1 files changed, 45 insertions, 0 deletions
diff --git a/src/boxes/co64.rs b/src/boxes/co64.rs
new file mode 100644
index 0000000..d52c4b0
--- /dev/null
+++ b/src/boxes/co64.rs
@@ -0,0 +1,45 @@
+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 SampleToChunkEntry {
+    first_chunk: u32,
+    samples_per_chunk: u32,
+    sample_description_index: u32,
+}
+
+pub struct ChunkLargeOffsetBox {
+    pub chunk_offsets: Vec<u64>,
+}
+
+impl Mp4Box for ChunkLargeOffsetBox {
+    const NAME: FourCC = FourCC(*b"co64");
+
+    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::<u64>() as u64) * self.chunk_offsets.len() as u64
+    }
+
+    fn write_box_contents(&self, writer: &mut BytesMut) -> Result<(), Mp4BoxError> {
+        let mut v = Vec::new();
+
+        v.write_u32::<BigEndian>(self.chunk_offsets.len() as u32)?;
+
+        for &chunk_offset in &self.chunk_offsets {
+            v.write_u64::<BigEndian>(chunk_offset)?;
+        }
+
+        writer.put_slice(&v);
+
+        Ok(())
+    }
+}