mirror of
https://github.com/superseriousbusiness/gotosocial.git
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109 lines
2.7 KiB
Go
109 lines
2.7 KiB
Go
package mp4
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import (
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"bytes"
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"fmt"
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"github.com/google/uuid"
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)
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/*************************** pssh ****************************/
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func BoxTypePssh() BoxType { return StrToBoxType("pssh") }
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func init() {
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AddBoxDef(&Pssh{}, 0, 1)
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}
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// Pssh is ISOBMFF pssh box type
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type Pssh struct {
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FullBox `mp4:"0,extend"`
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SystemID [16]byte `mp4:"1,size=8,uuid"`
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KIDCount uint32 `mp4:"2,size=32,nver=0"`
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KIDs []PsshKID `mp4:"3,nver=0,len=dynamic,size=128"`
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DataSize int32 `mp4:"4,size=32"`
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Data []byte `mp4:"5,size=8,len=dynamic"`
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}
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type PsshKID struct {
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KID [16]byte `mp4:"0,size=8,uuid"`
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}
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// GetFieldLength returns length of dynamic field
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func (pssh *Pssh) GetFieldLength(name string, ctx Context) uint {
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switch name {
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case "KIDs":
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return uint(pssh.KIDCount)
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case "Data":
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return uint(pssh.DataSize)
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}
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panic(fmt.Errorf("invalid name of dynamic-length field: boxType=pssh fieldName=%s", name))
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}
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// StringifyField returns field value as string
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func (pssh *Pssh) StringifyField(name string, indent string, depth int, ctx Context) (string, bool) {
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switch name {
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case "KIDs":
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buf := bytes.NewBuffer(nil)
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buf.WriteString("[")
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for i, e := range pssh.KIDs {
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if i != 0 {
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buf.WriteString(", ")
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}
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buf.WriteString(uuid.UUID(e.KID).String())
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}
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buf.WriteString("]")
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return buf.String(), true
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default:
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return "", false
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}
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}
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// GetType returns the BoxType
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func (*Pssh) GetType() BoxType {
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return BoxTypePssh()
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}
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/*************************** tenc ****************************/
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func BoxTypeTenc() BoxType { return StrToBoxType("tenc") }
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func init() {
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AddBoxDef(&Tenc{}, 0, 1)
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}
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// Tenc is ISOBMFF tenc box type
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type Tenc struct {
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FullBox `mp4:"0,extend"`
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Reserved uint8 `mp4:"1,size=8,dec"`
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DefaultCryptByteBlock uint8 `mp4:"2,size=4,dec"` // always 0 on version 0
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DefaultSkipByteBlock uint8 `mp4:"3,size=4,dec"` // always 0 on version 0
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DefaultIsProtected uint8 `mp4:"4,size=8,dec"`
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DefaultPerSampleIVSize uint8 `mp4:"5,size=8,dec"`
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DefaultKID [16]byte `mp4:"6,size=8,uuid"`
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DefaultConstantIVSize uint8 `mp4:"7,size=8,opt=dynamic,dec"`
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DefaultConstantIV []byte `mp4:"8,size=8,opt=dynamic,len=dynamic"`
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}
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func (tenc *Tenc) IsOptFieldEnabled(name string, ctx Context) bool {
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switch name {
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case "DefaultConstantIVSize", "DefaultConstantIV":
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return tenc.DefaultIsProtected == 1 && tenc.DefaultPerSampleIVSize == 0
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}
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return false
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}
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func (tenc *Tenc) GetFieldLength(name string, ctx Context) uint {
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switch name {
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case "DefaultConstantIV":
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return uint(tenc.DefaultConstantIVSize)
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}
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panic(fmt.Errorf("invalid name of dynamic-length field: boxType=tenc fieldName=%s", name))
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}
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// GetType returns the BoxType
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func (*Tenc) GetType() BoxType {
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return BoxTypeTenc()
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}
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