scuffle_mp4/boxes/types/
trex.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)]
/// Track Extends Box
/// ISO/IEC 14496-12:2022(E) - 8.8.3
pub struct Trex {
    pub header: FullBoxHeader,
    pub track_id: u32,
    pub default_sample_description_index: u32,
    pub default_sample_duration: u32,
    pub default_sample_size: u32,
    pub default_sample_flags: u32,
}

impl Trex {
    pub fn new(track_id: u32) -> Self {
        Self {
            header: FullBoxHeader::new(Self::NAME, 0, 0),
            track_id,
            default_sample_description_index: 1,
            default_sample_duration: 0,
            default_sample_size: 0,
            default_sample_flags: 0,
        }
    }
}

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

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

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

        let track_id = reader.read_u32::<BigEndian>()?;
        let default_sample_description_index = reader.read_u32::<BigEndian>()?;
        let default_sample_duration = reader.read_u32::<BigEndian>()?;
        let default_sample_size = reader.read_u32::<BigEndian>()?;
        let default_sample_flags = reader.read_u32::<BigEndian>()?;

        Ok(Self {
            header,

            track_id,
            default_sample_description_index,
            default_sample_duration,
            default_sample_size,
            default_sample_flags,
        })
    }

    fn primitive_size(&self) -> u64 {
        let size = self.header.size();
        let size = size + 4; // track_id
        let size = size + 4; // default_sample_description_index
        let size = size + 4; // default_sample_duration
        let size = size + 4; // default_sample_size
                             // default_sample_flags
        size + 4
    }

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

        writer.write_u32::<BigEndian>(self.track_id)?;
        writer.write_u32::<BigEndian>(self.default_sample_description_index)?;
        writer.write_u32::<BigEndian>(self.default_sample_duration)?;
        writer.write_u32::<BigEndian>(self.default_sample_size)?;
        writer.write_u32::<BigEndian>(self.default_sample_flags)?;

        Ok(())
    }

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

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

        Ok(())
    }
}