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src/io/audio_unit.c: fix deprecation warning (closes #16)

--- a/src/io/audio_unit.c

+++ b/src/io/audio_unit.c

@@ -233,14 +233,14 @@

   audioFormat.mSampleRate = (Float64)samplerate;

   audioFormat.mChannelsPerFrame = 2;

   audioFormat.mFormatID = kAudioFormatLinearPCM;

-  audioFormat.mFormatFlags = kAudioFormatFlagsCanonical;

+  audioFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagsNativeEndian | kAudioFormatFlagIsPacked;

   audioFormat.mFramesPerPacket = 1;

-  audioFormat.mBitsPerChannel = 8 * sizeof(AudioSampleType);

+  audioFormat.mBitsPerChannel = 8 * sizeof(SInt16);

 #if 1  // interleaving

-  audioFormat.mBytesPerFrame = 2 * sizeof(AudioSampleType);

-  audioFormat.mBytesPerPacket = 2 * sizeof(AudioSampleType);

+  audioFormat.mBytesPerFrame = 2 * sizeof(SInt16);

+  audioFormat.mBytesPerPacket = 2 * sizeof(SInt16);

 #else

-  audioFormat.mBytesPerPacket = audioFormat.mBytesPerFrame = sizeof(AudioUnitSampleType);

+  audioFormat.mBytesPerPacket = audioFormat.mBytesPerFrame = sizeof(SInt32);

   audioFormat.mFormatFlags |= kAudioFormatFlagIsNonInterleaved;

 #endif