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Re: problems compiling SDK PublicUtility classes

Yes - we hope to have a fixed SDK out in the next couple of weeks - apologies for the problems.

On 02/02/2005, at 10:02 PM, Miles Egan wrote:

As others have reported the CAAudioFile classes distributed in the SDK do not currently compile on Panther with XCode 1.5. Is any fix for this forthcoming? I'd prefer not to use them but since the AudioConverter API documentation is currently pretty sparse it seems easier than trying to write to the bare api. In the future I'd really appreciate some sample code that doesn't rely on external classes since walking around the inheritance heirarchy of CAAudioFile to discover things like proper buffer memory management and ownership can be frustrating to someone like myself trying to understand a new and complex API.
Perhaps I should ask this before I try to go much further in my current direction: the AudioConverter in Panther can decode mp3 and aac files to raw PCM, right? I'm working on a simple little music player and I'd like to fall back on CoreAudio for this but it's not entirely clear from docs and searches on the list if I should expect this to work currently.

aac = yes as in an ADTS file (this is an MPEG-2 defined bitstream).

But its not the converter's job to know about files. It knows about data formats. The AudioFile API knows about files.

So, AudioConverter:
Can decode MP3
Can encode and decode AAC
With Panther

AudioFile
Can read and write MP1 bit streams (this includes the commonly referred to mp3 files)
Can read and write ADTS files

Can NOT read or write m4a, movies, mp4 files

However, QT api's can do this and there's an example in the SDK of using the QT APIs to read aac data from an m4a file

There's a session we did at WWDC (both 2004 and 2003) that went into some detail about how the CoreAudio APIs handle these issues - I think there are still DVDs available for these sessions on the developer web site (developer.apple.com)

HTH

Bill

thanks,
miles
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References: 
 >problems compiling SDK PublicUtility classes (From: Miles Egan <email@hidden>)



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