misc/libtremor/mdct.c
author nemo
Mon, 15 Aug 2011 16:49:15 -0400
changeset 5578 153e32989646
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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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 function: normalized modified discrete cosine transform
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           power of two length transform only [64 <= n ]
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 last mod: $Id: mdct.c,v 1.9 2002/10/16 09:17:39 xiphmont Exp $
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 Original algorithm adapted long ago from _The use of multirate filter
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 banks for coding of high quality digital audio_, by T. Sporer,
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 K. Brandenburg and B. Edler, collection of the European Signal
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 Processing Conference (EUSIPCO), Amsterdam, June 1992, Vol.1, pp
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 211-214
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 The below code implements an algorithm that no longer looks much like
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 that presented in the paper, but the basic structure remains if you
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 dig deep enough to see it.
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 This module DOES NOT INCLUDE code to generate/apply the window
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 function.  Everybody has their own weird favorite including me... I
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 happen to like the properties of y=sin(.5PI*sin^2(x)), but others may
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 vehemently disagree.
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 ********************************************************************/
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#include "ivorbiscodec.h"
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#include "codebook.h"
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#include "misc.h"
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#include "mdct.h"
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#include "mdct_lookup.h"
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/* 8 point butterfly (in place) */
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STIN void mdct_butterfly_8(DATA_TYPE *x){
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  REG_TYPE r0   = x[4] + x[0];
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  REG_TYPE r1   = x[4] - x[0];
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  REG_TYPE r2   = x[5] + x[1];
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  REG_TYPE r3   = x[5] - x[1];
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  REG_TYPE r4   = x[6] + x[2];
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  REG_TYPE r5   = x[6] - x[2];
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  REG_TYPE r6   = x[7] + x[3];
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  REG_TYPE r7   = x[7] - x[3];
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	   x[0] = r5   + r3;
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	   x[1] = r7   - r1;
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	   x[2] = r5   - r3;
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	   x[3] = r7   + r1;
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           x[4] = r4   - r0;
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	   x[5] = r6   - r2;
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           x[6] = r4   + r0;
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	   x[7] = r6   + r2;
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	   MB();
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}
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/* 16 point butterfly (in place, 4 register) */
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STIN void mdct_butterfly_16(DATA_TYPE *x){
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  REG_TYPE r0, r1;
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	   r0 = x[ 0] - x[ 8]; x[ 8] += x[ 0];
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	   r1 = x[ 1] - x[ 9]; x[ 9] += x[ 1];
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	   x[ 0] = MULT31((r0 + r1) , cPI2_8);
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	   x[ 1] = MULT31((r1 - r0) , cPI2_8);
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	   MB();
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	   r0 = x[10] - x[ 2]; x[10] += x[ 2];
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	   r1 = x[ 3] - x[11]; x[11] += x[ 3];
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	   x[ 2] = r1; x[ 3] = r0;
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	   MB();
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	   r0 = x[12] - x[ 4]; x[12] += x[ 4];
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	   r1 = x[13] - x[ 5]; x[13] += x[ 5];
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	   x[ 4] = MULT31((r0 - r1) , cPI2_8);
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	   x[ 5] = MULT31((r0 + r1) , cPI2_8);
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	   MB();
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	   r0 = x[14] - x[ 6]; x[14] += x[ 6];
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	   r1 = x[15] - x[ 7]; x[15] += x[ 7];
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	   x[ 6] = r0; x[ 7] = r1;
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	   MB();
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	   mdct_butterfly_8(x);
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	   mdct_butterfly_8(x+8);
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}
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/* 32 point butterfly (in place, 4 register) */
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STIN void mdct_butterfly_32(DATA_TYPE *x){
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  REG_TYPE r0, r1;
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	   r0 = x[30] - x[14]; x[30] += x[14];           
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	   r1 = x[31] - x[15]; x[31] += x[15];
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	   x[14] = r0; x[15] = r1;
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	   MB();
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	   r0 = x[28] - x[12]; x[28] += x[12];           
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	   r1 = x[29] - x[13]; x[29] += x[13];
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	   XNPROD31( r0, r1, cPI1_8, cPI3_8, &x[12], &x[13] );
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	   MB();
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	   r0 = x[26] - x[10]; x[26] += x[10];
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	   r1 = x[27] - x[11]; x[27] += x[11];
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	   x[10] = MULT31((r0 - r1) , cPI2_8);
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	   x[11] = MULT31((r0 + r1) , cPI2_8);
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	   MB();
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	   r0 = x[24] - x[ 8]; x[24] += x[ 8];
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	   r1 = x[25] - x[ 9]; x[25] += x[ 9];
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	   XNPROD31( r0, r1, cPI3_8, cPI1_8, &x[ 8], &x[ 9] );
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	   MB();
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	   r0 = x[22] - x[ 6]; x[22] += x[ 6];
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	   r1 = x[ 7] - x[23]; x[23] += x[ 7];
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	   x[ 6] = r1; x[ 7] = r0;
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	   MB();
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	   r0 = x[ 4] - x[20]; x[20] += x[ 4];
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	   r1 = x[ 5] - x[21]; x[21] += x[ 5];
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	   XPROD31 ( r0, r1, cPI3_8, cPI1_8, &x[ 4], &x[ 5] );
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	   MB();
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	   r0 = x[ 2] - x[18]; x[18] += x[ 2];
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	   r1 = x[ 3] - x[19]; x[19] += x[ 3];
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	   x[ 2] = MULT31((r1 + r0) , cPI2_8);
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	   x[ 3] = MULT31((r1 - r0) , cPI2_8);
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	   MB();
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	   r0 = x[ 0] - x[16]; x[16] += x[ 0];
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	   r1 = x[ 1] - x[17]; x[17] += x[ 1];
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	   XPROD31 ( r0, r1, cPI1_8, cPI3_8, &x[ 0], &x[ 1] );
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	   MB();
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   142
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	   mdct_butterfly_16(x);
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	   mdct_butterfly_16(x+16);
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}
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/* N/stage point generic N stage butterfly (in place, 2 register) */
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STIN void mdct_butterfly_generic(DATA_TYPE *x,int points,int step){
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   149
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  LOOKUP_T *T   = sincos_lookup0;
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  DATA_TYPE *x1        = x + points      - 8;
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  DATA_TYPE *x2        = x + (points>>1) - 8;
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  REG_TYPE   r0;
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  REG_TYPE   r1;
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   155
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  do{
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    r0 = x1[6] - x2[6]; x1[6] += x2[6];
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    r1 = x2[7] - x1[7]; x1[7] += x2[7];
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    XPROD31( r1, r0, T[0], T[1], &x2[6], &x2[7] ); T+=step;
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    r0 = x1[4] - x2[4]; x1[4] += x2[4];
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    r1 = x2[5] - x1[5]; x1[5] += x2[5];
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    XPROD31( r1, r0, T[0], T[1], &x2[4], &x2[5] ); T+=step;
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   164
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    r0 = x1[2] - x2[2]; x1[2] += x2[2];
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    r1 = x2[3] - x1[3]; x1[3] += x2[3];
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    XPROD31( r1, r0, T[0], T[1], &x2[2], &x2[3] ); T+=step;
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    r0 = x1[0] - x2[0]; x1[0] += x2[0];
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    r1 = x2[1] - x1[1]; x1[1] += x2[1];
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    XPROD31( r1, r0, T[0], T[1], &x2[0], &x2[1] ); T+=step;
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    x1-=8; x2-=8;
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  }while(T<sincos_lookup0+1024);
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  do{
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    r0 = x1[6] - x2[6]; x1[6] += x2[6];
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    r1 = x1[7] - x2[7]; x1[7] += x2[7];
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    XNPROD31( r0, r1, T[0], T[1], &x2[6], &x2[7] ); T-=step;
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    r0 = x1[4] - x2[4]; x1[4] += x2[4];
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    r1 = x1[5] - x2[5]; x1[5] += x2[5];
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    XNPROD31( r0, r1, T[0], T[1], &x2[4], &x2[5] ); T-=step;
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    r0 = x1[2] - x2[2]; x1[2] += x2[2];
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    r1 = x1[3] - x2[3]; x1[3] += x2[3];
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    XNPROD31( r0, r1, T[0], T[1], &x2[2], &x2[3] ); T-=step;
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    r0 = x1[0] - x2[0]; x1[0] += x2[0];
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    r1 = x1[1] - x2[1]; x1[1] += x2[1];
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    XNPROD31( r0, r1, T[0], T[1], &x2[0], &x2[1] ); T-=step;
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    x1-=8; x2-=8;
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  }while(T>sincos_lookup0);
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  do{
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    r0 = x2[6] - x1[6]; x1[6] += x2[6];
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    r1 = x2[7] - x1[7]; x1[7] += x2[7];
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    XPROD31( r0, r1, T[0], T[1], &x2[6], &x2[7] ); T+=step;
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   198
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    r0 = x2[4] - x1[4]; x1[4] += x2[4];
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    r1 = x2[5] - x1[5]; x1[5] += x2[5];
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    XPROD31( r0, r1, T[0], T[1], &x2[4], &x2[5] ); T+=step;
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    r0 = x2[2] - x1[2]; x1[2] += x2[2];
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    r1 = x2[3] - x1[3]; x1[3] += x2[3];
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    XPROD31( r0, r1, T[0], T[1], &x2[2], &x2[3] ); T+=step;
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    r0 = x2[0] - x1[0]; x1[0] += x2[0];
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    r1 = x2[1] - x1[1]; x1[1] += x2[1];
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    XPROD31( r0, r1, T[0], T[1], &x2[0], &x2[1] ); T+=step;
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    x1-=8; x2-=8;
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  }while(T<sincos_lookup0+1024);
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  do{
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    r0 = x1[6] - x2[6]; x1[6] += x2[6];
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    r1 = x2[7] - x1[7]; x1[7] += x2[7];
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    XNPROD31( r1, r0, T[0], T[1], &x2[6], &x2[7] ); T-=step;
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    r0 = x1[4] - x2[4]; x1[4] += x2[4];
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    r1 = x2[5] - x1[5]; x1[5] += x2[5];
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    XNPROD31( r1, r0, T[0], T[1], &x2[4], &x2[5] ); T-=step;
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    r0 = x1[2] - x2[2]; x1[2] += x2[2];
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    r1 = x2[3] - x1[3]; x1[3] += x2[3];
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    XNPROD31( r1, r0, T[0], T[1], &x2[2], &x2[3] ); T-=step;
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    r0 = x1[0] - x2[0]; x1[0] += x2[0];
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    r1 = x2[1] - x1[1]; x1[1] += x2[1];
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    XNPROD31( r1, r0, T[0], T[1], &x2[0], &x2[1] ); T-=step;
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    x1-=8; x2-=8;
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  }while(T>sincos_lookup0);
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}
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STIN void mdct_butterflies(DATA_TYPE *x,int points,int shift){
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  int stages=8-shift;
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  int i,j;
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  for(i=0;--stages>0;i++){
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    for(j=0;j<(1<<i);j++)
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      mdct_butterfly_generic(x+(points>>i)*j,points>>i,4<<(i+shift));
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  }
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  for(j=0;j<points;j+=32)
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    mdct_butterfly_32(x+j);
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}
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static unsigned char bitrev[16]={0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15};
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STIN int bitrev12(int x){
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  return bitrev[x>>8]|(bitrev[(x&0x0f0)>>4]<<4)|(((int)bitrev[x&0x00f])<<8);
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}
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STIN void mdct_bitreverse(DATA_TYPE *x,int n,int step,int shift){
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  int          bit   = 0;
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  DATA_TYPE   *w0    = x;
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  DATA_TYPE   *w1    = x = w0+(n>>1);
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  LOOKUP_T    *T = (step>=4)?(sincos_lookup0+(step>>1)):sincos_lookup1;
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  LOOKUP_T    *Ttop  = T+1024;
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  DATA_TYPE    r2;
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   263
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  do{
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    DATA_TYPE r3     = bitrev12(bit++);
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    DATA_TYPE *x0    = x + ((r3 ^ 0xfff)>>shift) -1;
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    DATA_TYPE *x1    = x + (r3>>shift);
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    REG_TYPE  r0     = x0[0]  + x1[0];
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    REG_TYPE  r1     = x1[1]  - x0[1];
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	      XPROD32( r0, r1, T[1], T[0], &r2, &r3 ); T+=step;
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	      w1    -= 4;
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	      r0     = (x0[1] + x1[1])>>1;
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              r1     = (x0[0] - x1[0])>>1;
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	      w0[0]  = r0     + r2;
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	      w0[1]  = r1     + r3;
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	      w1[2]  = r0     - r2;
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	      w1[3]  = r3     - r1;
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	      r3     = bitrev12(bit++);
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              x0     = x + ((r3 ^ 0xfff)>>shift) -1;
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              x1     = x + (r3>>shift);
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   286
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              r0     = x0[0]  + x1[0];
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              r1     = x1[1]  - x0[1];
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	      XPROD32( r0, r1, T[1], T[0], &r2, &r3 ); T+=step;
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              r0     = (x0[1] + x1[1])>>1;
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              r1     = (x0[0] - x1[0])>>1;
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	      w0[2]  = r0     + r2;
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	      w0[3]  = r1     + r3;
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	      w1[0]  = r0     - r2;
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	      w1[1]  = r3     - r1;
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   298
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	      w0    += 4;
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  }while(T<Ttop);
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  do{
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    DATA_TYPE r3     = bitrev12(bit++);
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    DATA_TYPE *x0    = x + ((r3 ^ 0xfff)>>shift) -1;
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    DATA_TYPE *x1    = x + (r3>>shift);
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   305
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    REG_TYPE  r0     = x0[0]  + x1[0];
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    REG_TYPE  r1     = x1[1]  - x0[1];
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   308
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	      T-=step; XPROD32( r0, r1, T[0], T[1], &r2, &r3 );
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   310
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	      w1    -= 4;
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   312
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	      r0     = (x0[1] + x1[1])>>1;
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              r1     = (x0[0] - x1[0])>>1;
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   315
	      w0[0]  = r0     + r2;
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   316
	      w0[1]  = r1     + r3;
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   317
	      w1[2]  = r0     - r2;
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   318
	      w1[3]  = r3     - r1;
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   319
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	      r3     = bitrev12(bit++);
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   321
              x0     = x + ((r3 ^ 0xfff)>>shift) -1;
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              x1     = x + (r3>>shift);
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   323
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   324
              r0     = x0[0]  + x1[0];
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   325
              r1     = x1[1]  - x0[1];
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   326
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   327
	      T-=step; XPROD32( r0, r1, T[0], T[1], &r2, &r3 );
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   328
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   329
              r0     = (x0[1] + x1[1])>>1;
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   330
              r1     = (x0[0] - x1[0])>>1;
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   331
	      w0[2]  = r0     + r2;
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   332
	      w0[3]  = r1     + r3;
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   333
	      w1[0]  = r0     - r2;
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   334
	      w1[1]  = r3     - r1;
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   335
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   336
	      w0    += 4;
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   337
  }while(w0<w1);
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   338
}
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   339
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   340
void mdct_backward(int n, DATA_TYPE *in, DATA_TYPE *out){
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   341
  int n2=n>>1;
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   342
  int n4=n>>2;
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   343
  DATA_TYPE *iX;
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   344
  DATA_TYPE *oX;
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   345
  LOOKUP_T *T;
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   346
  LOOKUP_T *V;
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   347
  int shift;
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   348
  int step;
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   349
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   350
  for (shift=6;!(n&(1<<shift));shift++);
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   351
  shift=13-shift;
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   352
  step=2<<shift;
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   353
   
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   354
  /* rotate */
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   355
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   356
  iX            = in+n2-7;
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   357
  oX            = out+n2+n4;
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   358
  T             = sincos_lookup0;
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diff changeset
   359
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diff changeset
   360
  do{
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diff changeset
   361
    oX-=4;
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diff changeset
   362
    XPROD31( iX[4], iX[6], T[0], T[1], &oX[2], &oX[3] ); T+=step;
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   363
    XPROD31( iX[0], iX[2], T[0], T[1], &oX[0], &oX[1] ); T+=step;
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diff changeset
   364
    iX-=8;
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diff changeset
   365
  }while(iX>=in+n4);
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diff changeset
   366
  do{
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diff changeset
   367
    oX-=4;
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   368
    XPROD31( iX[4], iX[6], T[1], T[0], &oX[2], &oX[3] ); T-=step;
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   369
    XPROD31( iX[0], iX[2], T[1], T[0], &oX[0], &oX[1] ); T-=step;
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   370
    iX-=8;
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diff changeset
   371
  }while(iX>=in);
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diff changeset
   372
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   373
  iX            = in+n2-8;
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diff changeset
   374
  oX            = out+n2+n4;
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   375
  T             = sincos_lookup0;
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diff changeset
   376
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diff changeset
   377
  do{
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diff changeset
   378
    T+=step; XNPROD31( iX[6], iX[4], T[0], T[1], &oX[0], &oX[1] );
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   379
    T+=step; XNPROD31( iX[2], iX[0], T[0], T[1], &oX[2], &oX[3] );
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diff changeset
   380
    iX-=8;
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diff changeset
   381
    oX+=4;
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diff changeset
   382
  }while(iX>=in+n4);
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diff changeset
   383
  do{
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   384
    T-=step; XNPROD31( iX[6], iX[4], T[1], T[0], &oX[0], &oX[1] );
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   385
    T-=step; XNPROD31( iX[2], iX[0], T[1], T[0], &oX[2], &oX[3] );
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   386
    iX-=8;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   387
    oX+=4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   388
  }while(iX>=in);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   389
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   390
  mdct_butterflies(out+n2,n2,shift);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   391
  mdct_bitreverse(out,n,step,shift);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   392
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   393
  /* rotate + window */
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   394
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   395
  step>>=2;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   396
  {
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   397
    DATA_TYPE *oX1=out+n2+n4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   398
    DATA_TYPE *oX2=out+n2+n4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   399
    DATA_TYPE *iX =out;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   400
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   401
    switch(step) {
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   402
      default: {
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   403
        T=(step>=4)?(sincos_lookup0+(step>>1)):sincos_lookup1;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   404
        do{
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   405
          oX1-=4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   406
	  XPROD31( iX[0], -iX[1], T[0], T[1], &oX1[3], &oX2[0] ); T+=step;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   407
	  XPROD31( iX[2], -iX[3], T[0], T[1], &oX1[2], &oX2[1] ); T+=step;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   408
	  XPROD31( iX[4], -iX[5], T[0], T[1], &oX1[1], &oX2[2] ); T+=step;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   409
	  XPROD31( iX[6], -iX[7], T[0], T[1], &oX1[0], &oX2[3] ); T+=step;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   410
	  oX2+=4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   411
	  iX+=8;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   412
	}while(iX<oX1);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   413
	break;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   414
      }
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   415
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   416
      case 1: {
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   417
        /* linear interpolation between table values: offset=0.5, step=1 */
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   418
	REG_TYPE  t0,t1,v0,v1;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   419
        T         = sincos_lookup0;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   420
        V         = sincos_lookup1;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   421
	t0        = (*T++)>>1;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   422
	t1        = (*T++)>>1;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   423
        do{
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   424
          oX1-=4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   425
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   426
	  t0 += (v0 = (*V++)>>1);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   427
	  t1 += (v1 = (*V++)>>1);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   428
	  XPROD31( iX[0], -iX[1], t0, t1, &oX1[3], &oX2[0] );
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   429
	  v0 += (t0 = (*T++)>>1);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   430
	  v1 += (t1 = (*T++)>>1);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   431
	  XPROD31( iX[2], -iX[3], v0, v1, &oX1[2], &oX2[1] );
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   432
	  t0 += (v0 = (*V++)>>1);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   433
	  t1 += (v1 = (*V++)>>1);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   434
	  XPROD31( iX[4], -iX[5], t0, t1, &oX1[1], &oX2[2] );
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   435
	  v0 += (t0 = (*T++)>>1);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   436
	  v1 += (t1 = (*T++)>>1);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   437
	  XPROD31( iX[6], -iX[7], v0, v1, &oX1[0], &oX2[3] );
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   438
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   439
	  oX2+=4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   440
	  iX+=8;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   441
	}while(iX<oX1);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   442
	break;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   443
      }
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   444
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   445
      case 0: {
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   446
        /* linear interpolation between table values: offset=0.25, step=0.5 */
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   447
	REG_TYPE  t0,t1,v0,v1,q0,q1;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   448
        T         = sincos_lookup0;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   449
        V         = sincos_lookup1;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   450
	t0        = *T++;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   451
	t1        = *T++;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   452
        do{
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   453
          oX1-=4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   454
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   455
	  v0  = *V++;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   456
	  v1  = *V++;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   457
	  t0 +=  (q0 = (v0-t0)>>2);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   458
	  t1 +=  (q1 = (v1-t1)>>2);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   459
	  XPROD31( iX[0], -iX[1], t0, t1, &oX1[3], &oX2[0] );
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   460
	  t0  = v0-q0;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   461
	  t1  = v1-q1;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   462
	  XPROD31( iX[2], -iX[3], t0, t1, &oX1[2], &oX2[1] );
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   463
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   464
	  t0  = *T++;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   465
	  t1  = *T++;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   466
	  v0 += (q0 = (t0-v0)>>2);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   467
	  v1 += (q1 = (t1-v1)>>2);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   468
	  XPROD31( iX[4], -iX[5], v0, v1, &oX1[1], &oX2[2] );
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   469
	  v0  = t0-q0;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   470
	  v1  = t1-q1;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   471
	  XPROD31( iX[6], -iX[7], v0, v1, &oX1[0], &oX2[3] );
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   472
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   473
	  oX2+=4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   474
	  iX+=8;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   475
	}while(iX<oX1);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   476
	break;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   477
      }
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   478
    }
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   479
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   480
    iX=out+n2+n4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   481
    oX1=out+n4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   482
    oX2=oX1;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   483
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   484
    do{
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   485
      oX1-=4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   486
      iX-=4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   487
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   488
      oX2[0] = -(oX1[3] = iX[3]);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   489
      oX2[1] = -(oX1[2] = iX[2]);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   490
      oX2[2] = -(oX1[1] = iX[1]);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   491
      oX2[3] = -(oX1[0] = iX[0]);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   492
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   493
      oX2+=4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   494
    }while(oX2<iX);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   495
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   496
    iX=out+n2+n4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   497
    oX1=out+n2+n4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   498
    oX2=out+n2;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   499
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   500
    do{
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   501
      oX1-=4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   502
      oX1[0]= iX[3];
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   503
      oX1[1]= iX[2];
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   504
      oX1[2]= iX[1];
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   505
      oX1[3]= iX[0];
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   506
      iX+=4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   507
    }while(oX1>oX2);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   508
  }
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   509
}
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   510