def get_element_property(self, element_name, property):
'Gets a property of an element in the GStreamer pipeline.'
self.debug("%s: getting property %s of element %s" %
(self.getName(), property, element_name))
element = self.get_element(element_name)
if not element:
msg = "Element '%s' does not exist" % element_name
self.warning(msg)
raise errors.PropertyError(msg)
self.debug('getting property %s on element %s' %
(property, element_name))
try:
value = element.get_property(property)
except (ValueError, TypeError):
msg = "Property '%s' on element '%s' does not exist" % (
property, element_name)
self.warning(msg)
raise errors.PropertyError(msg)
# param enums and enums need to be returned by integer value
if isinstance(value, gobject.GEnum):
value = int(value)
return value
def start(self, component=None):
self.filename = self.args['properties']['logfile']
try:
self.file = open(self.filename, 'a')
except IOError, data:
raise errors.PropertyError('could not open log file %s '
'for writing (%s)' %
(self.filename, data[1]))
def gobject_set_property(object, property, value):
"""
Set the given property to the given value on the given object.
@type object: L{gobject.GObject}
@type property: string
@param value: value to set property to
"""
for pspec in gobject.list_properties(object):
if pspec.name == property:
break
else:
raise errors.PropertyError(
"Property '%s' in element '%s' does not exist" %
(property, object.get_property('name')))
if pspec.value_type in (gobject.TYPE_INT, gobject.TYPE_UINT,
gobject.TYPE_INT64, gobject.TYPE_UINT64):
try:
value = int(value)
except ValueError:
msg = "Invalid value given for property '%s' in element '%s'" % (
property, object.get_property('name'))
raise errors.PropertyError(msg)
elif pspec.value_type == gobject.TYPE_BOOLEAN:
if value == 'False':
value = False
elif value == 'True':
value = True
else:
value = bool(value)
elif pspec.value_type in (gobject.TYPE_DOUBLE, gobject.TYPE_FLOAT):
value = float(value)
elif pspec.value_type == gobject.TYPE_STRING:
value = str(value)
# FIXME: this is superevil ! we really need to find a better way
# of checking if this property is a param enum
# also, we only allow int for now
elif repr(pspec.__gtype__).startswith("<GType GParamEnum"):
value = int(value)
else:
raise errors.PropertyError('Unknown property type: %s' %
pspec.value_type)
object.set_property(property, value)
def set_element_property(self, element_name, property, value):
'Sets a property on an element in the GStreamer pipeline.'
self.debug("%s: setting property %s of element %s to %s" %
(self.getName(), property, element_name, value))
element = self.get_element(element_name)
if not element:
msg = "Element '%s' does not exist" % element_name
self.warning(msg)
raise errors.PropertyError(msg)
self.debug('setting property %s on element %r to %s' %
(property, element_name, value))
pygobject.gobject_set_property(element, property, value)