kopia lustrzana https://github.com/N0BOY/FT8CN
546 wiersze
23 KiB
Java
546 wiersze
23 KiB
Java
package com.bg7yoz.ft8cn.flex;
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/**
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* VITA49协议的简单解包和封包操作。此库停止维护，将使用VITA49.java替换此库。
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*
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* @author BGY70Z
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* @date 2023-03-20
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*/
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/*
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public static intVH_PKT_TYPE(x) ((x & 0xF0000000) >> 28)
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public static intVH_C(x) ((x & 0x08000000) >> 26)
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public static intVH_T(x) ((x & 0x04000000) >> 25)
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public static intVH_TSI(x) ((x & 0x00c00000) >> 21)
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public static intVH_TSF(x) ((x & 0x00300000) >> 19)
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public static intVH_PKT_CNT(x) ((x & 0x000f0000) >> 16)
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public static intVH_PKT_SIZE(x) (x & 0x0000ffff)
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*/
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// Enumerates for field values
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import android.annotation.SuppressLint;
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import java.nio.ByteBuffer;
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public class VITA {
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private static final String TAG = "VITA";
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// 最小有效的VITA包长度
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private static final int VITAmin = 28;
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public static final int FRS_OUI = 0x12cd;
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//public static final int VITA_PORT = 4991;
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public static final int FLEX_CLASS_ID = 0x534C;
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public static final int FLEX_DAX_AUDIO_CLASS_ID = 0x534C03E3;
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public static final int FLEX_DAX_IQ_CLASS_ID = 0x534C00E3;
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public static final int FLEX_FFT_CLASS_ID = 0x534C8003;
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public static final int FLEX_METER_CLASS_ID = 0x534C8002;
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public static final int FLEX_Discovery_stream_ID = 0x800;
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public static final int VS_Meter = 0x8002;
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public static final int VS_PAN_FFT = 0x8003;
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public static final int VS_Waterfall = 0x8004;
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public static final int VS_Opus = 0x8005;
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public static final int DAX_IQ_24Khz = 0x00e3;
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public static final int DAX_IQ_48Khz = 0x00e4;
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public static final int DAX_IQ_96Khz = 0x00e5;
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public static final int DAX_IQ_192KHz = 0x00e6;
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public static final int VS_DAX_Audio = 0x03e3;
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public static final int VS_Discovery = 0xffff;
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//与x6100有关的id信息
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public static final long XIEGU_Discovery_Class_Id = 0x005849454755FFFFL;
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public static final int XIEGU_Discovery_Stream_Id = 0x00000800;
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public static final long XIEGU_AUDIO_CLASS_ID = 0x00584945475500A1L;
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public static final int XIEGU_PING_Stream_Id= 0x00000600;
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public static final long XIEGU_PING_CLASS_ID = 0x58494547550006L;
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public static final long XIEGU_METER_CLASS_ID = 0x58494547550007L;
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public static final int XIEGU_METER_Stream_Id= 0x00000700;
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private byte[] buffer;
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public boolean streamIdPresent;//是否有流字符
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public VitaPacketType packetType;
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public boolean classIdPresent;//指示数据包中是否包含类标识符（类ID）字段
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public boolean trailerPresent;//指示数据包是否包含尾部。
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public VitaTSI tsi;//时间戳的类型。
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public VitaTSF tsf;//时间戳小数部分类型
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public int packetCount;//包计数器，可以对连续的IF data packet进行计数，这些packet具有相同的Stream Identifier 和packet type。
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public int packetSize;//表示有多少32bit数在IF Data packet 里面
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public int streamId;//流ID，32位
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//时间戳共有两部分，小数部分和整数部分，整数部分以秒为分辨率，32位，小数部分64位。
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public int integerTimestamp;//u_int32，long是64位的
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public long fracTimeStamp;
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public long oui;
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public int informationClassCode;//无用了，用classId代替
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public int packetClassCode;//无用了，用classId代替
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public int classId;//FLEX应该是0x534CFFF，是informationClassCode与packetClassCode合并的
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public long classId64;
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public byte[] payload = null;
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public long trailer;
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public boolean isAvailable = false;//电台对象是否有效。
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/**
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* 设置vita数据包的头部
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* @param packet 数据包
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* @return 数据包
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*/
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public byte[] setVitaPacketHeader(byte[] packet){
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if (packet.length < 28) return packet;
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packet[0] = (byte) (packetType.ordinal() << 4);//packetType
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if (classIdPresent) packet[0] |=0x08;
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if (trailerPresent) packet[0] |= 0x04;
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packet[1] = (byte) (packetCount & 0xf);//packet count
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packet[1] |= (byte) (tsi.ordinal() << 6);//TSI
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packet[1] |= (byte) (tsf.ordinal() << 4);//TSF
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packet[2] = (byte) ((packetSize & 0xff00 ) >> 8 & 0xff);//packetSize 1（高8位）
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packet[3] = (byte) (packetSize & 0xff);//packetSize 2（低8位）
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//-----Stream Identifier--No.2 word----
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packet[4] = (byte) (((streamId & 0x00ff000000) >> 24) & 0xff);
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packet[5] = (byte) (((streamId & 0x0000ff0000) >> 16) & 0xff);
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packet[6] = (byte) (((streamId & 0x000000ff00) >> 8) & 0xff);
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packet[7] = (byte) (streamId & 0x00000000ff);
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//----Class ID--No.3 words----
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packet[8] = 0x00;
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packet[9] = (byte)(((classId64 & 0x00ff000000000000L) >> 48)& 0xff);
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packet[10] =(byte)(((classId64 & 0x0000ff0000000000L) >> 40)& 0xff);
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packet[11] =(byte)(((classId64 & 0x000000ff00000000L) >> 32)& 0xff);
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//---Class ID--No.4 word----
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packet[12] =(byte)(((classId64 & 0x00000000ff000000L) >> 24)& 0xff);
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packet[13] =(byte)(((classId64 & 0x0000000000ff0000L) >> 16)& 0xff);
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packet[14] =(byte)(((classId64 & 0x000000000000ff00L) >> 8)& 0xff);
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packet[15] =(byte)((classId64 & 0x00000000000000ffL ));
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//---Timestamp Int--No.5 word----
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packet[16] =(byte)(((integerTimestamp & 0xff000000) >> 24)& 0xff);
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packet[17] =(byte)(((integerTimestamp & 0x00ff0000) >> 16)& 0xff);
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packet[18] =(byte)(((integerTimestamp & 0x0000ff00) >> 8)& 0xff);
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packet[19] =(byte)(integerTimestamp & 0x000000ff);
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//---Timestamp franc Int--No.6 No.7 word----
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packet[20] = (byte)(((fracTimeStamp & 0xff00000000000000L) >> 56)& 0xff);
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packet[21] = (byte)(((fracTimeStamp & 0x00ff000000000000L) >> 48)& 0xff);
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packet[22] = (byte)(((fracTimeStamp & 0x0000ff0000000000L) >> 40)& 0xff);
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packet[23] = (byte)(((fracTimeStamp & 0x000000ff00000000L) >> 32)& 0xff);
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//---Class ID--No.4 word----
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packet[24] =(byte)(((fracTimeStamp & 0x00000000ff000000L) >> 24)& 0xff);
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packet[25] =(byte)(((fracTimeStamp & 0x0000000000ff0000L) >> 16)& 0xff);
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packet[26] =(byte)(((fracTimeStamp & 0x000000000000ff00L) >> 8)& 0xff);
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packet[27] =(byte)(fracTimeStamp & 0x00000000000000ffL ) ;
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return packet;
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}
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public byte[] pingDataToVita(){
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byte[] result=new byte[28];
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return setVitaPacketHeader(result);
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}
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/**
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* 生成音频流的VITA数据包
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*
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* @param count 包计数器
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* @param payload 音频流数据
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* @return vita数据包
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*/
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public byte[] audioShortDataToVita(int count, short[] payload){
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packetType = VitaPacketType.EXT_DATA_WITH_STREAM;
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classIdPresent = true;
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trailerPresent = false;//没有尾巴
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tsi = VitaTSI.TSI_OTHER;//
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tsf = VitaTSF.TSF_SAMPLE_COUNT;
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this.packetCount = count;
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this.packetSize = (payload.length / 2) + 7;
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byte[] result=new byte[payload.length*2 + 28];
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setVitaPacketHeader(result);
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//----HEADER--No.1 word------
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// result[0] = (byte) (packetType.ordinal() << 4);//packetType
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// if (classIdPresent) result[0] |=0x08;
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// if (trailerPresent) result[0] |= 0x04;
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//
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//
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// result[1] = (byte) (packetCount & 0xf);//packet count
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// result[1] |= (byte) (tsi.ordinal() << 6);//TSI
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// result[1] |= (byte) (tsf.ordinal() << 4);//TSF
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//
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// result[2] = (byte) ((packetSize & 0xff00 ) >> 8 & 0xff);//packetSize 1（高8位）
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// result[3] = (byte) (packetSize & 0xff);//packetSize 2（低8位）
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//
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// //-----Stream Identifier--No.2 word----
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// result[4] = (byte) (((streamId & 0x00ff000000) >> 24) & 0xff);
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// result[5] = (byte) (((streamId & 0x0000ff0000) >> 16) & 0xff);
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// result[6] = (byte) (((streamId & 0x000000ff00) >> 8) & 0xff);
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// result[7] = (byte) (streamId & 0x00000000ff);
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// //----Class ID--No.3 words----
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//
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// result[8] = 0x00;
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// result[9] = (byte)(((classId64 & 0x00ff000000000000L) >> 48)& 0xff);
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// result[10] =(byte)(((classId64 & 0x0000ff0000000000L) >> 40)& 0xff);
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// result[11] =(byte)(((classId64 & 0x000000ff00000000L) >> 32)& 0xff);
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//
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// //---Class ID--No.4 word----
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// result[12] =(byte)(((classId64 & 0x00000000ff000000L) >> 24)& 0xff);
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// result[13] =(byte)(((classId64 & 0x0000000000ff0000L) >> 16)& 0xff);
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// result[14] =(byte)(((classId64 & 0x000000000000ff00L) >> 8)& 0xff);
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// result[15] =(byte)((classId64 & 0x00000000000000ffL ));
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//
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// //---Timestamp Int--No.5 word----
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// result[16] =(byte)(((integerTimestamp & 0xff000000) >> 24)& 0xff);
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// result[17] =(byte)(((integerTimestamp & 0x00ff0000) >> 16)& 0xff);
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// result[18] =(byte)(((integerTimestamp & 0x0000ff00) >> 8)& 0xff);
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// result[19] =(byte)(integerTimestamp & 0x000000ff);
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//
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// //---Timestamp franc Int--No.6 No.7 word----
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// result[20] = (byte)(((fracTimeStamp & 0xff00000000000000L) >> 56)& 0xff);
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// result[21] = (byte)(((fracTimeStamp & 0x00ff000000000000L) >> 48)& 0xff);
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// result[22] = (byte)(((fracTimeStamp & 0x0000ff0000000000L) >> 40)& 0xff);
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// result[23] = (byte)(((fracTimeStamp & 0x000000ff00000000L) >> 32)& 0xff);
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// //---Class ID--No.4 word----
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//
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// result[24] =(byte)(((fracTimeStamp & 0x00000000ff000000L) >> 24)& 0xff);
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// result[25] =(byte)(((fracTimeStamp & 0x0000000000ff0000L) >> 16)& 0xff);
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// result[26] =(byte)(((fracTimeStamp & 0x000000000000ff00L) >> 8)& 0xff);
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// result[27] =(byte)(fracTimeStamp & 0x00000000000000ffL ) ;
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for (int i = 0; i < payload.length ; i++) {
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result[28+i*2]=(byte)(payload[i]&0xff) ;
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result[28+i*2+1]= (byte)((payload[i]>>8)&0xff) ;
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}
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return result;
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}
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/**
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* 生成音频流的VITA数据包，id应当是电台create stream是赋给的
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* @param data 音频流数据
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* @return vita数据包
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*/
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public byte[] audioFloatDataToVita(int count, float[] data) {
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byte[] result = new byte[data.length * 4 + 28];//一个float占用4个字节，28字节是包头的长度7个word
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packetType = VitaPacketType.EXT_DATA_WITH_STREAM;
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classIdPresent = true;
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trailerPresent = false;//没有尾巴
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tsi = VitaTSI.TSI_OTHER;//
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tsf = VitaTSF.TSF_SAMPLE_COUNT;
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this.packetCount = count;
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this.packetSize = (data.length / 2) + 7;
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//----HEADER--No.1 word------
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result[0] = (byte) (packetType.ordinal() << 4);//packetType
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if (classIdPresent) result[0] |=0x08;
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if (trailerPresent) result[0] |= 0x04;
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result[1] = (byte) (packetCount & 0xf);//packet count
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result[1] |= (byte) (tsi.ordinal() << 6);//TSI
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result[1] |= (byte) (tsf.ordinal() << 4);//TSF
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result[2] = (byte) ((packetSize & 0xff00 ) >> 8 & 0xff);//packetSize 1（高8位）
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result[3] = (byte) (packetSize & 0xff);//packetSize 2（低8位）
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//-----Stream Identifier--No.2 word----
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result[4] = (byte) (((streamId & 0x00ff000000) >> 24) & 0xff);
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result[5] = (byte) (((streamId & 0x0000ff0000) >> 16) & 0xff);
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result[6] = (byte) (((streamId & 0x000000ff00) >> 8) & 0xff);
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result[7] = (byte) (streamId & 0x00000000ff);
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//----Class ID--No.3 words----
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result[8] = 0x00;
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result[9] = (byte)(((classId64 & 0x00ff000000000000L) >> 48)& 0xff);
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result[10] =(byte)(((classId64 & 0x0000ff0000000000L) >> 40)& 0xff);
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result[11] =(byte)(((classId64 & 0x000000ff00000000L) >> 32)& 0xff);
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//---Class ID--No.4 word----
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result[12] =(byte)(((classId64 & 0x00000000ff000000L) >> 24)& 0xff);
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result[13] =(byte)(((classId64 & 0x0000000000ff0000L) >> 16)& 0xff);
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result[14] =(byte)(((classId64 & 0x000000000000ff00L) >> 8)& 0xff);
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result[15] =(byte)((classId64 & 0x00000000000000ffL ));
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//---Timestamp Int--No.5 word----
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result[16] =(byte)(((integerTimestamp & 0xff000000) >> 24)& 0xff);
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result[17] =(byte)(((integerTimestamp & 0x00ff0000) >> 16)& 0xff);
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result[18] =(byte)(((integerTimestamp & 0x0000ff00) >> 8)& 0xff);
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result[19] =(byte)(integerTimestamp & 0x000000ff);
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//---Timestamp franc Int--No.6 No.7 word----
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result[20] = (byte)(((fracTimeStamp & 0xff00000000000000L) >> 56)& 0xff);
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result[21] = (byte)(((fracTimeStamp & 0x00ff000000000000L) >> 48)& 0xff);
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result[22] = (byte)(((fracTimeStamp & 0x0000ff0000000000L) >> 40)& 0xff);
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result[23] = (byte)(((fracTimeStamp & 0x000000ff00000000L) >> 32)& 0xff);
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//---Class ID--No.4 word----
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result[24] =(byte)(((fracTimeStamp & 0x00000000ff000000L) >> 24)& 0xff);
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result[25] =(byte)(((fracTimeStamp & 0x0000000000ff0000L) >> 16)& 0xff);
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result[26] =(byte)(((fracTimeStamp & 0x000000000000ff00L) >> 8)& 0xff);
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result[27] =(byte)(fracTimeStamp & 0x00000000000000ffL ) ;
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for (int i = 0; i < data.length; i++) {
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byte[] bytes = ByteBuffer.allocate(4).putFloat(data[i]).array();//float转byte[]
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result[i * 4 + 28] = bytes[0];
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result[i * 4 + 29] = bytes[1];
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result[i * 4 + 30] = bytes[2];
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result[i * 4 + 31] = bytes[3];
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}
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return result;
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}
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public VITA() {
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}
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public VITA( VitaPacketType packetType
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, VitaTSI tsi, VitaTSF tsf
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, int packetCount
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, int streamId, long classId64) {
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this.streamIdPresent = true;
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this.packetType = packetType;
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this.classIdPresent = true;
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this.trailerPresent = false;
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this.tsi = tsi;
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this.tsf = tsf;
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this.packetCount = packetCount;
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this.streamId = streamId;
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this.classId64 = classId64;
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this.isAvailable = true;
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}
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public VITA(byte[] data) {
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this.buffer = data;
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//如果包的长度太小，或包为空，就退出计算
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if (data == null) return;
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if (data.length < VITAmin) return;
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isAvailable = true;//数据长度达到28个字节，说明是有效的。
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packetType = VitaPacketType.values()[(data[0] >> 4) & 0x0f];
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classIdPresent = (data[0] & 0x8) == 0x8;//指示数据包中是否包含类标识符（类ID）字段
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trailerPresent = (data[0] & 0x4) == 0x4;//指示数据包是否包含尾部。
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tsi = VitaTSI.values()[(data[1] >> 6) & 0x3];//如果有时间戳的话指示时间戳的整数部分是啥类型的
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tsf = VitaTSF.values()[(data[1] >> 4) & 0x3];
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packetCount = data[1] & 0x0f;
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packetSize = ((((int) data[2]) & 0x00ff) << 8) | ((int) data[3]) & 0x00ff;
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int offset = 4;//定位
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//检查是否有流字符
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streamIdPresent = packetType == VitaPacketType.IF_DATA_WITH_STREAM
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|| packetType == VitaPacketType.EXT_DATA_WITH_STREAM;
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if (streamIdPresent) {//是否有流ID,获取流ID，32位
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streamId = ((((int) data[offset]) & 0x00ff) << 24) | ((((int) data[offset + 1]) & 0x00ff) << 16)
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| ((((int) data[offset + 2]) & 0x00ff) << 8) | ((int) data[offset + 3]) & 0x00ff;
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offset += 4;
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}
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if (classIdPresent) {
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//只取24位，前8位保留
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oui = ((((int) data[offset + 1]) & 0x00ff) << 16)
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| ((((int) data[offset + 2]) & 0x00ff) << 8) | ((int) data[offset + 3]) & 0x00ff;
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informationClassCode = ((((int) data[offset + 4]) & 0x00ff) << 8) | ((int) data[offset + 5]) & 0x00ff;
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packetClassCode = ((((int) data[offset + 6]) & 0x00ff) << 8) | ((int) data[offset + 7]) & 0x00ff;
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classId = ((((int) data[offset + 4]) & 0x00ff) << 24) | ((((int) data[offset + 5]) & 0x00ff) << 16)
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| ((((int) data[offset + 6]) & 0x00ff) << 8) | ((int) data[offset + 7]) & 0x00ff;
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classId64 = ((((long) data[offset + 1]) & 0x00ff) << 48)
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| ((((long) data[offset + 2]) & 0x00ff) << 40)
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| ((((long) data[offset + 3]) & 0x00ff)<<32)
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| ((((long) data[offset + 4]) & 0x00ff) << 24)
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| ((((long) data[offset + 5]) & 0x00ff) << 16)
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| ((((long) data[offset + 6]) & 0x00ff) << 8)
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| ((long) data[offset + 7]) & 0x00ff;
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||
//Log.d(TAG,String.format("classId64:%X",classId64));
|
||
offset += 8;
|
||
}
|
||
//Log.e(TAG, "VITA: "+String.format("id: 0x%x, classIdPresent:0x%x,packetSize:%d",streamId,classId,packetSize) );
|
||
|
||
//获取时间戳,以秒为单位的时间戳，32位。
|
||
//时间戳共有两部分，小数部分和整数部分，整数部分以秒为分辨率，32位， 主要传递UTC时间或者 GPS 时间，
|
||
//小数部分主要有三种，一种是sample-count ，以采样周期为最小分辨率，一种是real-time以ps为最小单位，第三种是以任意选择的时间进行累加得出的，前面两种时间戳可以直接与整数部分叠加，第三种则不能保证与整数部分保持恒定关系，前两种与整数部分叠加来操作的可以在覆盖的时间范围为年
|
||
//小数部分的时间戳共有64位，小数部分可以在没有整数部分的情况下使用，
|
||
//所有的时间带来都是在以一个采样数据为该reference-point 时间
|
||
if (tsi != VitaTSI.TSI_NONE) {//32位,
|
||
integerTimestamp = ((((int) data[offset]) & 0x00ff) << 24) | ((((int) data[offset + 1]) & 0x00ff) << 16)
|
||
| ((((int) data[offset + 2]) & 0x00ff) << 8) | ((int) data[offset + 3]) & 0x00ff;
|
||
offset += 4;
|
||
}
|
||
//获取时间戳的小数部分，64位。
|
||
if (tsf != VitaTSF.TSF_NONE) {
|
||
fracTimeStamp = ((((long) data[offset]) & 0x00ff) << 56) | ((((long) data[offset + 1]) & 0x00ff) << 48)
|
||
| ((((long) data[offset + 2]) & 0x00ff) << 40) | ((((long) data[offset + 3]) & 0x00ff) << 32)
|
||
| ((((long) data[offset + 4]) & 0x00ff) << 24) | ((((int) data[offset + 5]) & 0x00ff) << 16)
|
||
| ((((int) data[offset + 6]) & 0x00ff) << 8) | ((int) data[offset + 7]) & 0x00ff;
|
||
offset += 8;
|
||
}
|
||
|
||
|
||
//Log.e(TAG, String.format("VITA: data length:%d,offset:%d",data.length,offset) );
|
||
if (offset < data.length) {
|
||
payload = new byte[data.length - offset - (trailerPresent ? 2 : 0)];//如果有尾部，就减去一个word的位置
|
||
System.arraycopy(data, offset, payload, 0, payload.length);
|
||
}
|
||
if (trailerPresent) {
|
||
trailer = ((((int) data[data.length - 2]) & 0x00ff) << 8) | ((int) data[data.length - 1]) & 0x00ff;
|
||
}
|
||
}
|
||
|
||
/**
|
||
* 获取payload的长度，如果没有数据，payload长度为0；
|
||
*
|
||
* @return payload长度
|
||
*/
|
||
public int getPayloadLength() {
|
||
if (buffer == null) {
|
||
return 0;
|
||
} else {
|
||
return buffer.length;
|
||
}
|
||
}
|
||
|
||
/**
|
||
* 显示扩展数据
|
||
*
|
||
* @return string
|
||
*/
|
||
public String showPayload() {
|
||
if (payload != null) {
|
||
return new String(payload);//.replace(" ", "\n");
|
||
} else {
|
||
return "";
|
||
}
|
||
}
|
||
|
||
public String showPayloadHex() {
|
||
if (payload != null) {
|
||
return byteToStr(payload);
|
||
} else {
|
||
return "";
|
||
}
|
||
}
|
||
|
||
/**
|
||
* 显示VITA 49的包头信息
|
||
*
|
||
* @return string
|
||
*/
|
||
@SuppressLint("DefaultLocale")
|
||
public String showHeadStr() {
|
||
return String.format("包类型(packetType): %s\n" +
|
||
"包数量(packetCount): %d\n" +
|
||
"包大小(packetSize): %d\n" +
|
||
"是否有流ID(streamIdPresent): %s\n" +
|
||
"流ID(streamId): 0x%X\n" +
|
||
"是否有类ID(classIdPresent): %s\n" +
|
||
"类ID(classId): 0x%X\n" +
|
||
"类高位(informationClassCode): 0x%X\n" +
|
||
"类低位(packetClassCode): 0x%X\n" +
|
||
"公司标识码(oui): 0x%X\n" +
|
||
"时间戳类型(tsi): %s\n" +
|
||
"时间戳整数部分(integerTimestamp):0x%X\n" +
|
||
"时间戳小数部分类型(tsf): %s\n" +
|
||
"时间戳小数部分值(fracTimeStamp): 0x%X\n" +
|
||
"负载长度(payloadLength): %d\n" +
|
||
"是否有尾部(trailerPresent): %s\n"
|
||
|
||
, packetType.toString()
|
||
, packetCount
|
||
, packetSize
|
||
, streamIdPresent ? "是" : "否"
|
||
, streamId
|
||
, classIdPresent ? "是" : "否"
|
||
, classId
|
||
, informationClassCode
|
||
, packetClassCode
|
||
, oui
|
||
, tsi.toString()
|
||
, integerTimestamp
|
||
, tsf.toString()
|
||
, fracTimeStamp
|
||
, (payload == null ? 0 : payload.length)
|
||
, trailerPresent ? "是" : "否"
|
||
);
|
||
}
|
||
|
||
/**
|
||
* 显示VITA 49 包数据
|
||
*
|
||
* @return string
|
||
*/
|
||
@SuppressLint("DefaultLocale")
|
||
@Override
|
||
public String toString() {
|
||
return String.format("%s负载(payload):\n%s\n"
|
||
, showHeadStr()
|
||
, (payload == null ? "" : new String(payload))
|
||
);
|
||
|
||
|
||
}
|
||
|
||
|
||
|
||
public static String byteToStr(byte[] data) {
|
||
StringBuilder s = new StringBuilder();
|
||
for (int i = 0; i < data.length; i++) {
|
||
s.append(String.format("%02x ", data[i] & 0xff));
|
||
}
|
||
return s.toString();
|
||
}
|
||
|
||
|
||
/**
|
||
* 把字节转换成short，做小端模式转换
|
||
*
|
||
* @param data 字节数据
|
||
* @param start 起始位置
|
||
* @return short
|
||
*/
|
||
public static short readShortDataBigEnd(byte[] data, int start) {
|
||
if (data.length - start < 2) return 0;
|
||
return (short) ((short) data[start] & 0xff
|
||
| ((short) data[start +1] & 0xff) << 8);
|
||
}
|
||
|
||
/**
|
||
* 把字节转换成short，不做小端转换！！
|
||
*
|
||
* @param data 字节数据
|
||
* @param start 起始位置
|
||
* @return short
|
||
*/
|
||
public static short readShortData(byte[] data, int start) {
|
||
if (data.length - start < 2) return 0;
|
||
return (short) ((short) data[start + 1] & 0xff
|
||
| ((short) data[start] & 0xff) << 8);
|
||
}
|
||
|
||
public static float readShortFloat(byte[] data, int start) {
|
||
if (data.length - start < 2) return 0.0f;
|
||
int accum = 0;
|
||
accum = accum | (data[start] & 0xff) << 0;
|
||
accum = accum | (data[start + 1] & 0xff) << 8;
|
||
return Float.intBitsToFloat(accum);
|
||
}
|
||
|
||
}
|