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