Merge pull request #34 from yteraoka/selectable-tts-language

Make Text-to-Speech language selectable

Author: vishen

README.md

@@ -244,3 +244,10 @@ Text-to-speech api needs to be enabled https://console.cloud.google.com/flows/en
 ```
 $ go-chromecast tts <message_to_say> --google-service-account=/path/to/service/account.json
 ```
+
+For non en-US languages
+
+```
+$ go-chromecast tts <message_to_say> --google-service-account=/path/to/service/account.json \
+  --language-code ja-JP
+```

cmd/tts.go

@@ -40,6 +40,8 @@ var ttsCmd = &cobra.Command{
 			return
 		}
 
+		languageCode, _ := cmd.Flags().GetString("language-code")
+
 		b, err := ioutil.ReadFile(googleServiceAccount)
 		if err != nil {
 			fmt.Printf("unable to open google service account file: %v\n", err)
@@ -52,7 +54,7 @@ var ttsCmd = &cobra.Command{
 			return
 		}
 
-		data, err := tts.Create(args[0], b)
+		data, err := tts.Create(args[0], b, languageCode)
 		if err != nil {
 			fmt.Printf("%v\n", err)
 			return
@@ -86,4 +88,5 @@ var ttsCmd = &cobra.Command{
 func init() {
 	rootCmd.AddCommand(ttsCmd)
 	ttsCmd.Flags().String("google-service-account", "", "google service account JSON file")
+	ttsCmd.Flags().String("language-code", "en-US", "text-to-speech Language Code (de-DE, ja-JP,...)")
 }

tts/tts.go

@@ -15,7 +15,7 @@ const (
 	timeout = time.Second * 10
 )
 
-func Create(sentence string, serviceAccountKey []byte) ([]byte, error) {
+func Create(sentence string, serviceAccountKey []byte, languageCode string) ([]byte, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), timeout)
 	defer cancel()
 
@@ -29,7 +29,7 @@ func Create(sentence string, serviceAccountKey []byte) ([]byte, error) {
 			InputSource: &texttospeechpb.SynthesisInput_Text{Text: sentence},
 		},
 		Voice: &texttospeechpb.VoiceSelectionParams{
-			LanguageCode: "en-US",
+			LanguageCode: languageCode,
 			SsmlGender:   texttospeechpb.SsmlVoiceGender_NEUTRAL,
 		},
 		AudioConfig: &texttospeechpb.AudioConfig{