From 9e6e4962f2346a3fbd96ab3e6c331858ef6ec0d1 Mon Sep 17 00:00:00 2001
From: Felix Kaaman <tmtu@tmtu.ee>
Date: Thu, 7 Jan 2021 20:32:49 +0100
Subject: Initial commit

---
 src/boxes/trex.rs | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 src/boxes/trex.rs

(limited to 'src/boxes/trex.rs')

diff --git a/src/boxes/trex.rs b/src/boxes/trex.rs
new file mode 100644
index 0000000..fa9f496
--- /dev/null
+++ b/src/boxes/trex.rs
@@ -0,0 +1,47 @@
+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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