214 lines
6.8 KiB
C
214 lines
6.8 KiB
C
/*
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* Brickworks
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*
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* Copyright (C) 2023 Orastron Srl unipersonale
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*
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* Brickworks is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* Brickworks is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Brickworks. If not, see <http://www.gnu.org/licenses/>.
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*
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* File author: Stefano D'Angelo
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*/
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/*!
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* module_type {{{ dsp }}}
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* version {{{ 0.5.0 }}}
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* requires {{{ bw_common bw_config bw_gain bw_math bw_one_pole }}}
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* description {{{
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* Stereo panner.
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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>Added <code>bw_pan_process_multi()</code>.</li>
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* <li><code>bw_pan_process()</code> does not accept <code>NULL</code>
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* buffers anymore.</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>0.3.0</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_PAN_H
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#define _BW_PAN_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_pan_coeffs
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* ```>>> */
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typedef struct _bw_pan_coeffs bw_pan_coeffs;
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/*! <<<```
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* Coefficients and related.
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*
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* #### bw_pan_init()
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* ```>>> */
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static inline void bw_pan_init(bw_pan_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_pan_set_sample_rate()
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* ```>>> */
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static inline void bw_pan_set_sample_rate(bw_pan_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_pan_reset_coeffs()
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* ```>>> */
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static inline void bw_pan_reset_coeffs(bw_pan_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_pan_update_coeffs_ctrl()
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* ```>>> */
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static inline void bw_pan_update_coeffs_ctrl(bw_pan_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_pan_update_coeffs_audio()
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* ```>>> */
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static inline void bw_pan_update_coeffs_audio(bw_pan_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_pan_process1()
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* ```>>> */
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static inline void bw_pan_process1(const bw_pan_coeffs *BW_RESTRICT coeffs, float x, float *BW_RESTRICT y_l, float *BW_RESTRICT y_r);
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/*! <<<```
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* Processes one input sample `x` using `coeffs`, while using and updating
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* `state`. The left and right output samples are put into `y_l` (left) and
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* `y_r` (right) respectively.
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*
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* #### bw_pan_process()
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* ```>>> */
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static inline void bw_pan_process(bw_pan_coeffs *BW_RESTRICT coeffs, const float *x, float *y_l, float *y_r, 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 buffers `y_l` (left) and `y_r` (right),
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* while using and updating `coeffs` (control and audio rate).
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*
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* #### bw_pan_process_multi()
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* ```>>> */
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static inline void bw_pan_process_multi(bw_pan_coeffs *BW_RESTRICT coeffs, const float **x, float **y_l, float **y_r, 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_l`
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* (left) and `y_r` (right), while using and updating the common `coeffs`
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* (control and audio rate).
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*
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* #### bw_pan_set_pan()
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* ```>>> */
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static inline void bw_pan_set_pan(bw_pan_coeffs *BW_RESTRICT coeffs, float value);
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/*! <<<```
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* Sets the panning `value`, where `-1.f` corresponds to hard left pan, `0.f`
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* to center pan, and `1.f` to hard right pan.
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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_gain.h>
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struct _bw_pan_coeffs {
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// Sub-components
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bw_gain_coeffs l_coeffs;
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bw_gain_coeffs r_coeffs;
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// Parameters
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float pan;
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float pan_prev;
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};
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static inline void bw_pan_init(bw_pan_coeffs *BW_RESTRICT coeffs) {
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bw_gain_init(&coeffs->l_coeffs);
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bw_gain_init(&coeffs->r_coeffs);
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coeffs->pan = 0.f;
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}
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static inline void bw_pan_set_sample_rate(bw_pan_coeffs *BW_RESTRICT coeffs, float sample_rate) {
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bw_gain_set_sample_rate(&coeffs->l_coeffs, sample_rate);
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bw_gain_set_sample_rate(&coeffs->r_coeffs, sample_rate);
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}
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static inline void _bw_pan_do_update_coeffs(bw_pan_coeffs *BW_RESTRICT coeffs, char force) {
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if (force || coeffs->pan != coeffs->pan_prev) {
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const float k = 0.125f * coeffs->pan + 0.125f;
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bw_gain_set_gain_lin(&coeffs->l_coeffs, bw_cos2pif_3(k));
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bw_gain_set_gain_lin(&coeffs->r_coeffs, bw_sin2pif_3(k));
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coeffs->pan_prev = coeffs->pan;
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}
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}
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static inline void bw_pan_reset_coeffs(bw_pan_coeffs *BW_RESTRICT coeffs) {
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_bw_pan_do_update_coeffs(coeffs, 1);
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bw_gain_reset_coeffs(&coeffs->l_coeffs);
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bw_gain_reset_coeffs(&coeffs->r_coeffs);
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}
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static inline void bw_pan_update_coeffs_ctrl(bw_pan_coeffs *BW_RESTRICT coeffs) {
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_bw_pan_do_update_coeffs(coeffs, 0);
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bw_gain_update_coeffs_ctrl(&coeffs->l_coeffs);
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bw_gain_update_coeffs_ctrl(&coeffs->r_coeffs);
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}
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static inline void bw_pan_update_coeffs_audio(bw_pan_coeffs *BW_RESTRICT coeffs) {
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bw_gain_update_coeffs_audio(&coeffs->l_coeffs);
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bw_gain_update_coeffs_audio(&coeffs->r_coeffs);
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}
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static inline void bw_pan_process1(const bw_pan_coeffs *BW_RESTRICT coeffs, float x, float *BW_RESTRICT y_l, float *BW_RESTRICT y_r) {
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*y_l = bw_gain_process1(&coeffs->l_coeffs, x);
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*y_r = bw_gain_process1(&coeffs->r_coeffs, x);
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}
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static inline void bw_pan_process(bw_pan_coeffs *BW_RESTRICT coeffs, const float *x, float *y_l, float *y_r, int n_samples) {
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bw_pan_update_coeffs_ctrl(coeffs);
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for (int i = 0; i < n_samples; i++) {
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bw_pan_update_coeffs_audio(coeffs);
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bw_pan_process1(coeffs, x[i], y_l + i, y_r + i);
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}
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}
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static inline void bw_pan_process_multi(bw_pan_coeffs *BW_RESTRICT coeffs, const float **x, float **y_l, float **y_r, int n_channels, int n_samples) {
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bw_pan_update_coeffs_ctrl(coeffs);
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for (int i = 0; i < n_samples; i++) {
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bw_pan_update_coeffs_audio(coeffs);
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for (int j = 0; j < n_channels; j++)
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bw_pan_process1(coeffs, x[j][i], y_l[j] + i, y_r[j] + i);
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}
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}
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static inline void bw_pan_set_pan(bw_pan_coeffs *BW_RESTRICT coeffs, float value) {
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coeffs->pan = 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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