1 files changed, 52 insertions, 0 deletions
diff --git a/src/boxes/ftyp.rs b/src/boxes/ftyp.rs
new file mode 100644
index 0000000..f959e51
--- /dev/null
+++ b/src/boxes/ftyp.rs
@@ -0,0 +1,52 @@
+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(())
+    }
+}