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/*************************************************************************/
/* audio_effect_pitch_shift.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#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;
int fft_size;
SMBPitchShift shift_l;
SMBPitchShift shift_r;
public:
virtual void process(const AudioFrame *p_src_frames, AudioFrame *p_dst_frames, int p_frame_count) override;
};
class AudioEffectPitchShift : public AudioEffect {
GDCLASS(AudioEffectPitchShift, AudioEffect);
public:
friend class AudioEffectPitchShiftInstance;
enum FFTSize {
FFT_SIZE_256,
FFT_SIZE_512,
FFT_SIZE_1024,
FFT_SIZE_2048,
FFT_SIZE_4096,
FFT_SIZE_MAX
};
float pitch_scale;
int oversampling;
FFTSize fft_size;
float wet;
float dry;
bool filter;
protected:
static void _bind_methods();
public:
Ref<AudioEffectInstance> instantiate() override;
void set_pitch_scale(float p_pitch_scale);
float get_pitch_scale() const;
void set_oversampling(int p_oversampling);
int get_oversampling() const;
void set_fft_size(FFTSize);
FFTSize get_fft_size() const;
AudioEffectPitchShift();
};
VARIANT_ENUM_CAST(AudioEffectPitchShift::FFTSize);
#endif // AUDIO_EFFECT_PITCH_SHIFT_H
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