Chris@1: /********************************************************************
Chris@1:  *                                                                  *
Chris@1:  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
Chris@1:  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
Chris@1:  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
Chris@1:  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
Chris@1:  *                                                                  *
Chris@1:  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
Chris@1:  * by the Xiph.Org Foundation http://www.xiph.org/                  *
Chris@1:  *                                                                  *
Chris@1:  ********************************************************************
Chris@1: 
Chris@1:  function: simple utility that runs audio through the psychoacoustics
Chris@1:            without encoding
Chris@1:  last mod: $Id: psytune.c 16037 2009-05-26 21:10:58Z xiphmont $
Chris@1: 
Chris@1:  ********************************************************************/
Chris@1: 
Chris@1: /* NB: this is dead code, retained purely for doc and reference value
Chris@1:        don't try to compile it */
Chris@1: 
Chris@1: #include <stdio.h>
Chris@1: #include <stdlib.h>
Chris@1: #include <string.h>
Chris@1: #include <math.h>
Chris@1: 
Chris@1: #include "vorbis/codec.h"
Chris@1: #include "codec_internal.h"
Chris@1: #include "os.h"
Chris@1: #include "misc.h"
Chris@1: #include "psy.h"
Chris@1: #include "mdct.h"
Chris@1: #include "smallft.h"
Chris@1: #include "window.h"
Chris@1: #include "scales.h"
Chris@1: #include "lpc.h"
Chris@1: #include "lsp.h"
Chris@1: #include "masking.h"
Chris@1: #include "registry.h"
Chris@1: 
Chris@1: static vorbis_info_psy_global _psy_set0G={
Chris@1:   0,   /* decaydBpms */
Chris@1:   8,   /* lines per eighth octave */
Chris@1:   
Chris@1:   /* thresh sample period, preecho clamp trigger threshhold, range, minenergy */
Chris@1:   256, {26.f,26.f,26.f,30.f}, {-90.f,-90.f,-90.f,-90.f}, -90.f,
Chris@1:   -6.f, 
Chris@1:   
Chris@1:   0,
Chris@1: 
Chris@1:   0.,
Chris@1:   0.,
Chris@1: };
Chris@1: 
Chris@1: static vp_part _vp_part0[]={
Chris@1:   {    1,9e10f, 9e10f,       1.f,9999.f},
Chris@1:   { 9999,  .75f, 9e10f,       .5f,9999.f},
Chris@1: /*{ 9999, 1.5f, 9e10f,       .5f,9999.f},*/
Chris@1:   {   18,9e10f, 9e10f,       .5f,  30.f},
Chris@1:   { 9999,9e10f, 9e10f,       .5f,  30.f}
Chris@1: };
Chris@1: 
Chris@1: static vp_couple _vp_couple0[]={
Chris@1:   {    1,  {9e10f,9e10f,0}, {   0.f,   0.f,0}, {   0.f, 0.f,0}, {0.f,0.f,0}},
Chris@1:   {   18,  {9e10f,9e10f,0}, {   0.f,   0.f,0}, {   0.f, 0.f,0}, {0.f,0.f,0}},
Chris@1:   { 9999,  {9e10f,9e10f,0}, {   0.f, 9e10f,0}, {   0.f,22.f,1}, {0.f,0.f,0}}
Chris@1: };
Chris@1: 
Chris@1: static vorbis_info_psy _psy_set0={
Chris@1:   ATH_Bark_dB_lineaggressive,
Chris@1:   
Chris@1:   -100.f,
Chris@1:   -140.f,
Chris@1:   6.f, /* floor master att */
Chris@1: 
Chris@1:   /*     0  1  2   3   4   5   6   7   8   9  10  11  12  13  14  15   16   */
Chris@1:   /* x: 63 88 125 175 250 350 500 700 1k 1.4k 2k 2.8k 4k 5.6k 8k 11.5k 16k Hz */
Chris@1:   /* y: 0 10 20 30 40 50 60 70 80 90 100 dB */
Chris@1:    1,  /* tonemaskp */
Chris@1:   0.f, /* tone master att */
Chris@1:   /*  0   10   20   30   40   50   60   70   80   90   100 */
Chris@1:   {
Chris@1:    {-999.f,-999.f,-999.f,-999.f,-999.f,-999.f,-999.f,-999.f,-999.f,-999.f,-999.f}, /*63*/
Chris@1:    {-999.f,-999.f,-999.f,-999.f,-999.f,-999.f,-999.f,-999.f,-999.f,-999.f,-999.f}, /*88*/
Chris@1:    {-999.f,-999.f,-999.f,-999.f,-999.f,-999.f,-999.f,-999.f,-999.f,-999.f,-999.f}, /*125*/
Chris@1: 
Chris@1:    {-30.f,-30.f,-35.f,-40.f,-40.f,-50.f,-60.f,-70.f,-80.f,-90.f,-100.f}, /*175*/
Chris@1:    {-30.f,-30.f,-35.f,-40.f,-40.f,-50.f,-60.f,-70.f,-80.f,-90.f,-100.f}, /*250*/
Chris@1:    {-30.f,-30.f,-35.f,-40.f,-40.f,-50.f,-60.f,-70.f,-80.f,-90.f,-100.f}, /*350*/
Chris@1:    {-30.f,-30.f,-35.f,-40.f,-40.f,-50.f,-60.f,-70.f,-80.f,-90.f,-100.f}, /*500*/
Chris@1:    {-30.f,-30.f,-35.f,-40.f,-40.f,-50.f,-60.f,-70.f,-80.f,-90.f,-100.f}, /*700*/
Chris@1:    {-30.f,-30.f,-35.f,-40.f,-40.f,-50.f,-60.f,-70.f,-80.f,-90.f,-100.f}, /*1000*/
Chris@1:    {-30.f,-30.f,-35.f,-40.f,-40.f,-50.f,-60.f,-70.f,-80.f,-90.f,-100.f}, /*1400*/
Chris@1:    {-40.f,-40.f,-40.f,-40.f,-40.f,-50.f,-60.f,-70.f,-80.f,-90.f,-100.f}, /*2000*/
Chris@1:    {-40.f,-40.f,-40.f,-40.f,-40.f,-50.f,-60.f,-70.f,-80.f,-90.f,-100.f}, /*2800*/
Chris@1:    {-40.f,-40.f,-40.f,-40.f,-40.f,-50.f,-60.f,-70.f,-80.f,-90.f,-100.f}, /*4000*/
Chris@1: 
Chris@1:    {-30.f,-35.f,-35.f,-40.f,-40.f,-50.f,-60.f,-70.f,-80.f,-90.f,-100.f}, /*5600*/
Chris@1: 
Chris@1:    {-30.f,-30.f,-33.f,-35.f,-40.f,-50.f,-60.f,-70.f,-80.f,-90.f,-100.f}, /*8000*/
Chris@1:    {-30.f,-30.f,-33.f,-35.f,-40.f,-45.f,-50.f,-60.f,-70.f,-85.f,-100.f}, /*11500*/
Chris@1:    {-24.f,-24.f,-26.f,-32.f,-32.f,-42.f,-50.f,-60.f,-70.f,-85.f,-100.f}, /*16000*/
Chris@1: 
Chris@1:   },
Chris@1: 
Chris@1:   1,/* peakattp */
Chris@1:   {{-14.f,-20.f,-20.f,-20.f,-26.f,-32.f,-40.f,-40.f,-40.f,-40.f,-40.f},/*63*/
Chris@1:    {-14.f,-20.f,-20.f,-20.f,-26.f,-32.f,-40.f,-40.f,-40.f,-40.f,-40.f},/*88*/
Chris@1:    {-14.f,-20.f,-20.f,-20.f,-26.f,-32.f,-40.f,-40.f,-40.f,-40.f,-40.f},/*125*/
Chris@1:    {-14.f,-20.f,-20.f,-20.f,-26.f,-32.f,-40.f,-40.f,-40.f,-40.f,-40.f},/*175*/
Chris@1:    {-14.f,-20.f,-20.f,-20.f,-26.f,-32.f,-40.f,-40.f,-40.f,-40.f,-40.f},/*250*/
Chris@1:    {-14.f,-20.f,-20.f,-20.f,-26.f,-32.f,-40.f,-40.f,-40.f,-40.f,-40.f},/*350*/
Chris@1:    {-14.f,-20.f,-20.f,-20.f,-26.f,-32.f,-40.f,-40.f,-40.f,-40.f,-40.f},/*500*/
Chris@1:    {-14.f,-20.f,-20.f,-20.f,-26.f,-32.f,-40.f,-40.f,-40.f,-40.f,-40.f},/*700*/
Chris@1:    {-14.f,-20.f,-20.f,-20.f,-26.f,-32.f,-40.f,-40.f,-40.f,-40.f,-40.f},/*1000*/
Chris@1:    {-14.f,-20.f,-20.f,-20.f,-26.f,-32.f,-40.f,-40.f,-40.f,-40.f,-40.f},/*1400*/
Chris@1:    {-14.f,-20.f,-20.f,-20.f,-26.f,-32.f,-40.f,-40.f,-40.f,-40.f,-40.f},/*2000*/
Chris@1:    {-14.f,-20.f,-20.f,-20.f,-26.f,-32.f,-40.f,-40.f,-40.f,-40.f,-40.f},/*2800*/
Chris@1:    {-14.f,-20.f,-20.f,-20.f,-26.f,-32.f,-40.f,-40.f,-40.f,-40.f,-40.f},/*4000*/
Chris@1:    {-10.f,-12.f,-14.f,-16.f,-16.f,-20.f,-24.f,-30.f,-32.f,-40.f,-40.f},/*5600*/
Chris@1:    {-10.f,-12.f,-14.f,-16.f,-16.f,-20.f,-24.f,-30.f,-32.f,-40.f,-40.f},/*8000*/
Chris@1:    {-10.f,-10.f,-10.f,-12.f,-14.f,-18.f,-22.f,-28.f,-32.f,-40.f,-40.f},/*11500*/
Chris@1:    {-10.f,-10.f,-10.f,-12.f,-14.f,-18.f,-22.f,-28.f,-32.f,-40.f,-40.f},/*16000*/
Chris@1:   },
Chris@1: 
Chris@1:   1,/*noisemaskp */
Chris@1:   -10.f,  /* suppress any noise curve over maxspec+n */
Chris@1:   .5f,   /* low window */
Chris@1:   .5f,   /* high window */
Chris@1:   10,
Chris@1:   10,
Chris@1:   25,
Chris@1:   {.000f, 0.f, /*63*/
Chris@1:    .000f, 0.f, /*88*/
Chris@1:    .000f, 0.f, /*125*/
Chris@1:    .000f, 0.f, /*175*/
Chris@1:    .000f, 0.f, /*250*/
Chris@1:    .000f, 0.f, /*350*/
Chris@1:    .000f, 0.f, /*500*/
Chris@1:    .000f, 0.f, /*700*/
Chris@1:    .000f, 0.f, /*1000*/
Chris@1:    .300f, 0.f, /*1400*/
Chris@1:    .300f, 0.f, /*2000*/
Chris@1:    .300f, 0.f, /*2800*/
Chris@1:    .500f, 0.f, /*4000*/
Chris@1:    .700f, 0.f, /*5600*/
Chris@1:    .850f, 0.f, /*8000*/
Chris@1:    .900f, 0.f, /*11500*/
Chris@1:    .900f, 1.f, /*16000*/
Chris@1:   },
Chris@1:  
Chris@1:   95.f,  /* even decade + 5 is important; saves an rint() later in a
Chris@1:             tight loop) */
Chris@1:   -44.,
Chris@1: 
Chris@1:   32,
Chris@1:   _vp_part0,_vp_couple0
Chris@1: };
Chris@1: 
Chris@1: static vorbis_info_floor1 _floor_set0={1,
Chris@1:                                         {0},
Chris@1:                                         
Chris@1:                                         {32},
Chris@1:                                         {0},
Chris@1:                                         {0},
Chris@1:                                         {{-1}},
Chris@1: 
Chris@1:                                         2,
Chris@1:                                         {0,1024,
Chris@1: 
Chris@1:                                          88,31,243,
Chris@1: 
Chris@1:                                          14,54,143,460,
Chris@1:                                          
Chris@1:                                          6,3,10, 22,18,26, 41,36,47, 
Chris@1:                                          69,61,78, 112,99,126, 185,162,211,  
Chris@1:                                          329,282,387, 672,553,825
Chris@1:                                          },
Chris@1:                                         
Chris@1:                                         60,30,400,
Chris@1:                                         20,8,1,18.,
Chris@1:                                         20,600,
Chris@1:                                         960};
Chris@1: 
Chris@1: 
Chris@1: static vorbis_info_mapping0 mapping_info={1,{0,1},{0},{0},{0},0, 1, {0},{1}};
Chris@1: static codec_setup_info codec_setup0={ {0,0}, 
Chris@1:                                        1,1,1,1,1,0,1,        
Chris@1:                                        {NULL},
Chris@1:                                        {0},{&mapping_info},
Chris@1:                                        {0},{NULL},
Chris@1:                                        {1},{&_floor_set0},
Chris@1:                                        {2},{NULL},
Chris@1:                                        {NULL},
Chris@1:                                        {&_psy_set0},
Chris@1:                                        &_psy_set0G};
Chris@1:                                        
Chris@1: static int noisy=0;
Chris@1: void analysis(char *base,int i,float *v,int n,int bark,int dB){
Chris@1:   if(noisy){
Chris@1:     int j;
Chris@1:     FILE *of;
Chris@1:     char buffer[80];
Chris@1:     sprintf(buffer,"%s_%d.m",base,i);
Chris@1:     of=fopen(buffer,"w");
Chris@1: 
Chris@1:     for(j=0;j<n;j++){
Chris@1:       if(dB && v[j]==0)
Chris@1:           fprintf(of,"\n\n");
Chris@1:       else{
Chris@1:         if(bark)
Chris@1:           fprintf(of,"%g ",toBARK(22050.f*j/n));
Chris@1:         else
Chris@1:           fprintf(of,"%g ",(float)j);
Chris@1:       
Chris@1:         if(dB){
Chris@1:           fprintf(of,"%g\n",todB(v+j));
Chris@1:         }else{
Chris@1:           fprintf(of,"%g\n",v[j]);
Chris@1:         }
Chris@1:       }
Chris@1:     }
Chris@1:     fclose(of);
Chris@1:   }
Chris@1: }
Chris@1: 
Chris@1: long frameno=0;
Chris@1: 
Chris@1: /****************************************************************/
Chris@1: 
Chris@1: int main(int argc,char *argv[]){
Chris@1:   int eos=0;
Chris@1:   float nonz=0.f;
Chris@1:   float acc=0.f;
Chris@1:   float tot=0.f;
Chris@1:   float ampmax=-9999,newmax;
Chris@1:   float local_ampmax[2];
Chris@1: 
Chris@1:   int framesize=2048;
Chris@1:   float ampmax_att_per_sec=-6.;
Chris@1: 
Chris@1:   float *pcm[2],*out[2],*window,*flr[2],*mask[2],*work[2];
Chris@1:   signed char *buffer,*buffer2;
Chris@1:   mdct_lookup m_look;
Chris@1:   drft_lookup f_look;
Chris@1:   vorbis_look_psy p_look;
Chris@1:   vorbis_look_psy_global *pg_look;
Chris@1:   vorbis_look_floor *floor_look;
Chris@1:   vorbis_info vi;
Chris@1:   long i,j,k;
Chris@1: 
Chris@1:   int ath=0;
Chris@1:   int decayp=0;
Chris@1: 
Chris@1:   argv++;
Chris@1:   while(*argv){
Chris@1:     if(*argv[0]=='-'){
Chris@1:       /* option */
Chris@1:       if(argv[0][1]=='v'){
Chris@1:         noisy=0;
Chris@1:       }
Chris@1:     }else
Chris@1:       if(*argv[0]=='+'){
Chris@1:         /* option */
Chris@1:         if(argv[0][1]=='v'){
Chris@1:           noisy=1;
Chris@1:         }
Chris@1:       }else
Chris@1:         framesize=atoi(argv[0]);
Chris@1:     argv++;
Chris@1:   }
Chris@1:   
Chris@1:   vi.channels=2;
Chris@1:   vi.codec_setup=&codec_setup0;
Chris@1: 
Chris@1:   pcm[0]=_ogg_malloc(framesize*sizeof(float));
Chris@1:   pcm[1]=_ogg_malloc(framesize*sizeof(float));
Chris@1:   out[0]=_ogg_calloc(framesize/2,sizeof(float));
Chris@1:   out[1]=_ogg_calloc(framesize/2,sizeof(float));
Chris@1:   work[0]=_ogg_calloc(framesize,sizeof(float));
Chris@1:   work[1]=_ogg_calloc(framesize,sizeof(float));
Chris@1:   flr[0]=_ogg_calloc(framesize/2,sizeof(float));
Chris@1:   flr[1]=_ogg_calloc(framesize/2,sizeof(float));
Chris@1:   buffer=_ogg_malloc(framesize*4);
Chris@1:   buffer2=buffer+framesize*2;
Chris@1:   window=_vorbis_window_create(0,framesize,framesize/2,framesize/2);
Chris@1:   mdct_init(&m_look,framesize);
Chris@1:   drft_init(&f_look,framesize);
Chris@1:   _vp_psy_init(&p_look,&_psy_set0,&_psy_set0G,framesize/2,44100);
Chris@1:   pg_look=_vp_global_look(&vi);
Chris@1:   floor_look=_floor_P[1]->look(NULL,NULL,&_floor_set0);
Chris@1: 
Chris@1:   /* we cheat on the WAV header; we just bypass 44 bytes and never
Chris@1:      verify that it matches 16bit/stereo/44.1kHz. */
Chris@1:   
Chris@1:   fread(buffer,1,44,stdin);
Chris@1:   fwrite(buffer,1,44,stdout);
Chris@1:   memset(buffer,0,framesize*2);
Chris@1: 
Chris@1:   analysis("window",0,window,framesize,0,0);
Chris@1: 
Chris@1:   fprintf(stderr,"Processing for frame size %d...\n",framesize);
Chris@1: 
Chris@1:   while(!eos){
Chris@1:     long bytes=fread(buffer2,1,framesize*2,stdin); 
Chris@1:     if(bytes<framesize*2)
Chris@1:       memset(buffer2+bytes,0,framesize*2-bytes);
Chris@1:     
Chris@1:     if(bytes!=0){
Chris@1:       int nonzero[2];
Chris@1: 
Chris@1:       /* uninterleave samples */
Chris@1:       for(i=0;i<framesize;i++){
Chris@1:         pcm[0][i]=((buffer[i*4+1]<<8)|
Chris@1:                       (0x00ff&(int)buffer[i*4]))/32768.f;
Chris@1:         pcm[1][i]=((buffer[i*4+3]<<8)|
Chris@1:                    (0x00ff&(int)buffer[i*4+2]))/32768.f;
Chris@1:       }
Chris@1:       
Chris@1:       {
Chris@1:         float secs=framesize/44100.;
Chris@1:         
Chris@1:         ampmax+=secs*ampmax_att_per_sec;
Chris@1:         if(ampmax<-9999)ampmax=-9999;
Chris@1:       }
Chris@1: 
Chris@1:       for(i=0;i<2;i++){
Chris@1:         float scale=4.f/framesize;
Chris@1:         float *fft=work[i];
Chris@1:         float *mdct=pcm[i];
Chris@1:         float *logmdct=mdct+framesize/2;
Chris@1: 
Chris@1:         analysis("pre",frameno+i,pcm[i],framesize,0,0);
Chris@1:         
Chris@1:         /* fft and mdct transforms  */
Chris@1:         for(j=0;j<framesize;j++)
Chris@1:           fft[j]=pcm[i][j]*=window[j];
Chris@1:         
Chris@1:         drft_forward(&f_look,fft);
Chris@1: 
Chris@1:         local_ampmax[i]=-9999.f;
Chris@1:         fft[0]*=scale;
Chris@1:         fft[0]=todB(fft);
Chris@1:         for(j=1;j<framesize-1;j+=2){
Chris@1:           float temp=scale*FAST_HYPOT(fft[j],fft[j+1]);
Chris@1:           temp=fft[(j+1)>>1]=todB(&temp);
Chris@1:           if(temp>local_ampmax[i])local_ampmax[i]=temp;
Chris@1:         }
Chris@1:         if(local_ampmax[i]>ampmax)ampmax=local_ampmax[i];
Chris@1:         
Chris@1:         mdct_forward(&m_look,pcm[i],mdct);
Chris@1:         for(j=0;j<framesize/2;j++)
Chris@1:           logmdct[j]=todB(mdct+j);
Chris@1: 
Chris@1:         analysis("mdct",frameno+i,logmdct,framesize/2,1,0);
Chris@1:         analysis("fft",frameno+i,fft,framesize/2,1,0);
Chris@1:       }
Chris@1: 
Chris@1:       for(i=0;i<2;i++){
Chris@1:         float amp;
Chris@1:         float *fft=work[i];
Chris@1:         float *logmax=fft;
Chris@1:         float *mdct=pcm[i];
Chris@1:         float *logmdct=mdct+framesize/2;
Chris@1:         float *mask=fft+framesize/2;
Chris@1: 
Chris@1:         /* floor psychoacoustics */
Chris@1:         _vp_compute_mask(&p_look,
Chris@1:                          pg_look,
Chris@1:                          i,
Chris@1:                          fft,
Chris@1:                          logmdct,
Chris@1:                          mask,
Chris@1:                          ampmax,
Chris@1:                          local_ampmax[i],
Chris@1:                          framesize/2);
Chris@1: 
Chris@1:         analysis("mask",frameno+i,mask,framesize/2,1,0);
Chris@1: 
Chris@1:         {
Chris@1:           vorbis_block vb;
Chris@1:           vorbis_dsp_state vd;
Chris@1:           memset(&vd,0,sizeof(vd));
Chris@1:           vd.vi=&vi;
Chris@1:           vb.vd=&vd;
Chris@1:           vb.pcmend=framesize;
Chris@1: 
Chris@1:           /* floor quantization/application */
Chris@1:           nonzero[i]=_floor_P[1]->forward(&vb,floor_look,
Chris@1:                                           mdct,
Chris@1:                                           logmdct,
Chris@1:                                           mask,
Chris@1:                                           logmax,
Chris@1:                                           
Chris@1:                                           flr[i]);
Chris@1:         }
Chris@1: 
Chris@1:         _vp_remove_floor(&p_look,
Chris@1:                          pg_look,
Chris@1:                          logmdct,
Chris@1:                          mdct,
Chris@1:                          flr[i],
Chris@1:                          pcm[i],
Chris@1:                          local_ampmax[i]);
Chris@1: 
Chris@1:         for(j=0;j<framesize/2;j++)
Chris@1:           if(fabs(pcm[i][j])>1500)
Chris@1:             fprintf(stderr,"%ld ",frameno+i);
Chris@1:         
Chris@1:         analysis("res",frameno+i,pcm[i],framesize/2,1,0);
Chris@1:         analysis("codedflr",frameno+i,flr[i],framesize/2,1,1);
Chris@1:       }
Chris@1: 
Chris@1:       /* residue prequantization */
Chris@1:       _vp_partition_prequant(&p_look,
Chris@1:                              &vi,
Chris@1:                              pcm,
Chris@1:                              nonzero);
Chris@1:         
Chris@1:       for(i=0;i<2;i++)
Chris@1:         analysis("quant",frameno+i,pcm[i],framesize/2,1,0);
Chris@1: 
Chris@1:       /* channel coupling / stereo quantization */
Chris@1: 
Chris@1:       _vp_couple(&p_look,
Chris@1:                  &mapping_info,
Chris@1:                  pcm,
Chris@1:                  nonzero);
Chris@1:   
Chris@1:       for(i=0;i<2;i++)
Chris@1:         analysis("coupled",frameno+i,pcm[i],framesize/2,1,0);
Chris@1: 
Chris@1:       /* decoupling */
Chris@1:       for(i=mapping_info.coupling_steps-1;i>=0;i--){
Chris@1:         float *pcmM=pcm[mapping_info.coupling_mag[i]];
Chris@1:         float *pcmA=pcm[mapping_info.coupling_ang[i]];
Chris@1:         
Chris@1:         for(j=0;j<framesize/2;j++){
Chris@1:           float mag=pcmM[j];
Chris@1:           float ang=pcmA[j];
Chris@1:           
Chris@1:           if(mag>0)
Chris@1:             if(ang>0){
Chris@1:               pcmM[j]=mag;
Chris@1:               pcmA[j]=mag-ang;
Chris@1:             }else{
Chris@1:               pcmA[j]=mag;
Chris@1:               pcmM[j]=mag+ang;
Chris@1:             }
Chris@1:           else
Chris@1:             if(ang>0){
Chris@1:               pcmM[j]=mag;
Chris@1:               pcmA[j]=mag+ang;
Chris@1:             }else{
Chris@1:               pcmA[j]=mag;
Chris@1:               pcmM[j]=mag-ang;
Chris@1:             }
Chris@1:         }
Chris@1:       }
Chris@1:     
Chris@1:       for(i=0;i<2;i++)
Chris@1:         analysis("decoupled",frameno+i,pcm[i],framesize/2,1,0);
Chris@1: 
Chris@1:       for(i=0;i<2;i++){
Chris@1:         float amp;
Chris@1: 
Chris@1:         for(j=0;j<framesize/2;j++)
Chris@1:           pcm[i][j]*=flr[i][j];
Chris@1: 
Chris@1:         analysis("final",frameno+i,pcm[i],framesize/2,1,1);
Chris@1: 
Chris@1:         /* take it back to time */
Chris@1:         mdct_backward(&m_look,pcm[i],pcm[i]);
Chris@1: 
Chris@1:         for(j=0;j<framesize/2;j++)
Chris@1:           out[i][j]+=pcm[i][j]*window[j];
Chris@1: 
Chris@1:         analysis("out",frameno+i,out[i],framesize/2,0,0);
Chris@1: 
Chris@1: 
Chris@1:       }
Chris@1:            
Chris@1:       /* write data.  Use the part of buffer we're about to shift out */
Chris@1:       for(i=0;i<2;i++){
Chris@1:         char  *ptr=buffer+i*2;
Chris@1:         float *mono=out[i];
Chris@1:         int flag=0;
Chris@1:         for(j=0;j<framesize/2;j++){
Chris@1:           int val=mono[j]*32767.;
Chris@1:           /* might as well guard against clipping */
Chris@1:           if(val>32767){
Chris@1:             if(!flag)fprintf(stderr,"clipping in frame %ld ",frameno+i);
Chris@1:             flag=1;
Chris@1:             val=32767;
Chris@1:           }
Chris@1:           if(val<-32768){
Chris@1:             if(!flag)fprintf(stderr,"clipping in frame %ld ",frameno+i);
Chris@1:             flag=1;
Chris@1:             val=-32768;
Chris@1:           }
Chris@1:           ptr[0]=val&0xff;
Chris@1:           ptr[1]=(val>>8)&0xff;
Chris@1:           ptr+=4;
Chris@1:         }
Chris@1:       }
Chris@1:  
Chris@1:       fprintf(stderr,"*");
Chris@1:       fwrite(buffer,1,framesize*2,stdout);
Chris@1:       memmove(buffer,buffer2,framesize*2);
Chris@1: 
Chris@1:       for(i=0;i<2;i++){
Chris@1:         for(j=0,k=framesize/2;j<framesize/2;j++,k++)
Chris@1:           out[i][j]=pcm[i][k]*window[k];
Chris@1:       }
Chris@1:       frameno+=2;
Chris@1:     }else
Chris@1:       eos=1;
Chris@1:   }
Chris@1:   fprintf(stderr,"average raw bits of entropy: %.03g/sample\n",acc/tot);
Chris@1:   fprintf(stderr,"average nonzero samples: %.03g/%d\n",nonz/tot*framesize/2,
Chris@1:           framesize/2);
Chris@1:   fprintf(stderr,"Done\n\n");
Chris@1:   return 0;
Chris@1: }