The log() function returns -Inf for level measure for stream of
digital zeros. It is correct but requires extra handling in the
upper level functions to avoid unnecessary tests fails. Adding of
offset 1e-20 results to -196.99 dBFS be the smallest possible
reported value. The function remains sufficient for all audio
measurements with 16 - 32 bit formats.
The license text is also updated to current version.
Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
Seppo Ingalsuo