| 1 | use std::mem::swap; |
| 2 | pub use crate::frame::{FrameType, NAFrameRef}; |
| 3 | |
| 4 | pub trait FrameReorderer { |
| 5 | fn add_frame(&mut self, fref: NAFrameRef) -> bool; |
| 6 | fn get_frame(&mut self) -> Option<NAFrameRef>; |
| 7 | fn flush(&mut self); |
| 8 | fn get_last_frames(&mut self) -> Option<NAFrameRef>; |
| 9 | } |
| 10 | |
| 11 | pub struct NoReorderer { |
| 12 | fref: Option<NAFrameRef>, |
| 13 | } |
| 14 | |
| 15 | impl NoReorderer { |
| 16 | pub fn new() -> Self { |
| 17 | Self { fref: None } |
| 18 | } |
| 19 | } |
| 20 | |
| 21 | impl FrameReorderer for NoReorderer { |
| 22 | fn add_frame(&mut self, fref: NAFrameRef) -> bool { |
| 23 | if self.fref.is_none() { |
| 24 | self.fref = Some(fref); |
| 25 | true |
| 26 | } else { |
| 27 | false |
| 28 | } |
| 29 | } |
| 30 | fn get_frame(&mut self) -> Option<NAFrameRef> { |
| 31 | let mut ret = None; |
| 32 | swap(&mut ret, &mut self.fref); |
| 33 | ret |
| 34 | } |
| 35 | fn flush(&mut self) { self.fref = None; } |
| 36 | fn get_last_frames(&mut self) -> Option<NAFrameRef> { None } |
| 37 | } |
| 38 | |
| 39 | pub struct IPBReorderer { |
| 40 | frames: Vec<NAFrameRef>, |
| 41 | max_depth: usize, |
| 42 | last_ft: FrameType, |
| 43 | } |
| 44 | |
| 45 | impl IPBReorderer { |
| 46 | pub fn new(max_depth: usize) -> Self { |
| 47 | Self { |
| 48 | frames: Vec::with_capacity(max_depth), |
| 49 | max_depth, |
| 50 | last_ft: FrameType::Other, |
| 51 | } |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | impl FrameReorderer for IPBReorderer { |
| 56 | fn add_frame(&mut self, fref: NAFrameRef) -> bool { |
| 57 | if self.frames.len() < self.max_depth { |
| 58 | let cur_ft = fref.get_frame_type(); |
| 59 | if cur_ft != FrameType::B { |
| 60 | self.frames.push(fref); |
| 61 | self.last_ft = cur_ft; |
| 62 | } else { |
| 63 | let pframe = self.frames.pop(); |
| 64 | if pframe.is_some() { |
| 65 | self.frames.push(fref); |
| 66 | self.frames.push(pframe.unwrap()); |
| 67 | } else { |
| 68 | self.last_ft = cur_ft; |
| 69 | } |
| 70 | } |
| 71 | true |
| 72 | } else { |
| 73 | false |
| 74 | } |
| 75 | } |
| 76 | fn get_frame(&mut self) -> Option<NAFrameRef> { |
| 77 | if !self.frames.is_empty() { |
| 78 | Some(self.frames.remove(0)) |
| 79 | } else { |
| 80 | None |
| 81 | } |
| 82 | } |
| 83 | fn flush(&mut self) { |
| 84 | self.frames.clear(); |
| 85 | self.last_ft = FrameType::Other; |
| 86 | } |
| 87 | fn get_last_frames(&mut self) -> Option<NAFrameRef> { |
| 88 | self.get_frame() |
| 89 | } |
| 90 | } |
| 91 | |