187 lines
6.1 KiB
C
187 lines
6.1 KiB
C
/*
|
|
* Brickworks
|
|
*
|
|
* Copyright (C) 2022 Orastron Srl unipersonale
|
|
*
|
|
* Brickworks is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, version 3 of the License.
|
|
*
|
|
* Brickworks is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
*
|
|
* File author: Stefano D'Angelo
|
|
*/
|
|
|
|
/*!
|
|
* module_type {{{ dsp }}}
|
|
* version {{{ 0.2.0 }}}
|
|
* requires {{{ bw_config bw_common bw_math bw_one_pole }}}
|
|
* description {{{
|
|
* Envelope follower made of a full-wave rectifier followed by
|
|
* [bw_one_pole](bw_one_pole) one-pole filter (6 dB/oct).
|
|
*
|
|
* Unlike other dsp modules, you can directly access the parameters of the
|
|
* internal one-pole filter via the `bw_env_follow_get_one_pole()` function.
|
|
* }}}
|
|
* changelog {{{
|
|
* <ul>
|
|
* <li>Version <strong>0.2.0</strong>:
|
|
* <ul>
|
|
* <li>Refactored API.</li>
|
|
* </ul>
|
|
* </li>
|
|
* <li>Version <strong>0.1.0</strong>:
|
|
* <ul>
|
|
* <li>First release.</li>
|
|
* </ul>
|
|
* </li>
|
|
* </ul>
|
|
* }}}
|
|
*/
|
|
|
|
#ifndef _BW_ENV_FOLLOW_H
|
|
#define _BW_ENV_FOLLOW_H
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#include <bw_common.h>
|
|
|
|
/*! api {{{
|
|
* #### bw_env_follow_coeffs
|
|
* ```>>> */
|
|
typedef struct _bw_env_follow_coeffs bw_env_follow_coeffs;
|
|
/*! <<<```
|
|
* Coefficients.
|
|
*
|
|
* ### bw_env_follow_state
|
|
* >>> */
|
|
typedef struct _bw_env_follow_state bw_env_follow_state;
|
|
/*! <<<```
|
|
* State.
|
|
*
|
|
* #### bw_env_follow_init()
|
|
* ```>>> */
|
|
static inline void bw_env_follow_init(bw_env_follow_coeffs *BW_RESTRICT coeffs);
|
|
/*! <<<```
|
|
* Initializes `coeffs`.
|
|
*
|
|
* #### bw_env_follow_set_sample_rate()
|
|
* ```>>> */
|
|
static inline void bw_env_follow_set_sample_rate(bw_env_follow_coeffs *BW_RESTRICT coeffs, float sample_rate);
|
|
/*! <<<```
|
|
* Sets the `sample_rate` (Hz) value for the given `coeffs`.
|
|
*
|
|
* #### bw_one_pole_reset_state()
|
|
* ```>>> */
|
|
static inline void bw_env_follow_reset_state(const bw_env_follow_coeffs *BW_RESTRICT coeffs, bw_env_follow_state *BW_RESTRICT state);
|
|
/*! <<<```
|
|
* Resets the given `state` to the initial state using the given `coeffs`.
|
|
* >>> */
|
|
|
|
static inline void bw_env_follow_reset_coeffs(bw_env_follow_coeffs *BW_RESTRICT coeffs);
|
|
|
|
static inline void bw_env_follow_update_coeffs_ctrl(bw_env_follow_coeffs *BW_RESTRICT coeffs);
|
|
static inline void bw_env_follow_update_coeffs_audio(bw_env_follow_coeffs *BW_RESTRICT coeffs);
|
|
|
|
static inline float bw_env_follow_process1(const bw_env_follow_coeffs *BW_RESTRICT coeffs, bw_env_follow_state *BW_RESTRICT state, float x);
|
|
|
|
/*! ...
|
|
* #### bw_env_follow_process()
|
|
* ```>>> */
|
|
static inline void bw_env_follow_process(bw_env_follow_coeffs *BW_RESTRICT coeffs, bw_env_follow_state *BW_RESTRICT state, const float *x, float *y, int n_samples);
|
|
/*! <<<```
|
|
* Lets the given `instance` process `n_samples` samples from the input
|
|
* buffer `x` and fills the corresponding `n_samples` samples in the output
|
|
* buffer `y`.
|
|
* }}} */
|
|
|
|
static inline void bw_env_follow_set_attack_tau(bw_env_follow_coeffs *BW_RESTRICT coeffs, float value);
|
|
static inline void bw_env_follow_set_release_tau(bw_env_follow_coeffs *BW_RESTRICT coeffs, float value);
|
|
|
|
static inline float bw_env_follow_get_y_z1(const bw_env_follow_state *BW_RESTRICT state);
|
|
|
|
/*** Implementation ***/
|
|
|
|
#include <bw_math.h>
|
|
#include <bw_one_pole.h>
|
|
|
|
/* 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. */
|
|
|
|
struct _bw_env_follow_coeffs {
|
|
// Sub-components
|
|
bw_one_pole_coeffs one_pole_coeffs;
|
|
};
|
|
|
|
struct _bw_env_follow_state {
|
|
bw_one_pole_state one_pole_state;
|
|
};
|
|
|
|
static inline void bw_env_follow_init(bw_env_follow_coeffs *BW_RESTRICT coeffs) {
|
|
bw_one_pole_init(&coeffs->one_pole_coeffs);
|
|
}
|
|
|
|
static inline void bw_env_follow_set_sample_rate(bw_env_follow_coeffs *BW_RESTRICT coeffs, float sample_rate) {
|
|
bw_one_pole_set_sample_rate(&coeffs->one_pole_coeffs, sample_rate);
|
|
}
|
|
|
|
static inline void bw_env_follow_reset_coeffs(bw_env_follow_coeffs *BW_RESTRICT coeffs) {
|
|
bw_one_pole_reset_coeffs(&coeffs->one_pole_coeffs);
|
|
}
|
|
|
|
static inline void bw_env_follow_reset_state(const bw_env_follow_coeffs *BW_RESTRICT coeffs, bw_env_follow_state *BW_RESTRICT state) {
|
|
bw_one_pole_reset_state(&coeffs->one_pole_coeffs, &state->one_pole_state, 0.f);
|
|
}
|
|
|
|
static inline void bw_env_follow_update_coeffs_ctrl(bw_env_follow_coeffs *BW_RESTRICT coeffs) {
|
|
bw_one_pole_update_coeffs_ctrl(&coeffs->one_pole_coeffs);
|
|
}
|
|
|
|
static inline void bw_env_follow_update_coeffs_audio(bw_env_follow_coeffs *BW_RESTRICT coeffs) {
|
|
bw_one_pole_update_coeffs_audio(&coeffs->one_pole_coeffs);
|
|
}
|
|
|
|
static inline float bw_env_follow_process1(const bw_env_follow_coeffs *BW_RESTRICT coeffs, bw_env_follow_state *BW_RESTRICT state, float x) {
|
|
x = bw_absf(x);
|
|
return bw_one_pole_process1_asym(&coeffs->one_pole_coeffs, &state->one_pole_state, x);
|
|
}
|
|
|
|
static inline void bw_env_follow_process(bw_env_follow_coeffs *BW_RESTRICT coeffs, bw_env_follow_state *BW_RESTRICT state, const float *x, float *y, int n_samples) {
|
|
bw_env_follow_update_coeffs_ctrl(coeffs);
|
|
if (y)
|
|
for (int i = 0; i < n_samples; i++) {
|
|
bw_env_follow_update_coeffs_audio(coeffs);
|
|
y[i] = bw_env_follow_process1(coeffs, state, x[i]);
|
|
}
|
|
else
|
|
for (int i = 0; i < n_samples; i++) {
|
|
bw_env_follow_update_coeffs_audio(coeffs);
|
|
bw_env_follow_process1(coeffs, state, x[i]);
|
|
}
|
|
}
|
|
|
|
static inline void bw_env_follow_set_attack_tau(bw_env_follow_coeffs *BW_RESTRICT coeffs, float value) {
|
|
bw_one_pole_set_tau_up(&coeffs->one_pole_coeffs, value);
|
|
}
|
|
|
|
static inline void bw_env_follow_set_release_tau(bw_env_follow_coeffs *BW_RESTRICT coeffs, float value) {
|
|
bw_one_pole_set_tau_down(&coeffs->one_pole_coeffs, value);
|
|
}
|
|
|
|
static inline float bw_env_follow_get_y_z1(const bw_env_follow_state *BW_RESTRICT state) {
|
|
return bw_one_pole_get_y_z1(&state->one_pole_state);
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|