Commits on Feb 21, 2021

1. Allow circular buffer to report disjoint buffer …

   This allows to avoid memmove after each consume_cbuff_data.
   Some extra care was necessary to round queue transactions to a multiple
   of the sample size.
   
   I also did some refactoring on the cbuff to allow it to grow and on the
   resamplers to allw them to report not only how many bytes were consumed,
   but also how many bytes were produced, so we can move cbuff pointers
   accordingly.
   
   tail/head methods reports the available sizes in 2 parameters :
   "available" for the first chunk size, and "extra" for the optional
   second chunk (which starts at the buffer beginning).
   It's up to the caller to split it's contiguous accesses around these two
   chunks.
   
   Another method that I initially wanted to try was the virtual memory
   trick to mirror the beggining of the buffer at the end of itself. But
   this trick requires some code specific platform and can be tricky when
   we need to grow the buffer. So I went this explicit 2 chunk approach
   which is simpler and doesn't require platform specific code.

   

   bsmiles32 committed Feb 21, 2021
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