source: python/ext/py-source.c @ b8cedb6

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchsampler
Last change on this file since b8cedb6 was b8cedb6, checked in by Paul Brossier <piem@piem.org>, 3 years ago

python/ext/py-source.c: copy string uri

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1#include "aubio-types.h"
2
3typedef struct
4{
5  PyObject_HEAD
6  aubio_source_t * o;
7  char_t* uri;
8  uint_t samplerate;
9  uint_t channels;
10  uint_t hop_size;
11  uint_t duration;
12  PyObject *read_to;
13  fvec_t c_read_to;
14  PyObject *mread_to;
15  fmat_t c_mread_to;
16} Py_source;
17
18static char Py_source_doc[] = ""
19"   __new__(path, samplerate = 0, hop_size = 512, channels = 1)\n"
20"\n"
21"       Create a new source, opening the given path for reading.\n"
22"\n"
23"       Examples\n"
24"       --------\n"
25"\n"
26"       Create a new source, using the original samplerate, with hop_size = 512:\n"
27"\n"
28"       >>> source('/tmp/t.wav')\n"
29"\n"
30"       Create a new source, resampling the original to 8000Hz:\n"
31"\n"
32"       >>> source('/tmp/t.wav', samplerate = 8000)\n"
33"\n"
34"       Create a new source, resampling it at 32000Hz, hop_size = 32:\n"
35"\n"
36"       >>> source('/tmp/t.wav', samplerate = 32000, hop_size = 32)\n"
37"\n"
38"       Create a new source, using its original samplerate:\n"
39"\n"
40"       >>> source('/tmp/t.wav', samplerate = 0)\n"
41"\n"
42"   __call__()\n"
43"       vec, read = x() <==> vec, read = x.do()\n"
44"\n"
45"       Read vector from source.\n"
46"\n"
47"       See also\n"
48"       --------\n"
49"       aubio.source.do\n"
50"\n";
51
52static char Py_source_get_samplerate_doc[] = ""
53"x.get_samplerate() -> source samplerate\n"
54"\n"
55"Get samplerate of source.";
56
57static char Py_source_get_channels_doc[] = ""
58"x.get_channels() -> number of channels\n"
59"\n"
60"Get number of channels in source.";
61
62static char Py_source_do_doc[] = ""
63"vec, read = x.do() <==> vec, read = x()\n"
64"\n"
65"Read monophonic vector from source.";
66
67static char Py_source_do_multi_doc[] = ""
68"mat, read = x.do_multi()\n"
69"\n"
70"Read polyphonic vector from source.";
71
72static char Py_source_close_doc[] = ""
73"x.close()\n"
74"\n"
75"Close this source now.";
76
77static char Py_source_seek_doc[] = ""
78"x.seek(position)\n"
79"\n"
80"Seek to resampled frame position.";
81
82static PyObject *
83Py_source_new (PyTypeObject * pytype, PyObject * args, PyObject * kwds)
84{
85  Py_source *self;
86  char_t* uri = NULL;
87  uint_t samplerate = 0;
88  uint_t hop_size = 0;
89  uint_t channels = 0;
90  static char *kwlist[] = { "uri", "samplerate", "hop_size", "channels", NULL };
91
92  if (!PyArg_ParseTupleAndKeywords (args, kwds, "|sIII", kwlist,
93          &uri, &samplerate, &hop_size, &channels)) {
94    return NULL;
95  }
96
97  self = (Py_source *) pytype->tp_alloc (pytype, 0);
98
99  if (self == NULL) {
100    return NULL;
101  }
102
103  self->uri = NULL;
104  if (uri != NULL) {
105    self->uri = (char_t *)malloc(sizeof(char_t) * (strnlen(uri, PATH_MAX) + 1));
106    strncpy(self->uri, uri, strnlen(uri, PATH_MAX) + 1);
107  }
108
109  self->samplerate = 0;
110  if ((sint_t)samplerate > 0) {
111    self->samplerate = samplerate;
112  } else if ((sint_t)samplerate < 0) {
113    PyErr_SetString (PyExc_ValueError,
114        "can not use negative value for samplerate");
115    return NULL;
116  }
117
118  self->hop_size = Py_default_vector_length / 2;
119  if ((sint_t)hop_size > 0) {
120    self->hop_size = hop_size;
121  } else if ((sint_t)hop_size < 0) {
122    PyErr_SetString (PyExc_ValueError,
123        "can not use negative value for hop_size");
124    return NULL;
125  }
126
127  self->channels = 1;
128  if ((sint_t)channels >= 0) {
129    self->channels = channels;
130  } else if ((sint_t)channels < 0) {
131    PyErr_SetString (PyExc_ValueError,
132        "can not use negative value for channels");
133    return NULL;
134  }
135
136  return (PyObject *) self;
137}
138
139static int
140Py_source_init (Py_source * self, PyObject * args, PyObject * kwds)
141{
142  self->o = new_aubio_source ( self->uri, self->samplerate, self->hop_size );
143  if (self->o == NULL) {
144    // PyErr_Format(PyExc_RuntimeError, ...) was set above by new_ which called
145    // AUBIO_ERR when failing
146    return -1;
147  }
148  self->samplerate = aubio_source_get_samplerate ( self->o );
149  if (self->channels == 0) {
150    self->channels = aubio_source_get_channels ( self->o );
151  }
152  self->duration = aubio_source_get_duration ( self->o );
153
154  self->read_to = new_py_fvec(self->hop_size);
155  self->mread_to = new_py_fmat(self->channels, self->hop_size);
156
157  return 0;
158}
159
160static void
161Py_source_del (Py_source *self, PyObject *unused)
162{
163  if (self->o) {
164    del_aubio_source(self->o);
165    free(self->c_mread_to.data);
166  }
167  Py_XDECREF(self->read_to);
168  Py_XDECREF(self->mread_to);
169  Py_TYPE(self)->tp_free((PyObject *) self);
170}
171
172
173/* function Py_source_do */
174static PyObject *
175Py_source_do(Py_source * self, PyObject * args)
176{
177  PyObject *outputs;
178  uint_t read;
179  read = 0;
180
181  Py_INCREF(self->read_to);
182  if (!PyAubio_ArrayToCFvec(self->read_to, &(self->c_read_to))) {
183    return NULL;
184  }
185  /* compute _do function */
186  aubio_source_do (self->o, &(self->c_read_to), &read);
187
188  outputs = PyTuple_New(2);
189  PyTuple_SetItem( outputs, 0, self->read_to );
190  PyTuple_SetItem( outputs, 1, (PyObject *)PyLong_FromLong(read));
191  return outputs;
192}
193
194/* function Py_source_do_multi */
195static PyObject *
196Py_source_do_multi(Py_source * self, PyObject * args)
197{
198  PyObject *outputs;
199  uint_t read;
200  read = 0;
201
202  Py_INCREF(self->mread_to);
203  if (!PyAubio_ArrayToCFmat(self->mread_to,  &(self->c_mread_to))) {
204    return NULL;
205  }
206  /* compute _do function */
207  aubio_source_do_multi (self->o, &(self->c_mread_to), &read);
208
209  outputs = PyTuple_New(2);
210  PyTuple_SetItem( outputs, 0, self->mread_to);
211  PyTuple_SetItem( outputs, 1, (PyObject *)PyLong_FromLong(read));
212  return outputs;
213}
214
215static PyMemberDef Py_source_members[] = {
216  {"uri", T_STRING, offsetof (Py_source, uri), READONLY,
217    "path at which the source was created"},
218  {"samplerate", T_INT, offsetof (Py_source, samplerate), READONLY,
219    "samplerate at which the source is viewed"},
220  {"channels", T_INT, offsetof (Py_source, channels), READONLY,
221    "number of channels found in the source"},
222  {"hop_size", T_INT, offsetof (Py_source, hop_size), READONLY,
223    "number of consecutive frames that will be read at each do or do_multi call"},
224  {"duration", T_INT, offsetof (Py_source, duration), READONLY,
225    "total number of frames in the source (estimated)"},
226  { NULL } // sentinel
227};
228
229static PyObject *
230Pyaubio_source_get_samplerate (Py_source *self, PyObject *unused)
231{
232  uint_t tmp = aubio_source_get_samplerate (self->o);
233  return (PyObject *)PyLong_FromLong (tmp);
234}
235
236static PyObject *
237Pyaubio_source_get_channels (Py_source *self, PyObject *unused)
238{
239  uint_t tmp = aubio_source_get_channels (self->o);
240  return (PyObject *)PyLong_FromLong (tmp);
241}
242
243static PyObject *
244Pyaubio_source_close (Py_source *self, PyObject *unused)
245{
246  if (aubio_source_close(self->o) != 0) return NULL;
247  Py_RETURN_NONE;
248}
249
250static PyObject *
251Pyaubio_source_seek (Py_source *self, PyObject *args)
252{
253  uint_t err = 0;
254
255  int position;
256  if (!PyArg_ParseTuple (args, "I", &position)) {
257    return NULL;
258  }
259
260  if (position < 0) {
261    PyErr_Format(PyExc_ValueError,
262        "error when seeking in source: can not seek to negative value %d",
263        position);
264    return NULL;
265  }
266
267  err = aubio_source_seek(self->o, position);
268  if (err != 0) {
269    PyErr_SetString (PyExc_ValueError,
270        "error when seeking in source");
271    return NULL;
272  }
273  Py_RETURN_NONE;
274}
275
276static char Pyaubio_source_enter_doc[] = "";
277static PyObject* Pyaubio_source_enter(Py_source *self, PyObject *unused) {
278  Py_INCREF(self);
279  return (PyObject*)self;
280}
281
282static char Pyaubio_source_exit_doc[] = "";
283static PyObject* Pyaubio_source_exit(Py_source *self, PyObject *unused) {
284  return Pyaubio_source_close(self, unused);
285}
286
287static PyObject* Pyaubio_source_iter(PyObject *self) {
288  Py_INCREF(self);
289  return (PyObject*)self;
290}
291
292static PyObject* Pyaubio_source_iter_next(Py_source *self) {
293  PyObject *done, *size;
294  if (self->channels == 1) {
295    done = Py_source_do(self, NULL);
296  } else {
297    done = Py_source_do_multi(self, NULL);
298  }
299  if (!PyTuple_Check(done)) {
300    PyErr_Format(PyExc_ValueError,
301        "error when reading source: not opened?");
302    return NULL;
303  }
304  size = PyTuple_GetItem(done, 1);
305  if (size != NULL && PyLong_Check(size)) {
306    if (PyLong_AsLong(size) == (long)self->hop_size) {
307      PyObject *vec = PyTuple_GetItem(done, 0);
308      return vec;
309    } else if (PyLong_AsLong(size) > 0) {
310      // short read
311      PyArrayObject *shortread = (PyArrayObject*)PyTuple_GetItem(done, 0);
312      PyArray_Dims newdims;
313      newdims.len = PyArray_NDIM(shortread);
314      newdims.ptr = PyArray_DIMS(shortread);
315      // mono or multiple channels?
316      if (newdims.len == 1) {
317        newdims.ptr[0] = PyLong_AsLong(size);
318      } else {
319        newdims.ptr[1] = PyLong_AsLong(size);
320      }
321      PyArray_Resize(shortread, &newdims, 1, NPY_ANYORDER);
322      return (PyObject*)shortread;
323    } else {
324      PyErr_SetNone(PyExc_StopIteration);
325      return NULL;
326    }
327  } else {
328    PyErr_SetNone(PyExc_StopIteration);
329    return NULL;
330  }
331}
332
333static PyMethodDef Py_source_methods[] = {
334  {"get_samplerate", (PyCFunction) Pyaubio_source_get_samplerate,
335    METH_NOARGS, Py_source_get_samplerate_doc},
336  {"get_channels", (PyCFunction) Pyaubio_source_get_channels,
337    METH_NOARGS, Py_source_get_channels_doc},
338  {"do", (PyCFunction) Py_source_do,
339    METH_NOARGS, Py_source_do_doc},
340  {"do_multi", (PyCFunction) Py_source_do_multi,
341    METH_NOARGS, Py_source_do_multi_doc},
342  {"close", (PyCFunction) Pyaubio_source_close,
343    METH_NOARGS, Py_source_close_doc},
344  {"seek", (PyCFunction) Pyaubio_source_seek,
345    METH_VARARGS, Py_source_seek_doc},
346  {"__enter__", (PyCFunction)Pyaubio_source_enter, METH_NOARGS,
347    Pyaubio_source_enter_doc},
348  {"__exit__",  (PyCFunction)Pyaubio_source_exit, METH_VARARGS,
349    Pyaubio_source_exit_doc},
350  {NULL} /* sentinel */
351};
352
353PyTypeObject Py_sourceType = {
354  PyVarObject_HEAD_INIT (NULL, 0)
355  "aubio.source",
356  sizeof (Py_source),
357  0,
358  (destructor) Py_source_del,
359  0,
360  0,
361  0,
362  0,
363  0,
364  0,
365  0,
366  0,
367  0,
368  (ternaryfunc)Py_source_do,
369  0,
370  0,
371  0,
372  0,
373  Py_TPFLAGS_DEFAULT,
374  Py_source_doc,
375  0,
376  0,
377  0,
378  0,
379  Pyaubio_source_iter,
380  (unaryfunc)Pyaubio_source_iter_next,
381  Py_source_methods,
382  Py_source_members,
383  0,
384  0,
385  0,
386  0,
387  0,
388  0,
389  (initproc) Py_source_init,
390  0,
391  Py_source_new,
392  0,
393  0,
394  0,
395  0,
396  0,
397  0,
398  0,
399  0,
400  0,
401};
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