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/* -*- c++ -*- */
/*
* Copyright 2007,2010,2012 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gr_delay.h>
#include <gr_io_signature.h>
#include <string.h>
gr_delay_sptr
gr_make_delay (size_t itemsize, int delay)
{
return gnuradio::get_initial_sptr(new gr_delay (itemsize, delay));
}
gr_delay::gr_delay (size_t itemsize, int delay)
: gr_block ("delay",
gr_make_io_signature (1, -1, itemsize),
gr_make_io_signature (1, -1, itemsize)),
d_itemsize(itemsize)
{
set_delay(delay);
d_delta = 0;
}
void
gr_delay::forecast (int noutput_items, gr_vector_int &ninput_items_required)
{
// make sure all inputs have noutput_items available
unsigned ninputs = ninput_items_required.size ();
for (unsigned i = 0; i < ninputs; i++)
ninput_items_required[i] = noutput_items;
}
void
gr_delay::set_delay (int d)
{
// only set a new delta if there is a change in the delay; this
// protects from quickly-repeated calls to this function that would
// end with d_delta=0.
if(d != delay()) {
gruel::scoped_lock l(d_mutex_delay);
int old = delay();
set_history(d+1);
d_delta += delay() - old;
}
}
int
gr_delay::general_work (int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
gruel::scoped_lock l(d_mutex_delay);
assert(input_items.size() == output_items.size());
const char *iptr;
char *optr;
int cons, ret;
// No change in delay; just memcpy ins to outs
if(d_delta == 0) {
for(size_t i = 0; i < input_items.size(); i++) {
iptr = (const char *) input_items[i];
optr = (char *) output_items[i];
std::memcpy(optr, iptr, noutput_items*d_itemsize);
}
cons = noutput_items;
ret = noutput_items;
}
// Skip over d_delta items on the input
else if(d_delta < 0) {
int n_to_copy, n_adj;
int delta = -d_delta;
n_to_copy = std::max(0, noutput_items-delta);
n_adj = std::min(delta, noutput_items);
for(size_t i = 0; i < input_items.size(); i++) {
iptr = (const char *) input_items[i];
optr = (char *) output_items[i];
std::memcpy(optr, iptr+delta*d_itemsize, n_to_copy*d_itemsize);
}
cons = noutput_items;
ret = n_to_copy;
delta -= n_adj;
d_delta = -delta;
}
//produce but not consume (inserts zeros)
else { // d_delta > 0
int n_from_input, n_padding;
n_from_input = std::max(0, noutput_items-d_delta);
n_padding = std::min(d_delta, noutput_items);
for(size_t i = 0; i < input_items.size(); i++) {
iptr = (const char *) input_items[i];
optr = (char *) output_items[i];
std::memset(optr, 0, n_padding*d_itemsize);
std::memcpy(optr, iptr, n_from_input*d_itemsize);
}
cons = n_from_input;
ret = noutput_items;
d_delta -= n_padding;
}
consume_each(cons);
return ret;
}
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