annotate host/pyRealTime.cpp @ 20:812fbde7eca5

* Don't even try to preload on Windows

/*

This module exposes a Type Object wrapping VAMP::RealTime
together with module level functions to create 
new pyRealTime objects from frame count, samplerate or sec,nsec tuples.

A small API is provided for the C/C++ programmer and relevant
functions are exposed to Python.

TODO: implement number protocol (i.e. wrap arithmetic operators) 
partly done

*/

#include <Python.h>
#include <pyRealTime.h>
#include "vamp-sdk/Plugin.h"
#include <string>

using namespace std;
using namespace Vamp;

using Vamp::Plugin;
using Vamp::RealTime;

/*						REAL-TIME TYPE OBJECT						*/


/* Documentation for our new module */
PyDoc_STRVAR(module_doc,
"This module is a thin wrapper around VAMP::RealTime.");


/*					 RealTime Object's Methods 					*/ 
//Note: these are internals, not exposed by the module but the object

/* Returns a Tuple containing sec and nsec values */
static PyObject *
RealTime_values(RealTimeObject *self)
{
	return Py_BuildValue("(ii)",
	self->rt->sec,self->rt->nsec);
}

/* Returns a Text representation */
static PyObject *
RealTime_toText(RealTimeObject *self, PyObject *args)
{
	return Py_BuildValue("s",
	self->rt->toText().c_str());
}

/* String representation called by e.g. str(realtime), print realtime*/
static PyObject *
RealTime_repr(PyObject *self)
{
	return Py_BuildValue("s",
	((RealTimeObject*)self)->rt->toString().c_str());
}


/* Frame representation */
static PyObject *
RealTime_toFrame(PyObject *self, PyObject *args)
{
	unsigned int samplerate;
	
	if ( !PyArg_ParseTuple(args, "I:realtime.toFrame object ", 
	(unsigned int *) &samplerate )) {
		PyErr_SetString(PyExc_ValueError, 
		"Sample Rate Required.");
		return NULL;
	}
	
	return Py_BuildValue("k", 
	RealTime::realTime2Frame( 
	*(const RealTime*) ((RealTimeObject*)self)->rt, 
	(unsigned int) samplerate));
}

/* Conversion of realtime to a double precision floating point value */
/* ...in Python called by e.g. float(realtime) */
static PyObject *
RealTime_float(PyObject *s)
{
	double drt = ((double) ((RealTimeObject*)s)->rt->sec + 
	(double)((double) ((RealTimeObject*)s)->rt->nsec)/1000000000);
	return PyFloat_FromDouble(drt);	
}

/* test */
static PyObject *
RealTime_test(PyObject *self)
{

	long frame = 100;
	unsigned int sampleRate = 22050;
	
	const RealTime t = RealTime::frame2RealTime(frame,sampleRate);
	long back = RealTime::realTime2Frame(t,sampleRate);
	cerr << "Reverse Conversion: " << back << endl;

	return Py_BuildValue("s",
	((RealTimeObject*)self)->rt->toString().c_str());
}


/* Type object's (RealTime) methods table */
static PyMethodDef RealTime_methods[] = {

	{"toText",	(PyCFunction)RealTime_toText,	METH_NOARGS,
		PyDoc_STR("toText() -> Return a user-readable string to the nearest millisecond in a form like HH:MM:SS.mmm")},

	{"values",	(PyCFunction)RealTime_values,	METH_NOARGS,
		PyDoc_STR("values() -> Tuple of sec,nsec representation.")},

	{"toFrame",	(PyCFunction)RealTime_toFrame,	METH_VARARGS,
		PyDoc_STR("frame(samplerate) -> Sample count for given sample rate.")},

	{"toFloat",	(PyCFunction)RealTime_float,	METH_NOARGS,
		PyDoc_STR("float() -> Floating point representation.")},

	{"test",	(PyCFunction)RealTime_test,	METH_VARARGS,
		PyDoc_STR("test() -> .")},
	
	{NULL,		NULL}		/* sentinel */
};



/* Function to set basic attributes */
static int
RealTime_setattr(RealTimeObject *self, char *name, PyObject *value)
{

	if ( !string(name).compare("sec")) { 
		self->rt->sec= (int) PyInt_AS_LONG(value);
		return 0;
	}

	if ( !string(name).compare("nsec")) { 
		self->rt->nsec= (int) PyInt_AS_LONG(value);
		return 0;
	}

	return -1;
}

/* Function to get basic attributes */
static PyObject *
RealTime_getattr(RealTimeObject *self, char *name)
{

	if ( !string(name).compare("sec") ) { 
		return PyInt_FromSsize_t(
		(Py_ssize_t) self->rt->sec); 
	} 

	if ( !string(name).compare("nsec") ) { 
		return PyInt_FromSsize_t(
		(Py_ssize_t) self->rt->nsec); 
	} 

	return Py_FindMethod(RealTime_methods, 
	(PyObject *)self, name);
}


/* DESTRUCTOR: delete type object */
static void
RealTimeObject_dealloc(RealTimeObject *self)
{
	delete self->rt; 	//delete the C object
	PyObject_Del(self); //delete the Python object
}

/*					 Number Protocol 					*/


static PyObject *
RealTime_add(PyObject *s, PyObject *w)
{

	RealTimeObject *result = 
    PyObject_New(RealTimeObject, &RealTime_Type); 
	if (result == NULL) return NULL;

	result->rt = new RealTime::RealTime(
	*((RealTimeObject*)s)->rt + *((RealTimeObject*)w)->rt);
	return (PyObject*)result;
}

static PyObject *
RealTime_subtract(PyObject *s, PyObject *w)
{

	RealTimeObject *result = 
    PyObject_New(RealTimeObject, &RealTime_Type); 
	if (result == NULL) return NULL;

	result->rt = new RealTime::RealTime(
	*((RealTimeObject*)s)->rt - *((RealTimeObject*)w)->rt);
	return (PyObject*)result;
}


static PyNumberMethods realtime_as_number = {
	RealTime_add,			/*nb_add*/
	RealTime_subtract,		/*nb_subtract*/
	0,						/*nb_multiply*/
	0,				 		/*nb_divide*/
    0,						/*nb_remainder*/
    0,      	            /*nb_divmod*/
    0,                   	/*nb_power*/
    0,                  	/*nb_neg*/
    0,                		/*nb_pos*/
    0,                  	/*(unaryfunc)array_abs,*/
    0,                    	/*nb_nonzero*/
    0,                    	/*nb_invert*/
    0,       				/*nb_lshift*/
    0,      				/*nb_rshift*/
    0,      				/*nb_and*/
    0,      				/*nb_xor*/
    0,       				/*nb_or*/
    0,                      /*nb_coerce*/
    0,						/*nb_int*/
    0,				        /*nb_long*/
    (unaryfunc)RealTime_float,             /*nb_float*/
    0,               		/*nb_oct*/
    0,               		/*nb_hex*/
};

/*					 pyRealTime TypeObject 					*/


/* Doc:: 10.3 Type Objects */
/* static */ PyTypeObject RealTime_Type = {
	/* The ob_type field must be initialized in the module init function
	 * to be portable to Windows without using C++. */
	PyObject_HEAD_INIT(NULL)
	0,						/*ob_size*/
	"pyRealTime.realtime",				/*tp_name*/
	sizeof(RealTimeObject),	/*tp_basicsize*/
	sizeof(RealTime),		/*tp_itemsize*/
	/*	 	methods	 	*/
	(destructor)RealTimeObject_dealloc, /*tp_dealloc*/
	0,						/*tp_print*/
	(getattrfunc)RealTime_getattr, /*tp_getattr*/
	(setattrfunc)RealTime_setattr, /*tp_setattr*/
	0,						/*tp_compare*/
	RealTime_repr,			/*tp_repr*/
	&realtime_as_number,	/*tp_as_number*/
	0,						/*tp_as_sequence*/
	0,						/*tp_as_mapping*/
	0,						/*tp_hash*/
	0,//(ternaryfunc)RealTime_new,                      /*tp_call*/
    0,                      /*tp_str*/
    0,                      /*tp_getattro*/
    0,                      /*tp_setattro*/
    0,                      /*tp_as_buffer*/
    Py_TPFLAGS_DEFAULT,     /*tp_flags*/
    0,                      /*tp_doc*/
    0,                      /*tp_traverse*/
    0,                      /*tp_clear*/
    0,                      /*tp_richcompare*/
    0,                      /*tp_weaklistoffset*/
    0,                      /*tp_iter*/
    0,                      /*tp_iternext*/
    RealTime_methods,       /*tp_methods*/ //TypeObject Methods
    0,                      /*tp_members*/
    0,                      /*tp_getset*/
    0,                      /*tp_base*/
    0,                      /*tp_dict*/
    0,                      /*tp_descr_get*/
    0,                      /*tp_descr_set*/
    0,                      /*tp_dictoffset*/
    0,                      /*tp_init*/
    0,                      /*tp_alloc*/
    0,                      /*tp_new*/
    0,			            /*tp_free*/
    0,                      /*tp_is_gc*/
};


/*		 Remaining Functions Exposed by the MODULE 					*/


/* New RealTime object from Frame (with given samplerate) */
/*static*/ PyObject *
RealTime_frame2RealTime(PyObject *ignored, PyObject *args)
{

	long frame;
	unsigned int sampleRate;

	if (!PyArg_ParseTuple(args, "lI:realtime.fame2RealTime ", 
	&frame, 
	&sampleRate))
		return NULL;
	/*Doc:: 5.5 Parsing arguments and building values*/

	RealTimeObject *self;
	self = PyObject_New(RealTimeObject, &RealTime_Type); 
	if (self == NULL)
		return NULL;

	self->rt = new RealTime::RealTime(
	RealTime::frame2RealTime(frame,sampleRate));

	return (PyObject *) self;
}

/* New RealTime object from sec and nsec */
/*static*/ PyObject *
RealTime_new(PyObject *ignored, PyObject *args)
{

	unsigned int sec = 0;
	unsigned int nsec = 0;
	double unary = 0;
	const char *fmt = NULL;

	/*Doc:: 5.5 Parsing arguments and building values*/
	if (
		
	!PyArg_ParseTuple(args, "|sd:realtime.new ", 
	(const char *) &fmt, 
	(double *) &unary) 	&&

	!PyArg_ParseTuple(args, "|II:realtime.new ", 
	(unsigned int*) &sec, 
	(unsigned int*) &nsec) 
		
	) { 
		PyErr_SetString(PyExc_TypeError, 
		"RealTime initialised with wrong arguments.");
		return NULL; }

	PyErr_Clear();

	RealTimeObject *self = 
	PyObject_New(RealTimeObject, &RealTime_Type); 
	if (self == NULL) return NULL;

	self->rt = NULL;

	if (sec == 0 && nsec == 0 && fmt == 0) 
		self->rt = new RealTime::RealTime();
	else if (fmt == 0)
		self->rt = new RealTime::RealTime(sec,nsec);
	else { 

		if (!string(fmt).compare("float") ||
			!string(fmt).compare("seconds"))  
			self->rt = new RealTime::RealTime( 
			RealTime::fromSeconds((double) unary)); 

		if (!string(fmt).compare("milliseconds")) {
			self->rt = new RealTime::RealTime( 
			RealTime::fromSeconds((double) unary / 1000.0)); }
	}

	if (!self->rt) { 
		PyErr_SetString(PyExc_TypeError, 
		"RealTime initialised with wrong arguments.");
		return NULL; 
	}

	return (PyObject *) self;
}


/* pyRealTime Module's methods table */
static PyMethodDef Module_methods[] = {

	{"frame2RealTime",	(PyCFunction)RealTime_frame2RealTime,	METH_VARARGS,
		PyDoc_STR("frame2RealTime((int64)frame, (uint32)sampleRate ) -> returns new RealTime object from frame.")},

	{"realtime",	RealTime_new,		METH_VARARGS,
		PyDoc_STR("realtime() -> returns new RealTime object")},
	
	{NULL,		NULL}		/* sentinel */
};


/*				 PyRealTime C API functions 					*/



/*RealTime from PyRealTime*/
RealTime*
PyRealTime_AsPointer (PyObject *self) { 

	RealTimeObject *s = (RealTimeObject*) self; 

	if (!PyRealTime_Check(s)) {
		PyErr_SetString(PyExc_TypeError, "RealTime Object Expected.");
		cerr << "in call PyRealTime_AsPointer(): RealTime Object Expected. " << endl;
		return NULL; }
	return s->rt; };

/*PyRealTime from RealTime*/
PyObject* 
PyRealTime_FromRealTime(Vamp::RealTime *rt) {

	RealTimeObject *self =
	PyObject_New(RealTimeObject, &RealTime_Type); 
	if (self == NULL) return NULL;

	self->rt = new RealTime::RealTime(*rt);
	return (PyObject*) self;
}


/* Module initialization (includes extern "C" {...}) */
PyMODINIT_FUNC
initpyRealTime(void)
{
	PyObject *m;

	/* Finalize the type object including setting type of the new type
	 * object; doing it here is required for portability to Windows 
	 * without requiring C++. */
	if (PyType_Ready(&RealTime_Type) < 0)
		return;

	/* Create the module and add the functions */
	m = Py_InitModule3("pyRealTime", Module_methods, module_doc);
	if (m == NULL)
		return;

//	PyModule_AddObject(m, "realtime", (PyObject *)&RealTime_Type);

}