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Diffstat (limited to 'celt/tests/real-fft-test.c')
| -rw-r--r-- | celt/tests/real-fft-test.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/celt/tests/real-fft-test.c b/celt/tests/real-fft-test.c new file mode 100644 index 00000000..3f3f7b23 --- /dev/null +++ b/celt/tests/real-fft-test.c @@ -0,0 +1,171 @@ +#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; +} |