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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_COMPLEX_H_
#define PRIVATE_DSP_ARCH_GENERIC_COMPLEX_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 complex_mul2(float *dst_re, float *dst_im, const float *src_re, const float *src_im, size_t count)
{
for (size_t i=0; i<count; ++i)
{
float re = (dst_re[i]) * (src_re[i]) - (dst_im[i]) * (src_im[i]);
float im = (dst_re[i]) * (src_im[i]) + (dst_im[i]) * (src_re[i]);
dst_re[i] = re;
dst_im[i] = im;
}
}
void complex_mul3(float *dst_re, float *dst_im, const float *src1_re, const float *src1_im, const float *src2_re, const float *src2_im, size_t count)
{
for (size_t i=0; i<count; ++i)
{
float re = (src1_re[i]) * (src2_re[i]) - (src1_im[i]) * (src2_im[i]);
float im = (src1_re[i]) * (src2_im[i]) + (src1_im[i]) * (src2_re[i]);
dst_re[i] = re;
dst_im[i] = im;
}
}
void complex_rcp1(float *dst_re, float *dst_im, size_t count)
{
while (count--)
{
float re = *dst_re;
float im = *dst_im;
float mag = 1.0f / (re * re + im * im);
*(dst_re++) = re * mag;
*(dst_im++) = -im * mag;
}
}
void complex_rcp2(float *dst_re, float *dst_im, const float *src_re, const float *src_im, size_t count)
{
while (count--)
{
float re = *(src_re++);
float im = *(src_im++);
float mag = 1.0f / (re * re + im * im);
*(dst_re++) = re * mag;
*(dst_im++) = -im * mag;
}
}
void complex_cvt2modarg(float *dst_mod, float *dst_arg, const float *src_re, const float *src_im, size_t count)
{
while (count--)
{
float r = *(src_re++);
float i = *(src_im++);
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;
*(dst_mod++) = m;
*(dst_arg++) = a;
}
}
void complex_arg(float *dst, const float *re, const float *im, size_t count)
{
while (count--)
{
float r = *(re++);
float i = *(im++);
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;
*(dst++) = a;
}
}
void complex_cvt2reim(float *dst_re, float *dst_im, const float *src_mod, const float *src_arg, size_t count)
{
while (count--)
{
float mod = *(src_mod++);
float arg = *(src_arg++);
*(dst_re++) = mod * cosf(arg);
*(dst_im++) = mod * sinf(arg);
}
}
void complex_mod(float *dst_mod, const float *src_re, const float *src_im, size_t count)
{
while (count--)
{
float re = *(src_re++);
float im = *(src_im++);
*(dst_mod++) = sqrtf(re*re + im*im);
}
}
void complex_div2(float *dst_re, float *dst_im, const float *src_re, const float *src_im, size_t count)
{
for (size_t i=0; i<count; ++i)
{
float re = src_re[i] * dst_re[i] + src_im[i] * dst_im[i];
float im = src_re[i] * dst_im[i] + src_im[i] * dst_re[i];
float n = 1.0f / (src_re[i] * src_re[i] + src_im[i] * src_im[i]);
dst_re[i] = re * n;
dst_im[i] = -im * n;
}
}
void complex_rdiv2(float *dst_re, float *dst_im, const float *src_re, const float *src_im, size_t count)
{
for (size_t i=0; i<count; ++i)
{
float re = src_re[i] * dst_re[i] + src_im[i] * dst_im[i];
float im = src_re[i] * dst_im[i] + src_im[i] * dst_re[i];
float n = 1.0f / (dst_re[i] * dst_re[i] + dst_im[i] * dst_im[i]);
dst_re[i] = re * n;
dst_im[i] = -im * n;
}
}
void complex_div3(float *dst_re, float *dst_im, const float *t_re, const float *t_im, const float *b_re, const float *b_im, size_t count)
{
for (size_t i=0; i<count; ++i)
{
float re = t_re[i] * b_re[i] + t_im[i] * b_im[i];
float im = t_re[i] * b_im[i] + t_im[i] * b_re[i];
float n = 1.0f / (b_re[i] * b_re[i] + b_im[i] * b_im[i]);
dst_re[i] = re * n;
dst_im[i] = -im * n;
}
}
}
}
#endif /* PRIVATE_DSP_ARCH_GENERIC_COMPLEX_H_ */
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