/*
 * Copyright (c) 2007-2014 Intel Corporation. All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL INTEL AND/OR ITS SUPPLIERS BE LIABLE FOR
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 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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/**
 * \file va_enc_hevc.h
 * \brief The HEVC encoding API
 *
 * This file contains the \ref api_enc_hevc "HEVC encoding API".
 *
 */

#ifndef VA_ENC_HEVC_H
#define VA_ENC_HEVC_H

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>

/**
 * \defgroup api_enc_hevc HEVC encoding API
 *
 * @{
 */

/** Attribute value for VAConfigAttribEncHEVCFeatures.
 *
 * This attribute decribes the supported features of an HEVC/H.265
 * encoder configuration.
 *
 * All of the field values in this attribute are VA_FEATURE_* values,
 * indicating support for the corresponding feature.
 */
typedef union VAConfigAttribValEncHEVCFeatures {
    struct {
        /** Separate colour planes.
         *
         * Allows setting separate_colour_plane_flag in the SPS.
         */
        uint32_t separate_colour_planes     : 2;
        /** Scaling lists.
         *
         * Allows scaling_list() elements to be present in both the SPS
         * and the PPS.  The decoded form of the scaling lists must also
         * be supplied in a VAQMatrixBufferHEVC buffer when scaling lists
         * are enabled.
         */
        uint32_t scaling_lists              : 2;
        /** Asymmetric motion partitions.
         *
         * Allows setting amp_enabled_flag in the SPS.
         */
        uint32_t amp                        : 2;
        /** Sample adaptive offset filter.
         *
         * Allows setting slice_sao_luma_flag and slice_sao_chroma_flag
         * in slice headers.
         */
        uint32_t sao                        : 2;
        /** PCM sample blocks.
         *
         * Allows setting pcm_enabled_flag in the SPS.  When enabled
         * PCM parameters must be supplied with the sequence parameters,
         * including block sizes which may be further constrained as
         * noted in the VAConfigAttribEncHEVCBlockSizes attribute.
         */
        uint32_t pcm                        : 2;
        /** Temporal motion vector Prediction.
         *
         * Allows setting slice_temporal_mvp_enabled_flag in slice
         * headers.
         */
        uint32_t temporal_mvp               : 2;
        /** Strong intra smoothing.
         *
         * Allows setting strong_intra_smoothing_enabled_flag in the SPS.
         */
        uint32_t strong_intra_smoothing     : 2;
        /** Dependent slices.
         *
         * Allows setting dependent_slice_segment_flag in slice headers.
         */
        uint32_t dependent_slices           : 2;
        /** Sign data hiding.
         *
         * Allows setting sign_data_hiding_enable_flag in the PPS.
         */
        uint32_t sign_data_hiding           : 2;
        /** Constrained intra prediction.
         *
         * Allows setting constrained_intra_pred_flag in the PPS.
         */
        uint32_t constrained_intra_pred     : 2;
        /** Transform skipping.
         *
         * Allows setting transform_skip_enabled_flag in the PPS.
         */
        uint32_t transform_skip             : 2;
        /** QP delta within coding units.
         *
         * Allows setting cu_qp_delta_enabled_flag in the PPS.
         */
        uint32_t cu_qp_delta                : 2;
        /** Weighted prediction.
         *
         * Allows setting weighted_pred_flag and weighted_bipred_flag in
         * the PPS.  The pred_weight_table() data must be supplied with
         * every slice header when weighted prediction is enabled.
         */
        uint32_t weighted_prediction        : 2;
        /** Transform and quantisation bypass.
         *
         * Allows setting transquant_bypass_enabled_flag in the PPS.
         */
        uint32_t transquant_bypass          : 2;
        /** Deblocking filter disable.
         *
         * Allows setting slice_deblocking_filter_disabled_flag.
         */
        uint32_t deblocking_filter_disable  : 2;
        /* Reserved,should not be used, avoid conflict with VA_ATTRIB_NOT_SUPPORTED. */
        uint32_t reserved                   : 2;
    } bits;
    uint32_t value;
} VAConfigAttribValEncHEVCFeatures;

/** Attribute value for VAConfigAttribEncHEVCBlockSizes.
 *
 * This attribute describes the supported coding tree and transform block
 * sizes of an HEVC/H.265 encoder configuration
 */
typedef union VAConfigAttribValEncHEVCBlockSizes {
    struct {
        /** Largest supported size of coding tree blocks.
         *
         * CtbLog2SizeY must not be larger than this.
         */
        uint32_t log2_max_coding_tree_block_size_minus3    : 2;
        /** Smallest supported size of coding tree blocks.
         *
         * CtbLog2SizeY must not be smaller than this.
         *
         * This may be the same as the maximum size, indicating that only
         * one CTB size is supported.
         */
        uint32_t log2_min_coding_tree_block_size_minus3    : 2;

        /** Smallest supported size of luma coding blocks.
         *
         * MinCbLog2SizeY must not be smaller than this.
         */
        uint32_t log2_min_luma_coding_block_size_minus3    : 2;

        /** Largest supported size of luma transform blocks.
         *
         * MaxTbLog2SizeY must not be larger than this.
         */
        uint32_t log2_max_luma_transform_block_size_minus2 : 2;
        /** Smallest supported size of luma transform blocks.
         *
         * MinTbLog2SizeY must not be smaller than this.
         */
        uint32_t log2_min_luma_transform_block_size_minus2 : 2;

        /** Largest supported transform hierarchy depth in inter
         *  coding units.
         *
         * max_transform_hierarchy_depth_inter must not be larger
         * than this.
         */
        uint32_t max_max_transform_hierarchy_depth_inter   : 2;
        /** Smallest supported transform hierarchy depth in inter
         *  coding units.
         *
         * max_transform_hierarchy_depth_inter must not be smaller
         * than this.
         */
        uint32_t min_max_transform_hierarchy_depth_inter   : 2;

        /** Largest supported transform hierarchy depth in intra
         *  coding units.
         *
         * max_transform_hierarchy_depth_intra must not be larger
         * than this.
         */
        uint32_t max_max_transform_hierarchy_depth_intra   : 2;
        /** Smallest supported transform hierarchy depth in intra
         *  coding units.
         *
         * max_transform_hierarchy_depth_intra must not be smaller
         * than this.
         */
        uint32_t min_max_transform_hierarchy_depth_intra   : 2;

        /** Largest supported size of PCM coding blocks.
         *
         *  Log2MaxIpcmCbSizeY must not be larger than this.
         */
        uint32_t log2_max_pcm_coding_block_size_minus3     : 2;
        /** Smallest supported size of PCM coding blocks.
         *
         *  Log2MinIpcmCbSizeY must not be smaller than this.
         */
        uint32_t log2_min_pcm_coding_block_size_minus3     : 2;

        /** Reserved for future use. */
        uint32_t reserved                                  : 10;
    } bits;
    uint32_t value;
} VAConfigAttribValEncHEVCBlockSizes;

/**
 * @name Picture flags
 *
 * Those flags flags are meant to signal when a picture marks the end
 * of a sequence, a stream, or even both at once.
 *
 * @{
 */
/**
 * \brief Marks the last picture in the sequence.
 *
 * i.e. the driver appends \c end_of_seq() NAL unit to the encoded frame.
 */
#define HEVC_LAST_PICTURE_EOSEQ     0x01
/**
 * \brief Marks the last picture in the stream.
 *
 * i.e. the driver appends \c end_of_stream() NAL unit to the encoded frame.
 */
#define HEVC_LAST_PICTURE_EOSTREAM  0x02
/**@}*/

/**
 * \brief Packed header types specific to HEVC encoding.
 *
 * Types of packed headers generally used for HEVC encoding. Each
 * associated packed header data buffer shall contain the start code
 * prefix 0x000001 followed by the complete NAL unit, thus also
 * including the \c nal_unit_type.
 *
 * Note: the start code prefix can contain an arbitrary number of leading
 * zeros. The driver will skip them for emulation prevention bytes insertion,
 * if necessary.
 */
typedef enum {
    /**
     * \brief Packed Video Parameter Set (VPS).
     *
     * The corresponding packed header data buffer shall contain the
     * complete video_parameter_set_rbsp() syntax element.
     *
     * Note: packed \c nal_unit_type shall be equal to 32.
     */
    VAEncPackedHeaderHEVC_VPS   = VAEncPackedHeaderSequence,
    /**
     * \brief Packed Sequence Parameter Set (SPS).
     *
     * The corresponding packed header data buffer shall contain the
     * complete seq_parameter_set_rbsp() syntax element.
     *
     * Note: packed \c nal_unit_type shall be equal to 33.
     */
    VAEncPackedHeaderHEVC_SPS   = VAEncPackedHeaderSequence,
    /**
     * \brief Packed Picture Parameter Set (PPS).
     *
     * The corresponding packed header data buffer shall contain the
     * complete pic_parameter_set_rbsp() syntax element.
     *
     * Note: packed \c nal_unit_type shall be equal to 34.
     */
    VAEncPackedHeaderHEVC_PPS   = VAEncPackedHeaderPicture,
    /**
     * \brief Packed slice header.
     *
     * The corresponding packed header data buffer shall contain the
     * \c slice_header() syntax element only, along with any start
     * code prefix and NAL unit type preceeding it. i.e. this means
     * that the buffer does not contain any of the \c slice_data() or
     * the \c rbsp_slice_trailing_bits().
     *
     * Note: packed \c nal_unit_type shall be equal to 0 to 9 (non-IRAP
     * picture), or 16 to 21 (IRAP picture).
     */
    VAEncPackedHeaderHEVC_Slice = VAEncPackedHeaderSlice,
    /**
     * \brief Packed Supplemental Enhancement Information (SEI).
     *
     * The corresponding packed header data buffer shall contain the
     * complete sei_rbsp() syntax element, thus including several
     * sei_message() elements if necessary.
     *
     * Note: packed \c nal_unit_type shall be equal to 39 or 40.
     *
     * @deprecated
     * This is a deprecated packed header flag, All applications can use
     * \c VA_ENC_PACKED_HEADER_RAW_DATA to pass the corresponding packed
     * SEI header data buffer to the driver
     */
    VAEncPackedHeaderHEVC_SEI  va_deprecated_enum = (0x80000000 | 1),
} VAEncPackedHeaderTypeHEVC;

/**
 * \brief Sequence parameter for HEVC encoding in main & main 10
 * profiles.
 *
 * This structure holds information for \c seq_parameter_set_data() as
 * defined by the HEVC specification.
 *
 * If packed sequence headers mode is used, i.e. if the encoding
 * pipeline was configured with the #VA_ENC_PACKED_HEADER_SEQUENCE
 * flag, then the driver expects two more buffers to be provided to
 * the same \c vaRenderPicture() as this buffer:
 * - a #VAEncPackedHeaderParameterBuffer with type set to
 *   VAEncPackedHeaderType::VAEncPackedHeaderSequence ;
 * - a #VAEncPackedHeaderDataBuffer which holds the actual packed
 *   header data.
 *
 * If \c seq_scaling_matrix_present_flag is set to \c 1, then a
 * #VAQMatrixBufferHEVC buffer shall also be provided within the same
 * \c vaRenderPicture() call as this sequence parameter buffer.
 */
typedef struct _VAEncSequenceParameterBufferHEVC {
    /** \brief Same as the HEVC bitstream syntax element.
     *  value range [1..2].
     */
    uint8_t     general_profile_idc;
    /** \brief Same as the HEVC bitstream syntax element.
     *  general_level_idc shall be set equal to a value of 30 times the level
     *  numbers allowed [1, 2, 2.1, 3, 3.1, 4, 4.1, 5, 5.1, 5.2, 6, 6.1, 6.2]
     */
    uint8_t     general_level_idc;
    /** \brief Same as the HEVC bitstream syntax element.
     *  Only value 0 is allowed for level value below 4, exclusive.
     */
    uint8_t     general_tier_flag;
    /** \brief Period between I frames. */
    uint32_t    intra_period;
    /** \brief Period between IDR frames. */
    uint32_t    intra_idr_period;
    /** \brief Period between I/P frames. */
    uint32_t    ip_period;
    /**
     * \brief Initial bitrate set for this sequence in CBR or VBR modes.
     *
     * This field represents the initial bitrate value for this
     * sequence if CBR or VBR mode is used, i.e. if the encoder
     * pipeline was created with a #VAConfigAttribRateControl
     * attribute set to either \ref VA_RC_CBR or \ref VA_RC_VBR.
     *
     * The bitrate can be modified later on through
     * #VAEncMiscParameterRateControl buffers.
     */
    uint32_t    bits_per_second;
    /** \brief Picture width in pixel samples.
     *  Its value must be multiple of min CU size.
     */
    uint16_t    pic_width_in_luma_samples;
    /** \brief Picture height in pixel samples.
     *  Its value must be multiple of min CU size.
     */
    uint16_t    pic_height_in_luma_samples;

    union {
        struct {
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    chroma_format_idc                              : 2;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    separate_colour_plane_flag                     : 1;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    bit_depth_luma_minus8                          : 3;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    bit_depth_chroma_minus8                        : 3;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    scaling_list_enabled_flag                      : 1;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    strong_intra_smoothing_enabled_flag            : 1;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    amp_enabled_flag                               : 1;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    sample_adaptive_offset_enabled_flag            : 1;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    pcm_enabled_flag                               : 1;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    pcm_loop_filter_disabled_flag                  : 1;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    sps_temporal_mvp_enabled_flag                  : 1;
            /** \brief Indicates whether or not the encoding is in low delay mode.
              * 0 normal sequence
              * 1 no random access B will be coded . and the coding type could be only I, P or LDB
              * this flag only indicates the frame coding type of the sequence.
              */
            uint32_t    low_delay_seq                                  : 1;
            /** \brief Indicates whether or not the encoding is in dyadic hierarchical GOP structure
              * the default value 0, BRC would treat is as flat structure. if HierachicalFlag == 1,
              * application would enable Qp Modulation
              */
            uint32_t    hierachical_flag                               : 1;
            /** \brief keep for future , should be set to 0 */
            uint32_t    reserved_bits                                  : 14;
        } bits;
        uint32_t value;
    } seq_fields;

    /** \brief Same as the HEVC bitstream syntax element.
     *  value range [0..3]
     */
    uint8_t     log2_min_luma_coding_block_size_minus3;

    /** \brief Same as the HEVC bitstream syntax element.
     */
    uint8_t     log2_diff_max_min_luma_coding_block_size;

    /** \brief Same as the HEVC bitstream syntax element.
     *  value range [0..3]
     */
    uint8_t     log2_min_transform_block_size_minus2;

    /** \brief Same as the HEVC bitstream syntax element.
     */
    uint8_t     log2_diff_max_min_transform_block_size;

    /** \brief Same as the HEVC bitstream syntax element.
     *  value range [2]
     */
    uint8_t     max_transform_hierarchy_depth_inter;

    /** \brief Same as the HEVC bitstream syntax element.
     *  value range [2]
     */
    uint8_t     max_transform_hierarchy_depth_intra;

    /** \brief Same as the HEVC bitstream syntax element. */
    uint32_t    pcm_sample_bit_depth_luma_minus1;

    /** \brief Same as the HEVC bitstream syntax element. */
    uint32_t    pcm_sample_bit_depth_chroma_minus1;

    /** \brief Same as the HEVC bitstream syntax element. */
    uint32_t    log2_min_pcm_luma_coding_block_size_minus3;

    /** \brief Derived from the HEVC bitstream syntax element.
    *  log2_min_pcm_luma_coding_block_size_minus3 +
    *  log2_diff_max_min_pcm_luma_coding_block_size
    */
    uint32_t    log2_max_pcm_luma_coding_block_size_minus3;

    /** @name VUI parameters (optional) */
    /**@{*/
    /** \brief Same as the HEVC bitstream syntax element. */
    uint8_t     vui_parameters_present_flag;
    union {
        struct {
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    aspect_ratio_info_present_flag                 : 1;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    neutral_chroma_indication_flag                 : 1;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    field_seq_flag                                 : 1;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    vui_timing_info_present_flag                   : 1;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    bitstream_restriction_flag                     : 1;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    tiles_fixed_structure_flag                     : 1;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    motion_vectors_over_pic_boundaries_flag        : 1;
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    restricted_ref_pic_lists_flag                  : 1;
            /** \brief Range: 0 to 16, inclusive. */
            uint32_t    log2_max_mv_length_horizontal                  : 5;
            /** \brief Range: 0 to 16, inclusive. */
            uint32_t    log2_max_mv_length_vertical                    : 5;
        } bits;
        uint32_t value;
    } vui_fields;
    /** \brief Same as the HEVC bitstream syntax element. */
    uint8_t     aspect_ratio_idc;
    /** \brief Same as the HEVC bitstream syntax element. */
    uint32_t    sar_width;
    /** \brief Same as the HEVC bitstream syntax element. */
    uint32_t    sar_height;
    /** \brief Same as the HEVC bitstream syntax element. */
    uint32_t    vui_num_units_in_tick;
    /** \brief Same as the HEVC bitstream syntax element. */
    uint32_t    vui_time_scale;
    /** \brief Same as the HEVC bitstream syntax element. */
    uint16_t    min_spatial_segmentation_idc;
    /** \brief Same as the HEVC bitstream syntax element. */
    uint8_t     max_bytes_per_pic_denom;
    /** \brief Same as the HEVC bitstream syntax element. */
    uint8_t     max_bits_per_min_cu_denom;

    /** \brief SCC flags to enable/disable features, including IBC and palette mode at present.*/
    union {
        struct {
            /** \brief Same as the HEVC bitstream syntax element. */
            uint32_t    palette_mode_enabled_flag                      : 1;
            /** \brief Reserved bits for future use, must be zero */
            uint32_t    reserved                                       : 31;
        } bits;
        uint32_t value;
    } scc_fields;
    /** \brief Reserved bytes for future use, must be zero */
    uint32_t   va_reserved[VA_PADDING_MEDIUM - 1];
    /**@}*/
} VAEncSequenceParameterBufferHEVC;

/****************************
 * HEVC data structures
 ****************************/
/**
 * \brief Picture parameter for HEVC encoding in main & main 10
 * profiles.
 *
 * This structure holds information for \c pic_parameter_set_rbsp() as
 * defined by the HEVC specification.
 *
 * If packed picture headers mode is used, i.e. if the encoding
 * pipeline was configured with the #VA_ENC_PACKED_HEADER_PICTURE
 * flag, then the driver expects two more buffers to be provided to
 * the same \c vaRenderPicture() as this buffer:
 * - a #VAEncPackedHeaderParameterBuffer with type set to
 *   VAEncPackedHeaderType::VAEncPackedHeaderPicture ;
 * - a #VAEncPackedHeaderDataBuffer which holds the actual packed
 *   header data.
 *
 * If \c pic_scaling_matrix_present_flag is set to \c 1, then a
 * #VAQMatrixBufferHEVC buffer shall also be provided within the same
 * \c vaRenderPicture() call as this picture parameter buffer.
 */
typedef struct _VAEncPictureParameterBufferHEVC {
    /**
     * \brief Information about the picture to be encoded.
     *
     * See #VAPictureHEVC for further description of each field.
     * Note that decoded_curr_pic.picture_id represents the reconstructed
     * (decoded) picture. User provides a scratch VA surface ID here.
     * Long term reference and RPS related fields should be set to 0
     * and ignored.
     */
    VAPictureHEVC   decoded_curr_pic;
    /**
     * \brief Decoded Picture Buffer (DPB).
     *
     * This array represents the list of reconstructed (decoded)
     * frames used as reference. It is important to keep track of
     * reconstructed frames so that they can be used later on as
     * reference for P or B-frames encoding.
     */
    VAPictureHEVC   reference_frames[15];
    /**
     * \brief Output encoded bitstream.
     *
     * \ref coded_buf has type #VAEncCodedBufferType. It should be
     * large enough to hold the compressed NAL slice and possibly VPS, SPS
     * and PPS NAL units, and other NAL units such as SEI.
     */
    VABufferID      coded_buf;

    /** \brief collocated reference picture buffer index of ReferenceFrames[].
     * Please note it is different from HEVC syntac element collocated_ref_idx.
     * When  the HEVC syntax element slice_temporal_mvp_enable_flag takes value 0,
     * collocated_ref_pic_index should take value 0xFF. .
     * Range: [0..14, 0xFF]
     */
    uint8_t         collocated_ref_pic_index;

    /**
     * \brief OR'd flags describing whether the picture is the last one or not.
     *
     * This fields holds 0 if the picture to be encoded is not the last
     * one in the stream or sequence. Otherwise, it is a combination of
     * \ref HEVC_LAST_PICTURE_EOSEQ or \ref HEVC_LAST_PICTURE_EOSTREAM.
     */
    uint8_t         last_picture;

    /** \brief \c init_qp_minus26 + 26. */
    uint8_t         pic_init_qp;

    /** \brief Corresponds to HEVC syntax element of the same name. */
    uint8_t         diff_cu_qp_delta_depth;

    /** \brief Corresponds to HEVC syntax element of the same name. */
    int8_t          pps_cb_qp_offset;

    /** \brief Corresponds to HEVC syntax element of the same name. */
    int8_t          pps_cr_qp_offset;

    /** \brief Corresponds to HEVC syntax element of the same name. */
    uint8_t         num_tile_columns_minus1;

    /** \brief Corresponds to HEVC syntax element of the same name. */
    uint8_t         num_tile_rows_minus1;

    /** \brief Corresponds to HEVC syntax element of the same name. */
    uint8_t         column_width_minus1[19];

    /** \brief Corresponds to HEVC syntax element of the same name. */
    uint8_t         row_height_minus1[21];

    /** \brief Corresponds to HEVC syntax element of the same name. */
    uint8_t         log2_parallel_merge_level_minus2;

    /** \brief Application may set the CTU bit size limit based on
     *  spec requirement (A.3.2), or other value for special purpose.
     *  If the value is set 0, no bit size limit is checked.
     */
    uint8_t         ctu_max_bitsize_allowed;

    /** \brief Maximum reference index for reference picture list 0.
     *   value range: [0..14].
     */
    uint8_t         num_ref_idx_l0_default_active_minus1;

    /** \brief Maximum reference index for reference picture list 1.
     *  value range: [0..14].
     */
    uint8_t         num_ref_idx_l1_default_active_minus1;

    /** \brief PPS header
     *  Used by GPU to generate new slice headers in slice size control.
     *  value range: [0..63].
     */
    uint8_t         slice_pic_parameter_set_id;

    /** \brief NAL unit type
     *  Used by GPU to generate new slice headers in slice size control.
     *  value range: [0..63].
     */
    uint8_t         nal_unit_type;

    union {
        struct {
            /** \brief Is picture an IDR picture? */
            uint32_t    idr_pic_flag                                   : 1;
            /** \brief Picture type.
             *  I  - 1;
             *  P  - 2;
             *  B  - 3;
             *  B1 - 4;
             *  B2 - 5;
             * B1 and B2 are frame types for hierachical B, explanation
             * can refer to num_b_in_gop[].
             */
            uint32_t    coding_type                                    : 3;
            /** \brief Is picture a reference picture? */
            uint32_t    reference_pic_flag                             : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    dependent_slice_segments_enabled_flag          : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    sign_data_hiding_enabled_flag                  : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    constrained_intra_pred_flag                    : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    transform_skip_enabled_flag                    : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    cu_qp_delta_enabled_flag                   : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    weighted_pred_flag                             : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    weighted_bipred_flag                           : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    transquant_bypass_enabled_flag                 : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    tiles_enabled_flag                             : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    entropy_coding_sync_enabled_flag               : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    loop_filter_across_tiles_enabled_flag          : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    pps_loop_filter_across_slices_enabled_flag     : 1;
            /** \brief A combination of HEVC syntax element of
             *  sps_scaling_list_data_present_flag and
             *  pps_scaling_list_data_present_flag
             *  when scaling_list_enable_flag is 0, it must be 0.
             */
            uint32_t    scaling_list_data_present_flag                 : 1;
            /** \brief indicate the current picture contains significant
             *  screen contents (text, characters, etc.) or animated image.
             *  GPU may want to treat them differently from normal video.
             *  For example, encoder may choose a small transform unit size
             *  and may use transform skip mode.
             */
            uint32_t    screen_content_flag                            : 1;
            /**
             *  When either weighted_pred_flag or weighted_bipred_flag is
             *  turned on, the flag enable_gpu_weighted_prediction requests
             *  GPU to determine weighted prediction factors. In this case,
             *  the following parameters in slice control data structure
             *  shall be ignored:
             *  luma_log2_weight_denom, delta_chroma_log2_weight_denom,
             *  luma_offset_l0[15], luma_offset_l1[15],
             *  delta_luma_weight_l0[15], delta_luma_weight_l1[15],
             *  chroma_offset_l0[15][2], chroma_offset_l1[15][2],
             *  and delta_chroma_weight_l0[15][2], delta_chroma_weight_l1[15][2].
             */
            uint32_t    enable_gpu_weighted_prediction                 : 1;
            /** \brief HEVC syntax element in slice segment header
             *  GPU uses it to generate new slice headers in slice size control.
             */
            uint32_t    no_output_of_prior_pics_flag                   : 1;
            uint32_t    reserved                                       : 11;
        } bits;
        uint32_t        value;
    } pic_fields;

    /** \brief When hierachical_level_plus1 > 0, hierachical_level_plus1-1 indicates
     *the current frame's level.when it > 0. B1, B2 setting in CodingType can be treated as B,
     *hirachical level is determined by this variable.When hierachical_level_plus1  == 0,
     *hierarchical level information still comes from coding_type.
     */
    uint8_t     hierarchical_level_plus1;
    /** \brief Reserved bytes for future use, must be zero */
    uint8_t     va_byte_reserved;
    /** \brief SCC flags to enable/disable feature, only IBC at present.*/
    union {
        struct {
            /** \brief Same as the HEVC bitstream syntax element. */
            uint16_t    pps_curr_pic_ref_enabled_flag                  : 1;
            /** \brief Reserved bits for future use, must be zero */
            uint16_t    reserved                                       : 15;
        } bits;
        uint16_t value;
    } scc_fields;
    /** \brief Reserved bytes for future use, must be zero */
    uint32_t                va_reserved[VA_PADDING_HIGH - 1];
} VAEncPictureParameterBufferHEVC;

/**
 * \brief Slice parameter for HEVC encoding in main & main 10 profiles.
 *
 * This structure holds information for \c
 * slice_segment_layer_rbsp() as defined by the HEVC
 * specification.
 *
 * If packed slice headers mode is used, i.e. if the encoding
 * pipeline was configured with the #VA_ENC_PACKED_HEADER_SLICE
 * flag, then the driver expects two more buffers to be provided to
 * the same \c vaRenderPicture() as this buffer:
 * - a #VAEncPackedHeaderParameterBuffer with type set to
 *   VAEncPackedHeaderType::VAEncPackedHeaderSlice ;
 * - a #VAEncPackedHeaderDataBuffer which holds the actual packed
 *   header data.
 *
 */
typedef struct _VAEncSliceParameterBufferHEVC {
    /** \brief Starting CTU address for this slice. */
    uint32_t        slice_segment_address;
    /** \brief Number of CTUs in this slice. */
    uint32_t        num_ctu_in_slice;

    /** \brief Slice type.
     *  Corresponds to HEVC syntax element of the same name.
     */
    uint8_t         slice_type;
    /** \brief Same as the HEVC bitstream syntax element. */
    uint8_t         slice_pic_parameter_set_id;

    /** \brief Maximum reference index for reference picture list 0.
     *  Range: 0 to 14, inclusive.
     */
    uint8_t         num_ref_idx_l0_active_minus1;
    /** \brief Maximum reference index for reference picture list 1.
     *  Range: 0 to 14, inclusive.
     */
    uint8_t         num_ref_idx_l1_active_minus1;
    /** \brief Reference picture list 0 (for P slices). */
    VAPictureHEVC   ref_pic_list0[15];
    /** \brief Reference picture list 1 (for B slices). */
    VAPictureHEVC   ref_pic_list1[15];
    /**@}*/

    /** @name pred_weight_table() */
    /**@{*/
    /** \brief Same as the HEVC bitstream syntax element. */
    uint8_t         luma_log2_weight_denom;
    /** \brief Same as the HEVC bitstream syntax element. */
    int8_t          delta_chroma_log2_weight_denom;
    /** \brief Same as the HEVC bitstream syntax element. */
    int8_t          delta_luma_weight_l0[15];
    /** \brief Same as the HEVC bitstream syntax element. */
    int8_t          luma_offset_l0[15];
    /** \brief Same as the HEVC bitstream syntax element. */
    int8_t          delta_chroma_weight_l0[15][2];
    /** \brief Same as the HEVC spec variable ChromaOffsetL0[]. */
    int8_t          chroma_offset_l0[15][2];
    /** \brief Same as the HEVC bitstream syntax element. */
    int8_t          delta_luma_weight_l1[15];
    /** \brief Same as the HEVC bitstream syntax element. */
    int8_t          luma_offset_l1[15];
    /** \brief Same as the HEVC bitstream syntax element. */
    int8_t          delta_chroma_weight_l1[15][2];
    /** \brief Same as the HEVC spec variable ChromaOffsetL1[]. */
    int8_t          chroma_offset_l1[15][2];
    /**@}*/

    /** \brief Corresponds to HEVC spec variable MaxNumMergeCand.
     *  Range: [1..5].
     */
    uint8_t         max_num_merge_cand;

    /** \brief Same as the HEVC bitstream syntax element. */
    int8_t          slice_qp_delta;

    /** \brief Same as the HEVC bitstream syntax element. */
    int8_t          slice_cb_qp_offset;

    /** \brief Same as the HEVC bitstream syntax element. */
    int8_t          slice_cr_qp_offset;

    /** \brief Same as the HEVC bitstream syntax element. */
    int8_t          slice_beta_offset_div2;

    /** \brief Same as the HEVC bitstream syntax element. */
    int8_t          slice_tc_offset_div2;

    union {
        struct {
            /** \brief Indicates if current slice is the last one in picture */
            uint32_t    last_slice_of_pic_flag                         : 1;
            /** \brief Corresponds to HEVC syntax element of the same name */
            uint32_t    dependent_slice_segment_flag                   : 1;
            /** \brief Corresponds to HEVC syntax element of the same name */
            uint32_t    colour_plane_id                                : 2;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    slice_temporal_mvp_enabled_flag                : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    slice_sao_luma_flag                            : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    slice_sao_chroma_flag                          : 1;
            /** \brief Corresponds to HEVC syntax element of the same name.
             *  if this flag is set to 0, num_ref_idx_l0_active_minus1 should be
             *  equal to num_ref_idx_l0_default_active_minus1
             *  as well as for that for l1.
             */
            uint32_t    num_ref_idx_active_override_flag               : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    mvd_l1_zero_flag                               : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    cabac_init_flag                             : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    slice_deblocking_filter_disabled_flag          : 2;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    slice_loop_filter_across_slices_enabled_flag   : 1;
            /** \brief Corresponds to HEVC syntax element of the same name. */
            uint32_t    collocated_from_l0_flag                        : 1;
        } bits;
        uint32_t        value;
    } slice_fields;


    /**
     * \brief bit offset of syntax element pred_weight_table() in slice segment header.
     * It aligns with the starting position of the current packed slice header.
     * It is used when encoder prefers to override the weighted prediction parameters passed in
     * from application.
     * Please refer to enable_gpu_weighted_prediction in VAEncPictureParameterBufferHEVC.
     */
    uint32_t                pred_weight_table_bit_offset;
    /**
     * \brief bit length of syntax element pred_weight_table() in slice segment header.
     * It is used when encoder prefers to override the weighted prediction parameters passed in
     * from application.
     * Please refer to enable_gpu_weighted_prediction in VAEncPictureParameterBufferHEVC.
    */
    uint32_t                pred_weight_table_bit_length;
    /** \brief Reserved bytes for future use, must be zero */
    uint32_t                va_reserved[VA_PADDING_MEDIUM - 2];
    /**@}*/
} VAEncSliceParameterBufferHEVC;

/**
 * \brief HEVC Quantization Matrix Buffer Structure
 *
 * This structure is sent once per frame,
 * and only when scaling_list_enabled_flag = 1 and scaling_list_data_present_flag = 1.
 * Only when scaling_list_data_present_flag = 1, app still
 * needs to send in this structure. When scaling_list_enabled_flag = 1 and
 * scaling_list_data_present_flag = 0, driver is responsible to generate
 * the default scaling list values.
 *
 * Matrix entries are in raster scan order which follows HEVC spec.
 */
typedef struct _VAQMatrixBufferHEVC {
    /**
     * \brief scaling lists,
     * corresponds to same HEVC spec syntax element
     * ScalingList[ i ][ MatrixID ][ j ].
     *
     * \brief 4x4 scaling,
     */
    uint8_t             scaling_lists_4x4[3][2][16];
    /**
     * \brief 8x8 scaling,
     */
    uint8_t             scaling_lists_8x8[3][2][64];
    /**
     * \brief 16x16 scaling,
     * correspongs i = 2, MatrixID is in the range of 0 to 5,
     * inclusive. And j is in the range of 0 to 63, inclusive.
     */
    uint8_t             scaling_lists_16x16[3][2][64];
    /**
     * \brief 32x32 scaling,
     * correspongs i = 3, MatrixID is in the range of 0 to 1,
     * inclusive. And j is in the range of 0 to 63, inclusive.
     */
    uint8_t             scaling_lists_32x32[2][64];
    /**
     * \brief DC values of the 16x16 scaling lists,
     * corresponds to HEVC spec syntax
     * scaling_list_dc_coef_minus8[ sizeID - 2 ][ matrixID ] + 8
     * with sizeID = 2 and matrixID in the range of 0 to 5, inclusive.
     */
    uint8_t             scaling_list_dc_16x16[3][2];
    /**
     * \brief DC values of the 32x32 scaling lists,
     * corresponds to HEVC spec syntax
     * scaling_list_dc_coef_minus8[ sizeID - 2 ][ matrixID ] + 8
     * with sizeID = 3 and matrixID in the range of 0 to 1, inclusive.
     */
    uint8_t             scaling_list_dc_32x32[2];

    /** \brief Reserved bytes for future use, must be zero */
    uint32_t                va_reserved[VA_PADDING_LOW];
} VAQMatrixBufferHEVC;

/**@}*/

#ifdef __cplusplus
}
#endif

#endif /* VA_ENC_HEVC_H */