25046aac17
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12902 a1c6a512-1295-4272-9138-f99709370657
78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/********************************************************************
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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 "config-tremor.h"
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#include <string.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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memset((void *)&d[0], 0, sizeof(ogg_int32_t)*leftbegin);
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/* mcf5249_vect_zero(&d[0], leftbegin); */
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vect_mult_fw(&d[leftbegin], &window[lW][0], leftend-leftbegin);
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vect_mult_bw(&d[rightbegin], &window[nW][rn/2-1], rightend-rightbegin);
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memset((void *)&d[rightend], 0, sizeof(ogg_int32_t)*(n-rightend));
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/* mcf5249_vect_zero(&d[rightend], n-rightend); */
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}
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