53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/********************************************************************
|
|
* *
|
|
* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
|
|
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
|
|
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
|
|
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
|
|
* *
|
|
* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007 *
|
|
* by the Xiph.Org Foundation http://www.xiph.org/ *
|
|
* *
|
|
********************************************************************
|
|
|
|
function: utility functions for vorbis codec test suite.
|
|
|
|
********************************************************************/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <math.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
|
|
#include <vorbis/codec.h>
|
|
#include <vorbis/vorbisenc.h>
|
|
|
|
#include "util.h"
|
|
|
|
void
|
|
gen_windowed_sine (float *data, int len, float maximum)
|
|
{ int k ;
|
|
|
|
memset (data, 0, len * sizeof (float)) ;
|
|
|
|
len /= 2 ;
|
|
|
|
for (k = 0 ; k < len ; k++)
|
|
{ data [k] = sin (2.0 * k * M_PI * 1.0 / 32.0 + 0.4) ;
|
|
|
|
/* Apply Hanning Window. */
|
|
data [k] *= maximum * (0.5 - 0.5 * cos (2.0 * M_PI * k / ((len) - 1))) ;
|
|
}
|
|
|
|
return ;
|
|
}
|
|
|
|
void
|
|
set_data_in (float * data, unsigned len, float value)
|
|
{ unsigned k ;
|
|
|
|
for (k = 0 ; k < len ; k++)
|
|
data [k] = value ;
|
|
}
|