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 */ 33enum { 34 H264_NAL_UNSPECIFIED = 0, 35 H264_NAL_SLICE = 1, 36 H264_NAL_DPA = 2, 37 H264_NAL_DPB = 3, 38 H264_NAL_DPC = 4, 39 H264_NAL_IDR_SLICE = 5, 40 H264_NAL_SEI = 6, 41 H264_NAL_SPS = 7, 42 H264_NAL_PPS = 8, 43 H264_NAL_AUD = 9, 44 H264_NAL_END_SEQUENCE = 10, 45 H264_NAL_END_STREAM = 11, 46 H264_NAL_FILLER_DATA = 12, 47 H264_NAL_SPS_EXT = 13, 48 H264_NAL_PREFIX = 14, 49 H264_NAL_SUB_SPS = 15, 50 H264_NAL_DPS = 16, 51 H264_NAL_RESERVED17 = 17, 52 H264_NAL_RESERVED18 = 18, 53 H264_NAL_AUXILIARY_SLICE = 19, 54 H264_NAL_EXTEN_SLICE = 20, 55 H264_NAL_DEPTH_EXTEN_SLICE = 21, 56 H264_NAL_RESERVED22 = 22, 57 H264_NAL_RESERVED23 = 23, 58 H264_NAL_UNSPECIFIED24 = 24, 59 H264_NAL_UNSPECIFIED25 = 25, 60 H264_NAL_UNSPECIFIED26 = 26, 61 H264_NAL_UNSPECIFIED27 = 27, 62 H264_NAL_UNSPECIFIED28 = 28, 63 H264_NAL_UNSPECIFIED29 = 29, 64 H264_NAL_UNSPECIFIED30 = 30, 65 H264_NAL_UNSPECIFIED31 = 31, 66}; 67 68 69enum { 70 // 7.4.2.1.1: seq_parameter_set_id is in [0, 31]. 71 H264_MAX_SPS_COUNT = 32, 72 // 7.4.2.2: pic_parameter_set_id is in [0, 255]. 73 H264_MAX_PPS_COUNT = 256, 74 75 // A.3: MaxDpbFrames is bounded above by 16. 76 H264_MAX_DPB_FRAMES = 16, 77 // 7.4.2.1.1: max_num_ref_frames is in [0, MaxDpbFrames], and 78 // each reference frame can have two fields. 79 H264_MAX_REFS = 2 * H264_MAX_DPB_FRAMES, 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. 84 H264_MAX_RPLM_COUNT = H264_MAX_REFS + 1, 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). 92 H264_MAX_MMCO_COUNT = H264_MAX_REFS * 2 + 3, 93 94 // A.2.1, A.2.3: profiles supporting FMO constrain 95 // num_slice_groups_minus1 to be in [0, 7]. 96 H264_MAX_SLICE_GROUPS = 8, 97 98 // E.2.2: cpb_cnt_minus1 is in [0, 31]. 99 H264_MAX_CPB_CNT = 32, 100 101 // A.3: in table A-1 the highest level allows a MaxFS of 139264. 102 H264_MAX_MB_PIC_SIZE = 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. 106 H264_MAX_MB_WIDTH = 1055, 107 H264_MAX_MB_HEIGHT = 1055, 108 H264_MAX_WIDTH = H264_MAX_MB_WIDTH * 16, 109 H264_MAX_HEIGHT = H264_MAX_MB_HEIGHT * 16, 110}; 111 112 113#endif /* AVCODEC_H264_H */ 114