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libraries/audio-tools/examples/examples-audiokit/streams-generator_outputmixer-audiokit/streams-generator_outputmixer-audiokit.ino

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+/**
+ * @file streams-generator_outputmixer-audiokit.ino
+ * @brief Tesing output mixer
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/AudioBoardStream.h"
+
+AudioInfo info(44100, 2, 16);
+const int N = 5;
+SineWaveGenerator<int16_t> sineWave[N](32000);
+GeneratedSoundStream<int16_t> sound[N];
+AudioBoardStream out(AudioKitEs8388V1);
+OutputMixer<int16_t> mixer(out, N, DefaultAllocatorRAM);
+StreamCopy copier[N](DefaultAllocatorRAM);
+
+// Arduino Setup
+void setup(void) {
+  // Open Serial
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  for (int j = 0; j < N; j++) {
+    sineWave[j].begin(info, 440 * (j + 1));
+    sound[j].setInput(sineWave[j]);
+    sound[j].begin(info);
+    copier[j].begin(mixer, sound[j]);  
+  }
+
+  // start I2S
+  Serial.println("starting I2S...");
+  auto config = out.defaultConfig(TX_MODE);
+  config.copyFrom(info);
+  out.begin(config);
+
+  // setup Output mixer with default buffer size
+  mixer.begin();
+
+  Serial.println("started...");
+}
+
+// Arduino loop - copy sound to out
+void loop() {
+  // write each output
+  for (int j = 0; j < N; j++) {
+    copier[j].copy();
+  }
+
+  // We could flush to force the output but this is not necessary because we
+  // were already writing all streams
+  // mixer.flushMixer();
+}