1/******************************************************************************
2 *
3 * Copyright (C) 2018 The Android Open Source Project
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 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
19*/
20#ifndef IMPD_DRC_PEAK_LIMITER_H
21#define IMPD_DRC_PEAK_LIMITER_H
22
23#define DEFAULT_ATTACK_TIME_MS (5.0f)   /* default attack  time in ms */
24#define DEFAULT_RELEASE_TIME_MS (50.0f) /* default release time in ms */
25
26typedef struct ia_drc_peak_limiter_struct {
27  FLOAT32 attack_time;
28  FLOAT32 release_time;
29  FLOAT32 attack_constant;
30  FLOAT32 release_constant;
31  FLOAT32 limit_threshold;
32  UWORD32 num_channels;
33  UWORD32 sample_rate;
34  UWORD32 attack_time_samples;
35  UWORD32 limiter_on;
36  FLOAT32 gain_modified;
37  FLOAT64 pre_smoothed_gain;
38  FLOAT32 *delayed_input;
39  UWORD32 delayed_input_index;
40  FLOAT32 *max_buf;
41  FLOAT32 min_gain;
42  FLOAT32 *buffer;
43} ia_drc_peak_limiter_struct;
44
45WORD32 impd_peak_limiter_init(ia_drc_peak_limiter_struct *peak_limiter,
46                              FLOAT32 attack_time, FLOAT32 release_time,
47                              FLOAT32 limit_threshold, UWORD32 num_channels,
48                              UWORD32 sample_rate, FLOAT32 *buffer);
49
50WORD32 impd_limiter_process(ia_drc_peak_limiter_struct *peak_limiter,
51                            FLOAT32 *samples, UWORD32 frame_len);
52
53#endif
54