mirror of https://gerrit.osmocom.org/gapk
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/* ECU (Error Concealment Unit) for FR */
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/*
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* This file is part of GAPK (GSM Audio Pocket Knife).
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*
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* (C) 2018 by Vadim Yanitskiy <axilirator@gmail.com>
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*
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* All Rights Reserved
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*
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* GAPK 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 3 of the License, or
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* (at your option) any later version.
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*
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* GAPK 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
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* along with GAPK. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include <string.h>
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#include <assert.h>
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#include <stdbool.h>
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#include <osmocom/gapk/codecs.h>
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#include <osmocom/codec/ecu.h>
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int
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ecu_proc_fr(void *_state, uint8_t *out, const uint8_t *in, unsigned int in_len)
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{
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struct osmo_ecu_fr_state *state = (struct osmo_ecu_fr_state *) _state;
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bool backup = false;
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bool bfi = true;
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int i, rc;
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assert(in_len == FR_CANON_LEN);
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/* Check if a frame is BFI */
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for (i = 1; i < in_len; i++) {
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if (in[i] != 0x00) {
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bfi = false;
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break;
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}
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}
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/* We have got a good frame, nothing to do */
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if (!bfi) {
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osmo_ecu_fr_reset(state, (uint8_t *) in);
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memcpy(out, in, in_len);
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return in_len;
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}
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/* Check if ECU state contains a backup frame */
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for (i = 0; i < in_len; i++) {
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if (state->frame_backup[i] != 0x00) {
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backup = true;
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break;
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}
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}
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/* There is no back-up frame */
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if (!backup) {
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/* Copy BFI 'as-is' */
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memcpy(out, in, in_len);
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return in_len;
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}
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/* Attempt to perform error concealment */
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rc = osmo_ecu_fr_conceal(state, out);
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if (rc)
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return rc;
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return in_len;
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}
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