add bypass parameter and DSP bypass logic

Source/PluginProcessor.cpp

@@ -21,11 +21,17 @@ SaftpumpeProcessor::SaftpumpeProcessor()
           std::make_unique<juce::AudioParameterFloat>(
               mixID, "Mix", juce::NormalisableRange<float>(0.0f, 1.0f, 0.01f), 1.0f),
            std::make_unique<juce::AudioParameterFloat>(
-               autoReleaseID, "Auto Release", juce::NormalisableRange<float>(0.0f, 1.0f, 0.01f), 1.0f)
+               autoReleaseID, "Auto Release", juce::NormalisableRange<float>(0.0f, 1.0f, 0.01f), 1.0f),
+           std::make_unique<juce::AudioParameterBool>(
+               bypassID, "Bypass", false)
       })
 {
     inputScope.fill(0.0f);
     outputScope.fill(0.0f);
+    fftInput.fill(0.0f);
+    fftOutput.fill(0.0f);
+    inputSpectrum.fill(0.0f);
+    outputSpectrum.fill(0.0f);
 }
 
 SaftpumpeProcessor::~SaftpumpeProcessor() {}
@@ -36,6 +42,7 @@ void SaftpumpeProcessor::prepareToPlay(double sampleRate, int samplesPerBlock) {
     compressorL.reset();
     compressorR.reset();
     scopeIndex = 0;
+    fftIndex = 0;
 }
 
 void SaftpumpeProcessor::releaseResources() {}
@@ -51,6 +58,8 @@ void SaftpumpeProcessor::processBlock(juce::AudioBuffer<float>& buffer, juce::Mi
 
     updateCompressorParams();
 
+    bool bypassed = parameters.getRawParameterValue(bypassID)->load() > 0.5f;
+
     float maxInput = 0.0f;
     float maxOutput = 0.0f;
     float maxGR = 0.0f;
@@ -67,9 +76,16 @@ void SaftpumpeProcessor::processBlock(juce::AudioBuffer<float>& buffer, juce::Mi
         if (absIn > maxInput) maxInput = absIn;
 
         inputScope[scopeIndex] = inL;
+        fftInput[fftIndex] = inL;
 
-        float outL = compressorL.processSample(inL);
-        float outR = compressorR.processSample(inR);
+        float outL, outR;
+        if (bypassed) {
+            outL = inL;
+            outR = inR;
+        } else {
+            outL = compressorL.processSample(inL);
+            outR = compressorR.processSample(inR);
+        }
 
         channelDataL[sample] = outL;
         if (channelDataR) channelDataR[sample] = outR;
@@ -77,11 +93,33 @@ void SaftpumpeProcessor::processBlock(juce::AudioBuffer<float>& buffer, juce::Mi
         float absOut = std::max(std::abs(outL), std::abs(outR));
         if (absOut > maxOutput) maxOutput = absOut;
 
-        float gr = std::abs(compressorL.getGainReduction());
+        float gr = bypassed ? 0.0f : std::abs(compressorL.getGainReduction());
         if (gr > maxGR) maxGR = gr;
 
         outputScope[scopeIndex] = outL;
+        fftOutput[fftIndex] = outL;
         scopeIndex = (scopeIndex + 1) % scopeSize;
+        fftIndex++;
+
+        if (fftIndex >= fftSize) {
+            fftIndex = 0;
+
+            auto computeSpectrum = [&](const std::array<float, fftSize>& input,
+                                       std::array<float, fftSize / 2>& spectrum) {
+                std::array<float, fftSize * 2> buf{};
+                std::copy(input.begin(), input.end(), buf.begin());
+                window.multiplyWithWindowingTable(buf.data(), fftSize);
+                fft.performFrequencyOnlyForwardTransform(buf.data(), true);
+                for (int i = 0; i < fftSize / 2; ++i) {
+                    float db = (buf[i] > 0.00001f) ? 20.0f * std::log10(buf[i]) : -100.0f;
+                    float norm = juce::jlimit(0.0f, 1.0f, (db + 80.0f) / 80.0f);
+                    spectrum[i] = spectrum[i] * 0.7f + norm * 0.3f;
+                }
+            };
+
+            computeSpectrum(fftInput, inputSpectrum);
+            computeSpectrum(fftOutput, outputSpectrum);
+        }
     }
 
     currentInputLevel = currentInputLevel * 0.8f + (maxInput > 0.0001f ? 20.0f * std::log10(maxInput) : -100.0f) * 0.2f;

Source/PluginProcessor.h

@@ -1,5 +1,6 @@
 #pragma once
 #include <juce_audio_processors/juce_audio_processors.h>
+#include <juce_dsp/juce_dsp.h>
 #include "CompressorDSP.h"
 
 class SaftpumpeProcessor : public juce::AudioProcessor {
@@ -39,6 +40,7 @@ public:
     static constexpr const char* makeupID = "makeup";
     static constexpr const char* mixID = "mix";
     static constexpr const char* autoReleaseID = "autoRelease";
+    static constexpr const char* bypassID = "bypass";
 
     juce::AudioProcessorValueTreeState parameters;
 
@@ -46,11 +48,25 @@ public:
     float getInputLevel() const { return currentInputLevel; }
     float getOutputLevel() const { return currentOutputLevel; }
 
+    bool isSpectrumMode() const { return spectrumMode; }
+    void setSpectrumMode(bool on) { spectrumMode = on; }
+
     static constexpr int scopeSize = 512;
     std::array<float, scopeSize> inputScope{};
     std::array<float, scopeSize> outputScope{};
     int scopeIndex = 0;
 
+    static constexpr int fftOrder = 10;
+    static constexpr int fftSize = 1 << fftOrder;
+    std::array<float, fftSize> fftInput{};
+    std::array<float, fftSize> fftOutput{};
+    int fftIndex = 0;
+    juce::dsp::FFT fft{ fftOrder };
+    juce::dsp::WindowingFunction<float> window{ fftSize, juce::dsp::WindowingFunction<float>::hann, true };
+    std::array<float, fftSize / 2> inputSpectrum{};
+    std::array<float, fftSize / 2> outputSpectrum{};
+    bool spectrumMode = false;
+
 private:
     CompressorDSP compressorL;
     CompressorDSP compressorR;