Apple

// Get file length

UInt64 nPackets;

UInt32 nPacketsSize = sizeof(nPackets);

checkError(AudioFileGetProperty(audioFile,

kAudioFilePropertyAudioDataByteCount,

&nPacketsSize,

&nPackets),

"ExtAudioFileGetProperty failed: obtaining length of playback file", false);

// Setup the region

ScheduledAudioFileRegion rgn;

memset(&rgn.mTimeStamp, 0, sizeof(rgn.mTimeStamp));

rgn.mTimeStamp.mFlags = kAudioTimeStampSampleTimeValid;

rgn.mTimeStamp.mSampleTime = 0;

rgn.mCompletionProc = NULL;

rgn.mCompletionProcUserData = NULL;

rgn.mAudioFile = audioFile;

rgn.mLoopCount = 1;

rgn.mStartFrame = 0;

rgn.mFramesToPlay = nPackets * fileDesc.mFramesPerPacket;

But it crashes during playback. I think this is because nPackets is always zero (checked right after the AudioFileGetProperty call.) Is there a better way to obtain the number of frames to play? Also, why is nPackets zero here? What should I be looking to check?