ref: c37bc1969be3955f877f6af005dd841b68f457d5
dir: /python/ext/py-phasevoc.c/
#include "aubio-types.h"
static char Py_pvoc_doc[] = ""
"pvoc(win_s=512, hop_s=256)\n"
"\n"
"Phase vocoder.\n"
"\n"
"`pvoc` creates callable object implements a phase vocoder [1]_,\n"
"using the tricks detailed in [2]_.\n"
"\n"
"The call function takes one input of type `fvec` and of size\n"
"`hop_s`, and returns a `cvec` of length `win_s//2+1`.\n"
"\n"
"Parameters\n"
"----------\n"
"win_s : int\n"
" number of channels in the phase-vocoder.\n"
"hop_s : int\n"
" number of samples expected between each call\n"
"\n"
"Examples\n"
"--------\n"
">>> x = aubio.fvec(256)\n"
">>> pv = aubio.pvoc(512, 256)\n"
">>> pv(x)\n"
"aubio cvec of 257 elements\n"
"\n"
"Default values for hop_s and win_s are provided:\n"
"\n"
">>> pv = aubio.pvoc()\n"
">>> pv.win_s, pv.hop_s\n"
"512, 256\n"
"\n"
"A `cvec` can be resynthesised using `rdo()`:\n"
"\n"
">>> pv = aubio.pvoc(512, 256)\n"
">>> y = aubio.cvec(512)\n"
">>> x_reconstructed = pv.rdo(y)\n"
">>> x_reconstructed.shape\n"
"(256,)\n"
"\n"
"References\n"
"----------\n"
".. [1] James A. Moorer. The use of the phase vocoder in computer music\n"
" applications. `Journal of the Audio Engineering Society`,\n"
" 26(1/2):42–45, 1978.\n"
".. [2] Amalia de Götzen, Nicolas Bernardini, and Daniel Arfib. Traditional\n"
" (?) implementations of a phase vocoder: the tricks of the trade.\n"
" In `Proceedings of the International Conference on Digital Audio\n"
" Effects` (DAFx-00), pages 37–44, University of Verona, Italy, 2000.\n"
" (`online version <"
"https://www.cs.princeton.edu/courses/archive/spr09/cos325/Bernardini.pdf"
">`_).\n"
"";
typedef struct
{
PyObject_HEAD
aubio_pvoc_t * o;
uint_t win_s;
uint_t hop_s;
fvec_t vecin;
cvec_t cvecin;
PyObject *output;
cvec_t c_output;
PyObject *routput;
fvec_t c_routput;
} Py_pvoc;
static PyObject *
Py_pvoc_new (PyTypeObject * type, PyObject * args, PyObject * kwds)
{
int win_s = 0, hop_s = 0;
Py_pvoc *self;
static char *kwlist[] = { "win_s", "hop_s", NULL };
if (!PyArg_ParseTupleAndKeywords (args, kwds, "|II", kwlist,
&win_s, &hop_s)) {
return NULL;
}
self = (Py_pvoc *) type->tp_alloc (type, 0);
if (self == NULL) {
return NULL;
}
self->win_s = Py_default_vector_length;
self->hop_s = Py_default_vector_length/2;
if (win_s > 0) {
self->win_s = win_s;
} else if (win_s < 0) {
PyErr_SetString (PyExc_ValueError,
"can not use negative window size");
return NULL;
}
if (hop_s > 0) {
self->hop_s = hop_s;
} else if (hop_s < 0) {
PyErr_SetString (PyExc_ValueError,
"can not use negative hop size");
return NULL;
}
return (PyObject *) self;
}
static int
Py_pvoc_init (Py_pvoc * self, PyObject * args, PyObject * kwds)
{
self->o = new_aubio_pvoc ( self->win_s, self->hop_s);
if (self->o == NULL) {
// PyErr_Format(PyExc_RuntimeError, ...) was set above by new_ which called
// AUBIO_ERR when failing
return -1;
}
self->output = new_py_cvec(self->win_s);
self->routput = new_py_fvec(self->hop_s);
return 0;
}
static void
Py_pvoc_del (Py_pvoc *self, PyObject *unused)
{
Py_XDECREF(self->output);
Py_XDECREF(self->routput);
if (self->o) {
del_aubio_pvoc(self->o);
}
Py_TYPE(self)->tp_free((PyObject *) self);
}
static PyObject *
Py_pvoc_do(Py_pvoc * self, PyObject * args)
{
PyObject *input;
if (!PyArg_ParseTuple (args, "O", &input)) {
return NULL;
}
if (!PyAubio_ArrayToCFvec (input, &(self->vecin) )) {
return NULL;
}
if (self->vecin.length != self->hop_s) {
PyErr_Format(PyExc_ValueError,
"input fvec has length %d, but pvoc expects length %d",
self->vecin.length, self->hop_s);
return NULL;
}
Py_INCREF(self->output);
if (!PyAubio_PyCvecToCCvec (self->output, &(self->c_output))) {
return NULL;
}
// compute the function
aubio_pvoc_do (self->o, &(self->vecin), &(self->c_output));
return self->output;
}
static PyMemberDef Py_pvoc_members[] = {
{"win_s", T_INT, offsetof (Py_pvoc, win_s), READONLY,
"int: Size of phase vocoder analysis windows, in samples.\n"
""},
{"hop_s", T_INT, offsetof (Py_pvoc, hop_s), READONLY,
"int: Interval between two analysis, in samples.\n"
""},
{ NULL } // sentinel
};
static PyObject *
Py_pvoc_rdo(Py_pvoc * self, PyObject * args)
{
PyObject *input;
if (!PyArg_ParseTuple (args, "O", &input)) {
return NULL;
}
if (!PyAubio_PyCvecToCCvec (input, &(self->cvecin) )) {
return NULL;
}
if (self->cvecin.length != self->win_s / 2 + 1) {
PyErr_Format(PyExc_ValueError,
"input cvec has length %d, but pvoc expects length %d",
self->cvecin.length, self->win_s / 2 + 1);
return NULL;
}
Py_INCREF(self->routput);
if (!PyAubio_ArrayToCFvec(self->routput, &(self->c_routput)) ) {
return NULL;
}
// compute the function
aubio_pvoc_rdo (self->o, &(self->cvecin), &(self->c_routput));
return self->routput;
}
static PyObject *
Pyaubio_pvoc_set_window (Py_pvoc *self, PyObject *args)
{
uint_t err = 0;
char_t *window = NULL;
if (!PyArg_ParseTuple (args, "s", &window)) {
return NULL;
}
err = aubio_pvoc_set_window (self->o, window);
if (err > 0) {
PyErr_SetString (PyExc_ValueError, "error running aubio_pvoc_set_window");
return NULL;
}
Py_RETURN_NONE;
}
static PyMethodDef Py_pvoc_methods[] = {
{"rdo", (PyCFunction) Py_pvoc_rdo, METH_VARARGS,
"rdo(fftgrain)\n"
"\n"
"Read a new spectral grain and resynthesise the next `hop_s`\n"
"output samples.\n"
"\n"
"Parameters\n"
"----------\n"
"fftgrain : cvec\n"
" new input `cvec` to synthesize from, should be of size `win_s/2+1`\n"
"\n"
"Returns\n"
"-------\n"
"fvec\n"
" re-synthesised output of shape `(hop_s,)`\n"
"\n"
"Example\n"
"-------\n"
">>> pv = aubio.pvoc(2048, 512)\n"
">>> out = pv.rdo(aubio.cvec(2048))\n"
">>> out.shape\n"
"(512,)\n"
""},
{"set_window", (PyCFunction) Pyaubio_pvoc_set_window, METH_VARARGS,
"set_window(window_type)\n"
"\n"
"Set window function\n"
"\n"
"Parameters\n"
"----------\n"
"window_type : str\n"
" the window type to use for this phase vocoder\n"
"\n"
"Raises\n"
"------\n"
"ValueError\n"
" If an unknown window type was given.\n"
"\n"
"See Also\n"
"--------\n"
"window : create a window.\n"
""},
{NULL}
};
PyTypeObject Py_pvocType = {
PyVarObject_HEAD_INIT (NULL, 0)
"aubio.pvoc",
sizeof (Py_pvoc),
0,
(destructor) Py_pvoc_del,
0,
0,
0,
0,
0,
0,
0,
0,
0,
(ternaryfunc)Py_pvoc_do,
0,
0,
0,
0,
Py_TPFLAGS_DEFAULT,
Py_pvoc_doc,
0,
0,
0,
0,
0,
0,
Py_pvoc_methods,
Py_pvoc_members,
0,
0,
0,
0,
0,
0,
(initproc) Py_pvoc_init,
0,
Py_pvoc_new,
0,
0,
0,
0,
0,
0,
0,
0,
0,
};