Kuba,
I was working on a similar problem last weekend (see http://lists.puredata.info/pipermail/pd-list/2007-10/055005.html for the thread). If your problem is related to file i/o, and I think it might be, then any i/o that takes longer than one dsp block to complete will cause audio dropouts.
The good news is that you don't have to manually load everything into memory to avoid this; I had good success using a ram disk. This is better than pre-loading everything because your code doesn't have to change -- it still thinks it's loading from a hard drive. On OS X, at least, there are utilities that make setting up ram disks very easy (even allowing automatic read/write from disk for automatic persistence). Even without utilities, it's not hard to do on *nix (I don't know about Windows).
In many cases (all my cases), the ram disk speeds up the i/o enough to get things done in one DSP block -- thus, no dropouts.
I hope this can help you.
Phil Stone pkstonemusic.com
Kuba Szczypek wrote:
Thank you Derek,
Two instances I alerady tried, but sending by osc that many messages give me the same result (so it isn`t problem with scrollist). Of course I can put all modules/objects/patch related to keeping_song_names_in_memory and putting_this_names_to_scrollist on second instance, but this is serious complicating life.
Question: Of course we all love PD, but is this system only for learning? If I need to build good, stabillity, without any drops in audio (also when I read or write to disk) patch for have fun from playing/creating music - is puredata good choice or it`s better jump to another environment (like max)?
I`m open to change since most important for me is finally finish project with great result, and not waiting for update.
-rt flag I have all time, and running under root give no difference. If I good understand jack adding latency?
thank you Kuba
Dnia 19-10-2007 o godz. 13:48 Derek Holzer napisał(a):
Hi Kuba,
same problem as ever.... PD's GUI implementation is a bit crippled. My suggestion would be to run two instances of PD, one for the DSP running --nogui and one for the GUI running --noaudio. Communicate between via netsend or OSC. Check the archives for more tips on this.
As a workaround, you could also try a single instance of PD, running -rt as root. This cleared up some but not all of my GUI-related glitches on Linux.
My experiences were that ALSA+JACK worked best, but others (like Frank Barknecht) have reported that OSS (by this I assume OSS emulated by ALSA) worked better, or at least as good. I think. Again, search the archives, because that topic comes up very often on this list.
best, d.
Kuba Szczypek wrote:
Dear friends,
I have serious problem with my patch. It is hard to write it in proper English for me, but I have no choice - I must try,since I`m looking for help.
I would like to show (by scrollist) my list of titles 128 song names. But since I have small space for this on screen, I use only 8 lines in scrollist and "page up" page down" mechanism. I prepared patch who:
- first send 128 lines into memory of scrollist
- next I mark/unmark proper line.
But since I have only 8 line show on display , and list have 128 positions I often must change pages.
The problem is that changing pages cause drop. If I change very fast (by fader) from 0 to 127 (song nuber) many times and from 127 to 0 (again again) then I can see that screen is completely frozen and audio drop is very long (like about 3, 4 second). More moving I did = bigger drop and longer frozen screen.
When I do the same, but with fader on the screen, no problem there. Problem is only when I use external MIDI fader. (of course normally when I use any MIDI message it work great, problem is only with this setup: scrollist)
I tried change thread priority (pd and pd-gui) with many different combinations, but it not solved problem.
I use Ubuntu Studio with gnome, oss audio system. Pentium IV 2,4 512 ram Geforce mx 400 with TV out enabled.
I would like to ask also is oss better than alsa+jack or not? (I mean performance power).
Thank you
Paul Oakenfold - najdroższy DJ świata już 7 grudnia wystąpi w Hali Stulecia we Wrocławiu. Zobacz więcej: http://klik.wp.pl/?adr=http%3A%2F%2Fcorto.www.wp.pl%2Fas%2Fgaleria.html&...
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