scuffle_mp4/boxes/types/
mvex.rs

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use std::io;

use bytes::{Buf, Bytes};

use super::mehd::Mehd;
use super::trex::Trex;
use crate::boxes::header::BoxHeader;
use crate::boxes::traits::BoxType;
use crate::boxes::DynBox;

#[derive(Debug, Clone, PartialEq)]
/// Movie Extends Box
/// ISO/IEC 14496-12:2022(E) - 8.8.1
pub struct Mvex {
    pub header: BoxHeader,
    pub trex: Vec<Trex>,
    pub mehd: Option<Mehd>,
    pub unknown: Vec<DynBox>,
}

impl Mvex {
    pub fn new(trex: Vec<Trex>, mehd: Option<Mehd>) -> Self {
        Self {
            header: BoxHeader::new(Self::NAME),
            trex,
            mehd,
            unknown: Vec::new(),
        }
    }
}

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

    fn demux(header: BoxHeader, data: Bytes) -> io::Result<Self> {
        let mut trex = Vec::new();
        let mut mehd = None;
        let mut unknown = Vec::new();

        let mut data = io::Cursor::new(data);
        while data.has_remaining() {
            let dyn_box = DynBox::demux(&mut data)?;

            match dyn_box {
                DynBox::Trex(b) => {
                    trex.push(*b);
                }
                DynBox::Mehd(b) => {
                    mehd = Some(*b);
                }
                _ => {
                    unknown.push(dyn_box);
                }
            }
        }

        Ok(Self {
            header,
            trex,
            mehd,
            unknown,
        })
    }

    fn primitive_size(&self) -> u64 {
        self.trex.iter().map(|b| b.size()).sum::<u64>()
            + self.mehd.iter().map(|b| b.size()).sum::<u64>()
            + self.unknown.iter().map(|b| b.size()).sum::<u64>()
    }

    fn primitive_mux<T: io::Write>(&self, writer: &mut T) -> io::Result<()> {
        for b in &self.trex {
            b.mux(writer)?;
        }

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

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

        Ok(())
    }
}