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libraries/audio-tools/examples/examples-audiokit/streams-audiokit-ram-ptichshift-audiokit/streams-audiokit-ram-ptichshift-audiokit.ino

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+/**
+ * @file streams-audiokit-sd-audiokit.ino
+ * @author Phil Schatzmann
+ * @brief We record the input from the microphone to SPI RAM and constantly repeat to play the file
+ * The input is triggered by pressing key 1. Recording stops when key 1 is released!
+ * The output pitch is shifted by 1 octave!
+ * @version 0.1
+ * @date 2022-11-21
+ * 
+ * @copyright Copyright (c) 2022
+ * 
+ */
+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/AudioBoardStream.h"
+#include "AudioTools/AudioLibs/MemoryManager.h"
+
+AudioInfo info(16000, 1, 16);
+MemoryManager memory(500); // Activate SPI RAM for objects > 500 bytes
+AudioBoardStream kit(AudioKitEs8388V1);
+//use one of VariableSpeedRingBufferSimple, VariableSpeedRingBuffer, VariableSpeedRingBuffer180 
+PitchShiftOutput<int16_t, VariableSpeedRingBuffer<int16_t>> pitch_shift(kit);
+DynamicMemoryStream recording(false); // Audio stored on heap, non repeating
+StreamCopy copier; // copies data
+ 
+
+void record_start(bool pinStatus, int pin, void* ref){
+  Serial.println("Recording...");
+  recording.begin();
+  copier.begin(recording, kit);  
+}
+
+void record_end(bool pinStatus, int pin, void* ref){
+  Serial.println("Playing...");
+
+  // Remove popping noise, from button: we delete 6 segments at the beginning and end 
+  // and on the resulting audio we slowly raise the volume on the first segment
+  // end decrease it on the last segment
+  recording.postProcessSmoothTransition<int16_t>(info.channels, 0.01, 6);
+
+  // output with pitch shifting
+  copier.begin(pitch_shift, recording);  // start playback
+}
+
+void setup(){
+  Serial.begin(115200);
+  while(!Serial); // wait for serial to be ready
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);  
+
+  // setup input and output
+  auto cfg = kit.defaultConfig(RXTX_MODE);
+  cfg.sd_active = true;
+  cfg.copyFrom(info);
+  cfg.input_device = ADC_INPUT_LINE2;
+  kit.begin(cfg);
+  kit.setVolume(1.0);
+
+  // setup pitch shift
+  auto cfg_pc = pitch_shift.defaultConfig();
+  cfg_pc.pitch_shift = 2; // one octave up
+  cfg_pc.buffer_size = 1000;
+  cfg_pc.copyFrom(info);
+  pitch_shift.begin(cfg_pc);
+
+  // record when key 1 is pressed
+  kit.audioActions().add(kit.getKey(1), record_start, record_end);
+  Serial.println("Press Key 1 to record");
+}
+
+void loop(){
+  // record or play recording
+  copier.copy();  
+
+  // Process keys
+  kit.processActions();
+}