68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/*
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* High Speed modem to transfer data in a 2,7kHz SSB channel
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* =========================================================
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* Author: DJ0ABR
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*
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* (c) DJ0ABR
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* www.dj0abr.de
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include "qo100modem.h"
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#include "liquid.h"
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fec fecobjTX;
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fec fecobjRX;
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fec_scheme fs = LIQUID_FEC_SECDED3932; // error-correcting scheme
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uint8_t encoded_message[UdpBlocklen];
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uint8_t decoded_message[PayloadLen+framenumlen+CRClen];
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uint8_t *cfec_Reconstruct(uint8_t *darr)
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{
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memset(decoded_message,0,(PayloadLen+framenumlen+CRClen));
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fec_decode(fecobjRX, (PayloadLen+framenumlen+CRClen), darr, decoded_message);
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return decoded_message;
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}
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uint8_t *GetFEC(uint8_t *txblock, int len)
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{
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if(len != (PayloadLen+framenumlen+CRClen))
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{
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printf("wrong FEC encode length, len:%d Payloadlen:%d\n",len,PayloadLen);
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exit(0);
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}
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fec_encode(fecobjTX, len, txblock, encoded_message);
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return encoded_message;
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}
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void initFEC()
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{
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int n_enc = fec_get_enc_msg_length(fs,(PayloadLen+framenumlen+CRClen));
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if(n_enc != UdpBlocklen)
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{
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printf("wrong FEC init length\n");
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exit(0);
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}
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fecobjTX = fec_create(fs,NULL);
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fecobjRX = fec_create(fs,NULL);
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}
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