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/* -*- c++ -*- */
/*
* Copyright 2012,2014 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 <gnuradio/io_signature.h>
#include <boost/foreach.hpp>
#include <cstring>
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)
: block("stream_mux",
io_signature::make (1, -1, itemsize),
io_signature::make (1, 1, itemsize)),
d_itemsize(itemsize),
d_stream(0),
d_residual(0),
d_lengths(lengths)
{
while (d_lengths[d_stream] == 0) {
d_stream++;
if (d_stream == d_lengths.size()) {
throw std::invalid_argument("At least one size must be non-zero.");
}
}
d_residual = d_lengths[d_stream];
set_tag_propagation_policy(TPP_DONT);
}
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++) {
// Only active inputs *need* items, for the rest, it would just be nice
ninput_items_required[i] = (d_stream == i ? 1 : 0);
}
}
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; // Items written
gr_vector_int input_index(d_lengths.size(), 0); // Items read
std::vector<gr::tag_t> stream_t;
while (out_index < noutput_items) {
if (ninput_items[d_stream] <= input_index[d_stream]) {
break;
}
int space_left_in_buffers = std::min(
noutput_items - out_index, // Space left in output buffer
ninput_items[d_stream] - input_index[d_stream] // Space left in input buffer
);
int items_to_copy = std::min(
space_left_in_buffers,
d_residual
);
in = (const char *) input_items[d_stream] + input_index[d_stream]*d_itemsize;
memcpy(&out[out_index*d_itemsize], in, items_to_copy*d_itemsize);
get_tags_in_window(stream_t, d_stream,input_index[d_stream],input_index[d_stream] + items_to_copy);
BOOST_FOREACH(gr::tag_t t, stream_t){
t.offset = t.offset - nitems_read(d_stream) - input_index[d_stream] + nitems_written(0) + out_index;
add_item_tag(0, t);
}
out_index += items_to_copy;
input_index[d_stream] += items_to_copy;
d_residual -= items_to_copy;
if (d_residual == 0) {
do { // Skip all those inputs with zero length
d_stream = (d_stream+1) % d_lengths.size();
} while (d_lengths[d_stream] == 0);
d_residual = d_lengths[d_stream];
} else {
break;
}
} // while
for (size_t i = 0; i < input_index.size(); i++) {
consume((int) i, input_index[i]);
}
return out_index;
} /* work */
} /* namespace blocks */
} /* namespace gr */
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