     case PICTURE_TYPE_B:
         vslice->slice_type  = SLICE_TYPE_B;
         mslice->nal_ref_idc = 0;
         break;
     default:
         av_assert0(0 && "invalid picture type");
     }
 
     // Only one slice per frame.
     vslice->macroblock_address = 0;
     vslice->num_macroblocks = priv->mb_width * priv->mb_height;
 
     vslice->macroblock_info = VA_INVALID_ID;
 
     vslice->pic_parameter_set_id = vpic->pic_parameter_set_id;
     vslice->idr_pic_id = priv->idr_pic_count++;
 

     vslice->pic_order_cnt_lsb = (pic->display_order - priv->last_idr_frame) &

         ((1 << (4 + vseq->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4)) - 1);
 
     for (i = 0; i < FF_ARRAY_ELEMS(vslice->RefPicList0); i++) {
         vslice->RefPicList0[i].picture_id = VA_INVALID_ID;
         vslice->RefPicList0[i].flags      = VA_PICTURE_H264_INVALID;
         vslice->RefPicList1[i].picture_id = VA_INVALID_ID;
         vslice->RefPicList1[i].flags      = VA_PICTURE_H264_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->RefPicList0[0] = vpic->ReferenceFrames[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->RefPicList1[0] = vpic->ReferenceFrames[1];
     }
 
     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->direct_spatial_mv_pred_flag = 1;
 
     return 0;
 }
 

 static av_cold int vaapi_encode_h264_configure(AVCodecContext *avctx)

 {
     VAAPIEncodeContext      *ctx = avctx->priv_data;
     VAAPIEncodeH264Context *priv = ctx->priv_data;

     VAAPIEncodeH264Options  *opt = ctx->codec_options;

     priv->mb_width  = FFALIGN(avctx->width,  16) / 16;
     priv->mb_height = FFALIGN(avctx->height, 16) / 16;
 
     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 ||
                ctx->va_rc_mode == VA_RC_VBR) {

         // These still need to be  set for pic_init_qp/slice_qp_delta.
         priv->fixed_qp_idr = 26;
         priv->fixed_qp_p   = 26;
         priv->fixed_qp_b   = 26;
 

         av_log(avctx, AV_LOG_DEBUG, "Using %s-bitrate = %"PRId64" bps.\n",
                ctx->va_rc_mode == VA_RC_CBR ? "constant" : "variable",

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

     if (avctx->compression_level == FF_COMPRESSION_DEFAULT)
         avctx->compression_level = opt->quality;

     return 0;
 }
 

 static const VAAPIEncodeType vaapi_encode_type_h264 = {
     .priv_data_size        = sizeof(VAAPIEncodeH264Context),

     .configure             = &vaapi_encode_h264_configure,

     .sequence_params_size  = sizeof(VAEncSequenceParameterBufferH264),
     .init_sequence_params  = &vaapi_encode_h264_init_sequence_params,
 
     .picture_params_size   = sizeof(VAEncPictureParameterBufferH264),
     .init_picture_params   = &vaapi_encode_h264_init_picture_params,

     .slice_params_size     = sizeof(VAEncSliceParameterBufferH264),
     .init_slice_params     = &vaapi_encode_h264_init_slice_params,
 
     .sequence_header_type  = VAEncPackedHeaderSequence,
     .write_sequence_header = &vaapi_encode_h264_write_sequence_header,
 
     .slice_header_type     = VAEncPackedHeaderH264_Slice,
     .write_slice_header    = &vaapi_encode_h264_write_slice_header,
 
     .write_extra_header    = &vaapi_encode_h264_write_extra_header,
 };
 
 static av_cold int vaapi_encode_h264_init(AVCodecContext *avctx)

 {

     VAAPIEncodeContext     *ctx = avctx->priv_data;
     VAAPIEncodeH264Options *opt =
         (VAAPIEncodeH264Options*)ctx->codec_options_data;

     ctx->codec = &vaapi_encode_type_h264;

 
     switch (avctx->profile) {

     case FF_PROFILE_H264_BASELINE:
         av_log(avctx, AV_LOG_WARNING, "H.264 baseline profile is not "
                "supported, using constrained baseline profile instead.\n");
         avctx->profile = FF_PROFILE_H264_CONSTRAINED_BASELINE;

     case FF_PROFILE_H264_CONSTRAINED_BASELINE:
         ctx->va_profile = VAProfileH264ConstrainedBaseline;

         if (avctx->max_b_frames != 0) {
             avctx->max_b_frames = 0;
             av_log(avctx, AV_LOG_WARNING, "H.264 constrained baseline profile "
                    "doesn't support encoding with B frames, disabling them.\n");
         }

         break;
     case FF_PROFILE_H264_MAIN:
         ctx->va_profile = VAProfileH264Main;
         break;
     case FF_PROFILE_H264_EXTENDED:
         av_log(avctx, AV_LOG_ERROR, "H.264 extended profile "
                "is not supported.\n");
         return AVERROR_PATCHWELCOME;
     case FF_PROFILE_UNKNOWN:
     case FF_PROFILE_H264_HIGH:
         ctx->va_profile = VAProfileH264High;
         break;
     case FF_PROFILE_H264_HIGH_10:
     case FF_PROFILE_H264_HIGH_10_INTRA:
         av_log(avctx, AV_LOG_ERROR, "H.264 10-bit profiles "
                "are not supported.\n");
         return AVERROR_PATCHWELCOME;
     case FF_PROFILE_H264_HIGH_422:
     case FF_PROFILE_H264_HIGH_422_INTRA:
     case FF_PROFILE_H264_HIGH_444:
     case FF_PROFILE_H264_HIGH_444_PREDICTIVE:
     case FF_PROFILE_H264_HIGH_444_INTRA:
     case FF_PROFILE_H264_CAVLC_444:
         av_log(avctx, AV_LOG_ERROR, "H.264 non-4:2:0 profiles "
                "are not supported.\n");
         return AVERROR_PATCHWELCOME;
     default:
         av_log(avctx, AV_LOG_ERROR, "Unknown H.264 profile %d.\n",
                avctx->profile);
         return AVERROR(EINVAL);
     }

     if (opt->low_power) {

 #if VA_CHECK_VERSION(0, 39, 2)

         ctx->va_entrypoint = VAEntrypointEncSliceLP;
 #else
         av_log(avctx, AV_LOG_ERROR, "Low-power encoding is not "
                "supported with this VAAPI version.\n");
         return AVERROR(EINVAL);
 #endif
     } else {
         ctx->va_entrypoint = VAEntrypointEncSlice;
     }

     // Only 8-bit encode is supported.
     ctx->va_rt_format = VA_RT_FORMAT_YUV420;

     if (avctx->bit_rate > 0) {
         if (avctx->rc_max_rate == avctx->bit_rate)
             ctx->va_rc_mode = VA_RC_CBR;
         else
             ctx->va_rc_mode = VA_RC_VBR;
     } else

         ctx->va_rc_mode = VA_RC_CQP;

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

     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(VAAPIEncodeH264Options, x))
 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
 static const AVOption vaapi_encode_h264_options[] = {

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

       OFFSET(qp), AV_OPT_TYPE_INT, { .i64 = 20 }, 0, 52, FLAGS },

     { "quality", "Set encode quality (trades off against speed, higher is faster)",

       OFFSET(quality), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 8, FLAGS },
     { "low_power", "Use low-power encoding mode (experimental: only supported "
       "on some platforms, does not support all features)",
       OFFSET(low_power), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },

     { "coder", "Entropy coder type",
       OFFSET(coder), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS, "coder" },
         { "cavlc", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS, "coder" },
         { "cabac", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, FLAGS, "coder" },
         { "vlc",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS, "coder" },
         { "ac",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, FLAGS, "coder" },

     { NULL },
 };
 

 static const AVCodecDefault vaapi_encode_h264_defaults[] = {
     { "profile",        "100" },
     { "level",          "51"  },
     { "b",              "0"   },
     { "bf",             "2"   },
     { "g",              "120" },

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

     { "qmin",           "0"   },

     { NULL },
 };
 
 static const AVClass vaapi_encode_h264_class = {
     .class_name = "h264_vaapi",
     .item_name  = av_default_item_name,

     .option     = vaapi_encode_h264_options,

     .version    = LIBAVUTIL_VERSION_INT,
 };
 
 AVCodec ff_h264_vaapi_encoder = {
     .name           = "h264_vaapi",
     .long_name      = NULL_IF_CONFIG_SMALL("H.264/AVC (VAAPI)"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_H264,

     .priv_data_size = (sizeof(VAAPIEncodeContext) +
                        sizeof(VAAPIEncodeH264Options)),

     .init           = &vaapi_encode_h264_init,
     .encode2        = &ff_vaapi_encode2,
     .close          = &ff_vaapi_encode_close,
     .priv_class     = &vaapi_encode_h264_class,
     .capabilities   = AV_CODEC_CAP_DELAY,
     .defaults       = vaapi_encode_h264_defaults,
     .pix_fmts = (const enum AVPixelFormat[]) {
         AV_PIX_FMT_VAAPI,
         AV_PIX_FMT_NONE,
     },
 };