On Tuesday 11 February 2003 16.10, Silver Blade wrote: > I thought it'd be great if you could have the different plugin and > audio/MIDI I/O technologies supported by some sort of universal > host, which could be shared among processes - similar to how > Windows sockets are implemented (ie, it manages sockets and > provides apps with them.) This would mean you could share inputs > and outputs between apps (no more complaints about a MIDI device > being already open by another app!) and also that the only thing > that would differ from program to program is the GUI layout, > really. I had this in mind for MAIA, but I doubt it will work in real life. It's basically what JACK and ReWire do, although the latter doesn't=20 really run the "apps" in different processes, AFAIK. The problem is that most general purpose operating systems are=20 incapable of doing this kind of communication while guaranteeing=20 usable and reliable latency. It can be done on Linux/lowlatency and=20 probably also BeOS and a few other media oriented operating systems,=20 but as it is, you can forget about it on Win32. That said, as long as you never need to pass data with real time=20 constraints between apps and the "universal host", you're fine.=20 However, that reduces all apps to pure GUIs, and I suspect that many=20 developers just won't buy that concept. Just for starters, it means major extra trouble if you want to do some=20 off-line processing. Should the universal host provide features for=20 that as well, or do you have to load and host the plugins yourself,=20 specifically for this job? I think the JACK way is the only right way, but unfortunately, we=20 can't do it that way on the major platforms. It requires better=20 schedulers in the operating systems. BTW, note that JACK doesn't allow applications to run asynchronously,=20 with different audio block sizes. This is not really a limitation of=20 JACK, but rather a *requirement* for low latency processing. The=20 read()/write() model just don't work for low latency DSP, and that's=20 not fixable in any way, not even with RTLinux, RTAI, QNX or some=20 other hard RTOS. //David Olofson - Programmer, Composer, Open Source Advocate =2E- The Return of Audiality! --------------------------------. | Free/Open Source Audio Engine for use in Games or Studio. | | RT and off-line synth. Scripting. Sample accurate timing. | `---------------------------> http://olofson.net/audiality -' --- http://olofson.net --- http://www.reologica.se --- ---------------------------------------------------------------------- Generalized Music Plugin Interface (GMPI) public discussion list Participation in this list is contingent upon your abiding by the following rules: Please stay on topic. You are responsible for your own words. Please respect your fellow subscribers. Please do not redistribute anyone else's words without their permission. Archive: //www.freelists.org/archives/gmpi Email gmpi-request@xxxxxxxxxxxxx w/ subject "unsubscribe" to unsubscribe