Adding ability for FIR filter with internal buffer to decimate.

[debian/gnuradio] / gnuradio-core / src / lib / filter / gri_fir_filter_with_buffer_ccf.h

diff --git a/gnuradio-core/src/lib/filter/gri_fir_filter_with_buffer_ccf.h b/gnuradio-core/src/lib/filter/gri_fir_filter_with_buffer_ccf.h
index 2b69f8b036ae9331b8313c2ef16b641f556b11a1..bd7fa33cf6f58424dde25aa1cb23cb5052f7e7da 100644 (file)
--- a/gnuradio-core/src/lib/filter/gri_fir_filter_with_buffer_ccf.h
+++ b/gnuradio-core/src/lib/filter/gri_fir_filter_with_buffer_ccf.h
@@ -69,13 +69,25 @@ public:
   /*!
    * \brief compute a single output value.
    *
-   * \p input must have ntaps() valid entries.
-   * input[0] .. input[ntaps() - 1] are referenced to compute the output value.
+   * \p input is a single input value of the filter type
    *
    * \returns the filtered input value.
    */
   gr_complex filter (gr_complex input);
 
+  
+  /*!
+   * \brief compute a single output value; designed for decimating filters.
+   *
+   * \p input is a single input value of the filter type. The value of dec is the
+   *    decimating value of the filter, so input[] must have dec valid values.
+   *    The filter pushes dec number of items onto the circ. buffer before computing
+   *    a single output.
+   *
+   * \returns the filtered input value.
+   */
+  gr_complex filter (const gr_complex input[], unsigned long dec);
+
   /*!
    * \brief compute an array of N output values.
    *
@@ -93,7 +105,7 @@ public:
    * compute the output values.
    */
   void filterNdec (gr_complex output[], const gr_complex input[],
-                  unsigned long n, unsigned decimate);
+                  unsigned long n, unsigned long decimate);
 
   /*!
    * \brief install \p new_taps as the current taps.