📄 mdct.h
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/******************************************************************** * * * 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 1994-2002 * * by the XIPHOPHORUS Company http://www.xiph.org/ * * * ******************************************************************** function: modified discrete cosine transform prototypes last mod: $Id: mdct.h,v 1.20 2002/01/22 11:59:00 xiphmont Exp $ ********************************************************************/#ifndef _OGG_mdct_H_#define _OGG_mdct_H_#include "vorbis_codec.h"typedef struct { int n; int log2n; FIXP *trig; int *bitrev; FIXP scale;} mdct_lookup;extern void mdct_init(mdct_lookup *lookup,int n);extern void mdct_clear(mdct_lookup *l);extern void mdct_backward(mdct_lookup *init, FIXP *in, FIXP *out);#endif
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