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libraries/audio-tools/examples/examples-tts/streams-google-audiokit/streams-google-audiokit.ino

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+/**
+ * @file streams-google-audiokit.ino
+ * @author Phil Schatzmann
+ * @brief decode MP3 stream from url and output it on I2S on audiokit.
+ * We are using the free google translate service to generate the mp3
+ * @version 0.1
+ * @date 2021-96-25
+ * 
+ * @copyright Copyright (c) 2021
+ */
+
+// install https://github.com/pschatzmann/arduino-libhelix.git
+
+#include "AudioTools.h"
+#include "AudioTools/AudioCodecs/CodecMP3Helix.h"
+#include "AudioTools/AudioLibs/AudioBoardStream.h"
+#include "AudioTools/Communication/AudioHttp.h"
+
+
+URLStream url("ssid","password");  
+AudioBoardStream i2s(AudioKitEs8388V1); // final output of decoded stream
+EncodedAudioStream dec(&i2s, new MP3DecoderHelix()); // Decoding stream
+StreamCopy copier(dec, url); // copy url to decoder
+Str query("http://translate.google.com/translate_tts?ie=UTF-8&tl=%1&client=tw-ob&ttsspeed=%2&q=%3");
+
+const char* tts(const char* text, const char* lang="en", const char* speed="1"){
+  query.replace("%1",lang);
+  query.replace("%2",speed);
+
+  Str encoded(text);
+  encoded.urlEncode();
+  query.replace("%3", encoded.c_str());
+  return query.c_str();
+}
+
+void setup(){
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);  
+
+  // setup i2s
+  auto config = i2s.defaultConfig(TX_MODE);
+  i2s.begin(config);
+
+  // setup decoder
+  dec.begin();
+
+  // display url
+  const char* url_str = tts("this is an english text");
+  Serial.println(url_str);
+
+  // generate mp3 with the help of google translate
+  url.begin(url_str ,"audio/mp3");
+
+}
+
+void loop(){
+  copier.copy();
+}