Re: [linux-audio-dev] Audio synchronization, MIDI API

Quoting John Check <j4strngs(a)bitless.net>et>: I'm alive And the world shines for me today... (ELO) Sorry, I haven't been able to keep up with the list, much to my regret... But don't worry, I'll be back! Anyway, lowlat audio over ethernet works and the ethernet delays are negligible in practice, they are on the order of a few hundred microsseconds *with retransmits* in practice and most of the time they won't even happen. Please take a quick look at http://gsd.ime.usp.br/~lago/masters/artigo-webmidia.pdf . It is small and most of the text may be skipped (but please note the "sliding windows" stuff). As for resampling and resyncing multiple cards, that's more complicated... Quoting Benno Senoner <sbenno(a)gardena.net>et>: Definitely right. AND udp is simpler to use and allows for packets up to 64K; the resulting ethernet fragmentation, apparently, doesn't have a significant impact on performance either. This all tested with relatively low-end hardware. I didn't try, but I guess this system only works well (with lowlat) in a LAN. Again, that's right. If the net is dedicated, there should be virtually no ethernet packet loss; but even if there is, the hardware retransmits fast enough (IIRC, on the order of nanoseconds) for that to be transparent. There are four important TODO things with my code: - remove the CORBA stuff; it is a legacy from a past where I intended corba to have a much more important role, but right now it only gives us the ability to discover the nodes available, which would be much easier with multicast/broadcast. - clear up the C++ code so that it compiles with g++ 3.x. - create a simple gui for the manager (should be eeeeasy). - improve error handling (calling exit() at any error is not the best way to go ;-) See ya, Nelson ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.