[PD-dev] Debugging PdLib on iPod Touch

Hans-Christoph Steiner hans at at.or.at
Sun Nov 28 02:19:27 CET 2010

OpenFrameworks has open source code that works  for audio on all iPod  
Touchs, including the 1G.  Other options would be to checkout Bryan  
Sommerset's original pdlib for iPhoneOS.


On Nov 26, 2010, at 4:43 PM, Peter Brinkmann wrote:

> Hi Chris,
> Regarding the sample rate problem on older iPods, I would try to  
> find an audio project that works properly on an iPod Touch 2G and  
> see how its setup code differs from that in PdAudio.  Other than  
> that, I'm afraid I don't have much of an idea because I don't know  
> much about iPhone development and I don't have any ARMv6 devices to  
> experiment with.  A number of people seem to be interested in this  
> problem, and so I started a new topic at pd-everywhere in order to  
> create a place where people can meet up and exchange notes: http://noisepages.com/groups/pd-everywhere/forum/topic/libpd-and-armv6/
> Best,
>      Peter
> On Fri, Nov 26, 2010 at 2:16 PM, Chris Niven <cjniven at gmail.com>  
> wrote:
> Hey Peter, list —
> I've been testing out PdLib's objc glue with the xcode project  
> included in your git repo, and was able to get it to run  
> successfully on an iPhone 3G, which is cool but — I noticed in the  
> readme that audio doesn't work on iPod Touch 2G, as well as a few  
> other devices.
> Is there any reason for this? I've been trying to debug it (my main  
> testing device is an iPod Touch 2G) and it seems that in PdAudio's  
> initializeAudioSession, the sampling rate does not get set properly  
> with the call to
> AudioSessionSetProperty 
> (kAudioSessionProperty_PreferredHardwareSampleRate  
> sizeof(sampleRate), &sampleRate);
> I set the sampling rate to 22050Hz, which works fine for the iPhone  
> 3G — but the iPod Touch always reverts to the sampling rate of  
> 44.1Hz, and audio is never played.
> I'm going to keep looking at it, but any ideas as to why this is  
> happening in the first place would be appreciated — I'm curious as  
> to why I can run RJDJ on my iPod Touch fine, but PdLib does not work  
> even though it is based on the same code.
> Thanks,
> Chris Niven
> B.Mus., Music Technology
> 514.591.9487
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