Equalizer 构造函数

Create a new default equalizer, with all frequency values zeroed. The new equalizer can subsequently be applied to a media player by invoking libvlc_media_player_set_equalizer(). version LibVLC 2.2.0 or later

Create a new equalizer, with initial frequency values copied from an existing preset. The new equalizer can subsequently be applied to a media player by invoking libvlc_media_player_set_equalizer(). version LibVLC 2.2.0 or later