Silences -fsanitize=unsigned-integer-overflow even though the code was
valid (not undefined) C.

Silences -fsanitize=unsigned-integer-overflow even though the code was
valid (not undefined) C.

Change-Id: Ib016fc8f0066980e3e5122b3f286680adc228ff9
Signed-off-by: Jean-Marc Valin <jeanmarcv@google.com>

The exp2 function was approximated using lolremez, achieving an
accuracy of less than 2*10^-7 within the range of 0 to 1.

Signed-off-by: Jean-Marc Valin <jeanmarcv@google.com>

Change-Id: Ibd0d16918272cb568923d384475e139dc312c61b
Signed-off-by: Jean-Marc Valin <jeanmarcv@google.com>

The log2 function was approximated using lolremez, achieving an
accuracy of less than 1.4*10^-8 within the range of 1 to 2.

Signed-off-by: Jean-Marc Valin <jeanmarcv@google.com>

Convert to 16 bits only at the very end

Compensates for the spectral leakage and the fact that we don't have
an explicit masking curve.

Detecting tones can help us prevent the encoder from getting confused
by them.