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examples/aubiotrack.c: compute sample accurate beat position

--- a/examples/aubiotrack.c

+++ b/examples/aubiotrack.c

@@ -23,7 +23,7 @@

 uint_t usepitch           = 0;

 fvec_t * out              = NULL;

 aubio_tempo_t * bt        = NULL;

-uint_t istactus           = 0;

+smpl_t istactus           = 0;

 int aubio_process(float **input, float **output, int nframes);

 int aubio_process(float **input, float **output, int nframes) {

@@ -42,8 +42,8 @@

     if (pos == overlap_size-1) {         

       /* block loop */

       aubio_tempo(bt,ibuf,out);

-      if (out->data[0][0]==1) 

-        istactus = 1;

+      if (out->data[0][0]>=1) 

+        istactus = out->data[0][0];

       else 

         istactus = 0;

       if (istactus) {

@@ -64,8 +64,9 @@

 void process_print (void);

 void process_print (void) {

         if (output_filename == NULL) {

-                if (istactus)

-                        outmsg("%f\n",(frames)*overlap_size/(float)samplerate); 

+                if (istactus) {

+                        outmsg("%f\n",((smpl_t)(frames*overlap_size)+(istactus-1.)*overlap_size)/(smpl_t)samplerate); 

+                }

                 if (isonset && verbose)

                         outmsg(" \t \t%f\n",(frames)*overlap_size/(float)samplerate);

         }