LEVEL_MINUS_4POINT5DB   77 libavcodec/ac3dec.c     LEVEL_MINUS_4POINT5DB,
LEVEL_MINUS_4POINT5DB   55 libavcodec/ac3enc.c     LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB
LEVEL_MINUS_4POINT5DB   65 libavcodec/ac3enc.c     LEVEL_PLUS_3DB,  LEVEL_PLUS_1POINT5DB,  LEVEL_ONE,       LEVEL_MINUS_4POINT5DB,
LEVEL_MINUS_4POINT5DB   66 libavcodec/ac3enc.c     LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB, LEVEL_ZERO
LEVEL_MINUS_4POINT5DB   31 libavcodec/ac3enc_opts_template.c {"center_mixlev", "Center Mix Level", OFFSET(center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_4POINT5DB }, 0.0, 1.0, AC3ENC_PARAM},