[PD-dev] Pd on ARM/Gumstix Overo - audio problems

[Duncan Speakman]

Thanks!

we eventually got it working with a griffin iMic usb device, thanks for the tip.
Having some performance issues with Pd so going to try PDa now.

d


On 5 March 2012 02:09, Miller Puckette <msp at ucsd.edu> wrote:
> Could be a portability problem in Pd's audio I/O code or (more likely
> I think) some kind of limitation in the audio driver itself.  Perhaps audio
> input only works in one channel and Pd is tring to use it in stereo?  It
> migth help to use an external USB audio device if that's practical.
>
> cheers
> Miller
> On Mon, Mar 05, 2012 at 12:19:04AM +0100, Duncan Speakman wrote:
>> Hi all,
>>
>> We're running Pd 0.43 on a Gumstix Overo Airstorm with Cortex A8
>> architecture, using Linaro 12.02 distribution (which is based on
>> Ubuntu 11.10 )
>> Pd seems to be working but audio input and output is displaying
>> strange behaviours and processing artifacts.
>> Simple osc~ objects play their tones at half pitch, and when we run
>> audio into it in realtime ( connecting adc~ direct to dac~ ) we
>> experience both lower pitch and time granulation. CPU usage reads less
>> than 2%.
>>
>> Samplerate is 44100 and blocksize is currently at 1024 (anything lower
>> than this creates crackling, and causes CPU usage to jump to 80%)
>>
>> Does anyone here know if this CPU is just unable to process floating
>> point data at the speed required by Pd, or whether there are some
>> processing settings/ priority settings or a different kind of kernel
>> that would allow Pd to run correctly on this platform.
>> We're surprised it's not working as we know PDlib runs fine on the
>> iPhone for instance.  We've already successfully run PDa on a Gumstix
>> Verdex but really want to move to full Pd to get around the
>> limitations of PDa.
>>
>> any thoughts or suggestion welcome,
>> we're getting desperate!
>>
>> duncan
>>
>> --
>> follow me : @ofcircumstance
>>
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