codec/h264/decode: added MVCExtension type and NewMVCExtension func

codec/h264/decode/nalunit.go

@@ -14,10 +14,63 @@ type NalUnit struct {
 	Avc3dExtensionFlag           int
 	SVCExtension                 *SVCExtension
 	ThreeDAVCExtension           *ThreeDAVCExtension
+	MVCExtension                 *MVCExtension
 	EmulationPreventionThreeByte byte
 	rbsp                         []byte
 }
 
+type MVCExtension struct {
+	NonIdrFlag     bool
+	PriorityID     int
+	ViewID         int
+	TemporalID     int
+	AnchorPicFlag  bool
+	InterViewFlag  bool
+	ReservedOneBit int
+}
+
+func NewMVCExtension(br *bits.BitReader) (*MVCExtension, error) {
+	e := &MVCExtension{}
+	var err error
+
+	e.NonIdrFlag, err = br.ReadBool()
+	if err != nil {
+		return nil, errors.Wrap(err, "could not read NonIdrFlag")
+	}
+
+	e.PriorityID, err = br.ReadBitsInt(6)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not read PriorityId")
+	}
+
+	e.ViewID, err = br.ReadBitsInt(10)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not read ViewId")
+	}
+
+	e.TemporalID, err = br.ReadBitsInt(3)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not read TemporalId")
+	}
+
+	e.AnchorPicFlag, err = br.ReadBool()
+	if err != nil {
+		return nil, errors.Wrap(err, "could not read AnchorPicFlag")
+	}
+
+	e.InterViewFlag, err = br.ReadBool()
+	if err != nil {
+		return nil, errors.Wrap(err, "could not read InterViewFlag")
+	}
+
+	e.ReservedOneBit, err = br.ReadBitsInt(1)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not read ReservedOneBit")
+	}
+
+	return e, nil
+}
+
 type ThreeDAVCExtension struct {
 	ViewIdx       int
 	DepthFlag     bool
@@ -134,18 +187,6 @@ func NewSVCExtension(br *bits.BitReader) (*SVCExtension, error) {
 	return e, nil
 }
 
-func NalUnitHeaderMvcExtension(nalUnit *NalUnit, br *bits.BitReader) error {
-	return readFields(br, []field{
-		{&nalUnit.NonIdrFlag, "NonIdrFlag", 1},
-		{&nalUnit.PriorityId, "PriorityId", 6},
-		{&nalUnit.ViewId, "ViewId", 10},
-		{&nalUnit.TemporalId, "TemporalId", 3},
-		{&nalUnit.AnchorPicFlag, "AnchorPicFlag", 1},
-		{&nalUnit.InterViewFlag, "InterViewFlag", 1},
-		{&nalUnit.ReservedOneBit, "ReservedOneBit", 1},
-	})
-}
-
 func (n *NalUnit) RBSP() []byte {
 	return n.rbsp
 }