change: remove ReplaceChild method of StsdBox

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - CreatePrftBox now takes flags parameter
 - PrftBox Info output
+- Removed ReplaceChild method of StsdBox
 
 ### Added
 

mp4/stsd.go

@@ -76,30 +76,6 @@ func (s *StsdBox) AddChild(box Box) {
 	s.SampleCount++
 }
 
-// ReplaceChild - Replace a child box with one of the same type
-func (s *StsdBox) ReplaceChild(box Box) {
-	switch box.(type) {
-	case *VisualSampleEntryBox:
-		for i, b := range s.Children {
-			switch b.(type) {
-			case *VisualSampleEntryBox:
-				s.Children[i] = box.(*VisualSampleEntryBox)
-				s.AvcX = box.(*VisualSampleEntryBox)
-			}
-		}
-	case *AudioSampleEntryBox:
-		for i, b := range s.Children {
-			switch b.(type) {
-			case *AudioSampleEntryBox:
-				s.Children[i] = box.(*AudioSampleEntryBox)
-				s.Mp4a = box.(*AudioSampleEntryBox)
-			}
-		}
-	default:
-		panic("Cannot handle box type")
-	}
-}
-
 // GetSampleDescription - get one of multiple descriptions
 func (s *StsdBox) GetSampleDescription(index int) (Box, error) {
 	if index >= len(s.Children) {

mp4/stsd_test.go

@@ -50,3 +50,21 @@ func TestStsd(t *testing.T) {
 		}
 	}
 }
+
+func TestStsdEncodeDecode(t *testing.T) {
+	stsd := &StsdBox{}
+	evte := &EvteBox{}
+	stsd.AddChild(evte)
+	boxDiffAfterEncodeAndDecode(t, stsd)
+	b, err := stsd.GetSampleDescription(0)
+	if err != nil {
+		t.Error(err)
+	}
+	if b != evte {
+		t.Errorf("Expected %v, got %v", evte, b)
+	}
+	b, err = stsd.GetSampleDescription(1)
+	if err == nil {
+		t.Errorf("Expected error, got %v", b)
+	}
+}