Problem with buffer size and "clicking"

David Lake

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Jan 17, 2021, 4:55:13 AM1/17/21

to jacktrip-users

Hi

Re-sending as I don't think this made it out...

I’ve built a Raspberry PI with a HiFiBerry DAC+/ADC and I’m running my own Linode server as a hub.

To test loopback, I do this:

./jacktrip -S -p1

If the client is set to a sample size of 1024, that works.

If the client is set to a sample size of 128 the server gives me the error below. How do I set the jacktrip hub to accept a sample size of 128?

Also, when I am connected in loopback I have an intermittent clicking noise on the audio. I’ve spun-up a test server to compare and I don’t get the same issue so it is specific to my server.

Thanks

David

root@jitsimeet:~/jacktrip/builddir# ./jacktrip -S -p1

mThreadPool default maxThreadCount = 2

mThreadPool maxThreadCount set to 32

JackTrip HUB SERVER: UDP Base Port set to 61002

JackTrip HUB SERVER: TCP Server Listening in Port = 4464

JackTrip HUB SERVER: Waiting for client connections...

JackTrip HUB SERVER: Hub auto audio patch setting = 1

=======================================================

JackTrip HUB SERVER: Client Connection Received!

JackTrip HUB SERVER: Client Connect Received from Address : 2a00:23c4:3d04:da01:8db4:33f0:a316:dde6

JackTrip HUB SERVER: Reading UDP port from Client...

JackTrip HUB SERVER: Client UDP Port is = 4464

JackTrip HUB SERVER: Sending Final UDP Port to Client: 61002

JackTrip HUB SERVER: Client TCP Connection Closed!

JackTrip HUB SERVER: Spawning JackTripWorker...

JackTrip HUB SERVER: Starting JackTripWorker...

--->JackTripWorker: PeerNumChannels = 2

Cannot connect to server socket err = No such file or directory

Cannot connect to server request channel

jackdmp 1.9.12

jackdmp comes with ABSOLUTELY NO WARRANTY

This is free software, and you are welcome to redistribute it

under certain conditions; see the file COPYING for details

JACK server starting in realtime mode with priority 10

self-connect-mode is "Don't restrict self connect requests"

audio_reservation_init

Acquire audio card Audio0

creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit

configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods

ALSA: final selected sample format for capture: 16bit little-endian

ALSA: use 2 periods for capture

ALSA: final selected sample format for playback: 16bit little-endian

ALSA: use 2 periods for playback

JACK server started

Setting JACK Process Callback...

SUCCESS

---------------------------------------------------------

The Sampling Rate is: 48000

---------------------------------------------------------

The Audio Buffer Size is: 1024 samples

or: 4096 bytes

---------------------------------------------------------

The Number of Channels is: 2

---------------------------------------------------------

The RTAudio device ID is: 255

---------------------------------------------------------

Using UDP Protocol

---------------------------------------------------------

UDP Socket Receiving in Port: 61002

---------------------------------------------------------

Waiting for Peer...

JackTrip HUB SERVER: Total Running Threads: 1

===============================================================

ERROR: Peer Buffer Size is : 128

Local Buffer Size is : 1024

Make sure both machines use same buffer size

---------------------------------------------------------

Received Connection from Peer!

Stopping JackTrip...

spawning jacktripWorker so change patch

JackTemporaryException : now quits...

Jack main caught signal 2

JackTrip Processes STOPPED!

---------------------------------------------------------

releasing jacktripWorker so change patch

Released audio card Audio0

audio_reservation_finish

Cannot read socket fd = 9 err = Success

CheckRes error

JackSocketClientChannel read fail

Cannot connect to server socket err = No such file or directory

Cannot connect to server socket

Cannot connect to the server

JackShmReadWritePtr1::~JackShmReadWritePtr1 - Init not done for -1, skipping unlock

jack_client_open() failed, status = 0x%2.0x

33

QMutex: destroying locked mutex

root@jitsimeet:~/jacktrip/builddir#

Chris Chafe

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Jan 17, 2021, 1:01:07 PM1/17/21

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Before starting jacktrip on the server be sure to get jack running at the desired FPP setting (e.g., 128).

The session below shows the server spawning a connection but because it can't access an already running jackd process (either because it's not running or perms are wrong), jack tries to autostart using a default value (1024). That's a mismatch with the incoming client stream at 128, so jacktrip disconnected.

Chris

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david...@oca.ac.uk

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Jan 17, 2021, 5:50:26 PM1/17/21

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Thank you!

I created and /etc/jackdrc and put “/usr/bin/jackd -d dummy --rate 48000 --period 128” in it.

The difference is amazing – the latency to my server is about 7ms and with the session running in loopback there is virtually NO discernible delay at all.


David

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