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