951 lines
29 KiB
C++
951 lines
29 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_gain bw_math bw_mm2 bw_one_pole bw_svf }}}
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* description {{{
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* Second-order low shelf filter (12 dB/oct) with gain asymptotically
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* approaching unity as frequency increases.
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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>Added <code>bw_ls2_reset_state_multi()</code> and updated C++
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* API in this regard.</li>
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* <li>Now <code>bw_ls2_reset_state()</code> returns the initial output
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* value.</li>
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* <li>Added overloaded C++ <code>reset()</code> functions taking
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* arrays as arguments.</li>
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* <li><code>bw_ls2_process()</code> and
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* <code>bw_ls2_process_multi()</code> now use <code>size_t</code>
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* to count samples and channels.</li>
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* <li>Added more <code>const</code> and <code>BW_RESTRICT</code>
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* specifiers to input arguments and implementation.</li>
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* <li>Moved C++ code to C header.</li>
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* <li>Added overloaded 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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* <li>Added pragmas to silence bogus GCC uninitialized variable
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* warnings.</li>
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* <li>Clearly specified parameter validity ranges.</li>
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* <li>Added debugging code.</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_ls2_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>Added initial input value to
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* <code>bw_ls2_reset_state()</code>.</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_LS2_H
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#define BW_LS2_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_ls2_coeffs
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* ```>>> */
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typedef struct bw_ls2_coeffs bw_ls2_coeffs;
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/*! <<<```
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* Coefficients and related.
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*
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* #### bw_ls2_state
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* ```>>> */
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typedef struct bw_ls2_state bw_ls2_state;
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/*! <<<```
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* Internal state and related.
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*
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* #### bw_ls2_init()
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* ```>>> */
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static inline void bw_ls2_init(
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bw_ls2_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_ls2_set_sample_rate()
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* ```>>> */
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static inline void bw_ls2_set_sample_rate(
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bw_ls2_coeffs * BW_RESTRICT coeffs,
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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_ls2_reset_coeffs()
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* ```>>> */
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static inline void bw_ls2_reset_coeffs(
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bw_ls2_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_ls2_reset_state()
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* ```>>> */
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static inline float bw_ls2_reset_state(
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const bw_ls2_coeffs * BW_RESTRICT coeffs,
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bw_ls2_state * BW_RESTRICT state,
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float x_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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* and the initial input value `x_0`.
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*
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* Returns the corresponding initial output value.
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*
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* #### bw_ls2_reset_state_multi()
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* ```>>> */
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static inline void bw_ls2_reset_state_multi(
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const bw_ls2_coeffs * BW_RESTRICT coeffs,
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bw_ls2_state * BW_RESTRICT const * BW_RESTRICT state,
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const float * x_0,
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float * y_0,
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size_t n_channels);
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/*! <<<```
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* Resets each of the `n_channels` `state`s to its initial values using the
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* given `coeffs` and the corresponding initial input value in the `x_0`
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* array.
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*
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* The corresponding initial output values are written into the `y_0` array,
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* if not `NULL`.
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*
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* #### bw_ls2_update_coeffs_ctrl()
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* ```>>> */
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static inline void bw_ls2_update_coeffs_ctrl(
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bw_ls2_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_ls2_update_coeffs_audio()
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* ```>>> */
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static inline void bw_ls2_update_coeffs_audio(
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bw_ls2_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_ls2_process1()
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* ```>>> */
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static inline float bw_ls2_process1(
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const bw_ls2_coeffs * BW_RESTRICT coeffs,
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bw_ls2_state * BW_RESTRICT state,
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float x);
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/*! <<<```
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* Processes one input sample `x` using `coeffs`, while using and updating
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* `state`. Returns the corresponding output sample.
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*
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* #### bw_ls2_process()
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* ```>>> */
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static inline void bw_ls2_process(
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bw_ls2_coeffs * BW_RESTRICT coeffs,
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bw_ls2_state * BW_RESTRICT state,
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const float * x,
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float * y,
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size_t 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 buffer `y`, while using and updating both
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* `coeffs` and `state` (control and audio rate).
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*
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* #### bw_ls2_process_multi()
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* ```>>> */
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static inline void bw_ls2_process_multi(
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bw_ls2_coeffs * BW_RESTRICT coeffs,
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bw_ls2_state * BW_RESTRICT const * BW_RESTRICT state,
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const float * const * x,
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float * const * y,
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size_t n_channels,
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size_t 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`, while
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* using and updating both the common `coeffs` and each of the `n_channels`
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* `state`s (control and audio rate).
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*
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* #### bw_ls2_set_cutoff()
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* ```>>> */
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static inline void bw_ls2_set_cutoff(
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bw_ls2_coeffs * BW_RESTRICT coeffs,
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float value);
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/*! <<<```
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* Sets the cutoff frequency `value` (Hz) in `coeffs`.
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*
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* `value` must be finite and positive.
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*
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* By the time ``bw_ls2_reset_coeffs(), `bw_ls2_update_coeffs_ctrl()`,
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* `bw_ls2_update_coeffs_audio()`, `bw_ls2_process1()`, `bw_ls2_process()`,
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* or `bw_ls2_process_multi()` is called,
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* `cutoff * bw_rcpf(bw_sqrtf(bw_sqrtf(dc_gain)))` must be in [`1e-6f`,
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* `1e12f`].
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*
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* Default value: `1e3f`.
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*
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* #### bw_ls2_set_Q()
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* ```>>> */
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static inline void bw_ls2_set_Q(
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bw_ls2_coeffs * BW_RESTRICT coeffs,
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float value);
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/*! <<<```
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* Sets the quality factor to the given `value` in `coeffs`.
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*
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* Valid range: [`1e-6f`, `1e6f`].
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*
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* Default value: `0.5f`.
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*
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* #### bw_ls2_set_prewarp_at_cutoff()
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* ```>>> */
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static inline void bw_ls2_set_prewarp_at_cutoff(
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bw_ls2_coeffs * BW_RESTRICT coeffs,
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char value);
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/*! <<<```
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* Sets whether bilinear transform prewarping frequency should match the
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* cutoff frequency (non-`0`) or not (`0`).
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*
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* Default value: non-`0` (on).
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*
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* #### bw_ls2_set_prewarp_freq()
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* ```>>> */
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static inline void bw_ls2_set_prewarp_freq(
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bw_ls2_coeffs * BW_RESTRICT coeffs,
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float value);
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/*! <<<```
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* Sets the prewarping frequency `value` (Hz) in `coeffs`.
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*
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* Only used when the prewarp\_at\_cutoff parameter is off and however
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* internally limited to avoid instability.
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*
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* Valid range: [`1e-6f`, `1e12f`].
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*
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* Default value: `1e3f`.
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*
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* #### bw_ls2_set_dc_gain_lin()
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* ```>>> */
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static inline void bw_ls2_set_dc_gain_lin(
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bw_ls2_coeffs * BW_RESTRICT coeffs,
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float value);
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/*! <<<```
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* Sets the dc gain parameter to the given `value` (linear gain) in `coeffs`.
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*
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* Valid range: [`1e-30f`, `1e30f`].
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*
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* By the time ``bw_ls2_reset_coeffs(), `bw_ls2_update_coeffs_ctrl()`,
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* `bw_ls2_update_coeffs_audio()`, `bw_ls2_process1()`, `bw_ls2_process()`,
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* or `bw_ls2_process_multi()` is called,
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* `cutoff * bw_rcpf(bw_sqrtf(bw_sqrtf(dc_gain)))` must be in [`1e-6f`,
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* `1e12f`].
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*
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* Default value: `1.f`.
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*
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* #### bw_ls2_set_dc_gain_dB()
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* ```>>> */
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static inline void bw_ls2_set_dc_gain_dB(
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bw_ls2_coeffs * BW_RESTRICT coeffs,
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float value);
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/*! <<<```
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* Sets the dc gain parameter to the given `value` (dB) in `coeffs`.
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*
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* Valid range: [`-600.f`, `600.f`].
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*
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* By the time ``bw_ls2_reset_coeffs(), `bw_ls2_update_coeffs_ctrl()`,
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* `bw_ls2_update_coeffs_audio()`, `bw_ls2_process1()`, `bw_ls2_process()`,
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* or `bw_ls2_process_multi()` is called,
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* `cutoff * bw_rcpf(bw_sqrtf(bw_sqrtf(dc_gain)))` must be in [`1e-6f`,
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* `1e12f`].
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*
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* Default value: `0.f`.
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*
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* #### bw_ls2_coeffs_is_valid()
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* ```>>> */
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static inline char bw_ls2_coeffs_is_valid(
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const bw_ls2_coeffs * BW_RESTRICT coeffs);
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/*! <<<```
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* Tries to determine whether `coeffs` is valid and returns non-`0` if it
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* seems to be the case and `0` if it is certainly not. False positives are
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* possible, false negatives are not.
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*
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* `coeffs` must at least point to a readable memory block of size greater
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* than or equal to that of `bw_ls2_coeffs`.
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*
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* #### bw_ls2_state_is_valid()
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* ```>>> */
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static inline char bw_ls2_state_is_valid(
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const bw_ls2_coeffs * BW_RESTRICT coeffs,
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const bw_ls2_state * BW_RESTRICT state);
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/*! <<<```
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* Tries to determine whether `state` is valid and returns non-`0` if it
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* seems to be the case and `0` if it is certainly not. False positives are
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* possible, false negatives are not.
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*
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* If `coeffs` is not `NULL` extra cross-checks might be performed (`state`
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* is supposed to be associated to `coeffs`).
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*
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* `state` must at least point to a readable memory block of size greater
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* than or equal to that of `bw_ls2_state`.
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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_mm2.h>
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#include <bw_math.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef BW_DEBUG_DEEP
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enum bw_ls2_coeffs_state {
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bw_ls2_coeffs_state_invalid,
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bw_ls2_coeffs_state_init,
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bw_ls2_coeffs_state_set_sample_rate,
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bw_ls2_coeffs_state_reset_coeffs
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};
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#endif
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struct bw_ls2_coeffs {
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#ifdef BW_DEBUG_DEEP
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uint32_t hash;
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enum bw_ls2_coeffs_state state;
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uint32_t reset_id;
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#endif
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// Sub-components
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bw_mm2_coeffs mm2_coeffs;
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// Coefficients
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float sg;
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float issg;
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// Parameters
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float cutoff;
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float prewarp_k;
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float prewarp_freq;
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float dc_gain;
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int param_changed;
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};
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struct bw_ls2_state {
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#ifdef BW_DEBUG_DEEP
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uint32_t hash;
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uint32_t coeffs_reset_id;
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#endif
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// Sub-components
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bw_mm2_state mm2_state;
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};
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#define BW_LS2_PARAM_CUTOFF 1
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#define BW_LS2_PARAM_DC_GAIN (1<<1)
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static inline void bw_ls2_init(
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bw_ls2_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != NULL);
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bw_mm2_init(&coeffs->mm2_coeffs);
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bw_mm2_set_prewarp_at_cutoff(&coeffs->mm2_coeffs, 0);
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coeffs->cutoff = 1e3f;
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coeffs->prewarp_k = 1.f;
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coeffs->prewarp_freq = 1.f;
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coeffs->dc_gain = 1.f;
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#ifdef BW_DEBUG_DEEP
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coeffs->hash = bw_hash_sdbm("bw_ls2_coeffs");
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coeffs->state = bw_ls2_coeffs_state_init;
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coeffs->reset_id = coeffs->hash + 1;
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#endif
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BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state == bw_ls2_coeffs_state_init);
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}
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static inline void bw_ls2_set_sample_rate(
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bw_ls2_coeffs * BW_RESTRICT coeffs,
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float sample_rate) {
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BW_ASSERT(coeffs != NULL);
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BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_init);
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BW_ASSERT(bw_is_finite(sample_rate) && sample_rate > 0.f);
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bw_mm2_set_sample_rate(&coeffs->mm2_coeffs, sample_rate);
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#ifdef BW_DEBUG_DEEP
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coeffs->state = bw_ls2_coeffs_state_set_sample_rate;
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#endif
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BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state == bw_ls2_coeffs_state_set_sample_rate);
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}
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static inline void bw_ls2_update_mm2_params(
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bw_ls2_coeffs * BW_RESTRICT coeffs) {
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bw_mm2_set_prewarp_freq(&coeffs->mm2_coeffs, coeffs->prewarp_freq + coeffs->prewarp_k * (coeffs->cutoff - coeffs->prewarp_freq));
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if (coeffs->param_changed) {
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if (coeffs->param_changed & BW_LS2_PARAM_DC_GAIN) {
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coeffs->sg = bw_sqrtf(coeffs->dc_gain);
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coeffs->issg = bw_rcpf(bw_sqrtf(coeffs->sg));
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bw_mm2_set_coeff_x(&coeffs->mm2_coeffs, coeffs->sg);
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bw_mm2_set_coeff_lp(&coeffs->mm2_coeffs, coeffs->dc_gain - coeffs->sg);
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bw_mm2_set_coeff_hp(&coeffs->mm2_coeffs, 1.f - coeffs->sg);
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}
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bw_mm2_set_cutoff(&coeffs->mm2_coeffs, coeffs->cutoff * coeffs->issg);
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coeffs->param_changed = 0;
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}
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}
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static inline void bw_ls2_reset_coeffs(
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bw_ls2_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != NULL);
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BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_set_sample_rate);
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BW_ASSERT_DEEP(coeffs->cutoff * bw_rcpf(bw_sqrtf(bw_sqrtf(coeffs->dc_gain))) >= 1e-6f && coeffs->cutoff * bw_rcpf(bw_sqrtf(bw_sqrtf(coeffs->dc_gain))) <= 1e12f);
|
|
|
|
coeffs->param_changed = ~0;
|
|
bw_ls2_update_mm2_params(coeffs);
|
|
bw_mm2_reset_coeffs(&coeffs->mm2_coeffs);
|
|
|
|
#ifdef BW_DEBUG_DEEP
|
|
coeffs->state = bw_ls2_coeffs_state_reset_coeffs;
|
|
coeffs->reset_id++;
|
|
#endif
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state == bw_ls2_coeffs_state_reset_coeffs);
|
|
}
|
|
|
|
static inline float bw_ls2_reset_state(
|
|
const bw_ls2_coeffs * BW_RESTRICT coeffs,
|
|
bw_ls2_state * BW_RESTRICT state,
|
|
float x_0) {
|
|
BW_ASSERT(coeffs != NULL);
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_reset_coeffs);
|
|
BW_ASSERT(state != NULL);
|
|
BW_ASSERT(bw_is_finite(x_0));
|
|
|
|
const float y = bw_mm2_reset_state(&coeffs->mm2_coeffs, &state->mm2_state, x_0);
|
|
|
|
#ifdef BW_DEBUG_DEEP
|
|
state->hash = bw_hash_sdbm("bw_ls2_state");
|
|
state->coeffs_reset_id = coeffs->reset_id;
|
|
#endif
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_reset_coeffs);
|
|
BW_ASSERT_DEEP(bw_ls2_state_is_valid(coeffs, state));
|
|
BW_ASSERT(bw_is_finite(y));
|
|
|
|
return y;
|
|
}
|
|
|
|
static inline void bw_ls2_reset_state_multi(
|
|
const bw_ls2_coeffs * BW_RESTRICT coeffs,
|
|
bw_ls2_state * BW_RESTRICT const * BW_RESTRICT state,
|
|
const float * x_0,
|
|
float * y_0,
|
|
size_t n_channels) {
|
|
BW_ASSERT(coeffs != NULL);
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_reset_coeffs);
|
|
BW_ASSERT(state != NULL);
|
|
#ifndef BW_NO_DEBUG
|
|
for (size_t i = 0; i < n_channels; i++)
|
|
for (size_t j = i + 1; j < n_channels; j++)
|
|
BW_ASSERT(state[i] != state[j]);
|
|
#endif
|
|
BW_ASSERT(x_0 != NULL);
|
|
|
|
if (y_0 != NULL)
|
|
for (size_t i = 0; i < n_channels; i++)
|
|
y_0[i] = bw_ls2_reset_state(coeffs, state[i], x_0[i]);
|
|
else
|
|
for (size_t i = 0; i < n_channels; i++)
|
|
bw_ls2_reset_state(coeffs, state[i], x_0[i]);
|
|
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_reset_coeffs);
|
|
BW_ASSERT_DEEP(y_0 != NULL ? bw_has_only_finite(y_0, n_channels) : 1);
|
|
}
|
|
|
|
static inline void bw_ls2_update_coeffs_ctrl(
|
|
bw_ls2_coeffs * BW_RESTRICT coeffs) {
|
|
BW_ASSERT(coeffs != NULL);
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_reset_coeffs);
|
|
BW_ASSERT_DEEP(coeffs->cutoff * bw_rcpf(bw_sqrtf(bw_sqrtf(coeffs->dc_gain))) >= 1e-6f && coeffs->cutoff * bw_rcpf(bw_sqrtf(bw_sqrtf(coeffs->dc_gain))) <= 1e12f);
|
|
|
|
bw_ls2_update_mm2_params(coeffs);
|
|
bw_mm2_update_coeffs_ctrl(&coeffs->mm2_coeffs);
|
|
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_reset_coeffs);
|
|
}
|
|
|
|
static inline void bw_ls2_update_coeffs_audio(
|
|
bw_ls2_coeffs * BW_RESTRICT coeffs) {
|
|
BW_ASSERT(coeffs != NULL);
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_reset_coeffs);
|
|
BW_ASSERT_DEEP(coeffs->cutoff * bw_rcpf(bw_sqrtf(bw_sqrtf(coeffs->dc_gain))) >= 1e-6f && coeffs->cutoff * bw_rcpf(bw_sqrtf(bw_sqrtf(coeffs->dc_gain))) <= 1e12f);
|
|
|
|
bw_mm2_update_coeffs_audio(&coeffs->mm2_coeffs);
|
|
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_reset_coeffs);
|
|
}
|
|
|
|
static inline float bw_ls2_process1(
|
|
const bw_ls2_coeffs * BW_RESTRICT coeffs,
|
|
bw_ls2_state * BW_RESTRICT state,
|
|
float x) {
|
|
BW_ASSERT(coeffs != NULL);
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_reset_coeffs);
|
|
BW_ASSERT_DEEP(coeffs->cutoff * bw_rcpf(bw_sqrtf(bw_sqrtf(coeffs->dc_gain))) >= 1e-6f && coeffs->cutoff * bw_rcpf(bw_sqrtf(bw_sqrtf(coeffs->dc_gain))) <= 1e12f);
|
|
BW_ASSERT(state != NULL);
|
|
BW_ASSERT_DEEP(bw_ls2_state_is_valid(coeffs, state));
|
|
BW_ASSERT(bw_is_finite(x));
|
|
|
|
const float y = bw_mm2_process1(&coeffs->mm2_coeffs, &state->mm2_state, x);
|
|
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_reset_coeffs);
|
|
BW_ASSERT_DEEP(bw_ls2_state_is_valid(coeffs, state));
|
|
BW_ASSERT(bw_is_finite(y));
|
|
|
|
return y;
|
|
}
|
|
|
|
static inline void bw_ls2_process(
|
|
bw_ls2_coeffs * BW_RESTRICT coeffs,
|
|
bw_ls2_state * BW_RESTRICT state,
|
|
const float * x,
|
|
float * y,
|
|
size_t n_samples) {
|
|
BW_ASSERT(coeffs != NULL);
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_reset_coeffs);
|
|
BW_ASSERT_DEEP(coeffs->cutoff * bw_rcpf(bw_sqrtf(bw_sqrtf(coeffs->dc_gain))) >= 1e-6f && coeffs->cutoff * bw_rcpf(bw_sqrtf(bw_sqrtf(coeffs->dc_gain))) <= 1e12f);
|
|
BW_ASSERT(state != NULL);
|
|
BW_ASSERT_DEEP(bw_ls2_state_is_valid(coeffs, state));
|
|
BW_ASSERT(x != NULL);
|
|
BW_ASSERT_DEEP(bw_has_only_finite(x, n_samples));
|
|
BW_ASSERT(y != NULL);
|
|
|
|
bw_ls2_update_coeffs_ctrl(coeffs);
|
|
for (size_t i = 0; i < n_samples; i++) {
|
|
bw_ls2_update_coeffs_audio(coeffs);
|
|
y[i] = bw_ls2_process1(coeffs, state, x[i]);
|
|
}
|
|
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_reset_coeffs);
|
|
BW_ASSERT_DEEP(bw_ls2_state_is_valid(coeffs, state));
|
|
BW_ASSERT_DEEP(bw_has_only_finite(y, n_samples));
|
|
}
|
|
|
|
static inline void bw_ls2_process_multi(
|
|
bw_ls2_coeffs * BW_RESTRICT coeffs,
|
|
bw_ls2_state * BW_RESTRICT const * BW_RESTRICT state,
|
|
const float * const * x,
|
|
float * const * y,
|
|
size_t n_channels,
|
|
size_t n_samples) {
|
|
BW_ASSERT(coeffs != NULL);
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_reset_coeffs);
|
|
BW_ASSERT_DEEP(coeffs->cutoff * bw_rcpf(bw_sqrtf(bw_sqrtf(coeffs->dc_gain))) >= 1e-6f && coeffs->cutoff * bw_rcpf(bw_sqrtf(bw_sqrtf(coeffs->dc_gain))) <= 1e12f);
|
|
BW_ASSERT(state != NULL);
|
|
#ifndef BW_NO_DEBUG
|
|
for (size_t i = 0; i < n_channels; i++)
|
|
for (size_t j = i + 1; j < n_channels; j++)
|
|
BW_ASSERT(state[i] != state[j]);
|
|
#endif
|
|
BW_ASSERT(x != NULL);
|
|
BW_ASSERT(y != NULL);
|
|
#ifndef BW_NO_DEBUG
|
|
for (size_t i = 0; i < n_channels; i++)
|
|
for (size_t j = i + 1; j < n_channels; j++)
|
|
BW_ASSERT(y[i] != y[j]);
|
|
#endif
|
|
|
|
bw_ls2_update_coeffs_ctrl(coeffs);
|
|
for (size_t i = 0; i < n_samples; i++) {
|
|
bw_ls2_update_coeffs_audio(coeffs);
|
|
for (size_t j = 0; j < n_channels; j++)
|
|
y[j][i] = bw_ls2_process1(coeffs, state[j], x[j][i]);
|
|
}
|
|
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_reset_coeffs);
|
|
}
|
|
|
|
static inline void bw_ls2_set_cutoff(
|
|
bw_ls2_coeffs * BW_RESTRICT coeffs,
|
|
float value) {
|
|
BW_ASSERT(coeffs != NULL);
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_init);
|
|
BW_ASSERT(bw_is_finite(value));
|
|
BW_ASSERT(value > 0.f);
|
|
|
|
if (coeffs->cutoff != value) {
|
|
coeffs->cutoff = value;
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wuninitialized"
|
|
coeffs->param_changed |= BW_LS2_PARAM_CUTOFF;
|
|
#pragma GCC diagnostic pop
|
|
}
|
|
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_init);
|
|
}
|
|
|
|
static inline void bw_ls2_set_Q(bw_ls2_coeffs *BW_RESTRICT coeffs, float value) {
|
|
BW_ASSERT(coeffs != NULL);
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_init);
|
|
BW_ASSERT(bw_is_finite(value));
|
|
BW_ASSERT(value >= 1e-6f && value <= 1e6f);
|
|
|
|
bw_mm2_set_Q(&coeffs->mm2_coeffs, value);
|
|
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_init);
|
|
}
|
|
|
|
static inline void bw_ls2_set_prewarp_at_cutoff(
|
|
bw_ls2_coeffs * BW_RESTRICT coeffs,
|
|
char value) {
|
|
BW_ASSERT(coeffs != NULL);
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_init);
|
|
|
|
bw_mm2_set_prewarp_at_cutoff(&coeffs->mm2_coeffs, value);
|
|
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_init);
|
|
}
|
|
|
|
static inline void bw_ls2_set_prewarp_freq(
|
|
bw_ls2_coeffs * BW_RESTRICT coeffs,
|
|
float value) {
|
|
BW_ASSERT(coeffs != NULL);
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_init);
|
|
BW_ASSERT(bw_is_finite(value));
|
|
BW_ASSERT(value >= 1e-6f && value <= 1e12f);
|
|
|
|
coeffs->prewarp_freq = value;
|
|
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_init);
|
|
}
|
|
|
|
static inline void bw_ls2_set_dc_gain_lin(bw_ls2_coeffs *BW_RESTRICT coeffs, float value) {
|
|
BW_ASSERT(coeffs != NULL);
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_init);
|
|
BW_ASSERT(bw_is_finite(value));
|
|
BW_ASSERT(value >= 1e-30f && value <= 1e30f);
|
|
|
|
if (coeffs->dc_gain != value) {
|
|
coeffs->dc_gain = value;
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wuninitialized"
|
|
coeffs->param_changed |= BW_LS2_PARAM_DC_GAIN;
|
|
#pragma GCC diagnostic pop
|
|
}
|
|
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_init);
|
|
}
|
|
|
|
static inline void bw_ls2_set_dc_gain_dB(bw_ls2_coeffs *BW_RESTRICT coeffs, float value) {
|
|
BW_ASSERT(coeffs != NULL);
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_init);
|
|
BW_ASSERT(bw_is_finite(value));
|
|
BW_ASSERT(value >= -600.f && value <= 600.f);
|
|
|
|
bw_ls2_set_dc_gain_lin(coeffs, bw_dB2linf(value));
|
|
|
|
BW_ASSERT_DEEP(bw_ls2_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_ls2_coeffs_state_init);
|
|
}
|
|
|
|
static inline char bw_ls2_coeffs_is_valid(
|
|
const bw_ls2_coeffs * BW_RESTRICT coeffs) {
|
|
BW_ASSERT(coeffs != NULL);
|
|
|
|
#ifdef BW_DEBUG_DEEP
|
|
if (coeffs->hash != bw_hash_sdbm("bw_ls2_coeffs"))
|
|
return 0;
|
|
if (coeffs->state < bw_ls2_coeffs_state_init || coeffs->state > bw_ls2_coeffs_state_reset_coeffs)
|
|
return 0;
|
|
#endif
|
|
|
|
if (!bw_is_finite(coeffs->cutoff) || coeffs->cutoff <= 0.f)
|
|
return 0;
|
|
if (!bw_is_finite(coeffs->prewarp_k) || (coeffs->prewarp_k != 0.f && coeffs->prewarp_k != 1.f))
|
|
return 0;
|
|
if (!bw_is_finite(coeffs->prewarp_freq) || coeffs->prewarp_freq < 1e-6f || coeffs->prewarp_freq > 1e12f)
|
|
return 0;
|
|
if (!bw_is_finite(coeffs->dc_gain) || coeffs->dc_gain < 1e-30f || coeffs->dc_gain > 1e30f)
|
|
return 0;
|
|
|
|
#ifdef BW_DEBUG_DEEP
|
|
if (coeffs->state >= bw_ls2_coeffs_state_reset_coeffs) {
|
|
if (!bw_is_finite(coeffs->sg) || coeffs->sg < 0.f)
|
|
return 0;
|
|
if (!bw_is_finite(coeffs->issg) || coeffs->issg < 0.f)
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
return bw_mm2_coeffs_is_valid(&coeffs->mm2_coeffs);
|
|
}
|
|
|
|
static inline char bw_ls2_state_is_valid(
|
|
const bw_ls2_coeffs * BW_RESTRICT coeffs,
|
|
const bw_ls2_state * BW_RESTRICT state) {
|
|
BW_ASSERT(state != NULL);
|
|
|
|
#ifdef BW_DEBUG_DEEP
|
|
if (state->hash != bw_hash_sdbm("bw_ls2_state"))
|
|
return 0;
|
|
|
|
if (coeffs != NULL && coeffs->reset_id != state->coeffs_reset_id)
|
|
return 0;
|
|
#endif
|
|
|
|
return bw_mm2_state_is_valid(coeffs ? &coeffs->mm2_coeffs : NULL, &state->mm2_state);
|
|
}
|
|
|
|
#undef BW_LS2_PARAM_CUTOFF
|
|
#undef BW_LS2_PARAM_DC_GAIN
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
|
|
#include <array>
|
|
|
|
namespace Brickworks {
|
|
|
|
/*** Public C++ API ***/
|
|
|
|
/*! api_cpp {{{
|
|
* ##### Brickworks::LS2
|
|
* ```>>> */
|
|
template<size_t N_CHANNELS>
|
|
class LS2 {
|
|
public:
|
|
LS2();
|
|
|
|
void setSampleRate(
|
|
float sampleRate);
|
|
|
|
void reset(
|
|
float x0 = 0.f,
|
|
float * BW_RESTRICT y0 = nullptr);
|
|
|
|
void reset(
|
|
float x0,
|
|
std::array<float, N_CHANNELS> * BW_RESTRICT y0);
|
|
|
|
void reset(
|
|
const float * x0,
|
|
float * y0 = nullptr);
|
|
|
|
void reset(
|
|
std::array<float, N_CHANNELS> x0,
|
|
std::array<float, N_CHANNELS> * BW_RESTRICT y0 = nullptr);
|
|
|
|
void process(
|
|
const float * const * x,
|
|
float * const * y,
|
|
size_t nSamples);
|
|
|
|
void process(
|
|
std::array<const float *, N_CHANNELS> x,
|
|
std::array<float *, N_CHANNELS> y,
|
|
size_t nSamples);
|
|
|
|
void setCutoff(
|
|
float value);
|
|
|
|
void setQ(
|
|
float value);
|
|
|
|
void setPrewarpAtCutoff(
|
|
bool value);
|
|
|
|
void setPrewarpFreq(
|
|
float value);
|
|
|
|
void setDcGainLin(
|
|
float value);
|
|
|
|
void setDcGainDB(
|
|
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_ls2_coeffs coeffs;
|
|
bw_ls2_state states[N_CHANNELS];
|
|
bw_ls2_state * BW_RESTRICT statesP[N_CHANNELS];
|
|
};
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline LS2<N_CHANNELS>::LS2() {
|
|
bw_ls2_init(&coeffs);
|
|
for (size_t i = 0; i < N_CHANNELS; i++)
|
|
statesP[i] = states + i;
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void LS2<N_CHANNELS>::setSampleRate(
|
|
float sampleRate) {
|
|
bw_ls2_set_sample_rate(&coeffs, sampleRate);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void LS2<N_CHANNELS>::reset(
|
|
float x0,
|
|
float * BW_RESTRICT y0) {
|
|
bw_ls2_reset_coeffs(&coeffs);
|
|
if (y0 != nullptr)
|
|
for (size_t i = 0; i < N_CHANNELS; i++)
|
|
y0[i] = bw_ls2_reset_state(&coeffs, states + i, x0);
|
|
else
|
|
for (size_t i = 0; i < N_CHANNELS; i++)
|
|
bw_ls2_reset_state(&coeffs, states + i, x0);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void LS2<N_CHANNELS>::reset(
|
|
float x0,
|
|
std::array<float, N_CHANNELS> * BW_RESTRICT y0) {
|
|
reset(x0, y0 != nullptr ? y0->data() : y0);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void LS2<N_CHANNELS>::reset(
|
|
const float * x0,
|
|
float * y0) {
|
|
bw_ls2_reset_coeffs(&coeffs);
|
|
bw_ls2_reset_state_multi(&coeffs, statesP, x0, y0, N_CHANNELS);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void LS2<N_CHANNELS>::reset(
|
|
std::array<float, N_CHANNELS> x0,
|
|
std::array<float, N_CHANNELS> * BW_RESTRICT y0) {
|
|
reset(x0.data(), y0 != nullptr ? y0->data() : nullptr);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void LS2<N_CHANNELS>::process(
|
|
const float * const * x,
|
|
float * const * y,
|
|
size_t nSamples) {
|
|
bw_ls2_process_multi(&coeffs, statesP, x, y, N_CHANNELS, nSamples);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void LS2<N_CHANNELS>::process(
|
|
std::array<const float *, N_CHANNELS> x,
|
|
std::array<float *, N_CHANNELS> y,
|
|
size_t nSamples) {
|
|
process(x.data(), y.data(), nSamples);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void LS2<N_CHANNELS>::setCutoff(
|
|
float value) {
|
|
bw_ls2_set_cutoff(&coeffs, value);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void LS2<N_CHANNELS>::setQ(
|
|
float value) {
|
|
bw_ls2_set_Q(&coeffs, value);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void LS2<N_CHANNELS>::setPrewarpAtCutoff(
|
|
bool value) {
|
|
bw_ls2_set_prewarp_at_cutoff(&coeffs, value);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void LS2<N_CHANNELS>::setPrewarpFreq(
|
|
float value) {
|
|
bw_ls2_set_prewarp_freq(&coeffs, value);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void LS2<N_CHANNELS>::setDcGainLin(
|
|
float value) {
|
|
bw_ls2_set_dc_gain_lin(&coeffs, value);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void LS2<N_CHANNELS>::setDcGainDB(
|
|
float value) {
|
|
bw_ls2_set_dc_gain_dB(&coeffs, value);
|
|
}
|
|
|
|
}
|
|
#endif
|
|
|
|
#endif
|