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