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128 lines
4.0 KiB
Go
Executable File
128 lines
4.0 KiB
Go
Executable File
// Copyright (c) 2019,CAOHONGJU All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package h264
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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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// H264 NAL 单元类型
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const (
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NalUnspecified = 0
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NalSlice = 1 // 不分区非IDR图像的片
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NalDpa = 2 // 片分区A
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NalDpb = 3 // 片分区B
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NalDpc = 4 // 片分区C
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NalIdrSlice = 5 // IDR图像中的片（I帧）
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NalSei = 6 // 补充增强信息单元，sei playload可以使用户自定义数据， 那么我们就可以利用它来传输数据
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NalSps = 7 // 序列参数集
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NalPps = 8 // 图像参数集
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NalAud = 9 // 分界符
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NalEndSequence = 10 // 序列结束
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NalEndStream = 11 // 码流结束
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NalFillerData = 12 // 填充
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NalSpsExt = 13 //
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NalPrefix = 14
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NalSubSps = 15
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NalDps = 16
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NalReserved17 = 17
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NalReserved18 = 18
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NalAuxiliarySlice = 19
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NalExtenSlice = 20
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NalDepthExtenSlice = 21
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NalReserved22 = 22
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NalReserved23 = 23
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NalUnspecified24 = 24
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NalUnspecified25 = 25
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NalUnspecified26 = 26
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NalUnspecified27 = 27
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NalUnspecified28 = 28
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NalUnspecified29 = 29
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NalUnspecified30 = 30
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NalUnspecified31 = 31
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// NAL 在 RTP 包中的扩展
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NalStapaInRtp = 24 // 单一时间的组合包
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NalStapbInRtp = 25 // 单一时间的组合包
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NalMtap16InRtp = 26 // 多个时间的组合包
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NalMtap24InRtp = 27 // 多个时间的组合包
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NalFuAInRtp = 28 // 分片的单元
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NalFuBInRtp = 29 // 分片的单元
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NalTypeBitmask = 0x1F
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)
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// Profile
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const (
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ProfileConstrained = (1 << 9) // 8+1; constraint_set1_flag
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ProfileIntra = (1 << 11) // 8+3; constraint_set3_flag
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ProfileBaseline = 66
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ProfileConstrainedBaseline = (66 | ProfileConstrained)
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ProfileMain = 77
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ProfileExtended = 88
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ProfileHigh = 100
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ProfileHigh10 = 110
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ProfileHigh10Intra = (110 | ProfileIntra)
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ProfileMultiViewHigh = 118
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ProfileHigh422 = 122
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ProfileHigh422Intra = (122 | ProfileIntra)
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ProfileStereoHigh = 128
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ProfileHigh444 = 144
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ProfileHigh444Predictive = 244
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ProfileHigh444Intra = (244 | ProfileIntra)
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ProfileCAVLC444 = 44
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)
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// 参数集索引
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const (
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ParameterSetSps = iota
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ParameterSetPps
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)
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// 其他常量
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const (
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// 7.4.2.1.1: seq_parameter_set_id is in [0, 31].
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MaxSpsCount = 32
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// 7.4.2.2: pic_parameter_set_id is in [0, 255].
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MaxPpsCount = 256
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// A.3: MaxDpbFrames is bounded above by 16.
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MaxDpbFrames = 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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MaxRefs = 2 * MaxDpbFrames
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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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MaxRplmCount = MaxRefs + 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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MaxMmcoCount = MaxRefs*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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MaxSliceGroups = 8
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// E.2.2: cpb_cnt_minus1 is in [0, 31].
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MaxCpbCnt = 32
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// A.3: in table A-1 the highest level allows a MaxFS of 139264.
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MaxMbPicSize = 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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MaxMbWidth = 1055
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MaxMbHeight = 1055
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MaxWidth = MaxMbWidth * 16
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MaxHeight = MaxMbHeight * 16
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)
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