def initialize(self, session, direction):
with self._lock:
if self.state != "NULL":
raise RuntimeError("%sStream.initialize() may only be called in the NULL state" % self.type.capitalize())
self.state = "INITIALIZING"
self.session = session
local_encryption_policy = session.account.rtp.encryption.key_negotiation if session.account.rtp.encryption.enabled else None
if hasattr(self, "_incoming_remote_sdp"):
# ICE attributes could come at the session level or at the media level
remote_stream = self._incoming_remote_sdp.media[self._incoming_stream_index]
self._try_ice = self.session.account.nat_traversal.use_ice and ((remote_stream.has_ice_attributes or self._incoming_remote_sdp.has_ice_attributes) and remote_stream.has_ice_candidates)
if self._incoming_stream_encryption is not None and local_encryption_policy == 'opportunistic':
self._srtp_encryption = self._incoming_stream_encryption
else:
self._srtp_encryption = 'zrtp' if local_encryption_policy == 'opportunistic' else local_encryption_policy
del self._incoming_stream_encryption
else:
self._try_ice = self.session.account.nat_traversal.use_ice
self._srtp_encryption = 'zrtp' if local_encryption_policy == 'opportunistic' else local_encryption_policy
if self._try_ice:
if self.session.account.nat_traversal.stun_server_list:
stun_servers = list((server.host, server.port) for server in self.session.account.nat_traversal.stun_server_list)
self._init_rtp_transport(stun_servers)
elif not isinstance(self.session.account, BonjourAccount):
dns_lookup = DNSLookup()
self.notification_center.add_observer(self, sender=dns_lookup)
dns_lookup.lookup_service(SIPURI(self.session.account.id.domain), "stun")
else:
self._init_rtp_transport()
def initialize(self, session, direction):
with self._lock:
if self.state != "NULL":
raise RuntimeError(
"%sStream.initialize() may only be called in the NULL state"
% self.type.capitalize())
self.state = "INITIALIZING"
self.session = session
local_encryption_policy = session.account.rtp.encryption.key_negotiation if session.account.rtp.encryption.enabled else None
if hasattr(self, "_incoming_remote_sdp") and hasattr(
self, '_incoming_stream_index'):
# ICE attributes could come at the session level or at the media level
remote_stream = self._incoming_remote_sdp.media[
self._incoming_stream_index]
self._try_ice = self.session.account.nat_traversal.use_ice and (
(remote_stream.has_ice_attributes
or self._incoming_remote_sdp.has_ice_attributes)
and remote_stream.has_ice_candidates)
if "zrtp-hash" in remote_stream.attributes:
incoming_stream_encryption = 'zrtp'
elif "crypto" in remote_stream.attributes:
incoming_stream_encryption = 'sdes_mandatory' if remote_stream.transport == 'RTP/SAVP' else 'sdes_optional'
else:
incoming_stream_encryption = None
if incoming_stream_encryption is not None and local_encryption_policy == 'opportunistic':
self._srtp_encryption = incoming_stream_encryption
else:
self._srtp_encryption = 'zrtp' if local_encryption_policy == 'opportunistic' else local_encryption_policy
else:
self._try_ice = self.session.account.nat_traversal.use_ice
self._srtp_encryption = 'zrtp' if local_encryption_policy == 'opportunistic' else local_encryption_policy
if self._try_ice:
if self.session.account.nat_traversal.stun_server_list:
stun_servers = list(
(server.host, server.port) for server in
self.session.account.nat_traversal.stun_server_list)
self._init_rtp_transport(stun_servers)
elif not isinstance(self.session.account, BonjourAccount):
dns_lookup = DNSLookup()
self.notification_center.add_observer(self,
sender=dns_lookup)
dns_lookup.lookup_service(
SIPURI(self.session.account.id.domain), "stun")
else:
self._init_rtp_transport()
