media/libtremor/lib/tremor_window.c
author Gregory Szorc <gps@mozilla.com>
Thu, 19 Feb 2015 10:58:41 -0800
changeset 245738 c97c977c92b97c9585011651b13a088f0cd4ed4f
parent 56070 d3fac77dac2683da42207db50e16484512a137d4
permissions -rw-r--r--
Bug 1132771 - moz.build fixups to enable execution in no config mode Various moz.build files fail to execute when a build config is not present. Many of these are due to assuming certain CONFIG entries are present. This patch attempts to fix that and enable every moz.build to be read without a build config.

/********************************************************************
 *                                                                  *
 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' 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 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
 *                                                                  *
 ********************************************************************

 function: window functions

 ********************************************************************/

#include <stdlib.h>
#include <math.h>
#include "misc.h"
#include "window.h"
#include "window_lookup.h"

const void *_vorbis_window(int type, int left){

  switch(type){
  case 0:

    switch(left){
    case 32:
      return vwin64;
    case 64:
      return vwin128;
    case 128:
      return vwin256;
    case 256:
      return vwin512;
    case 512:
      return vwin1024;
    case 1024:
      return vwin2048;
    case 2048:
      return vwin4096;
    case 4096:
      return vwin8192;
    default:
      return(0);
    }
    break;
  default:
    return(0);
  }
}

void _vorbis_apply_window(ogg_int32_t *d,const void *window_p[2],
			  long *blocksizes,
			  int lW,int W,int nW){
  
  LOOKUP_T *window[2]={window_p[0],window_p[1]};
  long n=blocksizes[W];
  long ln=blocksizes[lW];
  long rn=blocksizes[nW];

  long leftbegin=n/4-ln/4;
  long leftend=leftbegin+ln/2;

  long rightbegin=n/2+n/4-rn/4;
  long rightend=rightbegin+rn/2;
  
  int i,p;

  for(i=0;i<leftbegin;i++)
    d[i]=0;

  for(p=0;i<leftend;i++,p++)
    d[i]=MULT31(d[i],window[lW][p]);

  for(i=rightbegin,p=rn/2-1;i<rightend;i++,p--)
    d[i]=MULT31(d[i],window[nW][p]);

  for(;i<n;i++)
    d[i]=0;
}