1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 /**
20 * @file
21 * H.264 common definitions
22 */
23
24 #ifndef AVCODEC_H264_H
25 #define AVCODEC_H264_H
26
27 #define QP_MAX_NUM (51 + 6*6) // The maximum supported qp
28
29 /*
30 * Table 7-1 – NAL unit type codes, syntax element categories, and NAL unit type classes in
31 * T-REC-H.264-201704
32 */
33 enum {
66 };
67
68
69 enum {
70 // 7.4.2.1.1: seq_parameter_set_id is in [0, 31].
72 // 7.4.2.2: pic_parameter_set_id is in [0, 255].
74
75 // A.3: MaxDpbFrames is bounded above by 16.
77 // 7.4.2.1.1: max_num_ref_frames is in [0, MaxDpbFrames], and
78 // each reference frame can have two fields.
80
81 // 7.4.3.1: modification_of_pic_nums_idc is not equal to 3 at most
82 // num_ref_idx_lN_active_minus1 + 1 times (that is, once for each
83 // possible reference), then equal to 3 once.
85
86 // 7.4.3.3: in the worst case, we begin with a full short-term
87 // reference picture list. Each picture in turn is moved to the
88 // long-term list (type 3) and then discarded from there (type 2).
89 // Then, we set the length of the long-term list (type 4), mark
90 // the current picture as long-term (type 6) and terminate the
91 // process (type 0).
93
94 // A.2.1, A.2.3: profiles supporting FMO constrain
95 // num_slice_groups_minus1 to be in [0, 7].
97
98 // E.2.2: cpb_cnt_minus1 is in [0, 31].
100
101 // A.3: in table A-1 the highest level allows a MaxFS of 139264.
103 // A.3.1, A.3.2: PicWidthInMbs and PicHeightInMbs are constrained
104 // to be not greater than sqrt(MaxFS * 8). Hence height/width are
105 // bounded above by sqrt(139264 * 8) = 1055.5 macroblocks.
110 };
111
112
113 #endif /* AVCODEC_H264_H */