scuffle-mp4 0.1.5

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

use bytes::{Buf, Bytes};

use super::dinf::Dinf;
use super::hmhd::Hmhd;
use super::nmhd::Nmhd;
use super::smhd::Smhd;
use super::stbl::Stbl;
use super::vmhd::Vmhd;
use crate::boxes::DynBox;
use crate::boxes::header::BoxHeader;
use crate::boxes::traits::BoxType;

#[derive(Debug, Clone, PartialEq)]
/// Media Information Box
/// ISO/IEC 14496-12:2022(E) - 8.4.4
pub struct Minf {
    pub header: BoxHeader,
    pub vmhd: Option<Vmhd>,
    pub smhd: Option<Smhd>,
    pub hmhd: Option<Hmhd>,
    pub nmhd: Option<Nmhd>,
    pub dinf: Dinf,
    pub stbl: Stbl,
    pub unknown: Vec<DynBox>,
}

impl Minf {
    pub fn new(stbl: Stbl, vmhd: Option<Vmhd>, smhd: Option<Smhd>) -> Self {
        Self {
            header: BoxHeader::new(Self::NAME),
            vmhd,
            smhd,
            hmhd: None,
            nmhd: None,
            dinf: Dinf::new(),
            stbl,
            unknown: Vec::new(),
        }
    }
}

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

    fn demux(header: BoxHeader, data: Bytes) -> io::Result<Self> {
        let mut reader = io::Cursor::new(data);
        let mut vmhd = None;
        let mut smhd = None;
        let mut hmhd = None;
        let mut nmhd = None;
        let mut dinf = None;
        let mut stbl = None;
        let mut unknown = Vec::new();

        while reader.has_remaining() {
            let dyn_box = DynBox::demux(&mut reader)?;

            match dyn_box {
                DynBox::Vmhd(b) => {
                    vmhd = Some(*b);
                }
                DynBox::Smhd(b) => {
                    smhd = Some(*b);
                }
                DynBox::Hmhd(b) => {
                    hmhd = Some(*b);
                }
                DynBox::Nmhd(b) => {
                    nmhd = Some(*b);
                }
                DynBox::Dinf(b) => {
                    dinf = Some(*b);
                }
                DynBox::Stbl(b) => {
                    stbl = Some(*b);
                }
                _ => {
                    unknown.push(dyn_box);
                }
            }
        }

        let dinf = dinf.ok_or_else(|| io::Error::new(io::ErrorKind::InvalidData, "minf: dinf box is required"))?;
        let stbl = stbl.ok_or_else(|| io::Error::new(io::ErrorKind::InvalidData, "minf: stbl box is required"))?;

        Ok(Self {
            header,
            vmhd,
            smhd,
            hmhd,
            nmhd,
            dinf,
            stbl,
            unknown,
        })
    }

    fn primitive_size(&self) -> u64 {
        self.vmhd.as_ref().map(|b| b.size()).unwrap_or(0) // vmhd 
        + self.smhd.as_ref().map(|b| b.size()).unwrap_or(0) // smhd
        + self.hmhd.as_ref().map(|b| b.size()).unwrap_or(0) // hmhd
        + self.nmhd.as_ref().map(|b| b.size()).unwrap_or(0) // nmhd
        + self.dinf.size() // dinf
        + self.stbl.size() // stbl
        + self.unknown.iter().map(|b| b.size()).sum::<u64>() // unknown boxes
    }

    fn primitive_mux<W: io::Write>(&self, writer: &mut W) -> io::Result<()> {
        if let Some(b) = &self.vmhd {
            b.mux(writer)?;
        }

        if let Some(b) = &self.smhd {
            b.mux(writer)?;
        }

        if let Some(b) = &self.hmhd {
            b.mux(writer)?;
        }

        if let Some(b) = &self.nmhd {
            b.mux(writer)?;
        }

        self.dinf.mux(writer)?;

        self.stbl.mux(writer)?;

        for b in &self.unknown {
            b.mux(writer)?;
        }

        Ok(())
    }
}