mp4/mp4box/
tfdt.rs

1use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
2use serde::Serialize;
3use std::io::{Read, Seek, Write};
4
5use crate::mp4box::*;
6
7#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
8pub struct TfdtBox {
9    pub version: u8,
10    pub flags: u32,
11    pub base_media_decode_time: u64,
12}
13
14impl TfdtBox {
15    pub fn get_type(&self) -> BoxType {
16        BoxType::TfdtBox
17    }
18
19    pub fn get_size(&self) -> u64 {
20        let mut sum = HEADER_SIZE + HEADER_EXT_SIZE;
21        if self.version == 1 {
22            sum += 8;
23        } else {
24            sum += 4;
25        }
26        sum
27    }
28}
29
30impl Mp4Box for TfdtBox {
31    fn box_type(&self) -> BoxType {
32        self.get_type()
33    }
34
35    fn box_size(&self) -> u64 {
36        self.get_size()
37    }
38
39    fn to_json(&self) -> Result<String> {
40        Ok(serde_json::to_string(&self).unwrap())
41    }
42
43    fn summary(&self) -> Result<String> {
44        let s = format!("base_media_decode_time={}", self.base_media_decode_time);
45        Ok(s)
46    }
47}
48
49impl<R: Read + Seek> ReadBox<&mut R> for TfdtBox {
50    fn read_box(reader: &mut R, size: u64) -> Result<Self> {
51        let start = box_start(reader)?;
52
53        let (version, flags) = read_box_header_ext(reader)?;
54
55        let base_media_decode_time = if version == 1 {
56            reader.read_u64::<BigEndian>()?
57        } else if version == 0 {
58            reader.read_u32::<BigEndian>()? as u64
59        } else {
60            return Err(Error::InvalidData("version must be 0 or 1"));
61        };
62
63        skip_bytes_to(reader, start + size)?;
64
65        Ok(TfdtBox {
66            version,
67            flags,
68            base_media_decode_time,
69        })
70    }
71}
72
73impl<W: Write> WriteBox<&mut W> for TfdtBox {
74    fn write_box(&self, writer: &mut W) -> Result<u64> {
75        let size = self.box_size();
76        BoxHeader::new(self.box_type(), size).write(writer)?;
77
78        write_box_header_ext(writer, self.version, self.flags)?;
79
80        if self.version == 1 {
81            writer.write_u64::<BigEndian>(self.base_media_decode_time)?;
82        } else if self.version == 0 {
83            writer.write_u32::<BigEndian>(self.base_media_decode_time as u32)?;
84        } else {
85            return Err(Error::InvalidData("version must be 0 or 1"));
86        }
87
88        Ok(size)
89    }
90}
91
92#[cfg(test)]
93mod tests {
94    use super::*;
95    use crate::mp4box::BoxHeader;
96    use std::io::Cursor;
97
98    #[test]
99    fn test_tfdt32() {
100        let src_box = TfdtBox {
101            version: 0,
102            flags: 0,
103            base_media_decode_time: 0,
104        };
105        let mut buf = Vec::new();
106        src_box.write_box(&mut buf).unwrap();
107        assert_eq!(buf.len(), src_box.box_size() as usize);
108
109        let mut reader = Cursor::new(&buf);
110        let header = BoxHeader::read(&mut reader).unwrap();
111        assert_eq!(header.name, BoxType::TfdtBox);
112        assert_eq!(src_box.box_size(), header.size);
113
114        let dst_box = TfdtBox::read_box(&mut reader, header.size).unwrap();
115        assert_eq!(src_box, dst_box);
116    }
117
118    #[test]
119    fn test_tfdt64() {
120        let src_box = TfdtBox {
121            version: 1,
122            flags: 0,
123            base_media_decode_time: 0,
124        };
125        let mut buf = Vec::new();
126        src_box.write_box(&mut buf).unwrap();
127        assert_eq!(buf.len(), src_box.box_size() as usize);
128
129        let mut reader = Cursor::new(&buf);
130        let header = BoxHeader::read(&mut reader).unwrap();
131        assert_eq!(header.name, BoxType::TfdtBox);
132        assert_eq!(src_box.box_size(), header.size);
133
134        let dst_box = TfdtBox::read_box(&mut reader, header.size).unwrap();
135        assert_eq!(src_box, dst_box);
136    }
137}
mp4/mp4box/tfdt.rs

mp4/mp4box/
tfdt.rs
