Here are the data structures with brief descriptions:

CSoundIo	The size of this struct is not part of the API or ABI
CSoundIoChannelArea	The size of this struct is OK to use
CSoundIoChannelLayout	The size of this struct is OK to use
CSoundIoDevice	The size of this struct is not part of the API or ABI
CSoundIoInStream	The size of this struct is not part of the API or ABI
CSoundIoOutStream	The size of this struct is not part of the API or ABI
CSoundIoSampleRateRange	The size of this struct is OK to use