mirror of
https://github.com/langhuihui/monibuca.git
synced 2025-12-24 13:48:04 +08:00
404 lines
8.6 KiB
Go
404 lines
8.6 KiB
Go
package box
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import (
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"encoding/binary"
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"io"
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"net"
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"reflect"
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"unsafe"
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)
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type (
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BoxType [4]byte
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BoxHeader interface {
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Type() BoxType
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HeaderSize() uint32
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Size() uint64
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Header() BoxHeader
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HeaderWriteTo(w io.Writer) (n int64, err error)
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}
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IBox interface {
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BoxHeader
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io.WriterTo
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Unmarshal(buf []byte) (IBox, error)
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}
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// 基础Box结构，实现通用字段
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BaseBox struct {
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typ BoxType
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size uint32
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}
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DataBox struct {
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BaseBox
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Data []byte
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}
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BigBox struct {
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BaseBox
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size uint64
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}
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FullBox struct {
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BaseBox
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Version uint8
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Flags [3]byte
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}
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ContainerBox struct {
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BaseBox
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Children []IBox
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}
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)
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func CreateBaseBox(typ BoxType, size uint64) IBox {
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if size > 0xFFFFFFFF {
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return &BigBox{
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BaseBox: BaseBox{
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typ: typ,
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size: 1,
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},
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size: size + 8,
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}
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}
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return &BaseBox{
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typ: typ,
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size: uint32(size),
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}
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}
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func CreateDataBox(typ BoxType, data []byte) *DataBox {
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return &DataBox{
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BaseBox: BaseBox{
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typ: typ,
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size: uint32(len(data)) + BasicBoxLen,
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},
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Data: data,
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}
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}
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func CreateContainerBox(typ BoxType, children ...IBox) *ContainerBox {
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size := uint32(BasicBoxLen)
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realChildren := make([]IBox, 0, len(children))
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for _, child := range children {
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if reflect.ValueOf(child).IsNil() {
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continue
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}
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size += uint32(child.Size())
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realChildren = append(realChildren, child)
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}
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return &ContainerBox{
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BaseBox: BaseBox{
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typ: typ,
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size: size,
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},
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Children: realChildren,
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}
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}
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func (b *BigBox) HeaderSize() uint32 { return BasicBoxLen + 8 }
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func (b *BaseBox) Header() BoxHeader { return b }
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func (b *BaseBox) HeaderSize() uint32 { return BasicBoxLen }
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func (b *BaseBox) Size() uint64 { return uint64(b.size) }
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func (b *BigBox) Size() uint64 { return uint64(b.size) }
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func (b *BaseBox) Type() BoxType { return b.typ }
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func (b *BaseBox) HeaderWriteTo(w io.Writer) (n int64, err error) {
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var tmp [4]byte
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binary.BigEndian.PutUint32(tmp[:], b.size)
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buffers := net.Buffers{tmp[:], b.typ[:]}
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return buffers.WriteTo(w)
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}
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func (b *BaseBox) WriteTo(w io.Writer) (n int64, err error) {
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return
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}
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func (b *ContainerBox) WriteTo(w io.Writer) (n int64, err error) {
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return WriteTo(w, b.Children...)
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}
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func (b *DataBox) WriteTo(w io.Writer) (n int64, err error) {
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_, err = w.Write(b.Data)
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return int64(len(b.Data)), err
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}
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func (b *BaseBox) Unmarshal(buf []byte) (IBox, error) {
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return b, nil
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}
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func (b *DataBox) Unmarshal(buf []byte) (IBox, error) {
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b.Data = buf
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return b, nil
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}
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func (b *FullBox) HeaderWriteTo(w io.Writer) (n int64, err error) {
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var tmp [4]byte
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binary.BigEndian.PutUint32(tmp[:], b.size)
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buffers := net.Buffers{tmp[:], b.typ[:], []byte{b.Version}, b.Flags[:]}
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return buffers.WriteTo(w)
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}
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func (b *BigBox) HeaderWriteTo(w io.Writer) (n int64, err error) {
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n, err = b.BaseBox.HeaderWriteTo(w)
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if err != nil {
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return
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}
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var tmp [8]byte
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binary.BigEndian.PutUint64(tmp[:], b.size)
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_, err = w.Write(tmp[:])
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return n + 8, err
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}
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func (b *BigBox) Header() BoxHeader { return b }
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func (b *FullBox) Header() BoxHeader { return b }
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func (b *FullBox) HeaderSize() uint32 { return FullBoxLen }
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func WriteTo(w io.Writer, box ...IBox) (n int64, err error) {
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var n1, n2 int64
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for _, b := range box {
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if reflect.ValueOf(b).IsNil() {
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continue
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}
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n1, err = b.HeaderWriteTo(w)
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if err != nil {
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return
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}
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n2, err = b.WriteTo(w)
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if err != nil {
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return
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}
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if n1+n2 != int64(b.Size()) {
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// panic(fmt.Sprintf("write to %s size error, %d != %d", b.Type(), n1+n2, b.Size()))
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}
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n += n1 + n2
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}
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return
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}
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func ReadFrom(r io.Reader) (box IBox, err error) {
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var tmp [8]byte
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if _, err = io.ReadFull(r, tmp[:]); err != nil {
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return
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}
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var baseBox BaseBox
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baseBox.size = binary.BigEndian.Uint32(tmp[:4])
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baseBox.typ = BoxType(tmp[4:])
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t, exists := registry[baseBox.typ.Uint32I()]
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if !exists {
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io.CopyN(io.Discard, r, int64(baseBox.size-BasicBoxLen))
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return &baseBox, nil
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}
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b := reflect.New(t.Elem()).Interface().(IBox)
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var payload []byte
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if baseBox.size == 1 {
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if _, err = io.ReadFull(r, tmp[:]); err != nil {
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return
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}
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payload = make([]byte, binary.BigEndian.Uint64(tmp[:])-BasicBoxLen-8)
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} else {
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payload = make([]byte, baseBox.size-BasicBoxLen)
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}
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_, err = io.ReadFull(r, payload)
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if err != nil {
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return nil, err
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}
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boxHeader := b.Header()
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switch header := boxHeader.(type) {
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case *BaseBox:
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*header = baseBox
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box, err = b.Unmarshal(payload)
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case *FullBox:
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header.BaseBox = baseBox
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header.Version = payload[0]
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header.Flags = [3]byte(payload[1:4])
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box, err = b.Unmarshal(payload[4:])
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}
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if err == io.EOF {
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return box, nil
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}
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return
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}
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func (b BoxType) String() string {
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return string(b[:])
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}
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func (b BoxType) Uint32() uint32 {
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return binary.BigEndian.Uint32(b[:])
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}
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func (b BoxType) Uint32I() uint32 {
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return *(*uint32)(unsafe.Pointer(&b[0]))
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}
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var registry = map[uint32]reflect.Type{}
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// RegisterBox 注册box类型
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func RegisterBox[T any](typ ...BoxType) {
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var b T
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bt := reflect.TypeOf(b)
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for _, t := range typ {
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registry[t.Uint32I()] = bt
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}
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}
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const (
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BasicBoxLen = 8 // size(4) + type(4)
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FullBoxLen = 12 // BasicBoxLen + version(1) + flags(3)
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)
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func f(s string) BoxType {
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return BoxType([]byte(s))
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}
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var (
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TypeFTYP = f("ftyp")
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TypeSTYP = f("styp")
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TypeMOOV = f("moov")
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TypeMVHD = f("mvhd")
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TypeTRAK = f("trak")
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TypeTKHD = f("tkhd")
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TypeMDIA = f("mdia")
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TypeMDHD = f("mdhd")
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TypeHDLR = f("hdlr")
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TypeMINF = f("minf")
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TypeSTBL = f("stbl")
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TypeSTSD = f("stsd")
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TypeSTTS = f("stts")
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TypeSTSC = f("stsc")
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TypeSTSZ = f("stsz")
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TypeSTCO = f("stco")
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TypeMDAT = f("mdat")
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TypeFREE = f("free")
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TypeUUID = f("uuid")
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TypeVMHD = f("vmhd")
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TypeSMHD = f("smhd")
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TypeHMHD = f("hmhd")
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TypeNMHD = f("nmhd")
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TypeCTTS = f("ctts")
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TypeCO64 = f("co64")
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TypePSSH = f("pssh")
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TypeSTSS = f("stss")
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TypeENCV = f("encv")
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TypeSINF = f("sinf")
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TypeFRMA = f("frma")
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TypeSCHI = f("schi")
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TypeTENC = f("tenc")
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TypeAVC1 = f("avc1")
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TypeHVC1 = f("hvc1")
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TypeHEV1 = f("hev1")
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TypeENCA = f("enca")
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TypeMP4A = f("mp4a")
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TypeULAW = f("ulaw")
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TypeALAW = f("alaw")
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TypeDOPS = f("dOps")
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TypeOPUS = f("opus")
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TypeAVCC = f("avcC")
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TypeHVCC = f("hvcC")
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TypeESDS = f("esds")
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TypeEDTS = f("edts")
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TypeELST = f("elst")
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TypeMVEX = f("mvex")
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TypeMEHD = f("mehd")
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TypeMOOF = f("moof")
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TypeMFHD = f("mfhd")
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TypeTRAF = f("traf")
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TypeTFHD = f("tfhd")
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TypeTFDT = f("tfdt")
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TypeTRUN = f("trun")
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TypeSDTP = f("sdtp")
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TypeSENC = f("senc")
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TypeSAIZ = f("saiz")
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TypeSAIO = f("saio")
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TypeSGPD = f("sgpd")
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TypeWAVE = f("wave")
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TypeMSDH = f("msdh")
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TypeMSIX = f("msix")
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TypeISOM = f("isom")
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TypeISO2 = f("iso2")
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TypeISO3 = f("iso3")
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TypeISO4 = f("iso4")
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TypeISO5 = f("iso5")
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TypeISO6 = f("iso6")
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TypeMP41 = f("mp41")
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TypeMP42 = f("mp42")
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TypeDASH = f("dash")
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TypeMFRA = f("mfra")
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TypeMFRO = f("mfro")
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TypeTREX = f("trex")
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TypeTFRA = f("tfra")
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TypeSIDX = f("sidx")
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TypeDINF = f("dinf")
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TypeDREF = f("dref")
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TypeVIDE = f("vide")
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TypeSOUN = f("soun")
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TypeMETA = f("meta")
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TypeAUXV = f("auxv")
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TypeHINT = f("hint")
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TypeUDTA = f("udta")
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// Common metadata box types
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TypeTITL = f("©nam") // Title
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TypeART = f("©ART") // Artist/Author
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TypeALB = f("©alb") // Album
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TypeDAY = f("©day") // Date/Year
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TypeCMT = f("©cmt") // Comment/Description
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TypeGEN = f("©gen") // Genre
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TypeCPRT = f("cprt") // Copyright
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TypeENCO = f("©too") // Encoder/Tool
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TypeWRT = f("©wrt") // Writer/Composer
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TypePRD = f("©prd") // Producer
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TypePRF = f("©prf") // Performer
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TypeGRP = f("©grp") // Grouping
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TypeLYR = f("©lyr") // Lyrics
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TypeKEYW = f("keyw") // Keywords
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TypeLOCI = f("loci") // Location Information
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TypeRTNG = f("rtng") // Rating
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TypeMETA_CUST = f("----") // Custom metadata (iTunes-style)
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)
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// aligned(8) class Box (unsigned int(32) boxtype, optional unsigned int(8)[16] extended_type) {
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// unsigned int(32) size;
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// unsigned int(32) type = boxtype;
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// if (size==1) {
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// unsigned int(64) largesize;
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// } else if (size==0) {
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// // box extends to end of file
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// }
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// if (boxtype=='uuid') {
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// unsigned int(8)[16] usertype = extended_type;
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// }
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// }
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// aligned(8) class FullBox(unsigned int(32) boxtype, unsigned int(8) v, bit(24) f) extends Box(boxtype) {
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// unsigned int(8) version = v;
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// bit(24) flags = f;
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// }
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type TimeToSampleEntry struct {
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SampleCount uint32
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SampleDelta uint32
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}
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type CompositionTimeToSampleEntry struct {
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SampleCount uint32
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SampleOffset int32
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}
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type SampleToChunkEntry struct {
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FirstChunk uint32
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SamplesPerChunk uint32
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SampleDescriptionIndex uint32
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}
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func ConvertUnixTimeToISO14496(unixTime uint64) uint64 {
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return unixTime + 0x7C25B080
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}
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