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