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+/********************************************************************
+ * *
+ * 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 1994-2010 *
+ * by the Xiph.Org Foundation http://www.xiph.org/ *
+ * *
+ ********************************************************************
+
+ function: psychoacoustics not including preecho
+
+ ********************************************************************/
+
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+#include "vorbis/codec.h"
+#include "codec_internal.h"
+
+#include "masking.h"
+#include "psy.h"
+#include "os.h"
+#include "lpc.h"
+#include "smallft.h"
+#include "scales.h"
+#include "misc.h"
+
+#define NEGINF -9999.f
+static const double stereo_threshholds[]={0.0, .5, 1.0, 1.5, 2.5, 4.5, 8.5, 16.5, 9e10};
+static const double stereo_threshholds_limited[]={0.0, .5, 1.0, 1.5, 2.0, 2.5, 4.5, 8.5, 9e10};
+
+vorbis_look_psy_global *_vp_global_look(vorbis_info *vi){
+ codec_setup_info *ci=vi->codec_setup;
+ vorbis_info_psy_global *gi=&ci->psy_g_param;
+ vorbis_look_psy_global *look=_ogg_calloc(1,sizeof(*look));
+
+ look->channels=vi->channels;
+
+ look->ampmax=-9999.;
+ look->gi=gi;
+ return(look);
+}
+
+void _vp_global_free(vorbis_look_psy_global *look){
+ if(look){
+ memset(look,0,sizeof(*look));
+ _ogg_free(look);
+ }
+}
+
+void _vi_gpsy_free(vorbis_info_psy_global *i){
+ if(i){
+ memset(i,0,sizeof(*i));
+ _ogg_free(i);
+ }
+}
+
+void _vi_psy_free(vorbis_info_psy *i){
+ if(i){
+ memset(i,0,sizeof(*i));
+ _ogg_free(i);
+ }
+}
+
+static void min_curve(float *c,
+ float *c2){
+ int i;
+ for(i=0;i<EHMER_MAX;i++)if(c2[i]<c[i])c[i]=c2[i];
+}
+static void max_curve(float *c,
+ float *c2){
+ int i;
+ for(i=0;i<EHMER_MAX;i++)if(c2[i]>c[i])c[i]=c2[i];
+}
+
+static void attenuate_curve(float *c,float att){
+ int i;
+ for(i=0;i<EHMER_MAX;i++)
+ c[i]+=att;
+}
+
+static float ***setup_tone_curves(float curveatt_dB[P_BANDS],float binHz,int n,
+ float center_boost, float center_decay_rate){
+ int i,j,k,m;
+ float ath[EHMER_MAX];
+ float workc[P_BANDS][P_LEVELS][EHMER_MAX];
+ float athc[P_LEVELS][EHMER_MAX];
+ float *brute_buffer=alloca(n*sizeof(*brute_buffer));
+
+ float ***ret=_ogg_malloc(sizeof(*ret)*P_BANDS);
+
+ memset(workc,0,sizeof(workc));
+
+ for(i=0;i<P_BANDS;i++){
+ /* we add back in the ATH to avoid low level curves falling off to
+ -infinity and unnecessarily cutting off high level curves in the
+ curve limiting (last step). */
+
+ /* A half-band's settings must be valid over the whole band, and
+ it's better to mask too little than too much */
+ int ath_offset=i*4;
+ for(j=0;j<EHMER_MAX;j++){
+ float min=999.;
+ for(k=0;k<4;k++)
+ if(j+k+ath_offset<MAX_ATH){
+ if(min>ATH[j+k+ath_offset])min=ATH[j+k+ath_offset];
+ }else{
+ if(min>ATH[MAX_ATH-1])min=ATH[MAX_ATH-1];
+ }
+ ath[j]=min;
+ }
+
+ /* copy curves into working space, replicate the 50dB curve to 30
+ and 40, replicate the 100dB curve to 110 */
+ for(j=0;j<6;j++)
+ memcpy(workc[i][j+2],tonemasks[i][j],EHMER_MAX*sizeof(*tonemasks[i][j]));
+ memcpy(workc[i][0],tonemasks[i][0],EHMER_MAX*sizeof(*tonemasks[i][0]));
+ memcpy(workc[i][1],tonemasks[i][0],EHMER_MAX*sizeof(*tonemasks[i][0]));
+
+ /* apply centered curve boost/decay */
+ for(j=0;j<P_LEVELS;j++){
+ for(k=0;k<EHMER_MAX;k++){
+ float adj=center_boost+abs(EHMER_OFFSET-k)*center_decay_rate;
+ if(adj<0. && center_boost>0)adj=0.;
+ if(adj>0. && center_boost<0)adj=0.;
+ workc[i][j][k]+=adj;
+ }
+ }
+
+ /* normalize curves so the driving amplitude is 0dB */
+ /* make temp curves with the ATH overlayed */
+ for(j=0;j<P_LEVELS;j++){
+ attenuate_curve(workc[i][j],curveatt_dB[i]+100.-(j<2?2:j)*10.-P_LEVEL_0);
+ memcpy(athc[j],ath,EHMER_MAX*sizeof(**athc));
+ attenuate_curve(athc[j],+100.-j*10.f-P_LEVEL_0);
+ max_curve(athc[j],workc[i][j]);
+ }
+
+ /* Now limit the louder curves.
+
+ the idea is this: We don't know what the playback attenuation
+ will be; 0dB SL moves every time the user twiddles the volume
+ knob. So that means we have to use a single 'most pessimal' curve
+ for all masking amplitudes, right? Wrong. The *loudest* sound
+ can be in (we assume) a range of ...+100dB] SL. However, sounds
+ 20dB down will be in a range ...+80], 40dB down is from ...+60],
+ etc... */
+
+ for(j=1;j<P_LEVELS;j++){
+ min_curve(athc[j],athc[j-1]);
+ min_curve(workc[i][j],athc[j]);
+ }
+ }
+
+ for(i=0;i<P_BANDS;i++){
+ int hi_curve,lo_curve,bin;
+ ret[i]=_ogg_malloc(sizeof(**ret)*P_LEVELS);
+
+ /* low frequency curves are measured with greater resolution than
+ the MDCT/FFT will actually give us; we want the curve applied
+ to the tone data to be pessimistic and thus apply the minimum
+ masking possible for a given bin. That means that a single bin
+ could span more than one octave and that the curve will be a
+ composite of multiple octaves. It also may mean that a single
+ bin may span > an eighth of an octave and that the eighth
+ octave values may also be composited. */
+
+ /* which octave curves will we be compositing? */
+ bin=floor(fromOC(i*.5)/binHz);
+ lo_curve= ceil(toOC(bin*binHz+1)*2);
+ hi_curve= floor(toOC((bin+1)*binHz)*2);
+ if(lo_curve>i)lo_curve=i;
+ if(lo_curve<0)lo_curve=0;
+ if(hi_curve>=P_BANDS)hi_curve=P_BANDS-1;
+
+ for(m=0;m<P_LEVELS;m++){
+ ret[i][m]=_ogg_malloc(sizeof(***ret)*(EHMER_MAX+2));
+
+ for(j=0;j<n;j++)brute_buffer[j]=999.;
+
+ /* render the curve into bins, then pull values back into curve.
+ The point is that any inherent subsampling aliasing results in
+ a safe minimum */
+ for(k=lo_curve;k<=hi_curve;k++){
+ int l=0;
+
+ for(j=0;j<EHMER_MAX;j++){
+ int lo_bin= fromOC(j*.125+k*.5-2.0625)/binHz;
+ int hi_bin= fromOC(j*.125+k*.5-1.9375)/binHz+1;
+
+ if(lo_bin<0)lo_bin=0;
+ if(lo_bin>n)lo_bin=n;
+ if(lo_bin<l)l=lo_bin;
+ if(hi_bin<0)hi_bin=0;
+ if(hi_bin>n)hi_bin=n;
+
+ for(;l<hi_bin && l<n;l++)
+ if(brute_buffer[l]>workc[k][m][j])
+ brute_buffer[l]=workc[k][m][j];
+ }
+
+ for(;l<n;l++)
+ if(brute_buffer[l]>workc[k][m][EHMER_MAX-1])
+ brute_buffer[l]=workc[k][m][EHMER_MAX-1];
+
+ }
+
+ /* be equally paranoid about being valid up to next half ocatve */
+ if(i+1<P_BANDS){
+ int l=0;
+ k=i+1;
+ for(j=0;j<EHMER_MAX;j++){
+ int lo_bin= fromOC(j*.125+i*.5-2.0625)/binHz;
+ int hi_bin= fromOC(j*.125+i*.5-1.9375)/binHz+1;
+
+ if(lo_bin<0)lo_bin=0;
+ if(lo_bin>n)lo_bin=n;
+ if(lo_bin<l)l=lo_bin;
+ if(hi_bin<0)hi_bin=0;
+ if(hi_bin>n)hi_bin=n;
+
+ for(;l<hi_bin && l<n;l++)
+ if(brute_buffer[l]>workc[k][m][j])
+ brute_buffer[l]=workc[k][m][j];
+ }
+
+ for(;l<n;l++)
+ if(brute_buffer[l]>workc[k][m][EHMER_MAX-1])
+ brute_buffer[l]=workc[k][m][EHMER_MAX-1];
+
+ }
+
+
+ for(j=0;j<EHMER_MAX;j++){
+ int bin=fromOC(j*.125+i*.5-2.)/binHz;
+ if(bin<0){
+ ret[i][m][j+2]=-999.;
+ }else{
+ if(bin>=n){
+ ret[i][m][j+2]=-999.;
+ }else{
+ ret[i][m][j+2]=brute_buffer[bin];
+ }
+ }
+ }
+
+ /* add fenceposts */
+ for(j=0;j<EHMER_OFFSET;j++)
+ if(ret[i][m][j+2]>-200.f)break;
+ ret[i][m][0]=j;
+
+ for(j=EHMER_MAX-1;j>EHMER_OFFSET+1;j--)
+ if(ret[i][m][j+2]>-200.f)
+ break;
+ ret[i][m][1]=j;
+
+ }
+ }
+
+ return(ret);
+}
+
+void _vp_psy_init(vorbis_look_psy *p,vorbis_info_psy *vi,
+ vorbis_info_psy_global *gi,int n,long rate){
+ long i,j,lo=-99,hi=1;
+ long maxoc;
+ memset(p,0,sizeof(*p));
+
+ p->eighth_octave_lines=gi->eighth_octave_lines;
+ p->shiftoc=rint(log(gi->eighth_octave_lines*8.f)/log(2.f))-1;
+
+ p->firstoc=toOC(.25f*rate*.5/n)*(1<<(p->shiftoc+1))-gi->eighth_octave_lines;
+ maxoc=toOC((n+.25f)*rate*.5/n)*(1<<(p->shiftoc+1))+.5f;
+ p->total_octave_lines=maxoc-p->firstoc+1;
+ p->ath=_ogg_malloc(n*sizeof(*p->ath));
+
+ p->octave=_ogg_malloc(n*sizeof(*p->octave));
+ p->bark=_ogg_malloc(n*sizeof(*p->bark));
+ p->vi=vi;
+ p->n=n;
+ p->rate=rate;
+
+ /* AoTuV HF weighting */
+ p->m_val = 1.;
+ if(rate < 26000) p->m_val = 0;
+ else if(rate < 38000) p->m_val = .94; /* 32kHz */
+ else if(rate > 46000) p->m_val = 1.275; /* 48kHz */
+
+ /* set up the lookups for a given blocksize and sample rate */
+
+ for(i=0,j=0;i<MAX_ATH-1;i++){
+ int endpos=rint(fromOC((i+1)*.125-2.)*2*n/rate);
+ float base=ATH[i];
+ if(j<endpos){
+ float delta=(ATH[i+1]-base)/(endpos-j);
+ for(;j<endpos && j<n;j++){
+ p->ath[j]=base+100.;
+ base+=delta;
+ }
+ }
+ }
+
+ for(;j<n;j++){
+ p->ath[j]=p->ath[j-1];
+ }
+
+ for(i=0;i<n;i++){
+ float bark=toBARK(rate/(2*n)*i);
+
+ for(;lo+vi->noisewindowlomin<i &&
+ toBARK(rate/(2*n)*lo)<(bark-vi->noisewindowlo);lo++);
+
+ for(;hi<=n && (hi<i+vi->noisewindowhimin ||
+ toBARK(rate/(2*n)*hi)<(bark+vi->noisewindowhi));hi++);
+
+ p->bark[i]=((lo-1)<<16)+(hi-1);
+
+ }
+
+ for(i=0;i<n;i++)
+ p->octave[i]=toOC((i+.25f)*.5*rate/n)*(1<<(p->shiftoc+1))+.5f;
+
+ p->tonecurves=setup_tone_curves(vi->toneatt,rate*.5/n,n,
+ vi->tone_centerboost,vi->tone_decay);
+
+ /* set up rolling noise median */
+ p->noiseoffset=_ogg_malloc(P_NOISECURVES*sizeof(*p->noiseoffset));
+ for(i=0;i<P_NOISECURVES;i++)
+ p->noiseoffset[i]=_ogg_malloc(n*sizeof(**p->noiseoffset));
+
+ for(i=0;i<n;i++){
+ float halfoc=toOC((i+.5)*rate/(2.*n))*2.;
+ int inthalfoc;
+ float del;
+
+ if(halfoc<0)halfoc=0;
+ if(halfoc>=P_BANDS-1)halfoc=P_BANDS-1;
+ inthalfoc=(int)halfoc;
+ del=halfoc-inthalfoc;
+
+ for(j=0;j<P_NOISECURVES;j++)
+ p->noiseoffset[j][i]=
+ p->vi->noiseoff[j][inthalfoc]*(1.-del) +
+ p->vi->noiseoff[j][inthalfoc+1]*del;
+
+ }
+#if 0
+ {
+ static int ls=0;
+ _analysis_output_always("noiseoff0",ls,p->noiseoffset[0],n,1,0,0);
+ _analysis_output_always("noiseoff1",ls,p->noiseoffset[1],n,1,0,0);
+ _analysis_output_always("noiseoff2",ls++,p->noiseoffset[2],n,1,0,0);
+ }
+#endif
+}
+
+void _vp_psy_clear(vorbis_look_psy *p){
+ int i,j;
+ if(p){
+ if(p->ath)_ogg_free(p->ath);
+ if(p->octave)_ogg_free(p->octave);
+ if(p->bark)_ogg_free(p->bark);
+ if(p->tonecurves){
+ for(i=0;i<P_BANDS;i++){
+ for(j=0;j<P_LEVELS;j++){
+ _ogg_free(p->tonecurves[i][j]);
+ }
+ _ogg_free(p->tonecurves[i]);
+ }
+ _ogg_free(p->tonecurves);
+ }
+ if(p->noiseoffset){
+ for(i=0;i<P_NOISECURVES;i++){
+ _ogg_free(p->noiseoffset[i]);
+ }
+ _ogg_free(p->noiseoffset);
+ }
+ memset(p,0,sizeof(*p));
+ }
+}
+
+/* octave/(8*eighth_octave_lines) x scale and dB y scale */
+static void seed_curve(float *seed,
+ const float **curves,
+ float amp,
+ int oc, int n,
+ int linesper,float dBoffset){
+ int i,post1;
+ int seedptr;
+ const float *posts,*curve;
+
+ int choice=(int)((amp+dBoffset-P_LEVEL_0)*.1f);
+ choice=max(choice,0);
+ choice=min(choice,P_LEVELS-1);
+ posts=curves[choice];
+ curve=posts+2;
+ post1=(int)posts[1];
+ seedptr=oc+(posts[0]-EHMER_OFFSET)*linesper-(linesper>>1);
+
+ for(i=posts[0];i<post1;i++){
+ if(seedptr>0){
+ float lin=amp+curve[i];
+ if(seed[seedptr]<lin)seed[seedptr]=lin;
+ }
+ seedptr+=linesper;
+ if(seedptr>=n)break;
+ }
+}
+
+static void seed_loop(vorbis_look_psy *p,
+ const float ***curves,
+ const float *f,
+ const float *flr,
+ float *seed,
+ float specmax){
+ vorbis_info_psy *vi=p->vi;
+ long n=p->n,i;
+ float dBoffset=vi->max_curve_dB-specmax;
+
+ /* prime the working vector with peak values */
+
+ for(i=0;i<n;i++){
+ float max=f[i];
+ long oc=p->octave[i];
+ while(i+1<n && p->octave[i+1]==oc){
+ i++;
+ if(f[i]>max)max=f[i];
+ }
+
+ if(max+6.f>flr[i]){
+ oc=oc>>p->shiftoc;
+
+ if(oc>=P_BANDS)oc=P_BANDS-1;
+ if(oc<0)oc=0;
+
+ seed_curve(seed,
+ curves[oc],
+ max,
+ p->octave[i]-p->firstoc,
+ p->total_octave_lines,
+ p->eighth_octave_lines,
+ dBoffset);
+ }
+ }
+}
+
+static void seed_chase(float *seeds, int linesper, long n){
+ long *posstack=alloca(n*sizeof(*posstack));
+ float *ampstack=alloca(n*sizeof(*ampstack));
+ long stack=0;
+ long pos=0;
+ long i;
+
+ for(i=0;i<n;i++){
+ if(stack<2){
+ posstack[stack]=i;
+ ampstack[stack++]=seeds[i];
+ }else{
+ while(1){
+ if(seeds[i]<ampstack[stack-1]){
+ posstack[stack]=i;
+ ampstack[stack++]=seeds[i];
+ break;
+ }else{
+ if(i<posstack[stack-1]+linesper){
+ if(stack>1 && ampstack[stack-1]<=ampstack[stack-2] &&
+ i<posstack[stack-2]+linesper){
+ /* we completely overlap, making stack-1 irrelevant. pop it */
+ stack--;
+ continue;
+ }
+ }
+ posstack[stack]=i;
+ ampstack[stack++]=seeds[i];
+ break;
+
+ }
+ }
+ }
+ }
+
+ /* the stack now contains only the positions that are relevant. Scan
+ 'em straight through */
+
+ for(i=0;i<stack;i++){
+ long endpos;
+ if(i<stack-1 && ampstack[i+1]>ampstack[i]){
+ endpos=posstack[i+1];
+ }else{
+ endpos=posstack[i]+linesper+1; /* +1 is important, else bin 0 is
+ discarded in short frames */
+ }
+ if(endpos>n)endpos=n;
+ for(;pos<endpos;pos++)
+ seeds[pos]=ampstack[i];
+ }
+
+ /* there. Linear time. I now remember this was on a problem set I
+ had in Grad Skool... I didn't solve it at the time ;-) */
+
+}
+
+/* bleaugh, this is more complicated than it needs to be */
+#include<stdio.h>
+static void max_seeds(vorbis_look_psy *p,
+ float *seed,
+ float *flr){
+ long n=p->total_octave_lines;
+ int linesper=p->eighth_octave_lines;
+ long linpos=0;
+ long pos;
+
+ seed_chase(seed,linesper,n); /* for masking */
+
+ pos=p->octave[0]-p->firstoc-(linesper>>1);
+
+ while(linpos+1<p->n){
+ float minV=seed[pos];
+ long end=((p->octave[linpos]+p->octave[linpos+1])>>1)-p->firstoc;
+ if(minV>p->vi->tone_abs_limit)minV=p->vi->tone_abs_limit;
+ while(pos+1<=end){
+ pos++;
+ if((seed[pos]>NEGINF && seed[pos]<minV) || minV==NEGINF)
+ minV=seed[pos];
+ }
+
+ end=pos+p->firstoc;
+ for(;linpos<p->n && p->octave[linpos]<=end;linpos++)
+ if(flr[linpos]<minV)flr[linpos]=minV;
+ }
+
+ {
+ float minV=seed[p->total_octave_lines-1];
+ for(;linpos<p->n;linpos++)
+ if(flr[linpos]<minV)flr[linpos]=minV;
+ }
+
+}
+
+static void bark_noise_hybridmp(int n,const long *b,
+ const float *f,
+ float *noise,
+ const float offset,
+ const int fixed){
+
+ float *N=alloca(n*sizeof(*N));
+ float *X=alloca(n*sizeof(*N));
+ float *XX=alloca(n*sizeof(*N));
+ float *Y=alloca(n*sizeof(*N));
+ float *XY=alloca(n*sizeof(*N));
+
+ float tN, tX, tXX, tY, tXY;
+ int i;
+
+ int lo, hi;
+ float R=0.f;
+ float A=0.f;
+ float B=0.f;
+ float D=1.f;
+ float w, x, y;
+
+ tN = tX = tXX = tY = tXY = 0.f;
+
+ y = f[0] + offset;
+ if (y < 1.f) y = 1.f;
+
+ w = y * y * .5;
+
+ tN += w;
+ tX += w;
+ tY += w * y;
+
+ N[0] = tN;
+ X[0] = tX;
+ XX[0] = tXX;
+ Y[0] = tY;
+ XY[0] = tXY;
+
+ for (i = 1, x = 1.f; i < n; i++, x += 1.f) {
+
+ y = f[i] + offset;
+ if (y < 1.f) y = 1.f;
+
+ w = y * y;
+
+ tN += w;
+ tX += w * x;
+ tXX += w * x * x;
+ tY += w * y;
+ tXY += w * x * y;
+
+ N[i] = tN;
+ X[i] = tX;
+ XX[i] = tXX;
+ Y[i] = tY;
+ XY[i] = tXY;
+ }
+
+ for (i = 0, x = 0.f;; i++, x += 1.f) {
+
+ lo = b[i] >> 16;
+ if( lo>=0 ) break;
+ hi = b[i] & 0xffff;
+
+ tN = N[hi] + N[-lo];
+ tX = X[hi] - X[-lo];
+ tXX = XX[hi] + XX[-lo];
+ tY = Y[hi] + Y[-lo];
+ tXY = XY[hi] - XY[-lo];
+
+ A = tY * tXX - tX * tXY;
+ B = tN * tXY - tX * tY;
+ D = tN * tXX - tX * tX;
+ R = (A + x * B) / D;
+ if (R < 0.f)
+ R = 0.f;
+
+ noise[i] = R - offset;
+ }
+
+ for ( ;; i++, x += 1.f) {
+
+ lo = b[i] >> 16;
+ hi = b[i] & 0xffff;
+ if(hi>=n)break;
+
+ tN = N[hi] - N[lo];
+ tX = X[hi] - X[lo];
+ tXX = XX[hi] - XX[lo];
+ tY = Y[hi] - Y[lo];
+ tXY = XY[hi] - XY[lo];
+
+ A = tY * tXX - tX * tXY;
+ B = tN * tXY - tX * tY;
+ D = tN * tXX - tX * tX;
+ R = (A + x * B) / D;
+ if (R < 0.f) R = 0.f;
+
+ noise[i] = R - offset;
+ }
+ for ( ; i < n; i++, x += 1.f) {
+
+ R = (A + x * B) / D;
+ if (R < 0.f) R = 0.f;
+
+ noise[i] = R - offset;
+ }
+
+ if (fixed <= 0) return;
+
+ for (i = 0, x = 0.f;; i++, x += 1.f) {
+ hi = i + fixed / 2;
+ lo = hi - fixed;
+ if(lo>=0)break;
+
+ tN = N[hi] + N[-lo];
+ tX = X[hi] - X[-lo];
+ tXX = XX[hi] + XX[-lo];
+ tY = Y[hi] + Y[-lo];
+ tXY = XY[hi] - XY[-lo];
+
+
+ A = tY * tXX - tX * tXY;
+ B = tN * tXY - tX * tY;
+ D = tN * tXX - tX * tX;
+ R = (A + x * B) / D;
+
+ if (R - offset < noise[i]) noise[i] = R - offset;
+ }
+ for ( ;; i++, x += 1.f) {
+
+ hi = i + fixed / 2;
+ lo = hi - fixed;
+ if(hi>=n)break;
+
+ tN = N[hi] - N[lo];
+ tX = X[hi] - X[lo];
+ tXX = XX[hi] - XX[lo];
+ tY = Y[hi] - Y[lo];
+ tXY = XY[hi] - XY[lo];
+
+ A = tY * tXX - tX * tXY;
+ B = tN * tXY - tX * tY;
+ D = tN * tXX - tX * tX;
+ R = (A + x * B) / D;
+
+ if (R - offset < noise[i]) noise[i] = R - offset;
+ }
+ for ( ; i < n; i++, x += 1.f) {
+ R = (A + x * B) / D;
+ if (R - offset < noise[i]) noise[i] = R - offset;
+ }
+}
+
+void _vp_noisemask(vorbis_look_psy *p,
+ float *logmdct,
+ float *logmask){
+
+ int i,n=p->n;
+ float *work=alloca(n*sizeof(*work));
+
+ bark_noise_hybridmp(n,p->bark,logmdct,logmask,
+ 140.,-1);
+
+ for(i=0;i<n;i++)work[i]=logmdct[i]-logmask[i];
+
+ bark_noise_hybridmp(n,p->bark,work,logmask,0.,
+ p->vi->noisewindowfixed);
+
+ for(i=0;i<n;i++)work[i]=logmdct[i]-work[i];
+
+#if 0
+ {
+ static int seq=0;
+
+ float work2[n];
+ for(i=0;i<n;i++){
+ work2[i]=logmask[i]+work[i];
+ }
+
+ if(seq&1)
+ _analysis_output("median2R",seq/2,work,n,1,0,0);
+ else
+ _analysis_output("median2L",seq/2,work,n,1,0,0);
+
+ if(seq&1)
+ _analysis_output("envelope2R",seq/2,work2,n,1,0,0);
+ else
+ _analysis_output("envelope2L",seq/2,work2,n,1,0,0);
+ seq++;
+ }
+#endif
+
+ for(i=0;i<n;i++){
+ int dB=logmask[i]+.5;
+ if(dB>=NOISE_COMPAND_LEVELS)dB=NOISE_COMPAND_LEVELS-1;
+ if(dB<0)dB=0;
+ logmask[i]= work[i]+p->vi->noisecompand[dB];
+ }
+
+}
+
+void _vp_tonemask(vorbis_look_psy *p,
+ float *logfft,
+ float *logmask,
+ float global_specmax,
+ float local_specmax){
+
+ int i,n=p->n;
+
+ float *seed=alloca(sizeof(*seed)*p->total_octave_lines);
+ float att=local_specmax+p->vi->ath_adjatt;
+ for(i=0;i<p->total_octave_lines;i++)seed[i]=NEGINF;
+
+ /* set the ATH (floating below localmax, not global max by a
+ specified att) */
+ if(att<p->vi->ath_maxatt)att=p->vi->ath_maxatt;
+
+ for(i=0;i<n;i++)
+ logmask[i]=p->ath[i]+att;
+
+ /* tone masking */
+ seed_loop(p,(const float ***)p->tonecurves,logfft,logmask,seed,global_specmax);
+ max_seeds(p,seed,logmask);
+
+}
+
+void _vp_offset_and_mix(vorbis_look_psy *p,
+ float *noise,
+ float *tone,
+ int offset_select,
+ float *logmask,
+ float *mdct,
+ float *logmdct){
+ int i,n=p->n;
+ float de, coeffi, cx;/* AoTuV */
+ float toneatt=p->vi->tone_masteratt[offset_select];
+
+ cx = p->m_val;
+
+ for(i=0;i<n;i++){
+ float val= noise[i]+p->noiseoffset[offset_select][i];
+ if(val>p->vi->noisemaxsupp)val=p->vi->noisemaxsupp;
+ logmask[i]=max(val,tone[i]+toneatt);
+
+
+ /* AoTuV */
+ /** @ M1 **
+ The following codes improve a noise problem.
+ A fundamental idea uses the value of masking and carries out
+ the relative compensation of the MDCT.
+ However, this code is not perfect and all noise problems cannot be solved.
+ by Aoyumi @ 2004/04/18
+ */
+
+ if(offset_select == 1) {
+ coeffi = -17.2; /* coeffi is a -17.2dB threshold */
+ val = val - logmdct[i]; /* val == mdct line value relative to floor in dB */
+
+ if(val > coeffi){
+ /* mdct value is > -17.2 dB below floor */
+
+ de = 1.0-((val-coeffi)*0.005*cx);
+ /* pro-rated attenuation:
+ -0.00 dB boost if mdct value is -17.2dB (relative to floor)
+ -0.77 dB boost if mdct value is 0dB (relative to floor)
+ -1.64 dB boost if mdct value is +17.2dB (relative to floor)
+ etc... */
+
+ if(de < 0) de = 0.0001;
+ }else
+ /* mdct value is <= -17.2 dB below floor */
+
+ de = 1.0-((val-coeffi)*0.0003*cx);
+ /* pro-rated attenuation:
+ +0.00 dB atten if mdct value is -17.2dB (relative to floor)
+ +0.45 dB atten if mdct value is -34.4dB (relative to floor)
+ etc... */
+
+ mdct[i] *= de;
+
+ }
+ }
+}
+
+float _vp_ampmax_decay(float amp,vorbis_dsp_state *vd){
+ vorbis_info *vi=vd->vi;
+ codec_setup_info *ci=vi->codec_setup;
+ vorbis_info_psy_global *gi=&ci->psy_g_param;
+
+ int n=ci->blocksizes[vd->W]/2;
+ float secs=(float)n/vi->rate;
+
+ amp+=secs*gi->ampmax_att_per_sec;
+ if(amp<-9999)amp=-9999;
+ return(amp);
+}
+
+static 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,
+};
+
+/* this is for per-channel noise normalization */
+static int apsort(const void *a, const void *b){
+ float f1=**(float**)a;
+ float f2=**(float**)b;
+ return (f1<f2)-(f1>f2);
+}
+
+static void flag_lossless(int limit, float prepoint, float postpoint, float *mdct,
+ float *floor, int *flag, int i, int jn){
+ int j;
+ for(j=0;j<jn;j++){
+ float point = j>=limit-i ? postpoint : prepoint;
+ float r = fabs(mdct[j])/floor[j];
+ if(r<point)
+ flag[j]=0;
+ else
+ flag[j]=1;
+ }
+}
+
+/* Overload/Side effect: On input, the *q vector holds either the
+ quantized energy (for elements with the flag set) or the absolute
+ values of the *r vector (for elements with flag unset). On output,
+ *q holds the quantized energy for all elements */
+static float noise_normalize(vorbis_look_psy *p, int limit, float *r, float *q, float *f, int *flags, float acc, int i, int n, int *out){
+
+ vorbis_info_psy *vi=p->vi;
+ float **sort = alloca(n*sizeof(*sort));
+ int j,count=0;
+ int start = (vi->normal_p ? vi->normal_start-i : n);
+ if(start>n)start=n;
+
+ /* force classic behavior where only energy in the current band is considered */
+ acc=0.f;
+
+ /* still responsible for populating *out where noise norm not in
+ effect. There's no need to [re]populate *q in these areas */
+ for(j=0;j<start;j++){
+ if(!flags || !flags[j]){ /* lossless coupling already quantized.
+ Don't touch; requantizing based on
+ energy would be incorrect. */
+ float ve = q[j]/f[j];
+ if(r[j]<0)
+ out[j] = -rint(sqrt(ve));
+ else
+ out[j] = rint(sqrt(ve));
+ }
+ }
+
+ /* sort magnitudes for noise norm portion of partition */
+ for(;j<n;j++){
+ if(!flags || !flags[j]){ /* can't noise norm elements that have
+ already been loslessly coupled; we can
+ only account for their energy error */
+ float ve = q[j]/f[j];
+ /* Despite all the new, more capable coupling code, for now we
+ implement noise norm as it has been up to this point. Only
+ consider promotions to unit magnitude from 0. In addition
+ the only energy error counted is quantizations to zero. */
+ /* also-- the original point code only applied noise norm at > pointlimit */
+ if(ve<.25f && (!flags || j>=limit-i)){
+ acc += ve;
+ sort[count++]=q+j; /* q is fabs(r) for unflagged element */
+ }else{
+ /* For now: no acc adjustment for nonzero quantization. populate *out and q as this value is final. */
+ if(r[j]<0)
+ out[j] = -rint(sqrt(ve));
+ else
+ out[j] = rint(sqrt(ve));
+ q[j] = out[j]*out[j]*f[j];
+ }
+ }/* else{
+ again, no energy adjustment for error in nonzero quant-- for now
+ }*/
+ }
+
+ if(count){
+ /* noise norm to do */
+ qsort(sort,count,sizeof(*sort),apsort);
+ for(j=0;j<count;j++){
+ int k=sort[j]-q;
+ if(acc>=vi->normal_thresh){
+ out[k]=unitnorm(r[k]);
+ acc-=1.f;
+ q[k]=f[k];
+ }else{
+ out[k]=0;
+ q[k]=0.f;
+ }
+ }
+ }
+
+ return acc;
+}
+
+/* Noise normalization, quantization and coupling are not wholly
+ seperable processes in depth>1 coupling. */
+void _vp_couple_quantize_normalize(int blobno,
+ vorbis_info_psy_global *g,
+ vorbis_look_psy *p,
+ vorbis_info_mapping0 *vi,
+ float **mdct,
+ int **iwork,
+ int *nonzero,
+ int sliding_lowpass,
+ int ch){
+
+ int i;
+ int n = p->n;
+ int partition=(p->vi->normal_p ? p->vi->normal_partition : 16);
+ int limit = g->coupling_pointlimit[p->vi->blockflag][blobno];
+ float prepoint=stereo_threshholds[g->coupling_prepointamp[blobno]];
+ float postpoint=stereo_threshholds[g->coupling_postpointamp[blobno]];
+#if 0
+ float de=0.1*p->m_val; /* a blend of the AoTuV M2 and M3 code here and below */
+#endif
+
+ /* mdct is our raw mdct output, floor not removed. */
+ /* inout passes in the ifloor, passes back quantized result */
+
+ /* unquantized energy (negative indicates amplitude has negative sign) */
+ float **raw = alloca(ch*sizeof(*raw));
+
+ /* dual pupose; quantized energy (if flag set), othersize fabs(raw) */
+ float **quant = alloca(ch*sizeof(*quant));
+
+ /* floor energy */
+ float **floor = alloca(ch*sizeof(*floor));
+
+ /* flags indicating raw/quantized status of elements in raw vector */
+ int **flag = alloca(ch*sizeof(*flag));
+
+ /* non-zero flag working vector */
+ int *nz = alloca(ch*sizeof(*nz));
+
+ /* energy surplus/defecit tracking */
+ float *acc = alloca((ch+vi->coupling_steps)*sizeof(*acc));
+
+ /* The threshold of a stereo is changed with the size of n */
+ if(n > 1000)
+ postpoint=stereo_threshholds_limited[g->coupling_postpointamp[blobno]];
+
+ raw[0] = alloca(ch*partition*sizeof(**raw));
+ quant[0] = alloca(ch*partition*sizeof(**quant));
+ floor[0] = alloca(ch*partition*sizeof(**floor));
+ flag[0] = alloca(ch*partition*sizeof(**flag));
+
+ for(i=1;i<ch;i++){
+ raw[i] = &raw[0][partition*i];
+ quant[i] = &quant[0][partition*i];
+ floor[i] = &floor[0][partition*i];
+ flag[i] = &flag[0][partition*i];
+ }
+ for(i=0;i<ch+vi->coupling_steps;i++)
+ acc[i]=0.f;
+
+ for(i=0;i<n;i+=partition){
+ int k,j,jn = partition > n-i ? n-i : partition;
+ int step,track = 0;
+
+ memcpy(nz,nonzero,sizeof(*nz)*ch);
+
+ /* prefill */
+ memset(flag[0],0,ch*partition*sizeof(**flag));
+ for(k=0;k<ch;k++){
+ int *iout = &iwork[k][i];
+ if(nz[k]){
+
+ for(j=0;j<jn;j++)
+ floor[k][j] = FLOOR1_fromdB_LOOKUP[iout[j]];
+
+ flag_lossless(limit,prepoint,postpoint,&mdct[k][i],floor[k],flag[k],i,jn);
+
+ for(j=0;j<jn;j++){
+ quant[k][j] = raw[k][j] = mdct[k][i+j]*mdct[k][i+j];
+ if(mdct[k][i+j]<0.f) raw[k][j]*=-1.f;
+ floor[k][j]*=floor[k][j];
+ }
+
+ acc[track]=noise_normalize(p,limit,raw[k],quant[k],floor[k],NULL,acc[track],i,jn,iout);
+
+ }else{
+ for(j=0;j<jn;j++){
+ floor[k][j] = 1e-10f;
+ raw[k][j] = 0.f;
+ quant[k][j] = 0.f;
+ flag[k][j] = 0;
+ iout[j]=0;
+ }
+ acc[track]=0.f;
+ }
+ track++;
+ }
+
+ /* coupling */
+ for(step=0;step<vi->coupling_steps;step++){
+ int Mi = vi->coupling_mag[step];
+ int Ai = vi->coupling_ang[step];
+ int *iM = &iwork[Mi][i];
+ int *iA = &iwork[Ai][i];
+ float *reM = raw[Mi];
+ float *reA = raw[Ai];
+ float *qeM = quant[Mi];
+ float *qeA = quant[Ai];
+ float *floorM = floor[Mi];
+ float *floorA = floor[Ai];
+ int *fM = flag[Mi];
+ int *fA = flag[Ai];
+
+ if(nz[Mi] || nz[Ai]){
+ nz[Mi] = nz[Ai] = 1;
+
+ for(j=0;j<jn;j++){
+
+ if(j<sliding_lowpass-i){
+ if(fM[j] || fA[j]){
+ /* lossless coupling */
+
+ reM[j] = fabs(reM[j])+fabs(reA[j]);
+ qeM[j] = qeM[j]+qeA[j];
+ fM[j]=fA[j]=1;
+
+ /* couple iM/iA */
+ {
+ int A = iM[j];
+ int B = iA[j];
+
+ if(abs(A)>abs(B)){
+ iA[j]=(A>0?A-B:B-A);
+ }else{
+ iA[j]=(B>0?A-B:B-A);
+ iM[j]=B;
+ }
+
+ /* collapse two equivalent tuples to one */
+ if(iA[j]>=abs(iM[j])*2){
+ iA[j]= -iA[j];
+ iM[j]= -iM[j];
+ }
+
+ }
+
+ }else{
+ /* lossy (point) coupling */
+ if(j<limit-i){
+ /* dipole */
+ reM[j] += reA[j];
+ qeM[j] = fabs(reM[j]);
+ }else{
+#if 0
+ /* AoTuV */
+ /** @ M2 **
+ The boost problem by the combination of noise normalization and point stereo is eased.
+ However, this is a temporary patch.
+ by Aoyumi @ 2004/04/18
+ */
+ float derate = (1.0 - de*((float)(j-limit+i) / (float)(n-limit)));
+ /* elliptical */
+ if(reM[j]+reA[j]<0){
+ reM[j] = - (qeM[j] = (fabs(reM[j])+fabs(reA[j]))*derate*derate);
+ }else{
+ reM[j] = (qeM[j] = (fabs(reM[j])+fabs(reA[j]))*derate*derate);
+ }
+#else
+ /* elliptical */
+ if(reM[j]+reA[j]<0){
+ reM[j] = - (qeM[j] = fabs(reM[j])+fabs(reA[j]));
+ }else{
+ reM[j] = (qeM[j] = fabs(reM[j])+fabs(reA[j]));
+ }
+#endif
+
+ }
+ reA[j]=qeA[j]=0.f;
+ fA[j]=1;
+ iA[j]=0;
+ }
+ }
+ floorM[j]=floorA[j]=floorM[j]+floorA[j];
+ }
+ /* normalize the resulting mag vector */
+ acc[track]=noise_normalize(p,limit,raw[Mi],quant[Mi],floor[Mi],flag[Mi],acc[track],i,jn,iM);
+ track++;
+ }
+ }
+ }
+
+ for(i=0;i<vi->coupling_steps;i++){
+ /* make sure coupling a zero and a nonzero channel results in two
+ nonzero channels. */
+ if(nonzero[vi->coupling_mag[i]] ||
+ nonzero[vi->coupling_ang[i]]){
+ nonzero[vi->coupling_mag[i]]=1;
+ nonzero[vi->coupling_ang[i]]=1;
+ }
+ }
+}
generated by cgit v1.1 at 2024-05-18 20:41:16 +0000