You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
66 lines
2.3 KiB
66 lines
2.3 KiB
/* AO40 encoder / decoder
|
|
* Copyright 2002 Phil Karn, KA9Q
|
|
* May be used under the terms of the GNU General Public License (GPL)
|
|
* See CodecAO40.cpp for lineage
|
|
*
|
|
* This file is part of FUNcubeLib.
|
|
*
|
|
* FUNcubeLib 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, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* FUNcubeLib 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with FUNcubeLib If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "fecConstants.h"
|
|
|
|
class CCodecAO40
|
|
{
|
|
public:
|
|
CCodecAO40(void);
|
|
virtual ~CCodecAO40(void);
|
|
|
|
int decode(unsigned char viterbi_decoded[NBITS_OUT], unsigned char *decoded_data);
|
|
|
|
/* Encodes the 256 byte source block into 5200 byte block of symbols into m_encoded buffer */
|
|
const unsigned char *encode(
|
|
unsigned char *source_bytes, /* input to encode */
|
|
int byte_count); /* input length in bytes */
|
|
|
|
/* Compares raw input symbols to current buffer of encoded symbols and counts the errors */
|
|
int count_errors( unsigned char *raw_symbols);
|
|
|
|
private:
|
|
int mod255(int x);
|
|
int decode_rs_8(char *data, int *eras_pos, int no_eras);
|
|
void scramble_and_encode(unsigned char c);
|
|
void encode_and_interleave(unsigned char c,int cnt);
|
|
|
|
void descramble_to_rsblocks(
|
|
unsigned char viterbi_decoded[NBITS_OUT],
|
|
char rsblocks[RSBLOCKS][NN]);
|
|
|
|
void init_encoder(void);
|
|
void encode_byte(unsigned char c);
|
|
void encode_parity(void);
|
|
|
|
void interleave_symbol(int c);
|
|
|
|
int m_encoded_bytes; /* Byte counter for encode_data() */
|
|
int m_ileaver_index; /* Byte counter for interleaver */
|
|
unsigned char m_conv_sr; /* Convolutional encoder shift register state */
|
|
|
|
unsigned char m_RS_block[RSBLOCKS][NROOTS]; /* RS parity blocks */
|
|
unsigned char m_encoded[SYMPBLOCK] ; /* encoded symbols */
|
|
};
|