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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-dsp-lib
* Created on: 31 мар. 2020 г.
*
* lsp-dsp-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-dsp-lib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-dsp-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef PRIVATE_DSP_ARCH_GENERIC_PCOMPLEX_H_
#define PRIVATE_DSP_ARCH_GENERIC_PCOMPLEX_H_
#ifndef PRIVATE_DSP_ARCH_GENERIC_IMPL
#error "This header should not be included directly"
#endif /* PRIVATE_DSP_ARCH_GENERIC_IMPL */
namespace lsp
{
namespace generic
{
void pcomplex_mul2(float *dst, const float *src, size_t count)
{
while (count--)
{
// Use temporaries to prevent dst_re and dst_im to be the same to one of the sources
float res_re = (dst[0]) * (src[0]) - (dst[1]) * (src[1]);
float res_im = (dst[0]) * (src[1]) + (dst[1]) * (src[0]);
// Store values
dst[0] = res_re;
dst[1] = res_im;
// Update pointers
src += 2;
dst += 2;
}
}
void pcomplex_mul3(float *dst, const float *src1, const float *src2, size_t count)
{
while (count--)
{
// Use temporaries to prevent dst_re and dst_im to be the same to one of the sources
float res_re = (src1[0]) * (src2[0]) - (src1[1]) * (src2[1]);
float res_im = (src1[0]) * (src2[1]) + (src1[1]) * (src2[0]);
// Store values
dst[0] = res_re;
dst[1] = res_im;
// Update pointers
src1 += 2;
src2 += 2;
dst += 2;
}
}
void pcomplex_rcp1(float *dst, size_t count)
{
while (count--)
{
float re = dst[0];
float im = dst[1];
float mag = 1.0f / (re * re + im * im);
*(dst++) = re * mag;
*(dst++) = -im * mag;
}
}
void pcomplex_rcp2(float *dst, const float *src, size_t count)
{
while (count--)
{
float re = *(src++);
float im = *(src++);
float mag = 1.0f / (re * re + im * im);
*(dst++) = re * mag;
*(dst++) = -im * mag;
}
}
void pcomplex_r2c(float *dst, const float *src, size_t count)
{
if (dst == src)
{
// Do backward copy
dst += (count-1) << 1;
src += (count-1);
while (count--)
{
dst[0] = *(src--);
dst[1] = 0.0f;
dst -= 2;
}
}
else
{
// Do forward copy
while (count--)
{
dst[0] = *(src++);
dst[1] = 0.0f;
dst += 2;
}
}
}
void pcomplex_fill_ri(float *dst, float re, float im, size_t count)
{
while (count --)
{
dst[0] = re;
dst[1] = im;
dst += 2;
}
}
void pcomplex_c2r(float *dst, const float *src, size_t count)
{
while (count --)
{
*(dst++) = *src;
src += 2;
}
}
void pcomplex_c2r_add2(float *dst, const float *src, size_t count)
{
while (count --)
{
*(dst++) += *src;
src += 2;
}
}
void pcomplex_c2r_sub2(float *dst, const float *src, size_t count)
{
while (count --)
{
*(dst++) -= *src;
src += 2;
}
}
void pcomplex_c2r_rsub2(float *dst, const float *src, size_t count)
{
while (count --)
{
*dst = *src - *dst;
src += 2;
dst ++;
}
}
void pcomplex_c2r_mul2(float *dst, const float *src, size_t count)
{
while (count --)
{
*(dst++) *= *src;
src += 2;
}
}
void pcomplex_c2r_div2(float *dst, const float *src, size_t count)
{
while (count --)
{
*(dst++) /= *src;
src += 2;
}
}
void pcomplex_c2r_rdiv2(float *dst, const float *src, size_t count)
{
while (count --)
{
*dst = *src / *dst;
src += 2;
dst ++;
}
}
void pcomplex_add_r(float *dst, const float *src, size_t count)
{
while (count --)
{
*dst += *(src++);
dst += 2;
}
}
void pcomplex_mod(float *dst_mod, const float *src, size_t count)
{
while (count--)
{
float re = src[0];
float im = src[1];
*(dst_mod++) = sqrtf(re*re + im*im);
src += 2;
}
}
void pcomplex_arg(float *dst, const float *src, size_t count)
{
for (; count > 0; --count, src += 2)
{
float re = src[0];
float im = src[1];
float re2 = re * re;
float im2 = im * im;
float mod = sqrtf(re2 + im2);
float arg = (im != 0.0f) ? 2.0f * atanf((mod - re)/ im) :
(re == 0.0f) ? NAN :
(re < 0.0f) ? M_PI : 0.0f;
*(dst++) = arg;
}
}
void pcomplex_modarg(float *mod, float *arg, const float *src, size_t count)
{
for (; count > 0; --count, src += 2)
{
float r = src[0];
float i = src[1];
float r2 = r * r;
float i2 = i * i;
float m = sqrtf(r2 + i2);
float a = (i != 0.0f) ? 2.0f * atanf((m - r)/ i) :
(r == 0.0f) ? NAN :
(r < 0.0f) ? M_PI : 0.0f;
*(mod++) = m;
*(arg++) = a;
}
}
void pcomplex_div2(float *dst, const float *src, size_t count)
{
while (count--)
{
float re = src[0] * dst[0] + src[1] * dst[1];
float im = src[0] * dst[1] + src[1] * dst[0];
float n = 1.0f / (src[0] * src[0] + src[1] * src[1]);
dst[0] = re * n;
dst[1] = -im * n;
src += 2;
dst += 2;
}
}
void pcomplex_rdiv2(float *dst, const float *src, size_t count)
{
while (count--)
{
float re = src[0] * dst[0] + src[1] * dst[1];
float im = src[0] * dst[1] + src[1] * dst[0];
float n = 1.0f / (dst[0] * dst[0] + dst[1] * dst[1]);
dst[0] = re * n;
dst[1] = -im * n;
src += 2;
dst += 2;
}
}
void pcomplex_div3(float *dst, const float *t, const float *b, size_t count)
{
while (count--)
{
float re = t[0] * b[0] + t[1] * b[1];
float im = t[0] * b[1] + t[1] * b[0];
float n = 1.0f / (b[0] * b[0] + b[1] * b[1]);
dst[0] = re * n;
dst[1] = -im * n;
t += 2;
b += 2;
dst += 2;
}
}
}
}
#endif /* PRIVATE_DSP_ARCH_GENERIC_PCOMPLEX_H_ */
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