lavc: VAAPI H.265 encoder
authorMark Thompson <sw@jkqxz.net>
Wed, 23 Mar 2016 23:50:04 +0000 (23:50 +0000)
committerAnton Khirnov <anton@khirnov.net>
Wed, 30 Mar 2016 07:11:25 +0000 (09:11 +0200)
Signed-off-by: Anton Khirnov <anton@khirnov.net>
Changelog
configure
libavcodec/Makefile
libavcodec/allcodecs.c
libavcodec/vaapi_encode_h265.c [new file with mode: 0644]

index 76ac32a..e0f42b6 100644 (file)
--- a/Changelog
+++ b/Changelog
@@ -53,7 +53,7 @@ version <next>:
 - compressed SWF
 - VAAPI-accelerated format conversion and scaling
 - libnpp/CUDA-accelerated format conversion and scaling
-- VAAPI-accelerate H.264 encoding
+- VAAPI-accelerate H.264/HEVC encoding
 
 
 version 11:
index 46f34e4..3a3b059 100755 (executable)
--- a/configure
+++ b/configure
@@ -1967,6 +1967,8 @@ hevc_qsv_encoder_deps="libmfx"
 hevc_qsv_decoder_deps="libmfx"
 hevc_qsv_decoder_select="hevc_mp4toannexb_bsf hevc_parser qsvdec hevc_qsv_hwaccel"
 hevc_qsv_encoder_select="qsvenc"
+hevc_vaapi_encoder_deps="VAEncPictureParameterBufferHEVC"
+hevc_vaapi_encoder_select="vaapi_encode golomb"
 huffyuv_decoder_select="bswapdsp huffyuvdsp"
 huffyuv_encoder_select="bswapdsp huffman huffyuvencdsp"
 iac_decoder_select="imc_decoder"
@@ -4470,6 +4472,7 @@ check_type "d3d9.h dxva2api.h" DXVA2_ConfigPictureDecode -D_WIN32_WINNT=0x0602
 
 check_type "va/va.h va/va_vpp.h" "VAProcPipelineParameterBuffer"
 check_type "va/va.h va/va_enc_h264.h" "VAEncPictureParameterBufferH264"
+check_type "va/va.h va/va_enc_hevc.h" "VAEncPictureParameterBufferHEVC"
 
 check_type "vdpau/vdpau.h" "VdpPictureInfoHEVC"
 
index 1562339..d614a67 100644 (file)
@@ -268,6 +268,7 @@ OBJS-$(CONFIG_HEVC_DECODER)            += hevc.o hevc_mvs.o hevc_ps.o hevc_sei.o
 OBJS-$(CONFIG_HEVC_NVENC_ENCODER)      += nvenc_hevc.o
 OBJS-$(CONFIG_HEVC_QSV_DECODER)        += qsvdec_h2645.o
 OBJS-$(CONFIG_HEVC_QSV_ENCODER)        += qsvenc_hevc.o hevc_ps_enc.o h2645_parse.o
+OBJS-$(CONFIG_HEVC_VAAPI_ENCODER)      += vaapi_encode_h265.o vaapi_encode_h26x.o
 OBJS-$(CONFIG_HNM4_VIDEO_DECODER)      += hnm4video.o
 OBJS-$(CONFIG_HQ_HQA_DECODER)          += hq_hqa.o hq_hqadata.o hq_hqadsp.o \
                                           canopus.o
index 4d3eaa1..b37b31d 100644 (file)
@@ -170,6 +170,7 @@ void avcodec_register_all(void)
     REGISTER_ENCDEC (HAP,               hap);
     REGISTER_DECODER(HEVC,              hevc);
     REGISTER_DECODER(HEVC_QSV,          hevc_qsv);
+    REGISTER_ENCODER(HEVC_VAAPI,        hevc_vaapi);
     REGISTER_DECODER(HNM4_VIDEO,        hnm4_video);
     REGISTER_DECODER(HQ_HQA,            hq_hqa);
     REGISTER_DECODER(HQX,               hqx);
diff --git a/libavcodec/vaapi_encode_h265.c b/libavcodec/vaapi_encode_h265.c
new file mode 100644 (file)
index 0000000..0aa40e3
--- /dev/null
@@ -0,0 +1,1257 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; 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;
+} VAAPIEncodeH265Context;
+
+
+#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, 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, 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, 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 >= 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 != NAL_IDR_W_RADL &&
+           vpic->nal_unit_type != 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 == P_SLICE || vslice->slice_type == B_SLICE) {
+                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 == B_SLICE) {
+                        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 == B_SLICE) {
+                    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 == B_SLICE)
+                        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 == P_SLICE) ||
+                    (vpic->pic_fields.bits.weighted_bipred_flag &&
+                     vslice->slice_type == B_SLICE)) {
+                    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->aligned_width;
+        vseq->pic_height_in_luma_samples = ctx->aligned_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 = 0; // 8-bit luma.
+        vseq->seq_fields.bits.bit_depth_chroma_minus8 = 0; // 8-bit chroma.
+        // 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;
+    }
+
+    {
+        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;
+
+        //vpic->pic_fields.bits.cu_qp_delta_enabled_flag = 1;
+    }
+
+    {
+        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] = 1;
+        mseq->vps_max_num_reorder_pics[0]         = ctx->b_per_p;
+        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] = 1;
+        mseq->sps_max_num_reorder_pics[0]         = ctx->b_per_p;
+        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 (ctx->input_width  != ctx->aligned_width ||
+            ctx->input_height != ctx->aligned_height) {
+            mseq->conformance_window_flag = 1;
+            mseq->conf_win_left_offset   = 0;
+            mseq->conf_win_right_offset  =
+                (ctx->aligned_width - ctx->input_width) / 2;
+            mseq->conf_win_top_offset    = 0;
+            mseq->conf_win_bottom_offset =
+                (ctx->aligned_height - ctx->input_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 = 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 = 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 = 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 = 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 = I_SLICE;
+        break;
+    case PICTURE_TYPE_P:
+        vslice->slice_type = P_SLICE;
+        break;
+    case PICTURE_TYPE_B:
+        vslice->slice_type = B_SLICE;
+        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 VAConfigAttrib vaapi_encode_h265_config_attributes[] = {
+    { .type  = VAConfigAttribRTFormat,
+      .value = VA_RT_FORMAT_YUV420 },
+    { .type  = VAConfigAttribRateControl,
+      .value = VA_RC_CQP },
+    { .type  = VAConfigAttribEncPackedHeaders,
+      .value = (VA_ENC_PACKED_HEADER_SEQUENCE |
+                VA_ENC_PACKED_HEADER_SLICE) },
+};
+
+static av_cold int vaapi_encode_h265_init_internal(AVCodecContext *avctx)
+{
+    VAAPIEncodeContext      *ctx = avctx->priv_data;
+    VAAPIEncodeH265Context *priv = ctx->priv_data;
+
+    switch (avctx->profile) {
+    case FF_PROFILE_HEVC_MAIN:
+    case FF_PROFILE_UNKNOWN:
+        ctx->va_profile = VAProfileHEVCMain;
+        break;
+    case FF_PROFILE_HEVC_MAIN_10:
+        av_log(avctx, AV_LOG_ERROR, "H.265 main 10-bit profile "
+               "is not supported.\n");
+        return AVERROR_PATCHWELCOME;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "Unknown H.265 profile %d.\n",
+               avctx->profile);
+        return AVERROR(EINVAL);
+    }
+    ctx->va_entrypoint = VAEntrypointEncSlice;
+
+    ctx->va_rc_mode  = VA_RC_CQP;
+
+    ctx->input_width    = avctx->width;
+    ctx->input_height   = avctx->height;
+    ctx->aligned_width  = FFALIGN(ctx->input_width,  16);
+    ctx->aligned_height = FFALIGN(ctx->input_height, 16);
+    priv->ctu_width     = FFALIGN(ctx->aligned_width,  32) / 32;
+    priv->ctu_height    = FFALIGN(ctx->aligned_height, 32) / 32;
+
+    av_log(avctx, AV_LOG_VERBOSE, "Input %ux%u -> Aligned %ux%u -> CTU %ux%u.\n",
+           ctx->input_width, ctx->input_height, ctx->aligned_width,
+           ctx->aligned_height, priv->ctu_width, priv->ctu_height);
+
+    priv->fixed_qp_p = avctx->global_quality;
+    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, "QP = %d / %d / %d for IDR / P / B frames.\n",
+           priv->fixed_qp_idr, priv->fixed_qp_p, priv->fixed_qp_b);
+
+    ctx->config_attributes = vaapi_encode_h265_config_attributes;
+    ctx->nb_config_attributes =
+        FF_ARRAY_ELEMS(vaapi_encode_h265_config_attributes);
+
+    ctx->nb_recon_frames = 20;
+
+    return 0;
+}
+
+static VAAPIEncodeType vaapi_encode_type_h265 = {
+    .priv_data_size        = sizeof(VAAPIEncodeH265Context),
+
+    .init                  = &vaapi_encode_h265_init_internal,
+
+    .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)
+{
+    return ff_vaapi_encode_init(avctx, &vaapi_encode_type_h265);
+}
+
+static const AVCodecDefault vaapi_encode_h265_defaults[] = {
+    { "profile",        "1"   },
+    { "level",          "51"  },
+    { "b",              "0"   },
+    { "bf",             "2"   },
+    { "g",              "120" },
+    { "global_quality", "25"  },
+    { "i_qfactor",      "1.0" },
+    { "i_qoffset",      "0.0" },
+    { "b_qfactor",      "1.2" },
+    { "b_qoffset",      "0.0" },
+    { NULL },
+};
+
+static const AVClass vaapi_encode_h265_class = {
+    .class_name = "h265_vaapi",
+    .item_name  = av_default_item_name,
+    .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),
+    .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,
+    },
+};