105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/*
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* codec2_fft.h
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*
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* Created on: 17.09.2016
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* Author: danilo
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*/
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#ifndef DRIVERS_FREEDV_CODEC2_FFT_H_
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#define DRIVERS_FREEDV_CODEC2_FFT_H_
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#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#ifdef FDV_ARM_MATH
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#include "fdv_arm_math.h"
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#else
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#define USE_KISS_FFT
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#endif
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#include "defines.h"
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#include "comp.h"
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typedef COMP codec2_fft_cpx;
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#include "kiss_fftr.h"
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#ifdef USE_KISS_FFT
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#include "kiss_fft.h"
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typedef kiss_fftr_cfg codec2_fftr_cfg;
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typedef kiss_fft_cfg codec2_fft_cfg;
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typedef kiss_fft_scalar codec2_fft_scalar;
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#else
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typedef float32_t codec2_fft_scalar;
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typedef struct {
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arm_rfft_fast_instance_f32* instance;
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int inverse;
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} codec2_fftr_struct;
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typedef codec2_fftr_struct* codec2_fftr_cfg;
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typedef struct {
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const arm_cfft_instance_f32* instance;
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int inverse;
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} codec2_fft_struct;
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typedef codec2_fft_struct* codec2_fft_cfg;
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#endif
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static inline void codec2_fftr(codec2_fftr_cfg cfg, codec2_fft_scalar* in, codec2_fft_cpx* out)
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{
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#ifdef USE_KISS_FFT
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kiss_fftr(cfg, in, (kiss_fft_cpx*)out);
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#else
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arm_rfft_fast_f32(cfg->instance,in,(float*)out,cfg->inverse);
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out->imag = 0; // remove out[FFT_ENC/2]->real stored in out[0].imag
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#endif
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}
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static inline void codec2_fftri(codec2_fftr_cfg cfg, codec2_fft_cpx* in, codec2_fft_scalar* out)
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{
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#ifdef USE_KISS_FFT
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kiss_fftri(cfg, (kiss_fft_cpx*)in, out);
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#else
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arm_rfft_fast_f32(cfg->instance,(float*)in,out,cfg->inverse);
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// arm_scale_f32(out,cfg->instance->fftLenRFFT,out,cfg->instance->fftLenRFFT);
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#endif
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}
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codec2_fft_cfg codec2_fft_alloc(int nfft, int inverse_fft, void* mem, size_t* lenmem);
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codec2_fftr_cfg codec2_fftr_alloc(int nfft, int inverse_fft, void* mem, size_t* lenmem);
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void codec2_fft_free(codec2_fft_cfg cfg);
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void codec2_fftr_free(codec2_fftr_cfg cfg);
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static inline void codec2_fft(codec2_fft_cfg cfg, codec2_fft_cpx* in, codec2_fft_cpx* out)
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{
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#ifdef USE_KISS_FFT
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kiss_fft(cfg, (kiss_fft_cpx*)in, (kiss_fft_cpx*)out);
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#else
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memcpy(out,in,cfg->instance->fftLen*2*sizeof(float));
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arm_cfft_f32(cfg->instance,(float*)out,cfg->inverse, 1);
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// TODO: this is not nice, but for now required to keep changes minimal
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// however, since main goal is to reduce the memory usage
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// we should convert to an in place interface
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// on PC like platforms the overhead of using the "inplace" kiss_fft calls
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// is neglectable compared to the gain in memory usage on STM32 platforms
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if (cfg->inverse)
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{
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arm_scale_f32((float*)out,cfg->instance->fftLen,(float*)out,cfg->instance->fftLen*2);
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}
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#endif
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}
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void codec2_fft_inplace(codec2_fft_cfg cfg, codec2_fft_cpx* inout);
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#endif
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