scuffle_mp4/boxes/types/
stss.rs

1use std::io;
2
3use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
4use bytes::Bytes;
5
6use crate::boxes::header::{BoxHeader, FullBoxHeader};
7use crate::boxes::traits::BoxType;
8
9#[derive(Debug, Clone, PartialEq)]
10/// Sync Sample Box
11/// ISO/IEC 14496-12:2022(E) - 8.6.2
12pub struct Stss {
13    pub header: FullBoxHeader,
14    pub entries: Vec<u32>,
15}
16
17impl BoxType for Stss {
18    const NAME: [u8; 4] = *b"stss";
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 entry_count = reader.read_u32::<BigEndian>()?;
26        let mut entries = Vec::with_capacity(entry_count as usize);
27        for _ in 0..entry_count {
28            let offset = reader.read_u32::<BigEndian>()?;
29            entries.push(offset);
30        }
31
32        Ok(Self { header, entries })
33    }
34
35    fn primitive_size(&self) -> u64 {
36        let size = self.header.size();
37        let size = size + 4; // entry_count
38        // entries
39        size + (self.entries.len() as u64 * 4)
40    }
41
42    fn primitive_mux<T: io::Write>(&self, writer: &mut T) -> io::Result<()> {
43        self.header.mux(writer)?;
44
45        writer.write_u32::<BigEndian>(self.entries.len() as u32)?;
46        for offset in &self.entries {
47            writer.write_u32::<BigEndian>(*offset)?;
48        }
49
50        Ok(())
51    }
52
53    fn validate(&self) -> io::Result<()> {
54        if self.header.version != 0 {
55            return Err(io::Error::new(io::ErrorKind::InvalidData, "stss version must be 0"));
56        }
57
58        if self.header.flags != 0 {
59            return Err(io::Error::new(io::ErrorKind::InvalidData, "stss flags must be 0"));
60        }
61
62        Ok(())
63    }
64}
scuffle_mp4/boxes/types/stss.rs

scuffle_mp4/boxes/types/
stss.rs
