-
Notifications
You must be signed in to change notification settings - Fork 1
/
tfdt.go
97 lines (87 loc) · 2.19 KB
/
tfdt.go
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
package mp4
import (
"io"
"io/ioutil"
)
// TfdtBox - Track Fragment Decode Time (tfdt)
//
// Contained in : Track Fragment box (traf)
type TfdtBox struct {
Version byte
Flags uint32
BaseMediaDecodeTime uint64
}
// DecodeTfdt - box-specific decode
func DecodeTfdt(hdr *boxHeader, startPos uint64, r io.Reader) (Box, error) {
data, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
s := NewSliceReader(data)
versionAndFlags := s.ReadUint32()
version := byte(versionAndFlags >> 24)
var baseMediaDecodeTime uint64
if version == 0 {
baseMediaDecodeTime = uint64(s.ReadUint32())
} else {
baseMediaDecodeTime = s.ReadUint64()
}
b := &TfdtBox{
Version: version,
Flags: versionAndFlags & flagsMask,
BaseMediaDecodeTime: baseMediaDecodeTime,
}
return b, nil
}
// CreateTfdt - Create a new TfdtBox with baseMediaDecodeTime
func CreateTfdt(baseMediaDecodeTime uint64) *TfdtBox {
var version byte = 0
if baseMediaDecodeTime >= 4294967296 {
version = 1
}
return &TfdtBox{
Version: version,
Flags: 0,
BaseMediaDecodeTime: baseMediaDecodeTime,
}
}
// SetBaseMediaDecodeTime - Set time of TfdtBox
func (t *TfdtBox) SetBaseMediaDecodeTime(bTime uint64) {
if bTime >= 4294967296 {
t.Version = 1
} else {
t.Version = 0
}
t.BaseMediaDecodeTime = bTime
}
// Type - return box type
func (t *TfdtBox) Type() string {
return "tfdt"
}
// Size - return calculated size
func (t *TfdtBox) Size() uint64 {
return uint64(boxHeaderSize + 8 + 4*int(t.Version))
}
// Encode - write box to w
func (t *TfdtBox) Encode(w io.Writer) error {
err := EncodeHeader(t, w)
if err != nil {
return err
}
buf := makebuf(t)
sw := NewSliceWriter(buf)
versionAndFlags := (uint32(t.Version) << 24) + t.Flags
sw.WriteUint32(versionAndFlags)
if t.Version == 0 {
sw.WriteUint32(uint32(t.BaseMediaDecodeTime))
} else {
sw.WriteUint64(t.BaseMediaDecodeTime)
}
_, err = w.Write(buf)
return err
}
func (t *TfdtBox) Info(w io.Writer, specificBoxLevels, indent, indentStep string) (err error) {
bd := newInfoDumper(w, indent, t, int(t.Version), t.Flags)
bd.write(" - baseMediaDecodeTime: %d", t.BaseMediaDecodeTime)
return bd.err
}