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