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libraries/audio-tools/examples/examples-stream/streams-i2s-i2s-2/README.md

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+# I2S input and I2S Output with separate Ports
+
+We use 2 separate I2S Ports to input data from an I2S device and output the data to another I2S Device:
+
+| In   | ESP32 | Out  |
+|------|-------|------|
+| BCK  | G14   | -    |
+| WS   | G15   | -    |
+| DATA | G22   | -    |
+| -    | G18   | BCK  |
+| -    | G19   | WS   |
+| -    | G23   | DATA |
+| VIN  | VIN   | VIN  |
+| GND  | GND   | GND  |

libraries/audio-tools/examples/examples-stream/streams-i2s-i2s-2/streams-i2s-i2s-2.ino

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+/**
+ * @file streams-i2s-i2s-2.ino
+ * @brief Copy audio from I2S to I2S: We use 2 different i2s ports!
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
+#include "AudioTools.h"
+ 
+AudioInfo info(44100, 2, 16);
+I2SStream in;
+I2SStream out; 
+StreamCopy copier(out, in); // 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_in = in.defaultConfig(RX_MODE);
+  config_in.copyFrom(info); 
+  config_in.i2s_format = I2S_STD_FORMAT;
+  config_in.is_master = true;
+  config_in.port_no = 0;
+  config_in.pin_bck = 14;
+  config_in.pin_ws = 15;
+  config_in.pin_data = 22;
+  // config_in.fixed_mclk = sample_rate * 256
+  // config_in.pin_mck = 2
+  in.begin(config_in);
+
+  // start I2S out
+  auto config_out = out.defaultConfig(TX_MODE);
+  config_out.copyFrom(info); 
+  config_out.i2s_format = I2S_STD_FORMAT;
+  config_out.is_master = true;
+  config_out.port_no = 1;
+  config_out.pin_bck = 18;
+  config_out.pin_ws = 19;
+  config_out.pin_data = 23;
+  out.begin(config_out);
+
+  Serial.println("I2S started...");
+}
+
+// Arduino loop - copy sound to out 
+void loop() {
+  copier.copy();
+}