FFmpeg/libavcodec/hevc.h

/*
 * 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_RSV_IRAP_VCL22 = 22,
    HEVC_NAL_RSV_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 */