557 lines
18 KiB
C++
557 lines
18 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 }}}
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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>1.0.0</strong>:
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* <ul>
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* <li><code>bw_phase_gen_process()</code> and
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* <code>bw_phase_gen_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_phase_gen_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>Fixed unused parameter warnings.</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>Added <code>BW_RESTRICT</code> to
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* <code>bw_phase_gen_process1*()</code>.</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>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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#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_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 and related.
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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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* Internal state and related.
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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 input parameter values in `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 in `coeffs`.
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*
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* #### bw_phase_gen_reset_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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/*! <<<```
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* Resets coefficients in `coeffs` to assume their target values.
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*
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* #### bw_phase_gen_reset_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, float phase_0);
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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_phase_gen_update_coeffs_ctrl()
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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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/*! <<<```
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* Triggers control-rate update of coefficients in `coeffs`.
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*
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* #### bw_phase_gen_update_coeffs_audio()
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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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/*! <<<```
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* Triggers audio-rate update of coefficients in `coeffs`.
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*
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* #### bw_phase_gen_process1\*()
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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 *BW_RESTRICT y, float *BW_RESTRICT 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 *BW_RESTRICT y, float *BW_RESTRICT y_phase_inc);
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/*! <<<```
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* These functions generate and return one sample using `coeffs`, while using
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* and updating `state`, and put the corresponding phase increment value in
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* `y_phase_inc`.
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*
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* In particular:
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* * `bw_phase_gen_process1()` does not apply exponential frequency
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* modulation;
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* * `bw_phase_gen_process1_mod()` applies exponential frequency modulation
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* using `x_mod` as modulation input (scale `1.f`/octave).
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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, size_t n_samples);
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/*! <<<```
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* Generates and fills the first `n_samples` of the output buffer `y`, while
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* using and updating both `coeffs` and `state` (control and audio rate).
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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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* #### bw_phase_gen_process_multi()
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* ```>>> */
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static inline void bw_phase_gen_process_multi(bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state * const *BW_RESTRICT state, const float * const *x_mod, float **y, float **y_phase_inc, size_t n_channels, size_t n_samples);
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/*! <<<```
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* Generates and fills the first `n_samples` of the `n_channels` output
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* buffers `y`, while using and updating both the common `coeffs` and each of
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* the `n_channels` `state`s (control and audio rate).
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*
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* If `x_mod` and the channel-specific element are not `NULL`, this is used
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* as a source of exponential frequency modulation (scale `1.f`/octave) for
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* that channel.
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*
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* If `y_inc` and the channel-specific element are not `NULL`, this is filled
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* with phase increment values for that channel.
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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) in `coeffs`.
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*
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* Default value: `1.f`.
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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) in `coeffs`.
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*
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* Default value: `0.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_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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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_reset_coeffs(&coeffs->portamento_coeffs);
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bw_one_pole_reset_state(&coeffs->portamento_coeffs, &coeffs->portamento_state, coeffs->portamento_target);
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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, float phase_0) {
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(void)coeffs;
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state->phase = phase_0;
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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 *BW_RESTRICT y, float *BW_RESTRICT 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 *BW_RESTRICT y, float *BW_RESTRICT y_phase_inc) {
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*y_phase_inc = bw_one_pole_get_y_z1(&coeffs->portamento_state) * bw_pow2f(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, size_t n_samples) {
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bw_phase_gen_update_coeffs_ctrl(coeffs);
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if (y != NULL) {
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if (x_mod != NULL) {
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if (y_phase_inc != NULL)
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for (size_t 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 (size_t 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 (size_t 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 (size_t 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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} else {
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if (x_mod != NULL) {
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if (y_phase_inc != NULL)
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for (size_t i = 0; i < n_samples; i++) {
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bw_phase_gen_update_coeffs_audio(coeffs);
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float v;
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bw_phase_gen_process1_mod(coeffs, state, x_mod[i], &v, y_phase_inc + i);
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}
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else
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for (size_t i = 0; i < n_samples; i++) {
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bw_phase_gen_update_coeffs_audio(coeffs);
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float v, v_phase_inc;
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bw_phase_gen_process1_mod(coeffs, state, x_mod[i], &v, &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 (size_t i = 0; i < n_samples; i++) {
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bw_phase_gen_update_coeffs_audio(coeffs);
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float v;
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bw_phase_gen_process1(coeffs, state, &v, y_phase_inc + i);
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}
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else
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for (size_t i = 0; i < n_samples; i++) {
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bw_phase_gen_update_coeffs_audio(coeffs);
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float v, v_phase_inc;
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bw_phase_gen_process1(coeffs, state, &v, &v_phase_inc);
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}
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}
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}
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}
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static inline void bw_phase_gen_process_multi(bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state * const *BW_RESTRICT state, const float * const *x_mod, float **y, float **y_phase_inc, size_t n_channels, size_t n_samples) {
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bw_phase_gen_update_coeffs_ctrl(coeffs);
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if (y != NULL) {
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if (x_mod != NULL) {
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if (y_phase_inc != NULL)
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for (size_t i = 0; i < n_samples; i++) {
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bw_phase_gen_update_coeffs_audio(coeffs);
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for (size_t j = 0; j < n_channels; j++) {
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float v, v_phase_inc;
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if (x_mod[j])
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bw_phase_gen_process1_mod(coeffs, state[j], x_mod[j][i], &v, &v_phase_inc);
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else
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bw_phase_gen_process1(coeffs, state[j], &v, &v_phase_inc);
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if (y[j])
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y[j][i] = v;
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if (y_phase_inc[j])
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y_phase_inc[j][i] = v_phase_inc;
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}
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}
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else
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for (size_t i = 0; i < n_samples; i++) {
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bw_phase_gen_update_coeffs_audio(coeffs);
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for (size_t j = 0; j < n_channels; j++) {
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float v, v_phase_inc;
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if (x_mod[j])
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bw_phase_gen_process1_mod(coeffs, state[j], x_mod[j][i], &v, &v_phase_inc);
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else
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bw_phase_gen_process1(coeffs, state[j], &v, &v_phase_inc);
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if (y[j])
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y[j][i] = v;
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}
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}
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} else {
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if (y_phase_inc != NULL)
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for (size_t i = 0; i < n_samples; i++) {
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bw_phase_gen_update_coeffs_audio(coeffs);
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for (size_t j = 0; j < n_channels; j++) {
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float v, v_phase_inc;
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bw_phase_gen_process1(coeffs, state[j], &v, &v_phase_inc);
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if (y[j])
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y[j][i] = v;
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if (y_phase_inc[j])
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y_phase_inc[j][i] = v_phase_inc;
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}
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}
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else
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for (size_t i = 0; i < n_samples; i++) {
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bw_phase_gen_update_coeffs_audio(coeffs);
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for (size_t j = 0; j < n_channels; j++) {
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float v, v_phase_inc;
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bw_phase_gen_process1(coeffs, state[j], &v, &v_phase_inc);
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if (y[j])
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y[j][i] = v;
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}
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}
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}
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} else {
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if (x_mod != NULL) {
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if (y_phase_inc != NULL)
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for (size_t i = 0; i < n_samples; i++) {
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bw_phase_gen_update_coeffs_audio(coeffs);
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for (size_t j = 0; j < n_channels; j++) {
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float v, v_phase_inc;
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if (x_mod[j])
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bw_phase_gen_process1_mod(coeffs, state[j], x_mod[j][i], &v, &v_phase_inc);
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else
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bw_phase_gen_process1(coeffs, state[j], &v, &v_phase_inc);
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if (y_phase_inc[j])
|
|
y_phase_inc[j][i] = v_phase_inc;
|
|
}
|
|
}
|
|
else
|
|
for (size_t i = 0; i < n_samples; i++) {
|
|
bw_phase_gen_update_coeffs_audio(coeffs);
|
|
for (size_t j = 0; j < n_channels; j++) {
|
|
float v, v_phase_inc;
|
|
if (x_mod[j])
|
|
bw_phase_gen_process1_mod(coeffs, state[j], x_mod[j][i], &v, &v_phase_inc);
|
|
else
|
|
bw_phase_gen_process1(coeffs, state[j], &v, &v_phase_inc);
|
|
}
|
|
}
|
|
} else {
|
|
if (y_phase_inc != NULL)
|
|
for (size_t i = 0; i < n_samples; i++) {
|
|
bw_phase_gen_update_coeffs_audio(coeffs);
|
|
for (size_t j = 0; j < n_channels; j++) {
|
|
float v, v_phase_inc;
|
|
bw_phase_gen_process1(coeffs, state[j], &v, &v_phase_inc);
|
|
if (y_phase_inc[j])
|
|
y_phase_inc[j][i] = v_phase_inc;
|
|
}
|
|
}
|
|
else
|
|
for (size_t i = 0; i < n_samples; i++) {
|
|
bw_phase_gen_update_coeffs_audio(coeffs);
|
|
for (size_t j = 0; j < n_channels; j++) {
|
|
float v, v_phase_inc;
|
|
bw_phase_gen_process1(coeffs, state[j], &v, &v_phase_inc);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void bw_phase_gen_set_frequency(bw_phase_gen_coeffs *BW_RESTRICT coeffs, float value) {
|
|
coeffs->frequency = value;
|
|
}
|
|
|
|
static inline void bw_phase_gen_set_portamento_tau(bw_phase_gen_coeffs *BW_RESTRICT coeffs, float value) {
|
|
bw_one_pole_set_tau(&coeffs->portamento_coeffs, value);
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
|
|
#include <array>
|
|
|
|
namespace Brickworks {
|
|
|
|
/*** Public C++ API ***/
|
|
|
|
/*! api_cpp {{{
|
|
* ##### Brickworks::PhaseGen
|
|
* ```>>> */
|
|
template<size_t N_CHANNELS>
|
|
class PhaseGen {
|
|
public:
|
|
PhaseGen();
|
|
|
|
void setSampleRate(float sampleRate);
|
|
void reset(float phase_0 = 0.f);
|
|
void process(
|
|
const float * const *x_mod,
|
|
float **y,
|
|
float **y_phase_inc,
|
|
size_t nSamples);
|
|
void process(
|
|
std::array<const float *, N_CHANNELS> x_mod,
|
|
std::array<float *, N_CHANNELS> y,
|
|
std::array<float *, N_CHANNELS> y_phase_inc,
|
|
size_t nSamples);
|
|
|
|
void setFrequency(float value);
|
|
void setPortamentoTau(float value);
|
|
/*! <<<...
|
|
* }
|
|
* ```
|
|
* }}} */
|
|
|
|
/*** Implementation ***/
|
|
|
|
/* WARNING: This part of the file is not part of the public API. Its content may
|
|
* change at any time in future versions. Please, do not use it directly. */
|
|
|
|
private:
|
|
bw_phase_gen_coeffs coeffs;
|
|
bw_phase_gen_state states[N_CHANNELS];
|
|
bw_phase_gen_state *statesP[N_CHANNELS];
|
|
};
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline PhaseGen<N_CHANNELS>::PhaseGen() {
|
|
bw_phase_gen_init(&coeffs);
|
|
for (size_t i = 0; i < N_CHANNELS; i++)
|
|
statesP[i] = states + i;
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void PhaseGen<N_CHANNELS>::setSampleRate(float sampleRate) {
|
|
bw_phase_gen_set_sample_rate(&coeffs, sampleRate);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void PhaseGen<N_CHANNELS>::reset(float phase_0) {
|
|
bw_phase_gen_reset_coeffs(&coeffs);
|
|
for (size_t i = 0; i < N_CHANNELS; i++)
|
|
bw_phase_gen_reset_state(&coeffs, states + i, phase_0);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void PhaseGen<N_CHANNELS>::process(
|
|
const float * const *x_mod,
|
|
float **y,
|
|
float **y_phase_inc,
|
|
size_t nSamples) {
|
|
bw_phase_gen_process_multi(&coeffs, statesP, x_mod, y, y_phase_inc, N_CHANNELS, nSamples);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void PhaseGen<N_CHANNELS>::process(
|
|
std::array<const float *, N_CHANNELS> x_mod,
|
|
std::array<float *, N_CHANNELS> y,
|
|
std::array<float *, N_CHANNELS> y_phase_inc,
|
|
size_t nSamples) {
|
|
process(x_mod.data(), y.data(), y_phase_inc.data(), nSamples);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void PhaseGen<N_CHANNELS>::setFrequency(float value) {
|
|
bw_phase_gen_set_frequency(&coeffs, value);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void PhaseGen<N_CHANNELS>::setPortamentoTau(float value) {
|
|
bw_phase_gen_set_portamento_tau(&coeffs, value);
|
|
}
|
|
|
|
}
|
|
#endif
|
|
|
|
#endif
|