misc/libtremor/tremor/window.c
author koda
Fri, 09 Nov 2012 23:11:53 +0100
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/********************************************************************
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 *                                                                  *
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 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
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 *                                                                  *
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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 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
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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: window functions
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 ********************************************************************/
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#include <stdlib.h>
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#include <math.h>
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#include "misc.h"
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#include "window.h"
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#include "window_lookup.h"
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const void *_vorbis_window(int type, int left){
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  switch(type){
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  case 0:
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    switch(left){
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    case 32:
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      return vwin64;
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    case 64:
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      return vwin128;
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    case 128:
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      return vwin256;
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    case 256:
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      return vwin512;
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    case 512:
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      return vwin1024;
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    case 1024:
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      return vwin2048;
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    case 2048:
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      return vwin4096;
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    case 4096:
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      return vwin8192;
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    default:
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      return(0);
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    }
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    break;
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  default:
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    return(0);
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  }
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}
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void _vorbis_apply_window(ogg_int32_t *d,const void *window_p[2],
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			  long *blocksizes,
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			  int lW,int W,int nW){
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  LOOKUP_T *window[2]={window_p[0],window_p[1]};
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  long n=blocksizes[W];
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  long ln=blocksizes[lW];
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  long rn=blocksizes[nW];
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  long leftbegin=n/4-ln/4;
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  long leftend=leftbegin+ln/2;
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  long rightbegin=n/2+n/4-rn/4;
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  long rightend=rightbegin+rn/2;
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  int i,p;
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  for(i=0;i<leftbegin;i++)
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    d[i]=0;
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  for(p=0;i<leftend;i++,p++)
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    d[i]=MULT31(d[i],window[lW][p]);
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  for(i=rightbegin,p=rn/2-1;i<rightend;i++,p--)
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    d[i]=MULT31(d[i],window[nW][p]);
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  for(;i<n;i++)
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    d[i]=0;
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}