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#include "ltfat.h"
#include "ltfat_types.h"
struct LTFAT_NAME(upconv_fft_plan_struct)
{
const ltfatInt L;
const ltfatInt W;
const ltfatInt a;
const LTFAT_FFTW(plan) p_c;
LTFAT_COMPLEX* buf;
const ltfatInt bufLen;
};
struct LTFAT_NAME(upconv_fftbl_plan_struct)
{
const ltfatInt L;
const ltfatInt Gl;
const ltfatInt W;
const double a;
const LTFAT_FFTW(plan) p_c;
LTFAT_COMPLEX* buf;
const ltfatInt bufLen;
};
LTFAT_EXTERN void
LTFAT_NAME(ifilterbank_fft)(const LTFAT_COMPLEX *cin[], const LTFAT_COMPLEX *G[],
const ltfatInt L, const ltfatInt W, const ltfatInt a[],
const ltfatInt M, LTFAT_COMPLEX *F)
{
// This is necessary since F us used as an accumulator
memset(F, 0, L * W * sizeof * F);
for (ltfatInt m = 0; m < M; m++)
{
LTFAT_NAME(upconv_fft)(cin[m], G[m], L, W, a[m], F);
}
}
LTFAT_EXTERN void
LTFAT_NAME(ifilterbank_fft_execute)(LTFAT_NAME(upconv_fft_plan) p[],
const LTFAT_COMPLEX *cin[],
const LTFAT_COMPLEX *G[],
const ltfatInt M,
LTFAT_COMPLEX *F )
{
ltfatInt L = p[0]->L;
ltfatInt W = p[0]->W;
// This is necessary since F us used as an accumulator
memset(F, 0, W * L * sizeof * F);
for (ltfatInt m = 0; m < M; m++)
{
LTFAT_NAME(upconv_fft_execute)(p[m], cin[m], G[m], F);
}
}
// Inverse
LTFAT_EXTERN void
LTFAT_NAME(upconv_fft)(const LTFAT_COMPLEX *cin, const LTFAT_COMPLEX *G,
const ltfatInt L, const ltfatInt W, const ltfatInt a,
LTFAT_COMPLEX *F)
{
LTFAT_NAME(upconv_fft_plan) p =
LTFAT_NAME(upconv_fft_init)(L, W, a);
LTFAT_NAME(upconv_fft_execute)(p, cin, G, F);
LTFAT_NAME(upconv_fft_done)(p);
}
LTFAT_EXTERN LTFAT_NAME(upconv_fft_plan)
LTFAT_NAME(upconv_fft_init)(const ltfatInt L, const ltfatInt W, const ltfatInt a)
{
ltfatInt N = L / a;
int Nint = (int) N;
const LTFAT_FFTW(iodim) dims = {.n = Nint, .is = 1, .os = 1};
const LTFAT_FFTW(iodim) howmany_dims = {.n = W, .is = Nint, .os = Nint};
LTFAT_COMPLEX* buf = ltfat_malloc(W * N * sizeof * buf);
LTFAT_FFTW(plan) p_many =
LTFAT_FFTW(plan_guru_dft)(1, &dims, 1, &howmany_dims,
buf, buf,
FFTW_FORWARD, FFTW_ESTIMATE);
struct LTFAT_NAME(upconv_fft_plan_struct) p_struct =
{ .L = L, .a = a, .W = W, .p_c = p_many, .buf = buf, .bufLen = W * N };
LTFAT_NAME(upconv_fft_plan) p = ltfat_malloc(sizeof * p);
memcpy(p, &p_struct, sizeof * p);
return p;
}
LTFAT_EXTERN void
LTFAT_NAME(upconv_fft_execute)(LTFAT_NAME(upconv_fft_plan) p,
const LTFAT_COMPLEX *cin, const LTFAT_COMPLEX *G,
LTFAT_COMPLEX *F)
{
const ltfatInt L = p->L;
const ltfatInt a = p->a;
const ltfatInt W = p->W;
LTFAT_COMPLEX* buf = p->buf;
ltfatInt N = L / a;
memcpy(buf, cin, W * N * sizeof * cin);
// New array execution, inplace
LTFAT_FFTW(execute_dft)(p->p_c, buf, buf);
for (ltfatInt w = 0; w < W; w++)
{
LTFAT_COMPLEX *FPtr = F + w * L;
LTFAT_COMPLEX *GPtr = (LTFAT_COMPLEX *) G;
for (ltfatInt jj = 0; jj < a; jj++)
{
for (ltfatInt ii = 0; ii < N; ii++)
{
// Really readable ;)
*FPtr++ += LTFAT_COMPLEXH(conj)(*GPtr++) * buf[ii + N * w];
}
}
}
}
LTFAT_EXTERN void
LTFAT_NAME(upconv_fft_done)(LTFAT_NAME(upconv_fft_plan) p)
{
LTFAT_FFTW(destroy_plan)(p->p_c);
ltfat_free(p->buf);
}
LTFAT_EXTERN void
LTFAT_NAME(ifilterbank_fftbl)(const LTFAT_COMPLEX *cin[], const LTFAT_COMPLEX *G[],
const ltfatInt L, const ltfatInt Gl[],
const ltfatInt W, const double a[], const ltfatInt M,
const ltfatInt foff[], const int realonly[],
LTFAT_COMPLEX *F)
{
// This is necessary since F us used as an accumulator
memset(F, 0, W * L * sizeof * F);
for (ltfatInt m = 0; m < M; m++)
{
LTFAT_NAME(upconv_fftbl)(cin[m], G[m], L, Gl[m], W, a[m], foff[m],
realonly[m], F);
}
}
LTFAT_EXTERN void
LTFAT_NAME(ifilterbank_fftbl_execute)(LTFAT_NAME(upconv_fftbl_plan) p[],
const LTFAT_COMPLEX *cin[],
const LTFAT_COMPLEX *G[],
const ltfatInt M, const ltfatInt foff[],
const int realonly[],
LTFAT_COMPLEX *F)
{
ltfatInt L = p[0]->L;
ltfatInt W = p[0]->W;
// This is necessary since F us used as an accumulator
memset(F, 0, W * L * sizeof * F);
for (ltfatInt m = 0; m < M; m++)
{
LTFAT_NAME(upconv_fftbl_execute)(p[m], cin[m], G[m], foff[m], realonly[m], F);
}
}
LTFAT_EXTERN void
LTFAT_NAME(upconv_fftbl)(const LTFAT_COMPLEX *cin, const LTFAT_COMPLEX *G,
const ltfatInt L, const ltfatInt Gl, const ltfatInt W,
const double a,
const ltfatInt foff, const int realonly,
LTFAT_COMPLEX *F)
{
LTFAT_NAME(upconv_fftbl_plan) p =
LTFAT_NAME(upconv_fftbl_init)( L, Gl, W, a);
LTFAT_NAME(upconv_fftbl_execute)(p, cin, G, foff, realonly, F);
LTFAT_NAME(upconv_fftbl_done)( p);
}
LTFAT_EXTERN LTFAT_NAME(upconv_fftbl_plan)
LTFAT_NAME(upconv_fftbl_init)( const ltfatInt L, const ltfatInt Gl,
const ltfatInt W, const double a)
{
ltfatInt N = (ltfatInt) floor(L / a + 0.5);
int Nint = (int) N;
const LTFAT_FFTW(iodim) dims = {.n = Nint, .is = 1, .os = 1};
const LTFAT_FFTW(iodim) howmany_dims = {.n = W, .is = Nint, .os = Nint};
LTFAT_COMPLEX* buf = ltfat_malloc(N * W * sizeof * buf);
LTFAT_FFTW(plan) p_many =
LTFAT_FFTW(plan_guru_dft)(1, &dims, 1, &howmany_dims,
buf, buf,
FFTW_FORWARD, FFTW_ESTIMATE);
struct LTFAT_NAME(upconv_fftbl_plan_struct) p_struct =
{
.L = L, .Gl = Gl, .a = a, .W = W,
.p_c = p_many, .buf = buf, .bufLen = N * W
};
LTFAT_NAME(upconv_fftbl_plan) p = ltfat_malloc(sizeof * p);
memcpy(p, &p_struct, sizeof * p);
return p;
}
LTFAT_EXTERN void
LTFAT_NAME(upconv_fftbl_execute)(const LTFAT_NAME(upconv_fftbl_plan) p,
const LTFAT_COMPLEX *cin, const LTFAT_COMPLEX *G,
const ltfatInt foff,
const int realonly, LTFAT_COMPLEX *F)
{
const ltfatInt Gl = p->Gl;
if(!Gl) return; // Bail out if filter has zero bandwidth
const ltfatInt L = p->L;
const ltfatInt W = p->W;
const double a = p->a;
LTFAT_COMPLEX* cbuf = p->buf;
ltfatInt N = (ltfatInt) floor(L / a + 0.5);
memcpy(cbuf, cin, N * W * sizeof * cin);
LTFAT_FFTW(execute_dft)(p->p_c, cbuf, cbuf);
for (ltfatInt w = 0; w < W; w++)
{
LTFAT_NAME_COMPLEX(circshift)(cbuf + w * N, cbuf + w * N, N, -foff);
//LTFAT_NAME_COMPLEX(circshift)(cbuf+w*N,cbuf+w*N,N,Gl/2);
const LTFAT_COMPLEX* GPtrTmp = G;
LTFAT_COMPLEX* FPtrTmp = F + w * L;
LTFAT_COMPLEX* CPtrTmp = cbuf + w * N;
// Determine range of G
ltfatInt foffTmp = foff;
ltfatInt tmpLg = N < Gl ? N : Gl;
ltfatInt over = 0;
if (foffTmp + tmpLg > (ltfatInt)L)
{
over = foffTmp + tmpLg - (ltfatInt)L;
}
if (foffTmp < 0)
{
ltfatInt toCopy = (-foffTmp) < tmpLg ? -foffTmp : tmpLg;
FPtrTmp = F + (w + 1) * L + foffTmp;
for (ltfatInt ii = 0; ii < toCopy; ii++)
{
LTFAT_COMPLEX tmp = *CPtrTmp++ * LTFAT_COMPLEXH(conj)(*GPtrTmp++);
FPtrTmp[ii] += tmp;
}
tmpLg -= toCopy;
foffTmp = 0;
}
FPtrTmp = F + w * L + foffTmp;
for (ltfatInt ii = 0; ii < tmpLg - over; ii++)
{
LTFAT_COMPLEX tmp = *CPtrTmp++ * LTFAT_COMPLEXH(conj)(*GPtrTmp++);
FPtrTmp[ii] += tmp;
}
FPtrTmp = F + w * L;
for (ltfatInt ii = 0; ii < over; ii++)
{
LTFAT_COMPLEX tmp = (*CPtrTmp++ * LTFAT_COMPLEXH(conj)(*GPtrTmp++));
FPtrTmp[ii] += tmp;
}
}
if (realonly)
{
const ltfatInt foffconj = -L + positiverem(L - foff - Gl, L) + 1;
LTFAT_COMPLEX *Gconj = ltfat_malloc(Gl * sizeof * Gconj);
LTFAT_NAME_COMPLEX(reverse_array)((LTFAT_COMPLEX *)G, Gconj, Gl);
LTFAT_NAME_COMPLEX(conjugate_array)(Gconj, Gconj, Gl);
LTFAT_NAME(upconv_fftbl_execute)(p, cin, Gconj, foffconj, 0, F);
ltfat_free(Gconj);
}
}
LTFAT_EXTERN void
LTFAT_NAME(upconv_fftbl_done)(LTFAT_NAME(upconv_fftbl_plan) p)
{
LTFAT_FFTW(destroy_plan)(p->p_c);
if(p->buf) ltfat_free(p->buf);
}
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