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52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
/* Spa */
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/* SPDX-FileCopyrightText: Copyright © 2022 Wim Taymans */
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/* SPDX-License-Identifier: MIT */
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#ifndef DELAY_H
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#define DELAY_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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static inline void delay_run(float *buffer, uint32_t *pos,
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uint32_t n_buffer, uint32_t delay,
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float *dst, const float *src, const float vol, uint32_t n_samples)
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{
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uint32_t i;
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uint32_t p = *pos;
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for (i = 0; i < n_samples; i++) {
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buffer[p] = src[i];
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dst[i] = buffer[(p - delay) & (n_buffer-1)] * vol;
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p = (p + 1) & (n_buffer-1);
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}
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*pos = p;
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}
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static inline void delay_convolve_run(float *buffer, uint32_t *pos,
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uint32_t n_buffer, uint32_t delay,
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const float *taps, uint32_t n_taps,
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float *dst, const float *src, const float vol, uint32_t n_samples)
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{
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uint32_t i, j;
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uint32_t p = *pos;
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for (i = 0; i < n_samples; i++) {
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float sum = 0.0f;
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buffer[p] = src[i];
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for (j = 0; j < n_taps; j++)
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sum += (taps[j] * buffer[((p - delay) - j) & (n_buffer-1)]);
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dst[i] = sum * vol;
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p = (p + 1) & (n_buffer-1);
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}
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*pos = p;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* DELAY_H */
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