fft qt 代码_spek-fft.h

#ifndef SPEKFFT_H

#define SPEKFFT_H

#include

#include

extern "C" {

#include

}

class FFTPlan;

class FFT

{

public:

FFT() {}

std::unique_ptr create(int nbits);

};

class FFTPlan

{

public:

FFTPlan(int nbits) :

input_size(1 << nbits), output_size((1 << (nbits - 1)) + 1),

output(output_size)

{

// FFmpeg uses various assembly optimizations which expect

// input data to be aligned by up to 32 bytes (e.g. AVX)

this->input = (float*) av_malloc(sizeof(float) * input_size);

}

virtual ~FFTPlan()

{

av_freep(&this->input);

}

int get_input_size() const { return this->input_size; }

int get_output_size() const { return this->output_size; }

float get_input(int i) const { return this->input[i]; }

void set_input(int i, float v) { this->input[i] = v; }

float get_output(int i) const { return this->output[i]; }

void set_output(int i, float v) { this->output[i] = v; }

virtual void execute() = 0;

protected:

float *get_input() { return this->input; }

private:

int input_size;

int output_size;

float *input;

std::vector output;

};

#endif

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