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package mp4
import (
"errors"
"fmt"
"reflect"
"strings"
)
var ErrBoxInfoNotFound = errors.New("box info not found")
// BoxType is mpeg box type
type BoxType [4]byte
func StrToBoxType(code string) BoxType {
if len(code) != 4 {
panic(fmt.Errorf("invalid box type id length: [%s]", code))
}
return BoxType{code[0], code[1], code[2], code[3]}
}
func (boxType BoxType) String() string {
if isPrintable(boxType[0]) && isPrintable(boxType[1]) && isPrintable(boxType[2]) && isPrintable(boxType[3]) {
s := string([]byte{boxType[0], boxType[1], boxType[2], boxType[3]})
s = strings.ReplaceAll(s, string([]byte{0xa9}), "(c)")
return s
}
return fmt.Sprintf("0x%02x%02x%02x%02x", boxType[0], boxType[1], boxType[2], boxType[3])
}
func isASCII(c byte) bool {
return c >= 0x20 && c <= 0x7e
}
func isPrintable(c byte) bool {
return isASCII(c) || c == 0xa9
}
func (lhs BoxType) MatchWith(rhs BoxType) bool {
if lhs == boxTypeAny || rhs == boxTypeAny {
return true
}
return lhs == rhs
}
var boxTypeAny = BoxType{0x00, 0x00, 0x00, 0x00}
func BoxTypeAny() BoxType {
return boxTypeAny
}
type boxDef struct {
dataType reflect.Type
versions []uint8
isTarget func(Context) bool
fields []*field
}
var boxMap = make(map[BoxType][]boxDef, 64)
func AddBoxDef(payload IBox, versions ...uint8) {
boxMap[payload.GetType()] = append(boxMap[payload.GetType()], boxDef{
dataType: reflect.TypeOf(payload).Elem(),
versions: versions,
fields: buildFields(payload),
})
}
func AddBoxDefEx(payload IBox, isTarget func(Context) bool, versions ...uint8) {
boxMap[payload.GetType()] = append(boxMap[payload.GetType()], boxDef{
dataType: reflect.TypeOf(payload).Elem(),
versions: versions,
isTarget: isTarget,
fields: buildFields(payload),
})
}
func AddAnyTypeBoxDef(payload IAnyType, boxType BoxType, versions ...uint8) {
boxMap[boxType] = append(boxMap[boxType], boxDef{
dataType: reflect.TypeOf(payload).Elem(),
versions: versions,
fields: buildFields(payload),
})
}
func AddAnyTypeBoxDefEx(payload IAnyType, boxType BoxType, isTarget func(Context) bool, versions ...uint8) {
boxMap[boxType] = append(boxMap[boxType], boxDef{
dataType: reflect.TypeOf(payload).Elem(),
versions: versions,
isTarget: isTarget,
fields: buildFields(payload),
})
}
func (boxType BoxType) getBoxDef(ctx Context) *boxDef {
boxDefs := boxMap[boxType]
for i := len(boxDefs) - 1; i >= 0; i-- {
boxDef := &boxDefs[i]
if boxDef.isTarget == nil || boxDef.isTarget(ctx) {
return boxDef
}
}
return nil
}
func (boxType BoxType) IsSupported(ctx Context) bool {
return boxType.getBoxDef(ctx) != nil
}
func (boxType BoxType) New(ctx Context) (IBox, error) {
boxDef := boxType.getBoxDef(ctx)
if boxDef == nil {
return nil, ErrBoxInfoNotFound
}
box, ok := reflect.New(boxDef.dataType).Interface().(IBox)
if !ok {
return nil, fmt.Errorf("box type not implements IBox interface: %s", boxType.String())
}
anyTypeBox, ok := box.(IAnyType)
if ok {
anyTypeBox.SetType(boxType)
}
return box, nil
}
func (boxType BoxType) GetSupportedVersions(ctx Context) ([]uint8, error) {
boxDef := boxType.getBoxDef(ctx)
if boxDef == nil {
return nil, ErrBoxInfoNotFound
}
return boxDef.versions, nil
}
func (boxType BoxType) IsSupportedVersion(ver uint8, ctx Context) bool {
boxDef := boxType.getBoxDef(ctx)
if boxDef == nil {
return false
}
if len(boxDef.versions) == 0 {
return true
}
for _, sver := range boxDef.versions {
if ver == sver {
return true
}
}
return false
}
|
