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use byteorder::{BigEndian, WriteBytesExt};
use four_cc::FourCC;
use bytes::{BufMut, BytesMut};
use std::io::Write;
use std::mem::size_of;
use crate::{Mp4Box, Mp4BoxError};
pub struct FileTypeBox {
major_brand: FourCC,
minor_version: u32,
compatible_brands: Vec<FourCC>,
}
impl FileTypeBox {
pub fn new(major_brand: FourCC, minor_version: u32, compatible_brands: Vec<FourCC>) -> Self {
FileTypeBox {
major_brand,
minor_version,
compatible_brands,
}
}
}
impl Mp4Box for FileTypeBox {
const NAME: FourCC = FourCC(*b"ftyp");
fn content_size(&self) -> u64 {
size_of::<u32>() as u64 + // major_brand
size_of::<u32>() as u64 + // minor_version
size_of::<u32>() as u64 * self.compatible_brands.len() as u64 // compatible_brands
}
fn write_box_contents(&self, writer: &mut BytesMut) -> Result<(), Mp4BoxError> {
let mut v = Vec::new();
Write::write_all(&mut v, &self.major_brand.0)?;
v.write_u32::<BigEndian>(self.minor_version)?;
for brand in &self.compatible_brands {
Write::write_all(&mut v, &brand.0)?;
}
assert_eq!(self.content_size() as usize, v.len());
writer.put_slice(&v);
Ok(())
}
}
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