Chris@366: #!/usr/bin/env python
Chris@366: 
Chris@366: import FFT
Chris@366: import sys
Chris@366: import random
Chris@366: import re
Chris@366: j=complex(0,1)
Chris@366: 
Chris@366: def randvec(n,iscomplex):
Chris@366:     if iscomplex:
Chris@366:         return [
Chris@366:                 int(random.uniform(-32768,32767) ) + j*int(random.uniform(-32768,32767) )
Chris@366:                 for i in range(n) ]
Chris@366:     else:                
Chris@366:         return [ int(random.uniform(-32768,32767) ) for i in range(n) ]
Chris@366:     
Chris@366: def c_format(v,round=0):
Chris@366:     if round:
Chris@366:         return ','.join( [ '{%d,%d}' %(int(c.real),int(c.imag) ) for c in v ] ) 
Chris@366:     else:
Chris@366:         s= ','.join( [ '{%.60f ,%.60f }' %(c.real,c.imag) for c in v ] ) 
Chris@366:         return re.sub(r'\.?0+ ',' ',s)
Chris@366: 
Chris@366: def test_cpx( n,inverse ,short):
Chris@366:     v = randvec(n,1)
Chris@366:     scale = 1
Chris@366:     if short:
Chris@366:         minsnr=30
Chris@366:     else:
Chris@366:         minsnr=100
Chris@366: 
Chris@366:     if inverse:
Chris@366:         tvecout = FFT.inverse_fft(v)
Chris@366:         if short:
Chris@366:             scale = 1
Chris@366:         else:            
Chris@366:             scale = len(v)
Chris@366:     else:
Chris@366:         tvecout = FFT.fft(v)
Chris@366:         if short:
Chris@366:             scale = 1.0/len(v)
Chris@366: 
Chris@366:     tvecout = [ c * scale for c in tvecout ]
Chris@366: 
Chris@366: 
Chris@366:     s="""#define NFFT %d""" % len(v) + """
Chris@366:     {
Chris@366:         double snr;
Chris@366:         kiss_fft_cpx test_vec_in[NFFT] = { """  + c_format(v) + """};
Chris@366:         kiss_fft_cpx test_vec_out[NFFT] = {"""  + c_format( tvecout ) + """};
Chris@366:         kiss_fft_cpx testbuf[NFFT];
Chris@366:         void * cfg = kiss_fft_alloc(NFFT,%d,0,0);""" % inverse + """
Chris@366: 
Chris@366:         kiss_fft(cfg,test_vec_in,testbuf);
Chris@366:         snr = snr_compare(test_vec_out,testbuf,NFFT);
Chris@366:         printf("DATATYPE=" xstr(kiss_fft_scalar) ", FFT n=%d, inverse=%d, snr = %g dB\\n",NFFT,""" + str(inverse) + """,snr);
Chris@366:         if (snr<""" + str(minsnr) + """)
Chris@366:             exit_code++;
Chris@366:         free(cfg);
Chris@366:     }
Chris@366: #undef NFFT    
Chris@366: """
Chris@366:     return s
Chris@366: 
Chris@366: def compare_func():
Chris@366:     s="""
Chris@366: #define xstr(s) str(s)
Chris@366: #define str(s) #s
Chris@366: double snr_compare( kiss_fft_cpx * test_vec_out,kiss_fft_cpx * testbuf, int n)
Chris@366: {
Chris@366:     int k;
Chris@366:     double sigpow,noisepow,err,snr,scale=0;
Chris@366:     kiss_fft_cpx err;
Chris@366:     sigpow = noisepow = .000000000000000000000000000001; 
Chris@366: 
Chris@366:     for (k=0;k<n;++k) {
Chris@366:         sigpow += test_vec_out[k].r * test_vec_out[k].r + 
Chris@366:                   test_vec_out[k].i * test_vec_out[k].i;
Chris@366:         C_SUB(err,test_vec_out[k],testbuf[k].r);
Chris@366:         noisepow += err.r * err.r + err.i + err.i;
Chris@366: 
Chris@366:         if (test_vec_out[k].r)
Chris@366:             scale += testbuf[k].r / test_vec_out[k].r;
Chris@366:     }
Chris@366:     snr = 10*log10( sigpow / noisepow );
Chris@366:     scale /= n;
Chris@366:     if (snr<10)
Chris@366:         printf( "\\npoor snr, try a scaling factor %f\\n" , scale );
Chris@366:     return snr;
Chris@366: }
Chris@366: """
Chris@366:     return s
Chris@366: 
Chris@366: def main():
Chris@366: 
Chris@366:     from getopt import getopt
Chris@366:     opts,args = getopt(sys.argv[1:],'s')
Chris@366:     opts = dict(opts)
Chris@366:     short = int( opts.has_key('-s') )
Chris@366: 
Chris@366:     fftsizes = args
Chris@366:     if not fftsizes:
Chris@366:         fftsizes = [ 1800 ]
Chris@366:     print '#include "kiss_fft.h"'
Chris@366:     print compare_func()
Chris@366:     print "int main() { int exit_code=0;\n"
Chris@366:     for n in fftsizes:
Chris@366:         n = int(n)
Chris@366:         print test_cpx(n,0,short)
Chris@366:         print test_cpx(n,1,short)
Chris@366:     print """
Chris@366:     return exit_code;
Chris@366: }
Chris@366: """
Chris@366: 
Chris@366: if __name__ == "__main__":
Chris@366:     main()