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import fractions
import math
import sys
from unittest import TestCase
from aiortc import rtp
from aiortc.rtcrtpparameters import RTCRtpHeaderExtensionParameters, RTCRtpParameters
from aiortc.rtp import (
RtcpByePacket,
RtcpPacket,
RtcpPsfbPacket,
RtcpRrPacket,
RtcpRtpfbPacket,
RtcpSdesPacket,
RtcpSrPacket,
RtpPacket,
clamp_packets_lost,
pack_header_extensions,
pack_packets_lost,
pack_remb_fci,
unpack_header_extensions,
unpack_packets_lost,
unpack_remb_fci,
unwrap_rtx,
wrap_rtx,
)
from av import AudioFrame
from .utils import load
def create_audio_frame(sample_func, samples, pts, layout="mono", sample_rate=48000):
frame = AudioFrame(format="s16", layout=layout, samples=samples)
for p in frame.planes:
buf = bytearray()
for i in range(samples):
sample = int(sample_func(i) * 32767)
buf.extend(int.to_bytes(sample, 2, sys.byteorder, signed=True))
p.update(buf)
frame.pts = pts
frame.sample_rate = sample_rate
frame.time_base = fractions.Fraction(1, sample_rate)
return frame
class RtcpPacketTest(TestCase):
def test_bye(self):
data = load("rtcp_bye.bin")
packets = RtcpPacket.parse(data)
self.assertEqual(len(packets), 1)
packet = packets[0]
self.assertIsInstance(packet, RtcpByePacket)
self.assertEqual(packet.sources, [2924645187])
self.assertEqual(bytes(packet), data)
self.assertEqual(repr(packet), "RtcpByePacket(sources=[2924645187])")
def test_bye_invalid(self):
data = load("rtcp_bye_invalid.bin")
with self.assertRaises(ValueError) as cm:
RtcpPacket.parse(data)
self.assertEqual(str(cm.exception), "RTCP bye length is invalid")
def test_bye_no_sources(self):
data = load("rtcp_bye_no_sources.bin")
packets = RtcpPacket.parse(data)
self.assertEqual(len(packets), 1)
packet = packets[0]
self.assertIsInstance(packet, RtcpByePacket)
self.assertEqual(packet.sources, [])
self.assertEqual(bytes(packet), data)
self.assertEqual(repr(packet), "RtcpByePacket(sources=[])")
def test_bye_only_padding(self):
data = load("rtcp_bye_padding.bin")
packets = RtcpPacket.parse(data)
self.assertEqual(len(packets), 1)
packet = packets[0]
self.assertIsInstance(packet, RtcpByePacket)
self.assertEqual(packet.sources, [])
self.assertEqual(bytes(packet), b"\x80\xcb\x00\x00")
self.assertEqual(repr(packet), "RtcpByePacket(sources=[])")
def test_bye_only_padding_zero(self):
data = load("rtcp_bye_padding.bin")[0:4] + b"\x00\x00\x00\x00"
with self.assertRaises(ValueError) as cm:
RtcpPacket.parse(data)
self.assertEqual(str(cm.exception), "RTCP packet padding length is invalid")
def test_psfb_invalid(self):
data = load("rtcp_psfb_invalid.bin")
with self.assertRaises(ValueError) as cm:
RtcpPacket.parse(data)
self.assertEqual(
str(cm.exception), "RTCP payload-specific feedback length is invalid"
)
def test_psfb_pli(self):
data = load("rtcp_psfb_pli.bin")
packets = RtcpPacket.parse(data)
self.assertEqual(len(packets), 1)
packet = packets[0]
self.assertIsInstance(packet, RtcpPsfbPacket)
self.assertEqual(packet.fmt, 1)
self.assertEqual(packet.ssrc, 1414554213)
self.assertEqual(packet.media_ssrc, 587284409)
self.assertEqual(packet.fci, b"")
self.assertEqual(bytes(packet), data)
def test_rr(self):
data = load("rtcp_rr.bin")
packets = RtcpPacket.parse(data)
self.assertEqual(len(packets), 1)
packet = packets[0]
self.assertIsInstance(packet, RtcpRrPacket)
self.assertEqual(packet.ssrc, 817267719)
self.assertEqual(packet.reports[0].ssrc, 1200895919)
self.assertEqual(packet.reports[0].fraction_lost, 0)
self.assertEqual(packet.reports[0].packets_lost, 0)
self.assertEqual(packet.reports[0].highest_sequence, 630)
self.assertEqual(packet.reports[0].jitter, 1906)
self.assertEqual(packet.reports[0].lsr, 0)
self.assertEqual(packet.reports[0].dlsr, 0)
self.assertEqual(bytes(packet), data)
def test_rr_invalid(self):
data = load("rtcp_rr_invalid.bin")
with self.assertRaises(ValueError) as cm:
RtcpPacket.parse(data)
self.assertEqual(str(cm.exception), "RTCP receiver report length is invalid")
def test_rr_truncated(self):
data = load("rtcp_rr.bin")
for length in range(1, 4):
with self.assertRaises(ValueError) as cm:
RtcpPacket.parse(data[0:length])
self.assertEqual(
str(cm.exception), "RTCP packet length is less than 4 bytes"
)
for length in range(4, 32):
with self.assertRaises(ValueError) as cm:
RtcpPacket.parse(data[0:length])
self.assertEqual(str(cm.exception), "RTCP packet is truncated")
def test_sdes(self):
data = load("rtcp_sdes.bin")
packets = RtcpPacket.parse(data)
self.assertEqual(len(packets), 1)
packet = packets[0]
self.assertIsInstance(packet, RtcpSdesPacket)
self.assertEqual(packet.chunks[0].ssrc, 1831097322)
self.assertEqual(
packet.chunks[0].items, [(1, b"{63f459ea-41fe-4474-9d33-9707c9ee79d1}")]
)
self.assertEqual(bytes(packet), data)
def test_sdes_item_truncated(self):
data = load("rtcp_sdes_item_truncated.bin")
with self.assertRaises(ValueError) as cm:
RtcpPacket.parse(data)
self.assertEqual(str(cm.exception), "RTCP SDES item is truncated")
def test_sdes_source_truncated(self):
data = load("rtcp_sdes_source_truncated.bin")
with self.assertRaises(ValueError) as cm:
RtcpPacket.parse(data)
self.assertEqual(str(cm.exception), "RTCP SDES source is truncated")
def test_sr(self):
data = load("rtcp_sr.bin")
packets = RtcpPacket.parse(data)
self.assertEqual(len(packets), 1)
packet = packets[0]
self.assertIsInstance(packet, RtcpSrPacket)
self.assertEqual(packet.ssrc, 1831097322)
self.assertEqual(packet.sender_info.ntp_timestamp, 16016567581311369308)
self.assertEqual(packet.sender_info.rtp_timestamp, 1722342718)
self.assertEqual(packet.sender_info.packet_count, 269)
self.assertEqual(packet.sender_info.octet_count, 13557)
self.assertEqual(len(packet.reports), 1)
self.assertEqual(packet.reports[0].ssrc, 2398654957)
self.assertEqual(packet.reports[0].fraction_lost, 0)
self.assertEqual(packet.reports[0].packets_lost, 0)
self.assertEqual(packet.reports[0].highest_sequence, 246)
self.assertEqual(packet.reports[0].jitter, 127)
self.assertEqual(packet.reports[0].lsr, 0)
self.assertEqual(packet.reports[0].dlsr, 0)
self.assertEqual(bytes(packet), data)
def test_sr_invalid(self):
data = load("rtcp_sr_invalid.bin")
with self.assertRaises(ValueError) as cm:
RtcpPacket.parse(data)
self.assertEqual(str(cm.exception), "RTCP sender report length is invalid")
def test_rtpfb(self):
data = load("rtcp_rtpfb.bin")
packets = RtcpPacket.parse(data)
self.assertEqual(len(packets), 1)
packet = packets[0]
self.assertIsInstance(packet, RtcpRtpfbPacket)
self.assertEqual(packet.fmt, 1)
self.assertEqual(packet.ssrc, 2336520123)
self.assertEqual(packet.media_ssrc, 4145934052)
self.assertEqual(
packet.lost,
[12, 32, 39, 54, 76, 110, 123, 142, 183, 187, 223, 236, 271, 292],
)
self.assertEqual(bytes(packet), data)
def test_rtpfb_invalid(self):
data = load("rtcp_rtpfb_invalid.bin")
with self.assertRaises(ValueError) as cm:
RtcpPacket.parse(data)
self.assertEqual(str(cm.exception), "RTCP RTP feedback length is invalid")
def test_compound(self):
data = load("rtcp_sr.bin") + load("rtcp_sdes.bin")
packets = RtcpPacket.parse(data)
self.assertEqual(len(packets), 2)
self.assertIsInstance(packets[0], RtcpSrPacket)
self.assertIsInstance(packets[1], RtcpSdesPacket)
def test_bad_version(self):
data = b"\xc0" + load("rtcp_rr.bin")[1:]
with self.assertRaises(ValueError) as cm:
RtcpPacket.parse(data)
self.assertEqual(str(cm.exception), "RTCP packet has invalid version")
class RtpPacketTest(TestCase):
def test_dtmf(self):
data = load("rtp_dtmf.bin")
packet = RtpPacket.parse(data)
self.assertEqual(packet.version, 2)
self.assertEqual(packet.marker, 1)
self.assertEqual(packet.payload_type, 101)
self.assertEqual(packet.sequence_number, 24152)
self.assertEqual(packet.timestamp, 4021352124)
self.assertEqual(packet.csrc, [])
self.assertEqual(packet.extensions, rtp.HeaderExtensions())
self.assertEqual(len(packet.payload), 4)
self.assertEqual(packet.serialize(), data)
def test_no_ssrc(self):
data = load("rtp.bin")
packet = RtpPacket.parse(data)
self.assertEqual(packet.version, 2)
self.assertEqual(packet.marker, 0)
self.assertEqual(packet.payload_type, 0)
self.assertEqual(packet.sequence_number, 15743)
self.assertEqual(packet.timestamp, 3937035252)
self.assertEqual(packet.csrc, [])
self.assertEqual(packet.extensions, rtp.HeaderExtensions())
self.assertEqual(len(packet.payload), 160)
self.assertEqual(packet.serialize(), data)
self.assertEqual(
repr(packet),
"RtpPacket(seq=15743, ts=3937035252, marker=0, payload=0, 160 bytes)",
)
def test_padding_only(self):
data = load("rtp_only_padding.bin")
packet = RtpPacket.parse(data)
self.assertEqual(packet.version, 2)
self.assertEqual(packet.marker, 0)
self.assertEqual(packet.payload_type, 120)
self.assertEqual(packet.sequence_number, 27759)
self.assertEqual(packet.timestamp, 4044047131)
self.assertEqual(packet.csrc, [])
self.assertEqual(packet.extensions, rtp.HeaderExtensions())
self.assertEqual(len(packet.payload), 0)
self.assertEqual(packet.padding_size, 224)
serialized = packet.serialize()
self.assertEqual(len(serialized), len(data))
self.assertEqual(serialized[0:12], data[0:12])
self.assertEqual(serialized[-1], data[-1])
def test_padding_only_with_header_extensions(self):
extensions_map = rtp.HeaderExtensionsMap()
extensions_map.configure(
RTCRtpParameters(
headerExtensions=[
RTCRtpHeaderExtensionParameters(
id=2,
uri="http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time",
)
]
)
)
data = load("rtp_only_padding_with_header_extensions.bin")
packet = RtpPacket.parse(data, extensions_map)
self.assertEqual(packet.version, 2)
self.assertEqual(packet.marker, 0)
self.assertEqual(packet.payload_type, 98)
self.assertEqual(packet.sequence_number, 22138)
self.assertEqual(packet.timestamp, 3171065731)
self.assertEqual(packet.csrc, [])
self.assertEqual(
packet.extensions, rtp.HeaderExtensions(abs_send_time=15846540)
)
self.assertEqual(len(packet.payload), 0)
self.assertEqual(packet.padding_size, 224)
serialized = packet.serialize(extensions_map)
self.assertEqual(len(serialized), len(data))
self.assertEqual(serialized[0:20], data[0:20])
self.assertEqual(serialized[-1], data[-1])
def test_padding_too_long(self):
data = load("rtp_only_padding.bin")[0:12] + b"\x02"
with self.assertRaises(ValueError) as cm:
RtpPacket.parse(data)
self.assertEqual(str(cm.exception), "RTP packet padding length is invalid")
def test_padding_zero(self):
data = load("rtp_only_padding.bin")[0:12] + b"\x00"
with self.assertRaises(ValueError) as cm:
RtpPacket.parse(data)
self.assertEqual(str(cm.exception), "RTP packet padding length is invalid")
def test_with_csrc(self):
data = load("rtp_with_csrc.bin")
packet = RtpPacket.parse(data)
self.assertEqual(packet.version, 2)
self.assertEqual(packet.marker, 0)
self.assertEqual(packet.payload_type, 0)
self.assertEqual(packet.sequence_number, 16082)
self.assertEqual(packet.timestamp, 144)
self.assertEqual(packet.csrc, [2882400001, 3735928559])
self.assertEqual(packet.extensions, rtp.HeaderExtensions())
self.assertEqual(len(packet.payload), 160)
self.assertEqual(packet.serialize(), data)
def test_with_csrc_truncated(self):
data = load("rtp_with_csrc.bin")
for length in range(12, 20):
with self.assertRaises(ValueError) as cm:
RtpPacket.parse(data[0:length])
self.assertEqual(str(cm.exception), "RTP packet has truncated CSRC")
def test_with_sdes_mid(self):
extensions_map = rtp.HeaderExtensionsMap()
extensions_map.configure(
RTCRtpParameters(
headerExtensions=[
RTCRtpHeaderExtensionParameters(
id=9, uri="urn:ietf:params:rtp-hdrext:sdes:mid"
)
]
)
)
data = load("rtp_with_sdes_mid.bin")
packet = RtpPacket.parse(data, extensions_map)
self.assertEqual(packet.version, 2)
self.assertEqual(packet.marker, 1)
self.assertEqual(packet.payload_type, 111)
self.assertEqual(packet.sequence_number, 14156)
self.assertEqual(packet.timestamp, 1327210925)
self.assertEqual(packet.csrc, [])
self.assertEqual(packet.extensions, rtp.HeaderExtensions(mid="0"))
self.assertEqual(len(packet.payload), 54)
self.assertEqual(packet.serialize(extensions_map), data)
def test_with_sdes_mid_truncated(self):
data = load("rtp_with_sdes_mid.bin")
for length in range(12, 16):
with self.assertRaises(ValueError) as cm:
RtpPacket.parse(data[0:length])
self.assertEqual(
str(cm.exception), "RTP packet has truncated extension profile / length"
)
for length in range(16, 20):
with self.assertRaises(ValueError) as cm:
RtpPacket.parse(data[0:length])
self.assertEqual(
str(cm.exception), "RTP packet has truncated extension value"
)
def test_truncated(self):
data = load("rtp.bin")[0:11]
with self.assertRaises(ValueError) as cm:
RtpPacket.parse(data)
self.assertEqual(str(cm.exception), "RTP packet length is less than 12 bytes")
def test_bad_version(self):
data = b"\xc0" + load("rtp.bin")[1:]
with self.assertRaises(ValueError) as cm:
RtpPacket.parse(data)
self.assertEqual(str(cm.exception), "RTP packet has invalid version")
class RtpUtilTest(TestCase):
def test_clamp_packets_lost(self):
self.assertEqual(clamp_packets_lost(-8388609), -8388608)
self.assertEqual(clamp_packets_lost(-8388608), -8388608)
self.assertEqual(clamp_packets_lost(0), 0)
self.assertEqual(clamp_packets_lost(8388607), 8388607)
self.assertEqual(clamp_packets_lost(8388608), 8388607)
def test_pack_packets_lost(self):
self.assertEqual(pack_packets_lost(-8388608), b"\x80\x00\x00")
self.assertEqual(pack_packets_lost(-1), b"\xff\xff\xff")
self.assertEqual(pack_packets_lost(0), b"\x00\x00\x00")
self.assertEqual(pack_packets_lost(1), b"\x00\x00\x01")
self.assertEqual(pack_packets_lost(8388607), b"\x7f\xff\xff")
def test_pack_remb_fci(self):
# exponent = 0, mantissa = 0
data = pack_remb_fci(0, [2529072847])
self.assertEqual(data, b"REMB\x01\x00\x00\x00\x96\xbe\x96\xcf")
# exponent = 0, mantissa = 0x3ffff
data = pack_remb_fci(0x3FFFF, [2529072847])
self.assertEqual(data, b"REMB\x01\x03\xff\xff\x96\xbe\x96\xcf")
# exponent = 1, mantissa = 0
data = pack_remb_fci(0x40000, [2529072847])
self.assertEqual(data, b"REMB\x01\x06\x00\x00\x96\xbe\x96\xcf")
data = pack_remb_fci(4160000, [2529072847])
self.assertEqual(data, b"REMB\x01\x13\xf7\xa0\x96\xbe\x96\xcf")
# exponent = 63, mantissa = 0x3ffff
data = pack_remb_fci(0x3FFFF << 63, [2529072847])
self.assertEqual(data, b"REMB\x01\xff\xff\xff\x96\xbe\x96\xcf")
def test_unpack_packets_lost(self):
self.assertEqual(unpack_packets_lost(b"\x80\x00\x00"), -8388608)
self.assertEqual(unpack_packets_lost(b"\xff\xff\xff"), -1)
self.assertEqual(unpack_packets_lost(b"\x00\x00\x00"), 0)
self.assertEqual(unpack_packets_lost(b"\x00\x00\x01"), 1)
self.assertEqual(unpack_packets_lost(b"\x7f\xff\xff"), 8388607)
def test_unpack_remb_fci(self):
# junk
with self.assertRaises(ValueError):
unpack_remb_fci(b"JUNK")
# exponent = 0, mantissa = 0
bitrate, ssrcs = unpack_remb_fci(b"REMB\x01\x00\x00\x00\x96\xbe\x96\xcf")
self.assertEqual(bitrate, 0)
self.assertEqual(ssrcs, [2529072847])
# exponent = 0, mantissa = 0x3ffff
bitrate, ssrcs = unpack_remb_fci(b"REMB\x01\x03\xff\xff\x96\xbe\x96\xcf")
self.assertEqual(bitrate, 0x3FFFF)
self.assertEqual(ssrcs, [2529072847])
# exponent = 1, mantissa = 0
bitrate, ssrcs = unpack_remb_fci(b"REMB\x01\x06\x00\x00\x96\xbe\x96\xcf")
self.assertEqual(bitrate, 0x40000)
self.assertEqual(ssrcs, [2529072847])
# 4160000 bps
bitrate, ssrcs = unpack_remb_fci(b"REMB\x01\x13\xf7\xa0\x96\xbe\x96\xcf")
self.assertEqual(bitrate, 4160000)
self.assertEqual(ssrcs, [2529072847])
# exponent = 63, mantissa = 0x3ffff
bitrate, ssrcs = unpack_remb_fci(b"REMB\x01\xff\xff\xff\x96\xbe\x96\xcf")
self.assertEqual(bitrate, 0x3FFFF << 63)
self.assertEqual(ssrcs, [2529072847])
def test_unpack_header_extensions(self):
# none
self.assertEqual(unpack_header_extensions(0, None), [])
# one-byte, value
self.assertEqual(unpack_header_extensions(0xBEDE, b"\x900"), [(9, b"0")])
# one-byte, value, padding, value
self.assertEqual(
unpack_header_extensions(0xBEDE, b"\x900\x00\x00\x301"),
[(9, b"0"), (3, b"1")],
)
# one-byte, value, value
self.assertEqual(
unpack_header_extensions(0xBEDE, b"\x10\xc18sdparta_0"),
[(1, b"\xc1"), (3, b"sdparta_0")],
)
# two-byte, value
self.assertEqual(unpack_header_extensions(0x1000, b"\xff\x010"), [(255, b"0")])
# two-byte, value (1 byte), padding, value (2 bytes)
self.assertEqual(
unpack_header_extensions(0x1000, b"\xff\x010\x00\xf0\x0212"),
[(255, b"0"), (240, b"12")],
)
def test_unpack_header_extensions_bad(self):
# one-byte, value (truncated)
with self.assertRaises(ValueError) as cm:
unpack_header_extensions(0xBEDE, b"\x90")
self.assertEqual(
str(cm.exception), "RTP one-byte header extension value is truncated"
)
# two-byte (truncated)
with self.assertRaises(ValueError) as cm:
unpack_header_extensions(0x1000, b"\xff")
self.assertEqual(
str(cm.exception), "RTP two-byte header extension is truncated"
)
# two-byte, value (truncated)
with self.assertRaises(ValueError) as cm:
unpack_header_extensions(0x1000, b"\xff\x020")
self.assertEqual(
str(cm.exception), "RTP two-byte header extension value is truncated"
)
def test_pack_header_extensions(self):
# none
self.assertEqual(pack_header_extensions([]), (0, b""))
# one-byte, single value
self.assertEqual(
pack_header_extensions([(9, b"0")]), (0xBEDE, b"\x900\x00\x00")
)
# one-byte, two values
self.assertEqual(
pack_header_extensions([(1, b"\xc1"), (3, b"sdparta_0")]),
(0xBEDE, b"\x10\xc18sdparta_0"),
)
# two-byte, single value
self.assertEqual(
pack_header_extensions([(255, b"0")]), (0x1000, b"\xff\x010\x00")
)
def test_map_header_extensions(self):
data = bytearray(
[
0x90,
0x64,
0x00,
0x58,
0x65,
0x43,
0x12,
0x78,
0x12,
0x34,
0x56,
0x78, # SSRC
0xBE,
0xDE,
0x00,
0x08, # Extension of size 8x32bit words.
0x40,
0xDA, # AudioLevel.
0x22,
0x01,
0x56,
0xCE, # TransmissionOffset.
0x62,
0x12,
0x34,
0x56, # AbsoluteSendTime.
0x81,
0xCE,
0xAB, # TransportSequenceNumber.
0xA0,
0x03, # VideoRotation.
0xB2,
0x12,
0x48,
0x76, # PlayoutDelayLimits.
0xC2,
0x72,
0x74,
0x78, # RtpStreamId
0xD5,
0x73,
0x74,
0x72,
0x65,
0x61,
0x6D, # RepairedRtpStreamId
0x00,
0x00, # Padding to 32bit boundary.
]
)
extensions_map = rtp.HeaderExtensionsMap()
extensions_map.configure(
RTCRtpParameters(
headerExtensions=[
RTCRtpHeaderExtensionParameters(
id=2, uri="urn:ietf:params:rtp-hdrext:toffset"
),
RTCRtpHeaderExtensionParameters(
id=4, uri="urn:ietf:params:rtp-hdrext:ssrc-audio-level"
),
RTCRtpHeaderExtensionParameters(
id=6,
uri="http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time",
),
RTCRtpHeaderExtensionParameters(
id=8,
uri="http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01",
),
RTCRtpHeaderExtensionParameters(
id=12, uri="urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id"
),
RTCRtpHeaderExtensionParameters(
id=13,
uri="urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id",
),
]
)
)
packet = RtpPacket.parse(data, extensions_map)
# check mapped values
self.assertEqual(packet.extensions.abs_send_time, 0x123456)
self.assertEqual(packet.extensions.audio_level, (True, 90))
self.assertEqual(packet.extensions.mid, None)
self.assertEqual(packet.extensions.repaired_rtp_stream_id, "stream")
self.assertEqual(packet.extensions.rtp_stream_id, "rtx")
self.assertEqual(packet.extensions.transmission_offset, 0x156CE)
self.assertEqual(packet.extensions.transport_sequence_number, 0xCEAB)
# TODO: check
packet.serialize(extensions_map)
def test_rtx(self):
extensions_map = rtp.HeaderExtensionsMap()
extensions_map.configure(
RTCRtpParameters(
headerExtensions=[
RTCRtpHeaderExtensionParameters(
id=9, uri="urn:ietf:params:rtp-hdrext:sdes:mid"
)
]
)
)
data = load("rtp_with_sdes_mid.bin")
packet = RtpPacket.parse(data, extensions_map)
# wrap / unwrap RTX
rtx = wrap_rtx(packet, payload_type=112, sequence_number=12345, ssrc=1234)
recovered = unwrap_rtx(rtx, payload_type=111, ssrc=4084547440)
# check roundtrip
self.assertEqual(recovered.version, packet.version)
self.assertEqual(recovered.marker, packet.marker)
self.assertEqual(recovered.payload_type, packet.payload_type)
self.assertEqual(recovered.sequence_number, packet.sequence_number)
self.assertEqual(recovered.timestamp, packet.timestamp)
self.assertEqual(recovered.ssrc, packet.ssrc)
self.assertEqual(recovered.csrc, packet.csrc)
self.assertEqual(recovered.extensions, packet.extensions)
self.assertEqual(recovered.payload, packet.payload)
def test_compute_audio_level_dbov(self):
num_samples = 960 # 20ms @ 48kHz
# test a frame of all zeroes (-127 dBov, the minimum value)
silent_frame = create_audio_frame(lambda n: 0.0, num_samples, 0)
self.assertEqual(rtp.compute_audio_level_dbov(silent_frame), -127)
# test a 50Hz square wave (0 dBov, the maximum value)
square_frame = create_audio_frame(
lambda n: 1.0 if n < num_samples / 2 else -1.0, num_samples, 0
)
self.assertEqual(rtp.compute_audio_level_dbov(square_frame), 0)
# test a 50Hz sine wave (-3 dBov, the maximum value for a sine wave)
sine_frame = create_audio_frame(
lambda n: math.sin(2 * math.pi * n / num_samples), num_samples, 0
)
self.assertEqual(rtp.compute_audio_level_dbov(sine_frame), -3)
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