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use bytes::{Bytes, BytesMut};
use rayon::prelude::*;
use std::marker::PhantomData;
use std::sync::atomic::{AtomicPtr, Ordering};
use super::{VideoFrame, ByteChannels};
#[derive(Clone, Debug)]
pub struct PlanarFrame<T> {
bytes: Bytes,
width: usize,
height: usize,
pixel: PhantomData<T>
}
impl<T: ByteChannels> VideoFrame for PlanarFrame<T> {
type Pixel = T;
fn width(&self) -> usize { self.width }
fn height(&self) -> usize { self.height }
unsafe fn pixel(&self, x: usize, y: usize) -> Self::Pixel {
let len = self.width * self.height;
let mut off = y * self.width + x;
let mut channels = T::Channels::default();
for channel in channels.as_mut() {
*channel = *self.bytes.get_unchecked(off);
off += len;
}
channels.into()
}
}
impl<T: ByteChannels> PlanarFrame<T> {
pub fn from_bytes(
width: usize,
height: usize,
bytes: Bytes
) -> Self {
assert_eq!(bytes.len(), width * height * T::width());
Self { bytes, width, height, pixel: PhantomData }
}
pub fn bytes(&self) -> Bytes {
self.bytes.clone()
}
pub fn new<U>(frame: U) -> Self
where U: VideoFrame<Pixel = T> + Sync {
let (width, height) = (frame.width(), frame.height());
let length = width * height;
let size = T::width() * length;
let mut bytes = BytesMut::with_capacity(size);
let ptr = AtomicPtr::new(bytes.as_mut_ptr());
unsafe { bytes.set_len(size); }
(0..length).into_par_iter().for_each(|i| unsafe {
let channels = T::Channels::from({
let (x, y) = (i % width, i / width);
frame.pixel(x, y).into()
});
let mut ptr = ptr.load(Ordering::Relaxed).offset(i as _);
for &channel in channels.as_ref() {
*ptr = channel;
ptr = ptr.offset(length as _);
}
});
Self::from_bytes(width, height, bytes.freeze())
}
}
#[test]
fn black() {
use super::{Function, Rgba, pixels};
let (w, h) = (1280, 720);
let frame = PlanarFrame::new(
Function::new(w, h, |_, _| Rgba(0, 0, 0, 0))
);
assert_eq!(frame.width(), w);
assert_eq!(frame.height(), h);
assert_eq!(frame.bytes, vec![0; w * h * 4]);
assert_eq!(pixels(&frame).count(), w * h);
assert!(pixels(&frame).all(|x| x == Rgba(0, 0, 0, 0)));
}