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mfhd.go
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mfhd.go
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package mp4
import (
"io"
"io/ioutil"
)
// MfhdBox - Media Fragment Header Box (mfhd)
//
// Contained in : Movie Fragment box (moof))
type MfhdBox struct {
Version byte
Flags uint32
SequenceNumber uint32
}
// DecodeMfhd - box-specific decode
func DecodeMfhd(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)
flags := versionAndFlags & flagsMask
sequenceNumber := s.ReadUint32()
return &MfhdBox{
Version: version,
Flags: flags,
SequenceNumber: sequenceNumber,
}, nil
}
// CreateMfhd - create an MfhdBox
func CreateMfhd(sequenceNumber uint32) *MfhdBox {
return &MfhdBox{
Version: 0,
Flags: 0,
SequenceNumber: sequenceNumber,
}
}
// Type - box type
func (m *MfhdBox) Type() string {
return "mfhd"
}
// Size - calculated size of box
func (m *MfhdBox) Size() uint64 {
return boxHeaderSize + 8
}
// Encode - write box to w
func (m *MfhdBox) Encode(w io.Writer) error {
err := EncodeHeader(m, w)
if err != nil {
return err
}
buf := makebuf(m)
sw := NewSliceWriter(buf)
versionAndFlags := (uint32(m.Version) << 24) + m.Flags
sw.WriteUint32(versionAndFlags)
sw.WriteUint32(m.SequenceNumber)
_, err = w.Write(buf)
return err
}
func (m *MfhdBox) Info(w io.Writer, specificBoxLevels, indent, indentStep string) error {
bd := newInfoDumper(w, indent, m, int(m.Version), m.Flags)
bd.write(" - sequenceNumber: %d", m.SequenceNumber)
return bd.err
}