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libraries/audio-tools/examples/examples-dsp/examples-maximilian/17-Compressor/17-Compressor.ino

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+
+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/MaximilianDSP.h"
+#include <FS.h>
+#include <SD_MMC.h>
+
+
+// Arduino output
+I2SStream out;
+Maximilian maximilian(out);
+
+// Maximilian
+maxiSample beats; //We give our sample a name. It's called beats this time. We could have loads of them, but they have to have different names.
+maxiDyn compressor; //this is a compressor
+float fout;
+
+void setup() {//some inits
+    // setup logging
+    Serial.begin(115200);
+    AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+    // setup audio output
+    auto cfg = out.defaultConfig(TX_MODE);
+    out.begin(cfg);
+    maximilian.begin(cfg);
+
+    // setup SD to allow file operations
+    if(!SD_MMC.begin()){
+        Serial.println("Card Mount Failed");
+        return;
+    }
+
+    //load in your samples. Provide the full path to a wav file: beat2 is too big
+    //beats.load("/sdcard/Maximilian/beat2.wav");
+    beats.load("/sdcard/Maximilian/snare.wav");
+    Serial.println(beats.getSummary().c_str());//get info on samples if you like.
+    
+    compressor.setAttack(100);
+    compressor.setRelease(300);
+    compressor.setThreshold(0.25);
+    compressor.setRatio(5);
+    
+    //you can set these any time you like.
+    
+}
+
+void play(float *output) {//this is where the magic happens. Very slow magic.
+    //here, we're just compressing the file in real-time
+    //arguments are input,ratio,threshold,attack,release
+    fout=compressor.compress(beats.play());
+    
+    output[0]=fout;
+    output[1]=fout;    
+}
+
+// Arduino loop
+void loop() {
+    maximilian.copy();
+}