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dll.h
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/* Simple DLL */
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/* SPDX-FileCopyrightText: Copyright © 2019 Wim Taymans */
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/* SPDX-License-Identifier: MIT */
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#ifndef SPA_DLL_H
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#define SPA_DLL_H
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#ifdef __cplusplus
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extern
"C"
{
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#endif
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#include <stddef.h>
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#include <math.h>
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#define SPA_DLL_BW_MAX 0.128
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#define SPA_DLL_BW_MIN 0.016
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struct
spa_dll
{
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double
bw
;
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double
z1
,
z2
,
z3
;
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double
w0
,
w1
,
w2
;
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};
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static
inline
void
spa_dll_init(
struct
spa_dll
*dll)
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{
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dll->
bw
= 0.0;
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dll->
z1
= dll->
z2
= dll->
z3
= 0.0;
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}
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static
inline
void
spa_dll_set_bw(
struct
spa_dll
*dll,
double
bw,
unsigned
period,
unsigned
rate)
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{
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double
w = 2 * M_PI * bw * period / rate;
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dll->
w0
= 1.0 - exp (-20.0 * w);
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dll->
w1
= w * 1.5 / period;
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dll->
w2
= w / 1.5;
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dll->
bw
= bw;
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}
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static
inline
double
spa_dll_update(
struct
spa_dll
*dll,
double
err)
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{
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dll->
z1
+= dll->
w0
* (dll->
w1
* err - dll->
z1
);
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dll->
z2
+= dll->
w0
* (dll->
z1
- dll->
z2
);
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dll->
z3
+= dll->
w2
* dll->
z2
;
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return
1.0 - (dll->
z2
+ dll->
z3
);
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}
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#ifdef __cplusplus
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}
/* extern "C" */
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#endif
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#endif
/* SPA_DLL_H */
spa_dll
Definition
dll.h:24
spa_dll::z2
double z2
Definition
dll.h:26
spa_dll::z1
double z1
Definition
dll.h:26
spa_dll::w2
double w2
Definition
dll.h:27
spa_dll::z3
double z3
Definition
dll.h:26
spa_dll::w0
double w0
Definition
dll.h:27
spa_dll::bw
double bw
Definition
dll.h:25
spa_dll::w1
double w1
Definition
dll.h:27
spa
utils
dll.h
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