Some STK examples

Author: pschatzmann

examples/examples-stk/streams-stk-audiokit/streams-stk-audiokit.ino

@@ -0,0 +1,66 @@
+/**
+ * @file streams-stk-audioout.ino
+ * @brief Plays random notes on instrument. For available instruments
+ * see https://pschatzmann.github.io/Arduino-STK/html/classstk_1_1Instrmnt.html
+ * I used an AudioKitStream to test the output, but you can replace it with any other output class (e.g. I2SStream)
+ * @author Phil Schatzmann
+ * @copyright Copyright (c) 2021
+ */
+#include "AudioTools.h"
+#include "AudioLibs/AudioSTK.h"
+#include "AudioLibs/AudioKit.h"
+
+Sitar instrument(440);
+STKStream in(instrument);
+AudioKitStream out;
+StreamCopy copier(out, in);
+MusicalNotes notes;
+
+float note_amplitude = 0.5;
+static uint16_t notes_array[] = { // frequencies aleatoric C-scale
+    N_C3, N_D3, N_E3, N_F3, N_G3, N_A3, N_B3,
+    N_C4, N_D4, N_E4, N_F4, N_G4, N_A4, N_B4,
+    N_C5, N_D5, N_E5, N_F5, N_G5, N_A5, N_B5
+};
+
+void play() {
+  static bool active=true;
+  static float freq;
+  static uint64_t timeout;
+
+  if (millis()>timeout){
+    if (active){
+      // play note for 800 ms
+      freq = notes_array[random(sizeof(notes_array)/sizeof(uint16_t))];
+      instrument.noteOn(freq, note_amplitude);
+      timeout = millis()+800;
+      active = false;
+    } else {
+      // silence for 100 ms
+      instrument.noteOff(note_amplitude);
+      timeout = millis()+100;
+      active = true;
+    }
+  }
+}
+
+void setup() {
+  Serial.begin(115200);
+  AudioLogger::instance().begin(Serial,AudioLogger::Warning);
+
+  // setup input
+  auto icfg = in.defaultConfig();
+  in.begin(icfg);
+
+  // setup output
+  auto ocfg = out.defaultConfig(TX_MODE);
+  ocfg.copyFrom(icfg);
+  ocfg.sd_active = false;
+  out.begin(ocfg);
+
+}
+
+void loop() {
+  play();
+  copier.copy();
+}

examples/sandbox/streams-stk-analog/streams-stk-analog.ino renamed to examples/examples-stk/streams-stk_generator-audiokit/streams-stk_generator-audiokit.ino

@@ -6,25 +6,21 @@
  * @copyright GPLv3
  */
 
-// Add this in your sketch or change the setting in AudioConfig.h
-#define USE_STK
-
 #include "AudioTools.h"
-#include "Clarinet.h"
-
-
+#include "AudioLibs/AudioKit.h"
+#include "AudioLibs/AudioSTK.h"
 
-stk::Clarinet clarinet(440); // the stk clarinet instrument
+Clarinet clarinet(440); // the stk clarinet instrument
 STKGenerator<int16_t> generator(clarinet);    // subclass of SoundGenerator
 GeneratedSoundStream<int16_t> in(generator);  // Stream generated from sine wave
-AnalogAudioStream out; // Output stream
+AudioKitStream out;
 StreamCopy copier(out, in); // copy stkStream to a2dpStream
 MusicalNotes notes; // notes with frequencies
 
 // Arduino Setup
 void setup(void) {
     Serial.begin(115200);
-    AudioLogger::instance().begin(Serial, AudioLogger::Info);
+    AudioLogger::instance().begin(Serial, AudioLogger::Warning);
 
     // start Output
     Serial.println("starting Analog Output...");

examples/examples-stk/streams-synthstk-audiokit/README.md renamed to examples/examples-stk/streams-stk_synth-audiokit/README.md

@@ -3,6 +3,8 @@
 We can use the STK framework to implement a Synthesizer which receives Midi Messages and translates them 
 into sound. Here we use a Clarinet...
 
+We demo how to use the Stream output classes provided by STK.
+
 For [further info see my blog](https://www.pschatzmann.ch/home/2021/12/21/ai-thinker-audiokit-a-simply-synthesizer-with-stk/)
 
 ### Dependencies

examples/examples-stk/streams-synthstk-audiokit/streams-synthstk-audiokit.ino renamed to examples/examples-stk/streams-stk_synth-audiokit/streams-stk_synth-audiokit.ino

@@ -39,7 +39,7 @@ void setupActions(){
 }
 
 void setup() {
-  Serial.begin(9600);
+  Serial.begin(115200);
   AudioLogger::instance().begin(Serial,AudioLogger::Warning);
 
   voicer.addInstrument(&clarinet, group);

examples/examples-stream/streams-a2dp-serial/streams-a2dp-serial.ino

@@ -12,7 +12,6 @@
 #include "AudioLibs/AudioA2DP.h"
 
 
-
 A2DPStream in = A2DPStream::instance() ; // A2DP input - A2DPStream is a singleton!
 CsvStream<int16_t> out(Serial, 2); // ASCII stream as csv 
 StreamCopy copier(out, in); // copy in to out

src/AudioLibs/AudioSTK.h

@@ -84,22 +84,25 @@ class STKGenerator : public SoundGenerator<T> {
 
 /**
  * @brief STK Stream for Instrument or Voicer
- * 
- * @tparam T 
  */
-template <class T>
-class STKStream : public GeneratedSoundStream<T> {
+class STKStream : public GeneratedSoundStream<int16_t> {
     public:
         STKStream(Instrmnt &instrument){
             generator.setInput(instrument);
-            GeneratedSoundStream<T>::setInput(generator);
+            GeneratedSoundStream<int16_t>::setInput(generator);
         }
         STKStream(Voicer &voicer){
             generator.setInput(voicer);
-            GeneratedSoundStream<T>::setInput(generator);
+            GeneratedSoundStream<int16_t>::setInput(generator);
+        }
+        void setInput(Instrmnt &instrument){
+            generator.setInput(instrument);
+        }
+        void setInput(Voicer &voicer){
+            generator.setInput(voicer);
         }
     protected:
-        STKGenerator<T> generator;
+        STKGenerator<int16_t> generator;
 
 };