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/* -*- c++ -*- */
/*
* Copyright 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 "stream_mux_impl.h"
#include <gr_io_signature.h>
#include <string.h>
#include <cstdio>
#define VERBOSE 0
namespace gr {
namespace blocks {
stream_mux::sptr stream_mux::make(size_t itemsize, const std::vector<int> &lengths)
{
return gnuradio::get_initial_sptr(new stream_mux_impl(itemsize, lengths));
}
stream_mux_impl::stream_mux_impl(size_t itemsize, const std::vector<int> &lengths)
: gr_block("stream_mux",
gr_make_io_signature (1, -1, itemsize),
gr_make_io_signature (1, 1, itemsize)),
d_itemsize(itemsize),
d_stream(0),
d_residual(0),
d_lengths(lengths)
{
if(d_lengths[d_stream] == 0) {
increment_stream();
}
d_residual = d_lengths[d_stream];
}
void
stream_mux_impl::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] = (d_lengths[i] == 0 ? 0 : 1);
}
void
stream_mux_impl::increment_stream()
{
do {
d_stream = (d_stream+1) % d_lengths.size();
} while(d_lengths[d_stream] == 0);
d_residual = d_lengths[d_stream];
}
int
stream_mux_impl::general_work(int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
char *out = (char *) output_items[0];
const char *in;
int out_index = 0;
std::vector<int> input_index(d_lengths.size(), 0);
if(VERBOSE) {
printf("mux: nouput_items: %d d_stream: %d\n", noutput_items, d_stream);
for(size_t i = 0; i < d_lengths.size(); i++)
printf("\tninput_items[%zu]: %d\n", i, ninput_items[i]);
}
while (1) {
int r = std::min(noutput_items - out_index,
std::min(d_residual,
ninput_items[d_stream] - input_index[d_stream]));
if(VERBOSE) {
printf("mux: r=%d\n", r);
printf("\tnoutput_items - out_index: %d\n",
noutput_items - out_index);
printf("\td_residual: %d\n",
d_residual);
printf("\tninput_items[d_stream] - input_index[d_stream]: %d\n",
ninput_items[d_stream] - input_index[d_stream]);
}
if(r <= 0) {
return out_index;
}
in = (const char *) input_items[d_stream] + input_index[d_stream]*d_itemsize;
memcpy(&out[out_index*d_itemsize], in, r*d_itemsize);
out_index += r;
input_index[d_stream] += r;
d_residual -= r;
consume(d_stream, r);
if(d_residual == 0) {
increment_stream();
}
}
}
} /* namespace blocks */
} /* namespace gr */
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