536 lines
16 KiB
C++
536 lines
16 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 {{{ 1.1.0 }}}
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* requires {{{ bw_common bw_math bw_rand }}}
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* description {{{
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* Generator of white noise with uniform distribution.
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*
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* This module has no internal state, rather its state is stored into a
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* `uint64_t` value to which the API user supplies a pointer (as in
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* [bw\_rand](bw_rand)).
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* }}}
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* changelog {{{
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* <ul>
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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_noise_gen_reset_coeffs()</code>,
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* <code>bw_noise_gen_update_coeffs_ctrl()</code>,
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* and <code>bw_noise_gen_update_coeffs_audio()</code>.</li>
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* <li><code>bw_noise_gen_process()</code> and
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* <code>bw_noise_gen_process_multi()</code> now use
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* <code>size_t</code> 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 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_noise_gen_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>0.2.0</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_NOISE_GEN_H
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#define BW_NOISE_GEN_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_noise_gen_coeffs
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* ```>>> */
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typedef struct bw_noise_gen_coeffs bw_noise_gen_coeffs;
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/*! <<<```
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* Coefficients and related.
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*
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* #### bw_noise_gen_init()
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* ```>>> */
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static inline void bw_noise_gen_init(
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bw_noise_gen_coeffs * BW_RESTRICT coeffs,
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uint64_t * BW_RESTRICT state);
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/*! <<<```
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* Initializes input parameter values and sets the `state` pointer to obtain
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* pseudo-random numbers in `coeffs`.
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*
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* #### bw_noise_gen_set_sample_rate()
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* ```>>> */
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static inline void bw_noise_gen_set_sample_rate(
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bw_noise_gen_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_noise_gen_reset_coeffs()
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* ```>>> */
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static inline void bw_noise_gen_reset_coeffs(
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bw_noise_gen_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_noise_gen_update_coeffs_ctrl()
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* ```>>> */
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static inline void bw_noise_gen_update_coeffs_ctrl(
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bw_noise_gen_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_noise_gen_update_coeffs_audio()
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* ```>>> */
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static inline void bw_noise_gen_update_coeffs_audio(
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bw_noise_gen_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_noise_gen_process1\*()
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* ```>>> */
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static inline float bw_noise_gen_process1(
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const bw_noise_gen_coeffs * BW_RESTRICT coeffs);
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static inline float bw_noise_gen_process1_scaling(
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const bw_noise_gen_coeffs * BW_RESTRICT coeffs);
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/*! <<<```
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* These functions generate and return one sample using `coeffs`, where:
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* * `bw_noise_gen_process1()` assumes that sample rate scaling is disabled;
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* * `bw_noise_gen_process1_scaling()` assumes that sample rate scaling is
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* enabled.
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*
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* Whether sample rate scaling is enabled or not is unchecked even for
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* debugging purposes.
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*
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* #### bw_noise_gen_process()
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* ```>>> */
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static inline void bw_noise_gen_process(
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bw_noise_gen_coeffs * BW_RESTRICT coeffs,
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float * BW_RESTRICT y,
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size_t n_samples);
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/*! <<<```
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* Generates and fills the first `n_samples` of the output buffer `y` using
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* `coeffs`.
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*
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* #### bw_noise_gen_process_multi()
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* ```>>> */
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static inline void bw_noise_gen_process_multi(
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bw_noise_gen_coeffs * BW_RESTRICT coeffs,
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float * BW_RESTRICT const * BW_RESTRICT 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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* Generates and fills the first `n_samples` of the `n_channels` output
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* buffers `y` using `coeffs`.
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*
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* #### bw_noise_gen_set_sample_rate_scaling()
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* ```>>> */
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static inline void bw_noise_gen_set_sample_rate_scaling(
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bw_noise_gen_coeffs * BW_RESTRICT coeffs,
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char value);
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/*! <<<```
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* Sets whether the output should be scaled (`value` non-`0`) or not (`0`)
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* according to the sample rate in `coeffs`.
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*
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* In order to maintain the same perceived loudness at different sample
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* rates, a white noise signal with uniform distribution should be
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* accordingly scaled. The 44100 Hz sample rate is used as a reference (that
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* is, the scaling factor at that sample rate is `1.f`).
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*
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* Default value: `0` (off).
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*
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* #### bw_noise_gen_get_scaling_k()
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* ```>>> */
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static inline float bw_noise_gen_get_scaling_k(
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const bw_noise_gen_coeffs * BW_RESTRICT coeffs);
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/*! <<<```
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* Returns the sample rate scaling factor that is applied or would be applied
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* if sample rate scaling were enabled, as stored in `coeffs`.
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*
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* `coeffs` must be at least inthe "sample-rate-set" state.
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*
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* #### bw_noise_gen_coeffs_is_valid()
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* ```>>> */
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static inline char bw_noise_gen_coeffs_is_valid(
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const bw_noise_gen_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_noise_gen_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_rand.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_noise_gen_coeffs_state {
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bw_noise_gen_coeffs_state_invalid,
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bw_noise_gen_coeffs_state_init,
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bw_noise_gen_coeffs_state_set_sample_rate,
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bw_noise_gen_coeffs_state_reset_coeffs
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};
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#endif
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struct bw_noise_gen_coeffs {
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#ifdef BW_DEBUG_DEEP
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uint32_t hash;
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enum bw_noise_gen_coeffs_state state;
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#endif
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// Coefficients
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float scaling_k;
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// Parameters
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uint64_t * BW_RESTRICT rand_state;
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char sample_rate_scaling;
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};
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static inline void bw_noise_gen_init(
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bw_noise_gen_coeffs * BW_RESTRICT coeffs,
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uint64_t * BW_RESTRICT state) {
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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT(state != BW_NULL);
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coeffs->rand_state = state;
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coeffs->sample_rate_scaling = 0;
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#ifdef BW_DEBUG_DEEP
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coeffs->hash = bw_hash_sdbm("bw_noise_gen_coeffs");
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coeffs->state = bw_noise_gen_coeffs_state_init;
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#endif
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BW_ASSERT_DEEP(bw_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state == bw_noise_gen_coeffs_state_init);
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}
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static inline void bw_noise_gen_set_sample_rate(
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bw_noise_gen_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_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_noise_gen_coeffs_state_init);
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BW_ASSERT(bw_is_finite(sample_rate) && sample_rate > 0.f);
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coeffs->scaling_k = 0.004761904761904762f * bw_sqrtf(sample_rate);
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#ifdef BW_DEBUG_DEEP
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coeffs->state = bw_noise_gen_coeffs_state_set_sample_rate;
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#endif
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BW_ASSERT_DEEP(bw_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state == bw_noise_gen_coeffs_state_set_sample_rate);
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}
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static inline void bw_noise_gen_reset_coeffs(
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bw_noise_gen_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT_DEEP(bw_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_noise_gen_coeffs_state_set_sample_rate);
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(void)coeffs;
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#ifdef BW_DEBUG_DEEP
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coeffs->state = bw_noise_gen_coeffs_state_reset_coeffs;
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#endif
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BW_ASSERT_DEEP(bw_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state == bw_noise_gen_coeffs_state_reset_coeffs);
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}
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static inline void bw_noise_gen_update_coeffs_ctrl(
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bw_noise_gen_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT_DEEP(bw_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_noise_gen_coeffs_state_reset_coeffs);
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(void)coeffs;
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}
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static inline void bw_noise_gen_update_coeffs_audio(
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bw_noise_gen_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT_DEEP(bw_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_noise_gen_coeffs_state_reset_coeffs);
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(void)coeffs;
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}
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static inline float bw_noise_gen_process1(
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const bw_noise_gen_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT_DEEP(bw_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_noise_gen_coeffs_state_reset_coeffs);
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const float y = bw_randf(coeffs->rand_state);
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BW_ASSERT_DEEP(bw_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_noise_gen_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 float bw_noise_gen_process1_scaling(
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const bw_noise_gen_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT_DEEP(bw_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_noise_gen_coeffs_state_reset_coeffs);
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const float y = coeffs->scaling_k * bw_randf(coeffs->rand_state);
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BW_ASSERT_DEEP(bw_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_noise_gen_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_noise_gen_process(
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bw_noise_gen_coeffs * BW_RESTRICT coeffs,
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float * BW_RESTRICT 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_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_noise_gen_coeffs_state_reset_coeffs);
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BW_ASSERT(y != BW_NULL);
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if (coeffs->sample_rate_scaling)
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for (size_t i = 0; i < n_samples; i++)
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y[i] = bw_noise_gen_process1(coeffs);
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else
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for (size_t i = 0; i < n_samples; i++)
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y[i] = bw_noise_gen_process1_scaling(coeffs);
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BW_ASSERT_DEEP(bw_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_noise_gen_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_noise_gen_process_multi(
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bw_noise_gen_coeffs * BW_RESTRICT coeffs,
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float * BW_RESTRICT const * BW_RESTRICT 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_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_noise_gen_coeffs_state_reset_coeffs);
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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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#endif
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for (size_t i = 0; i < n_channels; i++)
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bw_noise_gen_process(coeffs, y[i], n_samples);
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BW_ASSERT_DEEP(bw_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_noise_gen_coeffs_state_reset_coeffs);
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}
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static inline void bw_noise_gen_set_sample_rate_scaling(
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bw_noise_gen_coeffs * BW_RESTRICT coeffs,
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char value) {
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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT_DEEP(bw_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_noise_gen_coeffs_state_init);
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coeffs->sample_rate_scaling = value;
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BW_ASSERT_DEEP(bw_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_noise_gen_coeffs_state_init);
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}
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static inline float bw_noise_gen_get_scaling_k(
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const bw_noise_gen_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != BW_NULL);
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BW_ASSERT_DEEP(bw_noise_gen_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_noise_gen_coeffs_state_set_sample_rate);
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return coeffs->scaling_k;
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}
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static inline char bw_noise_gen_coeffs_is_valid(
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const bw_noise_gen_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != BW_NULL);
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#ifdef BW_DEBUG_DEEP
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if (coeffs->hash != bw_hash_sdbm("bw_noise_gen_coeffs"))
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return 0;
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if (coeffs->state < bw_noise_gen_coeffs_state_init || coeffs->state > bw_noise_gen_coeffs_state_reset_coeffs)
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return 0;
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#endif
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if (coeffs->rand_state == BW_NULL)
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return 0;
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#ifdef BW_DEBUG_DEEP
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if (coeffs->state >= bw_noise_gen_coeffs_state_set_sample_rate && coeffs->scaling_k <= 0.f)
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return 0;
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#endif
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return 1;
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}
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#ifdef __cplusplus
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}
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#ifndef BW_CXX_NO_ARRAY
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# include <array>
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#endif
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namespace Brickworks {
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/*** Public C++ API ***/
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/*! api_cpp {{{
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* ##### Brickworks::NoiseGen
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* ```>>> */
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template<size_t N_CHANNELS>
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class NoiseGen {
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public:
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NoiseGen(
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uint64_t * BW_RESTRICT state);
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void setSampleRate(
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float sampleRate);
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void reset();
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void process(
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float * BW_RESTRICT const * BW_RESTRICT y,
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size_t nSamples);
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#ifndef BW_CXX_NO_ARRAY
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void process(
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std::array<float * BW_RESTRICT, N_CHANNELS> y,
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size_t nSamples);
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#endif
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void setSampleRateScaling(
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bool value);
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float getScalingK();
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/*! <<<...
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* }
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* ```
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* }}} */
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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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private:
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bw_noise_gen_coeffs coeffs;
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};
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template<size_t N_CHANNELS>
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inline NoiseGen<N_CHANNELS>::NoiseGen(
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uint64_t * BW_RESTRICT state) {
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bw_noise_gen_init(&coeffs, state);
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}
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template<size_t N_CHANNELS>
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inline void NoiseGen<N_CHANNELS>::setSampleRate(
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float sampleRate) {
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bw_noise_gen_set_sample_rate(&coeffs, sampleRate);
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}
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template<size_t N_CHANNELS>
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inline void NoiseGen<N_CHANNELS>::reset() {
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bw_noise_gen_reset_coeffs(&coeffs);
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}
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template<size_t N_CHANNELS>
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inline void NoiseGen<N_CHANNELS>::process(
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float *BW_RESTRICT const *BW_RESTRICT y,
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size_t nSamples) {
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bw_noise_gen_process_multi(&coeffs, y, N_CHANNELS, nSamples);
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}
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#ifndef BW_CXX_NO_ARRAY
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template<size_t N_CHANNELS>
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inline void NoiseGen<N_CHANNELS>::process(
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std::array<float * BW_RESTRICT, N_CHANNELS> y,
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size_t nSamples) {
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process(y.data(), nSamples);
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}
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#endif
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template<size_t N_CHANNELS>
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inline void NoiseGen<N_CHANNELS>::setSampleRateScaling(
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bool value) {
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bw_noise_gen_set_sample_rate_scaling(&coeffs, value);
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}
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template<size_t N_CHANNELS>
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inline float NoiseGen<N_CHANNELS>::getScalingK() {
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return bw_noise_gen_get_scaling_k(&coeffs);
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}
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}
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#endif
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#endif
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