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 26 typedef 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 45 WORD32 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 50 WORD32 impd_limiter_process(ia_drc_peak_limiter_struct *peak_limiter, 51 FLOAT32 *samples, UWORD32 frame_len); 52 53 #endif 54