1 /******************************************************************************
2  *
3  *  Copyright 2022 Google LLC
4  *
5  *  Licensed under the Apache License, Version 2.0 (the "License");
6  *  you may not use this file except in compliance with the License.
7  *  You may obtain a copy of the License at:
8  *
9  *  http://www.apache.org/licenses/LICENSE-2.0
10  *
11  *  Unless required by applicable law or agreed to in writing, software
12  *  distributed under the License is distributed on an "AS IS" BASIS,
13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  *  See the License for the specific language governing permissions and
15  *  limitations under the License.
16  *
17  ******************************************************************************/
18 
19 /**
20  * LC3 - Packet Loss Concealment
21  *
22  * Reference : Low Complexity Communication Codec (LC3)
23  *             Bluetooth Specification v1.0
24  */
25 
26 #ifndef __LC3_PLC_H
27 #define __LC3_PLC_H
28 
29 #include "common.h"
30 
31 
32 /**
33  * Reset PLC state
34  * plc             PLC State to reset
35  */
36 void lc3_plc_reset(lc3_plc_state_t *plc);
37 
38 /**
39  * Suspend PLC synthesis (Error-free frame decoded)
40  * plc             PLC State
41  */
42 void lc3_plc_suspend(lc3_plc_state_t *plc);
43 
44 /**
45  * Synthesis of a PLC frame
46  * dt, sr          Duration and samplerate of the frame
47  * plc             PLC State
48  * x               Last good spectral coefficients
49  * y               Return emulated ones
50  *
51  * `x` and `y` can be the same buffer
52  */
53 void lc3_plc_synthesize(enum lc3_dt dt, enum lc3_srate sr,
54     lc3_plc_state_t *plc, const float *x, float *y);
55 
56 
57 #endif /* __LC3_PLC_H */
58