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