minf.go

package mp4

import "io"

// MinfBox -  Media Information Box (minf - mandatory)
//
// Contained in : Media Box (mdia)
//
type MinfBox struct {
	Vmhd     *VmhdBox
	Smhd     *SmhdBox
	Stbl     *StblBox
	Dinf     *DinfBox
	Hdlr     *HdlrBox
	Children []Box
}

// NewMinfBox - Generate a new empty minf box
func NewMinfBox() *MinfBox {
	return &MinfBox{}
}

// AddChild - Add a child box
func (m *MinfBox) AddChild(box Box) {

	switch box.Type() {
	case "vmhd":
		m.Vmhd = box.(*VmhdBox)
	case "smhd":
		m.Smhd = box.(*SmhdBox)
	case "dinf":
		m.Dinf = box.(*DinfBox)
	case "stbl":
		m.Stbl = box.(*StblBox)
	}
	m.Children = append(m.Children, box)
}

// DecodeMinf - box-specific decode
func DecodeMinf(hdr *boxHeader, startPos uint64, r io.Reader) (Box, error) {
	l, err := DecodeContainerChildren(hdr, startPos+8, startPos+hdr.size, r)
	if err != nil {
		return nil, err
	}
	m := NewMinfBox()
	for _, b := range l {
		m.AddChild(b)
	}
	return m, nil
}

// Type - box type
func (m *MinfBox) Type() string {
	return "minf"
}

// Size - calculated size of box
func (m *MinfBox) Size() uint64 {
	return containerSize(m.Children)
}

// GetChildren - list of child boxes
func (m *MinfBox) GetChildren() []Box {
	return m.Children
}

// Encode - write minf container to w
func (m *MinfBox) Encode(w io.Writer) error {
	return EncodeContainer(m, w)
}

func (m *MinfBox) Info(w io.Writer, specificBoxLevels, indent, indentStep string) error {
	return ContainerInfo(m, w, specificBoxLevels, indent, indentStep)
}