kopia lustrzana https://github.com/N0BOY/FT8CN
270 wiersze
9.6 KiB
Java
270 wiersze
9.6 KiB
Java
package com.bg7yoz.ft8cn.ft8transmit;
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/**
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* 生成FT8音频信号的类。音频数据是32位的浮点数组。
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* @author BGY70Z
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* @date 2023-03-20
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*/
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import android.util.Log;
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import com.bg7yoz.ft8cn.Ft8Message;
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import com.bg7yoz.ft8cn.GeneralVariables;
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import com.bg7yoz.ft8cn.R;
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import com.bg7yoz.ft8cn.ft8signal.FT8Package;
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import com.bg7yoz.ft8cn.ui.ToastMessage;
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public class GenerateFT8 {
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private static final String TAG = "GenerateFT8";
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private static final int FTX_LDPC_K = 91;
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public static final int FTX_LDPC_K_BYTES = (FTX_LDPC_K + 7) / 8;
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private static final int FT8_NN = 79;
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private static final float FT8_SYMBOL_PERIOD = 0.160f;
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private static final float FT8_SYMBOL_BT = 2.0f;
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private static final float FT8_SLOT_TIME = 15.0f;
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private static final int Ft8num_samples = 15 * 12000;
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private static final float M_PI = 3.14159265358979323846f;
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public static final int num_tones = FT8_NN;//符号数量：FT8是79个，FT4是105个。
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public static final float symbol_period = FT8_SYMBOL_PERIOD;//FT8_SYMBOL_PERIOD=0.160f
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private static final float symbol_bt = FT8_SYMBOL_BT;//FT8_SYMBOL_BT=2.0f
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private static final float slot_time = FT8_SLOT_TIME;//FT8_SLOT_TIME=15f
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//public static int sample_rate = 48000;//采样率
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//public static int sample_rate = 12000;//采样率
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static {
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System.loadLibrary("ft8cn");
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}
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public static int checkI3ByCallsign(String callsign) {
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String substring = callsign.substring(callsign.length() - 2);
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if (substring.equals("/P")) {
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if (callsign.length() <= 8) {
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return 2;//i3=2消息
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} else {
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return 4;//说明时非标准呼号
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}
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}
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if (substring.equals("/R")) {
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if (callsign.length() <= 8) {
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return 1;//i3=2消息
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} else {
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return 4;//说明时非标准呼号
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}
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}
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if (callsign.contains("/")) {//除了/P /R以外，其余的都是非标准呼号
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return 4;
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}
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if (callsign.length() > 6) {//呼号大于6位，也是非标准呼号
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return 4;
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}
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if (callsign.length() == 0) {//没有呼号，就是自由文本
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return 0;
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}
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return 1;
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}
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public static String byteToBinString(byte[] data) {
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if (data == null) {
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return "";
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}
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StringBuilder string = new StringBuilder();
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for (int i = 0; i < data.length; i++) {
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string.append(String.format(",%8s", Integer.toBinaryString(data[i] & 0xff)).replace(" ", "0"));
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}
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return string.toString();
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}
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public static String byteToHexString(byte[] data) {
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StringBuilder string = new StringBuilder();
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for (int i = 0; i < data.length; i++) {
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string.append(String.format(",%02X", data[i]));
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}
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return string.toString();
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}
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/**
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* 检查是不是标准呼号
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*
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* @param callsign 呼号
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* @return 是不是
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*/
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public static boolean checkIsStandardCallsign(String callsign) {
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String temp;
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if (callsign.endsWith("/P") || callsign.endsWith("/R")){
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temp=callsign.substring(0,callsign.length()-2);
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}else {
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temp=callsign;
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}
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//FT8的认定：标准业余呼号由一个或两个字符的前缀组成，其中至少一个必须是字母，后跟一个十进制数字和最多三个字母的后缀。
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return temp.matches("[A-Z0-9]?[A-Z0-9][0-9][A-Z][A-Z0-9]?[A-Z]?");
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}
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/**
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* 检查是不是信号报告
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*
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* @param extraInfo 扩展消息
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* @return 是不是
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*/
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private static boolean checkIsReport(String extraInfo) {
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if (extraInfo.equals("73") || extraInfo.equals("RRR")
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|| extraInfo.equals("RR73")||extraInfo.equals("")) {
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return false;
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}
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return !extraInfo.trim().matches("[A-Z][A-Z][0-9][0-9]");
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}
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public static float[] generateFt8(Ft8Message msg, float frequency,int sample_rate){
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return generateFt8(msg,frequency,sample_rate,true);
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}
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public static byte[] generateA91(Ft8Message msg,boolean hasModifier){
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if (msg.callsignFrom.length()<3){
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ToastMessage.show(GeneralVariables.getStringFromResource(R.string.callsign_error));
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return null;
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}
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// 首先，将文本数据打包为二进制消息,共12个字节
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byte[] packed = new byte[FTX_LDPC_K_BYTES];
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//把"<>"去掉
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msg.callsignTo = msg.callsignTo.replace("<", "").replace(">", "");
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msg.callsignFrom = msg.callsignFrom.replace("<", "").replace(">", "");
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if (hasModifier) {
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msg.modifier = GeneralVariables.toModifier;//修饰符
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}else {
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msg.modifier="";
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}
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//判定用非标准呼号i3=4的条件：
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//1.FROMCALL为非标准呼号 ，且 符合2或3
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//2.扩展消息时 网格、RR73,RRR,73
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//3.CQ,QRZ,DE
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if (msg.i3 != 0) {//目前只支持i3=1,i3=2,i3=4,i3=0 && n3=0
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if (!checkIsStandardCallsign(msg.callsignFrom)
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&& (!checkIsReport(msg.extraInfo) || msg.checkIsCQ())) {
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msg.i3 = 4;
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//} else if (msg.callsignFrom.endsWith("/P")||(msg.callsignTo.endsWith("/P"))) {
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} else if (msg.callsignFrom.endsWith("/P")//如果目标有/P后缀，则以目标呼号为准。如果目标没有/P后缀，则以发送方是否有/P后缀为准
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||(msg.callsignTo.endsWith("/P")&&(!msg.callsignFrom.endsWith("/P")))) {
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msg.i3 = 2;
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} else {
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msg.i3 = 1;
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}
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}
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if (msg.i3 == 1 || msg.i3 == 2) {
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packed = FT8Package.generatePack77_i1(msg);
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} else if (msg.i3 == 4) {//说明是非标准呼号
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packed = FT8Package.generatePack77_i4(msg);
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} else {
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packFreeTextTo77(msg.getMessageText(), packed);
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}
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return packed;
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}
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/**
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* 生成FT8信号
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* @param msg 消息
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* @param frequency 频率
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* @param sample_rate 采样率
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* @param hasModifier 是否有修饰符
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* @return
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*/
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public static float[] generateFt8(Ft8Message msg, float frequency,int sample_rate,boolean hasModifier) {
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// if (msg.callsignFrom.length()<3){
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// ToastMessage.show(GeneralVariables.getStringFromResource(R.string.callsign_error));
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// return null;
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// }
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// // 首先，将文本数据打包为二进制消息,共12个字节
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// byte[] packed = new byte[FTX_LDPC_K_BYTES];
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// //把"<>"去掉
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// msg.callsignTo = msg.callsignTo.replace("<", "").replace(">", "");
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// msg.callsignFrom = msg.callsignFrom.replace("<", "").replace(">", "");
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// if (hasModifier) {
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// msg.modifier = GeneralVariables.toModifier;//修饰符
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// }else {
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// msg.modifier="";
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// }
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//判定用非标准呼号i3=4的条件：
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//1.FROMCALL为非标准呼号 ，且 符合2或3
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//2.扩展消息时 网格、RR73,RRR,73
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//3.CQ,QRZ,DE
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// if (msg.i3 != 0) {//目前只支持i3=1,i3=2,i3=4,i3=0 && n3=0
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// if (!checkIsStandardCallsign(msg.callsignFrom)
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// && (!checkIsReport(msg.extraInfo) || msg.checkIsCQ())) {
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// msg.i3 = 4;
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// } else if (msg.callsignFrom.endsWith("/P")||(msg.callsignTo.endsWith("/P"))) {
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// msg.i3 = 2;
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// } else {
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// msg.i3 = 1;
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// }
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// }
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//
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// if (msg.i3 == 1 || msg.i3 == 2) {
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// packed = FT8Package.generatePack77_i1(msg);
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// } else if (msg.i3 == 4) {//说明是非标准呼号
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// packed = FT8Package.generatePack77_i4(msg);
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// } else {
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// packFreeTextTo77(msg.getMessageText(), packed);
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// }
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return generateFt8ByA91(generateA91(msg,hasModifier),frequency,sample_rate);
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//return generateFt8ByA91(packed,frequency,sample_rate);
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}
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public static float[] generateFt8ByA91(byte[] a91, float frequency,int sample_rate){
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byte[] tones = new byte[num_tones]; // 79音调（符号）数组
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//此处是12个字节（91+7）/8，可以使用a91生成音频
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ft8_encode(a91, tones);
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// 第三，将FSK音调转换为音频信号b
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int num_samples = (int) (0.5f + num_tones * symbol_period * sample_rate); // 数据信号中的采样数0.5+79*0.16*12000
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float[] signal = new float[num_samples];
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//Ft8num_sampleFT8声音的总采样数，不是字节数。15*12000
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//for (int i = 0; i < Ft8num_samples; i++)//把数据全部静音。
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for (int i = 0; i < num_samples; i++)//把数据全部静音。
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{
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signal[i] = 0;
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}
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// 用79个字节符号，生成FT8音频
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synth_gfsk(tones, num_tones, frequency, symbol_bt, symbol_period, sample_rate, signal, 0);
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// for (int i = 0; i < num_samples; i++)//把数据全部静音。
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// {
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// if (signal[i]>1.0||signal[i]<-1.0){
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// Log.e(TAG, "generateFt8: "+signal[i] );
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// }
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// }
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return signal;
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}
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private static native int packFreeTextTo77(String msg, byte[] c77);
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private static native int pack77(String msg, byte[] c77);
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private static native void ft8_encode(byte[] payload, byte[] tones);
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private static native void synth_gfsk(byte[] symbols, int n_sym, float f0,
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float symbol_bt, float symbol_period,
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int signal_rate, float[] signal, int offset);
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}
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