128 lines
4.7 KiB
C++
128 lines
4.7 KiB
C++
/*************************************************************************/
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/* audio_effect_pitch_shift.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef AUDIO_EFFECT_PITCH_SHIFT_H
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#define AUDIO_EFFECT_PITCH_SHIFT_H
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#include "servers/audio/audio_effect.h"
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class SMBPitchShift {
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enum {
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MAX_FRAME_LENGTH = 8192
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};
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float gInFIFO[MAX_FRAME_LENGTH];
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float gOutFIFO[MAX_FRAME_LENGTH];
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double gFFTworksp[2 * MAX_FRAME_LENGTH];
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double gLastPhase[MAX_FRAME_LENGTH / 2 + 1];
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double gSumPhase[MAX_FRAME_LENGTH / 2 + 1];
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double gOutputAccum[2 * MAX_FRAME_LENGTH];
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double gAnaFreq[MAX_FRAME_LENGTH];
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double gAnaMagn[MAX_FRAME_LENGTH];
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double gSynFreq[MAX_FRAME_LENGTH];
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double gSynMagn[MAX_FRAME_LENGTH];
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int64_t gRover;
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float lastPitchShift;
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void smbFft(double *fftBuffer, int64_t fftFrameSize, int64_t sign);
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public:
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void PitchShift(float pitchShift, int64_t numSampsToProcess, int64_t fftFrameSize, int64_t osamp, float sampleRate, float *indata, float *outdata, int stride);
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SMBPitchShift() {
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gRover = 0;
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memset(gInFIFO, 0, MAX_FRAME_LENGTH * sizeof(float));
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memset(gOutFIFO, 0, MAX_FRAME_LENGTH * sizeof(float));
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memset(gFFTworksp, 0, 2 * MAX_FRAME_LENGTH * sizeof(double));
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memset(gLastPhase, 0, (MAX_FRAME_LENGTH / 2 + 1) * sizeof(double));
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memset(gSumPhase, 0, (MAX_FRAME_LENGTH / 2 + 1) * sizeof(double));
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memset(gOutputAccum, 0, 2 * MAX_FRAME_LENGTH * sizeof(double));
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memset(gAnaFreq, 0, MAX_FRAME_LENGTH * sizeof(double));
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memset(gAnaMagn, 0, MAX_FRAME_LENGTH * sizeof(double));
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lastPitchShift = 1.0;
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}
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};
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class AudioEffectPitchShift;
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class AudioEffectPitchShiftInstance : public AudioEffectInstance {
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GDCLASS(AudioEffectPitchShiftInstance, AudioEffectInstance);
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friend class AudioEffectPitchShift;
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Ref<AudioEffectPitchShift> base;
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int fft_size;
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SMBPitchShift shift_l;
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SMBPitchShift shift_r;
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public:
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virtual void process(const AudioFrame *p_src_frames, AudioFrame *p_dst_frames, int p_frame_count) override;
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};
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class AudioEffectPitchShift : public AudioEffect {
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GDCLASS(AudioEffectPitchShift, AudioEffect);
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public:
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friend class AudioEffectPitchShiftInstance;
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enum FFTSize {
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FFT_SIZE_256,
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FFT_SIZE_512,
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FFT_SIZE_1024,
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FFT_SIZE_2048,
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FFT_SIZE_4096,
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FFT_SIZE_MAX
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};
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float pitch_scale;
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int oversampling;
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FFTSize fft_size;
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protected:
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static void _bind_methods();
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public:
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Ref<AudioEffectInstance> instantiate() override;
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void set_pitch_scale(float p_pitch_scale);
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float get_pitch_scale() const;
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void set_oversampling(int p_oversampling);
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int get_oversampling() const;
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void set_fft_size(FFTSize);
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FFTSize get_fft_size() const;
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AudioEffectPitchShift();
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};
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VARIANT_ENUM_CAST(AudioEffectPitchShift::FFTSize);
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#endif // AUDIO_EFFECT_PITCH_SHIFT_H
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