libtsxx, tidofi [FIX]: take return value of filter function

Take the return value in order to allow for a change in number of samples

src/libs/libtsxx/filterbase.cc

@@ -29,11 +29,13 @@
  * REVISIONS and CHANGES 
  *  - 05/07/2005   V1.0   Thomas Forbriger
  *  - 18/12/2007   V1.1   - support debugging
+ *  - 25/02/2019   V1.2   - pass return value to filter, to allow for change
+ *                          in number of samples or sampling interval
  * 
  * ============================================================================
  */
 #define TF_FILTERBASE_CC_VERSION \
-  "TF_FILTERBASE_CC   V1.1"
+  "TF_FILTERBASE_CC   V1.2"
 
 #include <iostream>
 #include <tsxx/filterbase.h>
@@ -46,17 +48,18 @@ namespace ts {
     Ttimeseries FilterCollection::operator()(const Ttimeseries& s,
                                              const bool& debug) const
     {
+      Ttimeseries retval(s);
       Tfilterlist::const_iterator i=this->Tfilterlist::begin();
       while (i!=this->Tfilterlist::end())
       { 
         TSXX_debug(debug, "FilterCollection::operator()",
                    "apply filter" );
-        (*i)->operator()(s, debug); 
+        retval=(*i)->operator()(retval, debug); 
         ++i;
       }
       TSXX_debug(debug, "FilterCollection::operator()",
                  "applied all filters" );
-      return s;
+      return retval;
     }
 
     void Exception::report() const {

src/ts/wf/tidofi.cc

@@ -36,11 +36,14 @@
  *                        - write header data only if supported by output 
  *                          format
  *                        - implemented offset variable tapers
+ *  - 25.02.2019   V1.6   take return value of filter function in order to
+ *                        allow a change of number of samples or sampling
+ *                        interval
  * 
  * ============================================================================
  */
 #define TIDOFI_VERSION \
-  "TIDOFI   V1.5   time domain filter"
+  "TIDOFI   V1.6   time domain filter"
 
 #include <iostream>
 #include <fstream>
@@ -528,7 +531,7 @@ int main(int iargc, char* argv[])
               =prefiltertaper.taper(offset, t0, T);
             taper.apply(series);
           }
-          filter(Ttimeseries(series, wid2.dt), opt.debug);
+          series=filter(Ttimeseries(series, wid2.dt), opt.debug);
           if (applypostfiltertaper)
           {
             // apply post-filter taper
@@ -551,6 +554,7 @@ int main(int iargc, char* argv[])
         {
           if (opt.verbose) { std::cout << " passed unchanged" << std::endl; }
         }
+        wid2.nsamples=series.size();
         os << wid2;
         TFXX_debug(opt.debug, "main", 
                    "  series and WID are written");