Allow multiple custom tags with the same name

reader.go

@@ -52,7 +52,7 @@ func (p *MasterPlaylist) DecodeFrom(reader io.Reader, strict bool) error {
 func (p *MasterPlaylist) WithCustomDecoders(customDecoders []CustomDecoder) Playlist {
 	// Create the map if it doesn't already exist
 	if p.Custom == nil {
-		p.Custom = make(map[string]CustomTag)
+		p.Custom = make([]CustomTag, 0)
 	}
 
 	p.customDecoders = customDecoders
@@ -282,7 +282,7 @@ func decodeLineOfMasterPlaylist(p *MasterPlaylist, state *decodingState, line st
 					return err
 				}
 
-				p.Custom[t.TagName()] = t
+				p.Custom = append(p.Custom, t)
 			}
 		}
 	}

reader_test.go

@@ -669,14 +669,23 @@ func TestDecodeMasterPlaylistWithCustomTags(t *testing.T) {
 		} else {
 			// we have the same count, lets confirm its the right tags
 			for _, expectedTag := range testCase.expectedPlaylistTags {
-				if _, ok := pp.Custom[expectedTag]; !ok {
+				if !findCustomTag(pp.Custom, expectedTag) {
 					t.Errorf("Did not parse custom tag %s", expectedTag)
 				}
 			}
 		}
 	}
 }
 
+func findCustomTag(tags []CustomTag, targetName string) bool {
+	for _, t := range tags {
+		if t.TagName() == targetName {
+			return true
+		}
+	}
+	return false
+}
+
 func TestDecodeMediaPlaylistWithCustomTags(t *testing.T) {
 	cases := []struct {
 		src                  string

structure.go

@@ -152,7 +152,7 @@ type MasterPlaylist struct {
 	buf                 bytes.Buffer
 	ver                 uint8
 	independentSegments bool
-	Custom              map[string]CustomTag
+	Custom              []CustomTag
 	customDecoders      []CustomDecoder
 }
 

writer.go

@@ -276,10 +276,10 @@ func (p *MasterPlaylist) Encode() *bytes.Buffer {
 // SetCustomTag sets the provided tag on the master playlist for its TagName
 func (p *MasterPlaylist) SetCustomTag(tag CustomTag) {
 	if p.Custom == nil {
-		p.Custom = make(map[string]CustomTag)
+		p.Custom = make([]CustomTag, 0)
 	}
 
-	p.Custom[tag.TagName()] = tag
+	p.Custom = append(p.Custom, tag)
 }
 
 // Version returns the current playlist version number