1 files changed, 42 insertions, 0 deletions
diff --git a/src/boxes/stsz.rs b/src/boxes/stsz.rs
new file mode 100644
index 0000000..7dc3eba
--- /dev/null
+++ b/src/boxes/stsz.rs
@@ -0,0 +1,42 @@
+use byteorder::{BigEndian, WriteBytesExt};
+use four_cc::FourCC;
+
+use bytes::{BufMut, BytesMut};
+
+use crate::Mp4BoxError;
+use crate::{FullBoxHeader, Mp4Box};
+
+use std::mem::size_of;
+
+pub struct SampleSizeBox {
+    pub sample_sizes: Vec<u32>,
+}
+
+impl Mp4Box for SampleSizeBox {
+    const NAME: FourCC = FourCC(*b"stsz");
+
+    fn get_full_box_header(&self) -> Option<FullBoxHeader> {
+        Some(FullBoxHeader::new(0, 0))
+    }
+
+    fn content_size(&self) -> u64 {
+        size_of::<u32>() as u64
+            + size_of::<u32>() as u64
+            + size_of::<u32>() as u64 * self.sample_sizes.len() as u64
+    }
+
+    fn write_box_contents(&self, writer: &mut BytesMut) -> Result<(), Mp4BoxError> {
+        let mut v = Vec::new();
+
+        v.write_u32::<BigEndian>(0)?;
+        v.write_u32::<BigEndian>(self.sample_sizes.len() as u32)?;
+
+        for &size in &self.sample_sizes {
+            v.write_u32::<BigEndian>(size)?;
+        }
+
+        writer.put_slice(&v);
+
+        Ok(())
+    }
+}