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/* ECU (Error Concealment Unit) for FR */
/*
* This file is part of GAPK (GSM Audio Pocket Knife).
*
* (C) 2018 by Vadim Yanitskiy <axilirator@gmail.com>
*
* All Rights Reserved
*
* GAPK 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.
*
* GAPK 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 GAPK. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <stdbool.h>
#include <osmocom/gapk/codecs.h>
#include <osmocom/codec/ecu.h>
int
ecu_proc_fr(void *_state, uint8_t *out, const uint8_t *in, unsigned int in_len)
{
struct osmo_ecu_fr_state *state = (struct osmo_ecu_fr_state *) _state;
bool backup = false;
bool bfi = true;
int i, rc;
assert(in_len == FR_CANON_LEN);
/* Check if a frame is BFI */
for (i = 1; i < in_len; i++) {
if (in[i] != 0x00) {
bfi = false;
break;
}
}
/* We have got a good frame, nothing to do */
if (!bfi) {
osmo_ecu_fr_reset(state, (uint8_t *) in);
memcpy(out, in, in_len);
return in_len;
}
/* Check if ECU state contains a backup frame */
for (i = 0; i < in_len; i++) {
if (state->frame_backup[i] != 0x00) {
backup = true;
break;
}
}
/* There is no back-up frame */
if (!backup) {
/* Copy BFI 'as-is' */
memcpy(out, in, in_len);
return in_len;
}
/* Attempt to perform error concealment */
rc = osmo_ecu_fr_conceal(state, out);
if (rc)
return rc;
return in_len;
}
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