[PD] Pd Vanilla on Raspberry Pi
sdiy-mz01 at blauwurf.info
Tue Aug 14 00:09:51 CEST 2012
On 13.8.2012, at 20:29 , Miller Puckette wrote:
> This is good news about the TASCAM devices (I see there's a whole series
> of them and they're cheap.) I've also heard that Presonous's interfaces
> are class compliant, but I've now forgotten who told me that.
> I read some months ago on the Raspberry Pi site that it should perform
> "about like a 300 mHz Pentium II" - and the fact that it runs the phase
> vocoder patch without running out of CPU cycles roughly confirms that.
I just checked the Phase Vocoder (compile of Pd-extended on Raspbian) via X11 redirect:
Pd eats about 68% CPU load running a 2k window.
A 4k window causes about 75% CPU load where occasional glitching occurs.
To avoid additional system load I tried to run it with -nogui (after preparing the patch) via ssh
but the system claims the sound device is busy.
Didn't find out why so far, a simple test-patch runs fine though.
No idea what's going on.
> For those of you who are getting skips in the sound, I'm curious if Pd
> is printing the usual messages like:
> priority 96 scheduling enabled.
> priority 98 scheduling enabled.
> on standard error when it starts up --
no, no such messages at start up.
> if not, it would be worth trying
> to figure out how to get Pd to be able to get real-time priority which
> might fix some of the problems.
BTW, is it possible to quit Pd via the patch?
Just in case Pd has such high priority that the system becomes inaccessible.
> On Mon, Aug 13, 2012 at 08:35:25AM -0700, Scott R. Looney wrote:
>> hey folks - just commenting on USB class compliant devices - the Tascam
>> US-800 interface (about $100US) is another class compliant device. it's
>> been shown to work reliably with 8 track recording on iPad. just wanted
>> folks to know there was a cheaper interface option out there, though i'd
>> certainly love to own a Fireface USB interface myself. The US-800 has 6
>> Neutrik inputs with phantom, 2 SPDIF (Stereo In and Out) and 4 unbalanced
>> outs. it's very light, though, and it may be possible (with modification)
>> to stick the R-Pi inside its case.
>> hope this might help somebody...
>> On Mon, Aug 13, 2012 at 6:54 AM, Tedb0t <lists at liminastudio.com> wrote:
>>> Huh, really? How did you find this out?
>>> On Aug 13, 2012, at 8:43 AM, Pierre Massat wrote:
>>>> Hi all,
>>>> I don't know whether this was mentioned here, but the audio output
>>> throught the built in jack is bad because it uses PWM followed by a filter,
>>> no real dedicated dac. You can tweek the settings of Pd for years but
>>> you'll never get an good quality sound out of it.
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