scuffle_mp4/boxes/types/
trak.rs

use std::io;

use bytes::{Buf, Bytes};

use super::edts::Edts;
use super::mdia::Mdia;
use super::tkhd::Tkhd;
use crate::boxes::header::BoxHeader;
use crate::boxes::traits::BoxType;
use crate::boxes::DynBox;

#[derive(Debug, Clone, PartialEq)]
/// Track Box
/// ISO/IEC 14496-12:2022(E) - 8.3.1
pub struct Trak {
    pub header: BoxHeader,
    pub tkhd: Tkhd,
    pub edts: Option<Edts>,
    pub mdia: Mdia,
    pub unknown: Vec<DynBox>,
}

impl Trak {
    pub fn new(tkhd: Tkhd, edts: Option<Edts>, mdia: Mdia) -> Self {
        Self {
            header: BoxHeader::new(Self::NAME),
            tkhd,
            edts,
            mdia,
            unknown: Vec::new(),
        }
    }
}

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

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

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

            match dyn_box {
                DynBox::Tkhd(b) => {
                    tkhd = Some(*b);
                }
                DynBox::Edts(b) => {
                    edts = Some(*b);
                }
                DynBox::Mdia(b) => {
                    mdia = Some(*b);
                }
                _ => {
                    unknown.push(dyn_box);
                }
            }
        }

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

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

        Ok(Self {
            header,
            tkhd,
            edts,
            mdia,
            unknown,
        })
    }

    fn primitive_size(&self) -> u64 {
        self.tkhd.size()
            + self.edts.as_ref().map(|b| b.size()).unwrap_or(0)
            + self.mdia.size()
            + self.unknown.iter().map(|b| b.size()).sum::<u64>()
    }

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

        self.mdia.mux(writer)?;

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

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

scuffle_mp4/boxes/types/
trak.rs
