public String[] decode(DMRDecode TtheApp, byte[] dibit_buf) {
String cline;
theApp = TtheApp;
DecodeCACH cachdecode = new DecodeCACH();
// CACH decode
cline = cachdecode.decode(theApp, dibit_buf);
resCACH = cachdecode.isPassErrorCheck();
if (resCACH == true) {
line[1] = cline;
fonts[1] = theApp.italicFont;
colours[1] = Color.BLACK;
resEMB = EMBdecode(dibit_buf);
// If short LC data is available then display it
if (cachdecode.getShortLC() == true) {
line[7] = cachdecode.getShortLCline();
fonts[7] = theApp.boldFont;
if (cachdecode.getshortLCError() == true) {
colours[7] = Color.RED;
if (theApp.isDisplayOnlyGoodFrames() == true) line[7] = null;
} else colours[7] = Color.BLACK;
cachdecode.clearShortLC();
}
}
if ((resCACH == false) && (resEMB == false)) theApp.embeddedFrameCount = 8;
theApp.frameCount++;
return line;
}
// Error check and decode the EMB
private boolean EMBdecode(byte[] dibit_buf) {
int a, r, cc, lcss;
boolean pi;
boolean EMDdata[] = new boolean[16];
// Convert from dibits into boolean
// The EMB is broken into 2 parts either side of the embedded
// these need reuniting into a single 20 bit boolean array
r = 0;
for (a = 66; a < 70; a++) {
if (dibit_buf[a] == 0) {
EMDdata[r] = false;
EMDdata[r + 1] = false;
} else if (dibit_buf[a] == 1) {
EMDdata[r] = false;
EMDdata[r + 1] = true;
} else if (dibit_buf[a] == 2) {
EMDdata[r] = true;
EMDdata[r + 1] = false;
} else if (dibit_buf[a] == 3) {
EMDdata[r] = true;
EMDdata[r + 1] = true;
}
r = r + 2;
}
for (a = 86; a < 90; a++) {
if (dibit_buf[a] == 0) {
EMDdata[r] = false;
EMDdata[r + 1] = false;
} else if (dibit_buf[a] == 1) {
EMDdata[r] = false;
EMDdata[r + 1] = true;
} else if (dibit_buf[a] == 2) {
EMDdata[r] = true;
EMDdata[r + 1] = false;
} else if (dibit_buf[a] == 3) {
EMDdata[r] = true;
EMDdata[r + 1] = true;
}
r = r + 2;
}
// Error check the EMB
// If it passes this is a Voice Burst with Embedded Signalling
if (QuadResidue1676(EMDdata) == true) {
StringBuilder sb = new StringBuilder(250);
line[0] = theApp.getTimeStamp() + " DMR Voice Frame with Embedded Signalling";
colours[0] = Color.BLACK;
fonts[0] = theApp.boldFont;
// Colour code
if (EMDdata[0] == true) cc = 8;
else cc = 0;
if (EMDdata[1] == true) cc = cc + 4;
if (EMDdata[2] == true) cc = cc + 2;
if (EMDdata[3] == true) cc = cc + 1;
// Update the colour code display
if (theApp != null) theApp.setColourCode(cc);
// PI
pi = EMDdata[4];
// LCSS
if (EMDdata[5] == true) lcss = 2;
else lcss = 0;
if (EMDdata[6] == true) lcss++;
// Display the colour code
sb.append("EMB : Colour Code " + Integer.toString(cc));
// PI
if (pi == true) sb.append(" : PI=1");
// LCSS
if (lcss == 0) sb.append(" : Single fragment LC ");
else if (lcss == 1) sb.append(" : First fragment of LC ");
else if (lcss == 2) sb.append(" : Last fragment of LC");
else if (lcss == 3) sb.append(" : Continuation fragment of LC");
line[2] = sb.toString();
// Add this to the embedded data class
theApp.embedded_lc.addData(dibit_buf, lcss);
// Is embedded data ready
if (theApp.embedded_lc.getDataReady() == true) {
String elines[] = theApp.embedded_lc.getLines();
// Display the embedded LC along with a timestamp
line[3] = theApp.getTimeStamp() + " " + elines[0];
}
// Pass on voice data
VoiceData voicedata = new VoiceData();
voicedata.handleVoice(theApp, dibit_buf);
// If the user doesn't want to see voice frames set shouldDisplay to false
if (theApp.isDisplayVoiceFrames() == false) shouldDisplay = false;
// Return all done
return true;
} else {
// Is this a Data Frame with Embedded signalling
// See if its has a slot type field that passes its error check
SlotType slottype = new SlotType();
boolean SLOT_TYPEres, BPTCres = false;
line[0] = theApp.getTimeStamp() + " DMR Data Frame with Embedded Signalling";
colours[0] = Color.BLACK;
fonts[0] = theApp.boldFont;
line[2] = slottype.decode(theApp, dibit_buf);
SLOT_TYPEres = slottype.isPassErrorCheck();
// If the slot type is OK try to decode the rest
if (SLOT_TYPEres == true) {
int dataType = slottype.returnDataType();
// PI Header
if (dataType == 0) {
BPTC19696 bptc19696 = new BPTC19696();
if (bptc19696.decode(dibit_buf) == true) {
BPTCres = true;
boolean bits[] = bptc19696.dataOut();
// Display the PI header bits as raw binary
StringBuilder sb = new StringBuilder();
int ai;
for (ai = 0; ai < bits.length; ai++) {
if (bits[ai] == true) sb.append("1");
else sb.append("0");
}
line[3] = sb.toString();
fonts[3] = theApp.boldFont;
colours[3] = Color.BLACK;
}
}
// Voice LC Header
if (dataType == 1) {
BPTC19696 bptc19696 = new BPTC19696();
if (bptc19696.decode(dibit_buf) == true) {
BPTCres = true;
boolean bits[] = bptc19696.dataOut();
// TODO : Ensure the Voice LC Headers in Embedded Data Frames pass the Reed Solomon
// (12,9) error check
FullLinkControl flc = new FullLinkControl();
String clines[] = new String[3];
clines = flc.decode(theApp, bits);
line[3] = clines[0];
line[4] = clines[1];
line[5] = clines[2];
fonts[3] = theApp.boldFont;
colours[3] = Color.BLACK;
fonts[4] = theApp.boldFont;
colours[4] = Color.BLACK;
fonts[5] = theApp.boldFont;
colours[5] = Color.BLACK;
}
}
// Terminator with LC
if (dataType == 2) {
BPTC19696 bptc19696 = new BPTC19696();
if (bptc19696.decode(dibit_buf) == true) {
BPTCres = true;
boolean bits[] = bptc19696.dataOut();
// TODO : Ensure the Terminator LCs in Embedded Data Frames pass the Reed Solomon (12,9)
// error check
FullLinkControl flc = new FullLinkControl();
String clines[] = new String[3];
clines = flc.decode(theApp, bits);
line[3] = clines[0];
line[4] = clines[1];
line[5] = clines[2];
fonts[3] = theApp.boldFont;
colours[3] = Color.BLACK;
fonts[4] = theApp.boldFont;
colours[4] = Color.BLACK;
fonts[5] = theApp.boldFont;
colours[5] = Color.BLACK;
}
}
// CSBK
if (dataType == 3) {
BPTC19696 bptc19696 = new BPTC19696();
if (bptc19696.decode(dibit_buf) == true) {
crc tCRC = new crc();
boolean bits[] = bptc19696.dataOut();
// Does the CSBK pass its CRC test ?
if (tCRC.crcCSBK(bits) == true) {
CSBK csbk = new CSBK();
String clines[] = new String[3];
BPTCres = true;
clines = csbk.decode(theApp, bits);
line[3] = clines[0];
line[4] = clines[1];
line[5] = clines[2];
fonts[3] = theApp.boldFont;
colours[3] = Color.BLACK;
fonts[4] = theApp.boldFont;
colours[4] = Color.BLACK;
fonts[5] = theApp.boldFont;
colours[5] = Color.BLACK;
}
}
}
// Data Header
if (dataType == 6) {
BPTC19696 bptc19696 = new BPTC19696();
if (bptc19696.decode(dibit_buf) == true) {
crc tCRC = new crc();
boolean bits[] = bptc19696.dataOut();
// Does the Data Header pass its CRC test ?
if (tCRC.crcDataHeader(bits) == true) {
String clines[] = new String[3];
BPTCres = true;
DMRData data = new DMRData(theApp);
clines = data.decodeHeader(bits);
line[3] = clines[0];
line[4] = clines[1];
line[5] = clines[2];
fonts[3] = theApp.boldFont;
colours[3] = Color.BLACK;
fonts[4] = theApp.boldFont;
colours[4] = Color.BLACK;
fonts[5] = theApp.boldFont;
colours[5] = Color.BLACK;
}
}
}
// Rate ½ Data Continuation
if (dataType == 7) BPTCres = true;
// Rate ¾ Data Continuation
if (dataType == 8) BPTCres = true;
// Idle
// Error check this to detect problems with the data stream
if (dataType == 9) {
BPTC19696 bptc19696 = new BPTC19696();
BPTCres = bptc19696.decode(dibit_buf);
// If we don't want to display these then clear the lines
if (theApp.isDisplayIdlePDU() == false) shouldDisplay = false;
}
}
if ((SLOT_TYPEres == true) && (BPTCres == true)) return true;
else return false;
}
}
