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import asyncio
from struct import pack
from unittest import TestCase
from unittest.mock import patch
from aiortc import MediaStreamTrack
from aiortc.codecs import PCMU_CODEC
from aiortc.exceptions import InvalidStateError
from aiortc.mediastreams import AudioStreamTrack, VideoStreamTrack
from aiortc.rtcrtpparameters import (
RTCRtpCapabilities,
RTCRtpCodecCapability,
RTCRtpCodecParameters,
RTCRtpHeaderExtensionCapability,
RTCRtpParameters,
)
from aiortc.rtcrtpsender import RTCRtpSender
from aiortc.rtp import (
RTCP_PSFB_APP,
RTCP_PSFB_PLI,
RTCP_RTPFB_NACK,
RtcpPsfbPacket,
RtcpReceiverInfo,
RtcpRrPacket,
RtcpRtpfbPacket,
RtpPacket,
is_rtcp,
pack_remb_fci,
)
from aiortc.stats import RTCStatsReport
from tests.test_mediastreams import VideoPacketStreamTrack
from .utils import ClosedDtlsTransport, asynctest, dummy_dtls_transport_pair
VP8_CODEC = RTCRtpCodecParameters(
mimeType="video/VP8", clockRate=90000, payloadType=100
)
H264_CODEC = RTCRtpCodecParameters(
mimeType="video/H264", clockRate=90000, payloadType=98
)
class BuggyStreamTrack(MediaStreamTrack):
kind = "audio"
async def recv(self):
raise Exception("I'm a buggy track!")
class RTCRtpSenderTest(TestCase):
def test_capabilities(self):
# audio
capabilities = RTCRtpSender.getCapabilities("audio")
self.assertIsInstance(capabilities, RTCRtpCapabilities)
self.assertEqual(
capabilities.codecs,
[
RTCRtpCodecCapability(
mimeType="audio/opus", clockRate=48000, channels=2
),
RTCRtpCodecCapability(
mimeType="audio/PCMU", clockRate=8000, channels=1
),
RTCRtpCodecCapability(
mimeType="audio/PCMA", clockRate=8000, channels=1
),
],
)
self.assertEqual(
capabilities.headerExtensions,
[
RTCRtpHeaderExtensionCapability(
uri="urn:ietf:params:rtp-hdrext:sdes:mid"
),
RTCRtpHeaderExtensionCapability(
uri="urn:ietf:params:rtp-hdrext:ssrc-audio-level"
),
],
)
# video
capabilities = RTCRtpSender.getCapabilities("video")
self.assertIsInstance(capabilities, RTCRtpCapabilities)
self.assertEqual(
capabilities.codecs,
[
RTCRtpCodecCapability(mimeType="video/VP8", clockRate=90000),
RTCRtpCodecCapability(mimeType="video/rtx", clockRate=90000),
RTCRtpCodecCapability(
mimeType="video/H264",
clockRate=90000,
parameters={
"level-asymmetry-allowed": "1",
"packetization-mode": "1",
"profile-level-id": "42001f",
},
),
RTCRtpCodecCapability(
mimeType="video/H264",
clockRate=90000,
parameters={
"level-asymmetry-allowed": "1",
"packetization-mode": "1",
"profile-level-id": "42e01f",
},
),
],
)
self.assertEqual(
capabilities.headerExtensions,
[
RTCRtpHeaderExtensionCapability(
uri="urn:ietf:params:rtp-hdrext:sdes:mid"
),
RTCRtpHeaderExtensionCapability(
uri="http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time"
),
],
)
# bogus
with self.assertRaises(ValueError):
RTCRtpSender.getCapabilities("bogus")
@asynctest
async def test_construct(self):
async with dummy_dtls_transport_pair() as (local_transport, _):
sender = RTCRtpSender("audio", local_transport)
self.assertEqual(sender.kind, "audio")
self.assertEqual(sender.transport, local_transport)
def test_construct_invalid_dtls_transport_state(self):
dtlsTransport = ClosedDtlsTransport()
with self.assertRaises(InvalidStateError):
RTCRtpSender("audio", dtlsTransport)
@asynctest
async def test_connection_error(self):
"""
Close the underlying transport before the sender.
"""
async with dummy_dtls_transport_pair() as (local_transport, _):
sender = RTCRtpSender(AudioStreamTrack(), local_transport)
self.assertEqual(sender.kind, "audio")
await sender.send(RTCRtpParameters(codecs=[PCMU_CODEC]))
await local_transport.stop()
@asynctest
async def test_handle_rtcp_nack(self):
async with dummy_dtls_transport_pair() as (local_transport, _):
sender = RTCRtpSender(VideoStreamTrack(), local_transport)
self.assertEqual(sender.kind, "video")
await sender.send(RTCRtpParameters(codecs=[VP8_CODEC]))
# receive RTCP feedback NACK
packet = RtcpRtpfbPacket(
fmt=RTCP_RTPFB_NACK, ssrc=1234, media_ssrc=sender._ssrc
)
packet.lost.append(7654)
await sender._handle_rtcp_packet(packet)
# clean shutdown
await sender.stop()
@asynctest
async def test_handle_rtcp_pli(self):
async with dummy_dtls_transport_pair() as (local_transport, _):
sender = RTCRtpSender(VideoStreamTrack(), local_transport)
self.assertEqual(sender.kind, "video")
await sender.send(RTCRtpParameters(codecs=[VP8_CODEC]))
# receive RTCP feedback NACK
packet = RtcpPsfbPacket(
fmt=RTCP_PSFB_PLI, ssrc=1234, media_ssrc=sender._ssrc
)
await sender._handle_rtcp_packet(packet)
# clean shutdown
await sender.stop()
@asynctest
async def test_handle_rtcp_remb(self):
async with dummy_dtls_transport_pair() as (local_transport, _):
sender = RTCRtpSender(VideoStreamTrack(), local_transport)
self.assertEqual(sender.kind, "video")
await sender.send(RTCRtpParameters(codecs=[VP8_CODEC]))
# receive RTCP feedback REMB
packet = RtcpPsfbPacket(
fmt=RTCP_PSFB_APP,
ssrc=1234,
media_ssrc=0,
fci=pack_remb_fci(4160000, [sender._ssrc]),
)
await sender._handle_rtcp_packet(packet)
# receive RTCP feedback REMB (malformed)
packet = RtcpPsfbPacket(
fmt=RTCP_PSFB_APP, ssrc=1234, media_ssrc=0, fci=b"JUNK"
)
await sender._handle_rtcp_packet(packet)
# clean shutdown
await sender.stop()
@asynctest
async def test_handle_rtcp_rr(self):
async with dummy_dtls_transport_pair() as (local_transport, _):
sender = RTCRtpSender(VideoStreamTrack(), local_transport)
self.assertEqual(sender.kind, "video")
await sender.send(RTCRtpParameters(codecs=[VP8_CODEC]))
# receive RTCP RR
packet = RtcpRrPacket(
ssrc=1234,
reports=[
RtcpReceiverInfo(
ssrc=sender._ssrc,
fraction_lost=0,
packets_lost=0,
highest_sequence=630,
jitter=1906,
lsr=0,
dlsr=0,
)
],
)
await sender._handle_rtcp_packet(packet)
# check stats
report = await sender.getStats()
self.assertIsInstance(report, RTCStatsReport)
self.assertEqual(
sorted([s.type for s in report.values()]),
["outbound-rtp", "remote-inbound-rtp", "transport"],
)
# clean shutdown
await sender.stop()
@patch("aiortc.rtcrtpsender.logger.isEnabledFor")
@asynctest
async def test_log_debug(self, mock_is_enabled_for):
mock_is_enabled_for.return_value = True
async with dummy_dtls_transport_pair() as (local_transport, _):
sender = RTCRtpSender(VideoStreamTrack(), local_transport)
await sender.send(RTCRtpParameters(codecs=[VP8_CODEC]))
# clean shutdown
await sender.stop()
@asynctest
async def test_send_keyframe(self):
"""
Ask for a keyframe.
"""
queue = asyncio.Queue()
async def mock_send_rtp(data):
if not is_rtcp(data):
await queue.put(RtpPacket.parse(data))
async with dummy_dtls_transport_pair() as (local_transport, _):
local_transport._send_rtp = mock_send_rtp
sender = RTCRtpSender(VideoStreamTrack(), local_transport)
self.assertEqual(sender.kind, "video")
await sender.send(RTCRtpParameters(codecs=[VP8_CODEC]))
# wait for one packet to be transmitted, and ask for keyframe
await queue.get()
sender._send_keyframe()
# wait for packet to be transmitted, then shutdown
await asyncio.sleep(0.1)
await sender.stop()
@asynctest
async def test_handle_encoded_packet(self):
async with dummy_dtls_transport_pair() as (local_transport, _):
sender = RTCRtpSender(VideoPacketStreamTrack(), local_transport)
self.assertEqual(sender.kind, "video")
await sender.send(RTCRtpParameters(codecs=[H264_CODEC]))
# wait for cleanup
await asyncio.sleep(0.1)
await sender.stop()
@asynctest
async def test_retransmit(self):
"""
Ask for an RTP packet retransmission.
"""
queue = asyncio.Queue()
async def mock_send_rtp(data):
if not is_rtcp(data):
await queue.put(RtpPacket.parse(data))
async with dummy_dtls_transport_pair() as (local_transport, _):
local_transport._send_rtp = mock_send_rtp
sender = RTCRtpSender(VideoStreamTrack(), local_transport)
sender._ssrc = 1234
self.assertEqual(sender.kind, "video")
await sender.send(RTCRtpParameters(codecs=[VP8_CODEC]))
# wait for one packet to be transmitted, and ask to retransmit
packet = await queue.get()
await sender._retransmit(packet.sequence_number)
# wait for packet to be retransmitted, then shutdown
await asyncio.sleep(0.1)
await sender.stop()
# check packet was retransmitted
found_rtx = None
while not queue.empty():
queue_packet = queue.get_nowait()
if queue_packet.sequence_number == packet.sequence_number:
found_rtx = queue_packet
break
self.assertIsNotNone(found_rtx)
self.assertEqual(found_rtx.payload_type, 100)
self.assertEqual(found_rtx.ssrc, 1234)
@asynctest
async def test_retransmit_with_rtx(self):
"""
Ask for an RTP packet retransmission.
"""
queue = asyncio.Queue()
async def mock_send_rtp(data):
if not is_rtcp(data):
await queue.put(RtpPacket.parse(data))
async with dummy_dtls_transport_pair() as (local_transport, _):
local_transport._send_rtp = mock_send_rtp
sender = RTCRtpSender(VideoStreamTrack(), local_transport)
sender._ssrc = 1234
sender._rtx_ssrc = 2345
self.assertEqual(sender.kind, "video")
await sender.send(
RTCRtpParameters(
codecs=[
VP8_CODEC,
RTCRtpCodecParameters(
mimeType="video/rtx",
clockRate=90000,
payloadType=101,
parameters={"apt": 100},
),
]
)
)
# wait for one packet to be transmitted, and ask to retransmit
packet = await queue.get()
await sender._retransmit(packet.sequence_number)
# wait for packet to be retransmitted, then shutdown
await asyncio.sleep(0.1)
await sender.stop()
# check packet was retransmitted
found_rtx = None
while not queue.empty():
queue_packet = queue.get_nowait()
if queue_packet.payload_type == 101:
found_rtx = queue_packet
break
self.assertIsNotNone(found_rtx)
self.assertEqual(found_rtx.payload_type, 101)
self.assertEqual(found_rtx.ssrc, 2345)
self.assertEqual(found_rtx.payload[0:2], pack("!H", packet.sequence_number))
@asynctest
async def test_disabled(self):
async with dummy_dtls_transport_pair() as (local_transport, _):
sender = RTCRtpSender(AudioStreamTrack(), local_transport)
self.assertEqual(sender.kind, "audio")
self.assertEqual(sender._enabled, True)
await sender.send(RTCRtpParameters(codecs=[PCMU_CODEC]))
sender._enabled = False
self.assertEqual(sender._enabled, False)
# check stats
report = await sender.getStats()
self.assertIsInstance(report, RTCStatsReport)
self.assertEqual(
sorted([s.type for s in report.values()]),
["outbound-rtp", "transport"],
)
outbound_rtp = report["outbound-rtp_" + str(id(sender))]
self.assertEqual(outbound_rtp.packetsSent, 0)
# clean shutdown
await sender.stop()
@asynctest
async def test_stop(self):
async with dummy_dtls_transport_pair() as (local_transport, _):
sender = RTCRtpSender(AudioStreamTrack(), local_transport)
self.assertEqual(sender.kind, "audio")
await sender.send(RTCRtpParameters(codecs=[PCMU_CODEC]))
# clean shutdown
await sender.stop()
@asynctest
async def test_stop_before_send(self):
async with dummy_dtls_transport_pair() as (local_transport, _):
sender = RTCRtpSender(AudioStreamTrack(), local_transport)
await sender.stop()
@asynctest
async def test_stop_on_exception(self):
async with dummy_dtls_transport_pair() as (local_transport, _):
sender = RTCRtpSender(BuggyStreamTrack(), local_transport)
self.assertEqual(sender.kind, "audio")
await sender.send(RTCRtpParameters(codecs=[PCMU_CODEC]))
# clean shutdown
await sender.stop()
@asynctest
async def test_track_ended(self):
async with dummy_dtls_transport_pair() as (local_transport, _):
track = AudioStreamTrack()
sender = RTCRtpSender(track, local_transport)
await sender.send(RTCRtpParameters(codecs=[PCMU_CODEC]))
# stop track and wait for RTP loop to exit
track.stop()
await asyncio.sleep(0.1)
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