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/*
py/pyext - python script object for PD and Max/MSP
Copyright (c)2002-2005 Thomas Grill (gr@grrrr.org)
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "license.txt," in this distribution.
*/
#include "pyext.h"
class pydsp
: public pyext
{
FLEXT_HEADER(pydsp,pyext)
public:
pydsp(int argc,const t_atom *argv);
protected:
virtual bool CbDsp();
virtual void CbSignal();
virtual bool DoInit();
virtual void DoExit();
virtual PyObject *GetSig(int ix,bool in);
void NewBuffers();
void FreeBuffers();
PyObject *dspfun,*sigfun;
PyObject **buffers;
};
FLEXT_LIB_DSP_V("pyext~ pyext.~ pyx~ pyx.~",pydsp)
pydsp::pydsp(int argc,const t_atom *argv)
: pyext(argc,argv,true)
, dspfun(NULL),sigfun(NULL)
{}
bool pydsp::DoInit()
{
if(!pyext::DoInit()) return false;
if(pyobj)
{
dspfun = PyObject_GetAttrString(pyobj,"_dsp"); // get ref
if(!dspfun)
PyErr_Clear();
else if(!PyMethod_Check(dspfun)) {
Py_DECREF(dspfun);
dspfun = NULL;
}
}
return true;
}
void pydsp::DoExit()
{
if(dspfun) { Py_DECREF(dspfun); dspfun = NULL; }
if(sigfun) { Py_DECREF(sigfun); sigfun = NULL; }
FreeBuffers();
}
PyObject *arrayfrombuffer(PyObject *buf,int c,int n);
void pydsp::NewBuffers()
{
int i,n = Blocksize();
const int ins = CntInSig(),outs = CntOutSig();
t_sample *const *insigs = InSig();
t_sample *const *outsigs = OutSig();
// inlet/outlet count can't change so we don't have to deallocate
if(!buffers) {
int cnt = ins+outs;
buffers = new PyObject *[cnt];
memset(buffers,0,cnt*sizeof(*buffers));
}
for(i = 0; i < ins; ++i) {
Py_XDECREF(buffers[i]);
PyObject *b = PyBuffer_FromReadWriteMemory(insigs[i],n*sizeof(t_sample));
buffers[i] = arrayfrombuffer(b,1,n);
Py_DECREF(b);
}
for(i = 0; i < outs; ++i) {
Py_XDECREF(buffers[ins+i]);
if(i < ins && outsigs[i] == insigs[i]) {
// same vectors - share the objects!
buffers[ins+i] = buffers[i];
Py_XINCREF(buffers[i]);
}
else {
PyObject *b = PyBuffer_FromReadWriteMemory(outsigs[i],n*sizeof(t_sample));
buffers[ins+i] = arrayfrombuffer(b,1,n);
Py_DECREF(b);
}
}
}
void pydsp::FreeBuffers()
{
if(buffers) {
int cnt = CntInSig()+CntOutSig();
for(int i = 0; i < cnt; ++i) Py_XDECREF(buffers[i]);
delete[] buffers;
buffers = NULL;
}
}
bool pydsp::CbDsp()
{
if(pyobj && (CntInSig() || CntOutSig()))
{
PyThreadState *state = PyLockSys();
NewBuffers();
bool dodsp = true;
if(dspfun) {
PyObject *ret = PyObject_CallObject(dspfun,NULL);
if(ret) {
dodsp = PyObject_IsTrue(ret);
Py_DECREF(ret);
}
else {
#ifdef FLEXT_DEBUG
PyErr_Print();
#else
PyErr_Clear();
#endif
}
}
// do that here instead of where dspfun is initialized, so that
// _signal can be assigned in _dsp
// optimizations may be done there to assign the right _signal version
Py_XDECREF(sigfun);
if(dodsp) {
sigfun = PyObject_GetAttrString(pyobj,"_signal"); // get ref
if(!sigfun)
PyErr_Clear();
else if(!PyMethod_Check(sigfun)) {
Py_DECREF(sigfun);
sigfun = NULL;
}
}
else
sigfun = NULL;
PyUnlock(state);
return sigfun != NULL;
}
else
// switch on dsp only if there are signal inlets or outlets
return false;
}
void pydsp::CbSignal()
{
PyThreadState *state = PyLockSys();
PyObject *ret = PyObject_CallObject(sigfun,NULL);
if(ret)
Py_DECREF(ret);
else {
#ifdef FLEXT_DEBUG
PyErr_Print();
#else
PyErr_Clear();
#endif
}
PyUnlock(state);
}
PyObject *pydsp::GetSig(int ix,bool in)
{
PyObject *r = buffers[in?ix:CntInSig()+ix];
Py_XINCREF(r);
return r;
}
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