I have one question. Is there a way to tell when audio playback as stopped as a result of the playback having reached the end of the file? It would seem that the first if statement in AudioOutputCallback does this, and/or checking for the lack of numPackets at the end of AudioOutputCallback.

What I was trying to do, however, was update the label with some “idle” text, and doing that in AudioOutputCallback is A) not feasible since it’s a C function and setting the label text involves objective-c, and B) just not the right place to do it, conceptually; that function is all about queueing audio packets for playback, and shouldn’t really be used for UI changes.

I’m probably just missing something, as my C/Obj-C skills haven’t fully matured yet. Is there even a way to call Obj-C from a C function? My initial attempts at that seemed to fail.

Thanks.

you need to start with a completely blank slate. So create a window-based application, then
1. remove both .xib files
2. empty out ‘ main nib file base name’ ( or even kill the entire line )
3. replace the main and application delegate header & body files with the three files listed on this posting
4. read through the comments. You need to do the three fixes
(1) change the code for the button generation
(2) set the read write permission on the file ( that’s the undeclared variable )
(3) typecast a couple of variables to (int) get rid of the remaining couple of warnings

and you should be good to go

this is a fabulous tutorial! Thank you so much for doing this! I wish Apple documentation was lucid like this…

PS there is a fairly active community on irc.freenode.net#coreaudio

I wanted to use your code for an iPhone application I’m writing. Are you distributing this code under a particular license?

kAudioFileReadPermission: File is read-only.
kAudioFileWritePermission: File is write-only.
kAudioFileReadWritePermission: File has read-write permission.

Available in iPhone OS 2.0 and later.
Declared in AudioFile.h.

I directly jump to the last page to get the source codes and tried to implement in my program and faced 13 errors related to AudioToolBox Framework errors because I didn’t add them to my Framework… for those who’s facing trouble… make sure you have the “AudioToolbox” framework added to your project framework!…

Your link isn’t working. I can’t even get a simle audio file to be played. The AudioQueueStart is giving problems.

Marc