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https://gitlab.freedesktop.org/pipewire/pipewire.git
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72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
/* Spa
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*
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* Copyright © 2022 Wim Taymans
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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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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