Severeal fixes - especially the memory violation in the master loop and

the handling of the audio queues.

MicroMDAPiano.ino

@@ -52,7 +52,7 @@ AudioConnection          patchCord6(volume_l, 0, pt8211_1, 1);
 #endif
 // GUItool: end automatically generated code
 
-mdaEPiano* ep = new mdaEPiano();
+mdaEPiano* ep;
 bool sd_card_available = false;
 uint8_t midi_channel = DEFAULT_MIDI_CHANNEL;
 uint32_t xrun = 0;
@@ -105,7 +105,6 @@ void setup()
   enc1.write(INITIAL_ENC1_VALUE);
 #endif
 
-  delay(500);
   Serial.println(F("MicroMDAEPiano based on https://sourceforge.net/projects/mda-vst"));
   Serial.println(F("(c)2018 H. Wirtz <wirtz@parasitstudio.de>"));
   Serial.println(F("https://about.teahub.io/dcoredump/MicroMDAEpiano"));
@@ -114,7 +113,8 @@ void setup()
   Serial.println(F(" bytes"));
   Serial.println();
   Serial.println(F("<setup start>"));
-  delay(1000);
+
+  ep = new mdaEPiano();
 
   initial_values_from_eeprom();
 
@@ -135,10 +135,12 @@ void setup()
   //sgtl5000_1.dacVolumeRamp();
   sgtl5000_1.dacVolumeRampLinear();
   sgtl5000_1.unmuteHeadphone();
+  sgtl5000_1.unmuteLineout();
   sgtl5000_1.autoVolumeDisable(); // turn off AGC
   sgtl5000_1.volume(1.0, 1.0);
 #endif
-  //set_volume(vol, vol_left, vol_right);
+
+  set_volume(vol, vol_left, vol_right);
 
   // start SD card
   SPI.setMOSI(SDCARD_MOSI_PIN);
@@ -185,8 +187,12 @@ void loop()
   int16_t* audio_buffer_l; // pointer to AUDIO_BLOCK_SAMPLES * int16_t
   const uint16_t audio_block_time_ms = 1000000 / (SAMPLE_RATE / AUDIO_BLOCK_SAMPLES);
 
-  while (42 == 42) // DON'T PANIC!
+  // Main sound calculation
+  if (queue_r.available() && queue_l.available())
   {
+    audio_buffer_r = queue_r.getBuffer();
+    audio_buffer_l = queue_l.getBuffer();
+
 #if defined (DEBUG) && defined (SHOW_CPU_LOAD_MSEC)
     if (cpu_mem_millis > SHOW_CPU_LOAD_MSEC)
     {
@@ -207,12 +213,9 @@ void loop()
     {
       Serial.println(F("E: audio_buffer_l allocation problems!"));
     }
-    
-    if (!queue_r.available() || !queue_l.available())
-      continue;
 
     elapsedMicros t1;
-    ep->process(&audio_buffer_l,&audio_buffer_r,AUDIO_BLOCK_SAMPLES);
+    ep->process(audio_buffer_l, audio_buffer_r, AUDIO_BLOCK_SAMPLES);
     uint32_t t2 = t1;
     if (t2 > audio_block_time_ms) // everything greater 2.9ms is a buffer underrun!
       xrun++;
@@ -229,14 +232,17 @@ void loop()
         peak++;
     }
 #ifndef TEENSY_AUDIO_BOARD
-    for (uint8_t i = 0; i <= AUDIO_BLOCK_SAMPLES; i++)
+    for (uint8_t i = 0; i < AUDIO_BLOCK_SAMPLES; i++)
+    {
       audio_buffer_r[i] *= vol_r;
-    audio_buffer_l[i] *= vol_l;
+      audio_buffer_l[i] *= vol_l;
+    }
 #endif
     queue_r.playBuffer();
     queue_l.playBuffer();
   }
 }
+
 void handle_input(void)
 {
 #ifdef USE_ONBOARD_USB_HOST
@@ -743,4 +749,3 @@ void note_off(void)
   queue_midi_event(0x80, TEST_NOTE + 60, 0);      // 16
 }
 #endif
-

config.h

@@ -32,7 +32,7 @@
 #define MIDI_DEVICE Serial1
 //#define USE_ONBOARD_USB_HOST 1
 #define TEENSY_AUDIO_BOARD 1
-#define VOLUME 0.6
+#define VOLUME 0.3
 #define DEFAULT_MIDI_CHANNEL MIDI_CHANNEL_OMNI
 #define AUDIO_MEM 4
 #define SAMPLE_RATE 44100

mdaEPiano.cpp

@@ -90,23 +90,27 @@ mdaEPiano::mdaEPiano() // mdaEPiano::mdaEPiano(audioMasterCallback audioMaster)
   kgrp[31].pos = 406046;  kgrp[31].end = 414486;  kgrp[31].loop = 2306; //ghost
   kgrp[32].pos = 414487;  kgrp[32].end = 422408;  kgrp[32].loop = 2169;
 
-  //extra xfade looping...
-  for (int32_t k = 0; k < 28; k++)
-  {
-    int32_t p0 = kgrp[k].end;
-    int32_t p1 = kgrp[k].end - kgrp[k].loop;
+  /*
+    //extra xfade looping...
+    for (int32_t k = 0; k < 28; k++)
+    {
+      int32_t p0 = kgrp[k].end;
+      int32_t p1 = kgrp[k].end - kgrp[k].loop;
 
-    float xf = 1.0f;
-    float dxf = -0.02f;
+      float xf = 1.0f;
+      float dxf = -0.02f;
 
-    while (xf > 0.0f)
-    {
-      waves[p0] = (short)((1.0f - xf) * (float)waves[p0] + xf * (float)waves[p1]);
-      p0--;
-      p1--;
-      xf += dxf;
-    }
-  }
+      Serial.println("3");
+
+      while (xf > 0.0f)
+      {
+        waves[p0] = (short)((1.0f - xf) * (float)waves[p0] + xf * (float)waves[p1]);
+
+        p0--;
+        p1--;
+        xf += dxf;
+      }
+    }*/
 
   //initialise...
   for (int32_t v = 0; v < NVOICES; v++)
@@ -329,10 +333,8 @@ float mdaEPiano::getParameter(int32_t index)     {
   }
 */
 
-void mdaEPiano::process(int16_t **outputs_r, int16_t **outputs_l, int32_t sampleFrames)
+void mdaEPiano::process(int16_t *outputs_r, int16_t *outputs_l, int32_t sampleFrames)
 {
-  int16_t* out_l = outputs_r[0];
-  int16_t* out_r = outputs_l[0];
   int32_t event = 0, frame = 0, frames, v;
   float x, l, r, od = overdrive;
   int32_t i;
@@ -355,10 +357,12 @@ void mdaEPiano::process(int16_t **outputs_r, int16_t **outputs_l, int32_t sample
         V->pos += V->frac >> 16;
         V->frac &= 0xFFFF;
         if (V->pos > V->end) V->pos -= V->loop;
-        i = waves[V->pos];
-        i = (i << 7) + (V->frac >> 9) * (waves[V->pos + 1] - i) + 0x40400000;
+        //i = waves[V->pos];
+        //i = (i << 7) + (V->frac >> 9) * (waves[V->pos + 1] - i) + 0x40400000;  //not working on intel mac !?!
         //x = V->env * (*(float *)&i - 3.0f);  //fast int->float
-        x = V->env * (float(i) - 3.0f);
+        //x = V->env * (float)i / 32768.0f;
+        i = waves[V->pos] + ((V->frac * (waves[V->pos + 1] - waves[V->pos])) >> 16);
+        x = V->env * (float)i / 32768.0f;
 
         V->env = V->env * V->dec;  //envelope
 
@@ -382,8 +386,8 @@ void mdaEPiano::process(int16_t **outputs_r, int16_t **outputs_l, int32_t sample
       l += l * lmod * lfo1;
       r += r * rmod * lfo1;  //worth making all these local variables?
 
-      *out_r++ = static_cast<int16_t>(l * 0x8000);
-      *out_l++ = static_cast<int16_t>(r * 0x8000);
+      outputs_r[sampleFrames - frames] = static_cast<int16_t>(r * 0x8000);
+      outputs_l[sampleFrames - frames] = static_cast<int16_t>(l * 0x8000);
     }
 
     if (frame < sampleFrames)

mdaEPiano.h

@@ -60,7 +60,7 @@ public:
 	  mdaEPiano(); // mdaEPiano(audioMasterCallback audioMaster);
 	~mdaEPiano();
 
-	virtual void process(int16_t **outputs_r, int16_t **outputs_l, int32_t sampleFrames);
+  virtual void process(int16_t *outputs_r, int16_t *outputs_l, int32_t sampleFrames);
   virtual bool processMidiMessage(uint8_t type, uint8_t data1, uint8_t data2);
 	virtual void setProgram(int32_t program);
 	//virtual void setProgramName(char *name);