1 /********************************************************************
3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2010 *
9 * by the Xiph.Org Foundation http://www.xiph.org/ *
11 ********************************************************************
13 function: psychoacoustics not including preecho
15 ********************************************************************/
20 #include "vorbis/codec.h"
21 #include "codec_internal.h"
31 #define NEGINF -9999.f
32 static const double stereo_threshholds[]={0.0, .5, 1.0, 1.5, 2.5, 4.5, 8.5, 16.5, 9e10};
33 static const double stereo_threshholds_limited[]={0.0, .5, 1.0, 1.5, 2.0, 2.5, 4.5, 8.5, 9e10};
35 vorbis_look_psy_global *_vp_global_look(vorbis_info *vi){
36 codec_setup_info *ci=vi->codec_setup;
37 vorbis_info_psy_global *gi=&ci->psy_g_param;
38 vorbis_look_psy_global *look=_ogg_calloc(1,sizeof(*look));
40 look->channels=vi->channels;
47 void _vp_global_free(vorbis_look_psy_global *look){
49 memset(look,0,sizeof(*look));
54 void _vi_gpsy_free(vorbis_info_psy_global *i){
56 memset(i,0,sizeof(*i));
61 void _vi_psy_free(vorbis_info_psy *i){
63 memset(i,0,sizeof(*i));
68 static void min_curve(float *c,
71 for(i=0;i<EHMER_MAX;i++)if(c2[i]<c[i])c[i]=c2[i];
73 static void max_curve(float *c,
76 for(i=0;i<EHMER_MAX;i++)if(c2[i]>c[i])c[i]=c2[i];
79 static void attenuate_curve(float *c,float att){
81 for(i=0;i<EHMER_MAX;i++)
85 static float ***setup_tone_curves(float curveatt_dB[P_BANDS],float binHz,int n,
86 float center_boost, float center_decay_rate){
89 float workc[P_BANDS][P_LEVELS][EHMER_MAX];
90 float athc[P_LEVELS][EHMER_MAX];
91 float *brute_buffer=alloca(n*sizeof(*brute_buffer));
93 float ***ret=_ogg_malloc(sizeof(*ret)*P_BANDS);
95 memset(workc,0,sizeof(workc));
97 for(i=0;i<P_BANDS;i++){
98 /* we add back in the ATH to avoid low level curves falling off to
99 -infinity and unnecessarily cutting off high level curves in the
100 curve limiting (last step). */
102 /* A half-band's settings must be valid over the whole band, and
103 it's better to mask too little than too much */
105 for(j=0;j<EHMER_MAX;j++){
108 if(j+k+ath_offset<MAX_ATH){
109 if(min>ATH[j+k+ath_offset])min=ATH[j+k+ath_offset];
111 if(min>ATH[MAX_ATH-1])min=ATH[MAX_ATH-1];
116 /* copy curves into working space, replicate the 50dB curve to 30
117 and 40, replicate the 100dB curve to 110 */
119 memcpy(workc[i][j+2],tonemasks[i][j],EHMER_MAX*sizeof(*tonemasks[i][j]));
120 memcpy(workc[i][0],tonemasks[i][0],EHMER_MAX*sizeof(*tonemasks[i][0]));
121 memcpy(workc[i][1],tonemasks[i][0],EHMER_MAX*sizeof(*tonemasks[i][0]));
123 /* apply centered curve boost/decay */
124 for(j=0;j<P_LEVELS;j++){
125 for(k=0;k<EHMER_MAX;k++){
126 float adj=center_boost+abs(EHMER_OFFSET-k)*center_decay_rate;
127 if(adj<0. && center_boost>0)adj=0.;
128 if(adj>0. && center_boost<0)adj=0.;
133 /* normalize curves so the driving amplitude is 0dB */
134 /* make temp curves with the ATH overlayed */
135 for(j=0;j<P_LEVELS;j++){
136 attenuate_curve(workc[i][j],curveatt_dB[i]+100.-(j<2?2:j)*10.-P_LEVEL_0);
137 memcpy(athc[j],ath,EHMER_MAX*sizeof(**athc));
138 attenuate_curve(athc[j],+100.-j*10.f-P_LEVEL_0);
139 max_curve(athc[j],workc[i][j]);
142 /* Now limit the louder curves.
144 the idea is this: We don't know what the playback attenuation
145 will be; 0dB SL moves every time the user twiddles the volume
146 knob. So that means we have to use a single 'most pessimal' curve
147 for all masking amplitudes, right? Wrong. The *loudest* sound
148 can be in (we assume) a range of ...+100dB] SL. However, sounds
149 20dB down will be in a range ...+80], 40dB down is from ...+60],
152 for(j=1;j<P_LEVELS;j++){
153 min_curve(athc[j],athc[j-1]);
154 min_curve(workc[i][j],athc[j]);
158 for(i=0;i<P_BANDS;i++){
159 int hi_curve,lo_curve,bin;
160 ret[i]=_ogg_malloc(sizeof(**ret)*P_LEVELS);
162 /* low frequency curves are measured with greater resolution than
163 the MDCT/FFT will actually give us; we want the curve applied
164 to the tone data to be pessimistic and thus apply the minimum
165 masking possible for a given bin. That means that a single bin
166 could span more than one octave and that the curve will be a
167 composite of multiple octaves. It also may mean that a single
168 bin may span > an eighth of an octave and that the eighth
169 octave values may also be composited. */
171 /* which octave curves will we be compositing? */
172 bin=floor(fromOC(i*.5)/binHz);
173 lo_curve= ceil(toOC(bin*binHz+1)*2);
174 hi_curve= floor(toOC((bin+1)*binHz)*2);
175 if(lo_curve>i)lo_curve=i;
176 if(lo_curve<0)lo_curve=0;
177 if(hi_curve>=P_BANDS)hi_curve=P_BANDS-1;
179 for(m=0;m<P_LEVELS;m++){
180 ret[i][m]=_ogg_malloc(sizeof(***ret)*(EHMER_MAX+2));
182 for(j=0;j<n;j++)brute_buffer[j]=999.;
184 /* render the curve into bins, then pull values back into curve.
185 The point is that any inherent subsampling aliasing results in
187 for(k=lo_curve;k<=hi_curve;k++){
190 for(j=0;j<EHMER_MAX;j++){
191 int lo_bin= fromOC(j*.125+k*.5-2.0625)/binHz;
192 int hi_bin= fromOC(j*.125+k*.5-1.9375)/binHz+1;
194 if(lo_bin<0)lo_bin=0;
195 if(lo_bin>n)lo_bin=n;
196 if(lo_bin<l)l=lo_bin;
197 if(hi_bin<0)hi_bin=0;
198 if(hi_bin>n)hi_bin=n;
200 for(;l<hi_bin && l<n;l++)
201 if(brute_buffer[l]>workc[k][m][j])
202 brute_buffer[l]=workc[k][m][j];
206 if(brute_buffer[l]>workc[k][m][EHMER_MAX-1])
207 brute_buffer[l]=workc[k][m][EHMER_MAX-1];
211 /* be equally paranoid about being valid up to next half ocatve */
215 for(j=0;j<EHMER_MAX;j++){
216 int lo_bin= fromOC(j*.125+i*.5-2.0625)/binHz;
217 int hi_bin= fromOC(j*.125+i*.5-1.9375)/binHz+1;
219 if(lo_bin<0)lo_bin=0;
220 if(lo_bin>n)lo_bin=n;
221 if(lo_bin<l)l=lo_bin;
222 if(hi_bin<0)hi_bin=0;
223 if(hi_bin>n)hi_bin=n;
225 for(;l<hi_bin && l<n;l++)
226 if(brute_buffer[l]>workc[k][m][j])
227 brute_buffer[l]=workc[k][m][j];
231 if(brute_buffer[l]>workc[k][m][EHMER_MAX-1])
232 brute_buffer[l]=workc[k][m][EHMER_MAX-1];
237 for(j=0;j<EHMER_MAX;j++){
238 int bin=fromOC(j*.125+i*.5-2.)/binHz;
240 ret[i][m][j+2]=-999.;
243 ret[i][m][j+2]=-999.;
245 ret[i][m][j+2]=brute_buffer[bin];
251 for(j=0;j<EHMER_OFFSET;j++)
252 if(ret[i][m][j+2]>-200.f)break;
255 for(j=EHMER_MAX-1;j>EHMER_OFFSET+1;j--)
256 if(ret[i][m][j+2]>-200.f)
266 void _vp_psy_init(vorbis_look_psy *p,vorbis_info_psy *vi,
267 vorbis_info_psy_global *gi,int n,long rate){
268 long i,j,lo=-99,hi=1;
270 memset(p,0,sizeof(*p));
272 p->eighth_octave_lines=gi->eighth_octave_lines;
273 p->shiftoc=rint(log(gi->eighth_octave_lines*8.f)/log(2.f))-1;
275 p->firstoc=toOC(.25f*rate*.5/n)*(1<<(p->shiftoc+1))-gi->eighth_octave_lines;
276 maxoc=toOC((n+.25f)*rate*.5/n)*(1<<(p->shiftoc+1))+.5f;
277 p->total_octave_lines=maxoc-p->firstoc+1;
278 p->ath=_ogg_malloc(n*sizeof(*p->ath));
280 p->octave=_ogg_malloc(n*sizeof(*p->octave));
281 p->bark=_ogg_malloc(n*sizeof(*p->bark));
286 /* AoTuV HF weighting */
288 if(rate < 26000) p->m_val = 0;
289 else if(rate < 38000) p->m_val = .94; /* 32kHz */
290 else if(rate > 46000) p->m_val = 1.275; /* 48kHz */
292 /* set up the lookups for a given blocksize and sample rate */
294 for(i=0,j=0;i<MAX_ATH-1;i++){
295 int endpos=rint(fromOC((i+1)*.125-2.)*2*n/rate);
298 float delta=(ATH[i+1]-base)/(endpos-j);
299 for(;j<endpos && j<n;j++){
307 p->ath[j]=p->ath[j-1];
311 float bark=toBARK(rate/(2*n)*i);
313 for(;lo+vi->noisewindowlomin<i &&
314 toBARK(rate/(2*n)*lo)<(bark-vi->noisewindowlo);lo++);
316 for(;hi<=n && (hi<i+vi->noisewindowhimin ||
317 toBARK(rate/(2*n)*hi)<(bark+vi->noisewindowhi));hi++);
319 p->bark[i]=((lo-1)<<16)+(hi-1);
324 p->octave[i]=toOC((i+.25f)*.5*rate/n)*(1<<(p->shiftoc+1))+.5f;
326 p->tonecurves=setup_tone_curves(vi->toneatt,rate*.5/n,n,
327 vi->tone_centerboost,vi->tone_decay);
329 /* set up rolling noise median */
330 p->noiseoffset=_ogg_malloc(P_NOISECURVES*sizeof(*p->noiseoffset));
331 for(i=0;i<P_NOISECURVES;i++)
332 p->noiseoffset[i]=_ogg_malloc(n*sizeof(**p->noiseoffset));
335 float halfoc=toOC((i+.5)*rate/(2.*n))*2.;
339 if(halfoc<0)halfoc=0;
340 if(halfoc>=P_BANDS-1)halfoc=P_BANDS-1;
341 inthalfoc=(int)halfoc;
342 del=halfoc-inthalfoc;
344 for(j=0;j<P_NOISECURVES;j++)
345 p->noiseoffset[j][i]=
346 p->vi->noiseoff[j][inthalfoc]*(1.-del) +
347 p->vi->noiseoff[j][inthalfoc+1]*del;
353 _analysis_output_always("noiseoff0",ls,p->noiseoffset[0],n,1,0,0);
354 _analysis_output_always("noiseoff1",ls,p->noiseoffset[1],n,1,0,0);
355 _analysis_output_always("noiseoff2",ls++,p->noiseoffset[2],n,1,0,0);
360 void _vp_psy_clear(vorbis_look_psy *p){
363 if(p->ath)_ogg_free(p->ath);
364 if(p->octave)_ogg_free(p->octave);
365 if(p->bark)_ogg_free(p->bark);
367 for(i=0;i<P_BANDS;i++){
368 for(j=0;j<P_LEVELS;j++){
369 _ogg_free(p->tonecurves[i][j]);
371 _ogg_free(p->tonecurves[i]);
373 _ogg_free(p->tonecurves);
376 for(i=0;i<P_NOISECURVES;i++){
377 _ogg_free(p->noiseoffset[i]);
379 _ogg_free(p->noiseoffset);
381 memset(p,0,sizeof(*p));
385 /* octave/(8*eighth_octave_lines) x scale and dB y scale */
386 static void seed_curve(float *seed,
387 const float **curves,
390 int linesper,float dBoffset){
393 const float *posts,*curve;
395 int choice=(int)((amp+dBoffset-P_LEVEL_0)*.1f);
396 choice=max(choice,0);
397 choice=min(choice,P_LEVELS-1);
398 posts=curves[choice];
401 seedptr=oc+(posts[0]-EHMER_OFFSET)*linesper-(linesper>>1);
403 for(i=posts[0];i<post1;i++){
405 float lin=amp+curve[i];
406 if(seed[seedptr]<lin)seed[seedptr]=lin;
413 static void seed_loop(vorbis_look_psy *p,
414 const float ***curves,
419 vorbis_info_psy *vi=p->vi;
421 float dBoffset=vi->max_curve_dB-specmax;
423 /* prime the working vector with peak values */
427 long oc=p->octave[i];
428 while(i+1<n && p->octave[i+1]==oc){
430 if(f[i]>max)max=f[i];
436 if(oc>=P_BANDS)oc=P_BANDS-1;
442 p->octave[i]-p->firstoc,
443 p->total_octave_lines,
444 p->eighth_octave_lines,
450 static void seed_chase(float *seeds, int linesper, long n){
451 long *posstack=alloca(n*sizeof(*posstack));
452 float *ampstack=alloca(n*sizeof(*ampstack));
460 ampstack[stack++]=seeds[i];
463 if(seeds[i]<ampstack[stack-1]){
465 ampstack[stack++]=seeds[i];
468 if(i<posstack[stack-1]+linesper){
469 if(stack>1 && ampstack[stack-1]<=ampstack[stack-2] &&
470 i<posstack[stack-2]+linesper){
471 /* we completely overlap, making stack-1 irrelevant. pop it */
477 ampstack[stack++]=seeds[i];
485 /* the stack now contains only the positions that are relevant. Scan
486 'em straight through */
488 for(i=0;i<stack;i++){
490 if(i<stack-1 && ampstack[i+1]>ampstack[i]){
491 endpos=posstack[i+1];
493 endpos=posstack[i]+linesper+1; /* +1 is important, else bin 0 is
494 discarded in short frames */
496 if(endpos>n)endpos=n;
497 for(;pos<endpos;pos++)
498 seeds[pos]=ampstack[i];
501 /* there. Linear time. I now remember this was on a problem set I
502 had in Grad Skool... I didn't solve it at the time ;-) */
506 /* bleaugh, this is more complicated than it needs to be */
508 static void max_seeds(vorbis_look_psy *p,
511 long n=p->total_octave_lines;
512 int linesper=p->eighth_octave_lines;
516 seed_chase(seed,linesper,n); /* for masking */
518 pos=p->octave[0]-p->firstoc-(linesper>>1);
520 while(linpos+1<p->n){
521 float minV=seed[pos];
522 long end=((p->octave[linpos]+p->octave[linpos+1])>>1)-p->firstoc;
523 if(minV>p->vi->tone_abs_limit)minV=p->vi->tone_abs_limit;
526 if((seed[pos]>NEGINF && seed[pos]<minV) || minV==NEGINF)
531 for(;linpos<p->n && p->octave[linpos]<=end;linpos++)
532 if(flr[linpos]<minV)flr[linpos]=minV;
536 float minV=seed[p->total_octave_lines-1];
537 for(;linpos<p->n;linpos++)
538 if(flr[linpos]<minV)flr[linpos]=minV;
543 static void bark_noise_hybridmp(int n,const long *b,
549 float *N=alloca(n*sizeof(*N));
550 float *X=alloca(n*sizeof(*N));
551 float *XX=alloca(n*sizeof(*N));
552 float *Y=alloca(n*sizeof(*N));
553 float *XY=alloca(n*sizeof(*N));
555 float tN, tX, tXX, tY, tXY;
565 tN = tX = tXX = tY = tXY = 0.f;
568 if (y < 1.f) y = 1.f;
582 for (i = 1, x = 1.f; i < n; i++, x += 1.f) {
585 if (y < 1.f) y = 1.f;
602 for (i = 0, x = 0.f;; i++, x += 1.f) {
611 tXX = XX[hi] + XX[-lo];
613 tXY = XY[hi] - XY[-lo];
615 A = tY * tXX - tX * tXY;
616 B = tN * tXY - tX * tY;
617 D = tN * tXX - tX * tX;
622 noise[i] = R - offset;
625 for ( ;; i++, x += 1.f) {
633 tXX = XX[hi] - XX[lo];
635 tXY = XY[hi] - XY[lo];
637 A = tY * tXX - tX * tXY;
638 B = tN * tXY - tX * tY;
639 D = tN * tXX - tX * tX;
641 if (R < 0.f) R = 0.f;
643 noise[i] = R - offset;
645 for ( ; i < n; i++, x += 1.f) {
648 if (R < 0.f) R = 0.f;
650 noise[i] = R - offset;
653 if (fixed <= 0) return;
655 for (i = 0, x = 0.f;; i++, x += 1.f) {
662 tXX = XX[hi] + XX[-lo];
664 tXY = XY[hi] - XY[-lo];
667 A = tY * tXX - tX * tXY;
668 B = tN * tXY - tX * tY;
669 D = tN * tXX - tX * tX;
672 if (R - offset < noise[i]) noise[i] = R - offset;
674 for ( ;; i++, x += 1.f) {
682 tXX = XX[hi] - XX[lo];
684 tXY = XY[hi] - XY[lo];
686 A = tY * tXX - tX * tXY;
687 B = tN * tXY - tX * tY;
688 D = tN * tXX - tX * tX;
691 if (R - offset < noise[i]) noise[i] = R - offset;
693 for ( ; i < n; i++, x += 1.f) {
695 if (R - offset < noise[i]) noise[i] = R - offset;
699 void _vp_noisemask(vorbis_look_psy *p,
704 float *work=alloca(n*sizeof(*work));
706 bark_noise_hybridmp(n,p->bark,logmdct,logmask,
709 for(i=0;i<n;i++)work[i]=logmdct[i]-logmask[i];
711 bark_noise_hybridmp(n,p->bark,work,logmask,0.,
712 p->vi->noisewindowfixed);
714 for(i=0;i<n;i++)work[i]=logmdct[i]-work[i];
722 work2[i]=logmask[i]+work[i];
726 _analysis_output("median2R",seq/2,work,n,1,0,0);
728 _analysis_output("median2L",seq/2,work,n,1,0,0);
731 _analysis_output("envelope2R",seq/2,work2,n,1,0,0);
733 _analysis_output("envelope2L",seq/2,work2,n,1,0,0);
739 int dB=logmask[i]+.5;
740 if(dB>=NOISE_COMPAND_LEVELS)dB=NOISE_COMPAND_LEVELS-1;
742 logmask[i]= work[i]+p->vi->noisecompand[dB];
747 void _vp_tonemask(vorbis_look_psy *p,
750 float global_specmax,
751 float local_specmax){
755 float *seed=alloca(sizeof(*seed)*p->total_octave_lines);
756 float att=local_specmax+p->vi->ath_adjatt;
757 for(i=0;i<p->total_octave_lines;i++)seed[i]=NEGINF;
759 /* set the ATH (floating below localmax, not global max by a
761 if(att<p->vi->ath_maxatt)att=p->vi->ath_maxatt;
764 logmask[i]=p->ath[i]+att;
767 seed_loop(p,(const float ***)p->tonecurves,logfft,logmask,seed,global_specmax);
768 max_seeds(p,seed,logmask);
772 void _vp_offset_and_mix(vorbis_look_psy *p,
780 float de, coeffi, cx;/* AoTuV */
781 float toneatt=p->vi->tone_masteratt[offset_select];
786 float val= noise[i]+p->noiseoffset[offset_select][i];
787 if(val>p->vi->noisemaxsupp)val=p->vi->noisemaxsupp;
788 logmask[i]=max(val,tone[i]+toneatt);
793 The following codes improve a noise problem.
794 A fundamental idea uses the value of masking and carries out
795 the relative compensation of the MDCT.
796 However, this code is not perfect and all noise problems cannot be solved.
797 by Aoyumi @ 2004/04/18
800 if(offset_select == 1) {
801 coeffi = -17.2; /* coeffi is a -17.2dB threshold */
802 val = val - logmdct[i]; /* val == mdct line value relative to floor in dB */
805 /* mdct value is > -17.2 dB below floor */
807 de = 1.0-((val-coeffi)*0.005*cx);
808 /* pro-rated attenuation:
809 -0.00 dB boost if mdct value is -17.2dB (relative to floor)
810 -0.77 dB boost if mdct value is 0dB (relative to floor)
811 -1.64 dB boost if mdct value is +17.2dB (relative to floor)
814 if(de < 0) de = 0.0001;
816 /* mdct value is <= -17.2 dB below floor */
818 de = 1.0-((val-coeffi)*0.0003*cx);
819 /* pro-rated attenuation:
820 +0.00 dB atten if mdct value is -17.2dB (relative to floor)
821 +0.45 dB atten if mdct value is -34.4dB (relative to floor)
830 float _vp_ampmax_decay(float amp,vorbis_dsp_state *vd){
831 vorbis_info *vi=vd->vi;
832 codec_setup_info *ci=vi->codec_setup;
833 vorbis_info_psy_global *gi=&ci->psy_g_param;
835 int n=ci->blocksizes[vd->W]/2;
836 float secs=(float)n/vi->rate;
838 amp+=secs*gi->ampmax_att_per_sec;
839 if(amp<-9999)amp=-9999;
843 static float FLOOR1_fromdB_LOOKUP[256]={
844 1.0649863e-07F, 1.1341951e-07F, 1.2079015e-07F, 1.2863978e-07F,
845 1.3699951e-07F, 1.4590251e-07F, 1.5538408e-07F, 1.6548181e-07F,
846 1.7623575e-07F, 1.8768855e-07F, 1.9988561e-07F, 2.128753e-07F,
847 2.2670913e-07F, 2.4144197e-07F, 2.5713223e-07F, 2.7384213e-07F,
848 2.9163793e-07F, 3.1059021e-07F, 3.3077411e-07F, 3.5226968e-07F,
849 3.7516214e-07F, 3.9954229e-07F, 4.2550680e-07F, 4.5315863e-07F,
850 4.8260743e-07F, 5.1396998e-07F, 5.4737065e-07F, 5.8294187e-07F,
851 6.2082472e-07F, 6.6116941e-07F, 7.0413592e-07F, 7.4989464e-07F,
852 7.9862701e-07F, 8.5052630e-07F, 9.0579828e-07F, 9.6466216e-07F,
853 1.0273513e-06F, 1.0941144e-06F, 1.1652161e-06F, 1.2409384e-06F,
854 1.3215816e-06F, 1.4074654e-06F, 1.4989305e-06F, 1.5963394e-06F,
855 1.7000785e-06F, 1.8105592e-06F, 1.9282195e-06F, 2.0535261e-06F,
856 2.1869758e-06F, 2.3290978e-06F, 2.4804557e-06F, 2.6416497e-06F,
857 2.8133190e-06F, 2.9961443e-06F, 3.1908506e-06F, 3.3982101e-06F,
858 3.6190449e-06F, 3.8542308e-06F, 4.1047004e-06F, 4.3714470e-06F,
859 4.6555282e-06F, 4.9580707e-06F, 5.2802740e-06F, 5.6234160e-06F,
860 5.9888572e-06F, 6.3780469e-06F, 6.7925283e-06F, 7.2339451e-06F,
861 7.7040476e-06F, 8.2047000e-06F, 8.7378876e-06F, 9.3057248e-06F,
862 9.9104632e-06F, 1.0554501e-05F, 1.1240392e-05F, 1.1970856e-05F,
863 1.2748789e-05F, 1.3577278e-05F, 1.4459606e-05F, 1.5399272e-05F,
864 1.6400004e-05F, 1.7465768e-05F, 1.8600792e-05F, 1.9809576e-05F,
865 2.1096914e-05F, 2.2467911e-05F, 2.3928002e-05F, 2.5482978e-05F,
866 2.7139006e-05F, 2.8902651e-05F, 3.0780908e-05F, 3.2781225e-05F,
867 3.4911534e-05F, 3.7180282e-05F, 3.9596466e-05F, 4.2169667e-05F,
868 4.4910090e-05F, 4.7828601e-05F, 5.0936773e-05F, 5.4246931e-05F,
869 5.7772202e-05F, 6.1526565e-05F, 6.5524908e-05F, 6.9783085e-05F,
870 7.4317983e-05F, 7.9147585e-05F, 8.4291040e-05F, 8.9768747e-05F,
871 9.5602426e-05F, 0.00010181521F, 0.00010843174F, 0.00011547824F,
872 0.00012298267F, 0.00013097477F, 0.00013948625F, 0.00014855085F,
873 0.00015820453F, 0.00016848555F, 0.00017943469F, 0.00019109536F,
874 0.00020351382F, 0.00021673929F, 0.00023082423F, 0.00024582449F,
875 0.00026179955F, 0.00027881276F, 0.00029693158F, 0.00031622787F,
876 0.00033677814F, 0.00035866388F, 0.00038197188F, 0.00040679456F,
877 0.00043323036F, 0.00046138411F, 0.00049136745F, 0.00052329927F,
878 0.00055730621F, 0.00059352311F, 0.00063209358F, 0.00067317058F,
879 0.00071691700F, 0.00076350630F, 0.00081312324F, 0.00086596457F,
880 0.00092223983F, 0.00098217216F, 0.0010459992F, 0.0011139742F,
881 0.0011863665F, 0.0012634633F, 0.0013455702F, 0.0014330129F,
882 0.0015261382F, 0.0016253153F, 0.0017309374F, 0.0018434235F,
883 0.0019632195F, 0.0020908006F, 0.0022266726F, 0.0023713743F,
884 0.0025254795F, 0.0026895994F, 0.0028643847F, 0.0030505286F,
885 0.0032487691F, 0.0034598925F, 0.0036847358F, 0.0039241906F,
886 0.0041792066F, 0.0044507950F, 0.0047400328F, 0.0050480668F,
887 0.0053761186F, 0.0057254891F, 0.0060975636F, 0.0064938176F,
888 0.0069158225F, 0.0073652516F, 0.0078438871F, 0.0083536271F,
889 0.0088964928F, 0.009474637F, 0.010090352F, 0.010746080F,
890 0.011444421F, 0.012188144F, 0.012980198F, 0.013823725F,
891 0.014722068F, 0.015678791F, 0.016697687F, 0.017782797F,
892 0.018938423F, 0.020169149F, 0.021479854F, 0.022875735F,
893 0.024362330F, 0.025945531F, 0.027631618F, 0.029427276F,
894 0.031339626F, 0.033376252F, 0.035545228F, 0.037855157F,
895 0.040315199F, 0.042935108F, 0.045725273F, 0.048696758F,
896 0.051861348F, 0.055231591F, 0.058820850F, 0.062643361F,
897 0.066714279F, 0.071049749F, 0.075666962F, 0.080584227F,
898 0.085821044F, 0.091398179F, 0.097337747F, 0.10366330F,
899 0.11039993F, 0.11757434F, 0.12521498F, 0.13335215F,
900 0.14201813F, 0.15124727F, 0.16107617F, 0.17154380F,
901 0.18269168F, 0.19456402F, 0.20720788F, 0.22067342F,
902 0.23501402F, 0.25028656F, 0.26655159F, 0.28387361F,
903 0.30232132F, 0.32196786F, 0.34289114F, 0.36517414F,
904 0.38890521F, 0.41417847F, 0.44109412F, 0.46975890F,
905 0.50028648F, 0.53279791F, 0.56742212F, 0.60429640F,
906 0.64356699F, 0.68538959F, 0.72993007F, 0.77736504F,
907 0.82788260F, 0.88168307F, 0.9389798F, 1.F,
910 /* this is for per-channel noise normalization */
911 static int apsort(const void *a, const void *b){
912 float f1=**(float**)a;
913 float f2=**(float**)b;
914 return (f1<f2)-(f1>f2);
917 static void flag_lossless(int limit, float prepoint, float postpoint, float *mdct,
918 float *floor, int *flag, int i, int jn){
921 float point = j>=limit-i ? postpoint : prepoint;
922 float r = fabs(mdct[j])/floor[j];
930 /* Overload/Side effect: On input, the *q vector holds either the
931 quantized energy (for elements with the flag set) or the absolute
932 values of the *r vector (for elements with flag unset). On output,
933 *q holds the quantized energy for all elements */
934 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){
936 vorbis_info_psy *vi=p->vi;
937 float **sort = alloca(n*sizeof(*sort));
939 int start = (vi->normal_p ? vi->normal_start-i : n);
942 /* force classic behavior where only energy in the current band is considered */
945 /* still responsible for populating *out where noise norm not in
946 effect. There's no need to [re]populate *q in these areas */
947 for(j=0;j<start;j++){
948 if(!flags || !flags[j]){ /* lossless coupling already quantized.
949 Don't touch; requantizing based on
950 energy would be incorrect. */
951 float ve = q[j]/f[j];
953 out[j] = -rint(sqrt(ve));
955 out[j] = rint(sqrt(ve));
959 /* sort magnitudes for noise norm portion of partition */
961 if(!flags || !flags[j]){ /* can't noise norm elements that have
962 already been loslessly coupled; we can
963 only account for their energy error */
964 float ve = q[j]/f[j];
965 /* Despite all the new, more capable coupling code, for now we
966 implement noise norm as it has been up to this point. Only
967 consider promotions to unit magnitude from 0. In addition
968 the only energy error counted is quantizations to zero. */
969 /* also-- the original point code only applied noise norm at > pointlimit */
970 if(ve<.25f && (!flags || j>=limit-i)){
972 sort[count++]=q+j; /* q is fabs(r) for unflagged element */
974 /* For now: no acc adjustment for nonzero quantization. populate *out and q as this value is final. */
976 out[j] = -rint(sqrt(ve));
978 out[j] = rint(sqrt(ve));
979 q[j] = out[j]*out[j]*f[j];
982 again, no energy adjustment for error in nonzero quant-- for now
987 /* noise norm to do */
988 qsort(sort,count,sizeof(*sort),apsort);
989 for(j=0;j<count;j++){
991 if(acc>=vi->normal_thresh){
992 out[k]=unitnorm(r[k]);
1005 /* Noise normalization, quantization and coupling are not wholly
1006 seperable processes in depth>1 coupling. */
1007 void _vp_couple_quantize_normalize(int blobno,
1008 vorbis_info_psy_global *g,
1010 vorbis_info_mapping0 *vi,
1014 int sliding_lowpass,
1019 int partition=(p->vi->normal_p ? p->vi->normal_partition : 16);
1020 int limit = g->coupling_pointlimit[p->vi->blockflag][blobno];
1021 float prepoint=stereo_threshholds[g->coupling_prepointamp[blobno]];
1022 float postpoint=stereo_threshholds[g->coupling_postpointamp[blobno]];
1024 float de=0.1*p->m_val; /* a blend of the AoTuV M2 and M3 code here and below */
1027 /* mdct is our raw mdct output, floor not removed. */
1028 /* inout passes in the ifloor, passes back quantized result */
1030 /* unquantized energy (negative indicates amplitude has negative sign) */
1031 float **raw = alloca(ch*sizeof(*raw));
1033 /* dual pupose; quantized energy (if flag set), othersize fabs(raw) */
1034 float **quant = alloca(ch*sizeof(*quant));
1037 float **floor = alloca(ch*sizeof(*floor));
1039 /* flags indicating raw/quantized status of elements in raw vector */
1040 int **flag = alloca(ch*sizeof(*flag));
1042 /* non-zero flag working vector */
1043 int *nz = alloca(ch*sizeof(*nz));
1045 /* energy surplus/defecit tracking */
1046 float *acc = alloca((ch+vi->coupling_steps)*sizeof(*acc));
1048 /* The threshold of a stereo is changed with the size of n */
1050 postpoint=stereo_threshholds_limited[g->coupling_postpointamp[blobno]];
1052 raw[0] = alloca(ch*partition*sizeof(**raw));
1053 quant[0] = alloca(ch*partition*sizeof(**quant));
1054 floor[0] = alloca(ch*partition*sizeof(**floor));
1055 flag[0] = alloca(ch*partition*sizeof(**flag));
1058 raw[i] = &raw[0][partition*i];
1059 quant[i] = &quant[0][partition*i];
1060 floor[i] = &floor[0][partition*i];
1061 flag[i] = &flag[0][partition*i];
1063 for(i=0;i<ch+vi->coupling_steps;i++)
1066 for(i=0;i<n;i+=partition){
1067 int k,j,jn = partition > n-i ? n-i : partition;
1070 memcpy(nz,nonzero,sizeof(*nz)*ch);
1073 memset(flag[0],0,ch*partition*sizeof(**flag));
1075 int *iout = &iwork[k][i];
1079 floor[k][j] = FLOOR1_fromdB_LOOKUP[iout[j]];
1081 flag_lossless(limit,prepoint,postpoint,&mdct[k][i],floor[k],flag[k],i,jn);
1084 quant[k][j] = raw[k][j] = mdct[k][i+j]*mdct[k][i+j];
1085 if(mdct[k][i+j]<0.f) raw[k][j]*=-1.f;
1086 floor[k][j]*=floor[k][j];
1089 acc[track]=noise_normalize(p,limit,raw[k],quant[k],floor[k],NULL,acc[track],i,jn,iout);
1093 floor[k][j] = 1e-10f;
1105 for(step=0;step<vi->coupling_steps;step++){
1106 int Mi = vi->coupling_mag[step];
1107 int Ai = vi->coupling_ang[step];
1108 int *iM = &iwork[Mi][i];
1109 int *iA = &iwork[Ai][i];
1110 float *reM = raw[Mi];
1111 float *reA = raw[Ai];
1112 float *qeM = quant[Mi];
1113 float *qeA = quant[Ai];
1114 float *floorM = floor[Mi];
1115 float *floorA = floor[Ai];
1119 if(nz[Mi] || nz[Ai]){
1120 nz[Mi] = nz[Ai] = 1;
1124 if(j<sliding_lowpass-i){
1126 /* lossless coupling */
1128 reM[j] = fabs(reM[j])+fabs(reA[j]);
1129 qeM[j] = qeM[j]+qeA[j];
1138 iA[j]=(A>0?A-B:B-A);
1140 iA[j]=(B>0?A-B:B-A);
1144 /* collapse two equivalent tuples to one */
1145 if(iA[j]>=abs(iM[j])*2){
1153 /* lossy (point) coupling */
1157 qeM[j] = fabs(reM[j]);
1162 The boost problem by the combination of noise normalization and point stereo is eased.
1163 However, this is a temporary patch.
1164 by Aoyumi @ 2004/04/18
1166 float derate = (1.0 - de*((float)(j-limit+i) / (float)(n-limit)));
1168 if(reM[j]+reA[j]<0){
1169 reM[j] = - (qeM[j] = (fabs(reM[j])+fabs(reA[j]))*derate*derate);
1171 reM[j] = (qeM[j] = (fabs(reM[j])+fabs(reA[j]))*derate*derate);
1175 if(reM[j]+reA[j]<0){
1176 reM[j] = - (qeM[j] = fabs(reM[j])+fabs(reA[j]));
1178 reM[j] = (qeM[j] = fabs(reM[j])+fabs(reA[j]));
1188 floorM[j]=floorA[j]=floorM[j]+floorA[j];
1190 /* normalize the resulting mag vector */
1191 acc[track]=noise_normalize(p,limit,raw[Mi],quant[Mi],floor[Mi],flag[Mi],acc[track],i,jn,iM);
1197 for(i=0;i<vi->coupling_steps;i++){
1198 /* make sure coupling a zero and a nonzero channel results in two
1199 nonzero channels. */
1200 if(nonzero[vi->coupling_mag[i]] ||
1201 nonzero[vi->coupling_ang[i]]){
1202 nonzero[vi->coupling_mag[i]]=1;
1203 nonzero[vi->coupling_ang[i]]=1;