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googlespeak.go
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googlespeak.go
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package googlespeak
import (
"errors"
"io"
"log"
"net/http"
"net/url"
"os"
"os/exec"
"os/user"
"strings"
"unicode/utf8"
)
var langs = []string{"af", "ar", "ca", "cs", "cy", "da", "de", "el", "en",
"es", "fi", "fr", "hi", "hr", "ht", "hu", "hy", "id", "is", "it",
"ja", "ko", "la", "lv", "mk", "nl", "no", "pl", "pt", "ro", "ru",
"sk", "sq", "sr", "sv", "sw", "ta", "tr", "vi", "zh"}
func Say(s string, args ...string) error {
lang := "en"
if len(args) > 0 {
lang = args[0]
}
if !isValidLang(lang) {
return errors.New("Invalid language code!")
}
log.Printf("Lang: %s, say: %s", lang, s)
sentenses, err := splitSentenses(s)
if err != nil {
log.Print(err)
return err
}
err = speak(sentenses, lang)
if err != nil {
log.Print(err)
return err
}
return nil
}
func isValidLang(s string) bool {
for _, l := range langs {
if l == s {
return true
}
}
log.Printf("Invalid language: %s", s)
return false
}
func splitSentenses(s string) ([]string, error) {
sentenses := strings.Split(s, ".")
var result []string
for _, sentense := range sentenses {
if utf8.RuneCountInString(sentense) > 100 {
tokens := strings.Split(sentense, ",")
for i, token := range tokens {
tokens[i] = strings.TrimSpace(token)
if utf8.RuneCountInString(tokens[i]) > 100 {
return nil, errors.New("Can't split text into short tokens.")
}
}
result = append(result, tokens...)
} else {
result = append(result, strings.TrimSpace(sentense))
}
}
return result, nil
}
func getAudio(s, lang string) (io.ReadCloser, error) {
resp, err := http.Get("http://translate.google.com/translate_tts" +
"?ie=UTF-8&tl=" + lang + "&q=" + url.QueryEscape(s))
if err != nil {
return nil, err
}
return resp.Body, nil
}
func play(audio io.Reader) error {
mplayer := exec.Command("mplayer", "-cache", "8092", "-")
mplayer.Stdin = audio
return mplayer.Run()
}
func getFromCache(s, lang string) (io.ReadCloser, error) {
cached, err := os.Open(getCacheDir() + "/" + lang + "/" + s + ".mp3")
return cached, err
}
func cacheAudio(stream io.Reader, s, lang string) (io.ReadCloser, error) {
langCacheDir := getCacheDir() + "/" + lang
dir, err := os.Open(langCacheDir)
if os.IsNotExist(err) {
_ = os.MkdirAll(langCacheDir, 0700)
}
defer dir.Close()
filename := s + ".mp3"
f, err := os.Open(langCacheDir + "/" + filename)
if os.IsNotExist(err) {
f, err = os.Create(langCacheDir + "/" + filename)
if err != nil {
return nil, err
}
_, err = io.Copy(f, stream)
return f, err
}
return f, err
}
func speak(sentences []string, lang string) error {
var streams []io.ReadCloser
for _, s := range sentences {
log.Printf("Get from cache %s/%s", lang, s)
audio, err := getFromCache(s, lang)
if err != nil {
log.Printf("Cache for %s/%s not found. Trying to get audio from Google", lang, s)
stream, err := getAudio(s, lang)
if err == nil {
log.Printf("Caching stream for %s/%s", lang, s)
audio, _ = cacheAudio(stream, s, lang)
}
}
defer audio.Close()
streams = append(streams, audio)
}
for _, audio := range streams {
err := play(audio)
if err != nil {
return err
}
}
return nil
}
func getCacheDir() string {
xdgCacheHome := os.Getenv("XDG_CACHE_HOME")
if xdgCacheHome == "" {
user, _ := user.Current()
home := user.HomeDir
xdgCacheHome = home + "/.cache/gspeak"
}
dir, err := os.Open(xdgCacheHome)
if os.IsNotExist(err) {
_ = os.MkdirAll(xdgCacheHome, 0700)
dir, err = os.Open(xdgCacheHome)
}
return dir.Name()
}