>Paul, > So with -p 64 -n 2 settings, what number of bytes of audio data is >transferred across the PCI bus between each interrupt?
the period size is always (as with almost all ALSA metrics) in units of audio frames (1 sample for each channel). so with JACK running at -p 64, 64 frames of data are transferred. how many bytes that is depends on the sample width and the number of channels. > Also, does the number of bytes transferred change based on how many >channels are enabled? Or does my RME always transfer 26 channels of data >even if I am not using some channels? its hardware dependent. for the RME, the same amount is always moved, regardless of how many channels are enabled. in the case of the RME Hammerfall series, its more accurate to say that you cannot change the number of channels enabled. this is not true of all other hardware. > I am assuming that a card like the RME is a bus master, moves so many >bytes, and then interrupts to tell the system that the bytes are there. Is >this basically the case? yes. keep in mind that this only covers 1 direction: the interrupt also tells the system that its possible to put data into the "hardware buffer". --p ------------------------------------------------------- This SF.NET email is sponsored by: SourceForge Enterprise Edition + IBM + LinuxWorld = Something 2 See! http://www.vasoftware.com _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
