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iir_df1_generic.h
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1/* SPDX-License-Identifier: BSD-3-Clause
2 *
3 * Copyright(c) 2022 Intel Corporation. All rights reserved.
4 *
5 * Author: Andrula Song <andrula.song@intel.com>
6 */
7
14#ifndef __IIR_DF1_GENERIC_H__
15#define __IIR_DF1_GENERIC_H__
16
17#include <stdint.h>
18
25static inline int16_t iir_df1_s16(struct iir_state_df1 *iir, int16_t x)
26{
27 return sat_int16(Q_SHIFT_RND(iir_df1(iir, ((int32_t)x) << 16), 31, 15));
28}
29
36static inline int32_t iir_df1_s24(struct iir_state_df1 *iir, int32_t x)
37{
38 return sat_int24(Q_SHIFT_RND(iir_df1(iir, x << 8), 31, 23));
39}
40
47static inline int16_t iir_df1_s32_s16(struct iir_state_df1 *iir, int32_t x)
48{
49 return sat_int16(Q_SHIFT_RND(iir_df1(iir, x), 31, 15));
50}
51
58static inline int32_t iir_df1_s32_s24(struct iir_state_df1 *iir, int32_t x)
59{
60 return sat_int24(Q_SHIFT_RND(iir_df1(iir, x), 31, 23));
61}
62
63#endif /* __IIR_DF1_GENERIC_H__ */
64
sat_int16
static int16_t sat_int16(int32_t x)
Saturate a 32-bit integer to signed 16-bit integer range.
Definition format_generic.h:56
sat_int24
static int32_t sat_int24(int32_t x)
Saturate a 32-bit integer to signed 24-bit integer range.
Definition format_generic.h:41
iir_df1
int32_t iir_df1(struct iir_state_df1 *iir, int32_t x)
Calculate IIR filter consisting of biquads.
iir_df1_s32_s16
static int16_t iir_df1_s32_s16(struct iir_state_df1 *iir, int32_t x)
Filter a 32-bit PCM input sample producing a 16-bit output sample.
Definition iir_df1_generic.h:47
iir_df1_s24
static int32_t iir_df1_s24(struct iir_state_df1 *iir, int32_t x)
Filter a 24-bit PCM sample using Direct Form 1 IIR filter.
Definition iir_df1_generic.h:36
iir_df1_s32_s24
static int32_t iir_df1_s32_s24(struct iir_state_df1 *iir, int32_t x)
Filter a 32-bit PCM input sample producing a 24-bit output sample.
Definition iir_df1_generic.h:58
iir_df1_s16
static int16_t iir_df1_s16(struct iir_state_df1 *iir, int16_t x)
Filter a 16-bit PCM sample using Direct Form 1 IIR filter.
Definition iir_df1_generic.h:25
Q_SHIFT_RND
#define Q_SHIFT_RND(x, src_q, dst_q)
Definition format.h:78
iir_state_df1
Definition iir_df1.h:24