feat: GetContentProtection methods

CHANGELOG.md

@@ -7,7 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-- Nothing yet
+### Added
+
+- GetContentProtections methods to AdaptationSet and Representation
 
 ## [0.10.0] - 2023-05-26
 

mpd/mpd.go

@@ -286,6 +286,11 @@ func (a *AdaptationSetType) Clone() *AdaptationSetType {
 	return ac
 }
 
+// GetRepresentations returns the ContentProtections of the adaptation set.
+func (a *AdaptationSetType) GetContentProtections() []*ContentProtectionType {
+	return a.ContentProtections
+}
+
 // ContentComponentType is Content Component.
 type ContentComponentType struct {
 	XMLName         xml.Name               `xml:"ContentComponent"`
@@ -452,6 +457,14 @@ func (r *RepresentationType) GetMedia() (string, error) {
 	return media, nil
 }
 
+// GetContentProtections returns the representation's or its parent's content protections.
+func (r *RepresentationType) GetContentProtections() []*ContentProtectionType {
+	if len(r.ContentProtections) == 0 {
+		return r.parent.GetContentProtections()
+	}
+	return r.ContentProtections
+}
+
 // ContentProtectionType is Content Protection.
 type ContentProtectionType struct {
 	XMLName    xml.Name `xml:"ContentProtection"`