/* * Brickworks * * Copyright (C) 2022, 2023 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 * along with Brickworks. If not, see . * * File author: Stefano D'Angelo */ /*! * module_type {{{ dsp }}} * version {{{ 0.5.0 }}} * requires {{{ bw_common bw_config bw_gain bw_math bw_one_pole bw_svf }}} * description {{{ * Second-order multimode filter. * }}} * changelog {{{ * * }}} */ #ifndef _BW_MM2_H #define _BW_MM2_H #ifdef __cplusplus extern "C" { #endif #include /*! api {{{ * #### bw_mm2_coeffs * ```>>> */ typedef struct _bw_mm2_coeffs bw_mm2_coeffs; /*! <<<``` * Coefficients and related. * * #### bw_mm2_state * ```>>> */ typedef struct _bw_mm2_state bw_mm2_state; /*! <<<``` * Internal state and related. * * #### bw_mm2_init() * ```>>> */ static inline void bw_mm2_init(bw_mm2_coeffs *BW_RESTRICT coeffs); /*! <<<``` * Initializes input parameter values in `coeffs`. * * #### bw_mm2_set_sample_rate() * ```>>> */ static inline void bw_mm2_set_sample_rate(bw_mm2_coeffs *BW_RESTRICT coeffs, float sample_rate); /*! <<<``` * Sets the `sample_rate` (Hz) value in `coeffs`. * * #### bw_mm2_reset_coeffs() * ```>>> */ static inline void bw_mm2_reset_coeffs(bw_mm2_coeffs *BW_RESTRICT coeffs); /*! <<<``` * Resets coefficients in `coeffs` to assume their target values. * * #### bw_mm2_reset_state() * ```>>> */ static inline void bw_mm2_reset_state(const bw_mm2_coeffs *BW_RESTRICT coeffs, bw_mm2_state *BW_RESTRICT state, float x0); /*! <<<``` * Resets the given `state` to its initial values using the given `coeffs` * and the quiescent/initial input value `x0`. * * #### bw_mm2_update_coeffs_ctrl() * ```>>> */ static inline void bw_mm2_update_coeffs_ctrl(bw_mm2_coeffs *BW_RESTRICT coeffs); /*! <<<``` * Triggers control-rate update of coefficients in `coeffs`. * * #### bw_mm2_update_coeffs_audio() * ```>>> */ static inline void bw_mm2_update_coeffs_audio(bw_mm2_coeffs *BW_RESTRICT coeffs); /*! <<<``` * Triggers audio-rate update of coefficients in `coeffs`. * * #### bw_mm2_process1() * ```>>> */ static inline float bw_mm2_process1(const bw_mm2_coeffs *BW_RESTRICT coeffs, bw_mm2_state *BW_RESTRICT state, float x); /*! <<<``` * Processes one input sample `x` using `coeffs`, while using and updating * `state`. Returns the corresponding output sample. * * #### bw_mm2_process() * ```>>> */ static inline void bw_mm2_process(bw_mm2_coeffs *BW_RESTRICT coeffs, bw_mm2_state *BW_RESTRICT state, const float *x, float *y, int n_samples); /*! <<<``` * Processes the first `n_samples` of the input buffer `x` and fills the * first `n_samples` of the output buffer `y`, while using and updating both * `coeffs` and `state` (control and audio rate). * * #### bw_mm2_process_multi() * ```>>> */ static inline void bw_mm2_process_multi(bw_mm2_coeffs *BW_RESTRICT coeffs, bw_mm2_state **BW_RESTRICT state, const float **x, float **y, int n_channels, int n_samples); /*! <<<``` * Processes the first `n_samples` of the `n_channels` input buffers `x` and * fills the first `n_samples` of the `n_channels` output buffers `y`, while * using and updating both the common `coeffs` and each of the `n_channels` * `state`s (control and audio rate). * * #### bw_mm2_set_cutoff() * ```>>> */ static inline void bw_mm2_set_cutoff(bw_mm2_coeffs *BW_RESTRICT coeffs, float value); /*! <<<``` * Sets the cutoff frequency `value` (Hz) in `coeffs`. * * Default value: `1e3f`. * * #### bw_mm2_set_Q() * ```>>> */ static inline void bw_mm2_set_Q(bw_mm2_coeffs *BW_RESTRICT coeffs, float value); /*! <<<``` * Sets the quality factor to the given `value` in `coeffs`. * * `value` must be equal or bigger than `0.5f`. * * Default value: `0.5f`. * * #### bw_mm2_set_prewarp_at_cutoff() * ```>>> */ static inline void bw_mm2_set_prewarp_at_cutoff(bw_mm2_coeffs *BW_RESTRICT coeffs, char value); /*! <<<``` * Sets whether bilinear transform prewarping frequency should match the * cutoff frequency (non-`0`) or not (`0`). * * Default value: non-`0` (on). * * #### bw_mm2_set_prewarp_freq() * ```>>> */ static inline void bw_mm2_set_prewarp_freq(bw_mm2_coeffs *BW_RESTRICT coeffs, float value); /*! <<<``` * Sets the prewarping frequency `value` (Hz) in `coeffs`. * * Only used when the prewarp\_at\_cutoff parameter is off. * * Default value: `1e3f`. * * #### bw_mm2_set_coeff_x() * ```>>> */ static inline void bw_mm2_set_coeff_x(bw_mm2_coeffs *BW_RESTRICT coeffs, float value); /*! <<<``` * Sets the input mode coefficient `value` in `coeffs`. * * Default value: `1.f`. * * #### bw_mm2_set_coeff_lp() * ```>>> */ static inline void bw_mm2_set_coeff_lp(bw_mm2_coeffs *BW_RESTRICT coeffs, float value); /*! <<<``` * Sets the lowpass mode coefficient `value` in `coeffs`. * * Default value: `0.f`. * * #### bw_mm2_set_coeff_bp() * ```>>> */ static inline void bw_mm2_set_coeff_bp(bw_mm2_coeffs *BW_RESTRICT coeffs, float value); /*! <<<``` * Sets the bandpass mode coefficient `value` in `coeffs`. * * Default value: `0.f`. * * #### bw_mm2_set_coeff_hp() * ```>>> */ static inline void bw_mm2_set_coeff_hp(bw_mm2_coeffs *BW_RESTRICT coeffs, float value); /*! <<<``` * Sets the highpass mode coefficient `value` in `coeffs`. * * Default value: `0.f`. * }}} */ /*** 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. */ #include #include struct _bw_mm2_coeffs { // Sub-components bw_svf_coeffs svf_coeffs; bw_gain_coeffs gain_x_coeffs; bw_gain_coeffs gain_lp_coeffs; bw_gain_coeffs gain_bp_coeffs; bw_gain_coeffs gain_hp_coeffs; }; struct _bw_mm2_state { bw_svf_state svf_state; }; static inline void bw_mm2_init(bw_mm2_coeffs *BW_RESTRICT coeffs) { bw_svf_init(&coeffs->svf_coeffs); bw_gain_init(&coeffs->gain_x_coeffs); bw_gain_init(&coeffs->gain_lp_coeffs); bw_gain_init(&coeffs->gain_bp_coeffs); bw_gain_init(&coeffs->gain_hp_coeffs); bw_gain_set_smooth_tau(&coeffs->gain_x_coeffs, 0.005f); bw_gain_set_smooth_tau(&coeffs->gain_lp_coeffs, 0.005f); bw_gain_set_smooth_tau(&coeffs->gain_bp_coeffs, 0.005f); bw_gain_set_smooth_tau(&coeffs->gain_hp_coeffs, 0.005f); bw_gain_set_gain_lin(&coeffs->gain_x_coeffs, 1.f); bw_gain_set_gain_lin(&coeffs->gain_lp_coeffs, 0.f); bw_gain_set_gain_lin(&coeffs->gain_bp_coeffs, 0.f); bw_gain_set_gain_lin(&coeffs->gain_hp_coeffs, 0.f); } static inline void bw_mm2_set_sample_rate(bw_mm2_coeffs *BW_RESTRICT coeffs, float sample_rate) { bw_svf_set_sample_rate(&coeffs->svf_coeffs, sample_rate); bw_gain_set_sample_rate(&coeffs->gain_x_coeffs, sample_rate); bw_gain_set_sample_rate(&coeffs->gain_lp_coeffs, sample_rate); bw_gain_set_sample_rate(&coeffs->gain_bp_coeffs, sample_rate); bw_gain_set_sample_rate(&coeffs->gain_hp_coeffs, sample_rate); } static inline void bw_mm2_reset_coeffs(bw_mm2_coeffs *BW_RESTRICT coeffs) { bw_svf_reset_coeffs(&coeffs->svf_coeffs); bw_gain_reset_coeffs(&coeffs->gain_x_coeffs); bw_gain_reset_coeffs(&coeffs->gain_lp_coeffs); bw_gain_reset_coeffs(&coeffs->gain_bp_coeffs); bw_gain_reset_coeffs(&coeffs->gain_hp_coeffs); } static inline void bw_mm2_reset_state(const bw_mm2_coeffs *BW_RESTRICT coeffs, bw_mm2_state *BW_RESTRICT state, float x0) { bw_svf_reset_state(&coeffs->svf_coeffs, &state->svf_state, x0); } static inline void bw_mm2_update_coeffs_ctrl(bw_mm2_coeffs *BW_RESTRICT coeffs) { bw_svf_update_coeffs_ctrl(&coeffs->svf_coeffs); bw_gain_update_coeffs_ctrl(&coeffs->gain_x_coeffs); bw_gain_update_coeffs_ctrl(&coeffs->gain_lp_coeffs); bw_gain_update_coeffs_ctrl(&coeffs->gain_bp_coeffs); bw_gain_update_coeffs_ctrl(&coeffs->gain_hp_coeffs); } static inline void bw_mm2_update_coeffs_audio(bw_mm2_coeffs *BW_RESTRICT coeffs) { bw_svf_update_coeffs_audio(&coeffs->svf_coeffs); bw_gain_update_coeffs_audio(&coeffs->gain_x_coeffs); bw_gain_update_coeffs_audio(&coeffs->gain_lp_coeffs); bw_gain_update_coeffs_audio(&coeffs->gain_bp_coeffs); bw_gain_update_coeffs_audio(&coeffs->gain_hp_coeffs); } static inline float bw_mm2_process1(const bw_mm2_coeffs *BW_RESTRICT coeffs, bw_mm2_state *BW_RESTRICT state, float x) { float lp, bp, hp; bw_svf_process1(&coeffs->svf_coeffs, &state->svf_state, x, &lp, &bp, &hp); const float vx = bw_gain_process1(&coeffs->gain_x_coeffs, x); const float vlp = bw_gain_process1(&coeffs->gain_lp_coeffs, lp); const float vbp = bw_gain_process1(&coeffs->gain_bp_coeffs, bp); const float vhp = bw_gain_process1(&coeffs->gain_hp_coeffs, hp); return vx + vlp + vbp + vhp; } static inline void bw_mm2_process(bw_mm2_coeffs *BW_RESTRICT coeffs, bw_mm2_state *BW_RESTRICT state, const float *x, float *y, int n_samples) { bw_mm2_update_coeffs_ctrl(coeffs); for (int i = 0; i < n_samples; i++) { bw_mm2_update_coeffs_audio(coeffs); y[i] = bw_mm2_process1(coeffs, state, x[i]); } } static inline void bw_mm2_process_multi(bw_mm2_coeffs *BW_RESTRICT coeffs, bw_mm2_state **BW_RESTRICT state, const float **x, float **y, int n_channels, int n_samples) { bw_mm2_update_coeffs_ctrl(coeffs); for (int i = 0; i < n_samples; i++) { bw_mm2_update_coeffs_audio(coeffs); for (int j = 0; j < n_channels; j++) y[j][i] = bw_mm2_process1(coeffs, state[j], x[j][i]); } } static inline void bw_mm2_set_cutoff(bw_mm2_coeffs *BW_RESTRICT coeffs, float value) { bw_svf_set_cutoff(&coeffs->svf_coeffs, value); } static inline void bw_mm2_set_Q(bw_mm2_coeffs *BW_RESTRICT coeffs, float value) { bw_svf_set_Q(&coeffs->svf_coeffs, value); } static inline void bw_mm2_set_prewarp_at_cutoff(bw_mm2_coeffs *BW_RESTRICT coeffs, char value) { bw_svf_set_prewarp_at_cutoff(&coeffs->svf_coeffs, value); } static inline void bw_mm2_set_prewarp_freq(bw_mm2_coeffs *BW_RESTRICT coeffs, float value) { bw_svf_set_prewarp_freq(&coeffs->svf_coeffs, value); } static inline void bw_mm2_set_coeff_x(bw_mm2_coeffs *BW_RESTRICT coeffs, float value) { bw_gain_set_gain_lin(&coeffs->gain_x_coeffs, value); } static inline void bw_mm2_set_coeff_lp(bw_mm2_coeffs *BW_RESTRICT coeffs, float value) { bw_gain_set_gain_lin(&coeffs->gain_lp_coeffs, value); } static inline void bw_mm2_set_coeff_bp(bw_mm2_coeffs *BW_RESTRICT coeffs, float value) { bw_gain_set_gain_lin(&coeffs->gain_bp_coeffs, -value); } static inline void bw_mm2_set_coeff_hp(bw_mm2_coeffs *BW_RESTRICT coeffs, float value) { bw_gain_set_gain_lin(&coeffs->gain_hp_coeffs, value); } #ifdef __cplusplus } #endif #endif