kopia lustrzana https://github.com/jamescoxon/dl-fldigi
74 wiersze
1.7 KiB
C++
74 wiersze
1.7 KiB
C++
// ----------------------------------------------------------------------------
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// viterbi.h -- Viterbi decoder
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//
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// Copyright (C) 2006
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// Dave Freese, W1HKJ
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//
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// This file is part of fldigi. These filters were adapted from code contained
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// in the gmfsk source code distribution.
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//
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// Fldigi is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Fldigi is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with fldigi. If not, see <http://www.gnu.org/licenses/>.
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// ----------------------------------------------------------------------------
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#ifndef VITERBI_H
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#define VITERBI_H
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#define PATHMEM 256
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class viterbi {
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private:
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int _traceback;
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int _chunksize;
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int nstates;
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int *output;
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int outsize;
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int *metrics[PATHMEM];
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int *history[PATHMEM];
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int sequence[PATHMEM];
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int mettab[2][256];
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unsigned int ptr;
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int traceback(int *metric);
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int _k;
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int _poly1;
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int _poly2;
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public:
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viterbi(int k, int poly1, int poly2);
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~viterbi();
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void reset();
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void init();
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int settraceback(int trace);
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int setchunksize(int chunk);
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int decode(unsigned char *sym, int *metric);
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};
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class encoder {
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private:
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int *output;
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unsigned int shreg;
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unsigned int shregmask;
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int _k;
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int _poly1;
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int _poly2;
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public:
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encoder(int k, int poly1, int poly2);
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~encoder();
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int encode(int bit);
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void init(void);
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};
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#endif
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