mirror of
https://github.com/DSheirer/sdrtrunk.git
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e4323df347
detect encrypted audio state so that encrypted audio is not (incorrectly) decoded and played back to the user. Processes HDU and LDU2 messages to identify encrypted call state. Once established, all subsequent LDU1/2 messages are decoded only if the call is unencrypted. If an LDU1 message is received out-of-sequence, meaning that the initial HDU message was missed, then the LDU1 is cached until we receive an LDU2 message and correctly determine the call encryption state.
92 lines
2.7 KiB
Java
92 lines
2.7 KiB
Java
package module.decode.p25.message.ldu;
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import java.util.ArrayList;
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import java.util.List;
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import module.decode.p25.message.P25Message;
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import module.decode.p25.reference.DataUnitID;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import alias.AliasList;
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import bits.BinaryMessage;
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public abstract class LDUMessage extends P25Message
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{
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private final static Logger mLog = LoggerFactory.getLogger( LDUMessage.class );
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public static final int IMBE_FRAME_1 = 64;
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public static final int IMBE_FRAME_2 = 208;
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public static final int IMBE_FRAME_3 = 392;
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public static final int IMBE_FRAME_4 = 576;
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public static final int IMBE_FRAME_5 = 760;
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public static final int IMBE_FRAME_6 = 944;
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public static final int IMBE_FRAME_7 = 1128;
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public static final int IMBE_FRAME_8 = 1312;
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public static final int IMBE_FRAME_9 = 1488;
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public static final int[] LOW_SPEED_DATA = { 1456,1457,1458,1459,1460,1461,
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1462,1463,1472,1473,1474,1475,1476,1477,1478,1479 };
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public LDUMessage( BinaryMessage message, DataUnitID duid,
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AliasList aliasList )
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{
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super( message, duid, aliasList );
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}
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@Override
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public String getMessage()
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{
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return getMessageStub();
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}
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public String getMessageStub()
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{
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StringBuilder sb = new StringBuilder();
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sb.append( "NAC:" );
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sb.append( getNAC() );
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sb.append( " " );
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sb.append( getDUID().getLabel() );
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sb.append( " VOICE LSD:" );
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sb.append( getLowSpeedData() );
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sb.append( " " );
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return sb.toString();
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}
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public String getLowSpeedData()
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{
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return mMessage.getHex( LOW_SPEED_DATA, 4 );
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}
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public boolean isValid()
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{
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// return mCRC[ 2 ] != null && mCRC[ 2 ] != CRC.FAILED_CRC;
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return true;
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}
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/**
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* Returns a 162 byte array containing 9 IMBE voice frames of 18-bytes
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* (144-bits) each. Each frame is intact as transmitted and requires
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* deinterleaving, error correction, derandomizing, etc.
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*/
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public List<byte[]> getIMBEFrames()
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{
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List<byte[]> frames = new ArrayList<byte[]>();
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frames.add( mMessage.get( IMBE_FRAME_1, IMBE_FRAME_1 + 144 ).toByteArray() );
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frames.add( mMessage.get( IMBE_FRAME_2, IMBE_FRAME_2 + 144 ).toByteArray() );
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frames.add( mMessage.get( IMBE_FRAME_3, IMBE_FRAME_3 + 144 ).toByteArray() );
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frames.add( mMessage.get( IMBE_FRAME_4, IMBE_FRAME_4 + 144 ).toByteArray() );
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frames.add( mMessage.get( IMBE_FRAME_5, IMBE_FRAME_5 + 144 ).toByteArray() );
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frames.add( mMessage.get( IMBE_FRAME_6, IMBE_FRAME_6 + 144 ).toByteArray() );
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frames.add( mMessage.get( IMBE_FRAME_7, IMBE_FRAME_7 + 144 ).toByteArray() );
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frames.add( mMessage.get( IMBE_FRAME_8, IMBE_FRAME_8 + 144 ).toByteArray() );
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frames.add( mMessage.get( IMBE_FRAME_9, IMBE_FRAME_9 + 144 ).toByteArray() );
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return frames;
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}
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}
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