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| author | Johnathan Corgan <johnathan@corganlabs.com> | 2013-03-27 20:41:40 -0700 |
|---|---|---|
| committer | Johnathan Corgan <johnathan@corganlabs.com> | 2013-03-27 20:41:40 -0700 |
| commit | 2caaabf8e1dd771174fd42e51c8c8090864638e6 (patch) | |
| tree | e58fe2bc53120acfd11aa6687fe5fa0aaa58ca71 /gnuradio-runtime/lib/gr_sync_decimator.cc | |
| parent | 40ab0030dbe821c9ed475a0b73898040f4af581c (diff) | |
| parent | d7cde125dc3661a62e1013a4a017f0f1efa46e6e (diff) | |
Merge branch 'runtime-3.7' into next
Diffstat (limited to 'gnuradio-runtime/lib/gr_sync_decimator.cc')
| -rw-r--r-- | gnuradio-runtime/lib/gr_sync_decimator.cc | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/gnuradio-runtime/lib/gr_sync_decimator.cc b/gnuradio-runtime/lib/gr_sync_decimator.cc new file mode 100644 index 0000000000..a0f907db53 --- /dev/null +++ b/gnuradio-runtime/lib/gr_sync_decimator.cc @@ -0,0 +1,69 @@ +/* -*- c++ -*- */ +/* + * Copyright 2004 Free Software Foundation, Inc. + * + * This file is part of GNU Radio + * + * GNU Radio is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3, or (at your option) + * any later version. + * + * GNU Radio is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GNU Radio; see the file COPYING. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, + * Boston, MA 02110-1301, USA. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <gr_sync_decimator.h> + +gr_sync_decimator::gr_sync_decimator (const std::string &name, + gr_io_signature_sptr input_signature, + gr_io_signature_sptr output_signature, + unsigned decimation) + : gr_sync_block (name, input_signature, output_signature) +{ + set_decimation (decimation); +} + +void +gr_sync_decimator::forecast (int noutput_items, gr_vector_int &ninput_items_required) +{ + unsigned ninputs = ninput_items_required.size (); + for (unsigned i = 0; i < ninputs; i++) + ninput_items_required[i] = fixed_rate_noutput_to_ninput(noutput_items); +} + +int +gr_sync_decimator::fixed_rate_noutput_to_ninput(int noutput_items) +{ + return noutput_items * decimation() + history() - 1; +} + +int +gr_sync_decimator::fixed_rate_ninput_to_noutput(int ninput_items) +{ + return std::max(0, ninput_items - (int)history() + 1) / decimation(); +} + +int +gr_sync_decimator::general_work (int noutput_items, + gr_vector_int &ninput_items, + gr_vector_const_void_star &input_items, + gr_vector_void_star &output_items) +{ + int r = work (noutput_items, input_items, output_items); + if (r > 0) + consume_each (r * decimation ()); + return r; +} + |