Re: [PD] Multi-input USB audio into Raspberry Pi
FWIW forcing USB 1 mode works for some soundcards, but not for those that require asynchronous communication (my Roland UA-25). I'm glad it works for this device, but most of us are still out in the cold. The RPI has some inherent compromises for the goal of the project (cheap, general purpose computing) but I really wish they had added a dedicated USB controller! On Feb 3, 2014, at 2:50 AM, pd-list-requ...@iem.at wrote: From: Brian Fay ovaltinevor...@gmail.com Subject: Re: [PD] Multi-input USB audio into Raspberry Pi Date: February 3, 2014 at 2:49:54 AM EST To: Simon Wise simonzw...@gmail.com Cc: pd-list pd-list@iem.at In case anyone looks at this thread, I'd better mention that it seems that using CCRMA's distribution fixes my audio problems with the Behringer UCG102. I had been using the standard Raspbian distro when I wrote my comment. I believe that distribution uses a different kernel than Satellite CCRMA, which is optimized more for embedded audio projects. I had been unable to do duplex audio at 44100hz (had to switch to 32000), but now it seems to work fine (even when running pd with an X11-forwarded GUI). There's no noticeable dropouts at a latency of 10ms, at least in my initial testing! In order to get this to work, I simply had to change the text of /boot/cmdline.txt to the text politely included in /boot/cmdline-usb1.1-only.txt (thanks, Stanford guys!) Anyway, just hoping I haven't led anybody astray from the Pi with my earlier (somewhat misinformed) comment. I'd still be a little wary of using devices with more channels or without linux drivers. -Brian Dan Wilcox @danomatika danomatika.com robotcowboy.com ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Multi-input USB audio into Raspberry Pi
In case anyone looks at this thread, I'd better mention that it seems that using CCRMA's distribution fixes my audio problems with the Behringer UCG102. I had been using the standard Raspbian distro when I wrote my comment. I believe that distribution uses a different kernel than Satellite CCRMA, which is optimized more for embedded audio projects. I had been unable to do duplex audio at 44100hz (had to switch to 32000), but now it seems to work fine (even when running pd with an X11-forwarded GUI). There's no noticeable dropouts at a latency of 10ms, at least in my initial testing! In order to get this to work, I simply had to change the text of /boot/cmdline.txt to the text politely included in /boot/cmdline-usb1.1-only.txt (thanks, Stanford guys!) Anyway, just hoping I haven't led anybody astray from the Pi with my earlier (somewhat misinformed) comment. I'd still be a little wary of using devices with more channels or without linux drivers. -Brian On Fri, Jan 24, 2014 at 5:07 AM, Simon Wise simonzw...@gmail.com wrote: On 24/01/14 01:52, Chris McCormick wrote: Hi all, I might be really pushing my luck here, what with all the reports of audio issues on the Pi, but has anyone heard of somebody getting multi-input audio working with a multi-input USB 2.0 audio device? I have a dream of running one of these mixers (which does 8 channel audio out over USB 2.0) into Pd and being able to manipulate all of the channels from the mixer in Pd: http://www.alesis.com/multimix8usb20 given they need audio drivers for windows and mac I don't like your chances on linux, let alone a Pi, except perhaps the USB1.1 mode with 2-in 2-out. Apparently the esi gigaport hd+ does 8 channels OUT from the Pis, but I have not heard of any devices working with 8 IN. By the way ... finished my degree and I'm now in Sydney, if you're heading this side of he country sometime let me know. Simon ___ 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
Re: [PD] Multi-input USB audio into Raspberry Pi
On 24/01/14 01:52, Chris McCormick wrote: Hi all, I might be really pushing my luck here, what with all the reports of audio issues on the Pi, but has anyone heard of somebody getting multi-input audio working with a multi-input USB 2.0 audio device? I have a dream of running one of these mixers (which does 8 channel audio out over USB 2.0) into Pd and being able to manipulate all of the channels from the mixer in Pd: http://www.alesis.com/multimix8usb20 given they need audio drivers for windows and mac I don't like your chances on linux, let alone a Pi, except perhaps the USB1.1 mode with 2-in 2-out. Apparently the esi gigaport hd+ does 8 channels OUT from the Pis, but I have not heard of any devices working with 8 IN. By the way ... finished my degree and I'm now in Sydney, if you're heading this side of he country sometime let me know. Simon ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
[PD] Multi-input USB audio into Raspberry Pi
Hi all, I might be really pushing my luck here, what with all the reports of audio issues on the Pi, but has anyone heard of somebody getting multi-input audio working with a multi-input USB 2.0 audio device? I have a dream of running one of these mixers (which does 8 channel audio out over USB 2.0) into Pd and being able to manipulate all of the channels from the mixer in Pd: http://www.alesis.com/multimix8usb20 Cheers, Chris. -- http://mccormick.cx/ ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Multi-input USB audio into Raspberry Pi
Hey Jaime, On 24/01/14 01:48, Jaime E Oliver wrote: there was a thread on this just a while back and someone reported multiple inputs, I cannot find it right now, but it;s there! I spent a fair bit of time reading back through the archives and various other sources yesterday and I did see mention of someone running four inputs but a later post seemed to contradict what they'd said, and I couldn't find anything on pd-list about that in particular. Would love to be wrong about that of course! In any case, I will report back here if successful. Cheers, Chris. -- http://mccormick.cx/ ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Multi-input USB audio into Raspberry Pi
I don't want to discourage you, but from my experience there's definitely some things to be wary of with the Raspberry Pi. For example, a lot of people have reported needing to use USB 2.0 devices in USB 1.1 mode. I don't know if this would necessarily hinder the functionality of the device, but it seems like it could be a nuisance. Personally, I've been using an interface with a single stereo input and output (Behringer UCG102) for my guitar. Performance for that device has been fairly satisfactory, but there are some problems I can't seem to resolve... I get buffer xruns every ten seconds or so when running PD, even in -nogui mode with realtime priorities. This sounds like a little pop, a one sample impulse, and while it's not unplayable, it is annoying. I am running at a pretty low latency (~8ms, which is awesome), but even raising the latency a little and messing around with the signal vector size doesn't seem to help stop the popping. Also, while it's not super important for my guitar processing, I've been unable to run duplex audio at a samplerate higher than 32kHz. It seems that this is related to an issue in newer versions of the kernel (there's an issue posted here: https://github.com/raspberrypi/firmware/issues/197). I don't know anything about Operating System code, so I have no idea if this could be addressed somehow. So while I can't say that multi-channel input and output won't work, I will say that even stereo I/O is a little broken. I wonder if the BeagleBone xM would be better for this project? It is a bit pricier, but it seems like Stanford CCRMA students have had some success with it (more than the Pi, anyway) Check out this link for examples of that: https://ccrma.stanford.edu/~eberdahl/satellite/ Good luck, Brian On Thu, Jan 23, 2014 at 7:31 PM, Chris McCormick ch...@mccormick.cx wrote: Hey Jaime, On 24/01/14 01:48, Jaime E Oliver wrote: there was a thread on this just a while back and someone reported multiple inputs, I cannot find it right now, but it;s there! I spent a fair bit of time reading back through the archives and various other sources yesterday and I did see mention of someone running four inputs but a later post seemed to contradict what they'd said, and I couldn't find anything on pd-list about that in particular. Would love to be wrong about that of course! In any case, I will report back here if successful. Cheers, Chris. -- http://mccormick.cx/ ___ 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
