| /* 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; |
| } |