release/src/router/libvorbis/test/util.c

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
   4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   7  *                                                                  *
   8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
   9  * by the Xiph.Org Foundation http://www.xiph.org/                  *
  10  *                                                                  *
  11  ********************************************************************
  12
  13  function: utility functions for vorbis codec test suite.
  14  last mod: $Id: util.c 13293 2007-07-24 00:09:47Z erikd $
  15
  16  ********************************************************************/
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <math.h>
  21 #include <string.h>
  22 #include <errno.h>
  23
  24 #include <vorbis/codec.h>
  25 #include <vorbis/vorbisenc.h>
  26
  27 #include "util.h"
  28
  29 void
  30 gen_windowed_sine (float *data, int len, float maximum)
  31 {    int k ;
  32
  33     memset (data, 0, len * sizeof (float)) ;
  34
  35     len /= 2 ;
  36
  37     for (k = 0 ; k < len ; k++)
  38     {    data [k] = sin (2.0 * k * M_PI * 1.0 / 32.0 + 0.4) ;
  39
  40         /* Apply Hanning Window. */
  41         data [k] *= maximum * (0.5 - 0.5 * cos (2.0 * M_PI * k / ((len) - 1))) ;
  42         }
  43
  44     return ;
  45 }
  46
  47 void
  48 set_data_in (float * data, unsigned len, float value)
  49 {        unsigned k ;
  50
  51         for (k = 0 ; k < len ; k++)
  52                 data [k] = value ;
  53 }