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use std::mem::swap;
pub use crate::frame::{FrameType, NAFrameRef};
pub trait FrameReorderer {
fn add_frame(&mut self, fref: NAFrameRef) -> bool;
fn get_frame(&mut self) -> Option<NAFrameRef>;
fn flush(&mut self);
fn get_last_frames(&mut self) -> Option<NAFrameRef>;
}
pub struct NoReorderer {
fref: Option<NAFrameRef>,
}
impl NoReorderer {
pub fn new() -> Self {
Self { fref: None }
}
}
impl FrameReorderer for NoReorderer {
fn add_frame(&mut self, fref: NAFrameRef) -> bool {
if self.fref.is_none() {
self.fref = Some(fref);
true
} else {
false
}
}
fn get_frame(&mut self) -> Option<NAFrameRef> {
let mut ret = None;
swap(&mut ret, &mut self.fref);
ret
}
fn flush(&mut self) { self.fref = None; }
fn get_last_frames(&mut self) -> Option<NAFrameRef> { None }
}
pub struct IPBReorderer {
frames: Vec<NAFrameRef>,
max_depth: usize,
last_ft: FrameType,
}
impl IPBReorderer {
pub fn new(max_depth: usize) -> Self {
Self {
frames: Vec::with_capacity(max_depth),
max_depth,
last_ft: FrameType::Other,
}
}
}
impl FrameReorderer for IPBReorderer {
fn add_frame(&mut self, fref: NAFrameRef) -> bool {
if self.frames.len() < self.max_depth {
let cur_ft = fref.get_frame_type();
if cur_ft != FrameType::B {
self.frames.push(fref);
self.last_ft = cur_ft;
} else {
let pframe = self.frames.pop();
if pframe.is_some() {
self.frames.push(fref);
self.frames.push(pframe.unwrap());
} else {
self.last_ft = cur_ft;
}
}
true
} else {
false
}
}
fn get_frame(&mut self) -> Option<NAFrameRef> {
if !self.frames.is_empty() {
Some(self.frames.remove(0))
} else {
None
}
}
fn flush(&mut self) {
self.frames.clear();
self.last_ft = FrameType::Other;
}
fn get_last_frames(&mut self) -> Option<NAFrameRef> {
self.get_frame()
}
}
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