Merge pull request #10 from Boof2015/VSTs

Add cross platform VSTs

plugin/Source/PluginProcessor.h

@@ -0,0 +1,69 @@
+#pragma once
+
+#include <juce_audio_processors/juce_audio_processors.h>
+#include <atomic>
+#include <vector>
+
+/**
+ * Prism Spectrum — analyzer plugin.
+ *
+ * Passes audio through unchanged. On the realtime thread (processBlock) it writes
+ * the input's L/R into a lock-free FIFO. The editor's frame callback drains the
+ * FIFO off the realtime thread, runs the reused Prism DSP (native/src/spectrum.cpp)
+ * as stereo (so mid + side are available), and pushes magnitudes to the webview.
+ *
+ * UI settings (JSON) are owned here so they survive editor open/close and DAW
+ * session save/restore.
+ */
+class PrismSpectrumProcessor : public juce::AudioProcessor
+{
+public:
+    PrismSpectrumProcessor();
+    ~PrismSpectrumProcessor() override = default;
+
+    void prepareToPlay(double sampleRate, int samplesPerBlock) override;
+    void releaseResources() override {}
+    bool isBusesLayoutSupported(const BusesLayout& layouts) const override;
+    void processBlock(juce::AudioBuffer<float>&, juce::MidiBuffer&) override;
+
+    juce::AudioProcessorEditor* createEditor() override;
+    bool hasEditor() const override { return true; }
+
+    const juce::String getName() const override { return JucePlugin_Name; }
+    bool acceptsMidi() const override { return false; }
+    bool producesMidi() const override { return false; }
+    bool isMidiEffect() const override { return false; }
+    double getTailLengthSeconds() const override { return 0.0; }
+
+    int getNumPrograms() override { return 1; }
+    int getCurrentProgram() override { return 0; }
+    void setCurrentProgram(int) override {}
+    const juce::String getProgramName(int) override { return {}; }
+    void changeProgramName(int, const juce::String&) override {}
+
+    void getStateInformation(juce::MemoryBlock&) override;
+    void setStateInformation(const void*, int) override;
+
+    double getSampleRateHz() const noexcept { return currentSampleRate.load(); }
+
+    /** Copy up to `maxSamples` of buffered L/R audio into the destinations; returns count. */
+    int drainStereo(float* destLeft, float* destRight, int maxSamples) noexcept;
+
+    /** Persisted UI settings as a JSON string (set from the editor, read on save). */
+    void setSettingsJson(const juce::String& json);
+    juce::String getSettingsJson() const;
+
+private:
+    void pushStereoToFifo(const float* left, const float* right, int num) noexcept;
+
+    juce::AbstractFifo fifo { 1 << 16 };
+    std::vector<float> leftBuffer, rightBuffer; // backing storage for `fifo`
+    std::atomic<double> currentSampleRate { 48000.0 };
+
+    juce::CriticalSection settingsLock;
+    juce::String settingsJson;
+    std::atomic<int> editorWidth { 0 };
+    std::atomic<int> editorHeight { 0 };
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(PrismSpectrumProcessor)
+};