333 lines
8.7 KiB
Go
333 lines
8.7 KiB
Go
package extract
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import (
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"encoding/binary"
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"errors"
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"fmt"
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"math"
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"os"
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"strings"
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"time"
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"github.com/sirupsen/logrus"
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log "github.com/sirupsen/logrus"
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)
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// 每行传感器数据帧头信息长度为24字节
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type AuxFrameHead struct {
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PkgHead [4]byte // 包头头标识符，固定为0xD15BD15B
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FillByte0 byte // 填充字节 0x00
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FrmHead [6]byte // 帧头标识符，固定为0xEB90EB90EB90
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// 图像模式
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// B7 模式标识 000：为线阵模式
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// B6
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// B5
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// B4 B4谱状态 0：不输出1：输出
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// B3 B3谱状态 0：不输出1：输出
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// B2 B2谱状态 0：不输出1：输出
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// B1 B1谱状态 0：不输出1：输出
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// B0 全色状态 0：不输出1：输出
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ImgMode byte
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SerialNo uint32 // 当前流水号
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TimeSec uint32 // 时间（秒）
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TimeSecFrac uint32 // 秒小数 量纲：1us/bit，十六进制无符号整型数
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FileNo uint8 // 文件号
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IsValidFrmHead bool
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B0 bool
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B1 bool
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B2 bool
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B3 bool
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B4 bool
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IsLinerMatrix bool
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RowLength int
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}
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func (afh *AuxFrameHead) Decode(data []byte) error {
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if len(data) < 24 {
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return errors.New("length of AuxFrameHead is not 24")
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}
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afh.PkgHead = [4]byte{data[0], data[1], data[2], data[3]}
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afh.FillByte0 = data[4]
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afh.FrmHead = [6]byte{data[5], data[6], data[7], data[8], data[9], data[10]}
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afh.ImgMode = data[11]
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afh.B0 = (afh.ImgMode&(1<<0) != 0x0)
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afh.B1 = (afh.ImgMode&(1<<1) != 0x0)
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afh.B2 = (afh.ImgMode&(1<<2) != 0x0)
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afh.B3 = (afh.ImgMode&(1<<3) != 0x0)
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afh.B4 = (afh.ImgMode&(1<<4) != 0x0)
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afh.IsLinerMatrix = (afh.ImgMode&(1<<5) == 0x0 && afh.ImgMode&(1<<6) == 0x0 && afh.ImgMode&(1<<7) == 0x0)
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afh.SerialNo = binary.BigEndian.Uint32(data[12:16])
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afh.TimeSec = binary.BigEndian.Uint32(data[16:20])
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afh.TimeSecFrac = uint32(uint32(data[20])<<16 | uint32(data[21])<<8 | uint32(data[22]))
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afh.FileNo = data[23]
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afh.RowLength = afh.LengthOfRow()
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afh.IsValidFrmHead = afh.CheckFrmHead()
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return nil
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}
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// 计算一行数据长度：帧头+辅助数据+图像数据
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func (afh AuxFrameHead) LengthOfRow() int {
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if !afh.IsLinerMatrix {
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return 14344
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}
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length := 64 // 帧头+辅助数据长度
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if afh.B0 {
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length += 19040
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}
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if afh.B1 {
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length += 1192
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}
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if afh.B2 {
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length += 1192
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}
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if afh.B3 {
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length += 1192
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}
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if afh.B4 {
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length += 1192
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}
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return length
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}
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func (afh AuxFrameHead) CheckFrmHead() bool {
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if afh.FrmHead[0] == 0xEB && afh.FrmHead[1] == 0x90 &&
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afh.FrmHead[2] == 0xEB && afh.FrmHead[3] == 0x90 &&
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afh.FrmHead[4] == 0xEB && afh.FrmHead[5] == 0x90 {
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return true
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}
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return false
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}
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// 从传输帧文件中分离辅助数据，分别存储到辅助数据文件 _AUX.dat 和图像数据文件 _IMG_{波谱}.dat 中
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func (e *Extractor) SeprateAuxAndImgData(dataFile string, segmentIndex int) error {
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// 打开传输帧文件 - 一次读入内存
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data, err := os.ReadFile(dataFile)
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if err != nil {
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log.Println("read data from", dataFile, "error:", err.Error())
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return err
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}
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log.Info("seprate aux and img data from", dataFile)
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dataLen := len(data)
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log.Info("length of original data: ", dataLen)
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var firstFrmHead *AuxFrameHead
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data, firstFrmHead = e.trimImgRawData(data)
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dataLen = len(data)
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log.Info("after trim,length of data: ", dataLen)
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e.quanlityAnalysis(data)
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outputDir := e.params.OutputPath
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name := strings.Join([]string{
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e.params.Satellite,
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"PMS",
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time.Unix(int64(firstFrmHead.TimeSec)+int64(ReferenceTime2000),
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int64(firstFrmHead.TimeSecFrac)*1000).
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Format("20060102_150405"),
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e.params.DataId,
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fmt.Sprintf("%03d", firstFrmHead.FileNo),
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}, "_")
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lw := newL0Writer(outputDir, name)
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defer lw.Close()
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var panEnviHdr, mssEnviHdr EnviHdr
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var afh AuxFrameHead
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msdata := make([][]byte, 4)
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for i := 0; i < dataLen; {
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if i+4 > dataLen {
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logrus.Println("end of data, dataLen:", dataLen, "i:", i)
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break
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}
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// 包头
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if data[i] == 0xD1 && data[i+1] == 0x5B && data[i+2] == 0xD1 && data[i+3] == 0x5B {
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log.Debug("find package head: 0xD15BD15B")
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} else {
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i++
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continue
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}
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// 解析帧
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if i+24 > dataLen {
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log.Info("length of frame head is not engough for frame head")
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break
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}
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afh.Decode(data[i : i+24])
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if !afh.IsValidFrmHead {
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log.Info("invalid frame head of original raw data")
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i += 1
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continue
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}
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// 目前只支持线阵模式
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if !afh.IsLinerMatrix {
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log.Error("not liner matrix mode, only support liner matrix mode")
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break
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}
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// 读取一行数据 data[i : i+afh.RowLength]
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if i+afh.RowLength > dataLen {
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log.Infof("length of image row data %v is not enough: %v", dataLen-i, afh.RowLength)
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break
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}
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// 存储辅助数据到临时文件
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dataIndex := i + 24
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lw.ws[EB_AUX].w.Write(data[dataIndex : dataIndex+8]) // 8字节焦面电箱辅助数据
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dataIndex += 8
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lw.ws[PLAT_AUX].w.Write(data[dataIndex : dataIndex+32]) // 32字节中心机辅助数据
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dataIndex += 32
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// 存储图像数据到临时文件 - 以 ENVI BSQ 格式存储，同时提供 HDR 描述文件
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if afh.B0 {
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// wpan.Write(data[dataIndex : dataIndex+19040])
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write16bPixelLittleEndian(lw.ws[PAN_RAW].w, data[dataIndex:dataIndex+19040])
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dataIndex += 19040
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panEnviHdr.Lines += 1
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}
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if afh.B1 {
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// write16bPixelLittleEndian(wmss, data[dataIndex:dataIndex+1192])
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msdata[0] = append(msdata[0], data[dataIndex:dataIndex+1192]...)
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dataIndex += 1192
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mssEnviHdr.Lines += 1
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}
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if afh.B2 {
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// write16bPixelLittleEndian(wmss, data[dataIndex:dataIndex+1192])
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msdata[1] = append(msdata[1], data[dataIndex:dataIndex+1192]...)
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dataIndex += 1192
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}
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if afh.B3 {
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// write16bPixelLittleEndian(wmss, data[dataIndex:dataIndex+1192])
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msdata[2] = append(msdata[2], data[dataIndex:dataIndex+1192]...)
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dataIndex += 1192
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}
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if afh.B4 {
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// write16bPixelLittleEndian(wmss, data[dataIndex:dataIndex+1192])
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msdata[3] = append(msdata[3], data[dataIndex:dataIndex+1192]...)
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dataIndex += 1192
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}
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i = dataIndex // 完成一行数据解析
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}
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var bands = 0
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for i := 0; i < 4; i++ {
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if len(msdata[i]) > 0 {
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log.Println("write mss data of band B", i+1)
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_, err := write16bPixelLittleEndian(lw.ws[MSS_RAW].w, msdata[i])
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if err != nil {
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log.Error("write mss data error:", err.Error())
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}
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bands += 1
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}
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}
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panEnviHdr.Samples = 9520
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panEnviHdr.Bands = 1
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lw.ws[PAN_HDR].w.Write([]byte(panEnviHdr.String()))
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mssEnviHdr.Lines = mssEnviHdr.Lines / 4 // 多光谱波段分别在 4 行中传输
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mssEnviHdr.Samples = 2384
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mssEnviHdr.Bands = bands
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lw.ws[MSS_HDR].w.Write([]byte(mssEnviHdr.String()))
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return nil
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}
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func (e *Extractor) quanlityAnalysis(data []byte) {
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// 数据质量分析
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fimg, _ := os.Create("demo/temp/" + e.params.DataId + "_aux_img.txt")
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defer fimg.Close()
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fimg.WriteString("字节数 帧头流水号 文件号 帧头时间 中心辅助数据前4字节(行33-36)\n")
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var startAuxLine bool
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var preSN uint32
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for i := 0; i < len(data); {
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afh := &AuxFrameHead{}
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afh.Decode(data[i : i+24])
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if !afh.IsValidFrmHead {
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log.Errorf("invalid frame head of original raw data i: %v, len: %v", i, len(data))
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return
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}
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t := time.Unix(int64(afh.TimeSec+uint32(ReferenceTime2000)), int64(afh.TimeSecFrac)*1000)
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utcTime := binary.BigEndian.Uint32(data[i+32 : i+36])
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tAux := time.Unix(int64(utcTime+uint32(ReferenceTime2000)), 0)
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startAuxLine = math.Abs(float64(utcTime)-float64(afh.TimeSec)) < 30
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if startAuxLine {
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fimg.WriteString(fmt.Sprintf("%d %d %d %s %s\n",
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i,
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afh.SerialNo,
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afh.FileNo,
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t.String(),
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tAux.String(),
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))
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if afh.SerialNo-preSN != 16 && preSN != 0 {
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log.Println("serial number not continuous", afh.SerialNo, preSN)
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}
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preSN = afh.SerialNo
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}
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i += afh.RowLength
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}
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}
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// 裁剪图像数据，只保留有效数据
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func (e *Extractor) trimImgRawData(data []byte) ([]byte, *AuxFrameHead) {
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var start, end int
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afh := &AuxFrameHead{}
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// 将中心辅助数据时间合理的帧作为第一帧
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var startAuxLine bool
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for i := 0; i < len(data); {
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// 解析帧
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if i+24 > len(data) {
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log.Info("length of original image frame head is not engough: ", len(data)-i)
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break
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}
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if data[i] == 0xD1 && data[i+1] == 0x5B && data[i+2] == 0xD1 && data[i+3] == 0x5B {
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log.Debug("find package head: 0xD15BD15B")
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} else {
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i++
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continue
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}
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afh.Decode(data[i : i+24])
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if !afh.IsValidFrmHead {
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log.Debugf("invalid frame head of original raw data %v", i)
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i += 1
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continue
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}
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utcTime := binary.BigEndian.Uint32(data[i+32 : i+36]) // 相对于2000年的秒数
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startAuxLine = math.Abs(float64(utcTime)-float64(afh.TimeSec)) < 30 // 时间差小于30秒认为是有效数据
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if !startAuxLine {
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i += afh.RowLength
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} else {
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start = i
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nLen := (len(data) - i - 1)
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nLen = nLen - nLen%(afh.RowLength*16)
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end = i + nLen
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break
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}
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}
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return data[start:end], afh
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}
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