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use std::ffi::CStr; use std::marker::PhantomData; use std::str::from_utf8_unchecked; use super::{Flags, Pad}; use ffi::*; pub struct Filter { ptr: *mut AVFilter, } impl Filter { pub unsafe fn wrap(ptr: *mut AVFilter) -> Self { Filter { ptr } } pub unsafe fn as_ptr(&self) -> *const AVFilter { self.ptr as *const _ } pub unsafe fn as_mut_ptr(&mut self) -> *mut AVFilter { self.ptr } } impl Filter { pub fn name(&self) -> &str { unsafe { from_utf8_unchecked(CStr::from_ptr((*self.as_ptr()).name).to_bytes()) } } pub fn description(&self) -> Option<&str> { unsafe { let ptr = (*self.as_ptr()).description; if ptr.is_null() { None } else { Some(from_utf8_unchecked(CStr::from_ptr(ptr).to_bytes())) } } } pub fn inputs(&self) -> Option<PadIter> { unsafe { let ptr = (*self.as_ptr()).inputs; if ptr.is_null() { None } else { Some(PadIter::new((*self.as_ptr()).inputs)) } } } pub fn outputs(&self) -> Option<PadIter> { unsafe { let ptr = (*self.as_ptr()).outputs; if ptr.is_null() { None } else { Some(PadIter::new((*self.as_ptr()).outputs)) } } } pub fn flags(&self) -> Flags { unsafe { Flags::from_bits_truncate((*self.as_ptr()).flags) } } } pub struct PadIter<'a> { ptr: *const AVFilterPad, cur: isize, _marker: PhantomData<&'a ()>, } impl<'a> PadIter<'a> { pub fn new(ptr: *const AVFilterPad) -> Self { PadIter { ptr, cur: 0, _marker: PhantomData, } } } impl<'a> Iterator for PadIter<'a> { type Item = Pad<'a>; fn next(&mut self) -> Option<Self::Item> { unsafe { if self.cur >= avfilter_pad_count(self.ptr) as isize { return None; } let pad = Pad::wrap(self.ptr, self.cur); self.cur += 1; Some(pad) } } }