SPAudioEngine AmbientSound issue?

presco

Hello. I came across an issue that puzzles me a bit.

I seem to remember that starting the SPAudioEngine with category AmbientSound used to work, but now it doesn't, meaning that iPod music is stopped when my app starts.

So I looked into SPAudioEngine.m and found these lines:

UInt32 sessionCategory = category;
AudioSessionSetProperty(kAudioSessionProperty_AudioCategory,
     sizeof(sessionCategory), &sessionCategory);

Because I couldn't figure out why a cryptic uint32 is fed in there, I changed it to:

UInt32 sessionCategory = category;
AudioSessionSetProperty(kAudioSessionProperty_AudioCategory,
     sizeof(sessionCategory), &category); //<- the string value instead

Now the original enum string 'ambi' gets fed in and it now works! iPod music keeps playing and my sound also plays. 😳 Is this a bug in Sparrow? Did something change in Apple's implementation? What did I do?

niksan

What is the type of category? In theory they should work the same unless there's some implicit type coversion shinanigans / endian issue.

Or what does &category and &sessionCategory look like in memory?

Dro

There's a recommendation to use Sparrow sound categories (SPAudioSessionCategory_AmbientSound). Not Apple ones (currently AVAudioSessionCategoryAmbient).