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#include "config.h"
#include "splitter.h"
#include <cmath>
#include <algorithm>
#include "math_defs.h"
void bandsplit_init(BandSplitter *splitter, ALfloat f0norm)
{
ALfloat w = f0norm * F_TAU;
ALfloat cw = std::cos(w);
if(cw > FLT_EPSILON)
splitter->coeff = (std::sin(w) - 1.0f) / cw;
else
splitter->coeff = cw * -0.5f;
splitter->lp_z1 = 0.0f;
splitter->lp_z2 = 0.0f;
splitter->hp_z1 = 0.0f;
}
void bandsplit_clear(BandSplitter *splitter)
{
splitter->lp_z1 = 0.0f;
splitter->lp_z2 = 0.0f;
splitter->hp_z1 = 0.0f;
}
void bandsplit_process(BandSplitter *splitter, ALfloat *RESTRICT hpout, ALfloat *RESTRICT lpout,
const ALfloat *input, ALsizei count)
{
ASSUME(count > 0);
const float ap_coeff{splitter->coeff};
const float lp_coeff{splitter->coeff*0.5f + 0.5f};
float lp_z1{splitter->lp_z1};
float lp_z2{splitter->lp_z2};
float ap_z1{splitter->hp_z1};
auto proc_sample = [ap_coeff,lp_coeff,&lp_z1,&lp_z2,&ap_z1,&lpout](const float in) noexcept -> float
{
/* Low-pass sample processing. */
float d{(in - lp_z1) * lp_coeff};
float lp_y{lp_z1 + d};
lp_z1 = lp_y + d;
d = (lp_y - lp_z2) * lp_coeff;
lp_y = lp_z2 + d;
lp_z2 = lp_y + d;
*(lpout++) = lp_y;
/* All-pass sample processing. */
float ap_y{in*ap_coeff + ap_z1};
ap_z1 = in - ap_y*ap_coeff;
/* High-pass generated from removing low-passed output. */
return ap_y - lp_y;
};
std::transform<const float*RESTRICT>(input, input+count, hpout, proc_sample);
splitter->lp_z1 = lp_z1;
splitter->lp_z2 = lp_z2;
splitter->hp_z1 = ap_z1;
}
void splitterap_init(SplitterAllpass *splitter, ALfloat f0norm)
{
ALfloat w = f0norm * F_TAU;
ALfloat cw = std::cos(w);
if(cw > FLT_EPSILON)
splitter->coeff = (std::sin(w) - 1.0f) / cw;
else
splitter->coeff = cw * -0.5f;
splitter->z1 = 0.0f;
}
void splitterap_clear(SplitterAllpass *splitter)
{
splitter->z1 = 0.0f;
}
void splitterap_process(SplitterAllpass *splitter, ALfloat *RESTRICT samples, ALsizei count)
{
ASSUME(count > 0);
const float coeff{splitter->coeff};
float z1{splitter->z1};
auto proc_sample = [coeff,&z1](const float in) noexcept -> float
{
float out{in*coeff + z1};
z1 = in - out*coeff;
return out;
};
std::transform(samples, samples+count, samples, proc_sample);
splitter->z1 = z1;
}
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