fix: update voice example for proper DCA playback

Author: cactysman

_examples/voice/voice.go

@@ -86,9 +86,10 @@ func writeOpus(w io.Writer) {
 	ticker := time.NewTicker(time.Millisecond * 20)
 	defer ticker.Stop()
 
-	var lenBuf [4]byte
-	for range ticker.C {
-		_, err = io.ReadFull(file, lenBuf[:])
+	var frameLen int16
+	// Don't wait for the first tick, run immediately.
+	for ; true; <-ticker.C {
+		err = binary.Read(file, binary.LittleEndian, &frameLen)
 		if err != nil {
 			if err == io.EOF {
 				_ = file.Close()
@@ -98,14 +99,11 @@ func writeOpus(w io.Writer) {
 			return
 		}
 
-		// Read the integer
-		frameLen := int64(binary.LittleEndian.Uint32(lenBuf[:]))
-
 		// Copy the frame.
-		_, err = io.CopyN(w, file, frameLen)
+		_, err = io.CopyN(w, file, int64(frameLen))
 		if err != nil && err != io.EOF {
 			_ = file.Close()
 			return
 		}
 	}
-}
+}