tentative new module bw_drive
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include/bw_drive.h
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252
include/bw_drive.h
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/*
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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 {{{ 0.5.0 }}}
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* requires {{{
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* bw_config bw_common bw_gain bw_math bw_mm2 bw_peak bw_one_pole bw_satur
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* bw_svf
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* }}}
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* description {{{
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* Overdrive effect.
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*
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* Loosely inspired to the green "screaming" overdrive pedal.
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* }}}
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* changelog {{{
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* <ul>
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* <li>Version <strong>0.5.0</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_DRIVE_H
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#define _BW_DRIVE_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_drive_coeffs
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* ```>>> */
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typedef struct _bw_drive_coeffs bw_drive_coeffs;
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/*! <<<```
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* Coefficients and related.
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*
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* #### bw_drive_state
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* ```>>> */
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typedef struct _bw_drive_state bw_drive_state;
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/*! <<<```
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* Internal state and related.
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*
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* #### bw_drive_init()
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* ```>>> */
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static inline void bw_drive_init(bw_drive_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_drive_set_sample_rate()
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* ```>>> */
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static inline void bw_drive_set_sample_rate(bw_drive_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_drive_reset_coeffs()
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* ```>>> */
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static inline void bw_drive_reset_coeffs(bw_drive_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_drive_reset_state()
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* ```>>> */
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static inline void bw_drive_reset_state(const bw_drive_coeffs *BW_RESTRICT coeffs, bw_drive_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_drive_update_coeffs_ctrl()
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* ```>>> */
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static inline void bw_drive_update_coeffs_ctrl(bw_drive_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_drive_update_coeffs_audio()
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* ```>>> */
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static inline void bw_drive_update_coeffs_audio(bw_drive_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_drive_process1()
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* ```>>> */
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static inline float bw_drive_process1(const bw_drive_coeffs *BW_RESTRICT coeffs, bw_drive_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_drive_process()
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* ```>>> */
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static inline void bw_drive_process(bw_drive_coeffs *BW_RESTRICT coeffs, bw_drive_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_drive_set_drive()
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* ```>>> */
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static inline void bw_drive_set_drive(bw_drive_coeffs *BW_RESTRICT coeffs, float value);
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/*! <<<```
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* Sets the overdrive (input gain, approximately) to the given `value` in
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* [`0.f`, `1.f`] in `coeffs`.
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*
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* Default value: `0.f`.
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*
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* #### bw_drive_set_tone()
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* ```>>> */
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static inline void bw_drive_set_tone(bw_drive_coeffs *BW_RESTRICT coeffs, float value);
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/*! <<<```
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* Sets the tone (filter) to the given `value` in [`0.f`, `1.f`] in `coeffs`.
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*
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* Default value: `0.5f`.
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*
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* #### bw_drive_set_volume()
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* ```>>> */
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static inline void bw_drive_set_volume(bw_drive_coeffs *BW_RESTRICT coeffs, float value);
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/*! <<<```
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* Sets the volume (output gain) to the given `value` in [`0.f`, `1.f`] in
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* `coeffs`.
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*
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* Default value: `1.f`.
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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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#include <bw_peak.h>
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#include <bw_satur.h>
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#include <bw_gain.h>
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struct _bw_drive_coeffs {
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// Sub-components
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bw_svf_coeffs hp2_coeffs;
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bw_peak_coeffs peak_coeffs;
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bw_satur_coeffs satur_coeffs;
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bw_svf_coeffs lp2_coeffs;
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bw_gain_coeffs gain_coeffs;
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};
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struct _bw_drive_state {
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// Sub-components
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bw_svf_state svf_state;
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bw_peak_state peak_state;
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bw_satur_state satur_state;
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bw_svf_state lp2_state;
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};
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static inline void bw_drive_init(bw_drive_coeffs *BW_RESTRICT coeffs) {
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bw_svf_init(&coeffs->hp2_coeffs);
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bw_peak_init(&coeffs->peak_coeffs);
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bw_satur_init(&coeffs->satur_coeffs);
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bw_svf_init(&coeffs->lp2_coeffs);
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bw_gain_init(&coeffs->gain_coeffs);
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bw_svf_set_cutoff(&coeffs->hp2_coeffs, 16.f);
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bw_peak_set_cutoff(&coeffs->peak_coeffs, 2e3f);
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bw_peak_set_bandwidth(&coeffs->peak_coeffs, 10.f);
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bw_satur_set_gain(&coeffs->satur_coeffs, 1.5f);
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bw_lp1_set_cutoff(&coeffs->lp1_coeffs, 600.f + (7.5e3f - 600.f) * 0.125f);
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}
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static inline void bw_drive_set_sample_rate(bw_drive_coeffs *BW_RESTRICT coeffs, float sample_rate) {
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bw_svf_set_sample_rate(&coeffs->hp2_coeffs, sample_rate);
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bw_peak_set_sample_rate(&coeffs->peak_coeffs, sample_rate);
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bw_satur_set_sample_rate(&coeffs->satur_coeffs, sample_rate);
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bw_svf_set_sample_rate(&coeffs->lp2_coeffs, sample_rate);
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bw_gain_set_sample_rate(&coeffs->gain_coeffs, sample_rate);
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bw_svf_reset_coeffs(&coeffs->hp2_coeffs);
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bw_satur_reset_coeffs(&coeffs->satur_coeffs);
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}
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static inline void bw_drive_reset_coeffs(bw_drive_coeffs *BW_RESTRICT coeffs) {
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bw_peak_reset_coeffs(&coeffs->peak_coeffs);
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bw_svf_reset_coeffs(&coeffs->lp2_coeffs);
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bw_gain_reset_coeffs(&coeffs->gain_coeffs);
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}
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static inline void bw_drive_reset_state(const bw_drive_coeffs *BW_RESTRICT coeffs, bw_drive_state *BW_RESTRICT state) {
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bw_svf_reset_state(&coeffs->hp2_coeffs, &state->hp2_state, 0.f);
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bw_peak_reset_state(&coeffs->peak_coeffs, &state->peak_state, 0.f);
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bw_satur_reset_state(&coeffs->satur_coeffs, &state->satur_state);
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bw_svf_reset_state(&coeffs->lp2_coeffs, &state->lp2_state, 0.f);
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}
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static inline void bw_drive_update_coeffs_ctrl(bw_drive_coeffs *BW_RESTRICT coeffs) {
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bw_peak_update_coeffs_ctrl(&coeffs->peak_coeffs);
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bw_svf_update_coeffs_ctrl(&coeffs->lp2_coeffs);
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bw_gain_update_coeffs_ctrl(&coeffs->gain_coeffs);
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}
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static inline void bw_drive_update_coeffs_audio(bw_drive_coeffs *BW_RESTRICT coeffs) {
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bw_peak_update_coeffs_audio(&coeffs->peak_coeffs);
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bw_svf_update_coeffs_audio(&coeffs->lp2_coeffs);
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bw_gain_update_coeffs_audio(&coeffs->gain_coeffs);
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}
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static inline float bw_drive_process1(const bw_drive_coeffs *BW_RESTRICT coeffs, bw_drive_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->hp2_coeffs, &state->hp2_state, x, &v_lp, &v_bp, &v_hp);
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float y = bw_peak_process1(&coeffs->peak_coeffs, &state->peak_state, v_hp);
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y = v_hp + 0.5f * bw_satur_process1_comp(&coeffs->satur_coeffs, &state->satur_state, y);
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y = bw_svf_process1(&coeffs->lp2_coeffs, &state->lp2_state, y);
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return bw_gain_process1(&coeffs->gain_coeffs, y);
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}
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static inline void bw_drive_process(bw_drive_coeffs *BW_RESTRICT coeffs, bw_drive_state *BW_RESTRICT state, const float *x, float *y, int n_samples) {
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bw_drive_update_coeffs_ctrl(coeffs);
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for (int i = 0; i < n_samples; i++) {
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bw_drive_update_coeffs_audio(coeffs);
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y[i] = bw_drive_process1(coeffs, state, x[i]);
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}
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}
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static inline void bw_drive_set_drive(bw_drive_coeffs *BW_RESTRICT coeffs, float value) {
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bw_peak_set_peak_gain_dB(&coeffs->peak_coeffs, 40.f * value);
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}
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static inline void bw_drive_set_tone(bw_drive_coeffs *BW_RESTRICT coeffs, float value) {
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bw_lp1_set_cutoff(&coeffs->lp1_coeffs, 600.f + (7.5e3f - 600.f) * value * value * value);
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}
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static inline void bw_drive_set_volume(bw_drive_coeffs *BW_RESTRICT coeffs, float value) {
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bw_gain_set_gain_lin(&coeffs->gain_coeffs, 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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