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Diffstat (limited to 'gr-howto-write-a-block/lib/square_ff_impl.cc')
-rw-r--r-- | gr-howto-write-a-block/lib/square_ff_impl.cc | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/gr-howto-write-a-block/lib/square_ff_impl.cc b/gr-howto-write-a-block/lib/square_ff_impl.cc new file mode 100644 index 0000000000..d49f72da1e --- /dev/null +++ b/gr-howto-write-a-block/lib/square_ff_impl.cc @@ -0,0 +1,105 @@ +/* -*- c++ -*- */ +/* + * Copyright 2004,2010,2012 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. + */ + +/* + * config.h is generated by configure. It contains the results + * of probing for features, options etc. It should be the first + * file included in your .cc file. + */ +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include "square_ff_impl.h" +#include <gr_io_signature.h> + +namespace gr { + namespace howto { + + /* + * Create a new instance of howto_square_ff and return a boost + * shared_ptr. This is effectively the public constructor. + */ + square_ff::sptr + square_ff::make() + { + return gnuradio::get_initial_sptr + (new square_ff_impl()); + } + + /* + * Specify constraints on number of input and output streams. + * This info is used to construct the input and output signatures + * (2nd & 3rd args to gr_block's constructor). The input and + * output signatures are used by the runtime system to + * check that a valid number and type of inputs and outputs + * are connected to this block. In this case, we accept + * only 1 input and 1 output. + */ + static const int MIN_IN = 1; // mininum number of input streams + static const int MAX_IN = 1; // maximum number of input streams + static const int MIN_OUT = 1; // minimum number of output streams + static const int MAX_OUT = 1; // maximum number of output streams + + /* + * The private constructor + */ + square_ff_impl::square_ff_impl() + : gr_block("square_ff", + gr_make_io_signature(MIN_IN, MAX_IN, sizeof(float)), + gr_make_io_signature(MIN_OUT, MAX_OUT, sizeof(float))) + { + // nothing else required in this example + } + + /* + * Our virtual destructor. + */ + square_ff_impl::~square_ff_impl() + { + // nothing else required in this example + } + + int + square_ff_impl::general_work(int noutput_items, + gr_vector_int &ninput_items, + gr_vector_const_void_star &input_items, + gr_vector_void_star &output_items) + { + const float *in = (const float*)input_items[0]; + float *out = (float*)output_items[0]; + + for(int i = 0; i < noutput_items; i++) { + out[i] = in[i] * in[i]; + } + + // Tell runtime system how many input items we consumed on + // each input stream. + + consume_each(noutput_items); + + // Tell runtime system how many output items we produced. + return noutput_items; + } + + } /* namespace howto */ +} /* namespace gr */ |