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
|
use byteorder::{BigEndian, ByteOrder};
use four_cc::FourCC;
use bytes::{BufMut, BytesMut};
use crate::Mp4BoxError;
use crate::{FullBoxHeader, Mp4Box};
use std::mem::size_of;
pub struct TrackHeaderBox {
pub creation_time: u64,
pub modification_time: u64,
pub track_id: u32,
pub duration: u64,
}
impl Mp4Box for TrackHeaderBox {
const NAME: FourCC = FourCC(*b"tkhd");
fn get_full_box_header(&self) -> Option<FullBoxHeader> {
Some(FullBoxHeader::new(1, 0)) // TODO: flags matter
}
fn content_size(&self) -> u64 {
size_of::<u64>() as u64 + // creation_time
size_of::<u64>() as u64 + // modification_time
size_of::<u32>() as u64 + // track_ID
size_of::<u32>() as u64 + // reserved
size_of::<u64>() as u64 + // duration
size_of::<u32>() as u64 * 2 + // reserved
size_of::<u16>() as u64 + // layer
size_of::<u16>() as u64 + // alternate_group
size_of::<u16>() as u64 + // volume
size_of::<u16>() as u64 + // reserved
size_of::<i32>() as u64 * 9 + // matrix
size_of::<u32>() as u64 + // width
size_of::<u32>() as u64 // height
}
fn write_box_contents(&self, writer: &mut BytesMut) -> Result<(), Mp4BoxError> {
let mut contents = [0u8; 92];
BigEndian::write_u64(&mut contents[..], self.creation_time);
BigEndian::write_u64(&mut contents[8..], self.modification_time);
BigEndian::write_u32(&mut contents[16..], self.track_id);
BigEndian::write_u64(&mut contents[24..], self.duration);
BigEndian::write_i32(&mut contents[44..], 0); // volume
BigEndian::write_i32(&mut contents[46..], 0x00010000);
BigEndian::write_i32(&mut contents[62..], 0x00010000);
BigEndian::write_i32(&mut contents[78..], 0x40000000);
BigEndian::write_u32(&mut contents[84..], 1); // width
BigEndian::write_u32(&mut contents[88..], 2); // height
writer.put_slice(&contents);
Ok(())
}
}
|
