pub unsafe trait BaseSinkBase: IsA<Element> + IsA<BaseSink> + ObjectType {
    fn parent_query(&self, query: &mut QueryRef) -> bool { ... }
    fn parent_event(&self, event: Event) -> bool { ... }
    fn parent_get_caps(&self, filter: Option<&CapsRef>) -> Option<Caps> { ... }
    fn parent_set_caps(&self, caps: &CapsRef) -> bool { ... }
    fn parent_fixate(&self, caps: Caps) -> Caps { ... }
}

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