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[io] [osx] switch to floating point AudioBufferList

--- a/src/io/utils_apple_audio.c

+++ b/src/io/utils_apple_audio.c

@@ -12,11 +12,12 @@

 CFURLRef getURLFromPath(const char * path);

 char_t *getPrintableOSStatusError(char_t *str, OSStatus error);

-int createAubioBufferList(AudioBufferList * bufferList, int channels, int max_source_samples) {

+int createAudioBufferList(AudioBufferList * bufferList, int channels,

+    int max_source_samples) {

   bufferList->mNumberBuffers = 1;

   bufferList->mBuffers[0].mNumberChannels = channels;

-  bufferList->mBuffers[0].mData = AUBIO_ARRAY(short, max_source_samples);

-  bufferList->mBuffers[0].mDataByteSize = max_source_samples * sizeof(short);

+  bufferList->mBuffers[0].mData = AUBIO_ARRAY(smpl_t, max_source_samples);

+  bufferList->mBuffers[0].mDataByteSize = max_source_samples * sizeof(smpl_t);

   return 0;

 }