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libraries/audio-tools/examples/examples-tts/streams-url_wav-i2s/README.md

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+
+We generate generate a WAV from some text with the help of [rhasspy](https://rhasspy.readthedocs.io/en/latest/) which is running e.g. on a Rasperry Pi. 
+and output the result via I2S.
+
+Further details can be fond in https://www.pschatzmann.ch/home/2021/06/23/text-to-speach-in-arduino-conclusions/

libraries/audio-tools/examples/examples-tts/streams-url_wav-i2s/streams-url_wav-i2s.ino

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+/**
+ * @file streams-url_wav-serial.ino
+ * @author Phil Schatzmann
+ * @brief decode WAV stream from rhasspy url and output it on I2S
+ * @version 0.1
+ * @date 2021-96-25
+ * 
+ * @copyright Copyright (c) 2021
+ 
+ */
+#include "AudioTools.h"
+#include "AudioTools/Communication/AudioHttp.h"
+
+// UrlStream -copy-> EncodedAudioStream -> I2S
+
+URLStream url("ssid","password");
+I2SStream i2s;                  // I2S stream 
+WAVDecoder decoder;             // decode wav to pcm and send it to I2S
+EncodedAudioStream out(&i2s, &decoder); // Decoder stream
+StreamCopy copier(out, url);    // copy in to out
+
+
+void setup(){
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);  
+
+  // setup i2s
+  auto config = i2s.defaultConfig(TX_MODE);
+  config.sample_rate = 16000; 
+  config.bits_per_sample = 32;
+  config.channels = 1;
+  i2s.begin(config);
+
+// rhasspy
+  url.begin("http://192.168.1.37:12101/api/text-to-speech?play=false","audio/wav", POST, "text/plain","Hallo, my name is Alice");
+}
+
+void loop(){
+  if (decoder) {
+    copier.copy();
+  } else {
+    stop();
+  }
+}