239 lines
7.6 KiB
C
239 lines
7.6 KiB
C
/*
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* Brickworks
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*
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* Copyright (C) 2022, 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 bw_svf }}}
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* description {{{
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* Wah effect.
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*
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* This is a simple digital effect, not an emulation of any analog circuit.
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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>Now using <code>size_t</code> instead of
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* <code>BW_SIZE_T</code>.</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_wah_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>Now specifying <code>0.f</code> as initial input value for
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* <code>bw_svf_reset_state()</code>.</li>
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* <li>Fixed documentation for <code>bw_wah_state</code>,
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* <code>bw_wah_reset_state()</code>, and
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* <code>bw_wah_process()</code>.</li>
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* </ul>
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* </li>
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* <li>Version <strong>0.3.0</strong>:
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* <ul>
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* <li>Use bandpass SVF output rather than lowpass.</li>
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* </ul>
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* </li>
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* <li>Version <strong>0.2.0</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_WAH_H
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#define _BW_WAH_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <bw_common.h>
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/*! api {{{
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* #### bw_wah_coeffs
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* ```>>> */
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typedef struct _bw_wah_coeffs bw_wah_coeffs;
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/*! <<<```
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* Coefficients and related.
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*
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* #### bw_wah_state
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* ```>>> */
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typedef struct _bw_wah_state bw_wah_state;
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/*! <<<```
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* Internal state and related.
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*
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* #### bw_wah_init()
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* ```>>> */
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static inline void bw_wah_init(bw_wah_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_wah_set_sample_rate()
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* ```>>> */
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static inline void bw_wah_set_sample_rate(bw_wah_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_wah_reset_coeffs()
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* ```>>> */
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static inline void bw_wah_reset_coeffs(bw_wah_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_wah_reset_state()
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* ```>>> */
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static inline void bw_wah_reset_state(const bw_wah_coeffs *BW_RESTRICT coeffs, bw_wah_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_wah_update_coeffs_ctrl()
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* ```>>> */
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static inline void bw_wah_update_coeffs_ctrl(bw_wah_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_wah_update_coeffs_audio()
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* ```>>> */
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static inline void bw_wah_update_coeffs_audio(bw_wah_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_wah_process1()
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* ```>>> */
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static inline float bw_wah_process1(const bw_wah_coeffs *BW_RESTRICT coeffs, bw_wah_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_wah_process()
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* ```>>> */
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static inline void bw_wah_process(bw_wah_coeffs *BW_RESTRICT coeffs, bw_wah_state *BW_RESTRICT state, const float *x, float *y, int 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_wah_process_multi()
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* ```>>> */
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static inline void bw_wah_process_multi(bw_wah_coeffs *BW_RESTRICT coeffs, bw_wah_state **BW_RESTRICT state, const float **x, float **y, int n_channels, int 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_wah_set_wah()
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* ```>>> */
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static inline void bw_wah_set_wah(bw_wah_coeffs *BW_RESTRICT coeffs, float value);
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/*! <<<```
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* Sets the wah pedal position to the given `value` in [`0.f` (low cutoff),
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* `1.f` (high cutoff)] in `coeffs`.
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*
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* Default value: `0.5f`.
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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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#include <bw_svf.h>
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struct _bw_wah_coeffs {
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// Sub-components
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bw_svf_coeffs svf_coeffs;
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};
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struct _bw_wah_state {
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// Sub-components
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bw_svf_state svf_state;
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};
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static inline void bw_wah_init(bw_wah_coeffs *BW_RESTRICT coeffs) {
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bw_svf_init(&coeffs->svf_coeffs);
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bw_wah_set_wah(coeffs, 0.5f);
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bw_svf_set_Q(&coeffs->svf_coeffs, 9.f);
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}
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static inline void bw_wah_set_sample_rate(bw_wah_coeffs *BW_RESTRICT coeffs, float sample_rate) {
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bw_svf_set_sample_rate(&coeffs->svf_coeffs, sample_rate);
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}
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static inline void bw_wah_reset_coeffs(bw_wah_coeffs *BW_RESTRICT coeffs) {
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bw_svf_reset_coeffs(&coeffs->svf_coeffs);
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}
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static inline void bw_wah_reset_state(const bw_wah_coeffs *BW_RESTRICT coeffs, bw_wah_state *BW_RESTRICT state) {
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bw_svf_reset_state(&coeffs->svf_coeffs, &state->svf_state, 0.f);
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}
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static inline void bw_wah_update_coeffs_ctrl(bw_wah_coeffs *BW_RESTRICT coeffs) {
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bw_svf_update_coeffs_ctrl(&coeffs->svf_coeffs);
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}
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static inline void bw_wah_update_coeffs_audio(bw_wah_coeffs *BW_RESTRICT coeffs) {
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bw_svf_update_coeffs_audio(&coeffs->svf_coeffs);
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}
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static inline float bw_wah_process1(const bw_wah_coeffs *BW_RESTRICT coeffs, bw_wah_state *BW_RESTRICT state, float x) {
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float v_lp, v_hp, v_bp;
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bw_svf_process1(&coeffs->svf_coeffs, &state->svf_state, x, &v_lp, &v_bp, &v_hp);
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return v_bp;
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}
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static inline void bw_wah_process(bw_wah_coeffs *BW_RESTRICT coeffs, bw_wah_state *BW_RESTRICT state, const float *x, float *y, int n_samples) {
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bw_wah_update_coeffs_ctrl(coeffs);
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for (int i = 0; i < n_samples; i++) {
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bw_wah_update_coeffs_audio(coeffs);
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y[i] = bw_wah_process1(coeffs, state, x[i]);
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}
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}
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static inline void bw_wah_process_multi(bw_wah_coeffs *BW_RESTRICT coeffs, bw_wah_state **BW_RESTRICT state, const float **x, float **y, int n_channels, int n_samples) {
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bw_wah_update_coeffs_ctrl(coeffs);
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for (int i = 0; i < n_samples; i++) {
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bw_wah_update_coeffs_audio(coeffs);
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for (int j = 0; j < n_channels; j++)
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y[j][i] = bw_wah_process1(coeffs, state[j], x[j][i]);
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}
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}
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static inline void bw_wah_set_wah(bw_wah_coeffs *BW_RESTRICT coeffs, float value) {
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bw_svf_set_cutoff(&coeffs->svf_coeffs, 400.f + (2e3f - 400.f) * value * value * value);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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