gstreamer/gst/gstbus.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>
 */
%%
headers
static GstBusSyncReply
bus_sync_handler (GstBus *bus, GstMessage *message, gpointer user_data)
{
	PyGILState_STATE state;
	GstBusSyncReply	res;
	PyObject	*py_userdata;
	PyObject	*py_msg;
	PyObject	*callback, *args;
	PyObject	*ret;
	gint		i,len;

	g_return_val_if_fail (user_data != NULL, GST_BUS_PASS);

	state = pyg_gil_state_ensure();

	py_userdata = (PyObject *) user_data;
	py_msg = pygstminiobject_new(GST_MINI_OBJECT(message));
	callback = PyTuple_GetItem(py_userdata, 0);
	args = Py_BuildValue("(NN)",
			     pygobject_new(G_OBJECT(bus)),
			     py_msg);

	len = PyTuple_Size(py_userdata);
	for (i = 1; i < len; ++i) {
		PyObject *tuple = args;
		args = PySequence_Concat(tuple, PyTuple_GetItem(py_userdata, i));
		Py_DECREF(tuple);
	}
	ret = PyObject_CallObject(callback, args);

	if (!ret) {
		PyErr_Print();
		res = GST_BUS_PASS;
	} else {
		if (ret == Py_None) {
			PyErr_SetString(PyExc_TypeError, "callback should return a BusSyncReply");
			PyErr_Print();
			res = GST_BUS_PASS;	
		} else if (pyg_enum_get_value(GST_TYPE_BUS_SYNC_REPLY, ret, (gint *) &res))
			res = GST_BUS_PASS;
		Py_DECREF (ret);
	}
	Py_DECREF(py_msg);
	Py_DECREF(args);

	pyg_gil_state_release(state);

	return res;
}

static gboolean
bus_handler (GstBus *bus, GstMessage *message, gpointer user_data)
{
	PyGILState_STATE state;
	gboolean	res;
	PyObject	*py_userdata;
 	PyObject	*py_msg;
	PyObject	*callback, *args;
	PyObject	*ret;
	gint		i,len;

	g_return_val_if_fail (user_data != NULL, TRUE);

	state = pyg_gil_state_ensure();

	py_userdata = (PyObject *) user_data;
 	py_msg = pygstminiobject_new(GST_MINI_OBJECT(message));
	callback = PyTuple_GetItem(py_userdata, 0);
	args = Py_BuildValue("(NN)",
			     pygobject_new(G_OBJECT(bus)),
			     py_msg);

	len = PyTuple_Size(py_userdata);
	for (i = 1; i < len; ++i) {
		PyObject *tuple = args;
		args = PySequence_Concat(tuple, PyTuple_GetItem(py_userdata, i));
		Py_DECREF(tuple);
	}
	ret = PyObject_CallObject(callback, args);

	if (!ret) {
		PyErr_Print();
		res = TRUE;
	} else {
		if (ret == Py_None) {
			PyErr_SetString(PyExc_TypeError, "callback should return True or False");
			PyErr_Print();
			res = TRUE;
		} else 
			res = PyObject_IsTrue(ret);
		Py_DECREF(ret);
	}
	Py_DECREF(py_msg);
	Py_DECREF(args);

	pyg_gil_state_release(state);

	return res;
}

%%
override gst_bus_set_sync_handler args
static PyObject *
_wrap_gst_bus_set_sync_handler (PyGObject *self, PyObject *args)
{
    PyObject *callback, *cbargs = NULL, *data;
    gint len;

    len = PyTuple_Size(args);

    if (len < 1) {
	PyErr_SetString(PyExc_TypeError, "Bus requires at least 1 arg");
	return NULL;
    }
    callback = PySequence_GetItem(args, 0);
    if (!PyCallable_Check(callback)) {
	PyErr_SetString(PyExc_TypeError, "callback is not callable");
	return NULL;
    }
    cbargs = PySequence_GetSlice(args, 1, len);
    if (cbargs == NULL)
	return NULL;
    data = Py_BuildValue("(ON)", callback, cbargs);
    if (data == NULL)
	return NULL;
    gst_bus_set_sync_handler (GST_BUS (self->obj),
				      (GstBusSyncHandler) bus_sync_handler, 
				      data);

    return (PyObject*) self;

}
%%
override gst_bus_add_watch args
static PyObject *
_wrap_gst_bus_add_watch (PyGObject *self, PyObject *args)
{
    PyObject *callback, *cbargs = NULL, *data;
    guint sigid;
    guint len;

    len = PyTuple_Size(args);

    if (len < 1) {
	PyErr_SetString(PyExc_TypeError, "Bus requires at least 1 arg");
	return NULL;
    }
    callback = PySequence_GetItem(args, 0);
    if (!PyCallable_Check(callback)) {
	PyErr_SetString(PyExc_TypeError, "callback is not callable");
	return NULL;
    }
    cbargs = PySequence_GetSlice(args, 1, len);
    if (cbargs == NULL)
	return NULL;
    data = Py_BuildValue("(ON)", callback, cbargs);
    if (data == NULL)
	return NULL;
    sigid = gst_bus_add_watch (GST_BUS (self->obj), (GstBusHandler) bus_handler, data);

    return PyInt_FromLong(sigid);
}