FFmpeg
libavcodec
h264.h
Go to the documentation of this file.
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/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* H.264 common definitions
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*/
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#ifndef AVCODEC_H264_H
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#define AVCODEC_H264_H
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#define QP_MAX_NUM (51 + 6*6) // The maximum supported qp
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/*
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* Table 7-1 – NAL unit type codes, syntax element categories, and NAL unit type classes in
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* T-REC-H.264-201704
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*/
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enum
{
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H264_NAL_UNSPECIFIED
= 0,
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H264_NAL_SLICE
= 1,
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H264_NAL_DPA
= 2,
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H264_NAL_DPB
= 3,
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H264_NAL_DPC
= 4,
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H264_NAL_IDR_SLICE
= 5,
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H264_NAL_SEI
= 6,
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H264_NAL_SPS
= 7,
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H264_NAL_PPS
= 8,
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H264_NAL_AUD
= 9,
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H264_NAL_END_SEQUENCE
= 10,
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H264_NAL_END_STREAM
= 11,
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H264_NAL_FILLER_DATA
= 12,
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H264_NAL_SPS_EXT
= 13,
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H264_NAL_PREFIX
= 14,
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H264_NAL_SUB_SPS
= 15,
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H264_NAL_DPS
= 16,
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H264_NAL_RESERVED17
= 17,
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H264_NAL_RESERVED18
= 18,
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H264_NAL_AUXILIARY_SLICE
= 19,
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H264_NAL_EXTEN_SLICE
= 20,
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H264_NAL_DEPTH_EXTEN_SLICE
= 21,
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H264_NAL_RESERVED22
= 22,
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H264_NAL_RESERVED23
= 23,
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H264_NAL_UNSPECIFIED24
= 24,
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H264_NAL_UNSPECIFIED25
= 25,
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H264_NAL_UNSPECIFIED26
= 26,
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H264_NAL_UNSPECIFIED27
= 27,
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H264_NAL_UNSPECIFIED28
= 28,
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H264_NAL_UNSPECIFIED29
= 29,
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H264_NAL_UNSPECIFIED30
= 30,
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H264_NAL_UNSPECIFIED31
= 31,
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};
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enum
{
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// 7.4.2.1.1: seq_parameter_set_id is in [0, 31].
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H264_MAX_SPS_COUNT
= 32,
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// 7.4.2.2: pic_parameter_set_id is in [0, 255].
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H264_MAX_PPS_COUNT
= 256,
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// A.3: MaxDpbFrames is bounded above by 16.
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H264_MAX_DPB_FRAMES
= 16,
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// 7.4.2.1.1: max_num_ref_frames is in [0, MaxDpbFrames], and
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// each reference frame can have two fields.
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H264_MAX_REFS
= 2 *
H264_MAX_DPB_FRAMES
,
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// 7.4.3.1: modification_of_pic_nums_idc is not equal to 3 at most
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// num_ref_idx_lN_active_minus1 + 1 times (that is, once for each
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// possible reference), then equal to 3 once.
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H264_MAX_RPLM_COUNT
=
H264_MAX_REFS
+ 1,
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// 7.4.3.3: in the worst case, we begin with a full short-term
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// reference picture list. Each picture in turn is moved to the
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// long-term list (type 3) and then discarded from there (type 2).
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// Then, we set the length of the long-term list (type 4), mark
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// the current picture as long-term (type 6) and terminate the
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// process (type 0).
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H264_MAX_MMCO_COUNT
=
H264_MAX_REFS
* 2 + 3,
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// A.2.1, A.2.3: profiles supporting FMO constrain
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// num_slice_groups_minus1 to be in [0, 7].
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H264_MAX_SLICE_GROUPS
= 8,
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// E.2.2: cpb_cnt_minus1 is in [0, 31].
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H264_MAX_CPB_CNT
= 32,
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// A.3: in table A-1 the highest level allows a MaxFS of 139264.
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H264_MAX_MB_PIC_SIZE
= 139264,
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// A.3.1, A.3.2: PicWidthInMbs and PicHeightInMbs are constrained
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// to be not greater than sqrt(MaxFS * 8). Hence height/width are
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// bounded above by sqrt(139264 * 8) = 1055.5 macroblocks.
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H264_MAX_MB_WIDTH
= 1055,
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H264_MAX_MB_HEIGHT
= 1055,
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H264_MAX_WIDTH
=
H264_MAX_MB_WIDTH
* 16,
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H264_MAX_HEIGHT
=
H264_MAX_MB_HEIGHT
* 16,
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};
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#endif
/* AVCODEC_H264_H */
H264_NAL_EXTEN_SLICE
@ H264_NAL_EXTEN_SLICE
Definition:
h264.h:54
H264_MAX_RPLM_COUNT
@ H264_MAX_RPLM_COUNT
Definition:
h264.h:84
H264_MAX_MMCO_COUNT
@ H264_MAX_MMCO_COUNT
Definition:
h264.h:92
H264_NAL_SLICE
@ H264_NAL_SLICE
Definition:
h264.h:35
H264_MAX_MB_HEIGHT
@ H264_MAX_MB_HEIGHT
Definition:
h264.h:107
H264_NAL_UNSPECIFIED30
@ H264_NAL_UNSPECIFIED30
Definition:
h264.h:64
H264_NAL_SEI
@ H264_NAL_SEI
Definition:
h264.h:40
H264_NAL_END_SEQUENCE
@ H264_NAL_END_SEQUENCE
Definition:
h264.h:44
H264_NAL_DPA
@ H264_NAL_DPA
Definition:
h264.h:36
H264_NAL_SPS_EXT
@ H264_NAL_SPS_EXT
Definition:
h264.h:47
H264_NAL_PPS
@ H264_NAL_PPS
Definition:
h264.h:42
H264_NAL_DPS
@ H264_NAL_DPS
Definition:
h264.h:50
H264_NAL_END_STREAM
@ H264_NAL_END_STREAM
Definition:
h264.h:45
H264_NAL_DEPTH_EXTEN_SLICE
@ H264_NAL_DEPTH_EXTEN_SLICE
Definition:
h264.h:55
H264_NAL_RESERVED22
@ H264_NAL_RESERVED22
Definition:
h264.h:56
H264_NAL_SUB_SPS
@ H264_NAL_SUB_SPS
Definition:
h264.h:49
H264_MAX_WIDTH
@ H264_MAX_WIDTH
Definition:
h264.h:108
H264_NAL_RESERVED17
@ H264_NAL_RESERVED17
Definition:
h264.h:51
H264_NAL_DPC
@ H264_NAL_DPC
Definition:
h264.h:38
H264_NAL_UNSPECIFIED27
@ H264_NAL_UNSPECIFIED27
Definition:
h264.h:61
H264_MAX_CPB_CNT
@ H264_MAX_CPB_CNT
Definition:
h264.h:99
H264_NAL_UNSPECIFIED25
@ H264_NAL_UNSPECIFIED25
Definition:
h264.h:59
H264_NAL_RESERVED23
@ H264_NAL_RESERVED23
Definition:
h264.h:57
H264_MAX_DPB_FRAMES
@ H264_MAX_DPB_FRAMES
Definition:
h264.h:76
H264_NAL_RESERVED18
@ H264_NAL_RESERVED18
Definition:
h264.h:52
H264_NAL_UNSPECIFIED29
@ H264_NAL_UNSPECIFIED29
Definition:
h264.h:63
H264_MAX_MB_PIC_SIZE
@ H264_MAX_MB_PIC_SIZE
Definition:
h264.h:102
H264_MAX_MB_WIDTH
@ H264_MAX_MB_WIDTH
Definition:
h264.h:106
H264_NAL_AUXILIARY_SLICE
@ H264_NAL_AUXILIARY_SLICE
Definition:
h264.h:53
H264_MAX_SPS_COUNT
@ H264_MAX_SPS_COUNT
Definition:
h264.h:71
H264_NAL_IDR_SLICE
@ H264_NAL_IDR_SLICE
Definition:
h264.h:39
H264_NAL_UNSPECIFIED
@ H264_NAL_UNSPECIFIED
Definition:
h264.h:34
H264_MAX_HEIGHT
@ H264_MAX_HEIGHT
Definition:
h264.h:109
H264_NAL_DPB
@ H264_NAL_DPB
Definition:
h264.h:37
H264_NAL_AUD
@ H264_NAL_AUD
Definition:
h264.h:43
H264_NAL_FILLER_DATA
@ H264_NAL_FILLER_DATA
Definition:
h264.h:46
H264_NAL_UNSPECIFIED26
@ H264_NAL_UNSPECIFIED26
Definition:
h264.h:60
H264_MAX_PPS_COUNT
@ H264_MAX_PPS_COUNT
Definition:
h264.h:73
H264_NAL_UNSPECIFIED31
@ H264_NAL_UNSPECIFIED31
Definition:
h264.h:65
H264_NAL_UNSPECIFIED24
@ H264_NAL_UNSPECIFIED24
Definition:
h264.h:58
H264_MAX_SLICE_GROUPS
@ H264_MAX_SLICE_GROUPS
Definition:
h264.h:96
H264_NAL_UNSPECIFIED28
@ H264_NAL_UNSPECIFIED28
Definition:
h264.h:62
H264_MAX_REFS
@ H264_MAX_REFS
Definition:
h264.h:79
H264_NAL_SPS
@ H264_NAL_SPS
Definition:
h264.h:41
H264_NAL_PREFIX
@ H264_NAL_PREFIX
Definition:
h264.h:48
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