scuffle_mp4/boxes/types/
stdp.rs

1use std::io;
2
3use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
4use bytes::{Buf, Bytes};
5
6use crate::boxes::header::{BoxHeader, FullBoxHeader};
7use crate::boxes::traits::BoxType;
8
9#[derive(Debug, Clone, PartialEq)]
10/// Sample Degradation Priority Box
11/// ISO/IEC 14496-12:2022(E) - 8.7.6
12pub struct Stdp {
13    pub header: FullBoxHeader,
14    pub samples: Vec<u16>,
15}
16
17impl BoxType for Stdp {
18    const NAME: [u8; 4] = *b"stdp";
19
20    fn demux(header: BoxHeader, data: Bytes) -> io::Result<Self> {
21        let mut reader = io::Cursor::new(data);
22
23        let header = FullBoxHeader::demux(header, &mut reader)?;
24
25        let mut samples = Vec::new();
26
27        while reader.remaining() > 1 {
28            let sample = reader.read_u16::<BigEndian>()?;
29            samples.push(sample);
30        }
31
32        Ok(Self { header, samples })
33    }
34
35    fn primitive_size(&self) -> u64 {
36        let size = self.header.size();
37        // samples
38        size + (self.samples.len() as u64) * 2
39    }
40
41    fn primitive_mux<T: io::Write>(&self, writer: &mut T) -> io::Result<()> {
42        self.header.mux(writer)?;
43
44        for sample in &self.samples {
45            writer.write_u16::<BigEndian>(*sample)?;
46        }
47
48        Ok(())
49    }
50
51    fn validate(&self) -> io::Result<()> {
52        if self.header.version != 0 {
53            return Err(io::Error::new(io::ErrorKind::InvalidData, "stdp version must be 0"));
54        }
55
56        if self.header.flags != 0 {
57            return Err(io::Error::new(io::ErrorKind::InvalidData, "stdp flags must be 0"));
58        }
59
60        Ok(())
61    }
62}
scuffle_mp4/boxes/types/stdp.rs

scuffle_mp4/boxes/types/
stdp.rs
