On Fri, 7 Feb 2003, Clemens Ladisch wrote:
> Frank Neumann wrote:
> > PS: I checked with gettimeofday(): The snd_rawmidi_drain() takes about
> > 47-49ms on my system..quite long, huh? I mean, the command sequence is
> > just 7 bytes, that's about 2.24ms of "raw" MIDI transfer time..
>
> There are two possibilities how the _drain() can be implemented:
> 1) The driver knows when the FIFO is empty, and waits until then, or
> 2) Nothing is known, so ALSA simply waits for 50 ms.
>
> Currently, there isn't any driver which implements 1). :-(
Yes, you got it. I forgot this algorithm. Unfortunately, the most of cards
don't allow us to read the FIFO size / state, so it's a bit problematic to
determine the real time when all data are flushed to device.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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