Commit 367d281a authored by Thibault Saunier's avatar Thibault Saunier Committed by Thibault Saunier

Reimplement gstpython plugin on top of PyGobject

parent 1cf5e26e
SUBDIRS = common gi
SUBDIRS = common gi plugin
# Examples and testsuite need to be ported to 1.0
#examples testsuite
......
......@@ -47,6 +47,11 @@ py_prefix=`$PYTHON -c "import sys; print(sys.prefix)"`
py_exec_prefix=`$PYTHON -c "import sys; print(sys.exec_prefix)"`
if $PYTHON-config --help 1>/dev/null 2>/dev/null; then
PYTHON_INCLUDES=`$PYTHON-config --includes 2>/dev/null`
if $PYTHON-config --abiflags 1>/dev/null 2>/dev/null; then
PYTHON_ABI_FLAGS=`$PYTHON-config --abiflags 2>/dev/null`
else
PYTHON_ABI_FLAGS=
fi
else
PYTHON_INCLUDES="-I${py_prefix}/include/python${PYTHON_VERSION}"
if test "$py_prefix" != "$py_exec_prefix"; then
......@@ -86,8 +91,12 @@ if $PYTHON-config --help 1>/dev/null 2>/dev/null; then
# default to prefix/lib for distros that don't have a link in
# .../pythonX.Y/config/
if test ! -e $PYTHON_LIB_LOC/libpython${PYTHON_VERSION}.so; then
PYTHON_LIB_LOC=${py_prefix}/lib
if test ! -e $PYTHON_LIB_LOC/libpython${PYTHON_VERSION}${PYTHON_ABI_FLAGS}.so; then
if test -e ${py_prefix}/lib64/libpython${PYTHON_VERSION}${PYTHON_ABI_FLAGS}.so; then
PYTHON_LIB_LOC=${py_prefix}/lib64
else
PYTHON_LIB_LOC=${py_prefix}/lib
fi
fi
fi
else
......@@ -111,6 +120,7 @@ fi
AC_SUBST(PYTHON_LIBS)
AC_SUBST(PYTHON_LIB_LOC)
AC_SUBST(PYTHON_ABI_FLAGS)
AC_SUBST(PYTHON_LIB_SUFFIX)
dnl check if the headers exist:
save_LIBS="$LIBS"
......
......@@ -64,7 +64,21 @@ if sys.version_info < minver:
sys.exit(1)
sys.exit(0)"
dnl check for GStreamer
GST_API_VERSION=1.0
AC_SUBST(GST_API_VERSION)
PKG_CHECK_MODULES(GST, gstreamer-$GST_API_VERSION >= $GST_REQ)
AC_DEFINE_UNQUOTED(GST_API_VERSION, "$GST_API_VERSION", [Gst API version])
GST_CFLAGS="$GST_CFLAGS $GLIB_EXTRA_CFLAGS"
AC_SUBST(GST_CFLAGS)
AC_SUBST(GST_LIBS)
dnl check for pygobject
PKG_CHECK_MODULES(PYGOBJECT, pygobject-3.0 >= $PYGOBJECT_REQ)
AC_SUBST(PYGOBJECT_CFLAGS)
dnl check for python
if $PYTHON -c "$prog" 1>&AC_FD_CC 2>&AC_FD_CC
then
AC_MSG_RESULT(okay)
......@@ -109,6 +123,8 @@ GST_CFLAGS="$GST_CFLAGS $GLIB_EXTRA_CFLAGS"
AC_SUBST(GST_CFLAGS)
AC_SUBST(GST_LIBS)
AG_GST_SET_PLUGINDIR
dnl check for pygobject
PKG_CHECK_MODULES(PYGOBJECT, pygobject-3.0 >= $PYGOBJECT_REQ)
AC_SUBST(PYGOBJECT_CFLAGS)
......@@ -117,6 +133,8 @@ dnl and set the override directory
AC_ARG_WITH([pygi_overrides_dir],
AC_HELP_STRING([--with-pygi-overrides-dir], [Path to pygobject overrides directory]))
AM_CHECK_PYTHON_LIBS(, AC_MSG_ERROR([Python libs not found. Windows requires Python modules to be explicitly linked to libpython.]))
AG_GST_VALGRIND_CHECK
dnl set release date/time
......@@ -133,5 +151,6 @@ AC_OUTPUT([
common/Makefile
common/m4/Makefile
gi/Makefile
plugin/Makefile
gi/overrides/Makefile
])
plugin_LTLIBRARIES = libgstpythonplugin.la
INCLUDES = $(PYGOBJECT_CFLAGS) $(GST_CFLAGS)\
-DPYTHON_VERSION=\"$(PYTHON_VERSION)\" \
-DPY_LIB_LOC="\"$(PYTHON_LIB_LOC)\"" \
-DPY_ABI_FLAGS="\"$(PYTHON_ABI_FLAGS)\"" \
-DPY_LIB_SUFFIX=$(PYTHON_LIB_SUFFIX) \
$(PYTHON_INCLUDES)
libgstpythonplugin_la_SOURCES = gstpythonplugin.c
libgstpythonplugin_la_LDFLAGS =
libgstpythonplugin_la_LIBADD = $(PYTHON_LIBS) $(PYGOBJECT_LIBS) $(GST_LIBS)
libgstpythonplugin_la_CFLAGS = $(GST_CFLAGS) $(PYGOBJECT_CFLAGS) $(GST_PLUGINS_BASE_CFLAGS) $(PYTHON_INCLUDES)
/* gst-python
* Copyright (C) 2009 Edward Hervey <bilboed@bilboed.com>
* 2005 Benjamin Otte <otte@gnome.org>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/* include this first, before NO_IMPORT_PYGOBJECT is defined */
#include <pygobject.h>
#include <gst/gst.h>
#include <gmodule.h>
#include <Python.h>
void *_PyGstElement_Type;
GST_DEBUG_CATEGORY_STATIC (pyplugindebug);
#define GST_CAT_DEFAULT pyplugindebug
#define GST_ORIGIN "http://gstreamer.freedesktop.org"
static PyObject *element;
static gboolean
gst_python_plugin_load_file (GstPlugin * plugin, const char *name)
{
PyObject *main_module, *main_locals;
PyObject *elementfactory;
PyObject *module;
const gchar *facname;
guint rank;
PyObject *class;
GST_DEBUG ("loading plugin %s", name);
main_module = PyImport_AddModule ("__main__");
if (main_module == NULL) {
GST_WARNING ("Could not get __main__, ignoring plugin %s", name);
PyErr_Print ();
PyErr_Clear ();
return FALSE;
}
main_locals = PyModule_GetDict (main_module);
module =
PyImport_ImportModuleEx ((char *) name, main_locals, main_locals, NULL);
if (!module) {
GST_DEBUG ("Could not load module, ignoring plugin %s", name);
PyErr_Print ();
PyErr_Clear ();
return FALSE;
}
/* Get __gstelementfactory__ from file */
elementfactory = PyObject_GetAttrString (module, "__gstelementfactory__");
if (!elementfactory) {
GST_DEBUG ("python file doesn't contain __gstelementfactory__");
PyErr_Clear ();
return FALSE;
}
/* parse tuple : name, rank, gst.ElementClass */
if (!PyArg_ParseTuple (elementfactory, "sIO", &facname, &rank, &class)) {
GST_WARNING ("__gstelementfactory__ isn't correctly formatted");
PyErr_Print ();
PyErr_Clear ();
Py_DECREF (elementfactory);
return FALSE;
}
if (!PyObject_IsSubclass (class, (PyObject *) & PyGObject_Type)) {
GST_WARNING ("the class provided isn't a subclass of GObject.Object");
PyErr_Print ();
PyErr_Clear ();
Py_DECREF (elementfactory);
Py_DECREF (class);
return FALSE;
}
if (!g_type_is_a (pyg_type_from_object (class), GST_TYPE_ELEMENT)) {
GST_WARNING ("the class provided isn't a subclass of Gst.Element");
PyErr_Print ();
PyErr_Clear ();
Py_DECREF (elementfactory);
Py_DECREF (class);
return FALSE;
}
GST_INFO ("Valid plugin");
Py_DECREF (elementfactory);
return gst_element_register (plugin, facname, rank,
pyg_type_from_object (class));
}
static gboolean
gst_python_load_directory (GstPlugin * plugin, gchar * path)
{
GDir *dir;
const gchar *file;
GError *error = NULL;
gboolean ret = TRUE;
dir = g_dir_open (path, 0, &error);
if (!dir) {
/*retval should probably be depending on error, but since we ignore it... */
GST_DEBUG ("Couldn't open Python plugin dir: %s", error->message);
g_error_free (error);
return FALSE;
}
while ((file = g_dir_read_name (dir))) {
/* FIXME : go down in subdirectories */
if (g_str_has_suffix (file, ".py")) {
gsize len = strlen (file) - 3;
gchar *name = g_strndup (file, len);
ret &= gst_python_plugin_load_file (plugin, name);
g_free (name);
}
}
return TRUE;
}
static gboolean
gst_python_plugin_load (GstPlugin * plugin)
{
PyObject *sys_path;
const gchar *plugin_path;
gboolean ret = TRUE;
sys_path = PySys_GetObject ("path");
/* Mimic the order in which the registry is checked in core */
/* 1. check env_variable GST_PLUGIN_PATH */
plugin_path = g_getenv ("GST_PLUGIN_PATH");
if (plugin_path) {
char **list;
int i;
GST_DEBUG ("GST_PLUGIN_PATH set to %s", plugin_path);
list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
for (i = 0; list[i]; i++) {
gchar *sysdir = g_build_filename (list[i], "python", NULL);
PyList_Insert (sys_path, 0, PyUnicode_FromString (sysdir));
gst_python_load_directory (plugin, sysdir);
g_free (sysdir);
}
g_strfreev (list);
}
/* 2. Check for GST_PLUGIN_SYSTEM_PATH */
plugin_path = g_getenv ("GST_PLUGIN_SYSTEM_PATH");
if (plugin_path == NULL) {
char *home_plugins;
/* 2.a. Scan user and system-wide plugin directory */
GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH not set");
/* plugins in the user's home directory take precedence over
* system-installed ones */
home_plugins = g_build_filename (g_get_home_dir (),
".gstreamer-" GST_API_VERSION, "plugins", "python", NULL);
PyList_Insert (sys_path, 0, PyUnicode_FromString (home_plugins));
gst_python_load_directory (plugin, home_plugins);
g_free (home_plugins);
/* add the main (installed) library path */
PyList_Insert (sys_path, 0, PyUnicode_FromString (PLUGINDIR "/python"));
gst_python_load_directory (plugin, PLUGINDIR "/python");
} else {
gchar **list;
gint i;
/* 2.b. Scan GST_PLUGIN_SYSTEM_PATH */
GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH set to %s", plugin_path, plugin_path);
list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
for (i = 0; list[i]; i++) {
gchar *sysdir;
sysdir = g_build_filename (list[i], "python", NULL);
PyList_Insert (sys_path, 0, PyUnicode_FromString (sysdir));
gst_python_load_directory (plugin, sysdir);
g_free (sysdir);
}
g_strfreev (list);
}
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
PyGILState_STATE state;
PyObject *gst, *dict, *pyplugin;
gboolean we_initialized = FALSE;
GModule *libpython;
gpointer has_python = NULL;
PyObject *seq, *list;
int i, len;
GST_DEBUG_CATEGORY_INIT (pyplugindebug, "pyplugin", 0,
"Python plugin loader");
gst_plugin_add_dependency_simple (plugin,
"HOME/.gstreamer-" GST_API_VERSION
"/plugins/python:GST_PLUGIN_SYSTEM_PATH/python:GST_PLUGIN_PATH/python",
PLUGINDIR "/python:HOME/.gstreamer-" GST_API_VERSION "/plugins/python:"
"GST_PLUGIN_SYSTEM_PATH/python:GST_PLUGIN_PATH/python", NULL,
GST_PLUGIN_DEPENDENCY_FLAG_NONE);
GST_LOG ("Checking to see if libpython is already loaded");
g_module_symbol (g_module_open (NULL, G_MODULE_BIND_LOCAL), "_Py_NoneStruct",
&has_python);
if (has_python) {
GST_LOG ("libpython is already loaded");
} else {
GST_LOG ("loading libpython");
libpython =
g_module_open (PY_LIB_LOC "/libpython" PYTHON_VERSION PY_ABI_FLAGS
"." PY_LIB_SUFFIX, 0);
if (!libpython) {
GST_WARNING ("Couldn't g_module_open libpython. Reason: %s",
g_module_error ());
return FALSE;
}
}
if (!Py_IsInitialized ()) {
GST_LOG ("python wasn't initialized");
/* set the correct plugin for registering stuff */
Py_Initialize ();
we_initialized = TRUE;
} else {
GST_LOG ("python was already initialized");
state = PyGILState_Ensure ();
}
GST_LOG ("initializing pygobject");
if (!pygobject_init (3, 0, 0)) {
GST_WARNING ("pygobject initialization failed");
return FALSE;
}
gst = PyImport_ImportModule ("gi.repository.Gst");
if (we_initialized) {
PyObject *tmp;
dict = PyModule_GetDict (gst);
if (!dict) {
GST_ERROR ("no dict?!");
}
tmp =
PyObject_GetAttr (PyMapping_GetItemString (dict,
"_introspection_module"), PyUnicode_FromString ("__dict__"));
_PyGstElement_Type = PyMapping_GetItemString (tmp, "Element");
if (!_PyGstElement_Type) {
g_error ("Could not get Gst.Element");
Py_DECREF (pyplugin);
}
pyplugin = pygobject_new (G_OBJECT (plugin));
if (!pyplugin || PyModule_AddObject (gst, "__plugin__", pyplugin) != 0) {
g_warning ("Couldn't set plugin");
Py_DECREF (pyplugin);
}
}
gst_python_plugin_load (plugin);
if (we_initialized) {
/* We need to release the GIL since we're going back to C land */
PyEval_SaveThread ();
} else
PyGILState_Release (state);
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR, python,
"loader for plugins written in python",
plugin_init, VERSION, "LGPL", PACKAGE_NAME, GST_ORIGIN)
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