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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)
}
}
}