mitigate looped playback issue

some hosts resize the buffer at the turnaround point of the playback loop. This seemed to cause issues with the feedbackbuffer. To mitigate this issue for now the feedbackbuffer will only be summed to the input, if the buffersize is unchanged.

source/PluginEditor.cpp

@@ -103,7 +103,7 @@ void SG323AudioProcessorEditor::paint(juce::Graphics& g)
 
     g.setColour(juce::Colours::white);
     g.setFont(15.0f);
-    g.drawFittedText ("v0.6.3", getLocalBounds(), juce::Justification::bottomRight, 1);
+    g.drawFittedText ("v0.6.3_20230912a", getLocalBounds(), juce::Justification::bottomRight, 1);
 }
 
 void SG323AudioProcessorEditor::resized()

source/PluginProcessor.cpp

@@ -466,12 +466,12 @@ void SG323AudioProcessor::processBlock(juce::AudioBuffer<float> &buffer, juce::M
     preEmphasis.process(juce::dsp::ProcessContextReplacing<float>(monoBlock));
     inputHighPass.process(juce::dsp::ProcessContextReplacing<float>(monoBlock));
     inputLowPass.process(juce::dsp::ProcessContextReplacing<float>(monoBlock));
-    // pre-process feedback buffer
-    feedBackHighPass.process(juce::dsp::ProcessContextReplacing<float>(feedbackBlock));
-    feedBackLowPass.process(juce::dsp::ProcessContextReplacing<float>(feedbackBlock));
-    feedBackDip.process(juce::dsp::ProcessContextReplacing<float>(feedbackBlock));
-    // sum input buffer & feedback buffer together
-    monoBuffer.addFrom(0, 0, feedbackBuffer, 0, 0, bufferSize);
+    // mitigation for looped playback
+    if (lastBufferSize == bufferSize)
+    {
+        // sum input buffer & feedback buffer together
+        monoBuffer.addFrom(0, 0, feedbackBuffer, 0, 0, bufferSize);
+    }
     // round samples to 16bit values
     for (int i = 0; i < bufferSize; ++i)
     {
@@ -668,6 +668,12 @@ void SG323AudioProcessor::processBlock(juce::AudioBuffer<float> &buffer, juce::M
         buffer.copyFromWithRamp(channel, 0, drySignal, bufferSize, dryLevel, dryLevel);
         buffer.addFromWithRamp(channel, 0, wetSignal, bufferSize, mixLevel, mixLevel);
     }
+    // pre-process feedback buffer
+    feedBackHighPass.process(juce::dsp::ProcessContextReplacing<float>(feedbackBlock));
+    feedBackLowPass.process(juce::dsp::ProcessContextReplacing<float>(feedbackBlock));
+    feedBackDip.process(juce::dsp::ProcessContextReplacing<float>(feedbackBlock));
+    // set lastBufferSize variable
+    lastBufferSize = bufferSize;
 }
 
 //==============================================================================

source/PluginProcessor.h

@@ -115,6 +115,7 @@ class SG323AudioProcessor : public juce::AudioProcessor
     unsigned int gainModContBaseAddr{};
     unsigned int gainModBaseAddr{};
     unsigned int delayModBaseAddr{};
+    unsigned int lastBufferSize{};
 
     float s1a0{ 1.0f };
     float s1a1{ 1.0f };