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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include "celt_types.h"
#include "bands.h"
#include <math.h>
#define MAX_SIZE 100
int ret=0;
void test_rotation(int N, int K)
{
int i;
double err = 0, ener = 0, snr, snr0;
celt_word16 x0[MAX_SIZE];
celt_word16 x1[MAX_SIZE];
int nb_rotations = (N+4*K)/(8*K);
for (i=0;i<N;i++)
x1[i] = x0[i] = rand()%32767-16384;
exp_rotation(x1, N, 1, 1, nb_rotations);
for (i=0;i<N;i++)
{
err += (x0[i]-(double)x1[i])*(x0[i]-(double)x1[i]);
ener += x0[i]*(double)x0[i];
}
snr0 = 20*log10(ener/err);
err = ener = 0;
exp_rotation(x1, N, -1, 1, nb_rotations);
for (i=0;i<N;i++)
{
err += (x0[i]-(double)x1[i])*(x0[i]-(double)x1[i]);
ener += x0[i]*(double)x0[i];
}
snr = 20*log10(ener/err);
printf ("SNR for size %d (%d pulses) is %f (was %f without inverse)\n", N, K, snr, snr0);
if (snr < 60 || snr0 > 20)
ret = 1;
}
int main(void)
{
test_rotation(15, 3);
test_rotation(23, 5);
test_rotation(50, 3);
test_rotation(80, 1);
return ret;
}
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