Fix short write in metadata injector.

app/streams/metadata_injector.go

@@ -39,22 +39,23 @@ func (mi *MetadataInjector) writeMetadata() (n int, err error) {
 
 func (mi *MetadataInjector) Write(data []byte) (n int, err error) {
 	for n < len(data) {
+		restLen := len(data) - n
 		toWrite := mi.MetadataInterval - mi.offset
+		if toWrite > restLen {
+			toWrite = restLen
+		}
 
 		if toWrite <= 0 {
-			_, cerr := mi.writeMetadata()
-			//n += cn
-			if cerr != nil {
-				err = cerr
+			_, err = mi.writeMetadata()
+			if err != nil {
 				return
 			}
 			mi.offset = 0
-			// toWrite = mi.MetadataInterval
 			continue
 		}
 
 		outBytes := make([]byte, toWrite)
-		copy(outBytes, data[mi.offset:mi.offset+toWrite])
+		copy(outBytes, data[n:n+toWrite])
 		cn, cerr := mi.Writer.Write(outBytes)
 		n += cn
 		mi.offset += cn

plugins/icecast/output/instance.go

@@ -73,11 +73,23 @@ func (instance *pluginInstance) Init() {
 		if sendMetadata {
 			mw = streams.NewMetadataInjector(w, metaInt)
 			nw = mw
+
+			metadataChan := channel.Metadata()
+			defer close(metadataChan)
+			go func() {
+				for metadata := range metadataChan {
+					metadataToWrite := streams.Metadata{}
+					if value, ok := metadata["StreamTitle"]; ok {
+						metadataToWrite["StreamTitle"] = value
+					}
+					mw.SetMetadata(metadataToWrite)
+				}
+			}()
 		}
 
 		_, err := io.Copy(nw, sr)
 		if err != nil {
-			log.Println(err)
+			log.Println("copying stream to output failed:", err)
 		}
 	})