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127 lines
3.5 KiB
Go
127 lines
3.5 KiB
Go
package mp4
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import "fmt"
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/*************************** esds ****************************/
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// https://developer.apple.com/library/content/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html
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func BoxTypeEsds() BoxType { return StrToBoxType("esds") }
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func init() {
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AddBoxDef(&Esds{}, 0)
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}
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const (
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ESDescrTag = 0x03
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DecoderConfigDescrTag = 0x04
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DecSpecificInfoTag = 0x05
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SLConfigDescrTag = 0x06
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)
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// Esds is ES descripter box
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type Esds struct {
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FullBox `mp4:"0,extend"`
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Descriptors []Descriptor `mp4:"1,array"`
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}
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// GetType returns the BoxType
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func (*Esds) GetType() BoxType {
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return BoxTypeEsds()
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}
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type Descriptor struct {
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BaseCustomFieldObject
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Tag int8 `mp4:"0,size=8"` // must be 0x03
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Size uint32 `mp4:"1,varint"`
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ESDescriptor *ESDescriptor `mp4:"2,extend,opt=dynamic"`
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DecoderConfigDescriptor *DecoderConfigDescriptor `mp4:"3,extend,opt=dynamic"`
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Data []byte `mp4:"4,size=8,opt=dynamic,len=dynamic"`
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}
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// GetFieldLength returns length of dynamic field
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func (ds *Descriptor) GetFieldLength(name string, ctx Context) uint {
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switch name {
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case "Data":
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return uint(ds.Size)
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}
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panic(fmt.Errorf("invalid name of dynamic-length field: boxType=esds fieldName=%s", name))
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}
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func (ds *Descriptor) IsOptFieldEnabled(name string, ctx Context) bool {
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switch ds.Tag {
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case ESDescrTag:
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return name == "ESDescriptor"
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case DecoderConfigDescrTag:
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return name == "DecoderConfigDescriptor"
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default:
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return name == "Data"
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}
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}
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// StringifyField returns field value as string
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func (ds *Descriptor) StringifyField(name string, indent string, depth int, ctx Context) (string, bool) {
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switch name {
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case "Tag":
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switch ds.Tag {
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case ESDescrTag:
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return "ESDescr", true
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case DecoderConfigDescrTag:
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return "DecoderConfigDescr", true
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case DecSpecificInfoTag:
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return "DecSpecificInfo", true
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case SLConfigDescrTag:
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return "SLConfigDescr", true
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default:
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return "", false
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}
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default:
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return "", false
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}
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}
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type ESDescriptor struct {
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BaseCustomFieldObject
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ESID uint16 `mp4:"0,size=16"`
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StreamDependenceFlag bool `mp4:"1,size=1"`
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UrlFlag bool `mp4:"2,size=1"`
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OcrStreamFlag bool `mp4:"3,size=1"`
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StreamPriority int8 `mp4:"4,size=5"`
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DependsOnESID uint16 `mp4:"5,size=16,opt=dynamic"`
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URLLength uint8 `mp4:"6,size=8,opt=dynamic"`
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URLString []byte `mp4:"7,size=8,len=dynamic,opt=dynamic,string"`
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OCRESID uint16 `mp4:"8,size=16,opt=dynamic"`
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}
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func (esds *ESDescriptor) GetFieldLength(name string, ctx Context) uint {
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switch name {
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case "URLString":
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return uint(esds.URLLength)
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}
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panic(fmt.Errorf("invalid name of dynamic-length field: boxType=ESDescriptor fieldName=%s", name))
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}
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func (esds *ESDescriptor) IsOptFieldEnabled(name string, ctx Context) bool {
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switch name {
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case "DependsOnESID":
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return esds.StreamDependenceFlag
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case "URLLength", "URLString":
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return esds.UrlFlag
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case "OCRESID":
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return esds.OcrStreamFlag
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default:
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return false
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}
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}
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type DecoderConfigDescriptor struct {
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BaseCustomFieldObject
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ObjectTypeIndication byte `mp4:"0,size=8"`
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StreamType int8 `mp4:"1,size=6"`
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UpStream bool `mp4:"2,size=1"`
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Reserved bool `mp4:"3,size=1"`
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BufferSizeDB uint32 `mp4:"4,size=24"`
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MaxBitrate uint32 `mp4:"5,size=32"`
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AvgBitrate uint32 `mp4:"6,size=32"`
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}
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