class Rtcp(object):
"""
RFC 3605 (http://www.rfc-editor.org/rfc/rfc3605.txt)
Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP)
"""
def __init__(self, attributes):
assert type(attributes) is AttributeCollection
self.__attributes = attributes
rtcps = attributes.get("rtcp")
assert len(rtcps) < 2
self.__rtcp_attribute = rtcps[0] if len(rtcps) == 1 else None
def __nonzero__(self):
return self.__rtcp_attribute is not None
@property
def port(self):
return self.__rtcp_attribute.value.port if self.__rtcp_attribute else None
@port.setter
def port(self, port):
assert type(port) is int
if self.__rtcp_attribute is not None:
self.__rtcp_attribute.value.port = port
else:
self.__add_attribute(port)
@property
def connection_address(self):
return self.__rtcp_attribute.value.connection_address if self.__rtcp_attribute else None
@connection_address.setter
def connection_address(self, connection_address):
assert type(connection_address) is str
if self.__rtcp_attribute is not None:
self.__rtcp_attribute.value.connection_address = connection_address
else:
self.__add_attribute(0, NetType.IN, AddrType.IP4,
connection_address)
def __add_attribute(self,
port,
nettype=None,
addrtype=None,
connection_address=None):
assert self.__rtcp_attribute is None
assert type(port) is int
self.__rtcp_attribute = Attribute(
"rtcp", RtcpAttribute(port, nettype, addrtype, connection_address))
self.__attributes.append(self.__rtcp_attribute)
def __remove_attribute(self):
assert self.__rtcp_attribute is not None
self.__rtcp_attribute.remove()
self.__rtcp_attribute = None
class Ptime(object):
def __init__(self, attributes):
assert type(attributes) is AttributeCollection
self.__attributes = attributes
ptimes = attributes.get("ptime")
assert len(ptimes) < 2
self.__ptime_attribute = ptimes[0] if len(ptimes) == 1 else None
def __nonzero__(self):
return self.__ptime_attribute is not None
@property
def packet_time(self):
return self.__ptime_attribute.value.packet_time if self.__ptime_attribute else None
@packet_time.setter
def packet_time(self, packet_time):
assert packet_time is None or type(packet_time) is int
if packet_time is not None:
self.__set_packet_time(packet_time)
else:
self.__remove_packet_time()
def __set_packet_time(self, packet_time):
assert type(packet_time) is int
if self.__ptime_attribute is not None:
self.__ptime_attribute.value.packet_time = packet_time
else:
self.__ptime_attribute = Attribute("ptime",
PtimeValue(packet_time))
self.__attributes.append(self.__ptime_attribute)
def __remove_packet_time(self):
if self.__ptime_attribute is not None:
self.__ptime_attribute.remove()
self.__ptime_attribute = None
class Mid(object):
def __init__(self, attributes):
assert type(attributes) is AttributeCollection
self.__attributes = attributes
mids = self.__attributes.get("mid")
if len(mids) > 1:
raise SemanticError("More than one mid attribute")
self.__attribute = mids[0] if len(mids) == 1 else None
@property
def value(self):
return self.__attribute.value.value if self.__attribute else None
@value.setter
def value(self, value):
assert value is None or type(value) is str
if value is not None:
self.__set_attribute(value)
else:
self.__remove_attribute()
def __nonzero__(self):
return self.value is not None
def __set_attribute(self, value):
assert type(value) is str
if self.__attribute is None:
self.__attribute = Attribute("mid", RawMid(value))
self.__attribute.appendTo(self.__attributes)
else:
self.__attribute.value.value = value
def __remove_attribute(self):
if self.__attribute is not None:
self.__attribute.remove()
self.__attribute = None
class RtcpMux(object):
"""
RFC 5761
Multiplexing RTP Data and Control Packets on a Single Port
"""
def __init__(self, attributes):
assert type(attributes) is AttributeCollection
self.__attributes = attributes
rtcpmuxs = attributes.get("rtcp-mux")
assert len(rtcpmuxs) < 2
self.__rtcpmux_attribute = rtcpmuxs[0] if len(rtcpmuxs) == 1 else None
def __nonzero__(self):
return self.value
@property
def value(self):
return self.__rtcpmux_attribute is not None
@value.setter
def value(self, value):
assert type(value) is bool
if self.__rtcpmux_attribute is None and value:
self.__add_attribute()
elif self.__rtcpmux_attribute is not None and not value:
self.__remove_attribute()
def __add_attribute(self):
assert self.__rtcpmux_attribute is None
self.__rtcpmux_attribute = Attribute("rtcp-mux", RtcpMuxAttribute())
self.__attributes.append(self.__rtcpmux_attribute)
def __remove_attribute(self):
assert self.__rtcpmux_attribute is not None
self.__rtcpmux_attribute.remove()
self.__rtcpmux_attribute = None