cannam@86: /********************************************************************
cannam@86:  *                                                                  *
cannam@86:  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
cannam@86:  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
cannam@86:  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
cannam@86:  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
cannam@86:  *                                                                  *
cannam@86:  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
cannam@86:  * by the Xiph.Org Foundation http://www.xiph.org/                  *
cannam@86:  *                                                                  *
cannam@86:  ********************************************************************
cannam@86: 
cannam@86:  function: utility functions for vorbis codec test suite.
cannam@86:  last mod: $Id: util.c 13293 2007-07-24 00:09:47Z erikd $
cannam@86: 
cannam@86:  ********************************************************************/
cannam@86: 
cannam@86: #include <stdio.h>
cannam@86: #include <stdlib.h>
cannam@86: #include <math.h>
cannam@86: #include <string.h>
cannam@86: #include <errno.h>
cannam@86: 
cannam@86: #include <vorbis/codec.h>
cannam@86: #include <vorbis/vorbisenc.h>
cannam@86: 
cannam@86: #include "util.h"
cannam@86: 
cannam@86: void
cannam@86: gen_windowed_sine (float *data, int len, float maximum)
cannam@86: {    int k ;
cannam@86: 
cannam@86:     memset (data, 0, len * sizeof (float)) ;
cannam@86: 
cannam@86:     len /= 2 ;
cannam@86: 
cannam@86:     for (k = 0 ; k < len ; k++)
cannam@86:     {    data [k] = sin (2.0 * k * M_PI * 1.0 / 32.0 + 0.4) ;
cannam@86: 
cannam@86:         /* Apply Hanning Window. */
cannam@86:         data [k] *= maximum * (0.5 - 0.5 * cos (2.0 * M_PI * k / ((len) - 1))) ;
cannam@86:         }
cannam@86: 
cannam@86:     return ;
cannam@86: }
cannam@86: 
cannam@86: void
cannam@86: set_data_in (float * data, unsigned len, float value)
cannam@86: {        unsigned k ;
cannam@86: 
cannam@86:         for (k = 0 ; k < len ; k++)
cannam@86:                 data [k] = value ;
cannam@86: }