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- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
- #include "kiss_fftr.h"
- #include "_kiss_fft_guts.h"
- #include <stdio.h>
- #include <string.h>
- #define CELT_C
- #include "../celt/stack_alloc.h"
- #include "../celt/kiss_fft.c"
- #include "../celt/kiss_fftr.c"
- #ifdef FIXED_DEBUG
- long long celt_mips=0;
- #endif
- int ret=0;
- static
- kiss_fft_scalar rand_scalar(void)
- {
- return (rand()%32767)-16384;
- }
- static
- double snr_compare( kiss_fft_cpx * vec1,kiss_fft_scalar * vec2, int n)
- {
- int k;
- double sigpow=1e-10, noisepow=1e-10, err,snr;
- vec1[0].i = vec1[n].r;
- for (k=0;k<n;++k) {
- sigpow += (double)vec1[k].r * (double)vec1[k].r +
- (double)vec1[k].i * (double)vec1[k].i;
- err = (double)vec1[k].r - (double)vec2[2*k];
- /*printf ("%f %f\n", (double)vec1[k].r, (double)vec2[2*k]);*/
- noisepow += err * err;
- err = (double)vec1[k].i - (double)vec2[2*k+1];
- /*printf ("%f %f\n", (double)vec1[k].i, (double)vec2[2*k+1]);*/
- noisepow += err * err;
- }
- snr = 10*log10( sigpow / noisepow );
- if (snr<60) {
- printf( "** poor snr: %f **\n", snr);
- ret = 1;
- }
- return snr;
- }
- static
- double snr_compare_scal( kiss_fft_scalar * vec1,kiss_fft_scalar * vec2, int n)
- {
- int k;
- double sigpow=1e-10, noisepow=1e-10, err,snr;
- for (k=0;k<n;++k) {
- sigpow += (double)vec1[k] * (double)vec1[k];
- err = (double)vec1[k] - (double)vec2[k];
- noisepow += err * err;
- }
- snr = 10*log10( sigpow / noisepow );
- if (snr<60) {
- printf( "\npoor snr: %f\n", snr);
- ret = 1;
- }
- return snr;
- }
- #ifdef RADIX_TWO_ONLY
- #define NFFT 1024
- #else
- #define NFFT 8*3*5
- #endif
- #ifndef NUMFFTS
- #define NUMFFTS 10000
- #endif
- int main(void)
- {
- int i;
- kiss_fft_cpx cin[NFFT];
- kiss_fft_cpx cout[NFFT];
- kiss_fft_scalar fin[NFFT];
- kiss_fft_scalar sout[NFFT];
- kiss_fft_cfg kiss_fft_state;
- kiss_fftr_cfg kiss_fftr_state;
- kiss_fft_scalar rin[NFFT+2];
- kiss_fft_scalar rout[NFFT+2];
- kiss_fft_scalar zero;
- ALLOC_STACK;
- memset(&zero,0,sizeof(zero) ); // ugly way of setting short,int,float,double, or __m128 to zero
- for (i=0;i<NFFT;++i) {
- rin[i] = rand_scalar();
- #if defined(FIXED_POINT) && defined(DOUBLE_PRECISION)
- rin[i] *= 32768;
- #endif
- cin[i].r = rin[i];
- cin[i].i = zero;
- }
- kiss_fft_state = opus_fft_alloc(NFFT,0,0);
- kiss_fftr_state = kiss_fftr_alloc(NFFT,0,0);
- opus_fft(kiss_fft_state,cin,cout);
- kiss_fftr(kiss_fftr_state,rin,sout);
- printf( "nfft=%d, inverse=%d, snr=%g\n",
- NFFT,0, snr_compare(cout,sout,(NFFT/2)) );
- memset(cin,0,sizeof(cin));
- cin[0].r = rand_scalar();
- cin[NFFT/2].r = rand_scalar();
- for (i=1;i< NFFT/2;++i) {
- //cin[i].r = (kiss_fft_scalar)(rand()-RAND_MAX/2);
- cin[i].r = rand_scalar();
- cin[i].i = rand_scalar();
- }
- // conjugate symmetry of real signal
- for (i=1;i< NFFT/2;++i) {
- cin[NFFT-i].r = cin[i].r;
- cin[NFFT-i].i = - cin[i].i;
- }
- #ifdef FIXED_POINT
- #ifdef DOUBLE_PRECISION
- for (i=0;i< NFFT;++i) {
- cin[i].r *= 32768;
- cin[i].i *= 32768;
- }
- #endif
- for (i=0;i< NFFT;++i) {
- cin[i].r /= NFFT;
- cin[i].i /= NFFT;
- }
- #endif
- fin[0] = cin[0].r;
- fin[1] = cin[NFFT/2].r;
- for (i=1;i< NFFT/2;++i)
- {
- fin[2*i] = cin[i].r;
- fin[2*i+1] = cin[i].i;
- }
- opus_ifft(kiss_fft_state,cin,cout);
- kiss_fftri(kiss_fftr_state,fin,rout);
- /*
- printf(" results from inverse opus_fft : (%f,%f), (%f,%f), (%f,%f), (%f,%f), (%f,%f) ...\n "
- , (float)cout[0].r , (float)cout[0].i , (float)cout[1].r , (float)cout[1].i , (float)cout[2].r , (float)cout[2].i , (float)cout[3].r , (float)cout[3].i , (float)cout[4].r , (float)cout[4].i
- );
- printf(" results from inverse kiss_fftr: %f,%f,%f,%f,%f ... \n"
- ,(float)rout[0] ,(float)rout[1] ,(float)rout[2] ,(float)rout[3] ,(float)rout[4]);
- */
- for (i=0;i<NFFT;++i) {
- sout[i] = cout[i].r;
- }
- printf( "nfft=%d, inverse=%d, snr=%g\n",
- NFFT,1, snr_compare_scal(rout,sout,NFFT) );
- free(kiss_fft_state);
- free(kiss_fftr_state);
- return ret;
- }
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