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/*
* conv.h
*
* Copyright (C) 2011 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef __OSMO_CONV_H__
#define __OSMO_CONV_H__
#include <stdint.h>
#include <osmocom/core/bits.h>
struct osmo_conv_code {
int N;
int K;
int len;
const uint8_t (*next_output)[2];
const uint8_t (*next_state)[2];
const uint8_t *next_term_output;
const uint8_t *next_term_state;
const int *puncture;
};
/* Encoding */
/* Low level API */
struct osmo_conv_encoder {
const struct osmo_conv_code *code;
int i_idx; /* Next input bit index */
int p_idx; /* Current puncture index */
uint8_t state; /* Current state */
};
void osmo_conv_encode_init(struct osmo_conv_encoder *encoder,
const struct osmo_conv_code *code);
int osmo_conv_encode_raw(struct osmo_conv_encoder *encoder,
const ubit_t *input, ubit_t *output, int n);
int osmo_conv_encode_finish(struct osmo_conv_encoder *encoder, ubit_t *output);
/* All-in-one */
int osmo_conv_encode(const struct osmo_conv_code *code,
const ubit_t *input, ubit_t *output);
/* Decoding */
/* Low level API */
struct osmo_conv_decoder {
const struct osmo_conv_code *code;
int n_states;
int len; /* Max o_idx (excl. termination) */
int o_idx; /* output index */
int p_idx; /* puncture index */
unsigned int *ae; /* accumulater error */
unsigned int *ae_next; /* next accumulated error (tmp in scan) */
uint8_t *state_history; /* state history [len][n_states] */
};
void osmo_conv_decode_init(struct osmo_conv_decoder *decoder,
const struct osmo_conv_code *code, int len);
void osmo_conv_decode_reset(struct osmo_conv_decoder *decoder);
void osmo_conv_decode_deinit(struct osmo_conv_decoder *decoder);
int osmo_conv_decode_scan(struct osmo_conv_decoder *decoder,
const sbit_t *input, int n);
int osmo_conv_decode_finish(struct osmo_conv_decoder *decoder,
const sbit_t *input);
int osmo_conv_decode_get_output(struct osmo_conv_decoder *decoder,
ubit_t *output, int has_finish);
/* All-in-one */
int osmo_conv_decode(const struct osmo_conv_code *code,
const sbit_t *input, ubit_t *output);
#endif /* __OSMO_CONV_H__ */
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