348 lines
10 KiB
C++
348 lines
10 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_common bw_math bw_one_pole bw_osc_sin bw_phase_gen bw_ring_mod
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* }}}
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* description {{{
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* Tremolo with variable speed and amount.
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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><code>bw_trem_process()</code> and
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* <code>bw_trem_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 overladed 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_trem_process_multi()</code>.</li>
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* <li>Added C++ wrapper.</li>
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* </ul>
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* </li>
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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_TREM_H
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#define BW_TREM_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_trem_coeffs
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* ```>>> */
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typedef struct bw_trem_coeffs bw_trem_coeffs;
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/*! <<<```
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* Coefficients and related.
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*
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* #### bw_trem_state
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* ```>>> */
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typedef struct bw_trem_state bw_trem_state;
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/*! <<<```
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* Internal state and related.
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*
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* #### bw_trem_init()
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* ```>>> */
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static inline void bw_trem_init(bw_trem_coeffs *BW_RESTRICT coeffs);
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/*! <<<```
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* Initializes input parameter values in `coeffs`.
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*
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* #### bw_trem_set_sample_rate()
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* ```>>> */
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static inline void bw_trem_set_sample_rate(bw_trem_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_trem_reset_coeffs()
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* ```>>> */
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static inline void bw_trem_reset_coeffs(bw_trem_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_trem_reset_state()
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* ```>>> */
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static inline void bw_trem_reset_state(const bw_trem_coeffs *BW_RESTRICT coeffs, bw_trem_state *BW_RESTRICT state);
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/*! <<<```
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* Resets the given `state` to its initial values using the given `coeffs`.
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*
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* #### bw_trem_update_coeffs_ctrl()
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* ```>>> */
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static inline void bw_trem_update_coeffs_ctrl(bw_trem_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_trem_update_coeffs_audio()
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* ```>>> */
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static inline void bw_trem_update_coeffs_audio(bw_trem_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_trem_process1()
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* ```>>> */
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static inline float bw_trem_process1(const bw_trem_coeffs *BW_RESTRICT coeffs, bw_trem_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_trem_process()
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* ```>>> */
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static inline void bw_trem_process(bw_trem_coeffs *BW_RESTRICT coeffs, bw_trem_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_trem_process_multi()
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* ```>>> */
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static inline void bw_trem_process_multi(bw_trem_coeffs *BW_RESTRICT coeffs, bw_trem_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_trem_set_rate()
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* ```>>> */
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static inline void bw_trem_set_rate(bw_trem_coeffs *BW_RESTRICT coeffs, float value);
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/*! <<<```
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* Sets the modulation rate `value` (Hz) in `coeffs`.
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*
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* Default value: `1.f`.
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*
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* #### bw_trem_set_amount()
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* ```>>> */
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static inline void bw_trem_set_amount(bw_trem_coeffs *BW_RESTRICT coeffs, float value);
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/*! <<<```
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* Sets the amount parameter to the given `value` (`0.f` = no tremolo, `1.f`
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* = full tremolo, `-1.f` = full tremolo with inverted polarity) in `coeffs`.
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*
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* Default value: `1.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_phase_gen.h>
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#include <bw_osc_sin.h>
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#include <bw_ring_mod.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct bw_trem_coeffs {
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// Sub-components
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bw_phase_gen_coeffs phase_gen_coeffs;
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bw_ring_mod_coeffs ring_mod_coeffs;
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};
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struct bw_trem_state {
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bw_phase_gen_state phase_gen_state;
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};
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static inline void bw_trem_init(bw_trem_coeffs *BW_RESTRICT coeffs) {
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bw_phase_gen_init(&coeffs->phase_gen_coeffs);
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bw_ring_mod_init(&coeffs->ring_mod_coeffs);
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}
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static inline void bw_trem_set_sample_rate(bw_trem_coeffs *BW_RESTRICT coeffs, float sample_rate) {
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bw_phase_gen_set_sample_rate(&coeffs->phase_gen_coeffs, sample_rate);
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bw_ring_mod_set_sample_rate(&coeffs->ring_mod_coeffs, sample_rate);
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}
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static inline void bw_trem_reset_coeffs(bw_trem_coeffs *BW_RESTRICT coeffs) {
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bw_phase_gen_reset_coeffs(&coeffs->phase_gen_coeffs);
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bw_ring_mod_reset_coeffs(&coeffs->ring_mod_coeffs);
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}
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static inline void bw_trem_reset_state(const bw_trem_coeffs *BW_RESTRICT coeffs, bw_trem_state *BW_RESTRICT state) {
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bw_phase_gen_reset_state(&coeffs->phase_gen_coeffs, &state->phase_gen_state, 0.f);
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}
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static inline void bw_trem_update_coeffs_ctrl(bw_trem_coeffs *BW_RESTRICT coeffs) {
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bw_phase_gen_update_coeffs_ctrl(&coeffs->phase_gen_coeffs);
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bw_ring_mod_update_coeffs_ctrl(&coeffs->ring_mod_coeffs);
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}
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static inline void bw_trem_update_coeffs_audio(bw_trem_coeffs *BW_RESTRICT coeffs) {
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bw_phase_gen_update_coeffs_audio(&coeffs->phase_gen_coeffs);
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bw_ring_mod_update_coeffs_audio(&coeffs->ring_mod_coeffs);
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}
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static inline float bw_trem_process1(const bw_trem_coeffs *BW_RESTRICT coeffs, bw_trem_state *BW_RESTRICT state, float x) {
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float p, pi;
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bw_phase_gen_process1(&coeffs->phase_gen_coeffs, &state->phase_gen_state, &p, &pi);
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const float c = bw_osc_sin_process1(p);
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return bw_ring_mod_process1(&coeffs->ring_mod_coeffs, x, 1.f + c);
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}
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static inline void bw_trem_process(bw_trem_coeffs *BW_RESTRICT coeffs, bw_trem_state *BW_RESTRICT state, const float *x, float *y, size_t n_samples) {
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bw_trem_update_coeffs_ctrl(coeffs);
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for (size_t i = 0; i < n_samples; i++) {
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bw_trem_update_coeffs_audio(coeffs);
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y[i] = bw_trem_process1(coeffs, state, x[i]);
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}
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}
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static inline void bw_trem_process_multi(bw_trem_coeffs *BW_RESTRICT coeffs, bw_trem_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_trem_update_coeffs_ctrl(coeffs);
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for (size_t i = 0; i < n_samples; i++) {
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bw_trem_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_trem_process1(coeffs, state[j], x[j][i]);
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}
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}
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static inline void bw_trem_set_rate(bw_trem_coeffs *BW_RESTRICT coeffs, float value) {
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bw_phase_gen_set_frequency(&coeffs->phase_gen_coeffs, value);
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}
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static inline void bw_trem_set_amount(bw_trem_coeffs *BW_RESTRICT coeffs, float value) {
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bw_ring_mod_set_amount(&coeffs->ring_mod_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::Trem
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* ```>>> */
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template<size_t N_CHANNELS>
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class Trem {
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public:
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Trem();
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void setSampleRate(float sampleRate);
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void reset();
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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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std::array<const float *, N_CHANNELS> x,
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std::array<float *, N_CHANNELS> y,
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size_t nSamples);
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void setRate(float value);
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void setAmount(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_trem_coeffs coeffs;
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bw_trem_state states[N_CHANNELS];
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bw_trem_state *BW_RESTRICT statesP[N_CHANNELS];
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};
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template<size_t N_CHANNELS>
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inline Trem<N_CHANNELS>::Trem() {
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bw_trem_init(&coeffs);
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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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}
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template<size_t N_CHANNELS>
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inline void Trem<N_CHANNELS>::setSampleRate(float sampleRate) {
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bw_trem_set_sample_rate(&coeffs, sampleRate);
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}
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template<size_t N_CHANNELS>
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inline void Trem<N_CHANNELS>::reset() {
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bw_trem_reset_coeffs(&coeffs);
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for (size_t i = 0; i < N_CHANNELS; i++)
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bw_trem_reset_state(&coeffs, states + i);
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}
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template<size_t N_CHANNELS>
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inline void Trem<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_trem_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 Trem<N_CHANNELS>::process(
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std::array<const float *, N_CHANNELS> x,
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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 Trem<N_CHANNELS>::setRate(float value) {
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bw_trem_set_rate(&coeffs, value);
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}
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template<size_t N_CHANNELS>
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inline void Trem<N_CHANNELS>::setAmount(float value) {
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bw_trem_set_amount(&coeffs, value);
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}
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}
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#endif
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#endif
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