scuffle_mp4/boxes/types/
hmhd.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)]
/// Hint Media Header Box
/// ISO/IEC 14496-12:2022(E) - 12.4.3
pub struct Hmhd {
    pub header: FullBoxHeader,
    pub max_pdu_size: u16,
    pub avg_pdu_size: u16,
    pub max_bitrate: u32,
    pub avg_bitrate: u32,
    pub reserved: u32,
}

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

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

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

        let max_pdu_size = reader.read_u16::<BigEndian>()?;
        let avg_pdu_size = reader.read_u16::<BigEndian>()?;
        let max_bitrate = reader.read_u32::<BigEndian>()?;
        let avg_bitrate = reader.read_u32::<BigEndian>()?;
        let reserved = reader.read_u32::<BigEndian>()?;

        Ok(Self {
            header,
            max_pdu_size,
            avg_pdu_size,
            max_bitrate,
            avg_bitrate,
            reserved,
        })
    }

    fn primitive_size(&self) -> u64 {
        self.header.size()
        + 2 // max_pdu_size
        + 2 // avg_pdu_size
        + 4 // max_bitrate
        + 4 // avg_bitrate
        + 4 // reserved
    }

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

        writer.write_u16::<BigEndian>(self.max_pdu_size)?;
        writer.write_u16::<BigEndian>(self.avg_pdu_size)?;
        writer.write_u32::<BigEndian>(self.max_bitrate)?;
        writer.write_u32::<BigEndian>(self.avg_bitrate)?;
        writer.write_u32::<BigEndian>(self.reserved)?;

        Ok(())
    }

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

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

        if self.reserved != 0 {
            return Err(io::Error::new(io::ErrorKind::InvalidData, "hmhd reserved must be 0"));
        }

        Ok(())
    }
}