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b943c31fd8
Including C headers inside of `extern "C"` breaks use from C++. Hoist the includes of standard C headers above the block so we don't try to mangle the stdlib. I initially tried to scope this with a targeted change but it's too hard to do correctly that way. This way, we avoid whack-a-mole. Firefox is working around this in their e21461b7b8b39cc31ba53c47d4f6f310c673ff2f commit. Bug: https://bugzilla.mozilla.org/1953080
61 lines
1.1 KiB
C
61 lines
1.1 KiB
C
/* 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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#include <stddef.h>
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#include <math.h>
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#include <spa/utils/defs.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef SPA_API_DLL
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#ifdef SPA_API_IMPL
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#define SPA_API_DLL SPA_API_IMPL
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#else
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#define SPA_API_DLL static inline
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#endif
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#endif
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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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SPA_API_DLL 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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SPA_API_DLL 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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SPA_API_DLL 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 */
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