I've spent a couple of days pining this down.
snd_pcm_hw_params_alloca() is part of the user API -right? But accomplished as a #define in pcm.h.
However if it is called inside a function, and the pointer stored for future use, after leaving the function the allocation seems to have gone, and attempting thereafter to use the pointer to access the hwparams space in another API function results in seg-fault.
This seems rather counter-intuitive (ie unexpected) to someone who has no knowledge of the inner workings, but simply uses the API; the allocation disappears without having been specifically free'd or released in any way. I know that calling it globally gets round the problem, but certainly I could do without all the debug needed to discover that.
Comments?
Alan