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libraries/audio-tools/examples/examples-communication/http-client/streams-url_mp3_mad-i2s/README.md

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+# Streaming Radio Player
+
+We just play a streamed radio station which provides the audio as mp3 and output the result via I2S to an external DAC
+To decode the data we use the libmad library.
+
+An ESP32 was used to test this sketch.
+
+### External DAC:
+
+![DAC](https://pschatzmann.github.io/Resources/img/dac.jpeg)
+
+
+I am just using the default pins defined by the framework. However I could change them with the help of the config object. The mute pin can be defined in the constructor of the I2SStream - by not defining anything we use the default which is GPIO23
+DAC  |	ESP32
+-----|----------------
+VCC  |	5V
+GND  |	GND
+BCK  |	BCK (GPIO14)
+DIN  |	OUT (GPIO22)
+LCK  |	BCK (GPIO15)
+FMT  |	GND
+XMT  |	3V (or another GPIO PIN which is set to high)
+
+- DMP - De-emphasis control for 44.1kHz sampling rate(1): Off (Low) / On (High)
+- FLT - Filter select : Normal latency (Low) / Low latency (High)
+- SCL - System clock input (probably SCL on your board).
+- FMT - Audio format selection : I2S (Low) / Left justified (High)
+- XMT - Soft mute control(1): Soft mute (Low) / soft un-mute (High)
+
+### Dependencies
+
+- https://github.com/pschatzmann/arduino-libmad
+
+
+

libraries/audio-tools/examples/examples-communication/http-client/streams-url_mp3_mad-i2s/streams-url_mp3_mad-i2s.ino

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+/**
+ * @file streams-url_mp3-i2s.ino
+ * @author Phil Schatzmann
+ * @brief decode MP3 stream from url and output it on I2S
+ * @version 0.1
+ * @date 2021-96-25
+ * 
+ * @copyright Copyright (c) 2021
+ */
+
+// install https://github.com/pschatzmann/arduino-libmad.git
+
+#include "AudioTools.h"
+#include "AudioTools/AudioCodecs/CodecMP3MAD.h"
+#include "AudioTools/Communication/AudioHttp.h"
+
+
+URLStream url("ssid","password");
+I2SStream i2s; // final output of decoded stream
+EncodedAudioStream dec(&i2s, new MP3DecoderMAD()); // Decoding stream
+StreamCopy copier(dec, url); // copy url to decoder
+
+
+void setup(){
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);  
+
+  // setup i2s
+  auto config = i2s.defaultConfig(TX_MODE);
+  // you could define e.g your pins and change other settings
+  //config.pin_ws = 10;
+  //config.pin_bck = 11;
+  //config.pin_data = 12;
+  //config.mode = I2S_STD_FORMAT;
+  i2s.begin(config);
+
+  // setup I2S based on sampling rate provided by decoder
+  dec.begin();
+
+// mp3 radio
+  url.begin("http://stream.srg-ssr.ch/m/rsj/mp3_128","audio/mp3");
+
+}
+
+void loop(){
+  copier.copy();
+}