645 lines
18 KiB
C++
645 lines
18 KiB
C++
/*
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* Brickworks
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*
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* Copyright (C) 2022-2024 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 {{{ 1.1.1 }}}
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* requires {{{ bw_common bw_math bw_one_pole }}}
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* description {{{
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* Gain.
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* }}}
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* changelog {{{
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* <ul>
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* <li>Version <strong>1.1.1</strong>:
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* <ul>
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* <li>Added debugging check in <code>bw_gain_process_multi()</code> to
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* ensure that buffers used for both input and output appear at the
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* same channel indices.</li>
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* </ul>
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* </li>
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* <li>Version <strong>1.1.0</strong>:
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* <ul>
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* <li>Now using <code>BW_NULL</code> and
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* <code>BW_CXX_NO_ARRAY</code>.</li>
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* </ul>
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* </li>
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* <li>Version <strong>1.0.0</strong>:
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* <ul>
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* <li>Added <code>bw_gain_get_gain_lin()</code>.</li>
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* <li>Renamed <code>bw_gain_get_gain()</code> as
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* <code>bw_gain_get_gain_cur()</code>.</li>
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* <li>Simplified implementation to use less memory.</li>
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* <li><code>bw_gain_process()</code> and
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* <code>bw_gain_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> 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 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>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_gain_process_multi()</code>.</li>
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* <li>Added <code>bw_gain_get_gain()</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>Renamed as bw_gain.</li>
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* <li>Added new smooth_tau parameter.</li>
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* <li>Changed gain parameter API to express values in linear gain
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* and dB.</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>0.2.0</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_GAIN_H
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#define BW_GAIN_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_gain_coeffs
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* ```>>> */
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typedef struct bw_gain_coeffs bw_gain_coeffs;
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/*! <<<```
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* Coefficients and related.
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*
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* #### bw_gain_init()
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* ```>>> */
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static inline void bw_gain_init(
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bw_gain_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_gain_set_sample_rate()
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* ```>>> */
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static inline void bw_gain_set_sample_rate(
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bw_gain_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_gain_reset_coeffs()
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* ```>>> */
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static inline void bw_gain_reset_coeffs(
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bw_gain_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_gain_update_coeffs_ctrl()
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* ```>>> */
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static inline void bw_gain_update_coeffs_ctrl(
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bw_gain_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_gain_update_coeffs_audio()
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* ```>>> */
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static inline void bw_gain_update_coeffs_audio(
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bw_gain_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_gain_process1()
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* ```>>> */
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static inline float bw_gain_process1(
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const bw_gain_coeffs * BW_RESTRICT coeffs,
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float x);
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/*! <<<```
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* Processes one input sample `x` using `coeffs` and returns the
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* corresponding output sample.
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*
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* #### bw_gain_process()
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* ```>>> */
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static inline void bw_gain_process(
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bw_gain_coeffs * BW_RESTRICT coeffs,
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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
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* `coeffs` (control and audio rate).
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*
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* #### bw_gain_process_multi()
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* ```>>> */
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static inline void bw_gain_process_multi(
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bw_gain_coeffs * BW_RESTRICT coeffs,
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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 the common `coeffs` (control and audio rate).
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*
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* #### bw_gain_set_gain_lin()
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* ```>>> */
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static inline void bw_gain_set_gain_lin(
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bw_gain_coeffs * BW_RESTRICT coeffs,
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float value);
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/*! <<<```
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* Sets the gain parameter to the given `value` (linear gain) in `coeffs`.
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*
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* `value` must be finite.
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*
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* Default value: `1.f`.
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*
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* #### bw_gain_set_gain_dB()
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* ```>>> */
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static inline void bw_gain_set_gain_dB(
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bw_gain_coeffs * BW_RESTRICT coeffs,
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float value);
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/*! <<<```
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* Sets the gain parameter to the given `value` (dB) in `coeffs`.
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*
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* `value` must be less than or equal to `770.630f`.
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*
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* Default value: `0.f`.
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*
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* #### bw_gain_set_smooth_tau()
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* ```>>> */
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static inline void bw_gain_set_smooth_tau(
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bw_gain_coeffs * BW_RESTRICT coeffs,
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float value);
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/*! <<<```
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* Sets the smoothing time constant `value` (s) in `coeffs`.
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*
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* `value` must be non-negative.
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*
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* Default value: `0.05f`.
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*
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* #### bw_gain_get_gain_lin()
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* ```>>> */
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static inline float bw_gain_get_gain_lin(
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const bw_gain_coeffs * BW_RESTRICT coeffs);
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/*! <<<```
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* Returns the current gain parameter value (linear gain) in `coeffs`.
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*
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* #### bw_gain_get_gain_cur()
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* ```>>> */
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static inline float bw_gain_get_gain_cur(
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const bw_gain_coeffs * BW_RESTRICT coeffs);
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/*! <<<```
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* Returns the actual current gain coefficient (linear gain) in `coeffs`.
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*
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* `coeffs` must be at least in the "reset" state.
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*
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* #### bw_gain_coeffs_is_valid()
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* ```>>> */
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static inline char bw_gain_coeffs_is_valid(
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const bw_gain_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_gain_coeffs`.
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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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#ifdef BW_DEBUG_DEEP
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enum bw_gain_coeffs_state {
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bw_gain_coeffs_state_invalid,
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bw_gain_coeffs_state_init,
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bw_gain_coeffs_state_set_sample_rate,
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bw_gain_coeffs_state_reset_coeffs
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};
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#endif
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struct bw_gain_coeffs {
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#ifdef BW_DEBUG_DEEP
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uint32_t hash;
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enum bw_gain_coeffs_state state;
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#endif
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// Sub-components
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bw_one_pole_coeffs smooth_coeffs;
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bw_one_pole_state smooth_state;
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// Parameters
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float gain;
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};
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static inline void bw_gain_init(
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bw_gain_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != BW_NULL);
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bw_one_pole_init(&coeffs->smooth_coeffs);
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bw_one_pole_set_tau(&coeffs->smooth_coeffs, 0.05f);
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coeffs->gain = 1.f;
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#ifdef BW_DEBUG_DEEP
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coeffs->hash = bw_hash_sdbm("bw_gain_coeffs");
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coeffs->state = bw_gain_coeffs_state_init;
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#endif
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state == bw_gain_coeffs_state_init);
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}
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static inline void bw_gain_set_sample_rate(
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bw_gain_coeffs * BW_RESTRICT coeffs,
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float sample_rate) {
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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_init);
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BW_ASSERT(bw_is_finite(sample_rate) && sample_rate > 0.f);
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bw_one_pole_set_sample_rate(&coeffs->smooth_coeffs, sample_rate);
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#ifdef BW_DEBUG_DEEP
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coeffs->state = bw_gain_coeffs_state_set_sample_rate;
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#endif
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state == bw_gain_coeffs_state_set_sample_rate);
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}
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static inline void bw_gain_reset_coeffs(
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bw_gain_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_set_sample_rate);
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bw_one_pole_reset_coeffs(&coeffs->smooth_coeffs);
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bw_one_pole_reset_state(&coeffs->smooth_coeffs, &coeffs->smooth_state, coeffs->gain);
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#ifdef BW_DEBUG_DEEP
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coeffs->state = bw_gain_coeffs_state_reset_coeffs;
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#endif
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state == bw_gain_coeffs_state_reset_coeffs);
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}
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static inline void bw_gain_update_coeffs_ctrl(
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bw_gain_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_reset_coeffs);
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bw_one_pole_update_coeffs_ctrl(&coeffs->smooth_coeffs);
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_reset_coeffs);
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}
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static inline void bw_gain_update_coeffs_audio(
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bw_gain_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_reset_coeffs);
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bw_one_pole_update_coeffs_audio(&coeffs->smooth_coeffs);
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bw_one_pole_process1(&coeffs->smooth_coeffs, &coeffs->smooth_state, coeffs->gain);
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_reset_coeffs);
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}
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static inline float bw_gain_process1(
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const bw_gain_coeffs * BW_RESTRICT coeffs,
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float x) {
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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_reset_coeffs);
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BW_ASSERT(bw_is_finite(x));
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const float y = bw_one_pole_get_y_z1(&coeffs->smooth_state) * x;
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_reset_coeffs);
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BW_ASSERT(bw_is_finite(y));
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return y;
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}
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static inline void bw_gain_process(
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bw_gain_coeffs * BW_RESTRICT coeffs,
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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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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_reset_coeffs);
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BW_ASSERT(x != BW_NULL);
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BW_ASSERT_DEEP(bw_has_only_finite(x, n_samples));
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BW_ASSERT(y != BW_NULL);
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bw_gain_update_coeffs_ctrl(coeffs);
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for (size_t i = 0; i < n_samples; i++) {
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bw_gain_update_coeffs_audio(coeffs);
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y[i] = bw_gain_process1(coeffs, x[i]);
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}
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_reset_coeffs);
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BW_ASSERT_DEEP(bw_has_only_finite(y, n_samples));
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}
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static inline void bw_gain_process_multi(
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bw_gain_coeffs * BW_RESTRICT coeffs,
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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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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_reset_coeffs);
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BW_ASSERT(x != BW_NULL);
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BW_ASSERT(y != BW_NULL);
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#ifndef BW_NO_DEBUG
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for (size_t i = 0; i < n_channels; i++)
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for (size_t j = i + 1; j < n_channels; j++)
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BW_ASSERT(y[i] != y[j]);
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for (size_t i = 0; i < n_channels; i++)
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for (size_t j = 0; j < n_channels; j++)
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BW_ASSERT(i == j || x[i] != y[j]);
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#endif
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bw_gain_update_coeffs_ctrl(coeffs);
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for (size_t i = 0; i < n_samples; i++) {
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bw_gain_update_coeffs_audio(coeffs);
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for (size_t j = 0; j < n_channels; j++)
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y[j][i] = bw_gain_process1(coeffs, x[j][i]);
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}
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_reset_coeffs);
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}
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static inline void bw_gain_set_gain_lin(
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bw_gain_coeffs * BW_RESTRICT coeffs,
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float value) {
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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_init);
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BW_ASSERT(bw_is_finite(value));
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coeffs->gain = value;
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BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_init);
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}
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static inline void bw_gain_set_gain_dB(
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bw_gain_coeffs * BW_RESTRICT coeffs,
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float value) {
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BW_ASSERT(coeffs != BW_NULL);
|
|
BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_init);
|
|
BW_ASSERT(!bw_is_nan(value));
|
|
BW_ASSERT(value <= 770.630f);
|
|
|
|
coeffs->gain = bw_dB2linf(value);
|
|
|
|
BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_init);
|
|
}
|
|
|
|
static inline void bw_gain_set_smooth_tau(
|
|
bw_gain_coeffs * BW_RESTRICT coeffs,
|
|
float value) {
|
|
BW_ASSERT(coeffs != BW_NULL);
|
|
BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_init);
|
|
BW_ASSERT(!bw_is_nan(value));
|
|
BW_ASSERT(value >= 0.f);
|
|
|
|
bw_one_pole_set_tau(&coeffs->smooth_coeffs, value);
|
|
|
|
BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_init);
|
|
}
|
|
|
|
static inline float bw_gain_get_gain_lin(
|
|
const bw_gain_coeffs * BW_RESTRICT coeffs) {
|
|
BW_ASSERT(coeffs != BW_NULL);
|
|
BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
|
|
|
|
return coeffs->gain;
|
|
}
|
|
|
|
static inline float bw_gain_get_gain_cur(
|
|
const bw_gain_coeffs * BW_RESTRICT coeffs) {
|
|
BW_ASSERT(coeffs != BW_NULL);
|
|
BW_ASSERT_DEEP(bw_gain_coeffs_is_valid(coeffs));
|
|
BW_ASSERT_DEEP(coeffs->state >= bw_gain_coeffs_state_reset_coeffs);
|
|
|
|
return bw_one_pole_get_y_z1(&coeffs->smooth_state);
|
|
}
|
|
|
|
static inline char bw_gain_coeffs_is_valid(
|
|
const bw_gain_coeffs * BW_RESTRICT coeffs) {
|
|
BW_ASSERT(coeffs != BW_NULL);
|
|
|
|
#ifdef BW_DEBUG_DEEP
|
|
if (coeffs->hash != bw_hash_sdbm("bw_gain_coeffs"))
|
|
return 0;
|
|
if (coeffs->state < bw_gain_coeffs_state_init || coeffs->state > bw_gain_coeffs_state_reset_coeffs)
|
|
return 0;
|
|
#endif
|
|
|
|
if (!bw_is_finite(coeffs->gain))
|
|
return 0;
|
|
|
|
if (!bw_one_pole_coeffs_is_valid(&coeffs->smooth_coeffs))
|
|
return 0;
|
|
|
|
#ifdef BW_DEBUG_DEEP
|
|
if (coeffs->state >= bw_gain_coeffs_state_reset_coeffs && !bw_one_pole_state_is_valid(&coeffs->smooth_coeffs, &coeffs->smooth_state))
|
|
return 0;
|
|
#endif
|
|
|
|
return 1;
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
|
|
#ifndef BW_CXX_NO_ARRAY
|
|
# include <array>
|
|
#endif
|
|
|
|
namespace Brickworks {
|
|
|
|
/*** Public C++ API ***/
|
|
|
|
/*! api_cpp {{{
|
|
* ##### Brickworks::Gain
|
|
* ```>>> */
|
|
template<size_t N_CHANNELS>
|
|
class Gain {
|
|
public:
|
|
Gain();
|
|
|
|
void setSampleRate(
|
|
float sampleRate);
|
|
|
|
void reset();
|
|
|
|
void process(
|
|
const float * const * x,
|
|
float * const * y,
|
|
size_t nSamples);
|
|
|
|
#ifndef BW_CXX_NO_ARRAY
|
|
void process(
|
|
std::array<const float *, N_CHANNELS> x,
|
|
std::array<float *, N_CHANNELS> y,
|
|
size_t nSamples);
|
|
#endif
|
|
|
|
void setGainLin(
|
|
float value);
|
|
|
|
void setGainDB(
|
|
float value);
|
|
|
|
void setSmoothTau(
|
|
float value);
|
|
|
|
float getGainLin();
|
|
|
|
float getGainCur();
|
|
/*! <<<...
|
|
* }
|
|
* ```
|
|
* }}} */
|
|
|
|
/*** 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_gain_coeffs coeffs;
|
|
};
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline Gain<N_CHANNELS>::Gain() {
|
|
bw_gain_init(&coeffs);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void Gain<N_CHANNELS>::setSampleRate(
|
|
float sampleRate) {
|
|
bw_gain_set_sample_rate(&coeffs, sampleRate);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void Gain<N_CHANNELS>::reset() {
|
|
bw_gain_reset_coeffs(&coeffs);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void Gain<N_CHANNELS>::process(
|
|
const float * const * x,
|
|
float * const * y,
|
|
size_t nSamples) {
|
|
bw_gain_process_multi(&coeffs, x, y, N_CHANNELS, nSamples);
|
|
}
|
|
|
|
#ifndef BW_CXX_NO_ARRAY
|
|
template<size_t N_CHANNELS>
|
|
inline void Gain<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);
|
|
}
|
|
#endif
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void Gain<N_CHANNELS>::setGainLin(
|
|
float value) {
|
|
bw_gain_set_gain_lin(&coeffs, value);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void Gain<N_CHANNELS>::setGainDB(
|
|
float value) {
|
|
bw_gain_set_gain_dB(&coeffs, value);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void Gain<N_CHANNELS>::setSmoothTau(
|
|
float value) {
|
|
bw_gain_set_smooth_tau(&coeffs, value);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline float Gain<N_CHANNELS>::getGainLin() {
|
|
return bw_gain_get_gain_lin(&coeffs);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline float Gain<N_CHANNELS>::getGainCur() {
|
|
return bw_gain_get_gain_cur(&coeffs);
|
|
}
|
|
|
|
}
|
|
#endif
|
|
|
|
#endif
|