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/*
* EVC definitions and enums
* Copyright (c) 2022 Dawid Kozinski <d.kozinski@samsung.com>
*
* 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_EVC_H
#define AVCODEC_EVC_H
// The length field that indicates the length in bytes of the following NAL unit is configured to be of 4 bytes
#define EVC_NALU_LENGTH_PREFIX_SIZE (4) /* byte */
#define EVC_NALU_HEADER_SIZE (2) /* byte */
/**
* @see ISO_IEC_23094-1_2020, 7.4.2.2 NAL unit header semantic
* Table 4 - NAL unit type codes and NAL unit type classes
*/
enum EVCNALUnitType {
EVC_NOIDR_NUT = 0, /* Coded slice of a non-IDR picture */
EVC_IDR_NUT = 1, /* Coded slice of an IDR picture */
EVC_RSV_VCL_NUT02 = 2,
EVC_RSV_VCL_NUT03 = 3,
EVC_RSV_VCL_NUT04 = 4,
EVC_RSV_VCL_NUT05 = 5,
EVC_RSV_VCL_NUT06 = 6,
EVC_RSV_VCL_NUT07 = 7,
EVC_RSV_VCL_NUT08 = 8,
EVC_RSV_VCL_NUT09 = 9,
EVC_RSV_VCL_NUT10 = 10,
EVC_RSV_VCL_NUT11 = 11,
EVC_RSV_VCL_NUT12 = 12,
EVC_RSV_VCL_NUT13 = 13,
EVC_RSV_VCL_NUT14 = 14,
EVC_RSV_VCL_NUT15 = 15,
EVC_RSV_VCL_NUT16 = 16,
EVC_RSV_VCL_NUT17 = 17,
EVC_RSV_VCL_NUT18 = 18,
EVC_RSV_VCL_NUT19 = 19,
EVC_RSV_VCL_NUT20 = 20,
EVC_RSV_VCL_NUT21 = 21,
EVC_RSV_VCL_NUT22 = 22,
EVC_RSV_VCL_NUT23 = 23,
EVC_SPS_NUT = 24, /* Sequence parameter set */
EVC_PPS_NUT = 25, /* Picture paremeter set */
EVC_APS_NUT = 26, /* Adaptation parameter set */
EVC_FD_NUT = 27, /* Filler data */
EVC_SEI_NUT = 28, /* Supplemental enhancement information */
EVC_RSV_NONVCL29 = 29,
EVC_RSV_NONVCL30 = 30,
EVC_RSV_NONVCL31 = 31,
EVC_RSV_NONVCL32 = 32,
EVC_RSV_NONVCL33 = 33,
EVC_RSV_NONVCL34 = 34,
EVC_RSV_NONVCL35 = 35,
EVC_RSV_NONVCL36 = 36,
EVC_RSV_NONVCL37 = 37,
EVC_RSV_NONVCL38 = 38,
EVC_RSV_NONVCL39 = 39,
EVC_RSV_NONVCL40 = 40,
EVC_RSV_NONVCL41 = 41,
EVC_RSV_NONVCL42 = 42,
EVC_RSV_NONVCL43 = 43,
EVC_RSV_NONVCL44 = 44,
EVC_RSV_NONVCL45 = 45,
EVC_RSV_NONVCL46 = 46,
EVC_RSV_NONVCL47 = 47,
EVC_RSV_NONVCL48 = 48,
EVC_RSV_NONVCL49 = 49,
EVC_RSV_NONVCL50 = 50,
EVC_RSV_NONVCL51 = 51,
EVC_RSV_NONVCL52 = 52,
EVC_RSV_NONVCL53 = 53,
EVC_RSV_NONVCL54 = 54,
EVC_RSV_NONVCL55 = 55,
EVC_UNSPEC_NUT56 = 56,
EVC_UNSPEC_NUT57 = 57,
EVC_UNSPEC_NUT58 = 58,
EVC_UNSPEC_NUT59 = 59,
EVC_UNSPEC_NUT60 = 60,
EVC_UNSPEC_NUT61 = 61,
EVC_UNSPEC_NUT62 = 62
};
// slice type
// @see ISO_IEC_23094-1_2020 7.4.5 Slice header semantics
//
enum EVCSliceType {
EVC_SLICE_TYPE_B = 0,
EVC_SLICE_TYPE_P = 1,
EVC_SLICE_TYPE_I = 2
};
enum {
// 7.4.3.2: aps_video_parameter_set_id is u(4).
EVC_MAX_APS_COUNT = 32,
// 7.4.3.1: sps_seq_parameter_set_id is in [0, 15].
EVC_MAX_SPS_COUNT = 16,
// 7.4.3.2: pps_pic_parameter_set_id is in [0, 63].
EVC_MAX_PPS_COUNT = 64,
// 7.4.5: slice header slice_pic_parameter_set_id in [0, 63]
EVC_MAX_SH_COUNT = 64,
// E.3.2: cpb_cnt_minus1[i] is in [0, 31].
EVC_MAX_CPB_CNT = 32,
// A.4.1: in table A.1 the highest level allows a MaxLumaPs of 35 651 584.
EVC_MAX_LUMA_PS = 35651584,
EVC_MAX_NUM_REF_PICS = 21,
EVC_MAX_NUM_RPLS = 64,
// 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.
EVC_MAX_WIDTH = 16888,
EVC_MAX_HEIGHT = 16888,
// A.4.1: table A.1 allows at most 22 tile rows for any level.
EVC_MAX_TILE_ROWS = 22,
// A.4.1: table A.1 allows at most 20 tile columns for any level.
EVC_MAX_TILE_COLUMNS = 20,
// A.4.1: table A.1 allows at most 600 slice segments for any level.
EVC_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 = EVC_MAX_TILE_COLUMNS * 135,
};
#endif // AVCODEC_EVC_H
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