def test_packet_with_recovery(self):
midi_list = [[[128, 10, 0], 1000], [[144, 32, 110], 1000]]
recovery_journal_system = RecoveryJournal()
seq = 12
#midi session part (sending)
packet = OldPacket(seq, midi_list, 0)
midi_list_formated, length = MidiCommand().encode_midi_commands(
midi_list)
header = MidiCommand().header(0, 1, 0, 0, length)
#Building Chunk
recovery_journal_system.update(packet)
recovery_journal = recovery_journal_system.content
chunk = header + midi_list_formated + recovery_journal
#protocol part
packet = RTPPacket(424242, seq, 10, chunk, 96, marker=1)
bytes = packet.netbytes()
packet = parse_rtppacket(bytes)
#midisession part (receiving)
marker_b, marker_j, marker_z, marker_p, length = MidiCommand(
).parse_header(packet.data[0])
if marker_p:
#silent packet with recovery
midi_list = []
else:
#normal packet
#Extract Midi Note (length en nb notes)
print "test 1:", len(packet.data[1:length * 7 + 1])
midi_list = packet.data[1:length * 7 + 1]
#Decoding midi commands
midi_list = MidiCommand().decode_midi_commands(midi_list, length)
#Saving feed history
packet_to_save = OldPacket(seq, midi_list, 0)
#Extract Midi Recovery Journal if is present in the packet and
#the previous packet has been lost
if marker_j:
print "recovery journal"
print len(packet.data[length * 7 + 1:])
journal = packet.data[length * 7 + 1:]
#Parse Recovery journal
r_journal = recovery_journal_system.parse(journal)
def test_packet_with_recovery(self):
midi_list = [[[128, 10, 0], 1000],
[[144, 32, 110], 1000]]
recovery_journal_system = RecoveryJournal()
seq = 12
#midi session part (sending)
packet = OldPacket(seq, midi_list, 0)
midi_list_formated, length = MidiCommand().encode_midi_commands(midi_list)
header = MidiCommand().header(0, 1, 0, 0, length)
#Building Chunk
recovery_journal_system.update(packet)
recovery_journal = recovery_journal_system.content
chunk = header + midi_list_formated + recovery_journal
#protocol part
packet = RTPPacket(424242, seq, 10, chunk, 96, marker=1)
bytes = packet.netbytes()
packet = parse_rtppacket(bytes)
#midisession part (receiving)
marker_b, marker_j, marker_z, marker_p, length = MidiCommand().parse_header(packet.data[0])
if marker_p :
#silent packet with recovery
midi_list = []
else:
#normal packet
#Extract Midi Note (length en nb notes)
print "test 1:", len(packet.data[1:length*7+1])
midi_list = packet.data[1:length*7+1]
#Decoding midi commands
midi_list = MidiCommand().decode_midi_commands(midi_list, length)
#Saving feed history
packet_to_save = OldPacket(seq, midi_list, 0)
#Extract Midi Recovery Journal if is present in the packet and
#the previous packet has been lost
if marker_j:
print "recovery journal"
print len(packet.data[length*7+1:])
journal = packet.data[length*7+1:]
#Parse Recovery journal
r_journal = recovery_journal_system.parse(journal)
def datagramReceived(self, datagram, addr, t=time):
"""Handle packets arriving"""
if self.rport == 0:
return
if not self.checksum(datagram):
if VERBOSE:
print "Warning: Packet received with wrong checksum RTP"
return
#parse the packet
packet = parse_rtppacket(datagram)
#Checking SSRC
ssrc = packet.header.ssrc
if ssrc in self.RTCP.members_table:
cname = self.RTCP.members_table[ssrc]['cname']
else:
cname = ""
if not self.RTCP.check_ssrc(ssrc, addr, "DATA", cname):
if VERBOSE:
print "Warning: Bad SSRC leaving packet on the floor"
return
else:
#Update last_seq and lastreceivetime
self.RTCP.members_table[ssrc]['total_received_bytes'] += len(
datagram)
self.RTCP.members_table[ssrc]['total_received_packets'] += 1
self.RTCP.members_table[ssrc]['last_rtp_receive'] = time()
if self.RTCP.members_table[ssrc]['last_seq'] != 0:
if packet.data == "p":
#Silent without recovery
if DEBUG:
print "silent packet received"
#self.RTCP.members_table[ssrc]['last_seq'] += 1
return
#Testing payload type TODO erase this test
if packet.header.pt == self.payload:
if DEBUG:
print "payload of packet accepted"
#Getting stats
last_ts = self.RTCP.members_table[ssrc]['last_ts']
last_time = self.RTCP.members_table[ssrc]['last_time']
jitter = self.RTCP.members_table[ssrc]['jitter']
#Jitter calculation (rfc 3550 6.4.1)
#S = RTP Timestamp and R is time of arrival
if (last_ts == 0 and last_time == 0) \
or ( (int(time()*1000 - self.init_time) \
- last_time) > JITTER_CALC_TIME_OUT ):
last_ts = packet.header.ts
last_time = int(time() * 1000 - self.init_time)
else:
arrival_time = int(time() * 1000 - self.init_time)
timestamp = packet.header.ts
delta = float(( arrival_time - last_time ) \
- ( timestamp - last_ts ))
jitter = jitter \
+ ( abs(delta) - jitter ) / 16
self.RTCP.members_table[ssrc]['last_ts'] = timestamp
last_time = self.RTCP.members_table[ssrc][
'last_time'] = arrival_time
self.RTCP.members_table[ssrc]['jitter_values'].to_list(
jitter)
self.RTCP.members_table[ssrc]['jitter'] = jitter
if self.RTCP.members_table[ssrc][
'total_received_packets'] % CHECK_FREQ == 0:
if DEBUG:
print "Estimate jitter time"
jitter_average = self.RTCP.members_table[ssrc][
'jitter_values'].average()
total_received = self.RTCP.members_table[ssrc][
'total_received_packets']
#Lost rate estimation
lost = self.RTCP.members_table[ssrc]['lost']
lost_rate = (lost / float(total_received + lost)) * 100
#Keep this ?
if lost_rate > MAX_LOST_RATE:
if VERBOSE:
line = "Loosing too much packet !!"
print line
#Adjusting latency (based on round trip time/jitter)
#self.test_jitter()
#self.test_delay()
#Adding packet to the jitter buffer
if DEBUG:
print "Adding packet to jitter buffer"
self.jitter_buffer.add([packet, time() * 1000])
else:
if VERBOSE:
print "Incompatible payload type"
else:
#this is the first packet
if VERBOSE:
line = "First RTP packet received from " + str(addr)
print line
self.RTCP.members_table[ssrc]['last_seq'] = packet.header.seq
def datagramReceived(self, datagram, addr, t=time):
"""Handle packets arriving"""
if self.rport == 0:
return
if not self.checksum(datagram):
if VERBOSE:
print "Warning: Packet received with wrong checksum RTP"
return
#parse the packet
packet = parse_rtppacket(datagram)
#Checking SSRC
ssrc = packet.header.ssrc
if ssrc in self.RTCP.members_table:
cname = self.RTCP.members_table[ssrc]['cname']
else:
cname = ""
if not self.RTCP.check_ssrc(ssrc, addr, "DATA", cname):
if VERBOSE:
print "Warning: Bad SSRC leaving packet on the floor"
return
else:
#Update last_seq and lastreceivetime
self.RTCP.members_table[ssrc]['total_received_bytes'] += len(datagram)
self.RTCP.members_table[ssrc]['total_received_packets'] += 1
self.RTCP.members_table[ssrc]['last_rtp_receive'] = time()
if self.RTCP.members_table[ssrc]['last_seq'] != 0 :
if packet.data == "p":
#Silent without recovery
if DEBUG :
print "silent packet received"
#self.RTCP.members_table[ssrc]['last_seq'] += 1
return
#Testing payload type TODO erase this test
if packet.header.pt == self.payload:
if DEBUG:
print "payload of packet accepted"
#Getting stats
last_ts = self.RTCP.members_table[ssrc]['last_ts']
last_time = self.RTCP.members_table[ssrc]['last_time']
jitter = self.RTCP.members_table[ssrc]['jitter']
#Jitter calculation (rfc 3550 6.4.1)
#S = RTP Timestamp and R is time of arrival
if (last_ts == 0 and last_time == 0) \
or ( (int(time()*1000 - self.init_time) \
- last_time) > JITTER_CALC_TIME_OUT ):
last_ts = packet.header.ts
last_time = int(time()*1000 - self.init_time)
else:
arrival_time = int(time()*1000 - self.init_time)
timestamp = packet.header.ts
delta = float(( arrival_time - last_time ) \
- ( timestamp - last_ts ))
jitter = jitter \
+ ( abs(delta) - jitter ) / 16
self.RTCP.members_table[ssrc]['last_ts'] = timestamp
last_time = self.RTCP.members_table[ssrc]['last_time'] = arrival_time
self.RTCP.members_table[ssrc]['jitter_values'].to_list(jitter)
self.RTCP.members_table[ssrc]['jitter'] = jitter
if self.RTCP.members_table[ssrc]['total_received_packets'] % CHECK_FREQ == 0:
if DEBUG:
print "Estimate jitter time"
jitter_average = self.RTCP.members_table[ssrc]['jitter_values'].average()
total_received = self.RTCP.members_table[ssrc]['total_received_packets']
#Lost rate estimation
lost = self.RTCP.members_table[ssrc]['lost']
lost_rate = (lost / float(total_received + lost)) * 100
#Keep this ?
if lost_rate > MAX_LOST_RATE :
if VERBOSE:
line = "Loosing too much packet !!"
print line
#Adjusting latency (based on round trip time/jitter)
#self.test_jitter()
#self.test_delay()
#Adding packet to the jitter buffer
if DEBUG:
print "Adding packet to jitter buffer"
self.jitter_buffer.add([packet, time()*1000])
else:
if VERBOSE:
print "Incompatible payload type"
else:
#this is the first packet
if VERBOSE:
line = "First RTP packet received from " + str(addr)
print line
self.RTCP.members_table[ssrc]['last_seq'] = packet.header.seq