func: static av_cold void init_atrac3_transforms(ATRAC3Context *q) {
  
      float enc_window[256];
  
      int i;
  
  
  
      /* Generate the mdct window, for details see
  
       * http://wiki.multimedia.cx/index.php?title=RealAudio_atrc#Windows */
  
      for (i=0 ; i<256; i++)
  
          enc_window[i] = (sin(((i + 0.5) / 256.0 - 0.5) * M_PI) + 1.0) * 0.5;
  
  
  
      if (!mdct_window[0])
  
          for (i=0 ; i<256; i++) {
  
              mdct_window[i] = enc_window[i]/(enc_window[i]*enc_window[i] + enc_window[255-i]*enc_window[255-i]);
  
              mdct_window[511-i] = mdct_window[i];
  
          }
  
  
  
      /* Initialize the MDCT transform. */
  
      ff_mdct_init(&mdct_ctx, 9, 1, 1.0);
  
  }
  