mp4ameta 0.13.0

A library for reading and writing iTunes style MPEG-4 audio metadata.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82

use super::*;

#[derive(Clone, Debug, Default, PartialEq, Eq)]
pub struct Hdlr {
    pub state: State,
    pub data: Cow<'static, [u8]>,
}

impl Atom for Hdlr {
    const FOURCC: Fourcc = HANDLER_REFERENCE;
}

impl ParseAtom for Hdlr {
    fn parse_atom(
        reader: &mut (impl Read + Seek),
        _cfg: &ParseConfig<'_>,
        size: Size,
    ) -> crate::Result<Self> {
        let bounds = find_bounds(reader, size)?;
        let data = reader.read_u8_vec(size.content_len())?;
        Ok(Self {
            state: State::Existing(bounds),
            data: Cow::Owned(data),
        })
    }
}

impl AtomSize for Hdlr {
    fn size(&self) -> Size {
        Size::from(self.data.len() as u64)
    }
}

impl WriteAtom for Hdlr {
    fn write_atom(&self, writer: &mut impl Write, _changes: &[Change<'_>]) -> crate::Result<()> {
        self.write_head(writer)?;
        writer.write_all(&self.data)?;
        Ok(())
    }
}

impl LeafAtomCollectChanges for Hdlr {
    fn state(&self) -> &State {
        &self.state
    }

    fn atom_ref(&self) -> AtomRef<'_> {
        AtomRef::Hdlr(self)
    }
}

impl Hdlr {
    pub fn meta() -> Self {
        Self {
            state: State::Insert,
            data: Cow::Borrowed(&[
                0x00, 0x00, 0x00, 0x00, // version + flags
                0x00, 0x00, 0x00, 0x00, // component type
                0x6d, 0x64, 0x69, 0x72, // component subtype
                0x61, 0x70, 0x70, 0x6c, // component manufacturer
                0x00, 0x00, 0x00, 0x00, // component flags
                0x00, 0x00, 0x00, 0x00, // component flags mask
                0x00, // component name
            ]),
        }
    }

    pub fn text_mdia() -> Self {
        Self {
            state: State::Insert,
            data: Cow::Borrowed(&[
                0x00, 0x00, 0x00, 0x00, // version + flags
                0x00, 0x00, 0x00, 0x00, // component type
                0x74, 0x65, 0x78, 0x74, // component subtype
                0x00, 0x00, 0x00, 0x00, // component manufacturer
                0x00, 0x00, 0x00, 0x00, // component flags
                0x00, 0x00, 0x00, 0x00, // component flags mask
                0x00, // component name
            ]),
        }
    }
}