aacpsy: correct calculation of minath in psy_3gpp_init
The minimum of the ath(x, ATH_ADD) function depends on ATH_ADD.
This patch uses the first order approximation to determine it.
For ATH_ADD = 4 this results in the value at 3407.06812 (-5.
24241638)
not the one at 3410 (-5.
24237967).
CC: libav-stabl@libav.org
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
(cherry picked from commit
110f7f35fb615b97d983b1c6c6a714fddd28bcbe)
Signed-off-by: Anton Khirnov <anton@khirnov.net>