summaryrefslogtreecommitdiffhomepage
path: root/contrib/vorbis/lib/envelope.c
diff options
context:
space:
mode:
Diffstat (limited to 'contrib/vorbis/lib/envelope.c')
-rw-r--r--contrib/vorbis/lib/envelope.c374
1 files changed, 0 insertions, 374 deletions
diff --git a/contrib/vorbis/lib/envelope.c b/contrib/vorbis/lib/envelope.c
deleted file mode 100644
index da75237..0000000
--- a/contrib/vorbis/lib/envelope.c
+++ /dev/null
@@ -1,374 +0,0 @@
-/********************************************************************
- * *
- * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
- * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
- * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
- * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
- * *
- * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
- * by the Xiph.Org Foundation http://www.xiph.org/ *
- * *
- ********************************************************************
-
- function: PCM data envelope analysis
-
- ********************************************************************/
-
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <math.h>
-#include <ogg/ogg.h>
-#include "vorbis/codec.h"
-#include "codec_internal.h"
-
-#include "os.h"
-#include "scales.h"
-#include "envelope.h"
-#include "mdct.h"
-#include "misc.h"
-
-void _ve_envelope_init(envelope_lookup *e,vorbis_info *vi){
- codec_setup_info *ci=vi->codec_setup;
- vorbis_info_psy_global *gi=&ci->psy_g_param;
- int ch=vi->channels;
- int i,j;
- int n=e->winlength=128;
- e->searchstep=64; /* not random */
-
- e->minenergy=gi->preecho_minenergy;
- e->ch=ch;
- e->storage=128;
- e->cursor=ci->blocksizes[1]/2;
- e->mdct_win=_ogg_calloc(n,sizeof(*e->mdct_win));
- mdct_init(&e->mdct,n);
-
- for(i=0;i<n;i++){
- e->mdct_win[i]=sin(i/(n-1.)*M_PI);
- e->mdct_win[i]*=e->mdct_win[i];
- }
-
- /* magic follows */
- e->band[0].begin=2; e->band[0].end=4;
- e->band[1].begin=4; e->band[1].end=5;
- e->band[2].begin=6; e->band[2].end=6;
- e->band[3].begin=9; e->band[3].end=8;
- e->band[4].begin=13; e->band[4].end=8;
- e->band[5].begin=17; e->band[5].end=8;
- e->band[6].begin=22; e->band[6].end=8;
-
- for(j=0;j<VE_BANDS;j++){
- n=e->band[j].end;
- e->band[j].window=_ogg_malloc(n*sizeof(*e->band[0].window));
- for(i=0;i<n;i++){
- e->band[j].window[i]=sin((i+.5)/n*M_PI);
- e->band[j].total+=e->band[j].window[i];
- }
- e->band[j].total=1./e->band[j].total;
- }
-
- e->filter=_ogg_calloc(VE_BANDS*ch,sizeof(*e->filter));
- e->mark=_ogg_calloc(e->storage,sizeof(*e->mark));
-
-}
-
-void _ve_envelope_clear(envelope_lookup *e){
- int i;
- mdct_clear(&e->mdct);
- for(i=0;i<VE_BANDS;i++)
- _ogg_free(e->band[i].window);
- _ogg_free(e->mdct_win);
- _ogg_free(e->filter);
- _ogg_free(e->mark);
- memset(e,0,sizeof(*e));
-}
-
-/* fairly straight threshhold-by-band based until we find something
- that works better and isn't patented. */
-
-static int _ve_amp(envelope_lookup *ve,
- vorbis_info_psy_global *gi,
- float *data,
- envelope_band *bands,
- envelope_filter_state *filters){
- long n=ve->winlength;
- int ret=0;
- long i,j;
- float decay;
-
- /* we want to have a 'minimum bar' for energy, else we're just
- basing blocks on quantization noise that outweighs the signal
- itself (for low power signals) */
-
- float minV=ve->minenergy;
- float *vec=alloca(n*sizeof(*vec));
-
- /* stretch is used to gradually lengthen the number of windows
- considered prevoius-to-potential-trigger */
- int stretch=max(VE_MINSTRETCH,ve->stretch/2);
- float penalty=gi->stretch_penalty-(ve->stretch/2-VE_MINSTRETCH);
- if(penalty<0.f)penalty=0.f;
- if(penalty>gi->stretch_penalty)penalty=gi->stretch_penalty;
-
- /*_analysis_output_always("lpcm",seq2,data,n,0,0,
- totalshift+pos*ve->searchstep);*/
-
- /* window and transform */
- for(i=0;i<n;i++)
- vec[i]=data[i]*ve->mdct_win[i];
- mdct_forward(&ve->mdct,vec,vec);
-
- /*_analysis_output_always("mdct",seq2,vec,n/2,0,1,0); */
-
- /* near-DC spreading function; this has nothing to do with
- psychoacoustics, just sidelobe leakage and window size */
- {
- float temp=vec[0]*vec[0]+.7*vec[1]*vec[1]+.2*vec[2]*vec[2];
- int ptr=filters->nearptr;
-
- /* the accumulation is regularly refreshed from scratch to avoid
- floating point creep */
- if(ptr==0){
- decay=filters->nearDC_acc=filters->nearDC_partialacc+temp;
- filters->nearDC_partialacc=temp;
- }else{
- decay=filters->nearDC_acc+=temp;
- filters->nearDC_partialacc+=temp;
- }
- filters->nearDC_acc-=filters->nearDC[ptr];
- filters->nearDC[ptr]=temp;
-
- decay*=(1./(VE_NEARDC+1));
- filters->nearptr++;
- if(filters->nearptr>=VE_NEARDC)filters->nearptr=0;
- decay=todB(&decay)*.5-15.f;
- }
-
- /* perform spreading and limiting, also smooth the spectrum. yes,
- the MDCT results in all real coefficients, but it still *behaves*
- like real/imaginary pairs */
- for(i=0;i<n/2;i+=2){
- float val=vec[i]*vec[i]+vec[i+1]*vec[i+1];
- val=todB(&val)*.5f;
- if(val<decay)val=decay;
- if(val<minV)val=minV;
- vec[i>>1]=val;
- decay-=8.;
- }
-
- /*_analysis_output_always("spread",seq2++,vec,n/4,0,0,0);*/
-
- /* perform preecho/postecho triggering by band */
- for(j=0;j<VE_BANDS;j++){
- float acc=0.;
- float valmax,valmin;
-
- /* accumulate amplitude */
- for(i=0;i<bands[j].end;i++)
- acc+=vec[i+bands[j].begin]*bands[j].window[i];
-
- acc*=bands[j].total;
-
- /* convert amplitude to delta */
- {
- int p,this=filters[j].ampptr;
- float postmax,postmin,premax=-99999.f,premin=99999.f;
-
- p=this;
- p--;
- if(p<0)p+=VE_AMP;
- postmax=max(acc,filters[j].ampbuf[p]);
- postmin=min(acc,filters[j].ampbuf[p]);
-
- for(i=0;i<stretch;i++){
- p--;
- if(p<0)p+=VE_AMP;
- premax=max(premax,filters[j].ampbuf[p]);
- premin=min(premin,filters[j].ampbuf[p]);
- }
-
- valmin=postmin-premin;
- valmax=postmax-premax;
-
- /*filters[j].markers[pos]=valmax;*/
- filters[j].ampbuf[this]=acc;
- filters[j].ampptr++;
- if(filters[j].ampptr>=VE_AMP)filters[j].ampptr=0;
- }
-
- /* look at min/max, decide trigger */
- if(valmax>gi->preecho_thresh[j]+penalty){
- ret|=1;
- ret|=4;
- }
- if(valmin<gi->postecho_thresh[j]-penalty)ret|=2;
- }
-
- return(ret);
-}
-
-#if 0
-static int seq=0;
-static ogg_int64_t totalshift=-1024;
-#endif
-
-long _ve_envelope_search(vorbis_dsp_state *v){
- vorbis_info *vi=v->vi;
- codec_setup_info *ci=vi->codec_setup;
- vorbis_info_psy_global *gi=&ci->psy_g_param;
- envelope_lookup *ve=((private_state *)(v->backend_state))->ve;
- long i,j;
-
- int first=ve->current/ve->searchstep;
- int last=v->pcm_current/ve->searchstep-VE_WIN;
- if(first<0)first=0;
-
- /* make sure we have enough storage to match the PCM */
- if(last+VE_WIN+VE_POST>ve->storage){
- ve->storage=last+VE_WIN+VE_POST; /* be sure */
- ve->mark=_ogg_realloc(ve->mark,ve->storage*sizeof(*ve->mark));
- }
-
- for(j=first;j<last;j++){
- int ret=0;
-
- ve->stretch++;
- if(ve->stretch>VE_MAXSTRETCH*2)
- ve->stretch=VE_MAXSTRETCH*2;
-
- for(i=0;i<ve->ch;i++){
- float *pcm=v->pcm[i]+ve->searchstep*(j);
- ret|=_ve_amp(ve,gi,pcm,ve->band,ve->filter+i*VE_BANDS);
- }
-
- ve->mark[j+VE_POST]=0;
- if(ret&1){
- ve->mark[j]=1;
- ve->mark[j+1]=1;
- }
-
- if(ret&2){
- ve->mark[j]=1;
- if(j>0)ve->mark[j-1]=1;
- }
-
- if(ret&4)ve->stretch=-1;
- }
-
- ve->current=last*ve->searchstep;
-
- {
- long centerW=v->centerW;
- long testW=
- centerW+
- ci->blocksizes[v->W]/4+
- ci->blocksizes[1]/2+
- ci->blocksizes[0]/4;
-
- j=ve->cursor;
-
- while(j<ve->current-(ve->searchstep)){/* account for postecho
- working back one window */
- if(j>=testW)return(1);
-
- ve->cursor=j;
-
- if(ve->mark[j/ve->searchstep]){
- if(j>centerW){
-
-#if 0
- if(j>ve->curmark){
- float *marker=alloca(v->pcm_current*sizeof(*marker));
- int l,m;
- memset(marker,0,sizeof(*marker)*v->pcm_current);
- fprintf(stderr,"mark! seq=%d, cursor:%fs time:%fs\n",
- seq,
- (totalshift+ve->cursor)/44100.,
- (totalshift+j)/44100.);
- _analysis_output_always("pcmL",seq,v->pcm[0],v->pcm_current,0,0,totalshift);
- _analysis_output_always("pcmR",seq,v->pcm[1],v->pcm_current,0,0,totalshift);
-
- _analysis_output_always("markL",seq,v->pcm[0],j,0,0,totalshift);
- _analysis_output_always("markR",seq,v->pcm[1],j,0,0,totalshift);
-
- for(m=0;m<VE_BANDS;m++){
- char buf[80];
- sprintf(buf,"delL%d",m);
- for(l=0;l<last;l++)marker[l*ve->searchstep]=ve->filter[m].markers[l]*.1;
- _analysis_output_always(buf,seq,marker,v->pcm_current,0,0,totalshift);
- }
-
- for(m=0;m<VE_BANDS;m++){
- char buf[80];
- sprintf(buf,"delR%d",m);
- for(l=0;l<last;l++)marker[l*ve->searchstep]=ve->filter[m+VE_BANDS].markers[l]*.1;
- _analysis_output_always(buf,seq,marker,v->pcm_current,0,0,totalshift);
- }
-
- for(l=0;l<last;l++)marker[l*ve->searchstep]=ve->mark[l]*.4;
- _analysis_output_always("mark",seq,marker,v->pcm_current,0,0,totalshift);
-
-
- seq++;
-
- }
-#endif
-
- ve->curmark=j;
- if(j>=testW)return(1);
- return(0);
- }
- }
- j+=ve->searchstep;
- }
- }
-
- return(-1);
-}
-
-int _ve_envelope_mark(vorbis_dsp_state *v){
- envelope_lookup *ve=((private_state *)(v->backend_state))->ve;
- vorbis_info *vi=v->vi;
- codec_setup_info *ci=vi->codec_setup;
- long centerW=v->centerW;
- long beginW=centerW-ci->blocksizes[v->W]/4;
- long endW=centerW+ci->blocksizes[v->W]/4;
- if(v->W){
- beginW-=ci->blocksizes[v->lW]/4;
- endW+=ci->blocksizes[v->nW]/4;
- }else{
- beginW-=ci->blocksizes[0]/4;
- endW+=ci->blocksizes[0]/4;
- }
-
- if(ve->curmark>=beginW && ve->curmark<endW)return(1);
- {
- long first=beginW/ve->searchstep;
- long last=endW/ve->searchstep;
- long i;
- for(i=first;i<last;i++)
- if(ve->mark[i])return(1);
- }
- return(0);
-}
-
-void _ve_envelope_shift(envelope_lookup *e,long shift){
- int smallsize=e->current/e->searchstep+VE_POST; /* adjust for placing marks
- ahead of ve->current */
- int smallshift=shift/e->searchstep;
-
- memmove(e->mark,e->mark+smallshift,(smallsize-smallshift)*sizeof(*e->mark));
-
-#if 0
- for(i=0;i<VE_BANDS*e->ch;i++)
- memmove(e->filter[i].markers,
- e->filter[i].markers+smallshift,
- (1024-smallshift)*sizeof(*(*e->filter).markers));
- totalshift+=shift;
-#endif
-
- e->current-=shift;
- if(e->curmark>=0)
- e->curmark-=shift;
- e->cursor-=shift;
-}
generated by cgit v1.1 at 2024-05-18 22:58:25 +0000