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/******************************************************************************
*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*****************************************************************************
* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
*/
#ifndef IMPD_DRC_PEAK_LIMITER_H
#define IMPD_DRC_PEAK_LIMITER_H
#define DEFAULT_ATTACK_TIME_MS (5.0f) /* default attack time in ms */
#define DEFAULT_RELEASE_TIME_MS (50.0f) /* default release time in ms */
typedef struct ia_drc_peak_limiter_struct {
FLOAT32 attack_time;
FLOAT32 release_time;
FLOAT32 attack_constant;
FLOAT32 release_constant;
FLOAT32 limit_threshold;
UWORD32 num_channels;
UWORD32 sample_rate;
UWORD32 attack_time_samples;
UWORD32 limiter_on;
FLOAT32 gain_modified;
FLOAT64 pre_smoothed_gain;
FLOAT32 *delayed_input;
UWORD32 delayed_input_index;
FLOAT32 *max_buf;
FLOAT32 min_gain;
FLOAT32 *buffer;
} ia_drc_peak_limiter_struct;
WORD32 impd_peak_limiter_init(ia_drc_peak_limiter_struct *peak_limiter,
FLOAT32 attack_time, FLOAT32 release_time,
FLOAT32 limit_threshold, UWORD32 num_channels,
UWORD32 sample_rate, FLOAT32 *buffer);
WORD32 impd_limiter_process(ia_drc_peak_limiter_struct *peak_limiter,
FLOAT32 *samples, UWORD32 frame_len);
#endif
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