closes #11

weak pull to real pitch markers, don't care otherwise

Source/Shifter.cpp

@@ -137,6 +137,39 @@ float Shifter::GetOutputEnvelopePeriodFreeze(int freeze_voice) {
 }
 
 int Shifter::GetPeakIndex() {
+	static float current_index = 0;
+	float smooth = 1 / 200.0f;
+	int diff = in_playhead - current_index;
+	if (diff < 0)
+		diff += BUFFER_SIZE;
+	if (diff < in_period * 2) {
+		diff = last_max_index - current_index;
+		if (diff < -(BUFFER_SIZE / 2))
+			diff += BUFFER_SIZE;
+		if (diff > BUFFER_SIZE / 2)
+			diff -= BUFFER_SIZE;
+
+		float adjust = (float)diff * smooth;
+		if (adjust > 1 || adjust < -1) {
+			int dummy = 0;
+		}
+		current_index += adjust;
+		if ((int)current_index > BUFFER_SIZE) {
+			current_index -= BUFFER_SIZE;
+		}
+		if((int)current_index < 0) {
+			current_index += BUFFER_SIZE;
+		}
+		return (int)current_index;
+	}
+	else {
+		current_index += in_period;
+		if (current_index > BUFFER_SIZE) {
+			current_index -= BUFFER_SIZE;
+		}
+	}
+
+	float threshold = .0075f;
 	int index = in_playhead - in_period * 2;
 	if (index < 0)
 		index += BUFFER_SIZE;
@@ -148,8 +181,17 @@ int Shifter::GetPeakIndex() {
 	{
 		//float val = fabs(in_buffer[index]);
 		float val = in_buffer[index];
+		int period_difference = index - last_max_index;
+		if (period_difference < 0)
+			period_difference += BUFFER_SIZE;
+		//prefer peaks near last peak or near next peak
+		/*if(!((period_difference > in_period * (0-threshold) && period_difference < in_period* (0+threshold)) || (period_difference > in_period * (1-threshold) && period_difference < in_period * (1+threshold)))) {
+			val *= 0.75f;
+		}*/
+
 		if (val > max_value)
 		{
+			
 			max_index = index;
 			max_value = val;
 		}
@@ -158,7 +200,8 @@ int Shifter::GetPeakIndex() {
 			index -= BUFFER_SIZE;
 		}
 	}
-	return max_index;
+	last_max_index = max_index;
+	return (int)current_index;
 }
 
 

Source/Shifter.h

@@ -235,6 +235,7 @@ private:
 	bool enable_autotune = false;
 	float freeze_period;
 	float freeze_volume = 1;
+	int last_max_index = 0;
 	MidiPitchSmoother out_midi_smoother;
 };
 #endif