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/* ocamlgsl - OCaml interface to GSL */
/* Copyright () 2002 - Olivier Andrieu */
/* distributed under the terms of the GPL version 2 */
#include <caml/fail.h>
#include <caml/memory.h>
#include <caml/callback.h>
#include <gsl/gsl_fft.h>
#include <gsl/gsl_fft_complex.h>
#include <gsl/gsl_fft_halfcomplex.h>
#include <gsl/gsl_fft_real.h>
#include "wrappers.h"
enum mlgsl_fft_array_layout {
LAYOUT_REAL = 0 ,
LAYOUT_HC = 1 ,
LAYOUT_HC_RAD2 = 2 ,
LAYOUT_C = 3 ,
} ;
static void check_layout(value fft_arr,
enum mlgsl_fft_array_layout layout)
{
static value *layout_exn = NULL;
if(Int_val(Field(fft_arr, 0)) != layout) {
if(!layout_exn) {
layout_exn = caml_named_value("mlgsl_layout_exn");
if(!layout_exn) /* Gromeleu */
invalid_argument("wrong fft_array layout");
}
raise_constant(*layout_exn);
}
}
static inline void update_layout(value fft_arr,
enum mlgsl_fft_array_layout layout)
{
Store_field(fft_arr, 0, Val_int(layout));
}
/* WORKSPACE AND WAVETABLES */
#define GSL_REAL_WS(v) ((gsl_fft_real_workspace *)Field((v),0))
#define GSL_COMPLEX_WS(v) ((gsl_fft_complex_workspace *)Field((v),0))
#define GSL_REAL_WT(v) ((gsl_fft_real_wavetable *)Field((v),0))
#define GSL_HALFCOMPLEX_WT(v) ((gsl_fft_halfcomplex_wavetable *)Field((v),0))
#define GSL_COMPLEX_WT(v) ((gsl_fft_complex_wavetable *)Field((v),0))
ML1_alloc(gsl_fft_real_workspace_alloc, Int_val, Abstract_ptr)
ML1_alloc(gsl_fft_complex_workspace_alloc, Int_val, Abstract_ptr)
ML1_alloc(gsl_fft_real_wavetable_alloc, Int_val, Abstract_ptr)
ML1_alloc(gsl_fft_halfcomplex_wavetable_alloc, Int_val, Abstract_ptr)
ML1_alloc(gsl_fft_complex_wavetable_alloc, Int_val, Abstract_ptr)
ML1(gsl_fft_real_workspace_free, GSL_REAL_WS, Unit)
ML1(gsl_fft_complex_workspace_free, GSL_COMPLEX_WS, Unit)
ML1(gsl_fft_real_wavetable_free, GSL_REAL_WT, Unit)
ML1(gsl_fft_halfcomplex_wavetable_free, GSL_HALFCOMPLEX_WT, Unit)
ML1(gsl_fft_complex_wavetable_free, GSL_COMPLEX_WT, Unit)
/* UNPACKING ROUTINES */
value ml_gsl_fft_real_unpack(value stride, value r, value c)
{
const size_t c_stride = Opt_arg(stride, Int_val, 1);
const size_t n = Double_array_length(r);
gsl_fft_real_unpack(Double_array_val(r), Double_array_val(c), c_stride, n) ;
return Val_unit;
}
value ml_gsl_fft_halfcomplex_unpack(value stride, value hc, value c)
{
const size_t c_stride = Opt_arg(stride, Int_val, 1);
const size_t n = Double_array_length(hc);
gsl_fft_halfcomplex_unpack(Double_array_val(hc), Double_array_val(c),
c_stride, n) ;
return Val_unit;
}
value ml_gsl_fft_halfcomplex_unpack_rad2(value stride, value hc, value c)
{
const size_t c_stride = Opt_arg(stride, Int_val ,1);
const size_t n = Double_array_length(hc);
gsl_fft_halfcomplex_radix2_unpack(Double_array_val(hc), Double_array_val(c),
c_stride, n) ;
return Val_unit;
}
/* REAL AND HALFCOMPLEX MIXED-RADIX FFT */
value ml_gsl_fft_real_transform(value stride, value fft_arr, value wt, value ws)
{
value data = Field(fft_arr, 1);
const size_t c_stride = Opt_arg(stride, Int_val, 1);
const size_t n = Double_array_length(data);
check_layout(fft_arr, LAYOUT_REAL);
gsl_fft_real_transform(Double_array_val(data), c_stride, n,
GSL_REAL_WT(wt), GSL_REAL_WS(ws)) ;
update_layout(fft_arr, LAYOUT_HC);
return Val_unit;
}
value ml_gsl_fft_halfcomplex_transform(value stride, value fft_arr,
value wt, value ws)
{
value data = Field(fft_arr, 1);
const size_t c_stride = Opt_arg(stride, Int_val, 1);
const size_t n = Double_array_length(data);
check_layout(fft_arr, LAYOUT_HC);
gsl_fft_halfcomplex_transform(Double_array_val(data), c_stride, n,
GSL_HALFCOMPLEX_WT(wt),
GSL_REAL_WS(ws)) ;
return Val_unit;
}
value ml_gsl_fft_halfcomplex_backward(value stride, value fft_arr,
value wt, value ws)
{
value data = Field(fft_arr, 1);
const size_t c_stride = Opt_arg(stride, Int_val, 1);
const size_t n = Double_array_length(data);
check_layout(fft_arr, LAYOUT_HC);
gsl_fft_halfcomplex_backward(Double_array_val(data), c_stride, n,
GSL_HALFCOMPLEX_WT(wt),
GSL_REAL_WS(ws)) ;
update_layout(fft_arr, LAYOUT_REAL);
return Val_unit;
}
value ml_gsl_fft_halfcomplex_inverse(value stride, value fft_arr,
value wt, value ws)
{
value data = Field(fft_arr, 1);
const size_t c_stride = Opt_arg(stride, Int_val, 1);
const size_t n = Double_array_length(data);
check_layout(fft_arr, LAYOUT_HC);
gsl_fft_halfcomplex_inverse(Double_array_val(data), c_stride, n,
GSL_HALFCOMPLEX_WT(wt),
GSL_REAL_WS(ws)) ;
update_layout(fft_arr, LAYOUT_REAL);
return Val_unit;
}
/* REAL AND HALFCOMPLEX RADIX2 FFT */
value ml_gsl_fft_real_radix2_transform(value stride, value fft_arr)
{
value data = Field(fft_arr, 1);
size_t N = Double_array_length(data);
size_t c_stride = Opt_arg(stride, Int_val, 1);
check_layout(fft_arr, LAYOUT_REAL);
gsl_fft_real_radix2_transform(Double_array_val(data), c_stride, N);
update_layout(fft_arr, LAYOUT_HC_RAD2);
return Val_unit;
}
value ml_gsl_fft_halfcomplex_radix2_transform(value stride, value fft_arr)
{
value data = Field(fft_arr, 1);
size_t N = Double_array_length(data);
size_t c_stride = Opt_arg(stride, Int_val, 1);
check_layout(fft_arr, LAYOUT_HC_RAD2);
gsl_fft_halfcomplex_radix2_transform(Double_array_val(data), c_stride, N);
return Val_unit;
}
value ml_gsl_fft_halfcomplex_radix2_backward(value stride, value fft_arr)
{
value data = Field(fft_arr, 1);
size_t N = Double_array_length(data);
size_t c_stride = Opt_arg(stride, Int_val, 1);
check_layout(fft_arr, LAYOUT_HC_RAD2);
gsl_fft_halfcomplex_radix2_backward(Double_array_val(data),
c_stride, N);
update_layout(fft_arr, LAYOUT_REAL);
return Val_unit;
}
value ml_gsl_fft_halfcomplex_radix2_inverse(value stride, value fft_arr)
{
value data = Field(fft_arr, 1);
size_t N = Double_array_length(data);
size_t c_stride = Opt_arg(stride, Int_val, 1);
check_layout(fft_arr, LAYOUT_HC_RAD2);
gsl_fft_halfcomplex_radix2_inverse(Double_array_val(data), c_stride, N);
update_layout(fft_arr, LAYOUT_REAL);
return Val_unit;
}
/* COMPLEX RADIX-2 FFT */
value ml_gsl_fft_complex_rad2_forward(value dif, value stride, value data)
{
size_t N = Double_array_length(data);
size_t c_stride = Opt_arg(stride, Int_val, 1);
int c_dif = Opt_arg(dif, Bool_val, 0);
if(c_dif)
gsl_fft_complex_radix2_dif_forward(Double_array_val(data), c_stride, N);
else
gsl_fft_complex_radix2_forward(Double_array_val(data), c_stride, N);
return Val_unit;
}
value ml_gsl_fft_complex_rad2_transform(value dif, value stride,
value data, value sign)
{
size_t N = Double_array_length(data);
size_t c_stride = Opt_arg(stride, Int_val, 1);
int c_dif = Opt_arg(dif, Bool_val, 0);
gsl_fft_direction c_sign = (Int_val(sign)==0) ? forward : backward;
if(c_dif)
gsl_fft_complex_radix2_dif_transform(Double_array_val(data), c_stride,
N, c_sign);
else
gsl_fft_complex_radix2_transform(Double_array_val(data), c_stride,
N, c_sign);
return Val_unit;
}
value ml_gsl_fft_complex_rad2_backward(value dif, value stride, value data)
{
size_t N = Double_array_length(data);
size_t c_stride = Opt_arg(stride, Int_val, 1);
int c_dif = Opt_arg(dif, Bool_val, 0);
if(c_dif)
gsl_fft_complex_radix2_dif_backward(Double_array_val(data), c_stride, N);
else
gsl_fft_complex_radix2_backward(Double_array_val(data), c_stride, N);
return Val_unit;
}
value ml_gsl_fft_complex_rad2_inverse(value dif, value stride, value data)
{
size_t N = Double_array_length(data);
size_t c_stride = Opt_arg(stride, Int_val, 1);
int c_dif = Opt_arg(dif, Bool_val, 0);
if(c_dif)
gsl_fft_complex_radix2_dif_inverse(Double_array_val(data), c_stride, N);
else
gsl_fft_complex_radix2_inverse(Double_array_val(data), c_stride, N);
return Val_unit;
}
/* COMPLEX MIXED RADIX FFT */
value ml_gsl_fft_complex_forward(value stride, value data, value wt, value ws)
{
const size_t c_stride = Opt_arg(stride, Int_val, 1);
const size_t n = Double_array_length(data) / 2;
gsl_fft_complex_forward(Double_array_val(data), c_stride, n,
GSL_COMPLEX_WT(wt), GSL_COMPLEX_WS(ws)) ;
return Val_unit;
}
value ml_gsl_fft_complex_transform(value stride, value data,
value wt, value ws, value sign)
{
const size_t c_stride = Opt_arg(stride, Int_val, 1);
const size_t n = Double_array_length(data) / 2;
gsl_fft_direction c_sign = (Int_val(sign)==0) ? forward : backward;
gsl_fft_complex_transform(Double_array_val(data), c_stride, n,
GSL_COMPLEX_WT(wt),
GSL_COMPLEX_WS(ws), c_sign) ;
return Val_unit;
}
value ml_gsl_fft_complex_backward(value stride, value data,
value wt, value ws)
{
const size_t c_stride = Opt_arg(stride, Int_val, 1);
const size_t n = Double_array_length(data) / 2;
gsl_fft_complex_backward(Double_array_val(data), c_stride, n,
GSL_COMPLEX_WT(wt),
GSL_COMPLEX_WS(ws)) ;
return Val_unit;
}
value ml_gsl_fft_complex_inverse(value stride, value data,
value wt, value ws)
{
const size_t c_stride = Opt_arg(stride, Int_val ,1);
const size_t n = Double_array_length(data) / 2;
gsl_fft_complex_inverse(Double_array_val(data), c_stride, n,
GSL_COMPLEX_WT(wt),
GSL_COMPLEX_WS(ws)) ;
return Val_unit;
}
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