LEVEL_ZERO         79 libavcodec/ac3dec.c     LEVEL_ZERO,
LEVEL_ZERO         60 libavcodec/ac3enc.c     LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO
LEVEL_ZERO         66 libavcodec/ac3enc.c     LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB, LEVEL_ZERO