307 lines
9.4 KiB
C++
307 lines
9.4 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 {{{ bw_common bw_math bw_one_pole }}}
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* description {{{
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* Ring modulator with variable modulation 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>Module renamed as bw_ring_mod.</li>
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* <li><code>bw_ring_mod_process()</code> and
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* <code>bw_ring_mod_process_multi()</code> now use
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* <code>size_t</code> to count samples and channels.</li>
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* <li>Added more <code>const</code> specifiers to input
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* arguments.</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_ringmod_process_multi()</code>.</li>
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* <li>Fixed inverted-polarity modulation.</li>
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* <li>"modulator signal" -> "modulation signal" in documentation.</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_RINGMOD_H
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#define BW_RINGMOD_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_ring_mod_coeffs
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* ```>>> */
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typedef struct bw_ring_mod_coeffs bw_ring_mod_coeffs;
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/*! <<<```
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* Coefficients and related.
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*
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* #### bw_ring_mod_init()
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* ```>>> */
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static inline void bw_ring_mod_init(bw_ring_mod_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_ring_mod_set_sample_rate()
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* ```>>> */
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static inline void bw_ring_mod_set_sample_rate(bw_ring_mod_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_ring_mod_reset_coeffs()
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* ```>>> */
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static inline void bw_ring_mod_reset_coeffs(bw_ring_mod_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_ring_mod_update_coeffs_ctrl()
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* ```>>> */
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static inline void bw_ring_mod_update_coeffs_ctrl(bw_ring_mod_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_ring_mod_update_coeffs_audio()
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* ```>>> */
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static inline void bw_ring_mod_update_coeffs_audio(bw_ring_mod_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_ring_mod_process1()
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* ```>>> */
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static inline float bw_ring_mod_process1(const bw_ring_mod_coeffs *BW_RESTRICT coeffs, float x_mod, float x_car);
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/*! <<<```
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* Processes one modulation input sample `x_mod` and one carrier input sample
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* `x_car` using `coeffs` and returns the corresponding output sample.
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*
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* #### bw_ring_mod_process()
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* ```>>> */
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static inline void bw_ring_mod_process(bw_ring_mod_coeffs *BW_RESTRICT coeffs, const float *x_mod, const float *x_car, float *y, size_t n_samples);
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/*! <<<```
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* Processes the first `n_samples` of the modulation input buffer `x_mod` and
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* of the carrier input buffer `x_car` and fills the first `n_samples` of the
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* output buffer `y`, while using and updating `coeffs` (control and audio
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* rate).
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*
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* #### bw_ring_mod_process_multi()
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* ```>>> */
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static inline void bw_ring_mod_process_multi(bw_ring_mod_coeffs *BW_RESTRICT coeffs, const float * const *x_mod, const float * const *x_car, 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` modulation input
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* buffers `x_mod` and of the `n_channels` carrier input buffers `x_car`, 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 the common `coeffs` (control and audio rate).
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*
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* #### bw_ring_mod_set_amount()
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* ```>>> */
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static inline void bw_ring_mod_set_amount(bw_ring_mod_coeffs *BW_RESTRICT coeffs, float value);
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/*! <<<```
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* Sets the modulation amount parameter to the given `value` (`0.f` = no
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* modulation, `1.f` = full modulation, `-1.f` = full modulation with
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* 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_math.h>
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#include <bw_one_pole.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct bw_ring_mod_coeffs {
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// Sub-components
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bw_one_pole_coeffs smooth_coeffs;
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bw_one_pole_state smooth_state;
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// Parameters
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float mod_amount;
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};
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static inline void bw_ring_mod_init(bw_ring_mod_coeffs *BW_RESTRICT 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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coeffs->mod_amount = 1.f;
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}
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static inline void bw_ring_mod_set_sample_rate(bw_ring_mod_coeffs *BW_RESTRICT coeffs, float 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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}
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static inline void bw_ring_mod_reset_coeffs(bw_ring_mod_coeffs *BW_RESTRICT coeffs) {
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bw_one_pole_reset_state(&coeffs->smooth_coeffs, &coeffs->smooth_state, coeffs->mod_amount);
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}
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static inline void bw_ring_mod_update_coeffs_ctrl(bw_ring_mod_coeffs *BW_RESTRICT coeffs) {
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(void)coeffs;
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}
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static inline void bw_ring_mod_update_coeffs_audio(bw_ring_mod_coeffs *BW_RESTRICT coeffs) {
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bw_one_pole_process1(&coeffs->smooth_coeffs, &coeffs->smooth_state, coeffs->mod_amount);
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}
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static inline float bw_ring_mod_process1(const bw_ring_mod_coeffs *BW_RESTRICT coeffs, float x_mod, float x_car) {
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const float k = bw_one_pole_get_y_z1(&coeffs->smooth_state);
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return k * x_car * x_mod + bw_absf(1.f - k) * x_mod;
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}
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static inline void bw_ring_mod_process(bw_ring_mod_coeffs *BW_RESTRICT coeffs, const float *x_mod, const float *x_car, float *y, size_t n_samples) {
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for (size_t i = 0; i < n_samples; i++) {
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bw_ring_mod_update_coeffs_audio(coeffs);
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y[i] = bw_ring_mod_process1(coeffs, x_mod[i], x_car[i]);
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}
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}
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static inline void bw_ring_mod_process_multi(bw_ring_mod_coeffs *BW_RESTRICT coeffs, const float * const *x_mod, const float * const *x_car, float * const *y, size_t n_channels, size_t n_samples) {
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for (size_t i = 0; i < n_samples; i++) {
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bw_ring_mod_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_ring_mod_process1(coeffs, x_mod[j][i], x_car[j][i]);
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}
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}
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static inline void bw_ring_mod_set_amount(bw_ring_mod_coeffs *BW_RESTRICT coeffs, float value) {
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coeffs->mod_amount = 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::RingMod
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* ```>>> */
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template<size_t N_CHANNELS>
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class RingMod {
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public:
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RingMod();
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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_mod,
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const float * const *x_car,
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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_mod,
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std::array<const float *, N_CHANNELS> x_car,
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std::array<float *, N_CHANNELS> y,
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size_t nSamples);
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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_ring_mod_coeffs coeffs;
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};
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template<size_t N_CHANNELS>
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inline RingMod<N_CHANNELS>::RingMod() {
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bw_ring_mod_init(&coeffs);
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}
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template<size_t N_CHANNELS>
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inline void RingMod<N_CHANNELS>::setSampleRate(float sampleRate) {
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bw_ring_mod_set_sample_rate(&coeffs, sampleRate);
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}
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template<size_t N_CHANNELS>
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inline void RingMod<N_CHANNELS>::reset() {
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bw_ring_mod_reset_coeffs(&coeffs);
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}
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template<size_t N_CHANNELS>
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inline void RingMod<N_CHANNELS>::process(
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const float * const *x_mod,
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const float * const *x_car,
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float * const *y,
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size_t nSamples) {
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bw_ring_mod_process_multi(&coeffs, x_mod, x_car, y, N_CHANNELS, nSamples);
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}
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template<size_t N_CHANNELS>
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inline void RingMod<N_CHANNELS>::process(
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std::array<const float *, N_CHANNELS> x_mod,
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std::array<const float *, N_CHANNELS> x_car,
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std::array<float *, N_CHANNELS> y,
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size_t nSamples) {
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process(x_mod.data(), x_car.data(), y.data(), nSamples);
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}
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template<size_t N_CHANNELS>
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inline void RingMod<N_CHANNELS>::setAmount(float value) {
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bw_ring_mod_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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