mirror of
https://github.com/love2d/megasource.git
synced 2026-08-12 08:30:59 +02:00
Sasha Szpakowski
92 lines
2.6 KiB
C++
92 lines
2.6 KiB
C++
/*-
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* Copyright (c) 2005 Boris Mikhaylov
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef CORE_BS2B_H
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#define CORE_BS2B_H
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#include <array>
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#include <cstddef>
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#include "alspan.h"
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namespace Bs2b {
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enum {
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/* Normal crossfeed levels */
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LowCLevel = 1,
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MiddleCLevel = 2,
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HighCLevel = 3,
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/* Easy crossfeed levels */
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LowECLevel = 4,
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MiddleECLevel = 5,
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HighECLevel = 6,
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DefaultCLevel = HighECLevel
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};
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struct bs2b {
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int level{}; /* Crossfeed level */
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int srate{}; /* Sample rate (Hz) */
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/* Lowpass IIR filter coefficients */
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float a0_lo{};
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float b1_lo{};
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/* Highboost IIR filter coefficients */
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float a0_hi{};
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float a1_hi{};
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float b1_hi{};
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/* Buffer of filter history
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* [0] - first channel, [1] - second channel
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*/
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struct t_last_sample {
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float lo{};
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float hi{};
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};
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std::array<t_last_sample,2> history{};
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/* Clear buffers and set new coefficients with new crossfeed level and
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* sample rate values.
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* level - crossfeed level of *Level enum values.
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* srate - sample rate by Hz.
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*/
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void set_params(int level, int srate);
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/* Return current crossfeed level value */
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[[nodiscard]] auto get_level() const noexcept -> int { return level; }
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/* Return current sample rate value */
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[[nodiscard]] auto get_srate() const noexcept -> int { return srate; }
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/* Clear buffer */
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void clear();
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void cross_feed(const al::span<float> Left, const al::span<float> Right);
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};
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} // namespace Bs2b
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#endif /* CORE_BS2B_H */
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