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initial commit. This is icculus version 5542b94cae02a6333845854bbbd1abe0a259f1a4

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fgenesis 2011-08-03 22:05:33 +02:00
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ExternalLibs/libvorbis-1.3.1/test/util.c Normal file
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/********************************************************************
* *
* 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.
last mod: $Id: util.c 13293 2007-07-24 00:09:47Z erikd $
********************************************************************/
#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 ;
}