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libraries/audio-tools/examples/examples-stream/streams-sd_wav4-i2s/streams-sd_wav4-i2s.ino

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+/**
+ * @file streams-sd_wav4-i2s.ino
+ * @author Phil Schatzmann
+ * @brief decode WAV file with 4 channels and output it on 2 I2S ports
+ * @version 0.1
+ * @date 2021-96-25
+ *
+ * @copyright Copyright (c) 2021
+ */
+
+#include <SD.h>
+#include <SPI.h>
+#include "AudioTools.h"
+#include "AudioTools/AudioCodecs/CodecMP3Helix.h"
+
+const int chipSelect = 10;
+AudioInfo info(44100, 2, 16);
+AudioInfo info4(44100, 4, 16);
+I2SStream i2s_1;  // final output port 0
+I2SStream i2s_2;  // final output port 1
+ChannelsSelectOutput out;
+WAVDecoder wav;
+EncodedAudioOutput decoder(&out, &wav);  // Decoding stream
+StreamCopy copier;
+File audioFile;
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+  // setup file
+  SD.begin(chipSelect);
+  audioFile = SD.open("/Music/ch4.wav");
+
+  // setup i2s
+  auto config1 = i2s_1.defaultConfig(TX_MODE);
+  config1.copyFrom(info);
+  // config1.port_no = 0;  // 0 is default port  
+  i2s_1.begin(config1);
+  
+  auto config2 = i2s_2.defaultConfig(TX_MODE);
+  config2.copyFrom(info);
+  // use separate pins
+  config2.pin_ws = 4;
+  config2.pin_bck = 5;
+  config2.pin_data = 6;
+  // use port 1
+  config2.port_no = 1;
+  i2s_2.begin(config2);
+
+  // split channels to different i2s ports
+  out.addOutput(i2s_1, 0, 1);
+  out.addOutput(i2s_2, 2, 3);
+
+  // 4 channels
+  out.begin(info4);
+
+  // setup decoder
+  decoder.begin();
+
+  // begin copy
+  copier.begin(decoder, audioFile);
+}
+
+void loop() {
+  if (!copier.copy()) {
+    stop();
+  }
+}