diff -r e353ca78d28b -r f7e49eff3708 misc/libtremor/floor1.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libtremor/floor1.c	Sun Apr 24 22:57:57 2011 +0200
@@ -0,0 +1,441 @@
+/********************************************************************
+ *                                                                  *
+ * THIS FILE IS PART OF THE OggVorbis 'TREMOR' 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 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
+ * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
+ *                                                                  *
+ ********************************************************************
+
+ function: floor backend 1 implementation
+
+ ********************************************************************/
+
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include "ogg.h"
+#include "ivorbiscodec.h"
+#include "codec_internal.h"
+#include "registry.h"
+#include "codebook.h"
+#include "misc.h"
+#include "block.h"
+
+#define floor1_rangedB 140 /* floor 1 fixed at -140dB to 0dB range */
+
+typedef struct {
+  int forward_index[VIF_POSIT+2];
+  
+  int hineighbor[VIF_POSIT];
+  int loneighbor[VIF_POSIT];
+  int posts;
+
+  int n;
+  int quant_q;
+  vorbis_info_floor1 *vi;
+
+} vorbis_look_floor1;
+
+/***********************************************/
+ 
+static void floor1_free_info(vorbis_info_floor *i){
+  vorbis_info_floor1 *info=(vorbis_info_floor1 *)i;
+  if(info){
+    memset(info,0,sizeof(*info));
+    _ogg_free(info);
+  }
+}
+
+static void floor1_free_look(vorbis_look_floor *i){
+  vorbis_look_floor1 *look=(vorbis_look_floor1 *)i;
+  if(look){
+    memset(look,0,sizeof(*look));
+    _ogg_free(look);
+  }
+}
+
+static int ilog(unsigned int v){
+  int ret=0;
+  while(v){
+    ret++;
+    v>>=1;
+  }
+  return(ret);
+}
+
+static vorbis_info_floor *floor1_unpack (vorbis_info *vi,oggpack_buffer *opb){
+  codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;
+  int j,k,count=0,maxclass=-1,rangebits;
+
+  vorbis_info_floor1 *info=(vorbis_info_floor1 *)_ogg_calloc(1,sizeof(*info));
+  /* read partitions */
+  info->partitions=oggpack_read(opb,5); /* only 0 to 31 legal */
+  for(j=0;j<info->partitions;j++){
+    info->partitionclass[j]=oggpack_read(opb,4); /* only 0 to 15 legal */
+    if(maxclass<info->partitionclass[j])maxclass=info->partitionclass[j];
+  }
+
+  /* read partition classes */
+  for(j=0;j<maxclass+1;j++){
+    info->class_dim[j]=oggpack_read(opb,3)+1; /* 1 to 8 */
+    info->class_subs[j]=oggpack_read(opb,2); /* 0,1,2,3 bits */
+    if(info->class_subs[j]<0)
+      goto err_out;
+    if(info->class_subs[j])info->class_book[j]=oggpack_read(opb,8);
+    if(info->class_book[j]<0 || info->class_book[j]>=ci->books)
+      goto err_out;
+    for(k=0;k<(1<<info->class_subs[j]);k++){
+      info->class_subbook[j][k]=oggpack_read(opb,8)-1;
+      if(info->class_subbook[j][k]<-1 || info->class_subbook[j][k]>=ci->books)
+	goto err_out;
+    }
+  }
+
+  /* read the post list */
+  info->mult=oggpack_read(opb,2)+1;     /* only 1,2,3,4 legal now */ 
+  rangebits=oggpack_read(opb,4);
+
+  for(j=0,k=0;j<info->partitions;j++){
+    count+=info->class_dim[info->partitionclass[j]]; 
+    for(;k<count;k++){
+      int t=info->postlist[k+2]=oggpack_read(opb,rangebits);
+      if(t<0 || t>=(1<<rangebits))
+	goto err_out;
+    }
+  }
+  info->postlist[0]=0;
+  info->postlist[1]=1<<rangebits;
+
+  return(info);
+  
+ err_out:
+  floor1_free_info(info);
+  return(NULL);
+}
+
+static int icomp(const void *a,const void *b){
+  return(**(int **)a-**(int **)b);
+}
+
+static vorbis_look_floor *floor1_look(vorbis_dsp_state *vd,vorbis_info_mode *mi,
+                              vorbis_info_floor *in){
+
+  int *sortpointer[VIF_POSIT+2];
+  vorbis_info_floor1 *info=(vorbis_info_floor1 *)in;
+  vorbis_look_floor1 *look=(vorbis_look_floor1 *)_ogg_calloc(1,sizeof(*look));
+  int i,j,n=0;
+
+  look->vi=info;
+  look->n=info->postlist[1];
+ 
+  /* we drop each position value in-between already decoded values,
+     and use linear interpolation to predict each new value past the
+     edges.  The positions are read in the order of the position
+     list... we precompute the bounding positions in the lookup.  Of
+     course, the neighbors can change (if a position is declined), but
+     this is an initial mapping */
+
+  for(i=0;i<info->partitions;i++)n+=info->class_dim[info->partitionclass[i]];
+  n+=2;
+  look->posts=n;
+
+  /* also store a sorted position index */
+  for(i=0;i<n;i++)sortpointer[i]=info->postlist+i;
+  qsort(sortpointer,n,sizeof(*sortpointer),icomp);
+
+  /* points from sort order back to range number */
+  for(i=0;i<n;i++)look->forward_index[i]=sortpointer[i]-info->postlist;
+  
+  /* quantize values to multiplier spec */
+  switch(info->mult){
+  case 1: /* 1024 -> 256 */
+    look->quant_q=256;
+    break;
+  case 2: /* 1024 -> 128 */
+    look->quant_q=128;
+    break;
+  case 3: /* 1024 -> 86 */
+    look->quant_q=86;
+    break;
+  case 4: /* 1024 -> 64 */
+    look->quant_q=64;
+    break;
+  }
+
+  /* discover our neighbors for decode where we don't use fit flags
+     (that would push the neighbors outward) */
+  for(i=0;i<n-2;i++){
+    int lo=0;
+    int hi=1;
+    int lx=0;
+    int hx=look->n;
+    int currentx=info->postlist[i+2];
+    for(j=0;j<i+2;j++){
+      int x=info->postlist[j];
+      if(x>lx && x<currentx){
+	lo=j;
+	lx=x;
+      }
+      if(x<hx && x>currentx){
+	hi=j;
+	hx=x;
+      }
+    }
+    look->loneighbor[i]=lo;
+    look->hineighbor[i]=hi;
+  }
+
+  return(look);
+}
+
+static int render_point(int x0,int x1,int y0,int y1,int x){
+  y0&=0x7fff; /* mask off flag */
+  y1&=0x7fff;
+    
+  {
+    int dy=y1-y0;
+    int adx=x1-x0;
+    int ady=abs(dy);
+    int err=ady*(x-x0);
+    
+    int off=err/adx;
+    if(dy<0)return(y0-off);
+    return(y0+off);
+  }
+}
+
+#ifdef _LOW_ACCURACY_
+#  define XdB(n) ((((n)>>8)+1)>>1)
+#else
+#  define XdB(n) (n)
+#endif
+
+static const ogg_int32_t FLOOR_fromdB_LOOKUP[256]={
+  XdB(0x000000e5), XdB(0x000000f4), XdB(0x00000103), XdB(0x00000114),
+  XdB(0x00000126), XdB(0x00000139), XdB(0x0000014e), XdB(0x00000163),
+  XdB(0x0000017a), XdB(0x00000193), XdB(0x000001ad), XdB(0x000001c9),
+  XdB(0x000001e7), XdB(0x00000206), XdB(0x00000228), XdB(0x0000024c),
+  XdB(0x00000272), XdB(0x0000029b), XdB(0x000002c6), XdB(0x000002f4),
+  XdB(0x00000326), XdB(0x0000035a), XdB(0x00000392), XdB(0x000003cd),
+  XdB(0x0000040c), XdB(0x00000450), XdB(0x00000497), XdB(0x000004e4),
+  XdB(0x00000535), XdB(0x0000058c), XdB(0x000005e8), XdB(0x0000064a),
+  XdB(0x000006b3), XdB(0x00000722), XdB(0x00000799), XdB(0x00000818),
+  XdB(0x0000089e), XdB(0x0000092e), XdB(0x000009c6), XdB(0x00000a69),
+  XdB(0x00000b16), XdB(0x00000bcf), XdB(0x00000c93), XdB(0x00000d64),
+  XdB(0x00000e43), XdB(0x00000f30), XdB(0x0000102d), XdB(0x0000113a),
+  XdB(0x00001258), XdB(0x0000138a), XdB(0x000014cf), XdB(0x00001629),
+  XdB(0x0000179a), XdB(0x00001922), XdB(0x00001ac4), XdB(0x00001c82),
+  XdB(0x00001e5c), XdB(0x00002055), XdB(0x0000226f), XdB(0x000024ac),
+  XdB(0x0000270e), XdB(0x00002997), XdB(0x00002c4b), XdB(0x00002f2c),
+  XdB(0x0000323d), XdB(0x00003581), XdB(0x000038fb), XdB(0x00003caf),
+  XdB(0x000040a0), XdB(0x000044d3), XdB(0x0000494c), XdB(0x00004e10),
+  XdB(0x00005323), XdB(0x0000588a), XdB(0x00005e4b), XdB(0x0000646b),
+  XdB(0x00006af2), XdB(0x000071e5), XdB(0x0000794c), XdB(0x0000812e),
+  XdB(0x00008993), XdB(0x00009283), XdB(0x00009c09), XdB(0x0000a62d),
+  XdB(0x0000b0f9), XdB(0x0000bc79), XdB(0x0000c8b9), XdB(0x0000d5c4),
+  XdB(0x0000e3a9), XdB(0x0000f274), XdB(0x00010235), XdB(0x000112fd),
+  XdB(0x000124dc), XdB(0x000137e4), XdB(0x00014c29), XdB(0x000161bf),
+  XdB(0x000178bc), XdB(0x00019137), XdB(0x0001ab4a), XdB(0x0001c70e),
+  XdB(0x0001e4a1), XdB(0x0002041f), XdB(0x000225aa), XdB(0x00024962),
+  XdB(0x00026f6d), XdB(0x000297f0), XdB(0x0002c316), XdB(0x0002f109),
+  XdB(0x000321f9), XdB(0x00035616), XdB(0x00038d97), XdB(0x0003c8b4),
+  XdB(0x000407a7), XdB(0x00044ab2), XdB(0x00049218), XdB(0x0004de23),
+  XdB(0x00052f1e), XdB(0x0005855c), XdB(0x0005e135), XdB(0x00064306),
+  XdB(0x0006ab33), XdB(0x00071a24), XdB(0x0007904b), XdB(0x00080e20),
+  XdB(0x00089422), XdB(0x000922da), XdB(0x0009bad8), XdB(0x000a5cb6),
+  XdB(0x000b091a), XdB(0x000bc0b1), XdB(0x000c8436), XdB(0x000d5471),
+  XdB(0x000e3233), XdB(0x000f1e5f), XdB(0x001019e4), XdB(0x001125c1),
+  XdB(0x00124306), XdB(0x001372d5), XdB(0x0014b663), XdB(0x00160ef7),
+  XdB(0x00177df0), XdB(0x001904c1), XdB(0x001aa4f9), XdB(0x001c603d),
+  XdB(0x001e384f), XdB(0x00202f0f), XdB(0x0022467a), XdB(0x002480b1),
+  XdB(0x0026dff7), XdB(0x002966b3), XdB(0x002c1776), XdB(0x002ef4fc),
+  XdB(0x0032022d), XdB(0x00354222), XdB(0x0038b828), XdB(0x003c67c2),
+  XdB(0x004054ae), XdB(0x004482e8), XdB(0x0048f6af), XdB(0x004db488),
+  XdB(0x0052c142), XdB(0x005821ff), XdB(0x005ddc33), XdB(0x0063f5b0),
+  XdB(0x006a74a7), XdB(0x00715faf), XdB(0x0078bdce), XdB(0x0080967f),
+  XdB(0x0088f1ba), XdB(0x0091d7f9), XdB(0x009b5247), XdB(0x00a56a41),
+  XdB(0x00b02a27), XdB(0x00bb9ce2), XdB(0x00c7ce12), XdB(0x00d4ca17),
+  XdB(0x00e29e20), XdB(0x00f15835), XdB(0x0101074b), XdB(0x0111bb4e),
+  XdB(0x01238531), XdB(0x01367704), XdB(0x014aa402), XdB(0x016020a7),
+  XdB(0x017702c3), XdB(0x018f6190), XdB(0x01a955cb), XdB(0x01c4f9cf),
+  XdB(0x01e269a8), XdB(0x0201c33b), XdB(0x0223265a), XdB(0x0246b4ea),
+  XdB(0x026c9302), XdB(0x0294e716), XdB(0x02bfda13), XdB(0x02ed9793),
+  XdB(0x031e4e09), XdB(0x03522ee4), XdB(0x03896ed0), XdB(0x03c445e2),
+  XdB(0x0402efd6), XdB(0x0445ac4b), XdB(0x048cbefc), XdB(0x04d87013),
+  XdB(0x05290c67), XdB(0x057ee5ca), XdB(0x05da5364), XdB(0x063bb204),
+  XdB(0x06a36485), XdB(0x0711d42b), XdB(0x0787710e), XdB(0x0804b299),
+  XdB(0x088a17ef), XdB(0x0918287e), XdB(0x09af747c), XdB(0x0a50957e),
+  XdB(0x0afc2f19), XdB(0x0bb2ef7f), XdB(0x0c759034), XdB(0x0d44d6ca),
+  XdB(0x0e2195bc), XdB(0x0f0cad0d), XdB(0x10070b62), XdB(0x1111aeea),
+  XdB(0x122da66c), XdB(0x135c120f), XdB(0x149e24d9), XdB(0x15f525b1),
+  XdB(0x176270e3), XdB(0x18e7794b), XdB(0x1a85c9ae), XdB(0x1c3f06d1),
+  XdB(0x1e14f07d), XdB(0x200963d7), XdB(0x221e5ccd), XdB(0x2455f870),
+  XdB(0x26b2770b), XdB(0x29363e2b), XdB(0x2be3db5c), XdB(0x2ebe06b6),
+  XdB(0x31c7a55b), XdB(0x3503ccd4), XdB(0x3875c5aa), XdB(0x3c210f44),
+  XdB(0x4009632b), XdB(0x4432b8cf), XdB(0x48a149bc), XdB(0x4d59959e),
+  XdB(0x52606733), XdB(0x57bad899), XdB(0x5d6e593a), XdB(0x6380b298),
+  XdB(0x69f80e9a), XdB(0x70dafda8), XdB(0x78307d76), XdB(0x7fffffff),
+};
+  
+static void render_line(int n, int x0,int x1,int y0,int y1,ogg_int32_t *d){
+  int dy=y1-y0;
+  int adx=x1-x0;
+  int ady=abs(dy);
+  int base=dy/adx;
+  int sy=(dy<0?base-1:base+1);
+  int x=x0;
+  int y=y0;
+  int err=0;
+
+  if(n>x1)n=x1;
+  ady-=abs(base*adx);
+
+  if(x<n)
+    d[x]= MULT31_SHIFT15(d[x],FLOOR_fromdB_LOOKUP[y]);
+
+  while(++x<n){
+    err=err+ady;
+    if(err>=adx){
+      err-=adx;
+      y+=sy;
+    }else{
+      y+=base;
+    }
+    d[x]= MULT31_SHIFT15(d[x],FLOOR_fromdB_LOOKUP[y]);
+  }
+}
+
+static void *floor1_inverse1(vorbis_block *vb,vorbis_look_floor *in){
+  vorbis_look_floor1 *look=(vorbis_look_floor1 *)in;
+  vorbis_info_floor1 *info=look->vi;
+  codec_setup_info   *ci=(codec_setup_info *)vb->vd->vi->codec_setup;
+  
+  int i,j,k;
+  codebook *books=ci->fullbooks;   
+  
+  /* unpack wrapped/predicted values from stream */
+  if(oggpack_read(&vb->opb,1)==1){
+    int *fit_value=(int *)_vorbis_block_alloc(vb,(look->posts)*sizeof(*fit_value));
+    
+    fit_value[0]=oggpack_read(&vb->opb,ilog(look->quant_q-1));
+    fit_value[1]=oggpack_read(&vb->opb,ilog(look->quant_q-1));
+    
+    /* partition by partition */
+    /* partition by partition */
+    for(i=0,j=2;i<info->partitions;i++){
+      int classv=info->partitionclass[i];
+      int cdim=info->class_dim[classv];
+      int csubbits=info->class_subs[classv];
+      int csub=1<<csubbits;
+      int cval=0;
+
+      /* decode the partition's first stage cascade value */
+      if(csubbits){
+	cval=vorbis_book_decode(books+info->class_book[classv],&vb->opb);
+
+	if(cval==-1)goto eop;
+      }
+
+      for(k=0;k<cdim;k++){
+	int book=info->class_subbook[classv][cval&(csub-1)];
+	cval>>=csubbits;
+	if(book>=0){
+	  if((fit_value[j+k]=vorbis_book_decode(books+book,&vb->opb))==-1)
+	    goto eop;
+	}else{
+	  fit_value[j+k]=0;
+	}
+      }
+      j+=cdim;
+    }
+
+    /* unwrap positive values and reconsitute via linear interpolation */
+    for(i=2;i<look->posts;i++){
+      int predicted=render_point(info->postlist[look->loneighbor[i-2]],
+				 info->postlist[look->hineighbor[i-2]],
+				 fit_value[look->loneighbor[i-2]],
+				 fit_value[look->hineighbor[i-2]],
+				 info->postlist[i]);
+      int hiroom=look->quant_q-predicted;
+      int loroom=predicted;
+      int room=(hiroom<loroom?hiroom:loroom)<<1;
+      int val=fit_value[i];
+
+      if(val){
+	if(val>=room){
+	  if(hiroom>loroom){
+	    val = val-loroom;
+	  }else{
+	  val = -1-(val-hiroom);
+	  }
+	}else{
+	  if(val&1){
+	    val= -((val+1)>>1);
+	  }else{
+	    val>>=1;
+	  }
+	}
+
+	fit_value[i]=val+predicted;
+	fit_value[look->loneighbor[i-2]]&=0x7fff;
+	fit_value[look->hineighbor[i-2]]&=0x7fff;
+
+      }else{
+	fit_value[i]=predicted|0x8000;
+      }
+	
+    }
+
+    return(fit_value);
+  }
+ eop:
+  return(NULL);
+}
+
+static int floor1_inverse2(vorbis_block *vb,vorbis_look_floor *in,void *memo,
+			  ogg_int32_t *out){
+  vorbis_look_floor1 *look=(vorbis_look_floor1 *)in;
+  vorbis_info_floor1 *info=look->vi;
+
+  codec_setup_info   *ci=(codec_setup_info *)vb->vd->vi->codec_setup;
+  int                  n=ci->blocksizes[vb->W]/2;
+  int j;
+
+  if(memo){
+    /* render the lines */
+    int *fit_value=(int *)memo;
+    int hx=0;
+    int lx=0;
+    int ly=fit_value[0]*info->mult;
+    for(j=1;j<look->posts;j++){
+      int current=look->forward_index[j];
+      int hy=fit_value[current]&0x7fff;
+      if(hy==fit_value[current]){
+	
+	hy*=info->mult;
+	hx=info->postlist[current];
+	
+	render_line(n,lx,hx,ly,hy,out);
+	
+	lx=hx;
+	ly=hy;
+      }
+    }
+    for(j=hx;j<n;j++)out[j]*=ly; /* be certain */    
+    return(1);
+  }
+  memset(out,0,sizeof(*out)*n);
+  return(0);
+}
+
+/* export hooks */
+vorbis_func_floor floor1_exportbundle={
+  &floor1_unpack,&floor1_look,&floor1_free_info,
+  &floor1_free_look,&floor1_inverse1,&floor1_inverse2
+};
+