gstreamer/gst/gstobject.override

/* -*- Mode: C; ; c-file-style: "python" -*- */
/* gst-python
 * Copyright (C) 2005 Edward Hervey
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library 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.
 * 
 * Author: Edward Hervey <edward@fluendo.com>
 */

%%
ignore
  gst_object_default_deep_notify
  gst_object_check_uniqueness
  gst_object_replace

%%
override-attr GstObject.__gstrefcount__

/* keep this attribute around even after 2.8 for compatibility reasons */
static PyObject *
_wrap_gst_object__get___gstrefcount__(PyGObject *self, void *closure)
{
    return PyInt_FromLong(GST_OBJECT_REFCOUNT_VALUE(self->obj));
}


/* < GLib 2.8 */

/* because of our gst_object_ref/_unref, we do our own GC-related
 * functions:
 * our own tp_traverse that checks the GstObject refcount,
 * and reuse _dealloc and _clear from gobject.GObject for ours
 * compare with pygtk/gobject/pygobject.c
 */

/* a define is a little evil, but it seems to generate the right code
 * to allow us to do our garbage collection routines */
%%
override-slot GstObject.tp_flags
#define _wrap_gst_object_tp_flags Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC 

%%
override-slot GstObject.tp_traverse
static int
_wrap_gst_object_tp_traverse(PyGObject *self, visitproc visit, void *arg)
{
    int ret = 0;
    GSList *tmp;

    GST_LOG_OBJECT(self->obj,
            "gst.Object.tp_traverse");

    Py_VISIT(self->inst_dict);

    for (tmp = self->closures; tmp != NULL; tmp = tmp->next) {
        PyGClosure *closure = tmp->data;

        Py_VISIT(closure->callback);
        Py_VISIT(closure->extra_args);
        Py_VISIT(closure->swap_data);
    }

    if (self->obj && GST_OBJECT_REFCOUNT_VALUE(self->obj) == 1 && GST_OBJECT(self->obj)->parent == NULL) {
        GST_DEBUG_OBJECT(self->obj,
            "gst.Object.tp_traverse: GstObject refcount of %p is 1, visit",
            self->obj);
        ret = visit((PyObject *)self, arg);
        GST_LOG_OBJECT(self->obj,
            "gst.Object.tp_traverse: GstObject %p visited, ret %d",
            self->obj, ret);
    }

    return ret;
}

%%
override-slot GstObject.tp_clear
int
_wrap_gst_object_tp_clear(PyGObject *self)
{
    int ret;
    GObject *obj = self->obj;

    /* if we're a GstObject, we want to monkeypatch the GObject.tp_clear's
     * g_object_unref and "replace" it with a gst_object_unref */
    if (! GST_IS_OBJECT (obj))
        obj = NULL;
    else {
        GST_DEBUG_OBJECT (obj,
          "gst.Object.tp_clear, pyo %p, pyo rc %d, gsto %p, gst rc %d",
          self, ((PyObject *) self)->ob_refcnt, obj,
          GST_OBJECT_REFCOUNT_VALUE (obj));
        g_object_ref (obj);
    }

    ret = PyGObject_Type.tp_clear((PyObject *) self);

    if (obj)
        gst_object_unref (obj);

    return ret;
}

%%
override-slot GstObject.tp_dealloc
void
_wrap_gst_object_tp_dealloc(PyGObject *self)
{
    GObject *obj = self->obj;

    /* if we're a GstObject, we want to monkeypatch the GObject.tp_dealloc's
     * g_object_unref and "replace" it with a gst_object_unref */
    if (GST_IS_OBJECT (obj)) {
        GST_DEBUG_OBJECT (obj, "gst.Object.tp_dealloc, go rc %d, gsto rc %d",
            obj->ref_count, GST_OBJECT_REFCOUNT_VALUE (obj));
	if (GST_OBJECT_REFCOUNT_VALUE (obj) == 0) {
            /* already being finalized, can't resurrect object */
            obj = NULL;
            self->obj = NULL;
        } else {
          g_object_ref (obj);
        }
    } else {
        obj = NULL;
    }

    PyGObject_Type.tp_dealloc((PyObject *) self);

    if (obj)
        gst_object_unref (obj);
}

%%
override-slot GstObject.tp_repr
static PyObject *
_wrap_gst_object_tp_repr(PyObject *self)
{
    gchar *repr;
    PyObject *ret;
    GstObject *object = GST_OBJECT (pygobject_get (self));

    repr = g_strdup_printf ("<%s object (%s) at 0x%lx>",
	       self->ob_type->tp_name,
	       GST_OBJECT_NAME(object) ? GST_OBJECT_NAME(object) : "unnamed",
	       (long)self);
    ret = PyString_FromString(repr);
    g_free (repr);
    return ret;
}

%%
override-slot GstObject.tp_str
static PyObject *
_wrap_gst_object_tp_str(PyObject *self)
{
    gchar *repr, *path;
    PyObject *ret;
    GstObject *object = GST_OBJECT (pygobject_get (self));

    path = gst_object_get_path_string (object);
    repr = g_strdup_printf ("%s (%s)",
	       path, self->ob_type->tp_name);
    ret = PyString_FromString(repr);
    g_free (repr);
    g_free (path);
    return ret;
}