mirror of https://github.com/PentHertz/srsLTE.git
64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <strings.h>
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#include <unistd.h>
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#include <math.h>
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#include <time.h>
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#include "liblte/phy/phy.h"
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#include "liblte/phy/resampling/resample_arb.h"
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typedef _Complex float cf_t;
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int main(int argc, char **argv) {
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int N = 100; // Number of sinwave samples
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int delay = 5; // Delay of our resampling filter
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float down = 25.0; // Downsampling rate
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for(int up=1;up<down;up++)
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{
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float rate = up/down;
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printf("Testing rate %f\n", rate);
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cf_t *in = malloc(N*sizeof(cf_t));
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if(!in) {
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perror("malloc");
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exit(-1);
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}
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cf_t *out = malloc(N*sizeof(cf_t));
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if(!out) {
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perror("malloc");
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exit(-1);
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}
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for(int i=0;i<N;i++)
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in[i] = sin(i*2*M_PI/N);
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// Resample
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resample_arb_t r;
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resample_arb_init(&r, rate);
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int n_out = resample_arb_compute(&r, in, out, N);
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// Check interp values
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for(int i=delay+1;i<n_out;i++){
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float idx = i/rate;
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int pre = floor(idx)-delay;
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int post = ceil(idx)-delay;
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int round = roundf(idx)-delay;
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float diff = fabs(creal(in[pre])-creal(in[post]));
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float diff2 = fabs(creal(out[i])-creal(in[round]));
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if(diff2 > diff && pre != post){
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printf("Interpolation failed at index %f", idx);
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exit(-1);
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}
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}
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free(in);
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free(out);
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}
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printf("Ok\n");
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exit(0);
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}
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