JackAudio June 2020

jackaudio@lists.linuxaudio.org

7 participants
6 discussions

by Bruno Vernay

Hi, I am trying to use properties, but I might be missing something: I tried multiple variations: jack_property -l Jack: JackClient::SetupDriverSync driver sem in flush mode Jack: JackLinuxFutex::Connect name = jack_sem.1002_default_jack-property Jack: Clock source : system clock via clock_gettime Jack: JackLibClient::Open name = jack-property refnum = 7 could not retrieve all properties jack_property -ps system:capture_1 http://jackaudio.org/metadata/pretty-name "Toto" Jack: JackClient::SetupDriverSync driver sem in flush mode Jack: JackLinuxFutex::Connect name = jack_sem.1002_default_jack-property Jack: Clock source : system clock via clock_gettime Jack: JackLibClient::Open name = jack-property refnum = 7 Jack: jack_set_property ext_client 246af040 client 246af040 cannot set value for key Toto of system:capture_1 jack_property -p -s system:capture_1 "Toto" http://jackaudio.org/metadata/pretty-name Jack: JackClient::SetupDriverSync driver sem in flush mode Jack: JackLinuxFutex::Connect name = jack_sem.1002_default_jack-property Jack: Clock source : system clock via clock_gettime Jack: JackLibClient::Open name = jack-property refnum = 7 Jack: jack_set_property ext_client 51646040 client 51646040 cannot set value for key http://jackaudio.org/metadata/pretty-name of system:capture_1 I am using jack-audio-connection-kit-1.9.14-2 Bruno

4 years, 10 months

jack & Ableton - Windows

by Giovanni

Hi people, I am writing because I am experiencing a strange issue. I had a setup with Jack PortAudio (& Jack Control) for Windows, i opened them before (as admin), then opened Ableton and SuperCollider (also as admin) to bridge audio from one software to another. I also start Jack PortAudio with the following commands (going from Jack PortAudio -> Properties -> Shortcut -> Target): "C:\Program Files (x86)\Jack\jackd.exe" -R -P95 -Xwinmme -S -d portaudio -d "ASIO::US-2x2 & US-4x4" -r44100 -p512 I have been playing with this set-up from Jan to mid of March. Now I reopened my projects and something is wrong with that: when I play the test sine tone from Ableton, I can hear a sort of a Ring Mod, that is clearly a block size problem. I tried to switch block sizes - and sample rates - (both in JackControl and in the 'target' line of Jack PortAudio) but the only moment the test tone was playing kind of normally was once with 256 block size. But that time I had experienced a big problem: the sine tone was full of small clicks as my cpu was not handling it (which is really strange cause I normally have quite strong performances). So I really do not know what to do, also because this project was intended for my degree, which is tomorrow, but I have to rehearse this afternoon. Thanks for your attention Hope y'all are safe Respectfully Giovanni

4 years, 11 months

Help requested: SuspendRefNum error/JackClient::Execute error

by Sjoerd van Kreel

Hi all! I am the developer of XT-Audio (a project similar to PortAudio) which provides a unified interface to a couple of audio I/O backends on windows and linux, among them JACK. XT-Audio is implemented as a C interface to these backends, and on top of that, bindings for C++, .NET and Java. Along with the core library, I also provide a couple of sample programs (for each language) and a GUI demo application which is implemented in .NET only. The problem I currently run into is: when testing JACK using the GUI sample (a WinForms application, run using Mono), I run into the SuspendRefNum and JackClient::Execute errors immediately after starting an audio stream (jack_activate) and after this point the application becomes unstable. QJackCtl message window shows my app's ports being immediately disconnected and I receive "server not running" errors. However this ONLY happens when testing using my winforms demo app. I also provide a c++ console sample app (runs JACK fullduplex by just copying input to output) and a .NET sample console app which does the same thing. Both run without problems 100% of the time. So at first I tried to find the error in my winforms app, but i've been going through it for a couple of weeks now and can't seem to find anything obviously wrong with it. Errors mentioned at https://github.com/jackaudio/jack2/issues/307 look very similar to what i'm encountering but i'm not sure they are actually related. Are there any known problems that might cause the SuspendRefNum/JackClient::Execute error sequence? I'm kind of at a loss here and any help would be greatly appreciated. I'm running ubuntu 20.04 with jack 1.9.12. I also tried various things like running the demo app before starting the JACK server, the other way around, killing pulseaudio, using pasuspender etc, all to no avail. My XT-Audio project is at https://github.com/sjoerdvankreel/xt-audio. Binaries for the current version are at https://sjoerdvankreel.github.io/xt-audio. Don't know if it's of any help, but all of this used to run just fine under ubuntu 16.x (can't remember jack version). Best regards, Sjoerd <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…> Virus-free. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

4 years, 11 months

no audio through headphone jack

by Piscium

Hiya, My use case is this: I have a desktop with Arch, I play music on it using the desktop audio port at the back during the day, and at night I use headphones connected to a tiny USB sound card. This works with pulseaudio, but despite being a simple scenario pulseaudio is a bit flaky and sometimes hangs. So I went looking for an alternative solution. I know that Jack is for professional audio, not some basic home use, however I gave it a try. I used the instructions in the Arch and Jack wikis. I am using jack2 with Cadence and set up a bridge for pulseaudio to Jack. Some of players that I use have Jack outputs so I use it on them, example, Vlc, Audacious, Mixxx. For Firefox and other players without a Jack output I use the pulseaudio bridge. I have been using this for a day only and so far I am happy, it seems more reliable than pulseaudio. I do have to stop the jack server and the pulse audio bridge before suspending the computer, but that is fine with me (incidentally this suspending seems to trigger pulseaudio flakiness when not using jack). The sound quality seems better with Jack – not really surprising as it is professional audio! There is something I have not figured out. If I plug headphones on the 3.5 mm headphone port in the front of the desktop, the sound out of the back to the speakers stops, as normal in pulseaudio, however I don't get any sound on the headphones. I could not find in Cadence any port specific for the headphones. Another guy reported the same a few days ago on the Arch forum so it is not just me. Is there a solution for this?

4 years, 11 months

Mackie 1640i i/o ports not detected in claudia, works with catia.

by AreYouLoco?

Hi, I am using KXStudio repos on Debian Testing with Mackie 1640i firewire interface on Lenovo Thinkpad T420. I followed most of this https://wiki.linuxaudio.org/wiki/system_configuration to tune my system for audio work. I am starting JACKd with cadence automatically on boot. Everything seems to work fine with Ardour and even PulseAudio sink but when I run Catia (version 5:0.9.1 from kxrepos) it detects my FW device and shows I/O ports so I can patch connections but not showing the device and I/O ports in Claudia (version 5:0.9.1 from kxrepos). custom RT kernel 5.4.19-rt9-fw (I am using some patch to tune FIFO buffer on my firewire controller and get less xruns but same issue remains with stock debian RT kernel) with libffado 2.4.2-1. Here is log from jackd: https://del.dog/raw/jackd_log [GREP FOR THE ERROR LINES]. Possible important lines: ERROR: firewire MSG: Streaming thread running with Realtime scheduling, priority 30 ERROR: firewire MSG: Registering audio capture port firewire_pcm:000ff2050000145b_CH1_in If someone has some more experience with JACKd and know where to start debugging process please do post reply. Thanks in advance! AreYouLoco?

4 years, 11 months

Jack C++ midi structural considerations

by Stefan Schmelz

Hi everyone, As a word beforehand: I am a somewhat experienced C++ programmer but brand new to developing with Jack. I'm somewhat experienced in Using Jack audio tho. I am rather ambitious and don't want to make stupid beginners mistakes so I often ask super basic (some times really dumb) questions. I will briefly talk about my current project so you maybe can suggest something better or understand my thoughts better. I'm pretty shure most of you guys have heard of automation tools like autohotkey or something similar. I want to build such an automation tool but tailored for midi devices instead of keyboards. I want to have the ability to read information from a config file what so ever. Actually thinking about a config script of sorts, instead of json/yaml/toml files. (that's not the point tho) I also want to be able to process multiple midi controllers with one instance like autohotkey can have multiple instances running and supports multiple scripts per instance. I want to be able to register callbacks from the scripting engine that are called if a message is received. I want to support multiple instances of the same device (in my example I use novation Launchpads). I want to be able to have a function setup the device. For example change modes or setup basic elements or ensure the device will have the right firmware version for the script. (if the device supports it) I want the Program to appear as one Jack client with one input and one Output per midi device and optionally stereo outputs per Device. Now I want to talk about my thoughts about the structure of my program: First of all I will be working with C++14 or C++17. And want to get it working at all before making it multithreaded and efficient. I have some kind of main Class that is responsible for reading the main config file/script and creates a vector of Device Objects. I will call this main Class DeviceManager. The device manager will run the main process function of jack. It will receive midi events from all devices and will pass a vector of vectors with raw midi data to the process function per device. The Device object keeps a registry of callbacks and will call them from its process function. If I want to Send midi data or audio data to the Hardware it will push vectors of raw midi data onto a queue and the process function will flush the queue of one device per call. I will have to implement my own midi clock per device (that controls the blink and fade speed on the launchpad. It may be useful on other controllers too.) Now my real questions: Would it be better to have the Device manager pass a reference to the Devices and run every Device in its own thread with its own process function? How would I check if a external jack port exists? So it can wait until for example a device is plugged in and comes up or a program is started. What is the most effective way to send larger amounts of midi data? Is there a good C++ wrapper around jack that would save me some work? I already know about juice but I deemed it to big for the things I would use it for. Best regards Stefan Schmelz

4 years, 11 months

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JackAudio June 2020