ref: c1c3a9956a7bef38be100dcba0135f02a6b56a41
dir: /python/ext/py-filter.c/
#include "aubio-types.h"
typedef struct
{
PyObject_HEAD
aubio_filter_t * o;
uint_t order;
fvec_t vec;
PyObject *out;
fvec_t c_out;
} Py_filter;
static char Py_filter_doc[] = ""
"digital_filter(order=7)\n"
"\n"
"Create a digital filter.\n"
"";
static char Py_filter_set_c_weighting_doc[] = ""
"set_c_weighting(samplerate)\n"
"\n"
"Set filter coefficients to C-weighting.\n"
"\n"
"`samplerate` should be one of 8000, 11025, 16000, 22050, 24000, 32000,\n"
"44100, 48000, 88200, 96000, or 192000. `order` of the filter should be 5.\n"
"\n"
"Parameters\n"
"----------\n"
"samplerate : int\n"
" Sampling-rate of the input signal, in Hz.\n"
"";
static char Py_filter_set_a_weighting_doc[] = ""
"set_a_weighting(samplerate)\n"
"\n"
"Set filter coefficients to A-weighting.\n"
"\n"
"`samplerate` should be one of 8000, 11025, 16000, 22050, 24000, 32000,\n"
"44100, 48000, 88200, 96000, or 192000. `order` of the filter should be 7.\n"
"\n"
"Parameters\n"
"----------\n"
"samplerate : int\n"
" Sampling-rate of the input signal.\n"
"";
static char Py_filter_set_biquad_doc[] = ""
"set_biquad(b0, b1, b2, a1, a2)\n"
"\n"
"Set biquad coefficients. `order` of the filter should be 3.\n"
"\n"
"Parameters\n"
"----------\n"
"b0 : float\n"
" Forward filter coefficient.\n"
"b1 : float\n"
" Forward filter coefficient.\n"
"b2 : float\n"
" Forward filter coefficient.\n"
"a1 : float\n"
" Feedback filter coefficient.\n"
"a2 : float\n"
" Feedback filter coefficient.\n"
"";
static PyObject *
Py_filter_new (PyTypeObject * type, PyObject * args, PyObject * kwds)
{
int order= 0;
Py_filter *self;
static char *kwlist[] = { "order", NULL };
if (!PyArg_ParseTupleAndKeywords (args, kwds, "|I", kwlist,
&order)) {
return NULL;
}
self = (Py_filter *) type->tp_alloc (type, 0);
if (self == NULL) {
return NULL;
}
self->order = 7;
if (order > 0) {
self->order = order;
} else if (order < 0) {
PyErr_SetString (PyExc_ValueError,
"can not use negative order");
return NULL;
}
return (PyObject *) self;
}
static int
Py_filter_init (Py_filter * self, PyObject * args, PyObject * kwds)
{
self->o = new_aubio_filter (self->order);
if (self->o == NULL) {
return -1;
}
self->out = NULL;
return 0;
}
static void
Py_filter_del (Py_filter * self)
{
Py_XDECREF(self->out);
if (self->o)
del_aubio_filter (self->o);
Py_TYPE(self)->tp_free ((PyObject *) self);
}
static PyObject *
Py_filter_do(Py_filter * self, PyObject * args)
{
PyObject *input;
if (!PyArg_ParseTuple (args, "O:digital_filter.do", &input)) {
return NULL;
}
if (input == NULL) {
return NULL;
}
if (!PyAubio_ArrayToCFvec(input, &(self->vec))) {
return NULL;
}
// initialize output now
if (self->out == NULL) {
self->out = new_py_fvec(self->vec.length);
}
Py_INCREF(self->out);
if (!PyAubio_ArrayToCFvec(self->out, &(self->c_out)) ) {
return NULL;
}
// compute the function
aubio_filter_do_outplace (self->o, &(self->vec), &(self->c_out));
return self->out;
}
static PyObject *
Py_filter_set_c_weighting (Py_filter * self, PyObject *args)
{
uint_t err = 0;
uint_t samplerate;
if (!PyArg_ParseTuple (args, "I", &samplerate)) {
return NULL;
}
err = aubio_filter_set_c_weighting (self->o, samplerate);
if (err > 0) {
PyErr_SetString (PyExc_ValueError,
"error when setting filter to C-weighting");
return NULL;
}
Py_RETURN_NONE;
}
static PyObject *
Py_filter_set_a_weighting (Py_filter * self, PyObject *args)
{
uint_t err = 0;
uint_t samplerate;
if (!PyArg_ParseTuple (args, "I", &samplerate)) {
return NULL;
}
err = aubio_filter_set_a_weighting (self->o, samplerate);
if (err > 0) {
PyErr_SetString (PyExc_ValueError,
"error when setting filter to A-weighting");
return NULL;
}
Py_RETURN_NONE;
}
static PyObject *
Py_filter_set_biquad(Py_filter * self, PyObject *args)
{
uint_t err = 0;
lsmp_t b0, b1, b2, a1, a2;
if (!PyArg_ParseTuple (args, "ddddd", &b0, &b1, &b2, &a1, &a2)) {
return NULL;
}
err = aubio_filter_set_biquad (self->o, b0, b1, b2, a1, a2);
if (err > 0) {
PyErr_SetString (PyExc_ValueError,
"error when setting filter with biquad coefficients");
return NULL;
}
Py_RETURN_NONE;
}
static PyMemberDef Py_filter_members[] = {
// TODO remove READONLY flag and define getter/setter
{"order", T_INT, offsetof (Py_filter, order), READONLY,
"order of the filter"},
{NULL} /* Sentinel */
};
static PyMethodDef Py_filter_methods[] = {
{"set_c_weighting", (PyCFunction) Py_filter_set_c_weighting, METH_VARARGS,
Py_filter_set_c_weighting_doc},
{"set_a_weighting", (PyCFunction) Py_filter_set_a_weighting, METH_VARARGS,
Py_filter_set_a_weighting_doc},
{"set_biquad", (PyCFunction) Py_filter_set_biquad, METH_VARARGS,
Py_filter_set_biquad_doc},
{NULL}
};
PyTypeObject Py_filterType = {
PyVarObject_HEAD_INIT(NULL, 0)
"aubio.digital_filter", /* tp_name */
sizeof (Py_filter), /* tp_basicsize */
0, /* tp_itemsize */
(destructor) Py_filter_del, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, //(reprfunc) Py_filter_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
(ternaryfunc)Py_filter_do, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
Py_filter_doc, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
Py_filter_methods, /* tp_methods */
Py_filter_members, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
(initproc) Py_filter_init, /* tp_init */
0, /* tp_alloc */
Py_filter_new, /* tp_new */
0,
0,
0,
0,
0,
0,
0,
0,
0,
};