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#include "ltfat.h"
#include "ltfat_types.h"
LTFAT_EXTERN void
LTFAT_NAME(nonsepwin2multi)(const LTFAT_COMPLEX *g,
const ltfatInt L, const ltfatInt Lg, const ltfatInt a, const ltfatInt M,
const ltfatInt lt1, const ltfatInt lt2,
LTFAT_COMPLEX *mwin)
{
const ltfatInt b = L / M;
const LTFAT_REAL scal = 2 * PI / L;
LTFAT_COMPLEX *gwork = (LTFAT_COMPLEX *)ltfat_malloc(L * sizeof(LTFAT_COMPLEX));
LTFAT_NAME(fir2long_c)((const LTFAT_COMPLEX*)g, Lg, L, (LTFAT_COMPLEX*)gwork);
for (ltfatInt w = 0; w < lt2; w++)
{
const ltfatInt wavenum = ((w * lt1) % lt2) * b / lt2;
for (ltfatInt l = 0; l < L; l++)
{
mwin[l + w * L] = cexp(I * scal * l * wavenum) * gwork[positiverem(l - w * a, L)];
}
}
ltfat_free(gwork);
}
LTFAT_EXTERN LTFAT_NAME(dgt_multi_plan)
LTFAT_NAME(dgt_multi_init)(const LTFAT_COMPLEX *f, const LTFAT_COMPLEX *g,
const ltfatInt L, const ltfatInt Lg,
const ltfatInt W, const ltfatInt a, const ltfatInt M,
const ltfatInt lt1, const ltfatInt lt2,
LTFAT_COMPLEX *cout, unsigned flags)
{
LTFAT_NAME(dgt_multi_plan) plan;
plan.a = a;
plan.M = M;
plan.L = L;
plan.Lg = Lg;
plan.W = W;
plan.lt1 = lt1;
plan.lt2 = lt2;
plan.f = (LTFAT_COMPLEX *)f;
plan.cout = cout;
const ltfatInt N = L / a;
const ltfatInt Ns = N / lt2;
plan.mwin = (LTFAT_COMPLEX *)ltfat_malloc(L * lt2 * sizeof(LTFAT_COMPLEX));
plan.c_scratch = (LTFAT_COMPLEX *)ltfat_malloc(M * Ns * W * sizeof(LTFAT_COMPLEX));
LTFAT_NAME(nonsepwin2multi)(g, L, Lg, a, M, lt1, lt2, plan.mwin);
plan.rect_plan_array = (LTFAT_NAME(dgt_long_plan)*) ltfat_malloc(lt2 * sizeof(LTFAT_NAME(dgt_long_plan)));
for (ltfatInt win = 0; win < lt2; win++)
{
plan.rect_plan_array[win] =
LTFAT_NAME(dgt_long_init)((const LTFAT_COMPLEX*)plan.f,
(const LTFAT_COMPLEX*)(plan.mwin + L * win),
L, W, a * lt2, M,
(LTFAT_COMPLEX*)plan.c_scratch, 0, flags);
}
plan.mod = (LTFAT_COMPLEX*) ltfat_malloc(N * sizeof(LTFAT_COMPLEX));
for (ltfatInt win = 0; win < plan.lt2; win++)
{
for (ltfatInt n = 0; n < Ns; n++)
{
plan.mod[win + n * lt2] = cexp(-2 * PI * I * (a * n * ((win * lt1) % lt2)) / M);
}
}
return plan;
}
LTFAT_EXTERN void
LTFAT_NAME(dgt_multi_execute)(const LTFAT_NAME(dgt_multi_plan) plan)
{
const ltfatInt N = plan.L / plan.a;
const ltfatInt Ns = N / plan.lt2;
const ltfatInt M = plan.M;
const ltfatInt W = plan.W;
const ltfatInt lt2 = plan.lt2;
for (ltfatInt win = 0; win < plan.lt2; win++)
{
LTFAT_NAME(dgt_long_execute)(plan.rect_plan_array[win]);
for (ltfatInt w = 0; w < W; w++)
{
for (ltfatInt n = 0; n < Ns; n++)
{
for (ltfatInt m = 0; m < M; m++)
{
plan.cout[m + win * M + n * lt2 * M + w * M * N] = plan.mod[win + n * lt2] * plan.c_scratch[m + n * M + w * M * Ns];
}
}
}
}
}
LTFAT_EXTERN void
LTFAT_NAME(dgt_multi_done)(LTFAT_NAME(dgt_multi_plan) plan)
{
for (ltfatInt ii = 0; ii < plan.lt2; ii++)
{
LTFAT_NAME(dgt_long_done)(plan.rect_plan_array[ii]);
}
LTFAT_SAFEFREEALL(plan.mod, plan.rect_plan_array, plan.c_scratch, plan.mwin);
}
LTFAT_EXTERN void
LTFAT_NAME(dgt_multi)(const LTFAT_COMPLEX *f, const LTFAT_COMPLEX *g,
const ltfatInt L, const ltfatInt Lg, const ltfatInt W, const ltfatInt a, const ltfatInt M,
const ltfatInt lt1, const ltfatInt lt2,
LTFAT_COMPLEX *cout)
{
LTFAT_NAME(dgt_multi_plan) plan = LTFAT_NAME(dgt_multi_init)(
f, g, L, Lg, W, a, M, lt1, lt2, cout, FFTW_ESTIMATE);
LTFAT_NAME(dgt_multi_execute)(plan);
LTFAT_NAME(dgt_multi_done)(plan);
}
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