Code refactoring for xiaomi source

pkg/xiaomi/legacy/client.go

@@ -85,10 +85,7 @@ func xiaofangLogin(conn *tutk.Conn, password string) error {
 	}
 
 	_, data, err = conn.ReadCommand()
-	if err != nil {
-		return err
-	}
-	return nil
+	return err
 }
 
 type Client struct {
@@ -110,14 +107,8 @@ func (c *Client) ReadPacket() (hdr, payload []byte, err error) {
 		switch hdr[0] {
 		case tutk.CodecH264, tutk.CodecH265:
 			payload, err = DecodeVideo(payload, c.key)
-			if err != nil {
-				return
-			}
 		case tutk.CodecAAC:
 			payload, err = crypto.Decode(payload, c.key)
-			if err != nil {
-				return
-			}
 		}
 	}
 	return

pkg/xiaomi/legacy/producer.go

@@ -62,7 +62,7 @@ func probe(client *Client) ([]*core.Media, error) {
 	var vcodec, acodec *core.Codec
 
 	for {
-		// 0   5000
+		// 0   5000      codec
 		// 2   0000      codec params
 		// 4   01        active clients
 		// 5   34        unknown const
@@ -83,7 +83,6 @@ func probe(client *Client) ([]*core.Media, error) {
 				if codec == tutk.CodecH264 {
 					if h264.NALUType(avcc) == h264.NALUTypeSPS {
 						vcodec = h264.AVCCToCodec(avcc)
-						vcodec.FmtpLine = ""
 					}
 				} else {
 					if h265.NALUType(avcc) == h265.NALUTypeVPS {