scuffle_mp4/boxes/types/
stco.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/// Sample Table Chunk Offset Box
11/// ISO/IEC 14496-12:2022(E) - 8.7.5
12pub struct Stco {
13    pub header: FullBoxHeader,
14    pub entries: Vec<u32>,
15}
16
17impl Stco {
18    pub fn new(entries: Vec<u32>) -> Self {
19        Self {
20            header: FullBoxHeader::new(Self::NAME, 0, 0),
21            entries,
22        }
23    }
24}
25
26impl BoxType for Stco {
27    const NAME: [u8; 4] = *b"stco";
28
29    fn demux(header: BoxHeader, data: Bytes) -> io::Result<Self> {
30        let mut reader = io::Cursor::new(data);
31
32        let header = FullBoxHeader::demux(header, &mut reader)?;
33
34        let entry_count = reader.read_u32::<BigEndian>()?;
35        let mut entries = Vec::with_capacity(entry_count as usize);
36        for _ in 0..entry_count {
37            let offset = reader.read_u32::<BigEndian>()?;
38            entries.push(offset);
39        }
40
41        Ok(Self { header, entries })
42    }
43
44    fn primitive_size(&self) -> u64 {
45        let size = self.header.size();
46        let size = size + 4; // entry_count
47        // entries
48        size + (self.entries.len() as u64 * 4)
49    }
50
51    fn primitive_mux<T: io::Write>(&self, writer: &mut T) -> io::Result<()> {
52        self.header.mux(writer)?;
53
54        writer.write_u32::<BigEndian>(self.entries.len() as u32)?;
55        for offset in &self.entries {
56            writer.write_u32::<BigEndian>(*offset)?;
57        }
58
59        Ok(())
60    }
61
62    fn validate(&self) -> io::Result<()> {
63        if self.header.version != 0 {
64            return Err(io::Error::new(io::ErrorKind::InvalidData, "stco box version must be 0"));
65        }
66
67        if self.header.flags != 0 {
68            return Err(io::Error::new(io::ErrorKind::InvalidData, "stco box flags must be 0"));
69        }
70
71        Ok(())
72    }
73}
scuffle_mp4/boxes/types/stco.rs

scuffle_mp4/boxes/types/
stco.rs
