1 files changed, 89 insertions, 0 deletions
diff --git a/servers/audio/effects/audio_effect_pitch_shift.h b/servers/audio/effects/audio_effect_pitch_shift.h
new file mode 100644
index 0000000000..d1343a0745
--- /dev/null
+++ b/servers/audio/effects/audio_effect_pitch_shift.h
@@ -0,0 +1,89 @@
+#ifndef AUDIO_EFFECT_PITCH_SHIFT_H
+#define AUDIO_EFFECT_PITCH_SHIFT_H
+
+
+#include "servers/audio/audio_effect.h"
+
+class SMBPitchShift {
+
+	enum {
+		MAX_FRAME_LENGTH=8192
+	};
+
+	float gInFIFO[MAX_FRAME_LENGTH];
+	float gOutFIFO[MAX_FRAME_LENGTH];
+	float gFFTworksp[2*MAX_FRAME_LENGTH];
+	float gLastPhase[MAX_FRAME_LENGTH/2+1];
+	float gSumPhase[MAX_FRAME_LENGTH/2+1];
+	float gOutputAccum[2*MAX_FRAME_LENGTH];
+	float gAnaFreq[MAX_FRAME_LENGTH];
+	float gAnaMagn[MAX_FRAME_LENGTH];
+	float gSynFreq[MAX_FRAME_LENGTH];
+	float gSynMagn[MAX_FRAME_LENGTH];
+	long gRover;
+
+	void smbFft(float *fftBuffer, long fftFrameSize, long sign);
+public:
+	void PitchShift(float pitchShift, long numSampsToProcess, long fftFrameSize, long osamp, float sampleRate, float *indata, float *outdata, int stride);
+
+	SMBPitchShift() {
+		gRover=0;
+		memset(gInFIFO, 0, MAX_FRAME_LENGTH*sizeof(float));
+		memset(gOutFIFO, 0, MAX_FRAME_LENGTH*sizeof(float));
+		memset(gFFTworksp, 0, 2*MAX_FRAME_LENGTH*sizeof(float));
+		memset(gLastPhase, 0, (MAX_FRAME_LENGTH/2+1)*sizeof(float));
+		memset(gSumPhase, 0, (MAX_FRAME_LENGTH/2+1)*sizeof(float));
+		memset(gOutputAccum, 0, 2*MAX_FRAME_LENGTH*sizeof(float));
+		memset(gAnaFreq, 0, MAX_FRAME_LENGTH*sizeof(float));
+		memset(gAnaMagn, 0, MAX_FRAME_LENGTH*sizeof(float));
+	}
+
+
+};
+
+
+class AudioEffectPitchShift;
+
+class AudioEffectPitchShiftInstance : public AudioEffectInstance {
+	GDCLASS(AudioEffectPitchShiftInstance,AudioEffectInstance)
+friend class AudioEffectPitchShift;
+	Ref<AudioEffectPitchShift> base;
+
+	SMBPitchShift shift_l;
+	SMBPitchShift shift_r;
+
+
+public:
+
+	virtual void process(const AudioFrame *p_src_frames,AudioFrame *p_dst_frames,int p_frame_count);
+
+};
+
+
+class AudioEffectPitchShift : public AudioEffect {
+	GDCLASS(AudioEffectPitchShift,AudioEffect)
+
+friend class AudioEffectPitchShiftInstance;
+
+	float pitch_scale;
+	int window_size;
+	float wet;
+	float dry;
+	bool filter;
+
+protected:
+
+	static void _bind_methods();
+public:
+
+
+	Ref<AudioEffectInstance> instance();
+
+	void set_pitch_scale(float p_adjust);
+	float get_pitch_scale() const;
+
+	AudioEffectPitchShift();
+};
+
+
+#endif // AUDIO_EFFECT_PITCH_SHIFT_H