LEVEL_MINUS_6DB    80 libavcodec/ac3dec.c     LEVEL_MINUS_6DB,
LEVEL_MINUS_6DB    56 libavcodec/ac3enc.c     LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB
LEVEL_MINUS_6DB    61 libavcodec/ac3enc.c     LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO
LEVEL_MINUS_6DB    67 libavcodec/ac3enc.c     LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB, LEVEL_ZERO
LEVEL_MINUS_6DB    32 libavcodec/ac3enc_opts_template.c {"surround_mixlev", "Surround Mix Level", OFFSET(surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_6DB }, 0.0, 1.0, AC3ENC_PARAM},