CopyAll

Author: pschatzmann

examples/examples-stk/streams-synthstk-audiokit/README.md

@@ -0,0 +1,13 @@
+# Implementing a Synthesizer using the STK Framwork
+
+We can use the STK framework to implement a Synthesizer which receives Midi Messages and translates them 
+into sound. Here we use a Clarinet...
+
+For [further info see my blog](https://www.pschatzmann.ch/home/2021/12/21/ai-thinker-audiokit-a-simply-synthesizer-with-stk/)
+
+### Dependencies
+
+- https://github.com/pschatzmann/arduino-audio-tools
+- https://github.com/pschatzmann/arduino-audiokit
+- https://github.com/pschatzmann/arduino-midi
+- https://github.com/pschatzmann/Arduino-STK

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

@@ -0,0 +1,65 @@
+/**
+ * @file streams-synthstk-audiokit.ino
+ * @brief see https://www.pschatzmann.ch/home/2021/12/17/ai-thinker-audiokit-a-simple-synthesizer-with-stk/
+ * @author Phil Schatzmann
+ * @copyright Copyright (c) 2021
+ */
+#include "AudioTools.h"
+#include "AudioLibs/AudioKit.h"
+#include "StkAll.h"
+
+AudioKitStream kit;
+Clarinet clarinet(440);
+Voicer voicer;
+ArdStreamOut output(&kit);
+float noteAmplitude = 128;
+int group = 0;
+
+void actionKeyOn(bool active, int pin, void* ptr){
+  int note = *((int*)ptr);
+  voicer.noteOn(note, noteAmplitude, group);
+}
+
+void actionKeyOff(bool active, int pin, void* ptr){
+  int note = *((int*)ptr);
+  voicer.noteOff(note, noteAmplitude, group);
+}
+
+// We want to play some notes on the AudioKit keys 
+void setupActions(){
+  // assign buttons to notes
+  auto act_low = AudioActions::ActiveLow;
+  static int note[] = {48,50,52,53,55,57}; // midi keys
+  kit.audioActions().add(PIN_KEY1, actionKeyOn, actionKeyOff, act_low, &(note[0])); // C3
+  kit.audioActions().add(PIN_KEY2, actionKeyOn, actionKeyOff, act_low, &(note[1])); // D3
+  kit.audioActions().add(PIN_KEY3, actionKeyOn, actionKeyOff, act_low, &(note[2])); // E3
+  kit.audioActions().add(PIN_KEY4, actionKeyOn, actionKeyOff, act_low, &(note[3])); // F3
+  kit.audioActions().add(PIN_KEY5, actionKeyOn, actionKeyOff, act_low, &(note[4])); // G3
+  kit.audioActions().add(PIN_KEY6, actionKeyOn, actionKeyOff, act_low, &(note[5])); // A3
+}
+
+void setup() {
+  Serial.begin(9600);
+  AudioLogger::instance().begin(Serial,AudioLogger::Warning);
+
+  voicer.addInstrument(&clarinet, group);
+
+  // define data format
+  auto cfg = kit.defaultConfig(TX_MODE);
+  cfg.channels = 1;
+  cfg.bits_per_sample = 16;
+  cfg.sample_rate = Stk::sampleRate();
+  cfg.sd_active = false;
+  kit.begin(cfg);
+
+  // play notes with keys
+  setupActions();
+
+}
+
+void loop() {
+   for (int j=0;j<1024;j++) {
+      output.tick( voicer.tick() );
+   }
+   kit.processActions();
+}

src/AudioTools/AudioCopy.h

@@ -181,22 +181,28 @@ class StreamCopyT {
         }
 
         /// copies all data - returns true if we copied anything
-        bool copyAll(int delayWithDataMs=5, int delayNoDataMs=1000){
+        bool copyAll(int retryCount=2, int retryWaitMs=2000){
             LOGD(LOG_METHOD);
             bool result = false;
             if (from==nullptr || to == nullptr) 
                 return result;
 
+            int retry = 0;
             // copy whily source has data available
-            size_t available = 1024;
-            while(available){
-                if (copy()) {
-                    result = true;
-                    delay(delayWithDataMs);
+            while (true){
+                int count = copy();
+                if (count==0){
+                    // wait for more data
+                    retry++;
+                    delay(retryWaitMs);
                 } else {
-                    delay(delayNoDataMs);
+                    result = true; // we have some data
+                    retry = 0;
+                }
+                // stop the processing
+                if (retry>retryCount){
+                    break;
                 }
-                available = from->available();
             }
             return result;
         }