/*
 * HEVC shared code
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_HEVC_H
#define AVCODEC_HEVC_H

/**
 * Table 7-1 – NAL unit type codes and NAL unit type classes in
 * T-REC-H.265-201802
 */
enum HEVCNALUnitType {
    HEVC_NAL_TRAIL_N    = 0,
    HEVC_NAL_TRAIL_R    = 1,
    HEVC_NAL_TSA_N      = 2,
    HEVC_NAL_TSA_R      = 3,
    HEVC_NAL_STSA_N     = 4,
    HEVC_NAL_STSA_R     = 5,
    HEVC_NAL_RADL_N     = 6,
    HEVC_NAL_RADL_R     = 7,
    HEVC_NAL_RASL_N     = 8,
    HEVC_NAL_RASL_R     = 9,
    HEVC_NAL_VCL_N10    = 10,
    HEVC_NAL_VCL_R11    = 11,
    HEVC_NAL_VCL_N12    = 12,
    HEVC_NAL_VCL_R13    = 13,
    HEVC_NAL_VCL_N14    = 14,
    HEVC_NAL_VCL_R15    = 15,
    HEVC_NAL_BLA_W_LP   = 16,
    HEVC_NAL_BLA_W_RADL = 17,
    HEVC_NAL_BLA_N_LP   = 18,
    HEVC_NAL_IDR_W_RADL = 19,
    HEVC_NAL_IDR_N_LP   = 20,
    HEVC_NAL_CRA_NUT    = 21,
    HEVC_NAL_IRAP_VCL22 = 22,
    HEVC_NAL_IRAP_VCL23 = 23,
    HEVC_NAL_RSV_VCL24  = 24,
    HEVC_NAL_RSV_VCL25  = 25,
    HEVC_NAL_RSV_VCL26  = 26,
    HEVC_NAL_RSV_VCL27  = 27,
    HEVC_NAL_RSV_VCL28  = 28,
    HEVC_NAL_RSV_VCL29  = 29,
    HEVC_NAL_RSV_VCL30  = 30,
    HEVC_NAL_RSV_VCL31  = 31,
    HEVC_NAL_VPS        = 32,
    HEVC_NAL_SPS        = 33,
    HEVC_NAL_PPS        = 34,
    HEVC_NAL_AUD        = 35,
    HEVC_NAL_EOS_NUT    = 36,
    HEVC_NAL_EOB_NUT    = 37,
    HEVC_NAL_FD_NUT     = 38,
    HEVC_NAL_SEI_PREFIX = 39,
    HEVC_NAL_SEI_SUFFIX = 40,
    HEVC_NAL_RSV_NVCL41 = 41,
    HEVC_NAL_RSV_NVCL42 = 42,
    HEVC_NAL_RSV_NVCL43 = 43,
    HEVC_NAL_RSV_NVCL44 = 44,
    HEVC_NAL_RSV_NVCL45 = 45,
    HEVC_NAL_RSV_NVCL46 = 46,
    HEVC_NAL_RSV_NVCL47 = 47,
    HEVC_NAL_UNSPEC48   = 48,
    HEVC_NAL_UNSPEC49   = 49,
    HEVC_NAL_UNSPEC50   = 50,
    HEVC_NAL_UNSPEC51   = 51,
    HEVC_NAL_UNSPEC52   = 52,
    HEVC_NAL_UNSPEC53   = 53,
    HEVC_NAL_UNSPEC54   = 54,
    HEVC_NAL_UNSPEC55   = 55,
    HEVC_NAL_UNSPEC56   = 56,
    HEVC_NAL_UNSPEC57   = 57,
    HEVC_NAL_UNSPEC58   = 58,
    HEVC_NAL_UNSPEC59   = 59,
    HEVC_NAL_UNSPEC60   = 60,
    HEVC_NAL_UNSPEC61   = 61,
    HEVC_NAL_UNSPEC62   = 62,
    HEVC_NAL_UNSPEC63   = 63,
};

enum HEVCSliceType {
    HEVC_SLICE_B = 0,
    HEVC_SLICE_P = 1,
    HEVC_SLICE_I = 2,
};

enum {
    // 7.4.3.1: vps_max_layers_minus1 is in [0, 62].
    HEVC_MAX_LAYERS     = 63,
    // 7.4.3.1: vps_max_sub_layers_minus1 is in [0, 6].
    HEVC_MAX_SUB_LAYERS = 7,
    // 7.4.3.1: vps_num_layer_sets_minus1 is in [0, 1023].
    HEVC_MAX_LAYER_SETS = 1024,

    // 7.4.2.1: vps_video_parameter_set_id is u(4).
    HEVC_MAX_VPS_COUNT = 16,
    // 7.4.3.2.1: sps_seq_parameter_set_id is in [0, 15].
    HEVC_MAX_SPS_COUNT = 16,
    // 7.4.3.3.1: pps_pic_parameter_set_id is in [0, 63].
    HEVC_MAX_PPS_COUNT = 64,

    // A.4.2: MaxDpbSize is bounded above by 16.
    HEVC_MAX_DPB_SIZE = 16,
    // 7.4.3.1: vps_max_dec_pic_buffering_minus1[i] is in [0, MaxDpbSize - 1].
    HEVC_MAX_REFS     = HEVC_MAX_DPB_SIZE,

    // 7.4.3.2.1: num_short_term_ref_pic_sets is in [0, 64].
    HEVC_MAX_SHORT_TERM_REF_PIC_SETS = 64,
    // 7.4.3.2.1: num_long_term_ref_pics_sps is in [0, 32].
    HEVC_MAX_LONG_TERM_REF_PICS      = 32,

    // A.3: all profiles require that CtbLog2SizeY is in [4, 6].
    HEVC_MIN_LOG2_CTB_SIZE = 4,
    HEVC_MAX_LOG2_CTB_SIZE = 6,

    // E.3.2: cpb_cnt_minus1[i] is in [0, 31].
    HEVC_MAX_CPB_CNT = 32,

    // A.4.1: in table A.6 the highest level allows a MaxLumaPs of 35 651 584.
    HEVC_MAX_LUMA_PS = 35651584,
    // A.4.1: pic_width_in_luma_samples and pic_height_in_luma_samples are
    // constrained to be not greater than sqrt(MaxLumaPs * 8).  Hence height/
    // width are bounded above by sqrt(8 * 35651584) = 16888.2 samples.
    HEVC_MAX_WIDTH  = 16888,
    HEVC_MAX_HEIGHT = 16888,

    // A.4.1: table A.6 allows at most 22 tile rows for any level.
    HEVC_MAX_TILE_ROWS    = 22,
    // A.4.1: table A.6 allows at most 20 tile columns for any level.
    HEVC_MAX_TILE_COLUMNS = 20,

    // A.4.2: table A.6 allows at most 600 slice segments for any level.
    HEVC_MAX_SLICE_SEGMENTS = 600,

    // 7.4.7.1: in the worst case (tiles_enabled_flag and
    // entropy_coding_sync_enabled_flag are both set), entry points can be
    // placed at the beginning of every Ctb row in every tile, giving an
    // upper bound of (num_tile_columns_minus1 + 1) * PicHeightInCtbsY - 1.
    // Only a stream with very high resolution and perverse parameters could
    // get near that, though, so set a lower limit here with the maximum
    // possible value for 4K video (at most 135 16x16 Ctb rows).
    HEVC_MAX_ENTRY_POINT_OFFSETS = HEVC_MAX_TILE_COLUMNS * 135,
};


#endif /* AVCODEC_HEVC_H */