Encoding: allow user-defined encoded sample rate #700
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This PR allows the user to specify a desired sample rate for the encoded output.
Unlike other conversions (format, num_channels), this one is far from trivial. It involves, in some specific scenarios, the use of an intermediate FIFO to store samples before they get encoded. I tried to document all of this in the
Note: [Encoding loop, sample rate conversion and FIFO], so I recommend starting the review from there.