author | nemo |
Fri, 12 Aug 2011 12:42:50 -0400 | |
changeset 5551 | 0897b947e7a0 |
parent 5170 | f7e49eff3708 |
permissions | -rw-r--r-- |
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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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|
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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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|
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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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} |