scuffle-mp4 0.1.5

A pure Rust MP4 parser and writer.
Documentation 
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use std::io;

use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
use bytes::Bytes;

use crate::boxes::header::BoxHeader;
use crate::boxes::traits::BoxType;

#[derive(Debug, Clone, PartialEq)]
/// Clean Aperture Box
/// ISO/IEC 14496-12:2022(E) - 12.1.4.2
pub struct Clap {
    pub header: BoxHeader,
    pub clean_aperture_width_n: u32,
    pub clean_aperture_width_d: u32,
    pub clean_aperture_height_n: u32,
    pub clean_aperture_height_d: u32,
    pub horiz_off_n: u32,
    pub horiz_off_d: u32,
    pub vert_off_n: u32,
    pub vert_off_d: u32,
}

impl BoxType for Clap {
    const NAME: [u8; 4] = *b"clap";

    fn demux(header: BoxHeader, data: Bytes) -> io::Result<Self> {
        let mut reader = io::Cursor::new(data);

        let clean_aperture_width_n = reader.read_u32::<BigEndian>()?;
        let clean_aperture_width_d = reader.read_u32::<BigEndian>()?;
        let clean_aperture_height_n = reader.read_u32::<BigEndian>()?;
        let clean_aperture_height_d = reader.read_u32::<BigEndian>()?;
        let horiz_off_n = reader.read_u32::<BigEndian>()?;
        let horiz_off_d = reader.read_u32::<BigEndian>()?;
        let vert_off_n = reader.read_u32::<BigEndian>()?;
        let vert_off_d = reader.read_u32::<BigEndian>()?;

        Ok(Self {
            header,

            clean_aperture_width_n,
            clean_aperture_width_d,
            clean_aperture_height_n,
            clean_aperture_height_d,
            horiz_off_n,
            horiz_off_d,
            vert_off_n,
            vert_off_d,
        })
    }

    fn primitive_size(&self) -> u64 {
        4 // clean_aperture_width_n
        + 4 // clean_aperture_width_d
        + 4 // clean_aperture_height_n
        + 4 // clean_aperture_height_d
        + 4 // horiz_off_n
        + 4 // horiz_off_d
        + 4 // vert_off_n
        + 4 // vert_off_d
    }

    fn primitive_mux<T: io::Write>(&self, writer: &mut T) -> io::Result<()> {
        writer.write_u32::<BigEndian>(self.clean_aperture_width_n)?;
        writer.write_u32::<BigEndian>(self.clean_aperture_width_d)?;
        writer.write_u32::<BigEndian>(self.clean_aperture_height_n)?;
        writer.write_u32::<BigEndian>(self.clean_aperture_height_d)?;
        writer.write_u32::<BigEndian>(self.horiz_off_n)?;
        writer.write_u32::<BigEndian>(self.horiz_off_d)?;
        writer.write_u32::<BigEndian>(self.vert_off_n)?;
        writer.write_u32::<BigEndian>(self.vert_off_d)?;

        Ok(())
    }
}