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
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130

use serde::Serialize;
use std::io::{Read, Seek, Write};

use crate::meta::MetaBox;
use crate::mp4box::*;
use crate::mp4box::{edts::EdtsBox, mdia::MdiaBox, tkhd::TkhdBox};

#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
pub struct TrakBox {
    pub tkhd: TkhdBox,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub edts: Option<EdtsBox>,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub meta: Option<MetaBox>,

    pub mdia: MdiaBox,
}

impl TrakBox {
    pub fn get_type(&self) -> BoxType {
        BoxType::TrakBox
    }

    pub fn get_size(&self) -> u64 {
        let mut size = HEADER_SIZE;
        size += self.tkhd.box_size();
        if let Some(ref edts) = self.edts {
            size += edts.box_size();
        }
        size += self.mdia.box_size();
        size
    }
}

impl Mp4Box for TrakBox {
    fn box_type(&self) -> BoxType {
        self.get_type()
    }

    fn box_size(&self) -> u64 {
        self.get_size()
    }

    fn to_json(&self) -> Result<String> {
        Ok(serde_json::to_string(&self).unwrap())
    }

    fn summary(&self) -> Result<String> {
        let s = String::new();
        Ok(s)
    }
}

impl<R: Read + Seek> ReadBox<&mut R> for TrakBox {
    fn read_box(reader: &mut R, size: u64) -> Result<Self> {
        let start = box_start(reader)?;

        let mut tkhd = None;
        let mut edts = None;
        let mut meta = None;
        let mut mdia = None;

        let mut current = reader.stream_position()?;
        let end = start + size;
        while current < end {
            // Get box header.
            let header = BoxHeader::read(reader)?;
            let BoxHeader { name, size: s } = header;
            if s > size {
                return Err(Error::InvalidData(
                    "trak box contains a box with a larger size than it",
                ));
            }

            match name {
                BoxType::TkhdBox => {
                    tkhd = Some(TkhdBox::read_box(reader, s)?);
                }
                BoxType::EdtsBox => {
                    edts = Some(EdtsBox::read_box(reader, s)?);
                }
                BoxType::MetaBox => {
                    meta = Some(MetaBox::read_box(reader, s)?);
                }
                BoxType::MdiaBox => {
                    mdia = Some(MdiaBox::read_box(reader, s)?);
                }
                _ => {
                    // XXX warn!()
                    skip_box(reader, s)?;
                }
            }

            current = reader.stream_position()?;
        }

        if tkhd.is_none() {
            return Err(Error::BoxNotFound(BoxType::TkhdBox));
        }
        if mdia.is_none() {
            return Err(Error::BoxNotFound(BoxType::MdiaBox));
        }

        skip_bytes_to(reader, start + size)?;

        Ok(TrakBox {
            tkhd: tkhd.unwrap(),
            edts,
            meta,
            mdia: mdia.unwrap(),
        })
    }
}

impl<W: Write> WriteBox<&mut W> for TrakBox {
    fn write_box(&self, writer: &mut W) -> Result<u64> {
        let size = self.box_size();
        BoxHeader::new(self.box_type(), size).write(writer)?;

        self.tkhd.write_box(writer)?;
        if let Some(ref edts) = self.edts {
            edts.write_box(writer)?;
        }
        self.mdia.write_box(writer)?;

        Ok(size)
    }
}