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https://github.com/Monibuca/engine.git
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145 lines
5.0 KiB
Go
145 lines
5.0 KiB
Go
package avformat
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import (
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"io"
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)
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// Start Code + NAL Unit -> NALU Header + NALU Body
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// RTP Packet -> NALU Header + NALU Body
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// NALU Body -> Slice Header + Slice data
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// Slice data -> flags + Macroblock layer1 + Macroblock layer2 + ...
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// Macroblock layer1 -> mb_type + PCM Data
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// Macroblock layer2 -> mb_type + Sub_mb_pred or mb_pred + Residual Data
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// Residual Data ->
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const (
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// NALU Type
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NALU_Unspecified = 0
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NALU_Non_IDR_Picture = 1
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NALU_Data_Partition_A = 2
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NALU_Data_Partition_B = 3
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NALU_Data_Partition_C = 4
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NALU_IDR_Picture = 5
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NALU_SEI = 6
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NALU_SPS = 7
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NALU_PPS = 8
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NALU_Access_Unit_Delimiter = 9
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NALU_Sequence_End = 10
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NALU_Stream_End = 11
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NALU_Filler_Data = 12
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NALU_SPS_Extension = 13
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NALU_Prefix = 14
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NALU_SPS_Subset = 15
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NALU_DPS = 16
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NALU_Reserved1 = 17
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NALU_Reserved2 = 18
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NALU_Not_Auxiliary_Coded = 19
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NALU_Coded_Slice_Extension = 20
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NALU_Reserved3 = 21
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NALU_Reserved4 = 22
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NALU_Reserved5 = 23
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NALU_NotReserved = 24
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// 24 - 31 NALU_NotReserved
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)
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var (
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NALU_AUD_BYTE = []byte{0x00, 0x00, 0x00, 0x01, 0x09, 0xF0}
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NALU_Delimiter1 = []byte{0x00, 0x00, 0x01}
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NALU_Delimiter2 = []byte{0x00, 0x00, 0x00, 0x01}
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RTMP_AVC_HEAD = []byte{0x17, 0x00, 0x00, 0x00, 0x00, 0x01, 0x42, 0x00, 0x1E, 0xFF}
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RTMP_KEYFRAME_HEAD = []byte{0x17, 0x01, 0x00, 0x00, 0x00}
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RTMP_NORMALFRAME_HEAD = []byte{0x27, 0x01, 0x00, 0x00, 0x00}
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)
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var NALU_SEI_BYTE []byte
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// H.264/AVC视频编码标准中,整个系统框架被分为了两个层面:视频编码层面(VCL)和网络抽象层面(NAL)
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// NAL - Network Abstract Layer
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// raw byte sequence payload (RBSP) 原始字节序列载荷
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type H264 struct {
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}
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type NALUnit struct {
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NALUHeader
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RBSP
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}
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type NALUHeader struct {
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forbidden_zero_bit byte // 1 bit 0
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nal_ref_idc byte // 2 bits nal_unit_type等于6,9,10,11或12的NAL单元其nal_ref_idc都应等于 0
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nal_uint_type byte // 5 bits 包含在 NAL 单元中的 RBSP 数据结构的类型
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}
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type RBSP interface {
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}
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/*
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0 Unspecified non-VCL
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1 Coded slice of a non-IDR picture VCL
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2 Coded slice data partition A VCL
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3 Coded slice data partition B VCL
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4 Coded slice data partition C VCL
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5 Coded slice of an IDR picture VCL
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6 Supplemental enhancement information (SEI) non-VCL
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7 Sequence parameter set non-VCL
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8 Picture parameter set non-VCL
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9 Access unit delimiter non-VCL
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10 End of sequence non-VCL
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11 End of stream non-VCL
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12 Filler data non-VCL
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13 Sequence parameter set extension non-VCL
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14 Prefix NAL unit non-VCL
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15 Subset sequence parameter set non-VCL
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16 Depth parameter set non-VCL
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17..18 Reserved non-VCL
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19 Coded slice of an auxiliary coded picture without partitioning non-VCL
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20 Coded slice extension non-VCL
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21 Coded slice extension for depth view components non-VCL
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22..23 Reserved non-VCL
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24..31 Unspecified non-VCL
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0:未规定
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1:非IDR图像中不采用数据划分的片段
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2:非IDR图像中A类数据划分片段
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3:非IDR图像中B类数据划分片段
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4:非IDR图像中C类数据划分片段
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5:IDR图像的片段
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6:补充增强信息（SEI）
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7:序列参数集（SPS）
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8:图像参数集（PPS）
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9:分割符
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10:序列结束符
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11:流结束符
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12:填充数据
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13:序列参数集扩展
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14:带前缀的NAL单元
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15:子序列参数集
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16 – 18:保留
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19:不采用数据划分的辅助编码图像片段
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20:编码片段扩展
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21 – 23:保留
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24 – 31:未规定
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nal_unit_type NAL类型 nal_reference_bit
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0 未使用 0
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1 非IDR的片 此片属于参考帧,则不等于0,不属于参考帧，则等与0
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2 片数据A分区 同上
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3 片数据B分区 同上
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4 片数据C分区 同上
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5 IDR图像的片 5
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6 补充增强信息单元（SEI） 0
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7 序列参数集 非0
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8 图像参数集 非0
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9 分界符 0
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10 序列结束 0
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11 码流结束 0
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12 填充 0
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13..23 保留 0
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24..31 不保留 0
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*/
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func ReadPPS(w io.Writer) {
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}
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