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#1618 Update Cap+ radio & group parsing, process TXI & voice frame en…
…cryption parameters, and many other changes to the DMR message processing.
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sheirerd
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Dennis Sheirer
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Aug 13, 2023
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| /* | ||
| * ***************************************************************************** | ||
| * Copyright (C) 2014-2023 Dennis Sheirer | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/> | ||
| * **************************************************************************** | ||
| */ | ||
|
|
||
| package io.github.dsheirer.edac; | ||
|
|
||
| import io.github.dsheirer.bits.BinaryMessage; | ||
| import io.github.dsheirer.bits.CorrectedBinaryMessage; | ||
|
|
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| /** | ||
| * Block Product Turbo Code 16/2 for decoding a DMR Voice Frame F payload from the 32-bit EMB field. | ||
| * <p> | ||
| * See ETSI TS 102 361-1 B.2.2.1 and B.2.2.2 | ||
| */ | ||
| public class BPTC_16_2 | ||
| { | ||
| private static final int[] DEINTERLEAVE = new int[]{0, 24, 1, 25, 2, 26, 3, 27, 4, 28, 5, 29, 6, 30, 7, 31, 8, 16, | ||
| 9, 17, 10, 18, 11, 19, 12, 20, 13, 21, 14, 22, 15, 23}; | ||
|
|
||
| /** | ||
| * Unscramble and perform FEC checks per paragraph B.2.2.1 for Non-Reverse Channel Single Burst | ||
| * | ||
| * @param message with 32 interleaved bits. | ||
| * @return descrambled and error checked message or null if the process fails or there are too many errors. | ||
| */ | ||
| public static CorrectedBinaryMessage decodeShortBurst(CorrectedBinaryMessage message) | ||
| { | ||
| CorrectedBinaryMessage deinterleaved = deinterleave(message); | ||
| int fec = Hamming16.checkAndCorrect(deinterleaved, 0); | ||
|
|
||
| if(fec == 2) //0 or 1 is good, 2 = uncorrectable errors | ||
| { | ||
| return null; | ||
| } | ||
|
|
||
| //Check for even parity. Bits 0-15 should be the same as bits 16-31. | ||
| for(int x = 0; x < 16; x++) | ||
| { | ||
| if(deinterleaved.get(x) ^ deinterleaved.get(x + 16)) | ||
| { | ||
| return null; | ||
| } | ||
| } | ||
|
|
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| return deinterleaved; | ||
| } | ||
|
|
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| /** | ||
| * Unscramble and perform FEC checks per paragraph B.2.2.2 for Reverse Channel Single Burst | ||
| * | ||
| * @param binaryMessage with 32 interleaved bits. | ||
| * @return descrambled and error checked message or null if the process fails or there are too many errors. | ||
| */ | ||
| public static CorrectedBinaryMessage decodeReverseChannel(CorrectedBinaryMessage message) | ||
| { | ||
| CorrectedBinaryMessage deinterleaved = deinterleave(message); | ||
| System.out.println(" DEINTER: " + deinterleaved.toHexString()); | ||
| int fec = Hamming16.checkAndCorrect(deinterleaved, 0); | ||
| System.out.println(" DECODED: " + deinterleaved.toHexString()); | ||
| System.out.println("FEC:" + fec); | ||
| if(fec == 2) //0 or 1 is good, 2 = uncorrectable errors | ||
| { | ||
| return null; | ||
| } | ||
|
|
||
| //Check for odd parity. Bits 0-15 should be opposite of bits 16-31. | ||
| for(int x = 0; x < 16; x++) | ||
| { | ||
| if(deinterleaved.get(x) == deinterleaved.get(x + 16)) | ||
| { | ||
| return null; | ||
| } | ||
| } | ||
|
|
||
| return deinterleaved; | ||
| } | ||
|
|
||
| /** | ||
| * Performs deinterleave of the interleaved message. | ||
| * | ||
| * @param original to deinterleave | ||
| * @return deinterleaved message | ||
| */ | ||
| public static CorrectedBinaryMessage deinterleave(CorrectedBinaryMessage original) | ||
| { | ||
| CorrectedBinaryMessage delinterleaved = new CorrectedBinaryMessage(32); | ||
| for(int x = 0; x < 32; x++) | ||
| { | ||
| if(original.get(x)) | ||
| { | ||
| delinterleaved.set(DEINTERLEAVE[x]); | ||
| } | ||
| } | ||
|
|
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| return delinterleaved; | ||
| } | ||
|
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| public static void main(String[] args) | ||
| { | ||
| String[] msgs = new String[]{"05030A03", "35003A00", "1C6D2C9E"}; | ||
|
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| for(String msg : msgs) | ||
| { | ||
| CorrectedBinaryMessage original = new CorrectedBinaryMessage(BinaryMessage.loadHex(msg)); | ||
| System.out.println("ORIGINAL: " + original.toHexString()); | ||
| CorrectedBinaryMessage decoded = decodeReverseChannel(original); | ||
| System.out.println("-------------------------"); | ||
| } | ||
| } | ||
| } |
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