Takashi Iwai wrote: >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.
Sorry, I don't get it. You mean update_avail will return a higher number of frames than snd_pcm_mmap_begin, so one has to mmap_begin a second time? That would be proceeding as usual. tim ------------------------------------------------------- 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
