541 lines
17 KiB
C++
541 lines
17 KiB
C++
/*
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* Brickworks
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*
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* Copyright (C) 2023 Orastron Srl unipersonale
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*
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* Brickworks is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* Brickworks is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Brickworks. If not, see <http://www.gnu.org/licenses/>.
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*
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* File author: Stefano D'Angelo
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*/
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/*!
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* module_type {{{ dsp }}}
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* version {{{ 1.0.0 }}}
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* requires {{{
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* bw_buf bw_common bw_delay bw_gain bw_math bw_one_pole
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* }}}
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* description {{{
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* Comb filter / delay effect with feedforward and feedback paths.
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*
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* Essentially an implementation of the structure described in
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*
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* J. Dattorro, "Effect Design, Part 2: Delay-Line Modulation and Chorus",
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* J. Audio Eng. Soc., vol. 45, no. 10, pp. 764-788, October 1997.
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*
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* Unlike in the original paper, the feedback signal is not subtracted but
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* rather added to the input.
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* }}}
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* changelog {{{
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* <ul>
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* <li>Version <strong>1.0.0</strong>:
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* <ul>
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* <li>Added initial value argument in
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* <code>bw_chorus_reset_state()</code>.</li>
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* <li>Added overloaded C++ <code>reset()</code> functions taking
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* arrays as arguments.</li>
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* <li>Now using <code>size_t</code> instead of
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* <code>BW_SIZE_T</code>.</li>
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* <li><code>bw_comb_process()</code> and
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* <code>bw_comb_process_multi()</code> now use <code>size_t</code>
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* to count samples and channels.</li>
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* <li>Added more <code>const</code> and <code>BW_RESTRICT</code>
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* specifiers to input arguments and implementation.</li>
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* <li>Moved C++ code to C header.</li>
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* <li>Added overloaded C++ <code>process()</code> function taking
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* C-style arrays as arguments.</li>
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* <li>Removed usage of reserved identifiers.</li>
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* </ul>
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* </li>
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* <li>Version <strong>0.6.0</strong>:
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* <ul>
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* <li>Removed dependency on bw_config.</li>
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* </ul>
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* </li>
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* <li>Version <strong>0.5.0</strong>:
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* <ul>
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* <li>Added <code>bw_comb_process_multi()</code>.</li>
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* <li>Updated mem_req/set API.</li>
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* <li>Added C++ wrapper.</li>
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* </ul>
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* </li>
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* </ul>
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* <li>Version <strong>0.4.0</strong>:
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* <ul>
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* <li>First release.</li>
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* </ul>
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* </li>
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* </ul>
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* }}}
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*/
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#ifndef BW_COMB_H
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#define BW_COMB_H
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#include <bw_common.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*! api {{{
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* #### bw_comb_coeffs
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* ```>>> */
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typedef struct bw_comb_coeffs bw_comb_coeffs;
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/*! <<<```
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* Coefficients and related.
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*
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* #### bw_comb_state
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* ```>>> */
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typedef struct bw_comb_state bw_comb_state;
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/*! <<<```
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* Internal state and related.
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*
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* #### bw_comb_init()
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* ```>>> */
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static inline void bw_comb_init(bw_comb_coeffs *BW_RESTRICT coeffs, float max_delay);
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/*! <<<```
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* Initializes input parameter values in `coeffs` using `max_delay` (s) as
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* the maximum delay time.
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*
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* #### bw_comb_set_sample_rate()
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* ```>>> */
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static inline void bw_comb_set_sample_rate(bw_comb_coeffs *BW_RESTRICT coeffs, float sample_rate);
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/*! <<<```
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* Sets the `sample_rate` (Hz) value in `coeffs`.
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*
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* #### bw_comb_mem_req()
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* ```>>> */
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static inline size_t bw_comb_mem_req(const bw_comb_coeffs *BW_RESTRICT coeffs);
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/*! <<<```
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* Returns the size, in bytes, of contiguous memory to be supplied to
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* `bw_comb_mem_set()` using `coeffs`.
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*
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* #### bw_comb_mem_set()
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* ```>>> */
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static inline void bw_comb_mem_set(const bw_comb_coeffs *BW_RESTRICT coeffs, bw_comb_state *BW_RESTRICT state, void *BW_RESTRICT mem);
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/*! <<<```
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* Associates the contiguous memory block `mem` to the given `state`.
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*
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* #### bw_comb_reset_coeffs()
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* ```>>> */
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static inline void bw_comb_reset_coeffs(bw_comb_coeffs *BW_RESTRICT coeffs);
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/*! <<<```
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* Resets coefficients in `coeffs` to assume their target values.
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*
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* #### bw_comb_reset_state()
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* ```>>> */
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static inline void bw_comb_reset_state(const bw_comb_coeffs *BW_RESTRICT coeffs, bw_comb_state *BW_RESTRICT state, float x_0);
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/*! <<<```
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* Resets the given `state` to its initial values using the given `coeffs`
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* and the quiescent/initial input value `x_0`.
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*
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* #### bw_comb_update_coeffs_ctrl()
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* ```>>> */
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static inline void bw_comb_update_coeffs_ctrl(bw_comb_coeffs *BW_RESTRICT coeffs);
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/*! <<<```
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* Triggers control-rate update of coefficients in `coeffs`.
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*
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* #### bw_comb_update_coeffs_audio()
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* ```>>> */
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static inline void bw_comb_update_coeffs_audio(bw_comb_coeffs *BW_RESTRICT coeffs);
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/*! <<<```
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* Triggers audio-rate update of coefficients in `coeffs`.
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*
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* #### bw_comb_process1()
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* ```>>> */
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static inline float bw_comb_process1(const bw_comb_coeffs *BW_RESTRICT coeffs, bw_comb_state *BW_RESTRICT state, float x);
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/*! <<<```
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* Processes one input sample `x` using `coeffs`, while using and updating
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* `state`. Returns the corresponding output sample.
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*
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* #### bw_comb_process()
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* ```>>> */
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static inline void bw_comb_process(bw_comb_coeffs *BW_RESTRICT coeffs, bw_comb_state *BW_RESTRICT state, const float *x, float *y, size_t n_samples);
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/*! <<<```
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* Processes the first `n_samples` of the input buffer `x` and fills the
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* first `n_samples` of the output buffer `y`, while using and updating both
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* `coeffs` and `state` (control and audio rate).
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*
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* #### bw_comb_process_multi()
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* ```>>> */
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static inline void bw_comb_process_multi(bw_comb_coeffs *BW_RESTRICT coeffs, bw_comb_state *BW_RESTRICT const *BW_RESTRICT state, const float * const *x, float * const *y, size_t n_channels, size_t n_samples);
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/*! <<<```
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* Processes the first `n_samples` of the `n_channels` input buffers `x` and
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* fills the first `n_samples` of the `n_channels` output buffers `y`, while
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* using and updating both the common `coeffs` and each of the `n_channels`
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* `state`s (control and audio rate).
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*
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* #### bw_comb_set_delay_ff()
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* ```>>> */
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static inline void bw_comb_set_delay_ff(bw_comb_coeffs *BW_RESTRICT coeffs, float value);
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/*! <<<```
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* Sets the feedforward delay time `value` (s) in `coeffs`.
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*
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* Default value: `0.f`.
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*
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* #### bw_comb_set_delay_fb()
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* ```>>> */
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static inline void bw_comb_set_delay_fb(bw_comb_coeffs *BW_RESTRICT coeffs, float value);
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/*! <<<```
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* Sets the feedback delay time `value` (s) in `coeffs`.
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*
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* Default value: `0.f`.
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*
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* #### bw_comb_set_coeff_blend()
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* ```>>> */
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static inline void bw_comb_set_coeff_blend(bw_comb_coeffs *BW_RESTRICT coeffs, float value);
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/*! <<<```
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* Sets the blend coefficient `value` in `coeffs`.
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*
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* Default value: `1.f`.
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*
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* #### bw_comb_set_coeff_ff()
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* ```>>> */
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static inline void bw_comb_set_coeff_ff(bw_comb_coeffs *BW_RESTRICT coeffs, float value);
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/*! <<<```
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* Sets the feedforward coefficient `value` in `coeffs`.
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*
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* Default value: `0.f`.
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*
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* #### bw_comb_set_coeff_fb()
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* ```>>> */
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static inline void bw_comb_set_coeff_fb(bw_comb_coeffs *BW_RESTRICT coeffs, float value);
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/*! <<<```
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* Sets the feedback coefficient `value` in `coeffs`.
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*
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* Default value: `0.f`.
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* }}} */
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#ifdef __cplusplus
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}
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#endif
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/*** Implementation ***/
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/* WARNING: This part of the file is not part of the public API. Its content may
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* change at any time in future versions. Please, do not use it directly. */
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#include <bw_delay.h>
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#include <bw_gain.h>
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#include <bw_one_pole.h>
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#include <bw_math.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct bw_comb_coeffs {
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// Sub-components
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bw_delay_coeffs delay_coeffs;
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bw_gain_coeffs blend_coeffs;
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bw_gain_coeffs ff_coeffs;
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bw_gain_coeffs fb_coeffs;
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bw_one_pole_coeffs smooth_coeffs;
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bw_one_pole_state smooth_delay_ff_state;
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bw_one_pole_state smooth_delay_fb_state;
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// Coefficients
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float fs;
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size_t dffi;
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float dfff;
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size_t dfbi;
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float dfbf;
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// Parameters
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float delay_ff;
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float delay_fb;
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};
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struct bw_comb_state {
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// Sub-components
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bw_delay_state delay_state;
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};
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static inline void bw_comb_init(bw_comb_coeffs *BW_RESTRICT coeffs, float max_delay) {
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bw_delay_init(&coeffs->delay_coeffs, max_delay);
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bw_gain_init(&coeffs->blend_coeffs);
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bw_gain_init(&coeffs->ff_coeffs);
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bw_gain_init(&coeffs->fb_coeffs);
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bw_one_pole_init(&coeffs->smooth_coeffs);
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bw_one_pole_set_tau(&coeffs->smooth_coeffs, 0.05f);
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bw_one_pole_set_sticky_thresh(&coeffs->smooth_coeffs, 1e-6f);
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bw_gain_set_gain_lin(&coeffs->ff_coeffs, 0.f);
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bw_gain_set_gain_lin(&coeffs->fb_coeffs, 0.f);
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coeffs->delay_ff = 0.f;
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coeffs->delay_fb = 0.f;
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}
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static inline void bw_comb_set_sample_rate(bw_comb_coeffs *BW_RESTRICT coeffs, float sample_rate) {
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bw_delay_set_sample_rate(&coeffs->delay_coeffs, sample_rate);
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bw_gain_set_sample_rate(&coeffs->blend_coeffs, sample_rate);
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bw_gain_set_sample_rate(&coeffs->ff_coeffs, sample_rate);
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bw_gain_set_sample_rate(&coeffs->fb_coeffs, sample_rate);
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bw_one_pole_set_sample_rate(&coeffs->smooth_coeffs, sample_rate);
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bw_one_pole_reset_coeffs(&coeffs->smooth_coeffs);
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coeffs->fs = sample_rate;
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}
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static inline size_t bw_comb_mem_req(const bw_comb_coeffs *BW_RESTRICT coeffs) {
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return bw_delay_mem_req(&coeffs->delay_coeffs);
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}
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static inline void bw_comb_mem_set(const bw_comb_coeffs *BW_RESTRICT coeffs, bw_comb_state *BW_RESTRICT state, void *BW_RESTRICT mem) {
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bw_delay_mem_set(&coeffs->delay_coeffs, &state->delay_state, mem);
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}
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static inline void bw_comb_do_update_coeffs(bw_comb_coeffs *BW_RESTRICT coeffs, char force) {
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float delay_ff_cur = bw_one_pole_get_y_z1(&coeffs->smooth_delay_ff_state);
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float delay_fb_cur = bw_one_pole_get_y_z1(&coeffs->smooth_delay_fb_state);
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if (force || delay_ff_cur != coeffs->delay_ff) {
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delay_ff_cur = bw_one_pole_process1_sticky_abs(&coeffs->smooth_coeffs, &coeffs->smooth_delay_ff_state, coeffs->delay_ff);
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const size_t len = bw_delay_get_length(&coeffs->delay_coeffs);
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const float dff = bw_maxf(coeffs->fs * delay_ff_cur, 0.f);
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float dffif;
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bw_intfracf(dff, &dffif, &coeffs->dfff);
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coeffs->dffi = (size_t)dffif;
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if (coeffs->dffi >= len) {
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coeffs->dffi = len;
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coeffs->dfff = 0.f;
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}
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}
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if (force || delay_fb_cur != coeffs->delay_fb) {
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delay_fb_cur = bw_one_pole_process1_sticky_abs(&coeffs->smooth_coeffs, &coeffs->smooth_delay_fb_state, coeffs->delay_fb);
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const size_t len = bw_delay_get_length(&coeffs->delay_coeffs);
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const float dfb = bw_maxf(coeffs->fs * delay_fb_cur, 1.f) - 1.f;
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float dfbif;
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bw_intfracf(dfb, &dfbif, &coeffs->dfbf);
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coeffs->dfbi = (size_t)dfbif;
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if (coeffs->dfbi >= len) {
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coeffs->dfbi = len;
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coeffs->dfbf = 0.f;
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}
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}
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}
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static inline void bw_comb_reset_coeffs(bw_comb_coeffs *BW_RESTRICT coeffs) {
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bw_delay_reset_coeffs(&coeffs->delay_coeffs);
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bw_gain_reset_coeffs(&coeffs->blend_coeffs);
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bw_gain_reset_coeffs(&coeffs->ff_coeffs);
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bw_gain_reset_coeffs(&coeffs->fb_coeffs);
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bw_one_pole_reset_state(&coeffs->smooth_coeffs, &coeffs->smooth_delay_ff_state, coeffs->delay_ff);
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bw_one_pole_reset_state(&coeffs->smooth_coeffs, &coeffs->smooth_delay_fb_state, coeffs->delay_fb);
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bw_comb_do_update_coeffs(coeffs, 1);
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}
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static inline void bw_comb_reset_state(const bw_comb_coeffs *BW_RESTRICT coeffs, bw_comb_state *BW_RESTRICT state, float x_0) {
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bw_delay_reset_state(&coeffs->delay_coeffs, &state->delay_state, x_0);
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}
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static inline void bw_comb_update_coeffs_ctrl(bw_comb_coeffs *BW_RESTRICT coeffs) {
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bw_gain_update_coeffs_ctrl(&coeffs->blend_coeffs);
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bw_gain_update_coeffs_ctrl(&coeffs->ff_coeffs);
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bw_gain_update_coeffs_ctrl(&coeffs->fb_coeffs);
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}
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static inline void bw_comb_update_coeffs_audio(bw_comb_coeffs *BW_RESTRICT coeffs) {
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bw_gain_update_coeffs_audio(&coeffs->blend_coeffs);
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bw_gain_update_coeffs_audio(&coeffs->ff_coeffs);
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bw_gain_update_coeffs_audio(&coeffs->fb_coeffs);
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bw_comb_do_update_coeffs(coeffs, 0);
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}
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static inline float bw_comb_process1(const bw_comb_coeffs *BW_RESTRICT coeffs, bw_comb_state *BW_RESTRICT state, float x) {
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const float fb = bw_delay_read(&coeffs->delay_coeffs, &state->delay_state, coeffs->dfbi, coeffs->dfbf);
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const float v = x + bw_gain_process1(&coeffs->fb_coeffs, fb);
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bw_delay_write(&coeffs->delay_coeffs, &state->delay_state, v);
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const float ff = bw_delay_read(&coeffs->delay_coeffs, &state->delay_state, coeffs->dffi, coeffs->dfff);
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return bw_gain_process1(&coeffs->blend_coeffs, v) + bw_gain_process1(&coeffs->ff_coeffs, ff);
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}
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static inline void bw_comb_process(bw_comb_coeffs *BW_RESTRICT coeffs, bw_comb_state *BW_RESTRICT state, const float *x, float *y, size_t n_samples) {
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bw_comb_update_coeffs_ctrl(coeffs);
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for (size_t i = 0; i < n_samples; i++) {
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bw_comb_update_coeffs_audio(coeffs);
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y[i] = bw_comb_process1(coeffs, state, x[i]);
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}
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}
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static inline void bw_comb_process_multi(bw_comb_coeffs *BW_RESTRICT coeffs, bw_comb_state *BW_RESTRICT const *BW_RESTRICT state, const float * const *x, float * const *y, size_t n_channels, size_t n_samples) {
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bw_comb_update_coeffs_ctrl(coeffs);
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for (size_t i = 0; i < n_samples; i++) {
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bw_comb_update_coeffs_audio(coeffs);
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for (size_t j = 0; j < n_channels; j++)
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y[j][i] = bw_comb_process1(coeffs, state[j], x[j][i]);
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}
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}
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static inline void bw_comb_set_delay_ff(bw_comb_coeffs *BW_RESTRICT coeffs, float value) {
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coeffs->delay_ff = value;
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}
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static inline void bw_comb_set_delay_fb(bw_comb_coeffs *BW_RESTRICT coeffs, float value) {
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coeffs->delay_fb = value;
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}
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static inline void bw_comb_set_coeff_blend(bw_comb_coeffs *BW_RESTRICT coeffs, float value) {
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bw_gain_set_gain_lin(&coeffs->blend_coeffs, value);
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}
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static inline void bw_comb_set_coeff_ff(bw_comb_coeffs *BW_RESTRICT coeffs, float value) {
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bw_gain_set_gain_lin(&coeffs->ff_coeffs, value);
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}
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static inline void bw_comb_set_coeff_fb(bw_comb_coeffs *BW_RESTRICT coeffs, float value) {
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bw_gain_set_gain_lin(&coeffs->fb_coeffs, value);
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}
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#ifdef __cplusplus
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}
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#include <array>
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namespace Brickworks {
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/*** Public C++ API ***/
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/*! api_cpp {{{
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* ##### Brickworks::Comb
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* ```>>> */
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template<size_t N_CHANNELS>
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class Comb {
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public:
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Comb(float maxDelay = 1.f);
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~Comb();
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void setSampleRate(float sampleRate);
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void reset(float x_0 = 0.f);
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void reset(const float *BW_RESTRICT x_0);
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void reset(const std::array<float, N_CHANNELS> x_0);
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void process(
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const float * const *x,
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float * const *y,
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size_t nSamples);
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void process(
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const std::array<const float *, N_CHANNELS> x,
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const std::array<float *, N_CHANNELS> y,
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size_t nSamples);
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void setDelayFF(float value);
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void setDelayFB(float value);
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void setCoeffBlend(float value);
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void setCoeffFF(float value);
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void setCoeffFB(float value);
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/*! <<<...
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* }
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* ```
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* }}} */
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/*** Implementation ***/
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/* WARNING: This part of the file is not part of the public API. Its content may
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* change at any time in future versions. Please, do not use it directly. */
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private:
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bw_comb_coeffs coeffs;
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bw_comb_state states[N_CHANNELS];
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bw_comb_state *BW_RESTRICT statesP[N_CHANNELS];
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void *BW_RESTRICT mem;
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};
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template<size_t N_CHANNELS>
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inline Comb<N_CHANNELS>::Comb(float maxDelay) {
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bw_comb_init(&coeffs, maxDelay);
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for (size_t i = 0; i < N_CHANNELS; i++)
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statesP[i] = states + i;
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mem = nullptr;
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}
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template<size_t N_CHANNELS>
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inline Comb<N_CHANNELS>::~Comb() {
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if (mem != nullptr)
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operator delete(mem);
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}
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template<size_t N_CHANNELS>
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inline void Comb<N_CHANNELS>::setSampleRate(float sampleRate) {
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bw_comb_set_sample_rate(&coeffs, sampleRate);
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size_t req = bw_comb_mem_req(&coeffs);
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if (mem != nullptr)
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operator delete(mem);
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mem = operator new(req * N_CHANNELS);
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void *m = mem;
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for (size_t i = 0; i < N_CHANNELS; i++, m = static_cast<char *>(m) + req)
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bw_comb_mem_set(&coeffs, states + i, m);
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}
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template<size_t N_CHANNELS>
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inline void Comb<N_CHANNELS>::reset(float x_0) {
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bw_comb_reset_coeffs(&coeffs);
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for (size_t i = 0; i < N_CHANNELS; i++)
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bw_comb_reset_state(&coeffs, states + i, x_0);
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}
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template<size_t N_CHANNELS>
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inline void Comb<N_CHANNELS>::reset(const float *BW_RESTRICT x_0) {
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bw_comb_reset_coeffs(&coeffs);
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for (size_t i = 0; i < N_CHANNELS; i++)
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bw_comb_reset_state(&coeffs, states + i, x_0[i]);
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}
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template<size_t N_CHANNELS>
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inline void Comb<N_CHANNELS>::reset(const std::array<float, N_CHANNELS> x_0) {
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reset(x_0.data());
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}
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template<size_t N_CHANNELS>
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inline void Comb<N_CHANNELS>::process(
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const float * const *x,
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float * const *y,
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size_t nSamples) {
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bw_comb_process_multi(&coeffs, statesP, x, y, N_CHANNELS, nSamples);
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}
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template<size_t N_CHANNELS>
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inline void Comb<N_CHANNELS>::process(
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const std::array<const float *, N_CHANNELS> x,
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const std::array<float *, N_CHANNELS> y,
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size_t nSamples) {
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process(x.data(), y.data(), nSamples);
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}
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template<size_t N_CHANNELS>
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inline void Comb<N_CHANNELS>::setDelayFF(float value) {
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bw_comb_set_delay_ff(&coeffs, value);
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}
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template<size_t N_CHANNELS>
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inline void Comb<N_CHANNELS>::setDelayFB(float value) {
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bw_comb_set_delay_fb(&coeffs, value);
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}
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template<size_t N_CHANNELS>
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inline void Comb<N_CHANNELS>::setCoeffBlend(float value) {
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bw_comb_set_coeff_blend(&coeffs, value);
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}
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template<size_t N_CHANNELS>
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inline void Comb<N_CHANNELS>::setCoeffFF(float value) {
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bw_comb_set_coeff_ff(&coeffs, value);
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}
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template<size_t N_CHANNELS>
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inline void Comb<N_CHANNELS>::setCoeffFB(float value) {
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bw_comb_set_coeff_fb(&coeffs, value);
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}
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}
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#endif
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#endif
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