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#include "fftpack.h"
#include "Python.h"
#include "numpy/arrayobject.h"
static PyObject *ErrorObject;
/* ----------------------------------------------------- */
static char fftpack_cfftf__doc__[] ="";
PyObject *
fftpack_cfftf(PyObject *self, PyObject *args)
{
PyObject *op1, *op2;
PyArrayObject *data;
double *wsave, *dptr;
int npts, nsave, nrepeats, i;
if(!PyArg_ParseTuple(args, "OO", &op1, &op2)) return NULL;
data = (PyArrayObject *)PyArray_CopyFromObject(op1, PyArray_CDOUBLE, 1, 0);
if (data == NULL) return NULL;
if (PyArray_As1D(&op2, (char **)&wsave, &nsave, PyArray_DOUBLE) == -1)
goto fail;
if (data == NULL) goto fail;
npts = data->dimensions[data->nd-1];
if (nsave != npts*4+15) {
PyErr_SetString(ErrorObject, "invalid work array for fft size");
goto fail;
}
nrepeats = PyArray_SIZE(data)/npts;
dptr = (double *)data->data;
NPY_SIGINT_ON
for (i=0; i<nrepeats; i++) {
cfftf(npts, dptr, wsave);
dptr += npts*2;
}
NPY_SIGINT_OFF
PyArray_Free(op2, (char *)wsave);
return (PyObject *)data;
fail:
PyArray_Free(op2, (char *)wsave);
Py_DECREF(data);
return NULL;
}
static char fftpack_cfftb__doc__[] ="";
PyObject *
fftpack_cfftb(PyObject *self, PyObject *args)
{
PyObject *op1, *op2;
PyArrayObject *data;
double *wsave, *dptr;
int npts, nsave, nrepeats, i;
if(!PyArg_ParseTuple(args, "OO", &op1, &op2)) return NULL;
data = (PyArrayObject *)PyArray_CopyFromObject(op1, PyArray_CDOUBLE, 1, 0);
if (data == NULL) return NULL;
if (PyArray_As1D(&op2, (char **)&wsave, &nsave, PyArray_DOUBLE) == -1)
goto fail;
if (data == NULL) goto fail;
npts = data->dimensions[data->nd-1];
if (nsave != npts*4+15) {
PyErr_SetString(ErrorObject, "invalid work array for fft size");
goto fail;
}
nrepeats = PyArray_SIZE(data)/npts;
dptr = (double *)data->data;
NPY_SIGINT_ON
for (i=0; i<nrepeats; i++) {
cfftb(npts, dptr, wsave);
dptr += npts*2;
}
NPY_SIGINT_OFF
PyArray_Free(op2, (char *)wsave);
return (PyObject *)data;
fail:
PyArray_Free(op2, (char *)wsave);
Py_DECREF(data);
return NULL;
}
static char fftpack_cffti__doc__[] ="";
static PyObject *
fftpack_cffti(PyObject *self, PyObject *args)
{
PyArrayObject *op;
int dim, n;
if (!PyArg_ParseTuple(args, "i", &n)) return NULL;
dim = 4*n+15; /*Magic size needed by cffti*/
/*Create a 1 dimensional array of dimensions of type double*/
op = (PyArrayObject *)PyArray_FromDims(1, &dim, PyArray_DOUBLE);
if (op == NULL) return NULL;
NPY_SIGINT_ON
cffti(n, (double *)((PyArrayObject*)op)->data);
NPY_SIGINT_OFF
return (PyObject *)op;
}
static char fftpack_rfftf__doc__[] ="";
PyObject *
fftpack_rfftf(PyObject *self, PyObject *args)
{
PyObject *op1, *op2;
PyArrayObject *data, *ret;
double *wsave, *dptr, *rptr;
int npts, nsave, nrepeats, i, rstep;
if(!PyArg_ParseTuple(args, "OO", &op1, &op2)) return NULL;
data = (PyArrayObject *)PyArray_ContiguousFromObject(op1, PyArray_DOUBLE, 1, 0);
if (data == NULL) return NULL;
npts = data->dimensions[data->nd-1];
data->dimensions[data->nd-1] = npts/2+1;
ret = (PyArrayObject *)PyArray_Zeros(data->nd, data->dimensions,
PyArray_DescrFromType(PyArray_CDOUBLE), 0);
data->dimensions[data->nd-1] = npts;
rstep = (ret->dimensions[ret->nd-1])*2;
if (PyArray_As1D(&op2, (char **)&wsave, &nsave, PyArray_DOUBLE) == -1)
goto fail;
if (data == NULL || ret == NULL) goto fail;
if (nsave != npts*2+15) {
PyErr_SetString(ErrorObject, "invalid work array for fft size");
goto fail;
}
nrepeats = PyArray_SIZE(data)/npts;
rptr = (double *)ret->data;
dptr = (double *)data->data;
NPY_SIGINT_ON
for (i=0; i<nrepeats; i++) {
memcpy((char *)(rptr+1), dptr, npts*sizeof(double));
rfftf(npts, rptr+1, wsave);
rptr[0] = rptr[1];
rptr[1] = 0.0;
rptr += rstep;
dptr += npts;
}
NPY_SIGINT_OFF
PyArray_Free(op2, (char *)wsave);
Py_DECREF(data);
return (PyObject *)ret;
fail:
PyArray_Free(op2, (char *)wsave);
Py_XDECREF(data);
Py_XDECREF(ret);
return NULL;
}
static char fftpack_rfftb__doc__[] ="";
PyObject *
fftpack_rfftb(PyObject *self, PyObject *args)
{
PyObject *op1, *op2;
PyArrayObject *data, *ret;
double *wsave, *dptr, *rptr;
int npts, nsave, nrepeats, i;
if(!PyArg_ParseTuple(args, "OO", &op1, &op2)) return NULL;
data = (PyArrayObject *)PyArray_ContiguousFromObject(op1, PyArray_CDOUBLE, 1, 0);
if (data == NULL) return NULL;
npts = data->dimensions[data->nd-1];
ret = (PyArrayObject *)PyArray_Zeros(data->nd, data->dimensions,
PyArray_DescrFromType(PyArray_DOUBLE), 0);
if (PyArray_As1D(&op2, (char **)&wsave, &nsave, PyArray_DOUBLE) == -1)
goto fail;
if (data == NULL || ret == NULL) goto fail;
if (nsave != npts*2+15) {
PyErr_SetString(ErrorObject, "invalid work array for fft size");
goto fail;
}
nrepeats = PyArray_SIZE(ret)/npts;
rptr = (double *)ret->data;
dptr = (double *)data->data;
NPY_SIGINT_ON
for (i=0; i<nrepeats; i++) {
memcpy((char *)(rptr+1), (dptr+2), (npts-1)*sizeof(double));
rptr[0] = dptr[0];
rfftb(npts, rptr, wsave);
rptr += npts;
dptr += npts*2;
}
NPY_SIGINT_OFF
PyArray_Free(op2, (char *)wsave);
Py_DECREF(data);
return (PyObject *)ret;
fail:
PyArray_Free(op2, (char *)wsave);
Py_XDECREF(data);
Py_XDECREF(ret);
return NULL;
}
static char fftpack_rffti__doc__[] ="";
static PyObject *
fftpack_rffti(PyObject *self, PyObject *args)
{
PyArrayObject *op;
int dim, n;
if (!PyArg_ParseTuple(args, "i", &n)) return NULL;
dim = 2*n+15; /*Magic size needed by rffti*/
/*Create a 1 dimensional array of dimensions of type double*/
op = (PyArrayObject *)PyArray_FromDims(1, &dim, PyArray_DOUBLE);
if (op == NULL) return NULL;
NPY_SIGINT_ON
rffti(n, (double *)((PyArrayObject*)op)->data);
NPY_SIGINT_OFF
return (PyObject *)op;
}
/* List of methods defined in the module */
static struct PyMethodDef fftpack_methods[] = {
{"cfftf", fftpack_cfftf, 1, fftpack_cfftf__doc__},
{"cfftb", fftpack_cfftb, 1, fftpack_cfftb__doc__},
{"cffti", fftpack_cffti, 1, fftpack_cffti__doc__},
{"rfftf", fftpack_rfftf, 1, fftpack_rfftf__doc__},
{"rfftb", fftpack_rfftb, 1, fftpack_rfftb__doc__},
{"rffti", fftpack_rffti, 1, fftpack_rffti__doc__},
{NULL, NULL} /* sentinel */
};
/* Initialization function for the module (*must* be called initfftpack) */
static char fftpack_module_documentation[] =
""
;
PyMODINIT_FUNC initfftpack_lite(void)
{
PyObject *m, *d;
/* Create the module and add the functions */
m = Py_InitModule4("fftpack_lite", fftpack_methods,
fftpack_module_documentation,
(PyObject*)NULL,PYTHON_API_VERSION);
/* Import the array object */
import_array();
/* Add some symbolic constants to the module */
d = PyModule_GetDict(m);
ErrorObject = PyErr_NewException("fftpack.error", NULL, NULL);
PyDict_SetItemString(d, "error", ErrorObject);
/* XXXX Add constants here */
}
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