FFmpeg
hevc.h
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1 /*
2  * HEVC shared code
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVCODEC_HEVC_H
22 #define AVCODEC_HEVC_H
23 
24 /**
25  * Table 7-1 – NAL unit type codes and NAL unit type classes in
26  * T-REC-H.265-201802
27  */
93 };
94 
99 };
100 
101 enum {
102  // 7.4.3.1: vps_max_layers_minus1 is in [0, 62].
104  // 7.4.3.1: vps_max_sub_layers_minus1 is in [0, 6].
106  // 7.4.3.1: vps_num_layer_sets_minus1 is in [0, 1023].
108 
109  // 7.4.2.1: vps_video_parameter_set_id is u(4).
111  // 7.4.3.2.1: sps_seq_parameter_set_id is in [0, 15].
113  // 7.4.3.3.1: pps_pic_parameter_set_id is in [0, 63].
115 
116  // A.4.2: MaxDpbSize is bounded above by 16.
118  // 7.4.3.1: vps_max_dec_pic_buffering_minus1[i] is in [0, MaxDpbSize - 1].
120 
121  // 7.4.3.2.1: num_short_term_ref_pic_sets is in [0, 64].
123  // 7.4.3.2.1: num_long_term_ref_pics_sps is in [0, 32].
125 
126  // A.3: all profiles require that CtbLog2SizeY is in [4, 6].
129 
130  // E.3.2: cpb_cnt_minus1[i] is in [0, 31].
132 
133  // A.4.1: in table A.6 the highest level allows a MaxLumaPs of 35 651 584.
134  HEVC_MAX_LUMA_PS = 35651584,
135  // A.4.1: pic_width_in_luma_samples and pic_height_in_luma_samples are
136  // constrained to be not greater than sqrt(MaxLumaPs * 8). Hence height/
137  // width are bounded above by sqrt(8 * 35651584) = 16888.2 samples.
138  HEVC_MAX_WIDTH = 16888,
140 
141  // A.4.1: table A.6 allows at most 22 tile rows for any level.
143  // A.4.1: table A.6 allows at most 20 tile columns for any level.
145 
146  // A.4.2: table A.6 allows at most 600 slice segments for any level.
148 
149  // 7.4.7.1: in the worst case (tiles_enabled_flag and
150  // entropy_coding_sync_enabled_flag are both set), entry points can be
151  // placed at the beginning of every Ctb row in every tile, giving an
152  // upper bound of (num_tile_columns_minus1 + 1) * PicHeightInCtbsY - 1.
153  // Only a stream with very high resolution and perverse parameters could
154  // get near that, though, so set a lower limit here with the maximum
155  // possible value for 4K video (at most 135 16x16 Ctb rows).
157 };
158 
159 
160 #endif /* AVCODEC_HEVC_H */
HEVCNALUnitType
Table 7-1 – NAL unit type codes and NAL unit type classes in T-REC-H.265-201802. ...
Definition: hevc.h:28
HEVCSliceType
Definition: hevc.h:95