mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-12-25 04:03:30 -05:00
DSDplus library: basic implementation with DMR and DSTAR
This commit is contained in:
f4exb
parent
e48b825741
commit
e016526226
350
dsdplus/descramble.cpp
Normal file
350
dsdplus/descramble.cpp
Normal file
@ -0,0 +1,350 @@
|
||||
///////////////////////////////////////////////////////////////////////////////////
|
||||
// Copyright (C) 2016 Edouard Griffiths, F4EXB. //
|
||||
// //
|
||||
// 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 as version 3 of the License, or //
|
||||
// //
|
||||
// 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 V3 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/>. //
|
||||
///////////////////////////////////////////////////////////////////////////////////
|
||||
|
||||
/* descramble.h */
|
||||
|
||||
// Functions for processing the radio-header:
|
||||
// descramble
|
||||
// deinterleave
|
||||
// FECdecoder
|
||||
|
||||
// (C) 2011 Jonathan Naylor G4KLX
|
||||
|
||||
/*
|
||||
* 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; version 2 of the License.
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
// This code was originally written by JOnathan Naylor, G4KLX, as part
|
||||
// of the "pcrepeatercontroller" project
|
||||
// More info:
|
||||
// http://groups.yahoo.com/group/pcrepeatercontroller
|
||||
|
||||
|
||||
|
||||
// Changes:
|
||||
// Convert C++ to C
|
||||
|
||||
// Version 20111106: initial release
|
||||
|
||||
// F4EXB: Convert back to C++ !
|
||||
|
||||
#include <string.h>
|
||||
#include "descramble.h"
|
||||
|
||||
namespace DSDplus
|
||||
{
|
||||
|
||||
const int Descramble::SCRAMBLER_TABLE_BITS[] = {
|
||||
0,0,0,0,1,1,1,0,1,1,1,1,0,0,1,0,1,1,0,0,1,0,0,1,0,0,0,0,0,0,1,0,
|
||||
0,0,1,0,0,1,1,0,0,0,1,0,1,1,1,0,1,0,1,1,0,1,1,0,0,0,0,0,1,1,0,0,
|
||||
1,1,0,1,0,1,0,0,1,1,1,0,0,1,1,1,1,0,1,1,0,1,0,0,0,0,1,0,1,0,1,0,
|
||||
1,1,1,1,1,0,1,0,0,1,0,1,0,0,0,1,1,0,1,1,1,0,0,0,1,1,1,1,1,1,1,0,
|
||||
0,0,0,1,1,1,0,1,1,1,1,0,0,1,0,1,1,0,0,1,0,0,1,0,0,0,0,0,0,1,0,0,
|
||||
0,1,0,0,1,1,0,0,0,1,0,1,1,1,0,1,0,1,1,0,1,1,0,0,0,0,0,1,1,0,0,1,
|
||||
1,0,1,0,1,0,0,1,1,1,0,0,1,1,1,1,0,1,1,0,1,0,0,0,0,1,0,1,0,1,0,1,
|
||||
1,1,1,1,0,1,0,0,1,0,1,0,0,0,1,1,0,1,1,1,0,0,0,1,1,1,1,1,1,1,0,0,
|
||||
0,0,1,1,1,0,1,1,1,1,0,0,1,0,1,1,0,0,1,0,0,1,0,0,0,0,0,0,1,0,0,0,
|
||||
1,0,0,1,1,0,0,0,1,0,1,1,1,0,1,0,1,1,0,1,1,0,0,0,0,0,1,1,0,0,1,1,
|
||||
0,1,0,1,0,0,1,1,1,0,0,1,1,1,1,0,1,1,0,1,0,0,0,0,1,0,1,0,1,0,1,1,
|
||||
1,1,1,0,1,0,0,1,0,1,0,0,0,1,1,0,1,1,1,0,0,0,1,1,1,1,1,1,1,0,0,0,
|
||||
0,1,1,1,0,1,1,1,1,0,0,1,0,1,1,0,0,1,0,0,1,0,0,0,0,0,0,1,0,0,0,1,
|
||||
0,0,1,1,0,0,0,1,0,1,1,1,0,1,0,1,1,0,1,1,0,0,0,0,0,1,1,0,0,1,1,0,
|
||||
1,0,1,0,0,1,1,1,0,0,1,1,1,1,0,1,1,0,1,0,0,0,0,1,0,1,0,1,0,1,1,1,
|
||||
1,1,0,1,0,0,1,0,1,0,0,0,1,1,0,1,1,1,0,0,0,1,1,1,1,1,1,1,0,0,0,0,
|
||||
1,1,1,0,1,1,1,1,0,0,1,0,1,1,0,0,1,0,0,1,0,0,0,0,0,0,1,0,0,0,1,0,
|
||||
0,1,1,0,0,0,1,0,1,1,1,0,1,0,1,1,0,1,1,0,0,0,0,0,1,1,0,0,1,1,0,1,
|
||||
0,1,0,0,1,1,1,0,0,1,1,1,1,0,1,1,0,1,0,0,0,0,1,0,1,0,1,0,1,1,1,1,
|
||||
1,0,1,0,0,1,0,1,0,0,0,1,1,0,1,1,1,0,0,0,1,1,1,1,1,1,1,0,0,0,0,1,
|
||||
1,1,0,1,1,1,1,0,0,1,0,1,1,0,0,1,0,0,1,0,0,0,0,0,0,1,0,0,0,1,0,0,
|
||||
1,1,0,0,0,1,0,1,1,1,0,1,0,1,1,0,1,1,0,0,0,0,0,1,1,0,0,1,1,0,1,0,
|
||||
1,0,0,1,1,1,0,0,1,1,1,1,0,1,1,0};
|
||||
|
||||
int Descramble::traceBack(int * out, int * m_pathMemory0, int * m_pathMemory1,
|
||||
int * m_pathMemory2, int * m_pathMemory3)
|
||||
{
|
||||
enum FEC_STATE
|
||||
{
|
||||
S0, S1, S2, S3
|
||||
} state;
|
||||
int loop;
|
||||
int length = 0;
|
||||
|
||||
state = S0;
|
||||
|
||||
for (loop = 329; loop >= 0; loop--, length++)
|
||||
{
|
||||
|
||||
switch (state)
|
||||
{
|
||||
case S0: // if state S0
|
||||
if (m_pathMemory0[loop])
|
||||
{
|
||||
state = S2; // lower path
|
||||
}
|
||||
else
|
||||
{
|
||||
state = S0; // upper path
|
||||
}
|
||||
; // end else - if
|
||||
out[loop] = 0;
|
||||
break;
|
||||
|
||||
case S1: // if state S1
|
||||
if (m_pathMemory1[loop])
|
||||
{
|
||||
state = S2; // lower path
|
||||
}
|
||||
else
|
||||
{
|
||||
state = S0; // upper path
|
||||
}
|
||||
; // end else - if
|
||||
out[loop] = 1;
|
||||
break;
|
||||
|
||||
case S2: // if state S2
|
||||
if (m_pathMemory2[loop])
|
||||
{
|
||||
state = S3; // lower path
|
||||
}
|
||||
else
|
||||
{
|
||||
state = S1; // upper path
|
||||
}
|
||||
; // end else - if
|
||||
out[loop] = 0;
|
||||
break;
|
||||
|
||||
case S3: // if state S3
|
||||
if (m_pathMemory3[loop])
|
||||
{
|
||||
state = S3; // lower path
|
||||
}
|
||||
else
|
||||
{
|
||||
state = S1; // upper path
|
||||
}
|
||||
; // end else - if
|
||||
out[loop] = 1;
|
||||
break;
|
||||
|
||||
}; // end switch
|
||||
}; // end for
|
||||
|
||||
return (length);
|
||||
} // end function
|
||||
|
||||
void Descramble::viterbiDecode(int n, int *data, int *m_pathMemory0, int *m_pathMemory1,
|
||||
int *m_pathMemory2, int *m_pathMemory3, int *m_pathMetric)
|
||||
{
|
||||
int tempMetric[4];
|
||||
int metric[8];
|
||||
int loop;
|
||||
|
||||
int m1;
|
||||
int m2;
|
||||
|
||||
metric[0] = (data[1] ^ 0) + (data[0] ^ 0);
|
||||
metric[1] = (data[1] ^ 1) + (data[0] ^ 1);
|
||||
metric[2] = (data[1] ^ 1) + (data[0] ^ 0);
|
||||
metric[3] = (data[1] ^ 0) + (data[0] ^ 1);
|
||||
metric[4] = (data[1] ^ 1) + (data[0] ^ 1);
|
||||
metric[5] = (data[1] ^ 0) + (data[0] ^ 0);
|
||||
metric[6] = (data[1] ^ 0) + (data[0] ^ 1);
|
||||
metric[7] = (data[1] ^ 1) + (data[0] ^ 0);
|
||||
|
||||
// Pres. state = S0, Prev. state = S0 & S2
|
||||
m1 = metric[0] + m_pathMetric[0];
|
||||
m2 = metric[4] + m_pathMetric[2];
|
||||
if (m1 < m2)
|
||||
{
|
||||
m_pathMemory0[n] = 0;
|
||||
tempMetric[0] = m1;
|
||||
}
|
||||
else
|
||||
{
|
||||
m_pathMemory0[n] = 1;
|
||||
tempMetric[0] = m2;
|
||||
}; // end else - if
|
||||
|
||||
// Pres. state = S1, Prev. state = S0 & S2
|
||||
m1 = metric[1] + m_pathMetric[0];
|
||||
m2 = metric[5] + m_pathMetric[2];
|
||||
if (m1 < m2)
|
||||
{
|
||||
m_pathMemory1[n] = 0;
|
||||
tempMetric[1] = m1;
|
||||
}
|
||||
else
|
||||
{
|
||||
m_pathMemory1[n] = 1;
|
||||
tempMetric[1] = m2;
|
||||
}; // end else - if
|
||||
|
||||
// Pres. state = S2, Prev. state = S2 & S3
|
||||
m1 = metric[2] + m_pathMetric[1];
|
||||
m2 = metric[6] + m_pathMetric[3];
|
||||
if (m1 < m2)
|
||||
{
|
||||
m_pathMemory2[n] = 0;
|
||||
tempMetric[2] = m1;
|
||||
}
|
||||
else
|
||||
{
|
||||
m_pathMemory2[n] = 1;
|
||||
tempMetric[2] = m2;
|
||||
}
|
||||
|
||||
// Pres. state = S3, Prev. state = S1 & S3
|
||||
m1 = metric[3] + m_pathMetric[1];
|
||||
m2 = metric[7] + m_pathMetric[3];
|
||||
if (m1 < m2)
|
||||
{
|
||||
m_pathMemory3[n] = 0;
|
||||
tempMetric[3] = m1;
|
||||
}
|
||||
else
|
||||
{
|
||||
m_pathMemory3[n] = 1;
|
||||
tempMetric[3] = m2;
|
||||
}; // end else - if
|
||||
|
||||
for (loop = 0; loop < 4; loop++)
|
||||
{
|
||||
m_pathMetric[loop] = tempMetric[loop];
|
||||
}; // end for
|
||||
|
||||
} // end function ViterbiDecode
|
||||
|
||||
int Descramble::FECdecoder(int * in, int * out)
|
||||
{
|
||||
int outLen;
|
||||
|
||||
int m_pathMemory0[330];
|
||||
memset(m_pathMemory0, 0, 330 * sizeof(int));
|
||||
int m_pathMemory1[330];
|
||||
memset(m_pathMemory1, 0, 330 * sizeof(int));
|
||||
int m_pathMemory2[330];
|
||||
memset(m_pathMemory2, 0, 330 * sizeof(int));
|
||||
int m_pathMemory3[330];
|
||||
memset(m_pathMemory3, 0, 330 * sizeof(int));
|
||||
int m_pathMetric[4];
|
||||
|
||||
int loop, loop2;
|
||||
|
||||
int n = 0;
|
||||
|
||||
for (loop = 0; loop < 4; loop++)
|
||||
{
|
||||
m_pathMetric[loop] = 0;
|
||||
}; // end for
|
||||
|
||||
for (loop2 = 0; loop2 < 660; loop2 += 2, n++)
|
||||
{
|
||||
int data[2];
|
||||
|
||||
if (in[loop2])
|
||||
{
|
||||
data[1] = 1;
|
||||
}
|
||||
else
|
||||
{
|
||||
data[1] = 0;
|
||||
}; // end else - if
|
||||
|
||||
if (in[loop2 + 1])
|
||||
{
|
||||
data[0] = 1;
|
||||
}
|
||||
else
|
||||
{
|
||||
data[0] = 0;
|
||||
}; // end else - if
|
||||
|
||||
viterbiDecode(n, data, m_pathMemory0, m_pathMemory1, m_pathMemory2,
|
||||
m_pathMemory3, m_pathMetric);
|
||||
}; // end for
|
||||
|
||||
outLen = traceBack(out, m_pathMemory0, m_pathMemory1, m_pathMemory2,
|
||||
m_pathMemory3);
|
||||
|
||||
// Swap endian-ness
|
||||
// code removed (done converting bits into octets), done in main program
|
||||
|
||||
//for (loop=0;loop<330;loop+=8) {
|
||||
// int temp;
|
||||
// temp=out[loop];out[loop]=out[loop+7];out[loop+7]=temp;
|
||||
// temp=out[loop+1];out[loop+1]=out[loop+6];out[loop+6]=temp;
|
||||
// temp=out[loop+2];out[loop+2]=out[loop+5];out[loop+5]=temp;
|
||||
// temp=out[loop+3];out[loop+3]=out[loop+4];out[loop+4]=temp;
|
||||
//}
|
||||
|
||||
return (outLen);
|
||||
} // end function FECdecoder
|
||||
|
||||
void Descramble::deinterleave(int * in, int * out)
|
||||
{
|
||||
|
||||
int k = 0;
|
||||
int loop = 0;
|
||||
// function starts here
|
||||
|
||||
// init vars
|
||||
k = 0;
|
||||
|
||||
for (loop = 0; loop < 660; loop++)
|
||||
{
|
||||
out[k] = in[loop];
|
||||
|
||||
k += 24;
|
||||
|
||||
if (k >= 672)
|
||||
{
|
||||
k -= 671;
|
||||
}
|
||||
else if (k >= 660)
|
||||
{
|
||||
k -= 647;
|
||||
}; // end elsif - if
|
||||
}; // end for
|
||||
} // end function deinterleave
|
||||
|
||||
void Descramble::scramble (int * in,int * out)
|
||||
{
|
||||
int loop = 0;
|
||||
int m_count = 0;
|
||||
|
||||
for (loop = 0; loop < 660; loop++)
|
||||
{
|
||||
out[loop] = in[loop] ^ SCRAMBLER_TABLE_BITS[m_count++];
|
||||
|
||||
if (m_count >= SCRAMBLER_TABLE_BITS_LENGTH)
|
||||
{
|
||||
m_count = 0U;
|
||||
}; // end if
|
||||
}; // end for
|
||||
}
|
||||
|
||||
} // namespace DSDplus
|
||||
|
||||
|
||||
44
dsdplus/descramble.h
Normal file
44
dsdplus/descramble.h
Normal file
@ -0,0 +1,44 @@
|
||||
///////////////////////////////////////////////////////////////////////////////////
|
||||
// Copyright (C) 2016 Edouard Griffiths, F4EXB. //
|
||||
// //
|
||||
// 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 as version 3 of the License, or //
|
||||
// //
|
||||
// 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 V3 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/>. //
|
||||
///////////////////////////////////////////////////////////////////////////////////
|
||||
|
||||
#ifndef DSDPLUS_DESCRAMBLE_H_
|
||||
#define DSDPLUS_DESCRAMBLE_H_
|
||||
|
||||
namespace DSDplus
|
||||
{
|
||||
|
||||
class Descramble
|
||||
{
|
||||
public:
|
||||
// Descramble();
|
||||
// ~Descramble();
|
||||
|
||||
static void scramble (int * in,int * out);
|
||||
static void deinterleave (int * in, int * out);
|
||||
static int FECdecoder (int * in, int * out);
|
||||
|
||||
private:
|
||||
static int traceBack (int * out, int * m_pathMemory0, int * m_pathMemory1, int * m_pathMemory2, int * m_pathMemory3);
|
||||
static void viterbiDecode (int n, int *data, int *m_pathMemory0, int *m_pathMemory1, int *m_pathMemory2, int *m_pathMemory3, int *m_pathMetric);
|
||||
|
||||
static const int SCRAMBLER_TABLE_BITS_LENGTH=720;
|
||||
static const int SCRAMBLER_TABLE_BITS[];
|
||||
};
|
||||
|
||||
|
||||
} // namespace DSDplus
|
||||
|
||||
#endif /* DSDPLUS_DESCRAMBLE_H_ */
|
||||
@ -308,7 +308,6 @@ void DSDDstar::processData()
|
||||
//printf("never scrambled-%s\n",slowdata);
|
||||
}
|
||||
|
||||
|
||||
if (terminate)
|
||||
{
|
||||
m_dsdDecoder->m_fsmState = DSDDecoder::DSDLookForSync; // end
|
||||
|
||||
Loading…
Reference in New Issue
Block a user