[PD] Multiple audio devices limited to four devices?

[Martin Schied]

Thanks!

it's working fine now...

I'll try to use a common clock later, but for now it's sufficient like 
this. I's playing music for over an hour without recognizable dropouts...

Ideas how to test for asynchronity (audioble effects?) and how strong 
they become? I used 0.1 ms bursts of 10kHz sines and also short swept 
sines. At least there were recognizable effects like distorted 
localization of sounds.

To have a block wise sync I planned to use a microphone and measure 
roundtrip latency before starting my patches.

cheers
Martin



Miller Puckette wrote:
> hmm... "grep 4 *.c" didn't seem to help when I tried it.  Anyhow, I
> found two places that would have to change: in s_stuff.h:
>
> #define MAXAUDIOINDEV 4
> #define MAXAUDIOOUTDEV 4
>
> and in s_audio_oss.c:
>
> #define OSS_MAXDEV 4            /* maximum number of input or output devices */
>
> On a somewhat related note, you'l eventually get sync errors between the
> devices unless you can find a way to hard-sync them.  If I were trying it,
> I'd just phase-lock the crystals by connecting the five (or N) together
> in parallel.  Worst that could happen is I'd have to buy 5 more interfaces :)
>
> M
>
> On Fri, Jul 17, 2009 at 04:28:38PM +0200, Martin Schied wrote:
>   
>> Hi!
>>
>> I'm trying to use five (or more) ultra-cheap stereo-USB-speakers 
>> together. Four of them are working when starting pd with
>>
>> /usr/bin/pd -rt -oss -audiooutdev "2,3,4,5,6" -outchannels "2,2,2,2,2" 
>> multiaudiotest.pd  
>>
>> when looking into media, audio-settings dialog, only the first four of 
>> them are visible and also only these four are usable for output.
>>
>> this is with Pd version 0.41-4extended, ubuntu-intrepid and also pd 
>> 0.42.5. I assume this is a hard coded limit which can be changed - but I 
>> don't know where...
>>
>> cheers,
>> Martin
>>
>>
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