From 8e94244f86e657e4113e35438e59cf5771882b25 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Sun, 3 Mar 2024 12:51:03 +0100
Subject: libogg and libvorbis are no longer part of this source tree

---
 contrib/vorbis/lib/mdct.c | 562 ----------------------------------------------
 1 file changed, 562 deletions(-)
 delete mode 100644 contrib/vorbis/lib/mdct.c

(limited to 'contrib/vorbis/lib/mdct.c')

diff --git a/contrib/vorbis/lib/mdct.c b/contrib/vorbis/lib/mdct.c
deleted file mode 100644
index f3f1ed8..0000000
--- a/contrib/vorbis/lib/mdct.c
+++ /dev/null
@@ -1,562 +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: normalized modified discrete cosine transform
-           power of two length transform only [64 <= n ]
-
- Original algorithm adapted long ago from _The use of multirate filter
- banks for coding of high quality digital audio_, by T. Sporer,
- K. Brandenburg and B. Edler, collection of the European Signal
- Processing Conference (EUSIPCO), Amsterdam, June 1992, Vol.1, pp
- 211-214
-
- The below code implements an algorithm that no longer looks much like
- that presented in the paper, but the basic structure remains if you
- dig deep enough to see it.
-
- This module DOES NOT INCLUDE code to generate/apply the window
- function.  Everybody has their own weird favorite including me... I
- happen to like the properties of y=sin(.5PI*sin^2(x)), but others may
- vehemently disagree.
-
- ********************************************************************/
-
-/* this can also be run as an integer transform by uncommenting a
-   define in mdct.h; the integerization is a first pass and although
-   it's likely stable for Vorbis, the dynamic range is constrained and
-   roundoff isn't done (so it's noisy).  Consider it functional, but
-   only a starting point.  There's no point on a machine with an FPU */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-#include "vorbis/codec.h"
-#include "mdct.h"
-#include "os.h"
-#include "misc.h"
-
-/* build lookups for trig functions; also pre-figure scaling and
-   some window function algebra. */
-
-void mdct_init(mdct_lookup *lookup,int n){
-  int   *bitrev=_ogg_malloc(sizeof(*bitrev)*(n/4));
-  DATA_TYPE *T=_ogg_malloc(sizeof(*T)*(n+n/4));
-
-  int i;
-  int n2=n>>1;
-  int log2n=lookup->log2n=rint(log((float)n)/log(2.f));
-  lookup->n=n;
-  lookup->trig=T;
-  lookup->bitrev=bitrev;
-
-/* trig lookups... */
-
-  for(i=0;i<n/4;i++){
-    T[i*2]=FLOAT_CONV(cos((M_PI/n)*(4*i)));
-    T[i*2+1]=FLOAT_CONV(-sin((M_PI/n)*(4*i)));
-    T[n2+i*2]=FLOAT_CONV(cos((M_PI/(2*n))*(2*i+1)));
-    T[n2+i*2+1]=FLOAT_CONV(sin((M_PI/(2*n))*(2*i+1)));
-  }
-  for(i=0;i<n/8;i++){
-    T[n+i*2]=FLOAT_CONV(cos((M_PI/n)*(4*i+2))*.5);
-    T[n+i*2+1]=FLOAT_CONV(-sin((M_PI/n)*(4*i+2))*.5);
-  }
-
-  /* bitreverse lookup... */
-
-  {
-    int mask=(1<<(log2n-1))-1,i,j;
-    int msb=1<<(log2n-2);
-    for(i=0;i<n/8;i++){
-      int acc=0;
-      for(j=0;msb>>j;j++)
-        if((msb>>j)&i)acc|=1<<j;
-      bitrev[i*2]=((~acc)&mask)-1;
-      bitrev[i*2+1]=acc;
-
-    }
-  }
-  lookup->scale=FLOAT_CONV(4.f/n);
-}
-
-/* 8 point butterfly (in place, 4 register) */
-STIN void mdct_butterfly_8(DATA_TYPE *x){
-  REG_TYPE r0   = x[6] + x[2];
-  REG_TYPE r1   = x[6] - x[2];
-  REG_TYPE r2   = x[4] + x[0];
-  REG_TYPE r3   = x[4] - x[0];
-
-           x[6] = r0   + r2;
-           x[4] = r0   - r2;
-
-           r0   = x[5] - x[1];
-           r2   = x[7] - x[3];
-           x[0] = r1   + r0;
-           x[2] = r1   - r0;
-
-           r0   = x[5] + x[1];
-           r1   = x[7] + x[3];
-           x[3] = r2   + r3;
-           x[1] = r2   - r3;
-           x[7] = r1   + r0;
-           x[5] = r1   - r0;
-
-}
-
-/* 16 point butterfly (in place, 4 register) */
-STIN void mdct_butterfly_16(DATA_TYPE *x){
-  REG_TYPE r0     = x[1]  - x[9];
-  REG_TYPE r1     = x[0]  - x[8];
-
-           x[8]  += x[0];
-           x[9]  += x[1];
-           x[0]   = MULT_NORM((r0   + r1) * cPI2_8);
-           x[1]   = MULT_NORM((r0   - r1) * cPI2_8);
-
-           r0     = x[3]  - x[11];
-           r1     = x[10] - x[2];
-           x[10] += x[2];
-           x[11] += x[3];
-           x[2]   = r0;
-           x[3]   = r1;
-
-           r0     = x[12] - x[4];
-           r1     = x[13] - x[5];
-           x[12] += x[4];
-           x[13] += x[5];
-           x[4]   = MULT_NORM((r0   - r1) * cPI2_8);
-           x[5]   = MULT_NORM((r0   + r1) * cPI2_8);
-
-           r0     = x[14] - x[6];
-           r1     = x[15] - x[7];
-           x[14] += x[6];
-           x[15] += x[7];
-           x[6]  = r0;
-           x[7]  = r1;
-
-           mdct_butterfly_8(x);
-           mdct_butterfly_8(x+8);
-}
-
-/* 32 point butterfly (in place, 4 register) */
-STIN void mdct_butterfly_32(DATA_TYPE *x){
-  REG_TYPE r0     = x[30] - x[14];
-  REG_TYPE r1     = x[31] - x[15];
-
-           x[30] +=         x[14];
-           x[31] +=         x[15];
-           x[14]  =         r0;
-           x[15]  =         r1;
-
-           r0     = x[28] - x[12];
-           r1     = x[29] - x[13];
-           x[28] +=         x[12];
-           x[29] +=         x[13];
-           x[12]  = MULT_NORM( r0 * cPI1_8  -  r1 * cPI3_8 );
-           x[13]  = MULT_NORM( r0 * cPI3_8  +  r1 * cPI1_8 );
-
-           r0     = x[26] - x[10];
-           r1     = x[27] - x[11];
-           x[26] +=         x[10];
-           x[27] +=         x[11];
-           x[10]  = MULT_NORM(( r0  - r1 ) * cPI2_8);
-           x[11]  = MULT_NORM(( r0  + r1 ) * cPI2_8);
-
-           r0     = x[24] - x[8];
-           r1     = x[25] - x[9];
-           x[24] += x[8];
-           x[25] += x[9];
-           x[8]   = MULT_NORM( r0 * cPI3_8  -  r1 * cPI1_8 );
-           x[9]   = MULT_NORM( r1 * cPI3_8  +  r0 * cPI1_8 );
-
-           r0     = x[22] - x[6];
-           r1     = x[7]  - x[23];
-           x[22] += x[6];
-           x[23] += x[7];
-           x[6]   = r1;
-           x[7]   = r0;
-
-           r0     = x[4]  - x[20];
-           r1     = x[5]  - x[21];
-           x[20] += x[4];
-           x[21] += x[5];
-           x[4]   = MULT_NORM( r1 * cPI1_8  +  r0 * cPI3_8 );
-           x[5]   = MULT_NORM( r1 * cPI3_8  -  r0 * cPI1_8 );
-
-           r0     = x[2]  - x[18];
-           r1     = x[3]  - x[19];
-           x[18] += x[2];
-           x[19] += x[3];
-           x[2]   = MULT_NORM(( r1  + r0 ) * cPI2_8);
-           x[3]   = MULT_NORM(( r1  - r0 ) * cPI2_8);
-
-           r0     = x[0]  - x[16];
-           r1     = x[1]  - x[17];
-           x[16] += x[0];
-           x[17] += x[1];
-           x[0]   = MULT_NORM( r1 * cPI3_8  +  r0 * cPI1_8 );
-           x[1]   = MULT_NORM( r1 * cPI1_8  -  r0 * cPI3_8 );
-
-           mdct_butterfly_16(x);
-           mdct_butterfly_16(x+16);
-
-}
-
-/* N point first stage butterfly (in place, 2 register) */
-STIN void mdct_butterfly_first(DATA_TYPE *T,
-                                        DATA_TYPE *x,
-                                        int points){
-
-  DATA_TYPE *x1        = x          + points      - 8;
-  DATA_TYPE *x2        = x          + (points>>1) - 8;
-  REG_TYPE   r0;
-  REG_TYPE   r1;
-
-  do{
-
-               r0      = x1[6]      -  x2[6];
-               r1      = x1[7]      -  x2[7];
-               x1[6]  += x2[6];
-               x1[7]  += x2[7];
-               x2[6]   = MULT_NORM(r1 * T[1]  +  r0 * T[0]);
-               x2[7]   = MULT_NORM(r1 * T[0]  -  r0 * T[1]);
-
-               r0      = x1[4]      -  x2[4];
-               r1      = x1[5]      -  x2[5];
-               x1[4]  += x2[4];
-               x1[5]  += x2[5];
-               x2[4]   = MULT_NORM(r1 * T[5]  +  r0 * T[4]);
-               x2[5]   = MULT_NORM(r1 * T[4]  -  r0 * T[5]);
-
-               r0      = x1[2]      -  x2[2];
-               r1      = x1[3]      -  x2[3];
-               x1[2]  += x2[2];
-               x1[3]  += x2[3];
-               x2[2]   = MULT_NORM(r1 * T[9]  +  r0 * T[8]);
-               x2[3]   = MULT_NORM(r1 * T[8]  -  r0 * T[9]);
-
-               r0      = x1[0]      -  x2[0];
-               r1      = x1[1]      -  x2[1];
-               x1[0]  += x2[0];
-               x1[1]  += x2[1];
-               x2[0]   = MULT_NORM(r1 * T[13] +  r0 * T[12]);
-               x2[1]   = MULT_NORM(r1 * T[12] -  r0 * T[13]);
-
-    x1-=8;
-    x2-=8;
-    T+=16;
-
-  }while(x2>=x);
-}
-
-/* N/stage point generic N stage butterfly (in place, 2 register) */
-STIN void mdct_butterfly_generic(DATA_TYPE *T,
-                                          DATA_TYPE *x,
-                                          int points,
-                                          int trigint){
-
-  DATA_TYPE *x1        = x          + points      - 8;
-  DATA_TYPE *x2        = x          + (points>>1) - 8;
-  REG_TYPE   r0;
-  REG_TYPE   r1;
-
-  do{
-
-               r0      = x1[6]      -  x2[6];
-               r1      = x1[7]      -  x2[7];
-               x1[6]  += x2[6];
-               x1[7]  += x2[7];
-               x2[6]   = MULT_NORM(r1 * T[1]  +  r0 * T[0]);
-               x2[7]   = MULT_NORM(r1 * T[0]  -  r0 * T[1]);
-
-               T+=trigint;
-
-               r0      = x1[4]      -  x2[4];
-               r1      = x1[5]      -  x2[5];
-               x1[4]  += x2[4];
-               x1[5]  += x2[5];
-               x2[4]   = MULT_NORM(r1 * T[1]  +  r0 * T[0]);
-               x2[5]   = MULT_NORM(r1 * T[0]  -  r0 * T[1]);
-
-               T+=trigint;
-
-               r0      = x1[2]      -  x2[2];
-               r1      = x1[3]      -  x2[3];
-               x1[2]  += x2[2];
-               x1[3]  += x2[3];
-               x2[2]   = MULT_NORM(r1 * T[1]  +  r0 * T[0]);
-               x2[3]   = MULT_NORM(r1 * T[0]  -  r0 * T[1]);
-
-               T+=trigint;
-
-               r0      = x1[0]      -  x2[0];
-               r1      = x1[1]      -  x2[1];
-               x1[0]  += x2[0];
-               x1[1]  += x2[1];
-               x2[0]   = MULT_NORM(r1 * T[1]  +  r0 * T[0]);
-               x2[1]   = MULT_NORM(r1 * T[0]  -  r0 * T[1]);
-
-               T+=trigint;
-    x1-=8;
-    x2-=8;
-
-  }while(x2>=x);
-}
-
-STIN void mdct_butterflies(mdct_lookup *init,
-                             DATA_TYPE *x,
-                             int points){
-
-  DATA_TYPE *T=init->trig;
-  int stages=init->log2n-5;
-  int i,j;
-
-  if(--stages>0){
-    mdct_butterfly_first(T,x,points);
-  }
-
-  for(i=1;--stages>0;i++){
-    for(j=0;j<(1<<i);j++)
-      mdct_butterfly_generic(T,x+(points>>i)*j,points>>i,4<<i);
-  }
-
-  for(j=0;j<points;j+=32)
-    mdct_butterfly_32(x+j);
-
-}
-
-void mdct_clear(mdct_lookup *l){
-  if(l){
-    if(l->trig)_ogg_free(l->trig);
-    if(l->bitrev)_ogg_free(l->bitrev);
-    memset(l,0,sizeof(*l));
-  }
-}
-
-STIN void mdct_bitreverse(mdct_lookup *init,
-                            DATA_TYPE *x){
-  int        n       = init->n;
-  int       *bit     = init->bitrev;
-  DATA_TYPE *w0      = x;
-  DATA_TYPE *w1      = x = w0+(n>>1);
-  DATA_TYPE *T       = init->trig+n;
-
-  do{
-    DATA_TYPE *x0    = x+bit[0];
-    DATA_TYPE *x1    = x+bit[1];
-
-    REG_TYPE  r0     = x0[1]  - x1[1];
-    REG_TYPE  r1     = x0[0]  + x1[0];
-    REG_TYPE  r2     = MULT_NORM(r1     * T[0]   + r0 * T[1]);
-    REG_TYPE  r3     = MULT_NORM(r1     * T[1]   - r0 * T[0]);
-
-              w1    -= 4;
-
-              r0     = HALVE(x0[1] + x1[1]);
-              r1     = HALVE(x0[0] - x1[0]);
-
-              w0[0]  = r0     + r2;
-              w1[2]  = r0     - r2;
-              w0[1]  = r1     + r3;
-              w1[3]  = r3     - r1;
-
-              x0     = x+bit[2];
-              x1     = x+bit[3];
-
-              r0     = x0[1]  - x1[1];
-              r1     = x0[0]  + x1[0];
-              r2     = MULT_NORM(r1     * T[2]   + r0 * T[3]);
-              r3     = MULT_NORM(r1     * T[3]   - r0 * T[2]);
-
-              r0     = HALVE(x0[1] + x1[1]);
-              r1     = HALVE(x0[0] - x1[0]);
-
-              w0[2]  = r0     + r2;
-              w1[0]  = r0     - r2;
-              w0[3]  = r1     + r3;
-              w1[1]  = r3     - r1;
-
-              T     += 4;
-              bit   += 4;
-              w0    += 4;
-
-  }while(w0<w1);
-}
-
-void mdct_backward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out){
-  int n=init->n;
-  int n2=n>>1;
-  int n4=n>>2;
-
-  /* rotate */
-
-  DATA_TYPE *iX = in+n2-7;
-  DATA_TYPE *oX = out+n2+n4;
-  DATA_TYPE *T  = init->trig+n4;
-
-  do{
-    oX         -= 4;
-    oX[0]       = MULT_NORM(-iX[2] * T[3] - iX[0]  * T[2]);
-    oX[1]       = MULT_NORM (iX[0] * T[3] - iX[2]  * T[2]);
-    oX[2]       = MULT_NORM(-iX[6] * T[1] - iX[4]  * T[0]);
-    oX[3]       = MULT_NORM (iX[4] * T[1] - iX[6]  * T[0]);
-    iX         -= 8;
-    T          += 4;
-  }while(iX>=in);
-
-  iX            = in+n2-8;
-  oX            = out+n2+n4;
-  T             = init->trig+n4;
-
-  do{
-    T          -= 4;
-    oX[0]       =  MULT_NORM (iX[4] * T[3] + iX[6] * T[2]);
-    oX[1]       =  MULT_NORM (iX[4] * T[2] - iX[6] * T[3]);
-    oX[2]       =  MULT_NORM (iX[0] * T[1] + iX[2] * T[0]);
-    oX[3]       =  MULT_NORM (iX[0] * T[0] - iX[2] * T[1]);
-    iX         -= 8;
-    oX         += 4;
-  }while(iX>=in);
-
-  mdct_butterflies(init,out+n2,n2);
-  mdct_bitreverse(init,out);
-
-  /* roatate + window */
-
-  {
-    DATA_TYPE *oX1=out+n2+n4;
-    DATA_TYPE *oX2=out+n2+n4;
-    DATA_TYPE *iX =out;
-    T             =init->trig+n2;
-
-    do{
-      oX1-=4;
-
-      oX1[3]  =  MULT_NORM (iX[0] * T[1] - iX[1] * T[0]);
-      oX2[0]  = -MULT_NORM (iX[0] * T[0] + iX[1] * T[1]);
-
-      oX1[2]  =  MULT_NORM (iX[2] * T[3] - iX[3] * T[2]);
-      oX2[1]  = -MULT_NORM (iX[2] * T[2] + iX[3] * T[3]);
-
-      oX1[1]  =  MULT_NORM (iX[4] * T[5] - iX[5] * T[4]);
-      oX2[2]  = -MULT_NORM (iX[4] * T[4] + iX[5] * T[5]);
-
-      oX1[0]  =  MULT_NORM (iX[6] * T[7] - iX[7] * T[6]);
-      oX2[3]  = -MULT_NORM (iX[6] * T[6] + iX[7] * T[7]);
-
-      oX2+=4;
-      iX    +=   8;
-      T     +=   8;
-    }while(iX<oX1);
-
-    iX=out+n2+n4;
-    oX1=out+n4;
-    oX2=oX1;
-
-    do{
-      oX1-=4;
-      iX-=4;
-
-      oX2[0] = -(oX1[3] = iX[3]);
-      oX2[1] = -(oX1[2] = iX[2]);
-      oX2[2] = -(oX1[1] = iX[1]);
-      oX2[3] = -(oX1[0] = iX[0]);
-
-      oX2+=4;
-    }while(oX2<iX);
-
-    iX=out+n2+n4;
-    oX1=out+n2+n4;
-    oX2=out+n2;
-    do{
-      oX1-=4;
-      oX1[0]= iX[3];
-      oX1[1]= iX[2];
-      oX1[2]= iX[1];
-      oX1[3]= iX[0];
-      iX+=4;
-    }while(oX1>oX2);
-  }
-}
-
-void mdct_forward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out){
-  int n=init->n;
-  int n2=n>>1;
-  int n4=n>>2;
-  int n8=n>>3;
-  DATA_TYPE *w=alloca(n*sizeof(*w)); /* forward needs working space */
-  DATA_TYPE *w2=w+n2;
-
-  /* rotate */
-
-  /* window + rotate + step 1 */
-
-  REG_TYPE r0;
-  REG_TYPE r1;
-  DATA_TYPE *x0=in+n2+n4;
-  DATA_TYPE *x1=x0+1;
-  DATA_TYPE *T=init->trig+n2;
-
-  int i=0;
-
-  for(i=0;i<n8;i+=2){
-    x0 -=4;
-    T-=2;
-    r0= x0[2] + x1[0];
-    r1= x0[0] + x1[2];
-    w2[i]=   MULT_NORM(r1*T[1] + r0*T[0]);
-    w2[i+1]= MULT_NORM(r1*T[0] - r0*T[1]);
-    x1 +=4;
-  }
-
-  x1=in+1;
-
-  for(;i<n2-n8;i+=2){
-    T-=2;
-    x0 -=4;
-    r0= x0[2] - x1[0];
-    r1= x0[0] - x1[2];
-    w2[i]=   MULT_NORM(r1*T[1] + r0*T[0]);
-    w2[i+1]= MULT_NORM(r1*T[0] - r0*T[1]);
-    x1 +=4;
-  }
-
-  x0=in+n;
-
-  for(;i<n2;i+=2){
-    T-=2;
-    x0 -=4;
-    r0= -x0[2] - x1[0];
-    r1= -x0[0] - x1[2];
-    w2[i]=   MULT_NORM(r1*T[1] + r0*T[0]);
-    w2[i+1]= MULT_NORM(r1*T[0] - r0*T[1]);
-    x1 +=4;
-  }
-
-
-  mdct_butterflies(init,w+n2,n2);
-  mdct_bitreverse(init,w);
-
-  /* roatate + window */
-
-  T=init->trig+n2;
-  x0=out+n2;
-
-  for(i=0;i<n4;i++){
-    x0--;
-    out[i] =MULT_NORM((w[0]*T[0]+w[1]*T[1])*init->scale);
-    x0[0]  =MULT_NORM((w[0]*T[1]-w[1]*T[0])*init->scale);
-    w+=2;
-    T+=2;
-  }
-}
-- 
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