JACK is already much closer to the hardware than the networking stack. At the conclusion of the jack process callback, it writes samples *directly into the memory mapped buffer being used by the audio hardware*. The process callback is preemptively (and with realtime scheduling) triggered directly from the interrupt handler of the audio interface.
JACK does not use a round-robin approach to its clients. It creates a data (flow) graph based on their interconnections and executes them (serially or in parallel) in the order dictated by the graph. On Mon, Feb 19, 2018 at 5:57 PM, Jonathan Brickman <j...@ponderworthy.com> wrote: > Not really sure the subgraph is so good -- one of the things JACK gives us > is the extremely solid knowledge of what it just did, is doing now, and > will do next period. If I run Pulse with JACK, it's JACK controlling the > hardware and Pulse feeding into it, not the other way around, because Pulse > is not tightly synchronized, whereas JACK is. But if you can make it work > as well, more power to you. > > Concerning seeking and timing, though, I have had to wonder. My > impression of JACK for a long time (and more learned ladies and gentlemen, > please correct) is that it uses a basically round-robin approach to its > clients, with variation. I have had to wonder, especially given my need > for this <https://github.com/ponderworthy/MultiJACK>, how practical a > model might be possible, using preemptive multitasking or even > Ethernet-style collision avoidance through entropic data, at current CPU > speeds. It's chopped into frames, right? Couldn't audio and MIDI data be > mapped into networking frames and then thrown around using the kernel > networking stack? The timestamps are there...the connectivity is > there...have to do interesting translations... :-) Could be done at the IP > level or even lower I would think. The lower you go, the more power you > get, because you're closer to the kernel at every step. > > -- > *Jonathan E. Brickman j...@ponderworthy.com > <http://login.jsp/?at=02e47df3-a9af-4cd9-b951-1a06d255b48f&mailto=j...@ponderworthy.com> > (785)233-9977 > <(785)%20233-9977>* > *Hear us at http://ponderworthy.com <http://ponderworthy.com> -- CDs and > MP3s now available! <http://ponderworthy.com/ad-astra/ad-astra.html>* > *Music of compassion; fire, and life!!!* > > _______________________________________________ > Linux-audio-dev mailing list > Linux-audio-dev@lists.linuxaudio.org > https://lists.linuxaudio.org/listinfo/linux-audio-dev > >
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