a52_imp: Improve a52 muxing performance by reducing buffer reallocation.
a52_imp: Improve a52 muxing performance by reducing buffer reallocation.

silverfilain/L-SMASH,l-smash/l-smash,silverfilain/L-SMASH,l-smash/l-smash,silverfilain/L-SMASH,l-smash/l-smash