text: #ifdef HAVE_CONFIG_H
  #include "config.h"
  #endif
  
  #include <stdio.h>
  #include "mdct.h"
  #define CELT_C 
  #include "../libcelt/stack_alloc.h"
  
  #include "../libcelt/kiss_fft.c"
  #include "../libcelt/mdct.c"
  
  #ifndef M_PI
  #define M_PI 3.141592653
  #endif
  
  #ifdef FIXED_DEBUG  
  long long celt_mips=0;
  #endif
  int ret = 0;
  void check(kiss_fft_scalar  * in,kiss_fft_scalar  * out,int nfft,int isinverse)
  {
      int bin,k;
      double errpow=0,sigpow=0;
      double snr;
      for (bin=0;bin<nfft/2;++bin) {
          double ansr = 0;
          double difr;
  
          for (k=0;k<nfft;++k) {
             double phase = 2*M_PI*(k+.5+.25*nfft)*(bin+.5)/nfft;
             double re = cos(phase);
              
             re /= nfft/4;
  
             ansr += in[k] * re;
          }
          /*printf ("%f %f\n", ansr, out[bin]);*/
          difr = ansr - out[bin];
          errpow += difr*difr;
          sigpow += ansr*ansr;
      }
      snr = 10*log10(sigpow/errpow);
      printf("nfft=%d inverse=%d,snr = %f\n",nfft,isinverse,snr );
      if (snr<60) {
         printf( "** poor snr: %f **\n", snr);
         ret = 1;
      }
  }
  
  void check_inv(kiss_fft_scalar  * in,kiss_fft_scalar  * out,int nfft,int isinverse)
  {
     int bin,k;
     double errpow=0,sigpow=0;
     double snr;
     for (bin=0;bin<nfft;++bin) {
        double ansr = 0;
        double difr;
  
        for (k=0;k<nfft/2;++k) {
           double phase = 2*M_PI*(bin+.5+.25*nfft)*(k+.5)/nfft;
           double re = cos(phase);
  
           //re *= 2;
  
           ansr += in[k] * re;
        }
        /*printf ("%f %f\n", ansr, out[bin]);*/
        difr = ansr - out[bin];
        errpow += difr*difr;
        sigpow += ansr*ansr;
     }
     snr = 10*log10(sigpow/errpow);
     printf("nfft=%d inverse=%d,snr = %f\n",nfft,isinverse,snr );
     if (snr<60) {
        printf( "** poor snr: %f **\n", snr);
        ret = 1;
     }
  }
  
  
  void test1d(int nfft,int isinverse)
  {
      mdct_lookup cfg;
      size_t buflen = sizeof(kiss_fft_scalar)*nfft;
  
      kiss_fft_scalar  * in = (kiss_fft_scalar*)malloc(buflen);
      kiss_fft_scalar  * out= (kiss_fft_scalar*)malloc(buflen);
      celt_word16  * window= (celt_word16*)malloc(sizeof(celt_word16)*nfft/2);
      int k;
  
      clt_mdct_init(&cfg, nfft);
      for (k=0;k<nfft;++k) {
          in[k] = (rand() % 32768) - 16384;
      }
  
      for (k=0;k<nfft/2;++k) {
         window[k] = Q15ONE;
      }
  #ifdef DOUBLE_PRECISION
      for (k=0;k<nfft;++k) {
         in[k] *= 32768;
      }
  #endif
      
      if (isinverse)
      {
         for (k=0;k<nfft;++k) {
            in[k] /= nfft;
         }
      }
      
      /*for (k=0;k<nfft;++k) printf("%d %d ", in[k].r, in[k].i);printf("\n");*/
         
      if (isinverse)
      {
         for (k=0;k<nfft;++k)
            out[k] = 0;
         clt_mdct_backward(&cfg,in,out, window, nfft/2);
         check_inv(in,out,nfft,isinverse);
      } else {
         clt_mdct_forward(&cfg,in,out,window, nfft/2);
         check(in,out,nfft,isinverse);
      }
      /*for (k=0;k<nfft;++k) printf("%d %d ", out[k].r, out[k].i);printf("\n");*/
  
  
      free(in);
      free(out);
      clt_mdct_clear(&cfg);
  }
  
  int main(int argc,char ** argv)
  {
      ALLOC_STACK;
      if (argc>1) {
          int k;
          for (k=1;k<argc;++k) {
              test1d(atoi(argv[k]),0);
              test1d(atoi(argv[k]),1);
          }
      }else{
          test1d(32,0);
          test1d(32,1);
          test1d(256,0);
          test1d(256,1);
          test1d(512,0);
          test1d(512,1);
  #ifndef RADIX_TWO_ONLY
          test1d(40,0);
          test1d(40,1);
          test1d(56,0);
          test1d(56,1);
          test1d(120,0);
          test1d(120,1);
          test1d(240,0);
          test1d(240,1);
          test1d(480,0);
          test1d(480,1);
  #endif
      }
      return ret;
  }
  