/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2019 Pengutronix, Michael Tretter <kernel@pengutronix.de>
 *
 * Convert NAL units between raw byte sequence payloads (RBSP) and C structs.
 */

#ifndef __NAL_HEVC_H__
#define __NAL_HEVC_H__

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/v4l2-controls.h>
#include <linux/videodev2.h>

struct nal_hevc_profile_tier_level {
        unsigned int general_profile_space;
        unsigned int general_tier_flag;
        unsigned int general_profile_idc;
        unsigned int general_profile_compatibility_flag[32];
        unsigned int general_progressive_source_flag;
        unsigned int general_interlaced_source_flag;
        unsigned int general_non_packed_constraint_flag;
        unsigned int general_frame_only_constraint_flag;
        union {
                struct {
                        unsigned int general_max_12bit_constraint_flag;
                        unsigned int general_max_10bit_constraint_flag;
                        unsigned int general_max_8bit_constraint_flag;
                        unsigned int general_max_422chroma_constraint_flag;
                        unsigned int general_max_420chroma_constraint_flag;
                        unsigned int general_max_monochrome_constraint_flag;
                        unsigned int general_intra_constraint_flag;
                        unsigned int general_one_picture_only_constraint_flag;
                        unsigned int general_lower_bit_rate_constraint_flag;
                        union {
                                struct {
                                        unsigned int general_max_14bit_constraint_flag;
                                        unsigned int general_reserved_zero_33bits;
                                };
                                unsigned int general_reserved_zero_34bits;
                        };
                };
                struct {
                        unsigned int general_reserved_zero_7bits;
                        /* unsigned int general_one_picture_only_constraint_flag; */
                        unsigned int general_reserved_zero_35bits;
                };
                unsigned int general_reserved_zero_43bits;
        };
        union {
                unsigned int general_inbld_flag;
                unsigned int general_reserved_zero_bit;
        };
        unsigned int general_level_idc;
};

/*
 * struct nal_hevc_vps - Video parameter set
 *
 * C struct representation of the video parameter set NAL unit as defined by
 * Rec. ITU-T H.265 (02/2018) 7.3.2.1 Video parameter set RBSP syntax
 */
struct nal_hevc_vps {
        unsigned int video_parameter_set_id;
        unsigned int base_layer_internal_flag;
        unsigned int base_layer_available_flag;
        unsigned int max_layers_minus1;
        unsigned int max_sub_layers_minus1;
        unsigned int temporal_id_nesting_flag;
        struct nal_hevc_profile_tier_level profile_tier_level;
        unsigned int sub_layer_ordering_info_present_flag;
        struct {
                unsigned int max_dec_pic_buffering_minus1[7];
                unsigned int max_num_reorder_pics[7];
                unsigned int max_latency_increase_plus1[7];
        };
        unsigned int max_layer_id;
        unsigned int num_layer_sets_minus1;
        unsigned int layer_id_included_flag[1024][64];
        unsigned int timing_info_present_flag;
        struct {
                unsigned int num_units_in_tick;
                unsigned int time_scale;
                unsigned int poc_proportional_to_timing_flag;
                unsigned int num_ticks_poc_diff_one_minus1;
                unsigned int num_hrd_parameters;
                struct {
                        unsigned int hrd_layer_set_idx[0];
                        unsigned int cprms_present_flag[0];
                };
                /* hrd_parameters( cprms_present_flag[ i ], max_sub_layers_minus1 ) */
        };
        unsigned int extension_flag;
        unsigned int extension_data_flag;
};

#define N_HRD_PARAMS 1
struct nal_hevc_sub_layer_hrd_parameters {
        unsigned int bit_rate_value_minus1[N_HRD_PARAMS];
        unsigned int cpb_size_value_minus1[N_HRD_PARAMS];
        unsigned int cbr_flag[N_HRD_PARAMS];
};

struct nal_hevc_hrd_parameters {
        unsigned int nal_hrd_parameters_present_flag;
        unsigned int vcl_hrd_parameters_present_flag;
        struct {
                unsigned int sub_pic_hrd_params_present_flag;
                struct {
                        unsigned int tick_divisor_minus2;
                        unsigned int du_cpb_removal_delay_increment_length_minus1;
                        unsigned int sub_pic_cpb_params_in_pic_timing_sei_flag;
                        unsigned int dpb_output_delay_du_length_minus1;
                };
                unsigned int bit_rate_scale;
                unsigned int cpb_size_scale;
                unsigned int cpb_size_du_scale;
                unsigned int initial_cpb_removal_delay_length_minus1;
                unsigned int au_cpb_removal_delay_length_minus1;
                unsigned int dpb_output_delay_length_minus1;
        };
        struct {
                unsigned int fixed_pic_rate_general_flag[1];
                unsigned int fixed_pic_rate_within_cvs_flag[1];
                unsigned int elemental_duration_in_tc_minus1[1];
                unsigned int low_delay_hrd_flag[1];
                unsigned int cpb_cnt_minus1[1];
                struct nal_hevc_sub_layer_hrd_parameters nal_hrd[1];
                struct nal_hevc_sub_layer_hrd_parameters vcl_hrd[1];
        };
};

/*
 * struct nal_hevc_vui_parameters - VUI parameters
 *
 * C struct representation of the VUI parameters as defined by Rec. ITU-T
 * H.265 (02/2018) E.2.1 VUI parameters syntax.
 */
struct nal_hevc_vui_parameters {
        unsigned int aspect_ratio_info_present_flag;
        struct {
                unsigned int aspect_ratio_idc;
                unsigned int sar_width;
                unsigned int sar_height;
        };
        unsigned int overscan_info_present_flag;
        unsigned int overscan_appropriate_flag;
        unsigned int video_signal_type_present_flag;
        struct {
                unsigned int video_format;
                unsigned int video_full_range_flag;
                unsigned int colour_description_present_flag;
                struct {
                        unsigned int colour_primaries;
                        unsigned int transfer_characteristics;
                        unsigned int matrix_coeffs;
                };
        };
        unsigned int chroma_loc_info_present_flag;
        struct {
                unsigned int chroma_sample_loc_type_top_field;
                unsigned int chroma_sample_loc_type_bottom_field;
        };
        unsigned int neutral_chroma_indication_flag;
        unsigned int field_seq_flag;
        unsigned int frame_field_info_present_flag;
        unsigned int default_display_window_flag;
        struct {
                unsigned int def_disp_win_left_offset;
                unsigned int def_disp_win_right_offset;
                unsigned int def_disp_win_top_offset;
                unsigned int def_disp_win_bottom_offset;
        };
        unsigned int vui_timing_info_present_flag;
        struct {
                unsigned int vui_num_units_in_tick;
                unsigned int vui_time_scale;
                unsigned int vui_poc_proportional_to_timing_flag;
                unsigned int vui_num_ticks_poc_diff_one_minus1;
                unsigned int vui_hrd_parameters_present_flag;
                struct nal_hevc_hrd_parameters nal_hrd_parameters;
        };
        unsigned int bitstream_restriction_flag;
        struct {
                unsigned int tiles_fixed_structure_flag;
                unsigned int motion_vectors_over_pic_boundaries_flag;
                unsigned int restricted_ref_pic_lists_flag;
                unsigned int min_spatial_segmentation_idc;
                unsigned int max_bytes_per_pic_denom;
                unsigned int max_bits_per_min_cu_denom;
                unsigned int log2_max_mv_length_horizontal;
                unsigned int log2_max_mv_length_vertical;
        };
};

/*
 * struct nal_hevc_sps - Sequence parameter set
 *
 * C struct representation of the video parameter set NAL unit as defined by
 * Rec. ITU-T H.265 (02/2018) 7.3.2.2 Sequence parameter set RBSP syntax
 */
struct nal_hevc_sps {
        unsigned int video_parameter_set_id;
        unsigned int max_sub_layers_minus1;
        unsigned int temporal_id_nesting_flag;
        struct nal_hevc_profile_tier_level profile_tier_level;
        unsigned int seq_parameter_set_id;
        unsigned int chroma_format_idc;
        unsigned int separate_colour_plane_flag;
        unsigned int pic_width_in_luma_samples;
        unsigned int pic_height_in_luma_samples;
        unsigned int conformance_window_flag;
        struct {
                unsigned int conf_win_left_offset;
                unsigned int conf_win_right_offset;
                unsigned int conf_win_top_offset;
                unsigned int conf_win_bottom_offset;
        };

        unsigned int bit_depth_luma_minus8;
        unsigned int bit_depth_chroma_minus8;
        unsigned int log2_max_pic_order_cnt_lsb_minus4;
        unsigned int sub_layer_ordering_info_present_flag;
        struct {
                unsigned int max_dec_pic_buffering_minus1[7];
                unsigned int max_num_reorder_pics[7];
                unsigned int max_latency_increase_plus1[7];
        };
        unsigned int log2_min_luma_coding_block_size_minus3;
        unsigned int log2_diff_max_min_luma_coding_block_size;
        unsigned int log2_min_luma_transform_block_size_minus2;
        unsigned int log2_diff_max_min_luma_transform_block_size;
        unsigned int max_transform_hierarchy_depth_inter;
        unsigned int max_transform_hierarchy_depth_intra;

        unsigned int scaling_list_enabled_flag;
        unsigned int scaling_list_data_present_flag;
        unsigned int amp_enabled_flag;
        unsigned int sample_adaptive_offset_enabled_flag;
        unsigned int pcm_enabled_flag;
        struct {
                unsigned int pcm_sample_bit_depth_luma_minus1;
                unsigned int pcm_sample_bit_depth_chroma_minus1;
                unsigned int log2_min_pcm_luma_coding_block_size_minus3;
                unsigned int log2_diff_max_min_pcm_luma_coding_block_size;
                unsigned int pcm_loop_filter_disabled_flag;
        };

        unsigned int num_short_term_ref_pic_sets;
        unsigned int long_term_ref_pics_present_flag;
        unsigned int sps_temporal_mvp_enabled_flag;
        unsigned int strong_intra_smoothing_enabled_flag;
        unsigned int vui_parameters_present_flag;
        struct nal_hevc_vui_parameters vui;
        unsigned int extension_present_flag;
        struct {
                unsigned int sps_range_extension_flag;
                unsigned int sps_multilayer_extension_flag;
                unsigned int sps_3d_extension_flag;
                unsigned int sps_scc_extension_flag;
                unsigned int sps_extension_4bits;
        };
};

struct nal_hevc_pps {
        unsigned int pps_pic_parameter_set_id;
        unsigned int pps_seq_parameter_set_id;
        unsigned int dependent_slice_segments_enabled_flag;
        unsigned int output_flag_present_flag;
        unsigned int num_extra_slice_header_bits;
        unsigned int sign_data_hiding_enabled_flag;
        unsigned int cabac_init_present_flag;
        unsigned int num_ref_idx_l0_default_active_minus1;
        unsigned int num_ref_idx_l1_default_active_minus1;
        int init_qp_minus26;
        unsigned int constrained_intra_pred_flag;
        unsigned int transform_skip_enabled_flag;
        unsigned int cu_qp_delta_enabled_flag;
        unsigned int diff_cu_qp_delta_depth;
        int pps_cb_qp_offset;
        int pps_cr_qp_offset;
        unsigned int pps_slice_chroma_qp_offsets_present_flag;
        unsigned int weighted_pred_flag;
        unsigned int weighted_bipred_flag;
        unsigned int transquant_bypass_enabled_flag;
        unsigned int tiles_enabled_flag;
        unsigned int entropy_coding_sync_enabled_flag;
        struct {
                unsigned int num_tile_columns_minus1;
                unsigned int num_tile_rows_minus1;
                unsigned int uniform_spacing_flag;
                struct {
                        unsigned int column_width_minus1[1];
                        unsigned int row_height_minus1[1];
                };
                unsigned int loop_filter_across_tiles_enabled_flag;
        };
        unsigned int pps_loop_filter_across_slices_enabled_flag;
        unsigned int deblocking_filter_control_present_flag;
        struct {
                unsigned int deblocking_filter_override_enabled_flag;
                unsigned int pps_deblocking_filter_disabled_flag;
                struct {
                        int pps_beta_offset_div2;
                        int pps_tc_offset_div2;
                };
        };
        unsigned int pps_scaling_list_data_present_flag;
        unsigned int lists_modification_present_flag;
        unsigned int log2_parallel_merge_level_minus2;
        unsigned int slice_segment_header_extension_present_flag;
        unsigned int pps_extension_present_flag;
        struct {
                unsigned int pps_range_extension_flag;
                unsigned int pps_multilayer_extension_flag;
                unsigned int pps_3d_extension_flag;
                unsigned int pps_scc_extension_flag;
                unsigned int pps_extension_4bits;
        };
};

/**
 * nal_hevc_profile() - Get profile_idc for v4l2 hevc profile
 * @profile: the profile as &enum v4l2_mpeg_video_hevc_profile
 *
 * Convert the &enum v4l2_mpeg_video_hevc_profile to profile_idc as specified
 * in Rec. ITU-T H.265 (02/2018) A.3.
 *
 * Return: the profile_idc for the passed level
 */
static inline int nal_hevc_profile(enum v4l2_mpeg_video_hevc_profile profile)
{
        switch (profile) {
        case V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN:
                return 1;
        case V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN_10:
                return 2;
        case V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN_STILL_PICTURE:
                return 3;
        default:
                return -EINVAL;
        }
}

/**
 * nal_hevc_tier() - Get tier_flag for v4l2 hevc tier
 * @tier: the tier as &enum v4l2_mpeg_video_hevc_tier
 *
 * Convert the &enum v4l2_mpeg_video_hevc_tier to tier_flag as specified
 * in Rec. ITU-T H.265 (02/2018) A.4.1.
 *
 * Return: the tier_flag for the passed tier
 */
static inline int nal_hevc_tier(enum v4l2_mpeg_video_hevc_tier tier)
{
        switch (tier) {
        case V4L2_MPEG_VIDEO_HEVC_TIER_MAIN:
                return 0;
        case V4L2_MPEG_VIDEO_HEVC_TIER_HIGH:
                return 1;
        default:
                return -EINVAL;
        }
}

/**
 * nal_hevc_level() - Get level_idc for v4l2 hevc level
 * @level: the level as &enum v4l2_mpeg_video_hevc_level
 *
 * Convert the &enum v4l2_mpeg_video_hevc_level to level_idc as specified in
 * Rec. ITU-T H.265 (02/2018) A.4.1.
 *
 * Return: the level_idc for the passed level
 */
static inline int nal_hevc_level(enum v4l2_mpeg_video_hevc_level level)
{
        /*
         * T-Rec-H.265 p. 280: general_level_idc and sub_layer_level_idc[ i ]
         * shall be set equal to a value of 30 times the level number
         * specified in Table A.6.
         */
        int factor = 30 / 10;

        switch (level) {
        case V4L2_MPEG_VIDEO_HEVC_LEVEL_1:
                return factor * 10;
        case V4L2_MPEG_VIDEO_HEVC_LEVEL_2:
                return factor * 20;
        case V4L2_MPEG_VIDEO_HEVC_LEVEL_2_1:
                return factor * 21;
        case V4L2_MPEG_VIDEO_HEVC_LEVEL_3:
                return factor * 30;
        case V4L2_MPEG_VIDEO_HEVC_LEVEL_3_1:
                return factor * 31;
        case V4L2_MPEG_VIDEO_HEVC_LEVEL_4:
                return factor * 40;
        case V4L2_MPEG_VIDEO_HEVC_LEVEL_4_1:
                return factor * 41;
        case V4L2_MPEG_VIDEO_HEVC_LEVEL_5:
                return factor * 50;
        case V4L2_MPEG_VIDEO_HEVC_LEVEL_5_1:
                return factor * 51;
        case V4L2_MPEG_VIDEO_HEVC_LEVEL_5_2:
                return factor * 52;
        case V4L2_MPEG_VIDEO_HEVC_LEVEL_6:
                return factor * 60;
        case V4L2_MPEG_VIDEO_HEVC_LEVEL_6_1:
                return factor * 61;
        case V4L2_MPEG_VIDEO_HEVC_LEVEL_6_2:
                return factor * 62;
        default:
                return -EINVAL;
        }
}

static inline int nal_hevc_full_range(enum v4l2_quantization quantization)
{
        switch (quantization) {
        case V4L2_QUANTIZATION_FULL_RANGE:
                return 1;
        case V4L2_QUANTIZATION_LIM_RANGE:
                return 0;
        default:
                break;
        }

        return 0;
}

static inline int nal_hevc_color_primaries(enum v4l2_colorspace colorspace)
{
        switch (colorspace) {
        case V4L2_COLORSPACE_SMPTE170M:
                return 6;
        case V4L2_COLORSPACE_SMPTE240M:
                return 7;
        case V4L2_COLORSPACE_REC709:
                return 1;
        case V4L2_COLORSPACE_470_SYSTEM_M:
                return 4;
        case V4L2_COLORSPACE_JPEG:
        case V4L2_COLORSPACE_SRGB:
        case V4L2_COLORSPACE_470_SYSTEM_BG:
                return 5;
        case V4L2_COLORSPACE_BT2020:
                return 9;
        case V4L2_COLORSPACE_DEFAULT:
        case V4L2_COLORSPACE_OPRGB:
        case V4L2_COLORSPACE_RAW:
        case V4L2_COLORSPACE_DCI_P3:
        default:
                return 2;
        }
}

static inline int nal_hevc_transfer_characteristics(enum v4l2_colorspace colorspace,
                                                    enum v4l2_xfer_func xfer_func)
{
        if (xfer_func == V4L2_XFER_FUNC_DEFAULT)
                xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(colorspace);

        switch (xfer_func) {
        case V4L2_XFER_FUNC_709:
                return 6;
        case V4L2_XFER_FUNC_SMPTE2084:
                return 16;
        case V4L2_XFER_FUNC_SRGB:
        case V4L2_XFER_FUNC_OPRGB:
        case V4L2_XFER_FUNC_NONE:
        case V4L2_XFER_FUNC_DCI_P3:
        case V4L2_XFER_FUNC_SMPTE240M:
        default:
                return 2;
        }
}

static inline int nal_hevc_matrix_coeffs(enum v4l2_colorspace colorspace,
                                         enum v4l2_ycbcr_encoding ycbcr_encoding)
{
        if (ycbcr_encoding == V4L2_YCBCR_ENC_DEFAULT)
                ycbcr_encoding = V4L2_MAP_YCBCR_ENC_DEFAULT(colorspace);

        switch (ycbcr_encoding) {
        case V4L2_YCBCR_ENC_601:
        case V4L2_YCBCR_ENC_XV601:
                return 5;
        case V4L2_YCBCR_ENC_709:
        case V4L2_YCBCR_ENC_XV709:
                return 1;
        case V4L2_YCBCR_ENC_BT2020:
                return 9;
        case V4L2_YCBCR_ENC_BT2020_CONST_LUM:
                return 10;
        case V4L2_YCBCR_ENC_SMPTE240M:
        default:
                return 2;
        }
}

ssize_t nal_hevc_write_vps(const struct device *dev,
                           void *dest, size_t n, struct nal_hevc_vps *vps);
ssize_t nal_hevc_read_vps(const struct device *dev,
                          struct nal_hevc_vps *vps, void *src, size_t n);

ssize_t nal_hevc_write_sps(const struct device *dev,
                           void *dest, size_t n, struct nal_hevc_sps *sps);
ssize_t nal_hevc_read_sps(const struct device *dev,
                          struct nal_hevc_sps *sps, void *src, size_t n);

ssize_t nal_hevc_write_pps(const struct device *dev,
                           void *dest, size_t n, struct nal_hevc_pps *pps);
ssize_t nal_hevc_read_pps(const struct device *dev,
                          struct nal_hevc_pps *pps, void *src, size_t n);

ssize_t nal_hevc_write_filler(const struct device *dev, void *dest, size_t n);
ssize_t nal_hevc_read_filler(const struct device *dev, void *src, size_t n);

#endif /* __NAL_HEVC_H__ */