251 lines
8.2 KiB
C
251 lines
8.2 KiB
C
/*
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* Brickworks
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*
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* Copyright (C) 2022 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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*
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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 {{{ 0.2.0 }}}
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* requires {{{ bw_config bw_common bw_math bw_one_pole }}}
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* description {{{
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* Phase generator with portamento and exponential frequency modulation.
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*
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* It outputs a normalized phase signal (range [`0.f`, `1.f`]).
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* }}}
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* changelog {{{
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* <ul>
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* <li>Version <strong>0.2.0</strong>:
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* <ul>
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* <li>Refactored API.</li>
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* </ul>
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* </li>
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* <li>Version <strong>0.1.0</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_PHASE_GEN_H
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#define _BW_PHASE_GEN_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_phase_gen_coeffs
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* ```>>> */
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typedef struct _bw_phase_gen_coeffs bw_phase_gen_coeffs;
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/*! <<<```
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* Coefficients.
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*
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* ### bw_phase_gen_state
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* ```>>> */
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typedef struct _bw_phase_gen_state bw_phase_gen_state;
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/*! <<<```
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* State.
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*
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* #### bw_phase_gen_init()
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* ```>>> */
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static inline void bw_phase_gen_init(bw_phase_gen_coeffs *BW_RESTRICT coeffs);
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/*! <<<```
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* Initializes `coeffs`.
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*
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* #### bw_phase_gen_set_sample_rate()
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* ```>>> */
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static inline void bw_phase_gen_set_sample_rate(bw_phase_gen_coeffs *BW_RESTRICT coeffs, float sample_rate);
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/*! <<<```
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* Sets the `sample_rate` (Hz) value for the given `coeffs`.
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*
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* #### bw_phase_gen_reset()
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* ```>>> */
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static inline void bw_phase_gen_reset_state(const bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state *BW_RESTRICT state);
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/*! <<<```
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* Resets the given `state` to the initial state using the given `coeffs`.
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* >>> */
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static inline void bw_phase_gen_reset_coeffs(bw_phase_gen_coeffs *BW_RESTRICT coeffs);
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static inline void bw_phase_gen_update_coeffs_ctrl(bw_phase_gen_coeffs *BW_RESTRICT coeffs);
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static inline void bw_phase_gen_update_coeffs_audio(bw_phase_gen_coeffs *BW_RESTRICT coeffs);
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static inline void bw_phase_gen_process1(const bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state *BW_RESTRICT state, float *y, float *y_phase_inc);
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static inline void bw_phase_gen_process1_mod(const bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state *BW_RESTRICT state, float x_mod, float *y, float *y_phase_inc);
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/*! ...
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* #### bw_phase_gen_process()
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* ```>>> */
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static inline void bw_phase_gen_process(bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state *BW_RESTRICT state, const float *x_mod, float* y, float *y_phase_inc, int n_samples);
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/*! <<<```
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* Lets the given `instance` generate `n_samples` samples and puts them in
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* the output buffer `y`.
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*
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* If `x_mod` is not `NULL`, it is used as a source of exponential frequency
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* modulation (scale `1.f`/octave).
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*
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* If `y_inc` is not `NULL`, it is filled with phase increment values.
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* >>> */
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/*! ...
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* #### bw_phase_gen_set_frequency()
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* ```>>> */
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static inline void bw_phase_gen_set_frequency(bw_phase_gen_coeffs *BW_RESTRICT coeffs, float value);
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/*! <<<```
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* Sets the base frequency to `value` (Hz) for the given `instance`.
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*
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* Default value: `1.f`.
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* >>> */
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/*! ...
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* #### bw_phase_gen_set_portamento_tau()
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* ```>>> */
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static inline void bw_phase_gen_set_portamento_tau(bw_phase_gen_coeffs *BW_RESTRICT coeffs, float value);
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/*! <<<```
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* Sets the portamento time constant `value` (s) for the given `instance`.
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*
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* Default value: `0.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_math.h>
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#include <bw_one_pole.h>
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struct _bw_phase_gen_coeffs {
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// Sub-components
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bw_one_pole_coeffs portamento_coeffs;
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bw_one_pole_state portamento_state;
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// Coefficients
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float T;
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float portamento_target;
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// Parameters
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float frequency;
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float frequency_prev;
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};
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struct _bw_phase_gen_state {
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// State
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float phase;
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};
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static inline void bw_phase_gen_init(bw_phase_gen_coeffs *BW_RESTRICT coeffs) {
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bw_one_pole_init(&coeffs->portamento_coeffs);
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coeffs->frequency = 1.f;
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}
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static inline void bw_phase_gen_set_sample_rate(bw_phase_gen_coeffs *BW_RESTRICT coeffs, float sample_rate) {
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bw_one_pole_set_sample_rate(&coeffs->portamento_coeffs, sample_rate);
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coeffs->T = 1.f / sample_rate;
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}
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static inline void _bw_phase_gen_do_update_coeffs_ctrl(bw_phase_gen_coeffs *BW_RESTRICT coeffs, char force) {
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bw_one_pole_update_coeffs_ctrl(&coeffs->portamento_coeffs);
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if (force || coeffs->frequency != coeffs->frequency_prev) {
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coeffs->portamento_target = coeffs->T * coeffs->frequency;
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coeffs->frequency_prev = coeffs->frequency;
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}
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}
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static inline void bw_phase_gen_reset_coeffs(bw_phase_gen_coeffs *BW_RESTRICT coeffs) {
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_bw_phase_gen_do_update_coeffs_ctrl(coeffs, 1);
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bw_one_pole_set_init_val(&coeffs->portamento_coeffs, coeffs->portamento_target);
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bw_one_pole_reset_coeffs(&coeffs->portamento_coeffs);
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bw_one_pole_reset_state(&coeffs->portamento_coeffs, &coeffs->portamento_state);
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}
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static inline void bw_phase_gen_reset_state(const bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state *BW_RESTRICT state) {
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state->phase = 0.f;
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}
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static inline void bw_phase_gen_update_coeffs_ctrl(bw_phase_gen_coeffs *BW_RESTRICT coeffs) {
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_bw_phase_gen_do_update_coeffs_ctrl(coeffs, 0);
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}
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static inline void bw_phase_gen_update_coeffs_audio(bw_phase_gen_coeffs *BW_RESTRICT coeffs) {
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bw_one_pole_process1(&coeffs->portamento_coeffs, &coeffs->portamento_state, coeffs->portamento_target);
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}
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static inline float _bw_phase_gen_update_phase(bw_phase_gen_state *BW_RESTRICT state, float phase_inc) {
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state->phase += phase_inc;
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state->phase -= bw_floorf(state->phase);
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return state->phase;
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}
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static inline void bw_phase_gen_process1(const bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state *BW_RESTRICT state, float *y, float *y_phase_inc) {
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*y_phase_inc = bw_one_pole_get_y_z1(&coeffs->portamento_state);
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*y = _bw_phase_gen_update_phase(state, *y_phase_inc);
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}
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static inline void bw_phase_gen_process1_mod(const bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state *BW_RESTRICT state, float x_mod, float *y, float *y_phase_inc) {
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*y_phase_inc = bw_one_pole_get_y_z1(&coeffs->portamento_state) * bw_pow2f_3(x_mod);
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*y = _bw_phase_gen_update_phase(state, *y_phase_inc);
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}
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static inline void bw_phase_gen_process(bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state *BW_RESTRICT state, const float *x_mod, float* y, float *y_phase_inc, int n_samples) {
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bw_phase_gen_update_coeffs_ctrl(coeffs);
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if (x_mod != NULL) {
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if (y_phase_inc != NULL)
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for (int i = 0; i < n_samples; i++) {
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bw_phase_gen_update_coeffs_audio(coeffs);
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bw_phase_gen_process1_mod(coeffs, state, x_mod[i], y + i, y_phase_inc + i);
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}
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else
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for (int i = 0; i < n_samples; i++) {
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bw_phase_gen_update_coeffs_audio(coeffs);
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float v_phase_inc;
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bw_phase_gen_process1_mod(coeffs, state, x_mod[i], y + i, &v_phase_inc);
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}
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} else {
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if (y_phase_inc != NULL)
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for (int i = 0; i < n_samples; i++) {
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bw_phase_gen_update_coeffs_audio(coeffs);
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bw_phase_gen_process1(coeffs, state, y + i, y_phase_inc + i);
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}
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else
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for (int i = 0; i < n_samples; i++) {
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bw_phase_gen_update_coeffs_audio(coeffs);
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float v_phase_inc;
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bw_phase_gen_process1(coeffs, state, y + i, &v_phase_inc);
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}
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}
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}
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static inline void bw_phase_gen_set_frequency(bw_phase_gen_coeffs *BW_RESTRICT coeffs, float value) {
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coeffs->frequency = value;
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}
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static inline void bw_phase_gen_set_portamento_tau(bw_phase_gen_coeffs *BW_RESTRICT coeffs, float value) {
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bw_one_pole_set_tau(&coeffs->portamento_coeffs, 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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