Pedro Lopez-Cabanillas wrote: > On Tuesday 11 March 2003 18:36, Clemens Ladisch wrote: > > Jordi Mallach wrote: > > > any comment on the last "stacatto" bug I reported after the big > > > report? > > > > I couldn't reproduce it on my machine (current CVS instead of 0.9.0beta8, > > 2.4.18 instead of 2.4.2, Roland Sound Canvas connected with USB instead of > > SB MIDI port). > > > > I have noticed that calling SNDCTL_SEQ_RESET (as well as close()ing the > > handle to /dev/music) sends "all notes off", "controller reset" and > > pitch-bend messages to all channels on all ports, but that should result > > in a delay of at most 40ms before the first note, and not in a timing > > problem at a later note. > > After that messages, there is a 0xfe (Active Sensing) message (the rawmidi > close() default policy). Running the test program with a Roland SC-88 > (connected with a MIDI cable to some interface drived by ALSA) it shows this > effect (first long note is clearly shortened). After the program reachs a > delay of about 300ms the problem is solved, so i think that the Active > Sensing can be guilty here.
Yes, that's it! My SC-8820 doesn't care for Active Sensing because the connection status is handled by the USB protocol. > I have to say that with my other external synth (an old Roland JV-80) the test > program runs fine (every note with the right length), but shows a "Midi > Communication Error" in it's LCD display. The SC-88 shows another error > message saying "Midi Off Line" every time a program close()s a rawmidi or OSS > device. One could say "This behaviour is by design", but that's a Microsoft quote. ;-) > I know that using ALSA rawmidi API, there is a function to prevent this, doing > something like this: > snd_rawmidi_params_set_no_active_sensing(handle_out, params, 1); > But, how to do something like that for OSS programs? (without fixing the OSS > program itself, of course) Neither OSS nor ALSA sequencer ports can change parameters of the underlying rawmidi port. Maybe there should be a module parameter for this. Regards, Clemens ------------------------------------------------------- This SF.net email is sponsored by:Crypto Challenge is now open! Get cracking and register here for some mind boggling fun and the chance of winning an Apple iPod: http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0031en _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
