it looks like you are crashing because you aren't catching the  
exception...

Just put a try-catch block around this (the problematic file doesn't  
have a channel layout I guess)

Bill

On 16/01/2006, at 5:02 PM, Michael Hanna wrote:

> I have a simple app that is based on the PlayFile example. It crashes
> on a particular multichannel wav file. The file WILL play in AU Lab
> and QuickTime Player 7.
>
> strangely, a different multichannel wav file plays properly.
>
> crashing file:
> http://siddha.ca/mymusic/samples/multichannel/qwave.wav
>
> non-crashing file:
> http://siddha.ca/mymusic/samples/multichannel/drmapan.wav
>
> code section:
>
> // if we have a surround file, then we should try to tell the output
> AU what the order of the channels will be
> if (fFileFormat.NumberChannels() > 2) {
> UInt32 layoutSize = 0;
> OSStatus err;
>
> NSLog(@"before AudioFileGetPropertyInfo");
>
> XThrowIfError (err = AudioFileGetPropertyInfo (fAudioFile,
> kAudioFilePropertyChannelLayout, &layoutSize, NULL),
>    "kAudioFilePropertyChannelLayout");
>
> NSLog(@"after AudioFileGetPropertyInfo");
> if (!err && layoutSize) {
> char* layout = new char[layoutSize];
>
> err = AudioFileGetProperty(fAudioFile,
> kAudioFilePropertyChannelLayout, &layoutSize, layout);
> XThrowIfError (err, "Get Layout From AudioFile");
>
> // ok, now get the output AU and set its layout
> XThrowIfError (AUGraphGetNodeInfo(fGraph, outputNode, NULL, NULL,
> NULL, &fileAU), "AUGraphGetNodeInfo");
>
> err = AudioUnitSetProperty (fileAU,  
> kAudioUnitProperty_AudioChannelLayout,
> kAudioUnitScope_Input, 0, layout, layoutSize);
> XThrowIfError (err, "kAudioUnitProperty_AudioChannelLayout");
>
> delete [] layout;
> }
> }
>
> "after AudioFileGetPropertyInfo" never gets printed, so I assume that
> the crash occurs at AudioFileGetPropertyInfo().
>
> any suggestions on what the issue may be? How do I catch this sort of
> exception, or better yet, how do I diagnose the problem? I tried
> NSLogging the contents of the various parameters of the
> AudioFileGetPropertyInfo() call, but I could not inspect them at
> compile-time(some sort of 'anonymous struct' error).
>
> entire method source:
>
> http://rafb.net/paste/results/uE1OmC96.html
>
> o/p of the error:
>
> [Session started at 2006-01-16 16:32:14 -0800.]
> playing file: /Users/mhanna/mydev/audio/samples/multichannel/qwave.wav
> format: AudioStreamBasicDescription:  4 ch,  22050 Hz, 'lpcm'
> (0x0000000C) 16-bit little-endian signed integer
> 2006-01-16 16:32:29.150 SimplePlayFile[1962] before  
> AudioFileGetPropertyInfo
> terminate called after throwing an instance of 'CAXException'
>
>
> regards,
> Michael
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