gstreamer/gst/pygstminiobject.c
Edward Hervey 2a96c988c0 gst/gstbuffer.override: Proper wrapping of the GstBuffer.caps attribute
Original commit message from CVS:
* gst/gstbuffer.override: (_wrap_gst_buffer__get_caps):
Proper wrapping of the GstBuffer.caps attribute
* gst/gstmodule.c: (init_gst):
* gst/pygstminiobject.c: (pygstminiobject_register_class):
gst-debug initialisation should happen before anything else if we
want the debugging functions to work.
2005-10-06 13:51:31 +00:00

412 lines
12 KiB
C

/* -*- Mode: C; c-basic-offset: 4 -*-
* pygtk- Python bindings for the GTK toolkit.
* Copyright (C) 1998-2003 James Henstridge
*
* pygobject.c: wrapper for the GObject type.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include <gst/gst.h>
#include "pygstminiobject.h"
static const gchar *pygstminiobject_class_id = "PyGstMiniObject::class";
static GQuark pygstminiobject_class_key = 0;
/* static const gchar *pygstminiobject_wrapper_id = "PyGstMiniObject::wrapper"; */
/* static GQuark pygstminiobject_wrapper_key = 0; */
static void pygstminiobject_dealloc(PyGstMiniObject *self);
/* static int pygstminiobject_traverse(PyGstMiniObject *self, visitproc visit, void *arg); */
/* static int pygstminiobject_clear(PyGstMiniObject *self); */
GST_DEBUG_CATEGORY_EXTERN (pygst_debug);
#define GST_CAT_DEFAULT pygst_debug
static GHashTable *_miniobjs;
void
pygst_miniobject_init ()
{
_miniobjs = g_hash_table_new (NULL, NULL);
}
/**
* pygstminiobject_lookup_class:
* @gtype: the GType of the GstMiniObject subclass.
*
* This function looks up the wrapper class used to represent
* instances of a GstMiniObject represented by @gtype. If no wrapper class
* or interface has been registered for the given GType, then a new
* type will be created.
*
* Returns: The wrapper class for the GstMiniObject or NULL if the
* GType has no registered type and a new type couldn't be created
*/
PyTypeObject *
pygstminiobject_lookup_class(GType gtype)
{
PyTypeObject *py_type = NULL;
GType ctype = gtype;
while (!py_type && ctype) {
py_type = g_type_get_qdata(ctype, pygstminiobject_class_key);
ctype = g_type_parent(ctype);
}
if (!ctype)
g_error ("Couldn't find a good base type!!");
return py_type;
}
/**
* pygstminiobject_register_class:
* @dict: the module dictionary. A reference to the type will be stored here.
* @type_name: not used ?
* @gtype: the GType of the Gstminiobject subclass.
* @type: the Python type object for this wrapper.
* @bases: a tuple of Python type objects that are the bases of this type.
*
* This function is used to register a Python type as the wrapper for
* a particular Gstminiobject subclass. It will also insert a reference to
* the wrapper class into the module dictionary passed as a reference,
* which simplifies initialisation.
*/
void
pygstminiobject_register_class(PyObject *dict, const gchar *type_name,
GType gtype, PyTypeObject *type,
PyObject *bases)
{
PyObject *o;
const char *class_name, *s;
if (!pygstminiobject_class_key)
pygstminiobject_class_key = g_quark_from_static_string(pygstminiobject_class_id);
class_name = type->tp_name;
s = strrchr(class_name, '.');
if (s != NULL)
class_name = s + 1;
type->ob_type = &PyType_Type;
type->tp_alloc = PyType_GenericAlloc;
type->tp_new = PyType_GenericNew;
if (bases) {
type->tp_bases = bases;
type->tp_base = (PyTypeObject *)PyTuple_GetItem(bases, 0);
}
if (PyType_Ready(type) < 0) {
g_warning ("couldn't make the type `%s' ready", type->tp_name);
return;
}
if (gtype) {
o = pyg_type_wrapper_new(gtype);
PyDict_SetItemString(type->tp_dict, "__gtype__", o);
Py_DECREF(o);
/* stash a pointer to the python class with the GType */
Py_INCREF(type);
g_type_set_qdata(gtype, pygstminiobject_class_key, type);
}
PyDict_SetItemString(dict, (char *)class_name, (PyObject *)type);
}
/**
* pygstminiobject_register_wrapper:
* @self: the wrapper instance
*
* In the constructor of PyGTK wrappers, this function should be
* called after setting the obj member. It will tie the wrapper
* instance to the Gstminiobject so that the same wrapper instance will
* always be used for this Gstminiobject instance. It will also sink any
* floating references on the Gstminiobject.
*/
void
pygstminiobject_register_wrapper (PyObject *self)
{
GstMiniObject *obj = ((PyGstMiniObject *) self)->obj;
PyGILState_STATE state;
g_assert (obj);
GST_DEBUG ("inserting self %p in the table for object %p", self, obj);
state = pyg_gil_state_ensure ();
g_hash_table_insert (_miniobjs, (gpointer) obj, (gpointer) self);
pyg_gil_state_release (state);
}
/**
* pygstminiobject_new:
* @obj: a GstMiniObject instance.
*
* This function gets a reference to a wrapper for the given GstMiniObject
* instance. If a wrapper has already been created, a new reference
* to that wrapper will be returned. Otherwise, a wrapper instance
* will be created.
*
* Returns: a reference to the wrapper for the GstMiniObject.
*/
PyObject *
pygstminiobject_new (GstMiniObject *obj)
{
PyGILState_STATE state;
PyGstMiniObject *self = NULL;
if (obj == NULL) {
Py_INCREF (Py_None);
return Py_None;
}
/* see if we already have a wrapper for this object */
state = pyg_gil_state_ensure ();
self = (PyGstMiniObject *) g_hash_table_lookup (_miniobjs, (gpointer) obj);
pyg_gil_state_release (state);
if (self != NULL) {
GST_DEBUG ("had self %p in the table for object %p", self, obj);
/* make sure the lookup returned our object */
g_assert (self->obj);
g_assert (self->obj == obj);
GST_INFO ("Increment refcount %p", self);
Py_INCREF (self);
} else {
GST_DEBUG ("have to create wrapper for object %p", obj);
/* we don't, so create one */
PyTypeObject *tp = pygstminiobject_lookup_class (G_OBJECT_TYPE (obj));
if (!tp)
g_warning ("Couldn't get class for type object : %p", obj);
if (tp->tp_flags & Py_TPFLAGS_HEAPTYPE) {
GST_INFO ("Increment refcount %p", tp);
Py_INCREF (tp);
}
self = PyObject_New (PyGstMiniObject, tp);
if (self == NULL)
return NULL;
self->obj = gst_mini_object_ref (obj);
self->inst_dict = NULL;
self->weakreflist = NULL;
/* save wrapper pointer so we can access it later */
GST_DEBUG ("inserting self %p in the table for object %p", self, obj);
state = pyg_gil_state_ensure ();
g_hash_table_insert (_miniobjs, (gpointer) obj, (gpointer) self);
pyg_gil_state_release (state);
}
return (PyObject *) self;
}
static void
pygstminiobject_dealloc(PyGstMiniObject *self)
{
g_return_if_fail (self != NULL);
PyGILState_STATE state;
GST_INFO ("At the beginning %p", self);
state = pyg_gil_state_ensure();
if (self->obj) {
GST_DEBUG ("removing self %p from the table for object %p", self,
self->obj);
g_assert (g_hash_table_remove (_miniobjs, (gpointer) self->obj));
gst_mini_object_unref(self->obj);
}
GST_DEBUG ("setting self %p -> obj to NULL", self);
self->obj = NULL;
if (self->inst_dict) {
Py_DECREF(self->inst_dict);
}
self->inst_dict = NULL;
self->ob_type->tp_free((PyObject *) self);
pyg_gil_state_release(state);
GST_INFO ("At the end %p", self);
}
static int
pygstminiobject_compare(PyGstMiniObject *self, PyGstMiniObject *v)
{
if (self->obj == v->obj) return 0;
if (self->obj > v->obj) return -1;
return 1;
}
static long
pygstminiobject_hash(PyGstMiniObject *self)
{
return (long)self->obj;
}
static PyObject *
pygstminiobject_repr(PyGstMiniObject *self)
{
gchar buf[256];
g_snprintf(buf, sizeof(buf),
"<%s mini-object (%s) at 0x%lx>",
self->ob_type->tp_name,
self->obj ? G_OBJECT_TYPE_NAME(self->obj) : "uninitialized",
(long)self);
return PyString_FromString(buf);
}
static void
pygstminiobject_free(PyObject *op)
{
PyObject_FREE(op);
}
/* ---------------- PyGstMiniObject methods ----------------- */
static int
pygstminiobject_init(PyGstMiniObject *self, PyObject *args, PyObject *kwargs)
{
GType object_type;
GstMiniObjectClass *class;
if (!PyArg_ParseTuple(args, ":GstMiniObject.__init__", &object_type))
return -1;
object_type = pyg_type_from_object((PyObject *)self);
if (!object_type)
return -1;
if (G_TYPE_IS_ABSTRACT(object_type)) {
PyErr_Format(PyExc_TypeError, "cannot create instance of abstract "
"(non-instantiable) type `%s'", g_type_name(object_type));
return -1;
}
if ((class = g_type_class_ref (object_type)) == NULL) {
PyErr_SetString(PyExc_TypeError,
"could not get a reference to type class");
return -1;
}
self->obj = gst_mini_object_new(object_type);
if (self->obj == NULL)
PyErr_SetString (PyExc_RuntimeError, "could not create object");
g_type_class_unref(class);
return (self->obj) ? 0 : -1;
}
static PyObject *
pygstminiobject__gstminiobject_init__(PyGstMiniObject *self, PyObject *args, PyObject *kwargs)
{
if (pygstminiobject_init(self, args, kwargs) < 0)
return NULL;
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
pygstminiobject_copy(PyGstMiniObject *self, PyObject *args)
{
return pygstminiobject_new(gst_mini_object_copy(self->obj));
}
static PyMethodDef pygstminiobject_methods[] = {
{ "__gstminiobject_init__", (PyCFunction)pygstminiobject__gstminiobject_init__,
METH_VARARGS|METH_KEYWORDS },
{ "copy", (PyCFunction)pygstminiobject_copy, METH_VARARGS, "Copies the miniobject"},
{ NULL, NULL, 0 }
};
static PyObject *
pygstminiobject_get_dict(PyGstMiniObject *self, void *closure)
{
if (self->inst_dict == NULL) {
self->inst_dict = PyDict_New();
if (self->inst_dict == NULL)
return NULL;
}
Py_INCREF(self->inst_dict);
return self->inst_dict;
}
static PyObject *
pygstminiobject_get_refcount(PyGstMiniObject *self, void *closure)
{
return PyInt_FromLong(GST_MINI_OBJECT_REFCOUNT_VALUE(self->obj));
}
static PyObject *
pygstminiobject_get_flags(PyGstMiniObject *self, void *closure)
{
return PyInt_FromLong(GST_MINI_OBJECT_FLAGS(self->obj));
}
static PyGetSetDef pygstminiobject_getsets[] = {
{ "__dict__", (getter)pygstminiobject_get_dict, (setter)0 },
{ "__grefcount__", (getter)pygstminiobject_get_refcount, (setter)0, },
{ "flags", (getter)pygstminiobject_get_flags, (setter)0, },
{ NULL, 0, 0 }
};
PyTypeObject PyGstMiniObject_Type = {
PyObject_HEAD_INIT(NULL)
0, /* ob_size */
"gst.GstMiniObject", /* tp_name */
sizeof(PyGstMiniObject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)pygstminiobject_dealloc, /* tp_dealloc */
(printfunc)0, /* tp_print */
(getattrfunc)0, /* tp_getattr */
(setattrfunc)0, /* tp_setattr */
(cmpfunc)pygstminiobject_compare, /* tp_compare */
(reprfunc)pygstminiobject_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
(hashfunc)pygstminiobject_hash, /* tp_hash */
(ternaryfunc)0, /* tp_call */
(reprfunc)0, /* tp_str */
(getattrofunc)0, /* tp_getattro */
(setattrofunc)0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
NULL, /* Documentation string */
(traverseproc)0, /* tp_traverse */
(inquiry)0, /* tp_clear */
(richcmpfunc)0, /* tp_richcompare */
offsetof(PyGstMiniObject, weakreflist), /* tp_weaklistoffset */
(getiterfunc)0, /* tp_iter */
(iternextfunc)0, /* tp_iternext */
pygstminiobject_methods, /* tp_methods */
0, /* tp_members */
pygstminiobject_getsets, /* tp_getset */
(PyTypeObject *)0, /* tp_base */
(PyObject *)0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
offsetof(PyGstMiniObject, inst_dict), /* tp_dictoffset */
(initproc)pygstminiobject_init, /* tp_init */
(allocfunc)0, /* tp_alloc */
(newfunc)0, /* tp_new */
(freefunc)pygstminiobject_free, /* tp_free */
(inquiry)0, /* tp_is_gc */
(PyObject *)0, /* tp_bases */
};