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libraries/audio-tools/examples/examples-stream/streams-i2s-i2s/README.md

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+# I2S input and I2S Output with One Port
+
+We use the same I2S Port to input data from an I2S device and output data to another I2S Device. This means that the WS and BCK pins are shared:
+
+| In   | ESP32 | Out  |
+|------|-------|------|
+| WS   | G14   | WS   |
+| BCK  | G15   | BCK  |
+| DATA | G19   | -    |
+| -    | G18   | DATA |
+| VIN  | VIN   | VIN  |
+| GND  | GND   | GND  |

libraries/audio-tools/examples/examples-stream/streams-i2s-i2s/streams-i2s-i2s.ino

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+/**
+ * @file streams-i2s-i2s.ino
+ * @brief Copy audio from I2S to I2S  - I2S uses 1 i2s port
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
+#include "AudioTools.h"
+ 
+AudioInfo info(44100, 2, 16);
+I2SStream i2s;
+StreamCopy copier(i2s, i2s); // copies sound into i2s
+
+
+// Arduino Setup
+void setup(void) {  
+  // Open Serial 
+  Serial.begin(115200);
+  // change to Warning to improve the quality
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info); 
+
+  // start I2S in
+  Serial.println("starting I2S...");
+  auto config = i2s.defaultConfig(RXTX_MODE);
+  config.copyFrom(info); 
+  config.i2s_format = I2S_STD_FORMAT;
+  config.pin_ws = 14;
+  config.pin_bck = 15;
+  config.pin_data = 18;
+  config.pin_data_rx = 19;
+  //config.fixed_mclk = sample_rate * 256;
+  // config.pin_mck = 3; // must be 0,1 or 3 - only for ESP_IDF_VERSION_MAJOR >= 4
+  i2s.begin(config);
+
+  Serial.println("I2S started...");
+}
+
+// Arduino loop - copy sound to out 
+void loop() {
+  copier.copy();
+}