Encode Timecodes into WebM stub

src/bin/stub.rs

@@ -10,6 +10,10 @@ pub fn main() {
     encode_webm_element(WebmElement::Segment, &mut cursor).unwrap();
 
     encode_webm_element(WebmElement::Cluster, &mut cursor).unwrap();
+    encode_webm_element(WebmElement::Timecode(0), &mut cursor).unwrap();
+
+    encode_webm_element(WebmElement::Cluster, &mut cursor).unwrap();
+    encode_webm_element(WebmElement::Timecode(1000), &mut cursor).unwrap();
 
     stdout().write_all(&cursor.get_ref()).unwrap();
 }

src/ebml.rs

@@ -202,6 +202,15 @@ pub fn encode_string<T: Write>(tag: u64, string: &str, output: &mut T) -> IoResu
     encode_tag_header(tag, Varint::Value(string.len() as u64), output)?;
     output.write_all(string.as_ref())
 }
+
+/// Tries to write a simple EBML tag with an integer value
+pub fn encode_integer<T: Write>(tag: u64, value: u64, output: &mut T) -> IoResult<()> {
+    encode_tag_header(tag, Varint::Value(8), output)?;
+
+    let mut buffer = Cursor::new([0; 8]);
+    buffer.put_u64::<BigEndian>(value);
+
+    output.write_all(&buffer.get_ref()[..])
 }
 
 #[derive(Debug, PartialEq)]

src/webm.rs

@@ -89,6 +89,7 @@ pub fn encode_webm_element<T: Write + Seek>(element: WebmElement, output: &mut T
         WebmElement::SeekHead => Ok(()),
         WebmElement::Cues => Ok(()),
         WebmElement::Cluster => encode_tag_header(CLUSTER_ID, Varint::Unknown, output),
+        WebmElement::Timecode(time) => encode_integer(TIMECODE_ID, time, output),
         _ => Err(IoError::new(ErrorKind::InvalidInput, WriteError::OutOfRange))
     }
 }