REPLAYGAIN_TRACK   80 libavfilter/af_volume.c         { "track",  "track gain is preferred",         0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_TRACK  }, 0, 0, A, "replaygain" },
REPLAYGAIN_TRACK  355 libavfilter/af_volume.c             if (vol->replaygain == REPLAYGAIN_TRACK &&