+/********************************************************************
+ * *
+ * 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: floor backend 1 implementation
+ last mod: $Id: floor1.c 18151 2012-01-20 07:35:26Z xiphmont $
+
+ ********************************************************************/
+
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <ogg/ogg.h>
+#include "vorbis/codec.h"
+#include "codec_internal.h"
+#include "registry.h"
+#include "codebook.h"
+#include "misc.h"
+#include "scales.h"
+
+#include <stdio.h>
+
+#define floor1_rangedB 140 /* floor 1 fixed at -140dB to 0dB range */
+
+typedef struct lsfit_acc{
+ int x0;
+ int x1;
+
+ int xa;
+ int ya;
+ int x2a;
+ int y2a;
+ int xya;
+ int an;
+
+ int xb;
+ int yb;
+ int x2b;
+ int y2b;
+ int xyb;
+ int bn;
+} lsfit_acc;
+
+/***********************************************/
+
+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){
+ /*fprintf(stderr,"floor 1 bit usage %f:%f (%f total)\n",
+ (float)look->phrasebits/look->frames,
+ (float)look->postbits/look->frames,
+ (float)(look->postbits+look->phrasebits)/look->frames);*/
+
+ 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 int ilog2(unsigned int v){
+ int ret=0;
+ if(v)--v;
+ while(v){
+ ret++;
+ v>>=1;
+ }
+ return(ret);
+}
+
+static void floor1_pack (vorbis_info_floor *i,oggpack_buffer *opb){
+ vorbis_info_floor1 *info=(vorbis_info_floor1 *)i;
+ int j,k;
+ int count=0;
+ int rangebits;
+ int maxposit=info->postlist[1];
+ int maxclass=-1;
+
+ /* save out partitions */
+ oggpack_write(opb,info->partitions,5); /* only 0 to 31 legal */
+ for(j=0;j<info->partitions;j++){
+ oggpack_write(opb,info->partitionclass[j],4); /* only 0 to 15 legal */
+ if(maxclass<info->partitionclass[j])maxclass=info->partitionclass[j];
+ }
+
+ /* save out partition classes */
+ for(j=0;j<maxclass+1;j++){
+ oggpack_write(opb,info->class_dim[j]-1,3); /* 1 to 8 */
+ oggpack_write(opb,info->class_subs[j],2); /* 0 to 3 */
+ if(info->class_subs[j])oggpack_write(opb,info->class_book[j],8);
+ for(k=0;k<(1<<info->class_subs[j]);k++)
+ oggpack_write(opb,info->class_subbook[j][k]+1,8);
+ }
+
+ /* save out the post list */
+ oggpack_write(opb,info->mult-1,2); /* only 1,2,3,4 legal now */
+ oggpack_write(opb,ilog2(maxposit),4);
+ rangebits=ilog2(maxposit);
+
+ for(j=0,k=0;j<info->partitions;j++){
+ count+=info->class_dim[info->partitionclass[j]];
+ for(;k<count;k++)
+ oggpack_write(opb,info->postlist[k+2],rangebits);
+ }
+}
+
+static int icomp(const void *a,const void *b){
+ return(**(int **)a-**(int **)b);
+}
+
+static vorbis_info_floor *floor1_unpack (vorbis_info *vi,oggpack_buffer *opb){
+ codec_setup_info *ci=vi->codec_setup;
+ int j,k,count=0,maxclass=-1,rangebits;
+
+ vorbis_info_floor1 *info=_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(info->partitionclass[j]<0)goto err_out;
+ 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);
+ if(rangebits<0)goto err_out;
+
+ for(j=0,k=0;j<info->partitions;j++){
+ count+=info->class_dim[info->partitionclass[j]];
+ if(count>VIF_POSIT) goto err_out;
+ 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;
+
+ /* don't allow repeated values in post list as they'd result in
+ zero-length segments */
+ {
+ int *sortpointer[VIF_POSIT+2];
+ for(j=0;j<count+2;j++)sortpointer[j]=info->postlist+j;
+ qsort(sortpointer,count+2,sizeof(*sortpointer),icomp);
+
+ for(j=1;j<count+2;j++)
+ if(*sortpointer[j-1]==*sortpointer[j])goto err_out;
+ }
+
+ return(info);
+
+ err_out:
+ floor1_free_info(info);
+ return(NULL);
+}
+
+static vorbis_look_floor *floor1_look(vorbis_dsp_state *vd,
+ vorbis_info_floor *in){
+
+ int *sortpointer[VIF_POSIT+2];
+ vorbis_info_floor1 *info=(vorbis_info_floor1 *)in;
+ vorbis_look_floor1 *look=_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;
+ /* points from range order to sorted position */
+ for(i=0;i<n;i++)look->reverse_index[look->forward_index[i]]=i;
+ /* we actually need the post values too */
+ for(i=0;i<n;i++)look->sorted_index[i]=info->postlist[look->forward_index[i]];
+
+ /* 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);
+ }
+}
+
+static int vorbis_dBquant(const float *x){
+ int i= *x*7.3142857f+1023.5f;
+ if(i>1023)return(1023);
+ if(i<0)return(0);
+ return i;
+}
+
+static const float FLOOR1_fromdB_LOOKUP[256]={
+ 1.0649863e-07F, 1.1341951e-07F, 1.2079015e-07F, 1.2863978e-07F,
+ 1.3699951e-07F, 1.4590251e-07F, 1.5538408e-07F, 1.6548181e-07F,
+ 1.7623575e-07F, 1.8768855e-07F, 1.9988561e-07F, 2.128753e-07F,
+ 2.2670913e-07F, 2.4144197e-07F, 2.5713223e-07F, 2.7384213e-07F,
+ 2.9163793e-07F, 3.1059021e-07F, 3.3077411e-07F, 3.5226968e-07F,
+ 3.7516214e-07F, 3.9954229e-07F, 4.2550680e-07F, 4.5315863e-07F,
+ 4.8260743e-07F, 5.1396998e-07F, 5.4737065e-07F, 5.8294187e-07F,
+ 6.2082472e-07F, 6.6116941e-07F, 7.0413592e-07F, 7.4989464e-07F,
+ 7.9862701e-07F, 8.5052630e-07F, 9.0579828e-07F, 9.6466216e-07F,
+ 1.0273513e-06F, 1.0941144e-06F, 1.1652161e-06F, 1.2409384e-06F,
+ 1.3215816e-06F, 1.4074654e-06F, 1.4989305e-06F, 1.5963394e-06F,
+ 1.7000785e-06F, 1.8105592e-06F, 1.9282195e-06F, 2.0535261e-06F,
+ 2.1869758e-06F, 2.3290978e-06F, 2.4804557e-06F, 2.6416497e-06F,
+ 2.8133190e-06F, 2.9961443e-06F, 3.1908506e-06F, 3.3982101e-06F,
+ 3.6190449e-06F, 3.8542308e-06F, 4.1047004e-06F, 4.3714470e-06F,
+ 4.6555282e-06F, 4.9580707e-06F, 5.2802740e-06F, 5.6234160e-06F,
+ 5.9888572e-06F, 6.3780469e-06F, 6.7925283e-06F, 7.2339451e-06F,
+ 7.7040476e-06F, 8.2047000e-06F, 8.7378876e-06F, 9.3057248e-06F,
+ 9.9104632e-06F, 1.0554501e-05F, 1.1240392e-05F, 1.1970856e-05F,
+ 1.2748789e-05F, 1.3577278e-05F, 1.4459606e-05F, 1.5399272e-05F,
+ 1.6400004e-05F, 1.7465768e-05F, 1.8600792e-05F, 1.9809576e-05F,
+ 2.1096914e-05F, 2.2467911e-05F, 2.3928002e-05F, 2.5482978e-05F,
+ 2.7139006e-05F, 2.8902651e-05F, 3.0780908e-05F, 3.2781225e-05F,
+ 3.4911534e-05F, 3.7180282e-05F, 3.9596466e-05F, 4.2169667e-05F,
+ 4.4910090e-05F, 4.7828601e-05F, 5.0936773e-05F, 5.4246931e-05F,
+ 5.7772202e-05F, 6.1526565e-05F, 6.5524908e-05F, 6.9783085e-05F,
+ 7.4317983e-05F, 7.9147585e-05F, 8.4291040e-05F, 8.9768747e-05F,
+ 9.5602426e-05F, 0.00010181521F, 0.00010843174F, 0.00011547824F,
+ 0.00012298267F, 0.00013097477F, 0.00013948625F, 0.00014855085F,
+ 0.00015820453F, 0.00016848555F, 0.00017943469F, 0.00019109536F,
+ 0.00020351382F, 0.00021673929F, 0.00023082423F, 0.00024582449F,
+ 0.00026179955F, 0.00027881276F, 0.00029693158F, 0.00031622787F,
+ 0.00033677814F, 0.00035866388F, 0.00038197188F, 0.00040679456F,
+ 0.00043323036F, 0.00046138411F, 0.00049136745F, 0.00052329927F,
+ 0.00055730621F, 0.00059352311F, 0.00063209358F, 0.00067317058F,
+ 0.00071691700F, 0.00076350630F, 0.00081312324F, 0.00086596457F,
+ 0.00092223983F, 0.00098217216F, 0.0010459992F, 0.0011139742F,
+ 0.0011863665F, 0.0012634633F, 0.0013455702F, 0.0014330129F,
+ 0.0015261382F, 0.0016253153F, 0.0017309374F, 0.0018434235F,
+ 0.0019632195F, 0.0020908006F, 0.0022266726F, 0.0023713743F,
+ 0.0025254795F, 0.0026895994F, 0.0028643847F, 0.0030505286F,
+ 0.0032487691F, 0.0034598925F, 0.0036847358F, 0.0039241906F,
+ 0.0041792066F, 0.0044507950F, 0.0047400328F, 0.0050480668F,
+ 0.0053761186F, 0.0057254891F, 0.0060975636F, 0.0064938176F,
+ 0.0069158225F, 0.0073652516F, 0.0078438871F, 0.0083536271F,
+ 0.0088964928F, 0.009474637F, 0.010090352F, 0.010746080F,
+ 0.011444421F, 0.012188144F, 0.012980198F, 0.013823725F,
+ 0.014722068F, 0.015678791F, 0.016697687F, 0.017782797F,
+ 0.018938423F, 0.020169149F, 0.021479854F, 0.022875735F,
+ 0.024362330F, 0.025945531F, 0.027631618F, 0.029427276F,
+ 0.031339626F, 0.033376252F, 0.035545228F, 0.037855157F,
+ 0.040315199F, 0.042935108F, 0.045725273F, 0.048696758F,
+ 0.051861348F, 0.055231591F, 0.058820850F, 0.062643361F,
+ 0.066714279F, 0.071049749F, 0.075666962F, 0.080584227F,
+ 0.085821044F, 0.091398179F, 0.097337747F, 0.10366330F,
+ 0.11039993F, 0.11757434F, 0.12521498F, 0.13335215F,
+ 0.14201813F, 0.15124727F, 0.16107617F, 0.17154380F,
+ 0.18269168F, 0.19456402F, 0.20720788F, 0.22067342F,
+ 0.23501402F, 0.25028656F, 0.26655159F, 0.28387361F,
+ 0.30232132F, 0.32196786F, 0.34289114F, 0.36517414F,
+ 0.38890521F, 0.41417847F, 0.44109412F, 0.46975890F,
+ 0.50028648F, 0.53279791F, 0.56742212F, 0.60429640F,
+ 0.64356699F, 0.68538959F, 0.72993007F, 0.77736504F,
+ 0.82788260F, 0.88168307F, 0.9389798F, 1.F,
+};
+
+static void render_line(int n, int x0,int x1,int y0,int y1,float *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;
+
+ ady-=abs(base*adx);
+
+ if(n>x1)n=x1;
+
+ if(x<n)
+ d[x]*=FLOOR1_fromdB_LOOKUP[y];
+
+ while(++x<n){
+ err=err+ady;
+ if(err>=adx){
+ err-=adx;
+ y+=sy;
+ }else{
+ y+=base;
+ }
+ d[x]*=FLOOR1_fromdB_LOOKUP[y];
+ }
+}
+
+static void render_line0(int n, int x0,int x1,int y0,int y1,int *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;
+
+ ady-=abs(base*adx);
+
+ if(n>x1)n=x1;
+
+ if(x<n)
+ d[x]=y;
+
+ while(++x<n){
+ err=err+ady;
+ if(err>=adx){
+ err-=adx;
+ y+=sy;
+ }else{
+ y+=base;
+ }
+ d[x]=y;
+ }
+}
+
+/* the floor has already been filtered to only include relevant sections */
+static int accumulate_fit(const float *flr,const float *mdct,
+ int x0, int x1,lsfit_acc *a,
+ int n,vorbis_info_floor1 *info){
+ long i;
+
+ int xa=0,ya=0,x2a=0,y2a=0,xya=0,na=0, xb=0,yb=0,x2b=0,y2b=0,xyb=0,nb=0;
+
+ memset(a,0,sizeof(*a));
+ a->x0=x0;
+ a->x1=x1;
+ if(x1>=n)x1=n-1;
+
+ for(i=x0;i<=x1;i++){
+ int quantized=vorbis_dBquant(flr+i);
+ if(quantized){
+ if(mdct[i]+info->twofitatten>=flr[i]){
+ xa += i;
+ ya += quantized;
+ x2a += i*i;
+ y2a += quantized*quantized;
+ xya += i*quantized;
+ na++;
+ }else{
+ xb += i;
+ yb += quantized;
+ x2b += i*i;
+ y2b += quantized*quantized;
+ xyb += i*quantized;
+ nb++;
+ }
+ }
+ }
+
+ a->xa=xa;
+ a->ya=ya;
+ a->x2a=x2a;
+ a->y2a=y2a;
+ a->xya=xya;
+ a->an=na;
+
+ a->xb=xb;
+ a->yb=yb;
+ a->x2b=x2b;
+ a->y2b=y2b;
+ a->xyb=xyb;
+ a->bn=nb;
+
+ return(na);
+}
+
+static int fit_line(lsfit_acc *a,int fits,int *y0,int *y1,
+ vorbis_info_floor1 *info){
+ double xb=0,yb=0,x2b=0,y2b=0,xyb=0,bn=0;
+ int i;
+ int x0=a[0].x0;
+ int x1=a[fits-1].x1;
+
+ for(i=0;i<fits;i++){
+ double weight = (a[i].bn+a[i].an)*info->twofitweight/(a[i].an+1)+1.;
+
+ xb+=a[i].xb + a[i].xa * weight;
+ yb+=a[i].yb + a[i].ya * weight;
+ x2b+=a[i].x2b + a[i].x2a * weight;
+ y2b+=a[i].y2b + a[i].y2a * weight;
+ xyb+=a[i].xyb + a[i].xya * weight;
+ bn+=a[i].bn + a[i].an * weight;
+ }
+
+ if(*y0>=0){
+ xb+= x0;
+ yb+= *y0;
+ x2b+= x0 * x0;
+ y2b+= *y0 * *y0;
+ xyb+= *y0 * x0;
+ bn++;
+ }
+
+ if(*y1>=0){
+ xb+= x1;
+ yb+= *y1;
+ x2b+= x1 * x1;
+ y2b+= *y1 * *y1;
+ xyb+= *y1 * x1;
+ bn++;
+ }
+
+ {
+ double denom=(bn*x2b-xb*xb);
+
+ if(denom>0.){
+ double a=(yb*x2b-xyb*xb)/denom;
+ double b=(bn*xyb-xb*yb)/denom;
+ *y0=rint(a+b*x0);
+ *y1=rint(a+b*x1);
+
+ /* limit to our range! */
+ if(*y0>1023)*y0=1023;
+ if(*y1>1023)*y1=1023;
+ if(*y0<0)*y0=0;
+ if(*y1<0)*y1=0;
+
+ return 0;
+ }else{
+ *y0=0;
+ *y1=0;
+ return 1;
+ }
+ }
+}
+
+static int inspect_error(int x0,int x1,int y0,int y1,const float *mask,
+ const float *mdct,
+ vorbis_info_floor1 *info){
+ 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;
+ int val=vorbis_dBquant(mask+x);
+ int mse=0;
+ int n=0;
+
+ ady-=abs(base*adx);
+
+ mse=(y-val);
+ mse*=mse;
+ n++;
+ if(mdct[x]+info->twofitatten>=mask[x]){
+ if(y+info->maxover<val)return(1);
+ if(y-info->maxunder>val)return(1);
+ }
+
+ while(++x<x1){
+ err=err+ady;
+ if(err>=adx){
+ err-=adx;
+ y+=sy;
+ }else{
+ y+=base;
+ }
+
+ val=vorbis_dBquant(mask+x);
+ mse+=((y-val)*(y-val));
+ n++;
+ if(mdct[x]+info->twofitatten>=mask[x]){
+ if(val){
+ if(y+info->maxover<val)return(1);
+ if(y-info->maxunder>val)return(1);
+ }
+ }
+ }
+
+ if(info->maxover*info->maxover/n>info->maxerr)return(0);
+ if(info->maxunder*info->maxunder/n>info->maxerr)return(0);
+ if(mse/n>info->maxerr)return(1);
+ return(0);
+}
+
+static int post_Y(int *A,int *B,int pos){
+ if(A[pos]<0)
+ return B[pos];
+ if(B[pos]<0)
+ return A[pos];
+
+ return (A[pos]+B[pos])>>1;
+}
+
+int *floor1_fit(vorbis_block *vb,vorbis_look_floor1 *look,
+ const float *logmdct, /* in */
+ const float *logmask){
+ long i,j;
+ vorbis_info_floor1 *info=look->vi;
+ long n=look->n;
+ long posts=look->posts;
+ long nonzero=0;
+ lsfit_acc fits[VIF_POSIT+1];
+ int fit_valueA[VIF_POSIT+2]; /* index by range list position */
+ int fit_valueB[VIF_POSIT+2]; /* index by range list position */
+
+ int loneighbor[VIF_POSIT+2]; /* sorted index of range list position (+2) */
+ int hineighbor[VIF_POSIT+2];
+ int *output=NULL;
+ int memo[VIF_POSIT+2];
+
+ for(i=0;i<posts;i++)fit_valueA[i]=-200; /* mark all unused */
+ for(i=0;i<posts;i++)fit_valueB[i]=-200; /* mark all unused */
+ for(i=0;i<posts;i++)loneighbor[i]=0; /* 0 for the implicit 0 post */
+ for(i=0;i<posts;i++)hineighbor[i]=1; /* 1 for the implicit post at n */
+ for(i=0;i<posts;i++)memo[i]=-1; /* no neighbor yet */
+
+ /* quantize the relevant floor points and collect them into line fit
+ structures (one per minimal division) at the same time */
+ if(posts==0){
+ nonzero+=accumulate_fit(logmask,logmdct,0,n,fits,n,info);
+ }else{
+ for(i=0;i<posts-1;i++)
+ nonzero+=accumulate_fit(logmask,logmdct,look->sorted_index[i],
+ look->sorted_index[i+1],fits+i,
+ n,info);
+ }
+
+ if(nonzero){
+ /* start by fitting the implicit base case.... */
+ int y0=-200;
+ int y1=-200;
+ fit_line(fits,posts-1,&y0,&y1,info);
+
+ fit_valueA[0]=y0;
+ fit_valueB[0]=y0;
+ fit_valueB[1]=y1;
+ fit_valueA[1]=y1;
+
+ /* Non degenerate case */
+ /* start progressive splitting. This is a greedy, non-optimal
+ algorithm, but simple and close enough to the best
+ answer. */
+ for(i=2;i<posts;i++){
+ int sortpos=look->reverse_index[i];
+ int ln=loneighbor[sortpos];
+ int hn=hineighbor[sortpos];
+
+ /* eliminate repeat searches of a particular range with a memo */
+ if(memo[ln]!=hn){
+ /* haven't performed this error search yet */
+ int lsortpos=look->reverse_index[ln];
+ int hsortpos=look->reverse_index[hn];
+ memo[ln]=hn;
+
+ {
+ /* A note: we want to bound/minimize *local*, not global, error */
+ int lx=info->postlist[ln];
+ int hx=info->postlist[hn];
+ int ly=post_Y(fit_valueA,fit_valueB,ln);
+ int hy=post_Y(fit_valueA,fit_valueB,hn);
+
+ if(ly==-1 || hy==-1){
+ exit(1);
+ }
+
+ if(inspect_error(lx,hx,ly,hy,logmask,logmdct,info)){
+ /* outside error bounds/begin search area. Split it. */
+ int ly0=-200;
+ int ly1=-200;
+ int hy0=-200;
+ int hy1=-200;
+ int ret0=fit_line(fits+lsortpos,sortpos-lsortpos,&ly0,&ly1,info);
+ int ret1=fit_line(fits+sortpos,hsortpos-sortpos,&hy0,&hy1,info);
+
+ if(ret0){
+ ly0=ly;
+ ly1=hy0;
+ }
+ if(ret1){
+ hy0=ly1;
+ hy1=hy;
+ }
+
+ if(ret0 && ret1){
+ fit_valueA[i]=-200;
+ fit_valueB[i]=-200;
+ }else{
+ /* store new edge values */
+ fit_valueB[ln]=ly0;
+ if(ln==0)fit_valueA[ln]=ly0;
+ fit_valueA[i]=ly1;
+ fit_valueB[i]=hy0;
+ fit_valueA[hn]=hy1;
+ if(hn==1)fit_valueB[hn]=hy1;
+
+ if(ly1>=0 || hy0>=0){
+ /* store new neighbor values */
+ for(j=sortpos-1;j>=0;j--)
+ if(hineighbor[j]==hn)
+ hineighbor[j]=i;
+ else
+ break;
+ for(j=sortpos+1;j<posts;j++)
+ if(loneighbor[j]==ln)
+ loneighbor[j]=i;
+ else
+ break;
+ }
+ }
+ }else{
+ fit_valueA[i]=-200;
+ fit_valueB[i]=-200;
+ }
+ }
+ }
+ }
+
+ output=_vorbis_block_alloc(vb,sizeof(*output)*posts);
+
+ output[0]=post_Y(fit_valueA,fit_valueB,0);
+ output[1]=post_Y(fit_valueA,fit_valueB,1);
+
+ /* fill in posts marked as not using a fit; we will zero
+ back out to 'unused' when encoding them so long as curve
+ interpolation doesn't force them into use */
+ for(i=2;i<posts;i++){
+ int ln=look->loneighbor[i-2];
+ int hn=look->hineighbor[i-2];
+ int x0=info->postlist[ln];
+ int x1=info->postlist[hn];
+ int y0=output[ln];
+ int y1=output[hn];
+
+ int predicted=render_point(x0,x1,y0,y1,info->postlist[i]);
+ int vx=post_Y(fit_valueA,fit_valueB,i);
+
+ if(vx>=0 && predicted!=vx){
+ output[i]=vx;
+ }else{
+ output[i]= predicted|0x8000;
+ }
+ }
+ }
+
+ return(output);
+
+}
+
+int *floor1_interpolate_fit(vorbis_block *vb,vorbis_look_floor1 *look,
+ int *A,int *B,
+ int del){
+
+ long i;
+ long posts=look->posts;
+ int *output=NULL;
+
+ if(A && B){
+ output=_vorbis_block_alloc(vb,sizeof(*output)*posts);
+
+ /* overly simpleminded--- look again post 1.2 */
+ for(i=0;i<posts;i++){
+ output[i]=((65536-del)*(A[i]&0x7fff)+del*(B[i]&0x7fff)+32768)>>16;
+ if(A[i]&0x8000 && B[i]&0x8000)output[i]|=0x8000;
+ }
+ }
+
+ return(output);
+}
+
+
+int floor1_encode(oggpack_buffer *opb,vorbis_block *vb,
+ vorbis_look_floor1 *look,
+ int *post,int *ilogmask){
+
+ long i,j;
+ vorbis_info_floor1 *info=look->vi;
+ long posts=look->posts;
+ codec_setup_info *ci=vb->vd->vi->codec_setup;
+ int out[VIF_POSIT+2];
+ static_codebook **sbooks=ci->book_param;
+ codebook *books=ci->fullbooks;
+
+ /* quantize values to multiplier spec */
+ if(post){
+ for(i=0;i<posts;i++){
+ int val=post[i]&0x7fff;
+ switch(info->mult){
+ case 1: /* 1024 -> 256 */
+ val>>=2;
+ break;
+ case 2: /* 1024 -> 128 */
+ val>>=3;
+ break;
+ case 3: /* 1024 -> 86 */
+ val/=12;
+ break;
+ case 4: /* 1024 -> 64 */
+ val>>=4;
+ break;
+ }
+ post[i]=val | (post[i]&0x8000);
+ }
+
+ out[0]=post[0];
+ out[1]=post[1];
+
+ /* find prediction values for each post and subtract them */
+ for(i=2;i<posts;i++){
+ int ln=look->loneighbor[i-2];
+ int hn=look->hineighbor[i-2];
+ int x0=info->postlist[ln];
+ int x1=info->postlist[hn];
+ int y0=post[ln];
+ int y1=post[hn];
+
+ int predicted=render_point(x0,x1,y0,y1,info->postlist[i]);
+
+ if((post[i]&0x8000) || (predicted==post[i])){
+ post[i]=predicted|0x8000; /* in case there was roundoff jitter
+ in interpolation */
+ out[i]=0;
+ }else{
+ int headroom=(look->quant_q-predicted<predicted?
+ look->quant_q-predicted:predicted);
+
+ int val=post[i]-predicted;
+
+ /* at this point the 'deviation' value is in the range +/- max
+ range, but the real, unique range can always be mapped to
+ only [0-maxrange). So we want to wrap the deviation into
+ this limited range, but do it in the way that least screws
+ an essentially gaussian probability distribution. */
+
+ if(val<0)
+ if(val<-headroom)
+ val=headroom-val-1;
+ else
+ val=-1-(val<<1);
+ else
+ if(val>=headroom)
+ val= val+headroom;
+ else
+ val<<=1;
+
+ out[i]=val;
+ post[ln]&=0x7fff;
+ post[hn]&=0x7fff;
+ }
+ }
+
+ /* we have everything we need. pack it out */
+ /* mark nontrivial floor */
+ oggpack_write(opb,1,1);
+
+ /* beginning/end post */
+ look->frames++;
+ look->postbits+=ilog(look->quant_q-1)*2;
+ oggpack_write(opb,out[0],ilog(look->quant_q-1));
+ oggpack_write(opb,out[1],ilog(look->quant_q-1));
+
+
+ /* partition by partition */
+ for(i=0,j=2;i<info->partitions;i++){
+ int class=info->partitionclass[i];
+ int cdim=info->class_dim[class];
+ int csubbits=info->class_subs[class];
+ int csub=1<<csubbits;
+ int bookas[8]={0,0,0,0,0,0,0,0};
+ int cval=0;
+ int cshift=0;
+ int k,l;
+
+ /* generate the partition's first stage cascade value */
+ if(csubbits){
+ int maxval[8];
+ for(k=0;k<csub;k++){
+ int booknum=info->class_subbook[class][k];
+ if(booknum<0){
+ maxval[k]=1;
+ }else{
+ maxval[k]=sbooks[info->class_subbook[class][k]]->entries;
+ }
+ }
+ for(k=0;k<cdim;k++){
+ for(l=0;l<csub;l++){
+ int val=out[j+k];
+ if(val<maxval[l]){
+ bookas[k]=l;
+ break;
+ }
+ }
+ cval|= bookas[k]<<cshift;
+ cshift+=csubbits;
+ }
+ /* write it */
+ look->phrasebits+=
+ vorbis_book_encode(books+info->class_book[class],cval,opb);
+
+#ifdef TRAIN_FLOOR1
+ {
+ FILE *of;
+ char buffer[80];
+ sprintf(buffer,"line_%dx%ld_class%d.vqd",
+ vb->pcmend/2,posts-2,class);
+ of=fopen(buffer,"a");
+ fprintf(of,"%d\n",cval);
+ fclose(of);
+ }
+#endif
+ }
+
+ /* write post values */
+ for(k=0;k<cdim;k++){
+ int book=info->class_subbook[class][bookas[k]];
+ if(book>=0){
+ /* hack to allow training with 'bad' books */
+ if(out[j+k]<(books+book)->entries)
+ look->postbits+=vorbis_book_encode(books+book,
+ out[j+k],opb);
+ /*else
+ fprintf(stderr,"+!");*/
+
+#ifdef TRAIN_FLOOR1
+ {
+ FILE *of;
+ char buffer[80];
+ sprintf(buffer,"line_%dx%ld_%dsub%d.vqd",
+ vb->pcmend/2,posts-2,class,bookas[k]);
+ of=fopen(buffer,"a");
+ fprintf(of,"%d\n",out[j+k]);
+ fclose(of);
+ }
+#endif
+ }
+ }
+ j+=cdim;
+ }
+
+ {
+ /* generate quantized floor equivalent to what we'd unpack in decode */
+ /* render the lines */
+ int hx=0;
+ int lx=0;
+ int ly=post[0]*info->mult;
+ int n=ci->blocksizes[vb->W]/2;
+
+ for(j=1;j<look->posts;j++){
+ int current=look->forward_index[j];
+ int hy=post[current]&0x7fff;
+ if(hy==post[current]){
+
+ hy*=info->mult;
+ hx=info->postlist[current];
+
+ render_line0(n,lx,hx,ly,hy,ilogmask);
+
+ lx=hx;
+ ly=hy;
+ }
+ }
+ for(j=hx;j<vb->pcmend/2;j++)ilogmask[j]=ly; /* be certain */
+ return(1);
+ }
+ }else{
+ oggpack_write(opb,0,1);
+ memset(ilogmask,0,vb->pcmend/2*sizeof(*ilogmask));
+ return(0);
+ }
+}
+
+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=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=_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 */
+ for(i=0,j=2;i<info->partitions;i++){
+ int class=info->partitionclass[i];
+ int cdim=info->class_dim[class];
+ int csubbits=info->class_subs[class];
+ 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[class],&vb->opb);
+
+ if(cval==-1)goto eop;
+ }
+
+ for(k=0;k<cdim;k++){
+ int book=info->class_subbook[class][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)&0x7fff;
+ 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,
+ float *out){
+ vorbis_look_floor1 *look=(vorbis_look_floor1 *)in;
+ vorbis_info_floor1 *info=look->vi;
+
+ codec_setup_info *ci=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;
+ /* guard lookup against out-of-range values */
+ ly=(ly<0?0:ly>255?255:ly);
+
+ for(j=1;j<look->posts;j++){
+ int current=look->forward_index[j];
+ int hy=fit_value[current]&0x7fff;
+ if(hy==fit_value[current]){
+
+ hx=info->postlist[current];
+ hy*=info->mult;
+ /* guard lookup against out-of-range values */
+ hy=(hy<0?0:hy>255?255:hy);
+
+ render_line(n,lx,hx,ly,hy,out);
+
+ lx=hx;
+ ly=hy;
+ }
+ }
+ for(j=hx;j<n;j++)out[j]*=FLOOR1_fromdB_LOOKUP[ly]; /* be certain */
+ return(1);
+ }
+ memset(out,0,sizeof(*out)*n);
+ return(0);
+}
+
+/* export hooks */
+const vorbis_func_floor floor1_exportbundle={
+ &floor1_pack,&floor1_unpack,&floor1_look,&floor1_free_info,
+ &floor1_free_look,&floor1_inverse1,&floor1_inverse2
+};
projects / laserbrain_demo / blobdiff