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/libavcodec/h264.h

http://github.com/FFmpeg/FFmpeg
C Header | 113 lines | 53 code | 14 blank | 46 comment | 0 complexity | 5b6dcb38f66b7534610343cdf9647748 MD5 | raw file
  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 */