137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
/*
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* Brickworks
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*
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* Copyright (C) 2022 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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*
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* File author: Stefano D'Angelo
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*/
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/*!
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* module_type {{{ dsp }}}
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* version {{{ 0.2.0 }}}
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* requires {{{ bw_config bw_common bw_inline_slew_lim bw_math }}}
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* description {{{
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* Volume control for an arbitrary number of channels.
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* }}}
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* changelog {{{
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* <ul>
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* <li>Version <strong>0.2.0</strong>:
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* <ul>
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* <li>Refactored API to avoid dynamic memory allocation.</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_VOL_H
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#define _BW_VOL_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_vol
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* ```>>> */
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typedef struct _bw_vol bw_vol;
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/*! <<<```
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* Instance object.
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* >>> */
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/*! ...
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* #### bw_vol_init()
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* ```>>> */
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void bw_vol_init(bw_vol *instance);
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/*! <<<```
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* Initializes the `instance` object.
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* >>> */
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/*! ...
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* #### bw_vol_set_sample_rate()
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* ```>>> */
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void bw_vol_set_sample_rate(bw_vol *instance, float sample_rate);
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/*! <<<```
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* Sets the `sample_rate` (Hz) value for the given `instance`.
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* >>> */
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/*! ...
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* #### bw_vol_reset()
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* ```>>> */
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void bw_vol_reset(bw_vol *instance);
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/*! <<<```
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* Resets the given `instance` to its initial state.
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* >>> */
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/*! ...
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* #### bw_vol_process()
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* ```>>> */
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void bw_vol_process(bw_vol *instance, const float **x, float **y, int n_channels, int n_samples);
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/*! <<<```
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* Lets the given `instance` process `n_samples` samples from each of the
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* `n_channels` input buffers and fills the corresponding `n_samples` samples
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* in each of the `n_channels` output buffers.
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*
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* `x` is an array of `n_channels` input buffers and similarly `y` is an
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* array of `n_channels` output buffers.
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* >>> */
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/*! ...
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* #### bw_vol_set_volume()
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* ```>>> */
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void bw_vol_set_volume(bw_vol *instance, float value);
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/*! <<<```
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* Sets the volume parameter to the given `value` (range [`0.f`, `1.f`]) for
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* the given `instance`.
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*
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* This parameter is not linearly mapped, but the range extremes correspond
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* to silence (gain = `0.f`) and bypass (gain = `1.f`).
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*
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* Default value: `1.f`.
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* }}} */
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/* WARNING: this definition is not part of the public API. Please, do not use
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* it. */
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#define _BW_VOL_BUFFER_SIZE 32
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/* WARNING: the internal definition of this struct is not part of the public
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* API. Its content may change at any time in future versions. Please, do not
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* access its members directly. */
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struct _bw_vol {
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// Coefficients
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float max_var;
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// Parameters
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float volume;
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float volume_cur;
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// State
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char first_run;
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// Buffers
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float buf[_BW_VOL_BUFFER_SIZE];
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};
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#ifdef __cplusplus
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}
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#endif
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#endif
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