diff options
Diffstat (limited to 'vorbis/lib/lookup.c')
-rw-r--r-- | vorbis/lib/lookup.c | 93 |
1 files changed, 0 insertions, 93 deletions
diff --git a/vorbis/lib/lookup.c b/vorbis/lib/lookup.c deleted file mode 100644 index 1cc1f88..0000000 --- a/vorbis/lib/lookup.c +++ /dev/null @@ -1,93 +0,0 @@ -/******************************************************************** - * * - * THIS FILE IS PART OF THE OggVorbis SOFTWARE 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 SOURCE CODE IS (C) COPYRIGHT 1994-2009 * - * by the Xiph.Org Foundation http://www.xiph.org/ * - * * - ******************************************************************** - - function: lookup based functions - - ********************************************************************/ - -#include <math.h> -#include "lookup.h" -#include "lookup_data.h" -#include "os.h" -#include "misc.h" - -#ifdef FLOAT_LOOKUP - -/* interpolated lookup based cos function, domain 0 to PI only */ -float vorbis_coslook(float a){ - double d=a*(.31830989*(float)COS_LOOKUP_SZ); - int i=vorbis_ftoi(d-.5); - - return COS_LOOKUP[i]+ (d-i)*(COS_LOOKUP[i+1]-COS_LOOKUP[i]); -} - -/* interpolated 1./sqrt(p) where .5 <= p < 1. */ -float vorbis_invsqlook(float a){ - double d=a*(2.f*(float)INVSQ_LOOKUP_SZ)-(float)INVSQ_LOOKUP_SZ; - int i=vorbis_ftoi(d-.5f); - return INVSQ_LOOKUP[i]+ (d-i)*(INVSQ_LOOKUP[i+1]-INVSQ_LOOKUP[i]); -} - -/* interpolated 1./sqrt(p) where .5 <= p < 1. */ -float vorbis_invsq2explook(int a){ - return INVSQ2EXP_LOOKUP[a-INVSQ2EXP_LOOKUP_MIN]; -} - -#include <stdio.h> -/* interpolated lookup based fromdB function, domain -140dB to 0dB only */ -float vorbis_fromdBlook(float a){ - int i=vorbis_ftoi(a*((float)(-(1<<FROMdB2_SHIFT)))-.5f); - return (i<0)?1.f: - ((i>=(FROMdB_LOOKUP_SZ<<FROMdB_SHIFT))?0.f: - FROMdB_LOOKUP[i>>FROMdB_SHIFT]*FROMdB2_LOOKUP[i&FROMdB2_MASK]); -} - -#endif - -#ifdef INT_LOOKUP -/* interpolated 1./sqrt(p) where .5 <= a < 1. (.100000... to .111111...) in - 16.16 format - - returns in m.8 format */ -long vorbis_invsqlook_i(long a,long e){ - long i=(a&0x7fff)>>(INVSQ_LOOKUP_I_SHIFT-1); - long d=(a&INVSQ_LOOKUP_I_MASK)<<(16-INVSQ_LOOKUP_I_SHIFT); /* 0.16 */ - long val=INVSQ_LOOKUP_I[i]- /* 1.16 */ - (((INVSQ_LOOKUP_I[i]-INVSQ_LOOKUP_I[i+1])* /* 0.16 */ - d)>>16); /* result 1.16 */ - - e+=32; - if(e&1)val=(val*5792)>>13; /* multiply val by 1/sqrt(2) */ - e=(e>>1)-8; - - return(val>>e); -} - -/* interpolated lookup based fromdB function, domain -140dB to 0dB only */ -/* a is in n.12 format */ -float vorbis_fromdBlook_i(long a){ - int i=(-a)>>(12-FROMdB2_SHIFT); - return (i<0)?1.f: - ((i>=(FROMdB_LOOKUP_SZ<<FROMdB_SHIFT))?0.f: - FROMdB_LOOKUP[i>>FROMdB_SHIFT]*FROMdB2_LOOKUP[i&FROMdB2_MASK]); -} - -/* interpolated lookup based cos function, domain 0 to PI only */ -/* a is in 0.16 format, where 0==0, 2^^16-1==PI, return 0.14 */ -long vorbis_coslook_i(long a){ - int i=a>>COS_LOOKUP_I_SHIFT; - int d=a&COS_LOOKUP_I_MASK; - return COS_LOOKUP_I[i]- ((d*(COS_LOOKUP_I[i]-COS_LOOKUP_I[i+1]))>> - COS_LOOKUP_I_SHIFT); -} - -#endif |