[LAD] Re: Status of Pipewire

On 2023-02-08 04:03, Lorenzo Sutton wrote: Yes, however, the packaging is ever changing so what I have to say may be true for some people and not for others. At some point (ubuntu 22.04 here but already different in for 23.04) both pulse and pipewire are installed and set up in systemd so that if pulse is enabled, it takes the resources first and pipewire fails to start. So disabling pulse with systemctl (as a user not root) will switch to pipewire at least for desktop use. If the right (wrong?) pipewire-jack (not sure the right package name and it is changing anyway) package is installed, a file is created in /etc/ld.so.conf.d/ that basically tells the system that libjack is located in /usr/lib/*/pipewire*/jack/. This means that any jack client will use this lib and connect to pw instead of jack. This includes jackd(bus), jack_control, etc. To start jackd(bus) one must first remove /etc/ld.so.conf.d/*pipewire* and do an ldcoonfig (both as root of course). Then there is a pw configuration change that should make pw bridge to jackd... I haven't got so far as seeing how that works. I can (via script) change between a system that runs pulse/jack and a system that runs pipewire so far. However life has been busy and I have not played with it enough to say more. This does not seem possible. There is some sort of pw/jack bridge but there can only ever be one (that I can tell) and it will only ever have a number of ports automatically determined by PW rather than the very flexible modules listed above. Hopefully that changes. It is supposed to be possible to either: use pw for desktop with a bridge to jack for deterministic audio or use pw as jack and use jackd as a device. The second would require running jackd(bus) from a script that points jackd(bus) at the right libjack. so far PW has been reasonably good for desktop and jack functions for me except for Ardour exports where freerun is required. I am running it at 1024 buffer size only though because... the ALSA FW stack seems limited compared to ffado. ALSA fw seems limited to 256/2 and above where ffado will run reliably at 16/2. When I say limited to 256/2 I mean that jackd using the alsa fw stack with crash if the latency is set lower. As such, I have an interest in being able to use jackd in a PW environment, not so I can run at 16/2 but at least low enough to use my computer as a guitar effect in real time which pw does not allow. -- Len Ovens www.OvenWerks.net