412cdd6cf7
Use the windowing approach from ffmpeg in tremor, does the mdct doubling, windowing and overlap add in one go. Also uses less memory so all the processing buffers fit in iram on targets with small iram for the common blocksizes (256/2048) now. Speeds up decoding of vorbis files by 3MHz for 256/2048 and 20MHz for 512/4096 files on h300. Speeds up decoding of vorbis files by 3MHz for 256/2048 and 4.5MHz for 512/4096 on the beast. Speeds up decoding of vorbis files by 0.3MHz for 256/2048 and 1MHz for 512/4096 on c200v1. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30580 a1c6a512-1295-4272-9138-f99709370657
82 lines
2.5 KiB
C
82 lines
2.5 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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#if 0
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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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/* Following memset is not required - we are careful to only overlap/add the
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regions that geniunely overlap in the window region, and the portions
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outside that region are not added (so don't need to be zerod). see block.c
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memset((void *)&d[0], 0, sizeof(ogg_int32_t)*leftbegin); */
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ogg_vect_mult_fw(&d[leftbegin], &window[lW][0], leftend-leftbegin);
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ogg_vect_mult_bw(&d[rightbegin], &window[nW][rn/2-1], rightend-rightbegin);
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/* Again - memset not needed
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memset((void *)&d[rightend], 0, sizeof(ogg_int32_t)*(n-rightend)); */
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}
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#endif
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