1 files changed, 76 insertions, 0 deletions
diff --git a/servers/audio/effects/audio_effect_spectrum_analyzer.h b/servers/audio/effects/audio_effect_spectrum_analyzer.h
new file mode 100644
index 0000000000..0534426da3
--- /dev/null
+++ b/servers/audio/effects/audio_effect_spectrum_analyzer.h
@@ -0,0 +1,76 @@
+#ifndef AUDIO_EFFECT_SPECTRUM_ANALYZER_H
+#define AUDIO_EFFECT_SPECTRUM_ANALYZER_H
+
+#include "servers/audio/audio_effect.h"
+
+class AudioEffectSpectrumAnalyzer;
+
+class AudioEffectSpectrumAnalyzerInstance : public AudioEffectInstance {
+	GDCLASS(AudioEffectSpectrumAnalyzerInstance, AudioEffectInstance)
+
+public:
+	enum MagnitudeMode {
+		MAGNITUDE_AVERAGE,
+		MAGNITUDE_MAX,
+	};
+
+private:
+	friend class AudioEffectSpectrumAnalyzer;
+	Ref<AudioEffectSpectrumAnalyzer> base;
+
+	Vector<Vector<AudioFrame> > fft_history;
+	Vector<float> temporal_fft;
+	int temporal_fft_pos;
+	int fft_size;
+	int fft_count;
+	int fft_pos;
+	float mix_rate;
+	uint64_t last_fft_time;
+
+protected:
+	static void _bind_methods();
+
+public:
+	virtual void process(const AudioFrame *p_src_frames, AudioFrame *p_dst_frames, int p_frame_count);
+	Vector2 get_magnitude_for_frequency_range(float p_begin, float p_end, MagnitudeMode p_mode = MAGNITUDE_MAX) const;
+};
+
+VARIANT_ENUM_CAST(AudioEffectSpectrumAnalyzerInstance::MagnitudeMode)
+
+class AudioEffectSpectrumAnalyzer : public AudioEffect {
+	GDCLASS(AudioEffectSpectrumAnalyzer, AudioEffect)
+public:
+	enum FFT_Size {
+		FFT_SIZE_256,
+		FFT_SIZE_512,
+		FFT_SIZE_1024,
+		FFT_SIZE_2048,
+		FFT_SIZE_4096,
+		FFT_SIZE_MAX
+	};
+
+public:
+	friend class AudioEffectSpectrumAnalyzerInstance;
+	float buffer_length;
+	float tapback_pos;
+	FFT_Size fft_size;
+
+protected:
+	static void _bind_methods();
+
+public:
+	Ref<AudioEffectInstance> instance();
+	void set_buffer_length(float p_seconds);
+	float get_buffer_length() const;
+	void set_tap_back_pos(float p_seconds);
+	float get_tap_back_pos() const;
+
+	void set_fft_size(FFT_Size);
+	FFT_Size get_fft_size() const;
+
+	AudioEffectSpectrumAnalyzer();
+};
+
+VARIANT_ENUM_CAST(AudioEffectSpectrumAnalyzer::FFT_Size);
+
+#endif // AUDIO_EFFECT_SPECTRUM_ANALYZER_H