81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
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/***************************************************************************
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*
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* Copyright 2015-2019 BES.
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* All rights reserved. All unpublished rights reserved.
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*
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* No part of this work may be used or reproduced in any form or by any
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* means, or stored in a database or retrieval system, without prior written
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* permission of BES.
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*
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* Use of this work is governed by a license granted by BES.
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* This work contains confidential and proprietary information of
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* BES. which is protected by copyright, trade secret,
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* trademark and other intellectual property rights.
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*
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****************************************************************************/
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#ifndef IIRFILT_H
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#define IIRFILT_H
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#include <stdint.h>
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enum IIR_BIQUARD_TYPE
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{
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// pass through
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IIR_BIQUARD_PASS = 0,
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// raw filter
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IIR_BIQUARD_RAW,
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// low pass filter
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IIR_BIQUARD_LPF,
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// high pass filter
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IIR_BIQUARD_HPF,
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// band pass filter, constant skirt gain, peak gain = Q
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IIR_BIQUARD_BPF0,
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// band pass filter, const 0 dB peak gain
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IIR_BIQUARD_BPF1,
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// notch filter
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IIR_BIQUARD_NOTCH,
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// allpass filter
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IIR_BIQUARD_APF,
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// peakingEQ
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IIR_BIQUARD_PEAKINGEQ,
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// low shelf filter
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IIR_BIQUARD_LOWSHELF,
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// high shelf filter
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IIR_BIQUARD_HIGHSHELF,
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IIR_BIQUARD_QTY
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};
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struct IirBiquardState
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{
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float a1, a2, b0, b1, b2;
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float s0, s1, s2;
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};
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typedef struct IirBiquardState IirBiquardState;
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void iirfilt_design(IirBiquardState *st, int fs, int f0, float gain, float q, enum IIR_BIQUARD_TYPE type);
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void iirfilt_raw(IirBiquardState *st, float b0, float b1, float b2, float a1, float a2);
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void iirfilt_reset(IirBiquardState *st, int stages);
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void iirfilt_process(IirBiquardState *st, int stages, int16_t *buf, int frame_size);
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void iirfilt_process_int24(IirBiquardState *st, int stages, int32_t *buf, int frame_size);
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void iirfilt_process_float(IirBiquardState *st, int stages, float *buf, int frame_size);
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/* Deal with master gain in iir */
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void iirfilt_process2(IirBiquardState *st, int stages, float master_gain, int16_t *buf, int frame_size);
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void iirfilt_process2_int24(IirBiquardState *st, int stages, float master_gain, int32_t *buf, int frame_size);
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void iirfilt_process2_float(IirBiquardState *st, int stages, float master_gain, float *buf, int frame_size);
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void iirfilt_process3(IirBiquardState *st, int stages, float master_gain, int16_t *buf, int frame_size, int stride);
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void iirfilt_process3_int24(IirBiquardState *st, int stages, float master_gain, int32_t *buf, int frame_size, int stride);
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void iirfilt_process3_float(IirBiquardState *st, int stages, float master_gain, float *buf, int frame_size, int stride);
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#endif
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