mp4-rust/src/atoms/minf.rs

use std::io::{BufReader, SeekFrom, Seek, Read, BufWriter, Write};

use crate::*;
use crate::atoms::{vmhd::VmhdBox, stbl::StblBox};


#[derive(Debug, Default)]
pub struct MinfBox {
    pub vmhd: Option<VmhdBox>,
    pub stbl: Option<StblBox>,
}

impl MinfBox {
    pub(crate) fn new() -> MinfBox {
        Default::default()
    }
}

impl Mp4Box for MinfBox {
    fn box_type(&self) -> BoxType {
        BoxType::MinfBox
    }

    fn box_size(&self) -> u64 {
        let mut size = HEADER_SIZE;
        if let Some(vmhd) = &self.vmhd {
            size += vmhd.box_size();
        }
        if let Some(stbl) = &self.stbl {
            size += stbl.box_size();
        }
        size
    }
}

impl<R: Read + Seek> ReadBox<&mut BufReader<R>> for MinfBox {
    fn read_box(reader: &mut BufReader<R>, size: u64) -> Result<Self> {
        let current = reader.seek(SeekFrom::Current(0))?; // Current cursor position.
        let mut minf = MinfBox::new();

        let mut start = 0u64;
        while start < size {
            // Get box header.
            let header = read_box_header(reader, start)?;
            let BoxHeader{ name, size: s } = header;

            match name {
                BoxType::VmhdBox => {
                    let vmhd = VmhdBox::read_box(reader, s)?;
                    minf.vmhd = Some(vmhd);
                }
                BoxType::SmhdBox => {
                    start = s - HEADER_SIZE;
                }
                BoxType::DinfBox => {
                    start = s - HEADER_SIZE;
                }
                BoxType::StblBox => {
                    let stbl = StblBox::read_box(reader, s)?;
                    minf.stbl = Some(stbl);
                }
                _ => break
            }
        }
        skip_read(reader, current, size)?;

        Ok(minf)
    }
}

impl<W: Write> WriteBox<&mut BufWriter<W>> for MinfBox {
    fn write_box(&self, writer: &mut BufWriter<W>) -> Result<u64> {
        let size = self.box_size();
        BoxHeader::new(self.box_type(), size).write_box(writer)?;

        if let Some(vmhd) = &self.vmhd {
            vmhd.write_box(writer)?;
        }
        if let Some(stbl) = &self.stbl {
            stbl.write_box(writer)?;
        }

        Ok(size)
    }
}