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89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2014 The libLTE Developers. See the
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* COPYRIGHT file at the top-level directory of this distribution.
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*
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* \section LICENSE
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*
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* This file is part of the libLTE library.
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*
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* libLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* libLTE 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 Lesser General Public License for more details.
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*
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* A copy of the GNU Lesser General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <math.h>
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#include "liblte/phy/fec/convcoder.h"
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#include "parity.h"
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int convcoder_encode(convcoder_t *q, char *input, char *output, uint32_t frame_length) {
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uint32_t sr;
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uint32_t i,j;
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uint32_t len = q->tail_biting ? frame_length : (frame_length + q->K - 1);
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if (q != NULL &&
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input != NULL &&
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output != NULL &&
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frame_length > q->K + 1)
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{
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if (q->tail_biting) {
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sr = 0;
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for (i=frame_length - q->K + 1; i<frame_length; i++) {
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sr = (sr << 1) | (input[i] & 1);
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}
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} else {
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sr = 0;
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}
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for (i = 0; i < len; i++) {
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char bit = (i < frame_length) ? (input[i] & 1) : 0;
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sr = (sr << 1) | bit;
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for (j=0;j<q->R;j++) {
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output[q->R * i + j] = parity(sr & q->poly[j]);
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}
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}
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return q->R*len;
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} else {
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return LIBLTE_ERROR_INVALID_INPUTS;
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}
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}
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int convcoder_initialize(convcoder_hl* h) {
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return 0;
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}
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int convcoder_work(convcoder_hl* hl) {
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hl->obj.K = hl->ctrl_in.constraint_length;
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hl->obj.R = hl->ctrl_in.rate;
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hl->obj.poly[0] = hl->ctrl_in.generator_0;
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hl->obj.poly[1] = hl->ctrl_in.generator_1;
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hl->obj.poly[2] = hl->ctrl_in.generator_2;
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hl->obj.tail_biting = hl->ctrl_in.tail_bitting?true:false;
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hl->out_len = convcoder_encode(&hl->obj, hl->input, hl->output, hl->in_len);
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return 0;
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}
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int convcoder_stop(convcoder_hl* h) {
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return 0;
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}
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