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Viewing changes to tremor/window.c

  • Committer: Reinhard Tartler
  • Date: 2006-07-08 08:45:33 UTC
  • Revision ID: siretart@tauware.de-20060708084533-dbc155bde7122e78
imported mplayer_0.99+1.0pre7try2+cvs20060117

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tremor/window.c
 
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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 "os.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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}