At Tue, 20 Aug 2002 13:34:03 +0200 (CEST), Tim Goetze wrote: > > Takashi Iwai wrote: > > >> With the current setup and cycle code for mmap'd IO (like Jack for > >> example does it), is it possible to use these devices at all? > > > >on 48kHz my usb speaker worked fine with 1ms or 2ms period size (not > >under high loads, though), since the frames per urb becomes integer in > >this case. on 44.1kHz xrun could happen. > > Yeah, a differing number of frames/cycle makes things hairy. But if > one sets a period size of 45/90 frames/cycle and accepts 44/88/89 as > well, things should work OK, shouldn't they?
well... for that, you have to know how much data to be written _before_ actually you writing it. i.e. you need an extra step, query the (rest) period size -> then write/read, instead of always writing the same amount of data. > >> What kind of hw/sw params, especially period size, should one set? > > > >the frequency aligned to 1000Hz. > > You mean divided by 1000, rounded up to the nearest integer, right? yes. Takashi ------------------------------------------------------- This sf.net email is sponsored by: OSDN - Tired of that same old cell phone? Get a new here for FREE! https://www.inphonic.com/r.asp?r=sourceforge1&refcode1=vs3390 _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
