/******************************************************************** * * * 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 #include #include #include #include #include #include #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 ; }