[PD] pd on armv7 (beagleboard): crackles / pcm not available?

[Hans-Christoph Steiner]

On Jul 11, 2010, at 12:31 PM, Damian Stewart wrote:

>
> On 09 Jul 2010, at 21:12, pd-list-request at iem.at wrote:
>> Date: Fri, 9 Jul 2010 19:05:53 +0200
>> From: Dan Wilcox <danomatika at gmail.com>
>> 2 things:
>>
>> - the "snd_pcm_open (output): Device or resource busy" issue is, as  
>> Iohannes said, due to the -nogui bug. Put a delay on your "dsp 1"  
>> message. I use 100 ms.
>
> yeah, fixed that, thanks!
>
>>
>> - the crackles are probably coming from dropouts due to pd not  
>> running in realtime. Try this and use alsa: http://puredata.info/docs/tutorials/HowToRunPDWithRealtimePriorityInUbuntu 
>>  . I have not problem on a slow machine using alsa and -rt without  
>> Jack.
>
> ok, did all that - now i think it worked because with the -rt flag  
> the gui was extremely slow, but the messages to the console were  
> 'proirity scheduling 6' and 'priority scheduling 8', not the 98 i  
> was expecting.
>
> in any case, sound output (full of clicks) is exactly the same  
> running -rt as running without.
>
> the only way i was able to get something that even vaguely resembled  
> what i was expecting was by using the -blocksize argument to set a  
> blocksize of around 16384 or more frames... but even then it was  
> still full of clicks, it just didn't sound so stupid.


Can you get any audio app working properly on the beagleboard?  I  
vaguely remember something about bugs in the ALSA driver for that  
hardware.

.hc

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