scuffle_mp4/boxes/types/
mfhd.rs

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use std::io;

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

use crate::boxes::header::{BoxHeader, FullBoxHeader};
use crate::boxes::traits::BoxType;

#[derive(Debug, Clone, PartialEq)]
/// Movie Fragment Header Box
/// ISO/IEC 14496-12:2022(E) - 8.8.5
pub struct Mfhd {
    pub header: FullBoxHeader,
    pub sequence_number: u32,
}

impl Mfhd {
    pub fn new(sequence_number: u32) -> Self {
        Self {
            header: FullBoxHeader::new(Self::NAME, 0, 0),
            sequence_number,
        }
    }
}

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

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

        let header = FullBoxHeader::demux(header, &mut reader)?;

        let sequence_number = reader.read_u32::<BigEndian>()?;

        Ok(Self { header, sequence_number })
    }

    fn primitive_size(&self) -> u64 {
        self.header.size() + 4 // sequence_number
    }

    fn primitive_mux<T: io::Write>(&self, writer: &mut T) -> io::Result<()> {
        self.header.mux(writer)?;
        writer.write_u32::<BigEndian>(self.sequence_number)?;

        Ok(())
    }

    fn validate(&self) -> io::Result<()> {
        if self.header.version != 0 {
            return Err(io::Error::new(io::ErrorKind::InvalidData, "mfhd box version must be 0"));
        }

        if self.header.flags != 0 {
            return Err(io::Error::new(io::ErrorKind::InvalidData, "mfhd box flags must be 0"));
        }

        Ok(())
    }
}