Constant libpulse_sys::proplist::PA_PROP_FILTER_WANT

pub const PA_PROP_FILTER_WANT: &str = "filter.want";

For streams: the name of a filter that is desired, e.g. “echo-cancel” or “equalizer-sink”. PulseAudio may choose to not apply the filter if it does not make sense (for example, applying echo-cancellation on a Bluetooth headset probably does not make sense.