static PyObject* cAction_crossfade(PyObject* self, PyObject* args)
{
PyObject *objInSound1, *objInSound2;
char* s_mode = NULL;
// Hacky - the percentage through the crossfade that we're processing.
// Allows for incremental processing of the same crossfade in chunks.
long total = -1;
long offset = 0;
if (!PyArg_ParseTuple(args, "OO|sll", &objInSound1, &objInSound2, &s_mode, &total, &offset))
return NULL;
PyArrayObject *inSound1 = get_pyarray(objInSound1);
if (inSound1 == NULL)
return NULL;
PyArrayObject *inSound2 = get_pyarray(objInSound2);
if (inSound2 == NULL)
{
Py_XDECREF(inSound1);
return NULL;
}
float* inSamples1 = (float *)inSound1->data;
float* inSamples2 = (float *)inSound2->data;
uint numInSamples = inSound1->dimensions[0];
uint numInChannels = inSound1->dimensions[1];
npy_intp dims[DIMENSIONS];
dims[0] = numInSamples;
dims[1] = numInChannels;
if ( total < 0 ) {
total = numInSamples;
}
// Allocate interlaced memory for output sound object
PyArrayObject* outSound = (PyArrayObject *)PyArray_SimpleNew(DIMENSIONS, dims, NPY_FLOAT);
// Get the actual array
float* outSamples = (float *)outSound->data;
// Figure out which crossfade to use.
float (*fader)(float, float, long, long) = strcmp(s_mode, "linear") == 0 ? linear : equal_power;
for (uint i = 0; i < numInChannels; i++)
{
for (uint j = 0; j < numInSamples; j++)
{
uint index = i + j*numInChannels;
outSamples[index] = fader(inSamples1[index], inSamples2[index], (j + offset > total ? total : j + offset), total);
}
}
Py_DECREF(inSound1);
Py_DECREF(inSound2);
return PyArray_Return(outSound);
}
static PyObject* cAction_limit(PyObject* self, PyObject* args)
{
PyObject *objInSound;
if (!PyArg_ParseTuple(args, "O", &objInSound))
return NULL;
PyArrayObject *inSound = get_pyarray(objInSound);
if (inSound == NULL)
return NULL;
uint nSamples = inSound->dimensions[0];
uint nChannels = inSound->dimensions[1];
// float *inSamples = (Float32 *)NA_OFFSETDATA(inSound);
float *inSamples = (float*) PyArray_DATA(inSound);
// Limit:
for (uint j = 0; j < nChannels; j++)
{
for (uint i = 0; i < nSamples; i++)
{
float f = inSamples[nChannels*i + j];
inSamples[nChannels*i + j] = limiter(f);
}
}
// Do we need to make a copy before returning, or can we return the modified original?
return PyArray_Return(inSound);
}
static PyObject* cAction_fade(PyObject* self, PyObject* args)
{
PyObject *objInSound;
float volume = 1.0f;
float from = 0.0f;
float to = 1.0f;
if (!PyArg_ParseTuple(args, "O|f|f|f", &objInSound, &volume, &from, &to))
return NULL;
PyArrayObject *inSound = get_pyarray(objInSound);
if (inSound == NULL)
return NULL;
uint nSamples = inSound->dimensions[0];
uint nChannels = inSound->dimensions[1];
// float *inSamples = (Float32 *)NA_OFFSETDATA(inSound);
float *inSamples = (float*) PyArray_DATA(inSound);
// Limit:
for (uint j = 0; j < nChannels; j++)
{
for (uint i = 0; i < nSamples; i++)
{
float frac = ((float)(nSamples - i) / (float) nSamples) * (to - from) + from;
float f = inSamples[nChannels * i + j];
inSamples[nChannels * i + j] = limiter(frac * f * volume);
}
}
// Do we need to make a copy before returning, or can we return the modified original?
return PyArray_Return(inSound);
}
static PyObject* cAction_crossfade(PyObject* self, PyObject* args)
{
PyObject *objInSound1, *objInSound2;
char* s_mode = NULL;
if (!PyArg_ParseTuple(args, "OO|s", &objInSound1, &objInSound2, &s_mode))
return NULL;
PyArrayObject *inSound1 = get_pyarray(objInSound1);
if (inSound1 == NULL)
return NULL;
PyArrayObject *inSound2 = get_pyarray(objInSound2);
if (inSound2 == NULL)
{
Py_XDECREF(inSound1);
return NULL;
}
float* inSamples1 = (float *)inSound1->data;
float* inSamples2 = (float *)inSound2->data;
uint numInSamples = inSound1->dimensions[0];
uint numInChannels = inSound1->dimensions[1];
npy_intp dims[DIMENSIONS];
dims[0] = numInSamples;
dims[1] = numInChannels;
// Allocate interlaced memory for output sound object
PyArrayObject* outSound = (PyArrayObject *)PyArray_SimpleNew(DIMENSIONS, dims, NPY_FLOAT);
// Get the actual array
float* outSamples = (float *)outSound->data;
// Figure out which crossfade to use.
float (*fader)(float, float, long, long) = strcmp(s_mode, "linear") == 0 ? linear : equal_power;
for (uint i = 0; i < numInChannels; i++)
{
for (uint j = 0; j < numInSamples; j++)
{
uint index = i + j*numInChannels;
outSamples[index] = fader(inSamples1[index], inSamples2[index], j, numInSamples);
}
}
return PyArray_Return(outSound);
}
