codec/h264/decode: added ThreeDAVCExtenstion type and NewThreeDAVCExtension function

codec/h264/decode/nalunit.go

@@ -13,18 +13,57 @@ type NalUnit struct {
 	SvcExtensionFlag             int
 	Avc3dExtensionFlag           int
 	SVCExtension                 *SVCExtension
-	HeaderBytes                  int
+	ThreeDAVCExtension           *ThreeDAVCExtension
-	NonIdrFlag                   int
-	ViewId                       int
-	AnchorPicFlag                int
-	InterViewFlag                int
-	ReservedOneBit               int
-	ViewIdx                      int
-	DepthFlag                    int
 	EmulationPreventionThreeByte byte
 	rbsp                         []byte
 }
 
+type ThreeDAVCExtension struct {
+	ViewIdx       int
+	DepthFlag     bool
+	NonIdrFlag    bool
+	TemporalID    int
+	AnchorPicFlag bool
+	InterViewFlag bool
+}
+
+func NewThreeDAVCExtension(br *bits.BitReader) (*ThreeDAVCExtension, error) {
+	e := &ThreeDAVCExtension{}
+	var err error
+
+	e.ViewIdx, err = br.ReadBitsInt(8)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not read ViewIdx")
+	}
+
+	e.DepthFlag, err = br.ReadBool()
+	if err != nil {
+		return nil, errors.Wrap(err, "could not read DepthFlag")
+	}
+
+	e.NonIdrFlag, err = br.ReadBool()
+	if err != nil {
+		return nil, errors.Wrap(err, "could not read NonIdrFlag")
+	}
+
+	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")
+	}
+
+	return e, nil
+}
+
 type SVCExtension struct {
 	IdrFlag              bool
 	PriorityId           int
@@ -95,17 +134,6 @@ func NewSVCExtension(br *bits.BitReader) (*SVCExtension, error) {
 	return e, nil
 }
 
-func NalUnitHeader3davcExtension(nalUnit *NalUnit, br *bits.BitReader) error {
-	return readFields(br, []field{
-		{&nalUnit.ViewIdx, "ViewIdx", 8},
-		{&nalUnit.DepthFlag, "DepthFlag", 1},
-		{&nalUnit.NonIdrFlag, "NonIdrFlag", 1},
-		{&nalUnit.TemporalId, "TemporalId", 3},
-		{&nalUnit.AnchorPicFlag, "AnchorPicFlag", 1},
-		{&nalUnit.InterViewFlag, "InterViewFlag", 1},
-	})
-}
-
 func NalUnitHeaderMvcExtension(nalUnit *NalUnit, br *bits.BitReader) error {
 	return readFields(br, []field{
 		{&nalUnit.NonIdrFlag, "NonIdrFlag", 1},