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use byteorder::{BigEndian, ByteOrder};
use four_cc::FourCC;
use bytes::{BufMut, BytesMut};
use crate::Mp4BoxError;
use crate::{FullBoxHeader, Mp4Box};
use std::mem::size_of;
pub struct TrackExtendsBox {
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 Mp4Box for TrackExtendsBox {
const NAME: FourCC = FourCC(*b"trex");
fn get_full_box_header(&self) -> Option<FullBoxHeader> {
Some(FullBoxHeader::new(0, 0))
}
fn content_size(&self) -> u64 {
size_of::<u32>() as u64 + // track_ID
size_of::<u32>() as u64 + // default_sample_description_index
size_of::<u32>() as u64 + // default_sample_duration
size_of::<u32>() as u64 + // default_sample_size
size_of::<u32>() as u64 // default_sample_flags
}
fn write_box_contents(&self, writer: &mut BytesMut) -> Result<(), Mp4BoxError> {
let mut contents = [0u8; 20];
BigEndian::write_u32(&mut contents[..], self.track_id);
BigEndian::write_u32(&mut contents[4..], self.default_sample_description_index);
BigEndian::write_u32(&mut contents[8..], self.default_sample_duration);
BigEndian::write_u32(&mut contents[12..], self.default_sample_size);
BigEndian::write_u32(&mut contents[16..], self.default_sample_flags);
writer.put_slice(&contents);
Ok(())
}
}
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