545 lines
16 KiB
C++
545 lines
16 KiB
C++
/*
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* Brickworks
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*
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* Copyright (C) 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_one_pole }}}
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* description {{{
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* Stereo balance.
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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><code>bw_balance_process()</code> and
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* <code>bw_balance_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> 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_balance_process_multi()</code>.</li>
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* <li><code>bw_balance_process()</code> does not accept
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* <code>NULL</code> buffers anymore.</li>
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* <li>Fixed documentation of <code>bw_balance_process1()</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>0.3.0</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_BALANCE_H
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#define BW_BALANCE_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_balance_coeffs
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* ```>>> */
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typedef struct bw_balance_coeffs bw_balance_coeffs;
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/*! <<<```
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* Coefficients and related.
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*
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* #### bw_balance_init()
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* ```>>> */
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static inline void bw_balance_init(
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bw_balance_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_balance_set_sample_rate()
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* ```>>> */
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static inline void bw_balance_set_sample_rate(
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bw_balance_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_balance_reset_coeffs()
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* ```>>> */
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static inline void bw_balance_reset_coeffs(
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bw_balance_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_balance_update_coeffs_ctrl()
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* ```>>> */
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static inline void bw_balance_update_coeffs_ctrl(
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bw_balance_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_balance_update_coeffs_audio()
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* ```>>> */
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static inline void bw_balance_update_coeffs_audio(
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bw_balance_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_balance_process1()
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* ```>>> */
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static inline void bw_balance_process1(
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const bw_balance_coeffs * BW_RESTRICT coeffs,
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float x_l,
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float x_r,
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float * BW_RESTRICT y_l,
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float * BW_RESTRICT y_r);
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/*! <<<```
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* Processes one set of input samples `x_l` (left) and `x_r` (right) using
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* `coeffs`. The left and right output samples are put into `y_l` (left) and
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* `y_r` (right) respectively.
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*
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* #### bw_balance_process()
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* ```>>> */
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static inline void bw_balance_process(
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bw_balance_coeffs * BW_RESTRICT coeffs,
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const float * x_l,
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const float * x_r,
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float * y_l,
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float * y_r,
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size_t n_samples);
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/*! <<<```
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* Processes the first `n_samples` of the input buffers `x_l` (left) and
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* `x_r` (right) and fills the first `n_samples` of the output buffers `y_l`
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* (left) and `y_r` (right), while using and updating `coeffs` (control and
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* audio rate).
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*
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* #### bw_balance_process_multi()
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* ```>>> */
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static inline void bw_balance_process_multi(
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bw_balance_coeffs * BW_RESTRICT coeffs,
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const float * const * x_l,
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const float * const * x_r,
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float * const * y_l,
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float * const * y_r,
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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_l`
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* (left) and `x_r` (right) and fills the first `n_samples` of the
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* `n_channels` output buffers `y_l` (left) and `y_r` (right), while using
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* and updating the common `coeffs` (control and audio rate).
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*
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* #### bw_balance_set_balance()
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* ```>>> */
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static inline void bw_balance_set_balance(
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bw_balance_coeffs * BW_RESTRICT coeffs,
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float value);
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/*! <<<```
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* Sets the balance `value`, where `-1.f` corresponds to hard left balance,
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* `0.f` to center balance, and `1.f` to hard right balance.
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*
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* Valid range: [`-1.f` (hard left balance), `1.f` (hard right balance)].
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*
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* Default value: `0.f`.
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*
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* #### bw_balance_coeffs_is_valid()
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* ```>>> */
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static inline char bw_balance_coeffs_is_valid(
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const bw_balance_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_balance_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_gain.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_balance_coeffs_state {
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bw_balance_coeffs_state_invalid,
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bw_balance_coeffs_state_init,
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bw_balance_coeffs_state_set_sample_rate,
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bw_balance_coeffs_state_reset_coeffs
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};
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#endif
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struct bw_balance_coeffs {
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#ifdef BW_DEBUG_DEEP
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uint32_t hash;
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enum bw_balance_coeffs_state state;
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#endif
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// Sub-components
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bw_gain_coeffs l_coeffs;
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bw_gain_coeffs r_coeffs;
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// Parameters
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float balance;
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float balance_prev;
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};
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static inline void bw_balance_init(
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bw_balance_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != NULL);
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bw_gain_init(&coeffs->l_coeffs);
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bw_gain_init(&coeffs->r_coeffs);
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coeffs->balance = 0.f;
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#ifdef BW_DEBUG_DEEP
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coeffs->hash = bw_hash_sdbm("bw_balance_coeffs");
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coeffs->state = bw_balance_coeffs_state_init;
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#endif
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state == bw_balance_coeffs_state_init);
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}
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static inline void bw_balance_set_sample_rate(
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bw_balance_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_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_balance_coeffs_state_init);
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BW_ASSERT(bw_is_finite(sample_rate) && sample_rate > 0.f);
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bw_gain_set_sample_rate(&coeffs->l_coeffs, sample_rate);
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bw_gain_set_sample_rate(&coeffs->r_coeffs, sample_rate);
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#ifdef BW_DEBUG_DEEP
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coeffs->state = bw_balance_coeffs_state_set_sample_rate;
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#endif
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state == bw_balance_coeffs_state_set_sample_rate);
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}
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static inline void bw_balance_do_update_coeffs(
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bw_balance_coeffs * BW_RESTRICT coeffs,
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char force) {
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if (force || coeffs->balance != coeffs->balance_prev) {
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bw_gain_set_gain_lin(&coeffs->l_coeffs, bw_minf(1.f - coeffs->balance, 1.f));
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bw_gain_set_gain_lin(&coeffs->r_coeffs, bw_minf(1.f + coeffs->balance, 1.f));
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coeffs->balance_prev = coeffs->balance;
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}
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}
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static inline void bw_balance_reset_coeffs(
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bw_balance_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != NULL);
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_balance_coeffs_state_set_sample_rate);
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bw_balance_do_update_coeffs(coeffs, 1);
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bw_gain_reset_coeffs(&coeffs->l_coeffs);
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bw_gain_reset_coeffs(&coeffs->r_coeffs);
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#ifdef BW_DEBUG_DEEP
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coeffs->state = bw_balance_coeffs_state_reset_coeffs;
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#endif
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state == bw_balance_coeffs_state_reset_coeffs);
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}
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static inline void bw_balance_update_coeffs_ctrl(
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bw_balance_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != NULL);
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_balance_coeffs_state_reset_coeffs);
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bw_balance_do_update_coeffs(coeffs, 0);
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bw_gain_update_coeffs_ctrl(&coeffs->l_coeffs);
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bw_gain_update_coeffs_ctrl(&coeffs->r_coeffs);
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_balance_coeffs_state_reset_coeffs);
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}
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static inline void bw_balance_update_coeffs_audio(
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bw_balance_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != NULL);
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_balance_coeffs_state_reset_coeffs);
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bw_gain_update_coeffs_audio(&coeffs->l_coeffs);
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bw_gain_update_coeffs_audio(&coeffs->r_coeffs);
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_balance_coeffs_state_reset_coeffs);
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}
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static inline void bw_balance_process1(
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const bw_balance_coeffs * BW_RESTRICT coeffs,
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float x_l,
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float x_r,
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float * BW_RESTRICT y_l,
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float * BW_RESTRICT y_r) {
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BW_ASSERT(coeffs != NULL);
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_balance_coeffs_state_reset_coeffs);
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BW_ASSERT(bw_is_finite(x_l));
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BW_ASSERT(bw_is_finite(x_r));
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BW_ASSERT(y_l != y_r);
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*y_l = bw_gain_process1(&coeffs->l_coeffs, x_l);
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*y_r = bw_gain_process1(&coeffs->r_coeffs, x_r);
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_balance_coeffs_state_reset_coeffs);
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BW_ASSERT(bw_is_finite(*y_l));
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BW_ASSERT(bw_is_finite(*y_r));
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}
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static inline void bw_balance_process(
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bw_balance_coeffs * BW_RESTRICT coeffs,
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const float * x_l,
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const float * x_r,
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float * y_l,
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float * y_r,
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size_t n_samples){
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BW_ASSERT(coeffs != NULL);
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_balance_coeffs_state_reset_coeffs);
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BW_ASSERT(x_l != NULL);
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BW_ASSERT_DEEP(bw_has_only_finite(x_l, n_samples));
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BW_ASSERT(x_r != NULL);
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BW_ASSERT_DEEP(bw_has_only_finite(x_r, n_samples));
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BW_ASSERT(y_l != NULL);
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BW_ASSERT(y_r != NULL);
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BW_ASSERT(y_l != y_r);
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bw_balance_update_coeffs_ctrl(coeffs);
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for (size_t i = 0; i < n_samples; i++) {
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bw_balance_update_coeffs_audio(coeffs);
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bw_balance_process1(coeffs, x_l[i], x_r[i], y_l + i, y_r + i);
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}
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_balance_coeffs_state_reset_coeffs);
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BW_ASSERT_DEEP(bw_has_only_finite(y_l, n_samples));
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BW_ASSERT_DEEP(bw_has_only_finite(y_r, n_samples));
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}
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static inline void bw_balance_process_multi(
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bw_balance_coeffs * BW_RESTRICT coeffs,
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const float * const * x_l,
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const float * const * x_r,
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float * const * y_l,
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float * const * y_r,
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size_t n_channels,
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size_t n_samples) {
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BW_ASSERT(coeffs != NULL);
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_balance_coeffs_state_reset_coeffs);
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BW_ASSERT(x_l != NULL);
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BW_ASSERT(x_r != NULL);
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BW_ASSERT(y_l != NULL);
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BW_ASSERT(y_r != NULL);
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BW_ASSERT(y_l != y_r);
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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_l[i] != y_l[j]);
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BW_ASSERT(y_r[i] != y_r[j]);
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}
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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(y_l[i] != y_r[j]);
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#endif
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bw_balance_update_coeffs_ctrl(coeffs);
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for (size_t i = 0; i < n_samples; i++) {
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bw_balance_update_coeffs_audio(coeffs);
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for (size_t j = 0; j < n_channels; j++)
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bw_balance_process1(coeffs, x_l[j][i], x_r[j][i], y_l[j] + i, y_r[j] + i);
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}
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_balance_coeffs_state_reset_coeffs);
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}
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static inline void bw_balance_set_balance(
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bw_balance_coeffs * BW_RESTRICT coeffs,
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float value) {
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BW_ASSERT(coeffs != NULL);
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_balance_coeffs_state_init);
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BW_ASSERT(bw_is_finite(value));
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BW_ASSERT(value >= -1.f && value <= 1.f);
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coeffs->balance = value;
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BW_ASSERT_DEEP(bw_balance_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(coeffs->state >= bw_balance_coeffs_state_init);
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}
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static inline char bw_balance_coeffs_is_valid(
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const bw_balance_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != NULL);
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#ifdef BW_DEBUG_DEEP
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if (coeffs->hash != bw_hash_sdbm("bw_balance_coeffs"))
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return 0;
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if (coeffs->state < bw_balance_coeffs_state_init || coeffs->state > bw_balance_coeffs_state_reset_coeffs)
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return 0;
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#endif
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if (!bw_is_finite(coeffs->balance) || coeffs->balance < -1.f || coeffs->balance > 1.f)
|
|
return 0;
|
|
|
|
#ifdef BW_DEBUG_DEEP
|
|
if (coeffs->state >= bw_balance_coeffs_state_reset_coeffs) {
|
|
if (!bw_is_finite(coeffs->balance_prev) || coeffs->balance_prev < -1.f || coeffs->balance_prev > 1.f)
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
return bw_gain_coeffs_is_valid(&coeffs->l_coeffs) && bw_gain_coeffs_is_valid(&coeffs->r_coeffs);
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
|
|
#include <array>
|
|
|
|
namespace Brickworks {
|
|
|
|
/*** Public C++ API ***/
|
|
|
|
/*! api_cpp {{{
|
|
* ##### Brickworks::Balance
|
|
* ```>>> */
|
|
template<size_t N_CHANNELS>
|
|
class Balance {
|
|
public:
|
|
Balance();
|
|
|
|
void setSampleRate(
|
|
float sampleRate);
|
|
|
|
void reset();
|
|
|
|
void process(
|
|
const float * const * xL,
|
|
const float * const * xR,
|
|
float * const * yL,
|
|
float * const * yR,
|
|
size_t nSamples);
|
|
|
|
void process(
|
|
std::array<const float *, N_CHANNELS> xL,
|
|
std::array<const float *, N_CHANNELS> xR,
|
|
std::array<float *, N_CHANNELS> yL,
|
|
std::array<float *, N_CHANNELS> yR,
|
|
size_t nSamples);
|
|
|
|
void setBalance(
|
|
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_balance_coeffs coeffs;
|
|
};
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline Balance<N_CHANNELS>::Balance() {
|
|
bw_balance_init(&coeffs);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void Balance<N_CHANNELS>::setSampleRate(
|
|
float sampleRate) {
|
|
bw_balance_set_sample_rate(&coeffs, sampleRate);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void Balance<N_CHANNELS>::reset() {
|
|
bw_balance_reset_coeffs(&coeffs);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void Balance<N_CHANNELS>::process(
|
|
const float * const * xL,
|
|
const float * const * xR,
|
|
float * const * yL,
|
|
float * const * yR,
|
|
size_t nSamples) {
|
|
bw_balance_process_multi(&coeffs, xL, xR, yL, yR, N_CHANNELS, nSamples);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void Balance<N_CHANNELS>::process(
|
|
std::array<const float *, N_CHANNELS> xL,
|
|
std::array<const float *, N_CHANNELS> xR,
|
|
std::array<float *, N_CHANNELS> yL,
|
|
std::array<float *, N_CHANNELS> yR,
|
|
size_t nSamples) {
|
|
process(xL.data(), xR.data(), yL.data(), yR.data(), nSamples);
|
|
}
|
|
|
|
template<size_t N_CHANNELS>
|
|
inline void Balance<N_CHANNELS>::setBalance(
|
|
float value) {
|
|
bw_balance_set_balance(&coeffs, value);
|
|
}
|
|
|
|
}
|
|
#endif
|
|
|
|
#endif
|