great! thanks for all that info miller! let us know when you get USB input sounding good and how you did it.
cheers m On Sep 8, 2012, at 1:54 AM, Miller Puckette <m...@ucsd.edu> wrote: > To Pd list, > > I got my Pi in the mail today (only 2 or 3 weeks after ordering it I think - > they're starting to catch up with the enormous demand!) and can report what > I found works and what not. > > I loaded the Raspian distro (the one everyone suggests) and following the > blog on : > http://log.liminastudio.com/programming/running-puredata-on-the-raspberry-pi > > just typed > > pi@raspberrypi ~ $ sudo bash > root@raspberrypi:/home/pi# apt-get update > root@raspberrypi:/home/pi# apt-get install puredata > > and then pd ... sort of... runs right away. I had to fool with some > glitches though: > > 1. Pd is version 0.43-2 which doesn't yet know to try to promote itself > to real-time if it's not root. (This is only fixed in 0.44 which might not > make it to Raspian for quite some time.) A rather bad workaround exists: > still as root (i.e., after the "sudo" step) type > > root@raspberrypi:/home/pi# chmod 4775 /usr/bin/puredata > > This might be a security risk (if anyone breaks into your Pi they might be > able to design an exploit to get Pd to promote them to root) but I can't > say I'm worried about that. (Speaking of security though, since mine is > networked and ssh-enabled, I did change the password :) > > I'm having no trouble running Pd via ssh from another computer. The pi > user is already in group audio in the Raspian distro. X windows > forwarding is also turned on by default - so the only detail you have > to check is whether your ssh is rinngin with -X set on the originating > machine. I did notice that one can't run pd inside sudo and still get > X forwarding; you have to stay as the pi user. > > Then about audio. I can indeed verify that the built-in analogue audio is > wretched -- in two ways. First, it's not even functional (and LOUDLY non- > functional :) until you se the latency to at least 40 msec (it's 25 by > default in Pd on linux.) Second, it's bad anyway. To my ears the alsa > play program and Pd's test-tone sound equally bad. There's a modulation that > is sort of as if a sample out of every 1024 is getting dropped or doubled. > You can hear the modulation change as the pitch of the test tone goes up and > down. > > So I pulled out my cheapo USB headset from Gigaware and, with input turned > off, was able to play the test tone with latency down to 10 msec, and got a > clean-sounding tone out. Then, getting overconfident, I turned on audio > input and although the sound came through it has hiccups and my interface > froze (had to unplug the headphones to get Pd to bail :) > > So things are sort of working but there's still some tuning to do... I'll > probably have more to report over the weekend. > > cheers > Miller > > _______________________________________________ > Pd-list@iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list _______________________________________________ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
