openairplay/airplay2-receiver

Distorted Audio iPhone to macOS

Closed this issue · 3 comments

tiziano149 commented

The problem

Hello openairplay community,

I'm trying to run airplay2-receiver on macOS 12.2.1.
Installed it like this:

brew install python3
brew install portaudio
virtualenv -p /usr/local/bin/python3 proto
source proto/bin/activate
pip install -r requirements.txt
pip install --global-option=build_ext --global-option="-I/usr/local/Cellar/portaudio/19.6.0/include" --global-option="-L/usr/local/Cellar/portaudio/19.6.0/lib" pyaudio

python ap2-receiver.py -m myap2 --netiface=en0

Managed to get it running, name shows up as "none" on my iPhone which seems weird but works.
Audio playback is distorted and jagged and breaks down after around 30s.

Any Ideas?

Thank you very much

Tiziano

[Receiver]: Name: None
[Receiver]: Enabled features: 0001c300405f4200
[Receiver]: FeatureFlags.Ft48TransientPairing|Ft47PeerManagement|Ft46HomeKitPairing|Ft41_PTPClock|Ft40BufferedAudio|Ft30UnifiedAdvertisingInfo|Ft22AudioUnencrypted|Ft20ReceiveAudioAAC_LC|Ft19ReceiveAudioALAC|Ft18ReceiveAudioPCM|Ft17AudioMetaTxtDAAP|Ft16AudioMetaProgress|Ft14MFiSoft_FairPlay|Ft09AirPlayAudio
[Receiver]: Interface: en0
[Receiver]: Mac: 24:4f:27:5c:8b:b2
[Receiver]: IPv4: 192.168.178.20
[Receiver]: IPv6: fe70::1c23:b1e4:3b9f:611d
[Receiver]:
[asyncio]: Using selector: KqueueSelector
[Receiver]: mDNS: service registered
[Receiver]: Starting RTSP server, press Ctrl-C to exit...
[Receiver]: serving on 192.168.178.20:7000
[AP2Server: 192.168.178.20:7000]: Opened connection from 192.168.178.21:50315
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: {'qualifier': ['txtAirPlay']}
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: Sending our device info
[AP2Server: 192.168.178.20:7000]: Thread-2: Opened HAPSocket from 192.168.178.21:50315
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: SETUP: rtsp://192.168.178.20/6306729490375921051
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]:
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: GET_PARAMETER: rtsp://192.168.178.20/6306729490375921051
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: GET_PARAMETER: b'volume'
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: RECORD: rtsp://192.168.178.20/6306729490375921051
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: SETPEERS: rtsp://192.168.178.20/6306729490375921051
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: ['192.168.178.20', '192.168.178.21', 'fe80::85f:6486:795a:c12b']
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: SETUP: rtsp://192.168.178.20/6306729490375921051
[utils] removing StreamHandler from Audio.debug file logger
[Audio.debug] file logging level: DEBUG
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]:
[asyncio]: Using selector: KqueueSelector
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: SET_PARAMETER: rtsp://192.168.178.20/6306729490375921051
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: SET_PARAMETER: b'progress' => b' 633735024/650449316/647859945'
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: FLUSH: rtsp://192.168.178.20/6306729490375921051
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: SET_PARAMETER: rtsp://192.168.178.20/6306729490375921051
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: DMAP:
dmap.persistentid: 0x49922e063b9651f0
daap.songalbum: Lonerism
daap.songartist: Tame Impala
dmap.itemname: Sun's Coming Up

[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: SET_PARAMETER: rtsp://192.168.178.20/6306729490375921051
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: DMAP:
dmap.persistentid: 0x49922e063b9651f0
daap.songalbum: Lonerism
daap.songartist: Tame Impala
dmap.itemname: Sun's Coming Up
dacp.playerstate: Playing

[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: SET_PARAMETER: rtsp://192.168.178.20/6306729490375921051
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: SET_PARAMETER: b'progress' => b' 637874142/650455300/651999063'
[AudioRealtime]: audioDevicelatency (sec): 0.00108
[AudioRealtime]: pyAudioDelay (sec): 0.00447
[AudioRealtime]: Total sample_delay (sec): 0.00755
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: SET_PARAMETER: rtsp://192.168.178.20/6306729490375921051
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: SET_PARAMETER: b'volume' => b' -15.075000'
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: SET_PARAMETER: rtsp://192.168.178.20/6306729490375921051
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: SET_PARAMETER: b'volume' => b' -16.950001'
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: SET_PARAMETER: rtsp://192.168.178.20/6306729490375921051
[AP2Handler: 192.168.178.20:7000<=>192.168.178.21:50315; Thread-2]: SET_PARAMETER: b'volume' => b' -18.825001'
[AudioRealtime]: requesting resend of sequence_no 47621; amt 7
[AudioRealtime]: requesting resend of sequence_no 47635; amt 7

[AudioRealtime]: requesting resend of sequence_no 49789; amt 2
Exception in thread Thread-2: (relative to self)
Traceback (most recent call last):
File "/usr/local/Cellar/python@3.9/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/threading.py", line 973, in _bootstrap_inner
self.run()
File "/usr/local/Cellar/python@3.9/3.9.10/Frameworks/Python.framework/Versions/3.9/lib/python3.9/threading.py", line 910, in run
self._target(*self._args, **self._kwargs)
File "/Users/tiziano/Downloads/airplay2-receiver-master/ap2/connections/audio.py", line 738, in play
pkt = RTP_REALTIME(data)
File "/Users/tiziano/Downloads/airplay2-receiver-master/ap2/connections/audio.py", line 123, in init
fbit = extra_hdr[0] & 0b10000000
IndexError: index out of range
[AudioRealtime]: requesting resend of sequence_no 49798; amt 1
[AudioRealtime]: requesting resend of sequence_no 49807; amt 7

What commit exhibits the issue?

master

Was there a last known working commit?

No response

What type of installation are you running?

virtualenv

With which python3 version do you run Receiver?

python3

OS the receiver runs on

macOS 12.2.1

OS the sender runs

iPhone iOS 13

Which sender client was used

Spotify

Command invocation

python ap2-receiver.py -m myap2 --netiface=en0

Please include --debug output which helps to illustrate the problem

No response

Additional information

No response

systemcrash commented

At last - a coherent bug report :)

I would hazard a guess that your WiFi channel is very noisy. real-time playback is most sensitive and susceptible to packet loss, which the log messages requesting resend indicate. If it's possible to have your receiver device on a wired connection, many problems should disappear. People with noisy WiFi areas (built up residential blocks) might suffer, here.

What's weird is the trace-back indicates that you are in a code-path unreachable if you are not using a flag for audio redundancy, which is off by default. This suggests a corrupted packet arrived...? I will put packet handling within a try..except clause to improve things there.

You might also look in audio around line 520 for

        audioDevicelatency = \
            self.pa.get_default_output_device_info()['defaultLowOutputLatency']

and change to defaultHighOutputLatency if any problems persist.

systemcrash commented

What is your router - and does it have WMM extensions on?
Curious also ios subversion.

Neustradamus commented

@tiziano149: Have you seen the last comment of @systemcrash?