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/******************************************************************************
*
* Copyright 2022 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
#include <Python.h>
#include <numpy/ndarrayobject.h>
#include <ltpf.c>
#include "ctypes.h"
static PyObject *resample_py(PyObject *m, PyObject *args)
{
unsigned dt, sr;
PyObject *hp50_obj, *x_obj, *y_obj;
struct lc3_ltpf_hp50_state hp50;
int16_t *x, *y;
if (!PyArg_ParseTuple(args, "IIOOO", &dt, &sr, &hp50_obj, &x_obj, &y_obj))
return NULL;
CTYPES_CHECK("dt", (unsigned)dt < LC3_NUM_DT);
CTYPES_CHECK("sr", (unsigned)sr < LC3_NUM_SRATE);
CTYPES_CHECK(NULL, hp50_obj = to_ltpf_hp50_state(hp50_obj, &hp50));
int ns = LC3_NS(dt, sr), nt = LC3_NT(dt);
int ny = sizeof((struct lc3_ltpf_analysis){ }.x_12k8) / sizeof(int16_t);
int n = dt == LC3_DT_7M5 ? 96 : 128;
CTYPES_CHECK("x", x_obj = to_1d_ptr(x_obj, NPY_INT16, ns+nt, &x));
CTYPES_CHECK("y", y_obj = to_1d_ptr(y_obj, NPY_INT16, ny, &y));
resample_12k8[sr](&hp50, x + nt, y + (ny - n), n);
from_ltpf_hp50_state(hp50_obj, &hp50);
return Py_BuildValue("O", y_obj);
}
static PyObject *analyse_py(PyObject *m, PyObject *args)
{
PyObject *ltpf_obj, *x_obj;
unsigned dt, sr;
struct lc3_ltpf_analysis ltpf;
struct lc3_ltpf_data data = { 0 };
int16_t *x;
if (!PyArg_ParseTuple(args, "IIOO", &dt, &sr, <pf_obj, &x_obj))
return NULL;
CTYPES_CHECK("dt", dt < LC3_NUM_DT);
CTYPES_CHECK("sr", sr < LC3_NUM_SRATE);
CTYPES_CHECK(NULL, ltpf_obj = to_ltpf_analysis(ltpf_obj, <pf));
int ns = LC3_NS(dt, sr), nt = LC3_NT(sr);
CTYPES_CHECK("x", x_obj = to_1d_ptr(x_obj, NPY_INT16, ns+nt, &x));
int pitch_present =
lc3_ltpf_analyse(dt, sr, <pf, x + nt, &data);
from_ltpf_analysis(ltpf_obj, <pf);
return Py_BuildValue("iN", pitch_present, new_ltpf_data(&data));
}
static PyObject *synthesize_py(PyObject *m, PyObject *args)
{
PyObject *ltpf_obj, *data_obj, *x_obj;
struct lc3_ltpf_synthesis ltpf;
struct lc3_ltpf_data data;
bool pitch_present;
unsigned dt, sr;
int nbytes;
float *x;
if (!PyArg_ParseTuple(args, "IIiOOO",
&dt, &sr, &nbytes, <pf_obj, &data_obj, &x_obj))
return NULL;
CTYPES_CHECK("dt", dt < LC3_NUM_DT);
CTYPES_CHECK("sr", sr < LC3_NUM_SRATE);
CTYPES_CHECK("nbytes", nbytes >= 20 && nbytes <= 400);
CTYPES_CHECK(NULL, ltpf_obj = to_ltpf_synthesis(ltpf_obj, <pf));
if ((pitch_present = (data_obj != Py_None)))
CTYPES_CHECK(NULL, data_obj = to_ltpf_data(data_obj, &data));
int ns = LC3_NS(dt,sr), nd = 18 * LC3_SRATE_KHZ(sr);
CTYPES_CHECK("x", x_obj = to_1d_ptr(x_obj, NPY_FLOAT, nd+ns, &x));
lc3_ltpf_synthesize(dt, sr, nbytes,
<pf, pitch_present ? &data : NULL, x, x + nd);
from_ltpf_synthesis(ltpf_obj, <pf);
return Py_BuildValue("O", x_obj);
}
static PyObject *get_nbits_py(PyObject *m, PyObject *args)
{
int pitch_present;
if (!PyArg_ParseTuple(args, "i", &pitch_present))
return NULL;
int nbits = lc3_ltpf_get_nbits(pitch_present);
return Py_BuildValue("i", nbits);
}
static PyMethodDef methods[] = {
{ "ltpf_resample" , resample_py , METH_VARARGS },
{ "ltpf_analyse" , analyse_py , METH_VARARGS },
{ "ltpf_synthesize", synthesize_py, METH_VARARGS },
{ "ltpf_get_nbits" , get_nbits_py , METH_VARARGS },
{ NULL },
};
PyMODINIT_FUNC lc3_ltpf_py_init(PyObject *m)
{
import_array();
PyModule_AddFunctions(m, methods);
return m;
}
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