mp4_atom/moov/trak/mdia/minf/
smhd.rs

1use crate::*;
2
3#[derive(Debug, Clone, PartialEq, Eq, Default)]
4#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
5pub struct Smhd {
6    pub balance: FixedPoint<i8>,
7}
8
9impl AtomExt for Smhd {
10    type Ext = ();
11
12    const KIND_EXT: FourCC = FourCC::new(b"smhd");
13
14    fn decode_body_ext<B: Buf>(buf: &mut B, _ext: ()) -> Result<Self> {
15        let balance = FixedPoint::decode(buf)?;
16        u16::decode(buf)?; // reserved?
17
18        Ok(Smhd { balance })
19    }
20
21    fn encode_body_ext<B: BufMut>(&self, buf: &mut B) -> Result<()> {
22        self.balance.encode(buf)?;
23        0u16.encode(buf)?; // reserved
24
25        Ok(())
26    }
27}
28
29#[cfg(test)]
30mod tests {
31    use super::*;
32
33    #[test]
34    fn test_smhd() {
35        let expected = Smhd {
36            balance: FixedPoint::from(-1),
37        };
38        let mut buf = Vec::new();
39        expected.encode(&mut buf).unwrap();
40
41        let mut buf = buf.as_ref();
42        let decoded = Smhd::decode(&mut buf).unwrap();
43        assert_eq!(decoded, expected);
44    }
45}
mp4_atom/moov/trak/mdia/minf/smhd.rs

mp4_atom/moov/trak/mdia/minf/
smhd.rs
