static PyObject *
Pyaubio_source_seek (Py_source *self, PyObject *args)
{
uint_t err = 0;
int position;
if (!PyArg_ParseTuple (args, "I", &position)) {
return NULL;
}
if (position < 0) {
PyErr_Format(PyExc_ValueError,
"error when seeking in source: can not seek to negative value %d",
position);
return NULL;
}
err = aubio_source_seek(self->o, position);
if (err != 0) {
PyErr_SetString (PyExc_ValueError,
"error when seeking in source");
return NULL;
}
Py_RETURN_NONE;
}
uint_t aubio_sampler_play ( aubio_sampler_t * o )
{
aubio_source_seek (o->source, 0);
return aubio_sampler_set_playing (o, 1);
}
int main (int argc, char **argv)
{
uint_t err = 0;
if (argc < 2) {
err = 2;
PRINT_ERR("not enough arguments\n");
PRINT_MSG("read a wave file as a mono vector\n");
PRINT_MSG("usage: %s <source_path> [samplerate] [hop_size]\n", argv[0]);
PRINT_MSG("examples:\n");
PRINT_MSG(" - read file.wav at original samplerate\n");
PRINT_MSG(" %s file.wav\n", argv[0]);
PRINT_MSG(" - read file.wav at 32000Hz\n");
PRINT_MSG(" %s file.aif 32000\n", argv[0]);
PRINT_MSG(" - read file.wav at original samplerate with 4096 blocks\n");
PRINT_MSG(" %s file.wav 0 4096 \n", argv[0]);
return err;
}
uint_t samplerate = 0;
uint_t hop_size = 256;
uint_t n_frames = 0, read = 0;
uint_t old_n_frames_1 = 0, old_n_frames_2 = 0, old_n_frames_3 = 0;
if ( argc == 3 ) samplerate = atoi(argv[2]);
if ( argc == 4 ) hop_size = atoi(argv[3]);
char_t *source_path = argv[1];
fvec_t *vec = new_fvec(hop_size);
aubio_source_t* s = new_aubio_source(source_path, samplerate, hop_size);
if (!s) {
err = 1;
goto beach;
}
if (samplerate == 0 ) samplerate = aubio_source_get_samplerate(s);
do {
aubio_source_do(s, vec, &read);
//fvec_print (vec);
n_frames += read;
} while ( read == hop_size );
PRINT_MSG("read %.2fs, %d frames at %dHz (%d blocks) from %s\n",
n_frames * 1. / samplerate,
n_frames, samplerate,
n_frames / hop_size, source_path);
old_n_frames_1 = n_frames;
aubio_source_seek (s, 0);
n_frames = 0;
do {
aubio_source_do(s, vec, &read);
//fvec_print (vec);
n_frames += read;
} while ( read == hop_size );
PRINT_MSG("read %.2fs, %d frames at %dHz (%d blocks) from %s\n",
n_frames * 1. / samplerate,
n_frames, samplerate,
n_frames / hop_size, source_path);
old_n_frames_2 = n_frames;
aubio_source_seek (s, old_n_frames_1 / 2);
n_frames = 0;
do {
aubio_source_do(s, vec, &read);
//fvec_print (vec);
n_frames += read;
} while ( read == hop_size );
PRINT_MSG("read %.2fs, %d frames at %dHz (%d blocks) from %s\n",
n_frames * 1. / samplerate,
n_frames, samplerate,
n_frames / hop_size, source_path);
old_n_frames_3 = n_frames;
del_aubio_source (s);
beach:
del_fvec (vec);
// check that we got exactly the same number of frames
assert ( old_n_frames_2 == old_n_frames_1 );
// check that we got about half the frames, with 3 decimals
assert ( roundf(1.e3 * old_n_frames_1 / old_n_frames_3) / 1.e3 == 2.);
return err;
}