1 /******************************************************************** 2 * * 3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * 4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * 5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * 6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * 7 * * 8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007 * 9 * by the Xiph.Org Foundation http://www.xiph.org/ * 10 * * 11 ******************************************************************** 12 13 function: utility functions for vorbis codec test suite. 14 last mod: $Id: util.c 13293 2007-07-24 00:09:47Z erikd $ 15 16 ********************************************************************/ 17 18 #include <stdio.h> 19 #include <stdlib.h> 20 #include <math.h> 21 #include <string.h> 22 #include <errno.h> 23 24 #include <vorbis/codec.h> 25 #include <vorbis/vorbisenc.h> 26 27 #include "util.h" 28 29 void 30 gen_windowed_sine (float *data, int len, float maximum) 31 { int k ; 32 33 memset (data, 0, len * sizeof (float)) ; 34 35 len /= 2 ; 36 37 for (k = 0 ; k < len ; k++) 38 { data [k] = sin (2.0 * k * M_PI * 1.0 / 32.0 + 0.4) ; 39 40 /* Apply Hanning Window. */ 41 data [k] *= maximum * (0.5 - 0.5 * cos (2.0 * M_PI * k / ((len) - 1))) ; 42 } 43 44 return ; 45 } 46 47 void 48 set_data_in (float * data, unsigned len, float value) 49 { unsigned k ; 50 51 for (k = 0 ; k < len ; k++) 52 data [k] = value ; 53 } 54
