scuffle_mp4/boxes/types/
mdia.rs

use std::io;

use bytes::{Buf, Bytes};

use super::hdlr::Hdlr;
use super::mdhd::Mdhd;
use super::minf::Minf;
use crate::boxes::header::BoxHeader;
use crate::boxes::traits::BoxType;
use crate::boxes::DynBox;

#[derive(Debug, Clone, PartialEq)]
/// Media Box
/// ISO/IEC 14496-12:2022(E) - 8.4
pub struct Mdia {
    pub header: BoxHeader,
    pub mdhd: Mdhd,
    pub hdlr: Hdlr,
    pub minf: Minf,
    pub unknown: Vec<DynBox>,
}

impl Mdia {
    pub fn new(mdhd: Mdhd, hdlr: Hdlr, minf: Minf) -> Self {
        Self {
            header: BoxHeader::new(Self::NAME),
            mdhd,
            hdlr,
            minf,
            unknown: Vec::new(),
        }
    }
}

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

    fn demux(header: BoxHeader, data: Bytes) -> io::Result<Self> {
        let mut reader = io::Cursor::new(data);
        let mut mdhd = None;
        let mut hdlr = None;
        let mut minf = None;
        let mut unknown = Vec::new();

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

            match dyn_box {
                DynBox::Mdhd(b) => {
                    mdhd = Some(*b);
                }
                DynBox::Hdlr(b) => {
                    hdlr = Some(*b);
                }
                DynBox::Minf(b) => {
                    minf = Some(*b);
                }
                _ => {
                    unknown.push(dyn_box);
                }
            }
        }

        let mdhd = mdhd.ok_or_else(|| io::Error::new(io::ErrorKind::InvalidData, "mdia box is missing mdhd box"))?;

        let hdlr = hdlr.ok_or_else(|| io::Error::new(io::ErrorKind::InvalidData, "mdia box is missing hdlr box"))?;

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

        Ok(Self {
            header,
            mdhd,
            hdlr,
            minf,
            unknown,
        })
    }

    fn primitive_size(&self) -> u64 {
        self.mdhd.size() // mdhd
        + self.hdlr.size() // hdlr
        + self.minf.size() // minf
        + self.unknown.iter().map(|b| b.size()).sum::<u64>() // unknown boxes
    }

    fn primitive_mux<W: io::Write>(&self, writer: &mut W) -> io::Result<()> {
        self.mdhd.mux(writer)?;
        self.hdlr.mux(writer)?;
        self.minf.mux(writer)?;

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

        Ok(())
    }
}
scuffle_mp4/boxes/types/mdia.rs

scuffle_mp4/boxes/types/
mdia.rs
