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/* Spa
*
* Copyright © 2022 Wim Taymans
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef DELAY_H
#define DELAY_H
#ifdef __cplusplus
extern "C" {
#endif
static inline void delay_run(float *buffer, uint32_t *pos,
uint32_t n_buffer, uint32_t delay,
float *dst, const float *src, const float vol, uint32_t n_samples)
{
uint32_t i;
uint32_t p = *pos;
for (i = 0; i < n_samples; i++) {
buffer[p] = src[i];
dst[i] = buffer[(p - delay) & (n_buffer-1)] * vol;
p = (p + 1) & (n_buffer-1);
}
*pos = p;
}
static inline void delay_convolve_run(float *buffer, uint32_t *pos,
uint32_t n_buffer, uint32_t delay,
const float *taps, uint32_t n_taps,
float *dst, const float *src, const float vol, uint32_t n_samples)
{
uint32_t i, j;
uint32_t p = *pos;
for (i = 0; i < n_samples; i++) {
float sum = 0.0f;
buffer[p] = src[i];
for (j = 0; j < n_taps; j++)
sum += (taps[j] * buffer[((p - delay) - j) & (n_buffer-1)]);
dst[i] = sum * vol;
p = (p + 1) & (n_buffer-1);
}
*pos = p;
}
#ifdef __cplusplus
}
#endif
#endif /* DELAY_H */
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