Constant libpulse_sys::proplist::PA_PROP_FILTER_APPLY

pub const PA_PROP_FILTER_APPLY: &str = "filter.apply";

For streams: the name of a filter that is desired, e.g. "echo-cancel" or "equalizer-sink". Differs from PA_PROP_FILTER_WANT in that it forces PulseAudio to apply the filter, regardless of whether PulseAudio thinks it makes sense to do so or not. If this is set, PA_PROP_FILTER_WANT is ignored. In other words, you almost certainly do not want to use this.