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